Probabilistic analysis of the DoB in axially-loaded tubular KT-joints of offshore structures

Article

Ahmadi, Hamid. 2019. "Probabilistic analysis of the DoB in axially-loaded tubular KT-joints of offshore structures." Applied Ocean Research. 87, pp. 64-80. https://doi.org/10.1016/j.apor.2019.03.018
Article Title

Probabilistic analysis of the DoB in axially-loaded tubular KT-joints of offshore structures

ERA Journal ID22096
Article CategoryArticle
Authors
AuthorAhmadi, Hamid
Journal TitleApplied Ocean Research
Journal Citation87, pp. 64-80
Number of Pages17
Year2019
PublisherElsevier
Place of PublicationUnited Kingdom
ISSN0141-1187
1879-1549
Digital Object Identifier (DOI)https://doi.org/10.1016/j.apor.2019.03.018
Web Address (URL)https://www.sciencedirect.com/science/article/pii/S0141118718308952
Abstract

The degree of bending (DoB) characterizing the through-the-thickness stress distribution has a profound effect on the fatigue behavior of tubular joints commonly found in steel offshore structures and the determination of DoB values is essential for improving the accuracy of fatigue life estimation. Probability density functions of the involved random variables are necessary for the fatigue reliability analysis of offshore structures. The objective of present research was the derivation of probability density function (PDF) for the DoB in tubular KT-joints commonly found in jacket-type offshore platforms. A total of 162 finite element (FE) analyses were carried out on 81 FE models of KT-joints subjected to two types of axial loading. Generated FE models were validated using experimental data, previous FE results, and available parametric equations. Based on the results of parametric FE study, a sample database was prepared for the DoB values and density histograms were generated for respective samples based on the Freedman-Diaconis rule. Thirteen theoretical PDFs were fitted to the developed histograms and the maximum likelihood (ML) method was applied to evaluate the parameters of fitted PDFs. In each case, the Kolmogorov-Smirnov test was used to evaluate the goodness of fit. Finally, the Generalized Extreme Value model was proposed as the governing probability distribution function for the DoB. After substituting the values of estimated parameters, six fully defined PDFs were presented for the DoB in tubular KT-joints subjected to two types of axial loading.

KeywordsTubular KT-joint, Fatigue, Degree of bending (DoB), Axial loading, Probability density function (PDF), Generalized Extreme Value model, Kolmogorov-Smirnov test
ANZSRC Field of Research 2020401504. Ship and platform structures (incl. maritime hydrodynamics)
400510. Structural engineering
Public Notes

Files associated with this item cannot be displayed due to copyright restrictions.

Byline AffiliationsUniversity of Tabriz, Iran
Institution of OriginUniversity of Southern Queensland
Permalink -

https://research.usq.edu.au/item/q7921/probabilistic-analysis-of-the-dob-in-axially-loaded-tubular-kt-joints-of-offshore-structures

Log in to edit
  • 41
    total views
  • 2
    total downloads
  • 1
    views this month
  • 0
    downloads this month

Export as

Related outputs

Stress concentration factors for multi-planar tubular KK-joints of jacket substructures in offshore wind turbines
Ahmadi, Hamid and Alizadeh Atalo, Adel Alizadeh. 2024. "Stress concentration factors for multi-planar tubular KK-joints of jacket substructures in offshore wind turbines ." Ocean Systems Engineering. 14 (3), pp. 237-259.
Stress concentration factors (SCFs) for multi-planar tubular KK-joints of jacket substructures in offshore wind turbines (OWTs)
Ahmadi, Hamid, Karampour, Hassan and Atalo, Adel Alizadeh. 2024. "Stress concentration factors (SCFs) for multi-planar tubular KK-joints of jacket substructures in offshore wind turbines (OWTs)." 34th International Ocean and Polar Engineering Conference. Rhodes, Greece 16 - 21 Jun 2024 United States.
Performance Assessment of GFRP Composites as a Sustainable Replacement of Steel in Marine Environment for the Construction of Aid-to-Navigation Structures
Ahmadi, H., Manalo, A., Seligmann, H., Shrestha, I., Madhu, A., Sundholm, K., Giufre, T. and Mohammed, A.. 2024. "Performance Assessment of GFRP Composites as a Sustainable Replacement of Steel in Marine Environment for the Construction of Aid-to-Navigation Structures." Ninth Asia-Pacific Conference on FRP in Structures (APFIS 2024). Adelaide, Australia 08 - 11 Dec 2024 Australia.
Linear and nonlinear axial behaviour of internal replacement pipe systems for pipeline rehabilitation
Ahmadi, Hamid, Salah, Ahmad, Manalo, Allan, Dixon, Patrick G., Karunasena, Warna, Karunasena, Warna, Tien, Cam Minh Tri, Kiriella, Shanika, O’Rourke, Thomas D. and Wham, Brad P.. 2024. "Linear and nonlinear axial behaviour of internal replacement pipe systems for pipeline rehabilitation." Structure and Infrastructure Engineering: maintenance, management, life-cycle design and performance. https://doi.org/10.1080/15732479.2024.2356673
Temperature change-induced linear and nonlinear axial responses of internal replacement pipe (IRP) systems for pipeline rehabilitation incorporating the effects of soil friction
Ahmadi, Hamid, Manalo, Allan, Dixon, Patrick G., Salah, Ahmad, Karunasena, Warna, Tien, Cam Minh Tri, Kiriella, Shanika, O’Rourke, Thomas D. and Wham, Brad P.. 2024. "Temperature change-induced linear and nonlinear axial responses of internal replacement pipe (IRP) systems for pipeline rehabilitation incorporating the effects of soil friction." Structures. 62. https://doi.org/10.1016/j.istruc.2024.106247
Bending fatigue behaviour of internal replacement pipe systems
Kiriella, Shanika, Manalo, Allan, Tien, Cam Minh Tri, Ahmadi, Hamid, Dixon, Patrick G., Karunasena, Warna, Salah, Ahmad and Wham, Brad P.. 2024. "Bending fatigue behaviour of internal replacement pipe systems." Composite Structures. 331. https://doi.org/10.1016/j.compstruct.2024.117910
Geometrical effects on the local joint flexibility of three-planar tubular Y-joints in substructures of offshore wind turbines
Ahmadi, Hamid and Akbari Niri, Ata. 2024. "Geometrical effects on the local joint flexibility of three-planar tubular Y-joints in substructures of offshore wind turbines." Ships and Offshore Structures. 19 (4), pp. 484-496. https://doi.org/10.1080/17445302.2023.2179213
A simplified theoretical prediction of lateral deformation behaviour of structural pipe repair systems
Kiriella, Shanika, Manalo, Allan, Tien, , Cam Minh Tri, Karunasena, Warna, Ahmadi, Hamid, Salah, Ahmad, Dixon, Patrick, Wham, Brad P. and O'Rourke, Thomas D.. 2023. "A simplified theoretical prediction of lateral deformation behaviour of structural pipe repair systems." No-Dig Down Under 2023 Conference. Brisbane, Australia 12 - 14 Sep 2023 Australia.
Effects of the legacy pipe ends on the behaviour of pipe-in-pipe repair systems under internal pressure
Tien, C.M.T., Manalo, A., Dixon, P., Tafsirojjaman, T., Karunasena, W., Flood, W.W., Ahmadi, H., Kiriella, S., Salah, A. and Wham, B.P.. 2023. "Effects of the legacy pipe ends on the behaviour of pipe-in-pipe repair systems under internal pressure." Engineering Failure Analysis. 144. https://doi.org/10.1016/j.engfailanal.2022.106957
Lateral deformation behaviour of structural internal replacement pipe repair systems
Kiriella, Shanika, Manalo, Allan, Tien, Cam Minh Tri, Ahmadi, Hamid, Wham, Brad P., Salah, Ahmad, Tafsirojjaman, T., Karunasena, Warna, Dixon, Patrick and O'Rourke, Thomas D.. 2023. "Lateral deformation behaviour of structural internal replacement pipe repair systems." Composite Structures. 319, p. 117144. https://doi.org/10.1016/j.compstruct.2023.117144
An Analytical Approach for Thermally Induced Axial Deformation in Rehabilitated Pipelines
Dixon, Patrick G., Salah, Ahmad, Ahmadi, Hamid, Ulrich, Morgan E., Hubler, Mija H., Dashti, Shideh, O’Rourke, Thomas D., Manalo, A. and Wham, Brad P.. 2023. "An Analytical Approach for Thermally Induced Axial Deformation in Rehabilitated Pipelines." Pipelines 2023: Construction and Rehabilitation. San Antonio, TX, United States. 12 - 16 Aug 2023 United States. https://doi.org/10.1061/9780784485026.028
A Study on the Degree of Bending (DoB) in Two-Planar Tubular DYT-Joints of Offshore Jacket Structures: Geometrical Effects and Fatigue Design Formulation
Ahmadi, Hamid, Karampour, Hassan, Ghorbani, Mahdi and Fard, Hamid. 2023. "A Study on the Degree of Bending (DoB) in Two-Planar Tubular DYT-Joints of Offshore Jacket Structures: Geometrical Effects and Fatigue Design Formulation." ASME 2023 42nd International Conference on Ocean, Offshore and Arctic Engineering (OMAE2023). Melbourne, Australia 11 - 16 Jun 2023 Australia. https://doi.org/10.1115/OMAE2023-100940
Effects of geometrical parameters on the degree of bending in two-planar tubular DYT-joints of offshore jacket structures
Ahmadi, Hamid and Ghorbani, Mahdi. 2023. "Effects of geometrical parameters on the degree of bending in two-planar tubular DYT-joints of offshore jacket structures." Ocean Systems Engineering. 13 (2), pp. 97-121. https://doi.org/10.12989/ose.2023.13.2.097
SCFs in multi-planar tubular TT-joints of offshore jacket structures subjected to out-of plane bending (OPB) loads
Ahmadi, Hamid and Imani, Hossein. 2022. "SCFs in multi-planar tubular TT-joints of offshore jacket structures subjected to out-of plane bending (OPB) loads." Journal of Civil and Environmental Engineering. https://doi.org/10.22034/JCEE.2022.50514.2122
Effects of floating wave barriers on wave-induced forces exerted to offshore-jacket structure
Osgouei, Arash Dalili, Poursorkhabi, Ramin Vafaei, Hosseini, Hamed, Qader, Diyar N., Maleki, Ahmad and Ahmadi, Hamid. 2022. "Effects of floating wave barriers on wave-induced forces exerted to offshore-jacket structure." Structural Engineering and Mechanics. 83 (1), pp. 53-66. https://doi.org/10.12989/sem.2022.83.1.053
SCFs in offshore two-planar tubular TT-joints reinforced with internal ring stiffeners
Ahmadi, Hamid and Imani, Hossein. 2022. "SCFs in offshore two-planar tubular TT-joints reinforced with internal ring stiffeners." Ocean Systems Engineering. 12 (1), pp. 1-22. https://doi.org/10.12989/ose.2022.12.1.001
SCF distribution along the weld toe in tubular X-joints reinforced with doubler plates subjected to axial loading: Study of geometrical effects and design formulation
Ahmadi, Hamid and Khavaninzadeh, Mohammad Hasan. 2021. "SCF distribution along the weld toe in tubular X-joints reinforced with doubler plates subjected to axial loading: Study of geometrical effects and design formulation." Journal of Civil and Environmental Engineering. https://doi.org/10.22034/JCEE.2021.48015.2073
Probability density functions of the DoB in tubular KT-joints of jacket-type platforms under out-of-plane bending loads
Ahmadi, Hamid, Zavvar, Esmaeil and Mayeli, Vahid. 2024. "Probability density functions of the DoB in tubular KT-joints of jacket-type platforms under out-of-plane bending loads." International Journal of Coastal, Offshore & Environmental Engineering. https://doi.org/10.22034/IJCOE.2024.341041.0
Parametric study and formulation of SCFs in axially loaded multi-planar tubular XT-joints reinforced with internal ring stiffeners
Ahmadi, Hamid and Kouhi, Ahmad. 2024. "Parametric study and formulation of SCFs in axially loaded multi-planar tubular XT-joints reinforced with internal ring stiffeners." Journal of Civil and Environmental Engineering. 54 (1), pp. 152-167. https://doi.org/10.22034/JCEE.2021.42052.1968
Derivation of the Probability Density Functions for the Local Joint Flexibility Factors in Axially Loaded Two-Planar Tubular DK-Joints of Offshore Structures
Ahmadi, Hamid and Mayeli, Vahid. 2023. "Derivation of the Probability Density Functions for the Local Joint Flexibility Factors in Axially Loaded Two-Planar Tubular DK-Joints of Offshore Structures." Journal of Civil and Environmental Engineering. 53 (1), pp. 161-174. https://doi.org/10.22034/CEEJ.2023.33431.1788
Stress concentration analysis of internally ring-stiffened two-planar tubular KK-joints
Ahmadi, Hamid, Alinezhad, Rasoul and Atalo, Adel Alizadeh. 2022. "Stress concentration analysis of internally ring-stiffened two-planar tubular KK-joints." Ships and Offshore Structures. 17 (10), pp. 2203-2217. https://doi.org/10.1080/17445302.2021.1979922
Effects of a floating wave barrier with square cross section on the wave-induced forces exerted to an offshore jacket structure
Osgouei, Arash Dalili, Poursorkhabi, Ramin Vafaei, Maleki, Ahmad and Ahmadi, Hamid. 2021. "Effects of a floating wave barrier with square cross section on the wave-induced forces exerted to an offshore jacket structure." Ocean Systems Engineering. 11 (3), pp. 259-274. https://doi.org/10.12989/ose.2021.11.3.259
Local joint flexibility of multi-planar tubular TT-joints: Study of geometrical effects and the formulation for offshore design practice
Ahmadi, Hamid and Janfeshan, Navid Mohammadpourian. 2021. "Local joint flexibility of multi-planar tubular TT-joints: Study of geometrical effects and the formulation for offshore design practice." Applied Ocean Research. 113, pp. 1-11. https://doi.org/10.1016/j.apor.2021.102758
Effects of geometrical parameters on the local joint flexibility (LJF) of three-planar tubular T-joints in offshore structures
Ahmadi, Hamid and Akhtegan, Mohammad. 2022. "Effects of geometrical parameters on the local joint flexibility (LJF) of three-planar tubular T-joints in offshore structures." Ships and Offshore Structures. 17 (7), pp. 1604-1615. https://doi.org/10.1080/17445302.2021.1937794
Geometrical effects on the degree of bending (DoB) of multi-planar tubular KK-joints in jacket substructure of offshore wind turbines
Ahmadi, Hamid and Atalo, Adel Alizadeh. 2021. "Geometrical effects on the degree of bending (DoB) of multi-planar tubular KK-joints in jacket substructure of offshore wind turbines." Applied Ocean Research. 111, pp. 1-14. https://doi.org/10.1016/j.apor.2021.102678
Experimental and numerical study of the ultimate load for collar-plate-reinforced tubular K-joints at fire-induced elevated temperatures
Azari-Dodaran, Neda, Ahmadi, Hamid, Zhu, Lie and Li, Peiyang. 2022. "Experimental and numerical study of the ultimate load for collar-plate-reinforced tubular K-joints at fire-induced elevated temperatures." Ships and Offshore Structures. 17 (5), pp. 1159-1177. https://doi.org/10.1080/17445302.2021.1897221
Fire resistance of collar-plate-reinforced multi-planar tubular KK-joints: experimental and numerical study for the design formulation
Azari-Dodaran, Neda and Ahmadi, Hamid. 2022. "Fire resistance of collar-plate-reinforced multi-planar tubular KK-joints: experimental and numerical study for the design formulation." Ships and Offshore Structures. 17 (6), pp. 1190-1208. https://doi.org/10.1080/17445302.2021.1897233
Numerical study on the ultimate load of offshore two-planar tubular KK-joints at fire-induced elevated temperatures
Azari-Dodaran, Neda and Ahmadi, Hamid. 2022. "Numerical study on the ultimate load of offshore two-planar tubular KK-joints at fire-induced elevated temperatures." Journal of Marine Engineering and Technology. 21 (4), pp. 205-223. https://doi.org/10.1080/20464177.2020.1827488
Local Buckling Analysis of Cold‑Formed Steel Webs with Rectangular Openings
Osgouei, Amir Jameei, Hosseinzadeh, Yousef and Ahmadi, Hamid. 2020. "Local Buckling Analysis of Cold‑Formed Steel Webs with Rectangular Openings." Iranian Journal of Science and Technology: Transactions of Civil Engineering. 44 (Suppl 1), pp. 67-78. https://doi.org/10.1007/s40996-020-00451-4
A Probability Distribution Model for the Degree of Bending In Tubular KT-Joints of Offshore Jacket-Type Platforms Subjected To IPB Moment Loadings
Ahmadi, Hamid, Mayeli, Vahid and Zavvar, Esmaeil. 2019. "A Probability Distribution Model for the Degree of Bending In Tubular KT-Joints of Offshore Jacket-Type Platforms Subjected To IPB Moment Loadings." International Journal of Coastal and Offshore Engineering. 3 (2), pp. 11-29. https://doi.org/10.29252/IJCOE.3.2.11
Structural behavior of right-angle two-planar tubular TT-joints subjected to axial loadings at fire-induced elevated temperatures
Azari-Dodaran, Neda and Ahmadi, Hamid. 2019. "Structural behavior of right-angle two-planar tubular TT-joints subjected to axial loadings at fire-induced elevated temperatures." Fire Safety Journal. 108, pp. 1-15. https://doi.org/10.1016/j.firesaf.2019.102849
Static behavior of offshore two-planar tubular KT-joints under axial loading at fire-induced elevated temperatures
Azari-Dodaran, Neda and Ahmadi, Hamid. 2019. "Static behavior of offshore two-planar tubular KT-joints under axial loading at fire-induced elevated temperatures." Journal of Ocean Engineering and Science. 4 (4), pp. 352-372. https://doi.org/10.1016/j.joes.2019.05.009
Effects of geometrical parameters on the degree of bending (DoB) in two-planar tubular DT-joints of offshore jacket structures subjected to axial and bending loads
Ahmadi, Hamid and Niaki, Masoud Amini. 2019. "Effects of geometrical parameters on the degree of bending (DoB) in two-planar tubular DT-joints of offshore jacket structures subjected to axial and bending loads." Marine Structures. 64, pp. 229-245. https://doi.org/10.1016/j.marstruc.2018.11.008
Development of a probability distribution model for the LJF factors in offshore two-planar tubular DK-joints subjected to OPB moment loading
Ahmadi, Hamid and Mayeli, Vahid. 2019. "Development of a probability distribution model for the LJF factors in offshore two-planar tubular DK-joints subjected to OPB moment loading." Marine Structures. 63, pp. 196-214. https://doi.org/10.1016/j.marstruc.2018.09.009
Static strength of axially loaded tubular KT-joints at elevated temperatures: Study of geometrical effects and parametric formulation
Dodaran, Neda Azari, Ahmadi, Hamid and Lotfollahi-Yaghin, Mohammad Ali. 2018. "Static strength of axially loaded tubular KT-joints at elevated temperatures: Study of geometrical effects and parametric formulation." Marine Structures. 61, pp. 282-308. https://doi.org/10.1016/j.marstruc.2018.06.009
Development of a Probability Distribution Model for SCFs in Uniplanar Tubular KT-Joints of Offshore Structures under IPB Moment Loading
Ahmadi, Hamid and Benam, Mir Amin Mousavi Nezhad. 2017. "Development of a Probability Distribution Model for SCFs in Uniplanar Tubular KT-Joints of Offshore Structures under IPB Moment Loading." International Journal of Coastal and Offshore Engineering. 1 (3), pp. 1-18.
A numerical study on the ultimate load of offshore two-planar tubular TT-joints reinforced with internal ring stiffeners at fire-induced elevated temperatures
Azari-Dodaran, Neda and Ahmadi, Hamid. 2021. "A numerical study on the ultimate load of offshore two-planar tubular TT-joints reinforced with internal ring stiffeners at fire-induced elevated temperatures." Ocean Engineering. 230, pp. 1-15. https://doi.org/10.1016/j.oceaneng.2021.108797
Stress concentration factors in FRP-strengthened steel tubular KT-joints
Hosseini, Alireza Sadat, Zavvar, Esmaeil and Ahmadi, Hamid. 2021. "Stress concentration factors in FRP-strengthened steel tubular KT-joints." Applied Ocean Research. 108, pp. 1-24. https://doi.org/10.1016/j.apor.2021.102525
Effects of geometrical parameters on the degree of bending (DoB) in multiplanar tubular XT-joints of offshore structures subjected to axial loading
Ahmadi, Hamid, Chamani, Shadi and Kouhi, Ahmad. 2020. "Effects of geometrical parameters on the degree of bending (DoB) in multiplanar tubular XT-joints of offshore structures subjected to axial loading." Applied Ocean Research. 104. https://doi.org/10.1016/j.apor.2020.102381
Stress concentration factors of multi-planar tubular XT-joints subjected to out-of-plane bending moments
Ahmadi, Hamid and Kouhi, Ahmad. 2020. "Stress concentration factors of multi-planar tubular XT-joints subjected to out-of-plane bending moments." Applied Ocean Research. 96, pp. 1-11. https://doi.org/10.1016/j.apor.2020.102058
Degree of bending (DoB) in offshore tubular KT-joints under the axial, in-plane bending (IPB), and out-of-plane bending (OPB) loads
Ahmadi, Hamid and Zavvar, Esmaeil. 2020. "Degree of bending (DoB) in offshore tubular KT-joints under the axial, in-plane bending (IPB), and out-of-plane bending (OPB) loads." Applied Ocean Research. 95, pp. 1-19. https://doi.org/10.1016/j.apor.2019.102015
Local buckling analysis of cold-formed steel webs with stiffened rectangular openings
Osgouei, Amir Jameei, Hosseinzadeh, Yousef and Ahmadi, Hamid. 2020. "Local buckling analysis of cold-formed steel webs with stiffened rectangular openings." Journal of Constructional Steel Research. 167, pp. 1-16. https://doi.org/10.1016/j.jcsr.2019.105824
Parametric study on structural behavior of tubular K-joints under axial loading at fire-induced elevated temperatures
Dodaran, Neda Azari, Ahmadi, Hamid and Lotfollahi-Yaghin, Mohammad Ali. 2018. "Parametric study on structural behavior of tubular K-joints under axial loading at fire-induced elevated temperatures." Thin-Walled Structures. 130, pp. 467-486. https://doi.org/10.1016/j.tws.2018.06.014
Probabilistic analysis of the local joint flexibility in two-planar tubular DK-joints of offshore jacket structures under in-plane bending loads
Ahmadi, Hamid and Mayeli, Vahid. 2018. "Probabilistic analysis of the local joint flexibility in two-planar tubular DK-joints of offshore jacket structures under in-plane bending loads." Applied Ocean Research. 81, pp. 126-140. https://doi.org/10.1016/j.apor.2018.10.011
Static capacity of tubular X-joints reinforced with collar plate subjected to brace compression
Nassiraei, Hossein, Zhu, Lie, Lotfollahi-Yaghin, Mohammad Ali and Ahmadi, Hamid. 2017. "Static capacity of tubular X-joints reinforced with collar plate subjected to brace compression." Thin-Walled Structures. 119, pp. 256-265. https://doi.org/10.1016/j.tws.2017.06.012
Static strength of doubler plate reinforced tubular T/Y-joints under in-plane bending load
Nassiraei, Hossein, Lotfollahi-Yaghin, Mohammad Ali, Ahmadi, Hamid and Zhu, Lie. 2017. "Static strength of doubler plate reinforced tubular T/Y-joints under in-plane bending load." Journal of Constructional Steel Research. 136, pp. 49-64. https://doi.org/10.1016/j.jcsr.2017.05.009
Local joint flexibility of two-planar tubular DK-joints in OWTs subjected to axial loading: Parametric study of geometrical effects and design formulation
Ahmadi, Hamid and Nejad, Ali Ziaei. 2017. "Local joint flexibility of two-planar tubular DK-joints in OWTs subjected to axial loading: Parametric study of geometrical effects and design formulation." Ocean Engineering. 136, pp. 1-10. https://doi.org/10.1016/j.oceaneng.2017.03.011
A study on the Local Joint Flexibility (LJF) of two-planar tubular DK-joints in jacket structures under in-plane bending loads
Ahmadi, Hamid and Nejad, Ali Ziaei. 2017. "A study on the Local Joint Flexibility (LJF) of two-planar tubular DK-joints in jacket structures under in-plane bending loads." Applied Ocean Research. 64, pp. 1-14. https://doi.org/10.1016/j.apor.2017.02.002
Geometrical effects on the local joint flexibility of two-planar tubular DK-joints in jacket substructure of offshore wind turbines under OPB loading
Ahmadi, Hamid and Nejad, Ali Ziaei. 2017. "Geometrical effects on the local joint flexibility of two-planar tubular DK-joints in jacket substructure of offshore wind turbines under OPB loading." Thin-Walled Structures. 114 (5), pp. 122-133. https://doi.org/10.1016/j.tws.2017.02.001
Investigation on the Effect of Geometrical and Geotechnical Parameters on Elongated Offshore Piles Using Fuzzy Inference Systems
Aminfar, Ali, Mojtahedi, Alireza, Ahmadi, Hamid and Aminfar, Mohammad Hossein. 2017. "Investigation on the Effect of Geometrical and Geotechnical Parameters on Elongated Offshore Piles Using Fuzzy Inference Systems." China Ocean Engineering. 31 (3), pp. 378-388. https://doi.org/10.1007/s13344-017-0044-z
Probabilistic analysis of stress concentration factors in unstiffened gap tubular KT-joints of jacket structures under the out-of-plane bending moment loads
Ahmadi, Hamid and Benam, Mir Amin Mousavi Nezhad. 2017. "Probabilistic analysis of stress concentration factors in unstiffened gap tubular KT-joints of jacket structures under the out-of-plane bending moment loads." Advances in Structural Engineering: an international journal. 20 (4), pp. 595-615. https://doi.org/10.1177/1369433216658487
Seismic responses of an offshore jacket-type platform incorporated with tuned liquid dampers
Lotfollahi-Yaghin, Mohammad Ali, Ahmadi, Hamid and Tafakhor, Hassan. 2016. "Seismic responses of an offshore jacket-type platform incorporated with tuned liquid dampers." Advances in Structural Engineering: an international journal. 19 (2), pp. 227-238. https://doi.org/10.1177/1369433215624340
Cyclic Behavior of Cold-Formed Steel Frames with Strap Bracing
Hosseinzadeh, Y., Moslehifar, A. and Ahmadi, H.. 2017. "Cyclic Behavior of Cold-Formed Steel Frames with Strap Bracing." Asian Journal of Civil Engineering. 18 (2), pp. 150-161.
Static performance of doubler plate reinforced tubular T/Y-joints subjected to brace tension
Nassiraei, Hossein, Lotfollahi-Yaghin, Mohammad Ali and Ahmadi, Hamid. 2016. "Static performance of doubler plate reinforced tubular T/Y-joints subjected to brace tension." Thin-Walled Structures. 108, pp. 138-152. https://doi.org/10.1016/j.tws.2016.08.012
Stress concentration factors in uniplanar tubular KT-joints of jacket structures subjected to in-plane bending loads
Ahmadi, Hamid and Nejad, Ali Ziyaei. 2016. "Stress concentration factors in uniplanar tubular KT-joints of jacket structures subjected to in-plane bending loads." International Journal of Maritime Technology. 5, pp. 27-39.
Static strength of doubler plate reinforced tubular T/Y-joints subjected to brace compressive loading: Study of geometrical effects and parametric formulation
Nassiraei, Hossein, Lotfollahi-Yaghin, Mohammad Ali and Ahmadi, Hamid. 2016. "Static strength of doubler plate reinforced tubular T/Y-joints subjected to brace compressive loading: Study of geometrical effects and parametric formulation." Thin-Walled Structures. 107, pp. 231-247. https://doi.org/10.1016/j.tws.2016.06.009
Structural behavior of tubular T/Y-joints with collar plate under static in-plane bending
Nassiraei, Hossein, Lotfollahi-Yaghin, Mohammad Ali and Ahmadi, Hamid. 2016. "Structural behavior of tubular T/Y-joints with collar plate under static in-plane bending." Journal of Constructional Steel Research. 123, pp. 121-134. https://doi.org/10.1016/j.jcsr.2016.04.029
The effect of multi-planarity on the SCFs in offshore tubular KT-joints subjected to in-plane and out-of-plane bending loads
Ahmadi, Hamid and Zavvar, Esmaeil. 2016. "The effect of multi-planarity on the SCFs in offshore tubular KT-joints subjected to in-plane and out-of-plane bending loads." Thin-Walled Structures. 106, pp. 148-165. https://doi.org/10.1016/j.tws.2016.04.020
Parametric study of geometrical effects on the degree of bending (DoB) in offshore tubular K-joints under out-of-plane bending loads
Ahmadi, Hamid and Asoodeh, Shadi. 2016. "Parametric study of geometrical effects on the degree of bending (DoB) in offshore tubular K-joints under out-of-plane bending loads." Applied Ocean Research. 58, pp. 1-10. https://doi.org/10.1016/j.apor.2016.03.004
A probability distribution model for SCFs in internally ring-stiffened tubular KT-joints of offshore structures subjected to out-of-plane bending loads
Ahmadi, Hamid. 2016. "A probability distribution model for SCFs in internally ring-stiffened tubular KT-joints of offshore structures subjected to out-of-plane bending loads." Ocean Engineering. 116, pp. 184-199. https://doi.org/10.1016/j.oceaneng.2016.02.037
Static strength of offshore tubular T/Y-joints reinforced with collar plate subjected to tensile brace loading
Nassiraei, Hossein, Lotfollahi-Yaghin, Mohammad Ali and Ahmadi, Hamid. 2016. "Static strength of offshore tubular T/Y-joints reinforced with collar plate subjected to tensile brace loading." Thin-Walled Structures. 103, pp. 141-156. https://doi.org/10.1016/j.tws.2016.02.010
Parametric Study on the Effects of Pile Inclination Angle on the Response of Batter Piles in Offshore Jacket Platforms
Aminfar, Ali, Ahmadi, Hamid and Aminfar, Mohammad Hossein. 2016. "Parametric Study on the Effects of Pile Inclination Angle on the Response of Batter Piles in Offshore Jacket Platforms." Journal of Marine Science and Application. 15, pp. 193-200. https://doi.org/10.1007/s11804-016-1355-9
Static strength of collar plate reinforced tubular T/Y-joints under brace compressive loading
Nassiraei, Hossein, Lotfollahi-Yaghin, Mohammad Ali and Ahmadi, Hamid. 2016. "Static strength of collar plate reinforced tubular T/Y-joints under brace compressive loading." Journal of Constructional Steel Research. 119, pp. 39-49. https://doi.org/10.1016/j.jcsr.2015.12.011
Probabilistic analysis of stress concentration factors in tubular KT-joints reinforced with internal ring stiffeners under in-plane bending loads
Ahmadi, Hamid, Yeganeh, Ali, Mohammadi, Amir Hossain and Zavvar, Esmaeil. 2016. "Probabilistic analysis of stress concentration factors in tubular KT-joints reinforced with internal ring stiffeners under in-plane bending loads." Thin-Walled Structures. 99, pp. 58-75. https://doi.org/10.1016/j.tws.2015.11.010
Comparing the geodetical and geotechnical methods in investigating the deformation of earthfill dams; A case study of Mahabad Earthfill Dam, Iran
Aminfar, M. H., Rastbud, A., Ahmadi, H. and Naseri, A.. 2016. "Comparing the geodetical and geotechnical methods in investigating the deformation of earthfill dams; A case study of Mahabad Earthfill Dam, Iran." Journal of Engineering Science and Technology. 11 (4), pp. 619-637.
Probability density functions of SCFs in internally ring-stiffened tubular KT-joints of offshore structures subjected to axial loading
Ahmadi, Hamid, Mohammadi, A. and Yeganeh, Ali. 2015. "Probability density functions of SCFs in internally ring-stiffened tubular KT-joints of offshore structures subjected to axial loading." Thin-Walled Structures. 94, pp. 485-499. https://doi.org/10.1016/j.tws.2015.05.012
Degree of bending (DoB) in tubular K-joints of offshore structures subjected to in-plane bending (IPB) loads: Study of geometrical effects and parametric formulation
Ahmadi, Hamid, Lotfollahi-Yaghin, Mohammad Ali and Asoodeh, Shadi. 2015. "Degree of bending (DoB) in tubular K-joints of offshore structures subjected to in-plane bending (IPB) loads: Study of geometrical effects and parametric formulation." Ocean Engineering. 102, pp. 105-116. https://doi.org/10.1016/j.oceaneng.2015.04.050
Stress concentration due to in-plane bending (IPB) loads in ring-stiffened tubular KT-joints of offshore structures: Parametric study and design formulation
Ahmadi, Hamid and Lotfollahi-Yaghin, Mohammad Ali. 2015. "Stress concentration due to in-plane bending (IPB) loads in ring-stiffened tubular KT-joints of offshore structures: Parametric study and design formulation." Applied Ocean Research. 51, pp. 54-66. https://doi.org/10.1016/j.apor.2015.02.009
Stress concentration factors induced by out-of-plane bending loads in ring-stiffened tubular KT-joints of jacket structures
Ahmadi, Hamid and Zavvar, Esmaeil. 2015. "Stress concentration factors induced by out-of-plane bending loads in ring-stiffened tubular KT-joints of jacket structures." Thin-Walled Structures. 91, pp. 82-95. https://doi.org/10.1016/j.tws.2015.02.011
Probabilistic analysis of stress intensity factor (SIF) and degree of bending (DoB) in axially loaded tubular K-joints of offshore structures
Ahmadi, Hamid and Ghaffari, Amirreza. 2015. "Probabilistic analysis of stress intensity factor (SIF) and degree of bending (DoB) in axially loaded tubular K-joints of offshore structures." Latin American Journal of Solids and Structures. 12 (11), pp. 2025-2044. https://doi.org/10.1590/1679-78251698
Probabilistic Assessment of Degree of Bending in Tubular X-Joints of Offshore Structures Subjected to Bending Loads
Ahmadi, Hamid and Ghaffari, Amirreza. 2015. "Probabilistic Assessment of Degree of Bending in Tubular X-Joints of Offshore Structures Subjected to Bending Loads." Advances in Civil Engineering. 2015, pp. 1-13. https://doi.org/10.1155/2015/518450
Chord-side SCF distribution of central brace in internally ring-stiffened tubular KT-joints: A geometrically parametric study
Ahmadi, Hamid, Lotfollahi-Yaghin, Mohammad Ali and Yong-Bo, Shao. 2013. "Chord-side SCF distribution of central brace in internally ring-stiffened tubular KT-joints: A geometrically parametric study." Thin-Walled Structures. 70, pp. 93-105. https://doi.org/10.1016/j.tws.2013.04.011
Effect of SCFs on S-N based fatigue reliability of multi-planar tubular DKT-joints of offshore jacket-type structures
Ahmadi, Hamid and Lotfollahi-Yaghin, Mohammad Ali. 2013. "Effect of SCFs on S-N based fatigue reliability of multi-planar tubular DKT-joints of offshore jacket-type structures." Ships and Offshore Structures. 8 (1), pp. 55-72. https://doi.org/10.1080/17445302.2011.627750
Parametric study and formulation of outer-brace geometric stress concentration factors in internally ring-stiffened tubular KT-joints of offshore structures
Ahmadi, Hamid, Lotfollahi-Yaghin, Mohammad Ali, Yong-Bo, Shao and Aminfar, Mohammad H.. 2012. "Parametric study and formulation of outer-brace geometric stress concentration factors in internally ring-stiffened tubular KT-joints of offshore structures." Applied Ocean Research. 38, pp. 74-91. https://doi.org/10.1016/j.apor.2012.07.004
The development of fatigue design formulas for the outer brace SCFs in offshore three-planar tubular KT-joints
Ahmadi, Hamid, Lotfollahi-Yaghin, Mohammad Ali and Aminfar, Mohammad H.. 2012. "The development of fatigue design formulas for the outer brace SCFs in offshore three-planar tubular KT-joints." Thin-Walled Structures. 58, pp. 67-78. https://doi.org/10.1016/j.tws.2012.04.011
Slamming induced dynamic response of a floating structure
Lotfollahi-Yaghin, Mohammad Ali, Rastgar, Mehdi and Ahmadi, Hamid. 2012. "Slamming induced dynamic response of a floating structure." Journal of Marine Science and Technology (Taiwan). 20 (2), pp. 201-209. https://doi.org/10.51400/2709-6998.1839
A probability distribution model for stress concentration factors in multi-planar tubular DKT-joints of steel offshore structures
Ahmadi, Hamid and Lotfollahi-Yaghin, Mohammad Ali. 2012. "A probability distribution model for stress concentration factors in multi-planar tubular DKT-joints of steel offshore structures." Applied Ocean Research. 34, pp. 21-32. https://doi.org/10.1016/j.apor.2011.11.002
Geometrically parametric study of central brace SCFs in offshore three-planar tubular KT-joints
Ahmadi, Hamid and Lotfollahi-Yaghin, Mohammad Ali. 2012. "Geometrically parametric study of central brace SCFs in offshore three-planar tubular KT-joints." Journal of Constructional Steel Research. 71, pp. 149-161. https://doi.org/10.1016/j.jcsr.2011.10.024
Effect of stress concentration factors on the structural integrity assessment of multi-planar offshore tubular DKT-joints based on the fracture mechanics fatigue reliability approach
Ahmadi, Hamid, Lotfollahi-Yaghin, Mohammad Ali and Aminfar, Mohammad H.. 2011. "Effect of stress concentration factors on the structural integrity assessment of multi-planar offshore tubular DKT-joints based on the fracture mechanics fatigue reliability approach." Ocean Engineering. 38 (17-18), pp. 1883-1893. https://doi.org/10.1016/j.oceaneng.2011.08.004
Distribution of weld toe stress concentration factors on the central brace in two-planar CHS DKT-connections of steel offshore structures
Ahmadi, Hamid, Lotfollahi-Yaghin, Mohammad Ali and Aminfar, Mohammad H.. 2011. "Distribution of weld toe stress concentration factors on the central brace in two-planar CHS DKT-connections of steel offshore structures." Thin-Walled Structures. 49 (10), pp. 1225-1236. https://doi.org/10.1016/j.tws.2011.06.001
Geometrical effect on SCF distribution in uni-planar tubular DKT-joints under axial loads
Ahmadi, Hamid, Lotfollahi-Yaghin, Mohammad Ali and Aminfar, Mohammad H.. 2011. "Geometrical effect on SCF distribution in uni-planar tubular DKT-joints under axial loads." Journal of Constructional Steel Research. 67 (8), pp. 1282-1291. https://doi.org/10.1016/j.jcsr.2011.03.011
Geometric stress distribution along the weld toe of the outer brace in two-planar tubular DKT-joints: Parametric study and deriving the SCF design equations
Lotfollahi-Yaghin, Mohammad Ali and Ahmadi, Hamid. 2011. "Geometric stress distribution along the weld toe of the outer brace in two-planar tubular DKT-joints: Parametric study and deriving the SCF design equations." Marine Structures. 24 (3), pp. 239-260. https://doi.org/10.1016/j.marstruc.2011.02.005
Geometrical Parametric Study and Development of Design Formulae for the SCF Distribution Along the Weld Toe in Multi-Planar CHS DKT-Connections of Offshore Structures
Lotfollahi-Yaghin, Mohammad Ali, Ahmadi, Hamid and Shahverdi, Sajad. 2011. "Geometrical Parametric Study and Development of Design Formulae for the SCF Distribution Along the Weld Toe in Multi-Planar CHS DKT-Connections of Offshore Structures ." ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. Rotterdam, The Netherlands 19 - 24 Jun 2011 American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/OMAE2011-49121
Effect of geometrical parameters on SCF distribution along the weld toe of tubular KT-joints under balanced axial loads
Lotfollahi-Yaghin, Mohammad Ali and Ahmadi, Hamid. 2010. "Effect of geometrical parameters on SCF distribution along the weld toe of tubular KT-joints under balanced axial loads." International Journal of Fatigue. 32 (4), pp. 703-719. https://doi.org/10.1016/j.ijfatigue.2009.10.008
Dynamic behaviour of damaged reinforced concrete beams and application of white noise analysis to crack detection
Lotfollahi-Yaghin, M.A., Shahinpar, R. and Ahmadi, H.. 2009. "Dynamic behaviour of damaged reinforced concrete beams and application of white noise analysis to crack detection." Journal of the South African Institution of Civil Engineering. 51 (2), pp. 2-10.