Pub Date : 2026-04-01Epub Date: 2026-01-12DOI: 10.1016/j.jcsr.2025.110228
Chaobei Gao , Ying Wu , Zhuohong Du , Kang Cen
Dents, common defects in natural gas pipelines, can cause stress concentration, which can potentially lead to leaks or ruptures and pose significant safety risks. This study presents a pipeline dent damage assessment method based on the modified Mohr–Coulomb ductile fracture criterion and the finite element method. A dual-criterion framework incorporating a damage monitoring criterion and a damage fracture criterion is established. This system employs a hybrid test-simulation approach combined with the modified Mohr–Coulomb criterion. A cumulative-damage finite element model that accounts for a historical variable is developed, and this method addresses the shortcomings of traditional approaches that overlook damage accumulation effects. On this basis, dent depth is integrated with the historical variable, and two assessment indicators are proposed, namely the damage monitoring threshold and the damage fracture threshold. Through multi-factor threshold analysis, the method demonstrates high adaptability and effectiveness in engineering applications. Overall, this study provides a practical and reliable solution for pipeline integrity assessment.
{"title":"Damage assessment method for natural gas pipeline dents via modified Mohr-Coulomb criterion","authors":"Chaobei Gao , Ying Wu , Zhuohong Du , Kang Cen","doi":"10.1016/j.jcsr.2025.110228","DOIUrl":"10.1016/j.jcsr.2025.110228","url":null,"abstract":"<div><div>Dents, common defects in natural gas pipelines, can cause stress concentration, which can potentially lead to leaks or ruptures and pose significant safety risks. This study presents a pipeline dent damage assessment method based on the modified Mohr–Coulomb ductile fracture criterion and the finite element method. A dual-criterion framework incorporating a damage monitoring criterion and a damage fracture criterion is established. This system employs a hybrid test-simulation approach combined with the modified Mohr–Coulomb criterion. A cumulative-damage finite element model that accounts for a historical variable is developed, and this method addresses the shortcomings of traditional approaches that overlook damage accumulation effects. On this basis, dent depth is integrated with the historical variable, and two assessment indicators are proposed, namely the damage monitoring threshold and the damage fracture threshold. Through multi-factor threshold analysis, the method demonstrates high adaptability and effectiveness in engineering applications. Overall, this study provides a practical and reliable solution for pipeline integrity assessment.</div></div>","PeriodicalId":15557,"journal":{"name":"Journal of Constructional Steel Research","volume":"239 ","pages":"Article 110228"},"PeriodicalIF":4.0,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145979396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-04-01Epub Date: 2026-01-17DOI: 10.1016/j.jcsr.2026.110251
Jiadi Liu , Yu Zhang , Shuang Lyu , Yang Liu , Zhihua Chen , Peng Sun , Qi An
Cold-formed thin-walled steel columns with asymmetric complex edges are widely used in the modular emergency buildings, yet the axial compressive behavior of these columns remains unclear. In this study, 32 specimens were tested under uniaxial compression to clarify failure modes and axial compressive capacity. Results revealed that specimens loaded through long flanges exhibit superior resistance to strength failure, while short-flange loaded specimens showed enhanced stability performance. Additionally, a finite element model (FEM) was developed and experimentally validated. Besides, the finite strip analysis revealed that specimens shorter than 900 mm primarily experienced distortional and local buckling, while those exceeding this length exhibited overall buckling. Finally, a theoretical calculation equation, based on the Direct Strength Method (DSM) formula in AISI, was proposed by integrating numerical simulation results and buckling mode contributions, resulting in improved prediction accuracy for critical buckling modes of varying slenderness ratios. The key results reveal the failure modes of cold-formed steel columns with slenderness ratios and propose the DSM-based theoretical equations, offering a reference for future engineering applications in the modular emergency buildings.
{"title":"Axial compressive behavior of an asymmetric steel columns in modular emergency buildings","authors":"Jiadi Liu , Yu Zhang , Shuang Lyu , Yang Liu , Zhihua Chen , Peng Sun , Qi An","doi":"10.1016/j.jcsr.2026.110251","DOIUrl":"10.1016/j.jcsr.2026.110251","url":null,"abstract":"<div><div>Cold-formed thin-walled steel columns with asymmetric complex edges are widely used in the modular emergency buildings, yet the axial compressive behavior of these columns remains unclear. In this study, 32 specimens were tested under uniaxial compression to clarify failure modes and axial compressive capacity. Results revealed that specimens loaded through long flanges exhibit superior resistance to strength failure, while short-flange loaded specimens showed enhanced stability performance. Additionally, a finite element model (FEM) was developed and experimentally validated. Besides, the finite strip analysis revealed that specimens shorter than 900 mm primarily experienced distortional and local buckling, while those exceeding this length exhibited overall buckling. Finally, a theoretical calculation equation, based on the Direct Strength Method (DSM) formula in AISI, was proposed by integrating numerical simulation results and buckling mode contributions, resulting in improved prediction accuracy for critical buckling modes of varying slenderness ratios. The key results reveal the failure modes of cold-formed steel columns with slenderness ratios and propose the DSM-based theoretical equations, offering a reference for future engineering applications in the modular emergency buildings.</div></div>","PeriodicalId":15557,"journal":{"name":"Journal of Constructional Steel Research","volume":"239 ","pages":"Article 110251"},"PeriodicalIF":4.0,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146035106","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-04-01Epub Date: 2026-01-05DOI: 10.1016/j.jcsr.2025.110212
Zaiyu Zhang , Wenqi Fu , Qinggang Chen , Xianghong Liu , Jinghua Zhang , Yao Yin , Gangping Dai , Qing Sun
Concrete-filled stiffened steel tubular (CFSST) columns exhibit excellent seismic performance. However, the mechanical mechanism of such composite columns remains unclear, and the accurate prediction of their load–displacement curves is still an unresolved issue. To address the limitations in understanding and predicting the seismic behavior of CFSST columns, this study developed and validated a refined numerical model. The loading process was segmented into three stages according to the characteristic points, enabling a detailed examination of the mechanical behavior of each component and the interaction mechanisms between the steel tube and the concrete or ECC. Based on mechanical equilibrium and the plane section assumption, load and deformation analysis models were established, from which a simplified three-stage skeleton curve was formulated to describe nonlinear behavior. Unloading stiffness and hysteresis rules were then defined for various loading stages, resulting in a comprehensive nonlinear hysteresis model. Comparative analysis with experimental and numerical results confirmed the model's accuracy and reliability, providing a robust theoretical foundation for the design and engineering application of CFSST columns. The findings demonstrate that the yielding of the steel tube markedly reduced its confinement to the concrete and ECC, leading to rapid post-peak strength degradation, whereas the ECC significantly delayed this deterioration through fiber-bridging effects. The contact pressure analysis confirmed stronger confinement in the concrete under axial loading, with stiffener regions providing the most pronounced confinement effect after tube yielding. The developed model effectively captured the hysteretic behavior of CFSST columns and provided a robust theoretical foundation for their analysis and engineering application.
{"title":"Numerical analysis and hysteresis modeling of concrete/ECC filled stiffened steel tubular column","authors":"Zaiyu Zhang , Wenqi Fu , Qinggang Chen , Xianghong Liu , Jinghua Zhang , Yao Yin , Gangping Dai , Qing Sun","doi":"10.1016/j.jcsr.2025.110212","DOIUrl":"10.1016/j.jcsr.2025.110212","url":null,"abstract":"<div><div>Concrete-filled stiffened steel tubular (CFSST) columns exhibit excellent seismic performance. However, the mechanical mechanism of such composite columns remains unclear, and the accurate prediction of their load–displacement curves is still an unresolved issue. To address the limitations in understanding and predicting the seismic behavior of CFSST columns, this study developed and validated a refined numerical model. The loading process was segmented into three stages according to the characteristic points, enabling a detailed examination of the mechanical behavior of each component and the interaction mechanisms between the steel tube and the concrete or ECC. Based on mechanical equilibrium and the plane section assumption, load and deformation analysis models were established, from which a simplified three-stage skeleton curve was formulated to describe nonlinear behavior. Unloading stiffness and hysteresis rules were then defined for various loading stages, resulting in a comprehensive nonlinear hysteresis model. Comparative analysis with experimental and numerical results confirmed the model's accuracy and reliability, providing a robust theoretical foundation for the design and engineering application of CFSST columns. The findings demonstrate that the yielding of the steel tube markedly reduced its confinement to the concrete and ECC, leading to rapid post-peak strength degradation, whereas the ECC significantly delayed this deterioration through fiber-bridging effects. The contact pressure analysis confirmed stronger confinement in the concrete under axial loading, with stiffener regions providing the most pronounced confinement effect after tube yielding. The developed model effectively captured the hysteretic behavior of CFSST columns and provided a robust theoretical foundation for their analysis and engineering application.</div></div>","PeriodicalId":15557,"journal":{"name":"Journal of Constructional Steel Research","volume":"239 ","pages":"Article 110212"},"PeriodicalIF":4.0,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145895816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-04-01Epub Date: 2026-01-16DOI: 10.1016/j.jcsr.2026.110246
Wen-Chao Xie , Yong Ye , Hang Jiang , Ping Jin , Yang Liu
The axial compressive behavior of concrete-filled plastic-lined steel tubular (CFPLST) joints is investigated through experimental investigation and finite element analysis. Seven T-joints were tested under monotonic axial compression applied to the circular hollow-section web, while the chord was simply supported. The experimental program systematically investigated the effects of key parameters, including the web-to-chord diameter ratio β (0.36–0.69), concrete strength fcu (30 MPa and 85 MPa), fillet-weld leg size hw (3–7 mm) and casting sequence (pre- vs post-welding). All specimens failed by local buckling of the web near the saddle; neither chord punching-shear, weld rupture nor concrete crushing was observed. The chord ovalization remained below 1% and the polyethylene liner stayed intact, confirming that the compressive capacity is governed by web instability rather than by chord strength. A parallel finite element analysis (FEA) model, validated with test data, was used to extend the parametric space to 120 analyses. The numerical study showed that β is the dominant factor influencing the ultimate load, whereas fcu, hw and the plastic-layer thickness have minor influence. Finally, a mechanics-based design equation is proposed that predicts the axial compressive capacity of CFPLST T-joints within ±5% of both experimental and FEA results, providing a simple and reliable tool for practical design and direct application in SSC-filled truss structures.
{"title":"Compressive performance of concrete-filled plastic-lined steel tubular T-joints: experiments and formulation","authors":"Wen-Chao Xie , Yong Ye , Hang Jiang , Ping Jin , Yang Liu","doi":"10.1016/j.jcsr.2026.110246","DOIUrl":"10.1016/j.jcsr.2026.110246","url":null,"abstract":"<div><div>The axial compressive behavior of concrete-filled plastic-lined steel tubular (CFPLST) joints is investigated through experimental investigation and finite element analysis. Seven T-joints were tested under monotonic axial compression applied to the circular hollow-section web, while the chord was simply supported. The experimental program systematically investigated the effects of key parameters, including the web-to-chord diameter ratio <em>β</em> (0.36–0.69), concrete strength <em>f</em><sub>cu</sub> (30 MPa and 85 MPa), fillet-weld leg size <em>h</em><sub>w</sub> (3–7 mm) and casting sequence (pre- vs post-welding). All specimens failed by local buckling of the web near the saddle; neither chord punching-shear, weld rupture nor concrete crushing was observed. The chord ovalization remained below 1% and the polyethylene liner stayed intact, confirming that the compressive capacity is governed by web instability rather than by chord strength. A parallel finite element analysis (FEA) model, validated with test data, was used to extend the parametric space to 120 analyses. The numerical study showed that <em>β</em> is the dominant factor influencing the ultimate load, whereas <em>f</em><sub>cu</sub>, <em>h</em><sub>w</sub> and the plastic-layer thickness have minor influence. Finally, a mechanics-based design equation is proposed that predicts the axial compressive capacity of CFPLST T-joints within ±5% of both experimental and FEA results, providing a simple and reliable tool for practical design and direct application in SSC-filled truss structures.</div></div>","PeriodicalId":15557,"journal":{"name":"Journal of Constructional Steel Research","volume":"239 ","pages":"Article 110246"},"PeriodicalIF":4.0,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145979394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-04-01Epub Date: 2026-01-16DOI: 10.1016/j.jcsr.2026.110245
Paul Zauchner, Markus Kettler, Harald Unterweger
This paper introduces a design model for predicting local stresses in the web plates of I-section crane runway girders. A critical review of current design procedures reveals two principal shortcomings: (i) the role of the elastomeric bearing pad between the rail and the top flange is insufficiently accounted for, and (ii) existing methods cannot adequately capture the longitudinal distribution of local stresses. To address these gaps, new analytical expressions are developed and calibrated. The stiffness characteristics of elastomeric bearing pads are quantified through laboratory compression tests. Full-scale experiments on a crane runway girder are conducted to measure local strains and to assess the influence of both the bearing pad and geometric imperfections at the rail-flange interface. A comprehensive finite element parametric study is then used to calibrate and validate the analytical model. The resulting design model accurately reproduces local stress fields in contrast to current standards. It enables more economical girder designs by explicitly considering the beneficial effects of elastomeric bearing pads. Furthermore, the new design model provides a simple, standards-compatible modification (based on established analytical solutions) for both cases (elastomeric or rigid rail support).
{"title":"Assessing local stresses in crane runway girders considering the rail support","authors":"Paul Zauchner, Markus Kettler, Harald Unterweger","doi":"10.1016/j.jcsr.2026.110245","DOIUrl":"10.1016/j.jcsr.2026.110245","url":null,"abstract":"<div><div>This paper introduces a design model for predicting local stresses in the web plates of I-section crane runway girders. A critical review of current design procedures reveals two principal shortcomings: (i) the role of the elastomeric bearing pad between the rail and the top flange is insufficiently accounted for, and (ii) existing methods cannot adequately capture the longitudinal distribution of local stresses. To address these gaps, new analytical expressions are developed and calibrated. The stiffness characteristics of elastomeric bearing pads are quantified through laboratory compression tests. Full-scale experiments on a crane runway girder are conducted to measure local strains and to assess the influence of both the bearing pad and geometric imperfections at the rail-flange interface. A comprehensive finite element parametric study is then used to calibrate and validate the analytical model. The resulting design model accurately reproduces local stress fields in contrast to current standards. It enables more economical girder designs by explicitly considering the beneficial effects of elastomeric bearing pads. Furthermore, the new design model provides a simple, standards-compatible modification (based on established analytical solutions) for both cases (elastomeric or rigid rail support).</div></div>","PeriodicalId":15557,"journal":{"name":"Journal of Constructional Steel Research","volume":"239 ","pages":"Article 110245"},"PeriodicalIF":4.0,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145979398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-04-01Epub Date: 2026-01-08DOI: 10.1016/j.jcsr.2026.110234
Xu-Ze Feng, Xue-Chun Liu, Xuesen Chen, Wei Zhou, Kun Meng
A connection for a novel composite beam and a cruciform thin concrete encased steel (TCES) column is proposed in this study. The H-shape steel skeleton of the composite beam is combined by two steels, the bottom steel is inverted T-shape, the top steel is T-shape only used for the beam bearing negative moment. The two steel members are connected at their webs by high-strength bolts. Rectangular openings are introduced in the steel web to enhance the shear interaction between the beam and slab, while also facilitating the passage of pipelines and rebars. Three full-scale specimens were tested under quasi-static loading to evaluate the effects of stud arrangement and bolt-hole size on the seismic performance of the joints. The tests investigated failure modes, crack propagation, hysteretic response, energy dissipation, stiffness degradation, and strain distribution. The results indicate that the proposed joint exhibits excellent seismic performance. Energy dissipation is achieved through flange slip and plate deformation under strong earthquakes. The rectangular web openings effectively enhance the composite action between the beam and slab. Studs on the top flange mitigate premature slab cracking, and elongated bolt holes allow slip deformation without reducing load-carrying capacity. Based on a validated finite element (FE) model, a parametric study was further performed to examine the influence of axial compression ratio, bolt number, bottom flange thickness of the cantilever beam, and composite beam configuration on joint seismic behavior. Finally, calculation formulas for yielding and ultimate moments of the joint were developed and validated, showing good agreement with both test results and FE simulations.
{"title":"Seismic performance of joints for a novel composite beam and cruciform thin concrete encased steel column","authors":"Xu-Ze Feng, Xue-Chun Liu, Xuesen Chen, Wei Zhou, Kun Meng","doi":"10.1016/j.jcsr.2026.110234","DOIUrl":"10.1016/j.jcsr.2026.110234","url":null,"abstract":"<div><div>A connection for a novel composite beam and a cruciform thin concrete encased steel (TCES) column is proposed in this study. The H-shape steel skeleton of the composite beam is combined by two steels, the bottom steel is inverted T-shape, the top steel is T-shape only used for the beam bearing negative moment. The two steel members are connected at their webs by high-strength bolts. Rectangular openings are introduced in the steel web to enhance the shear interaction between the beam and slab, while also facilitating the passage of pipelines and rebars. Three full-scale specimens were tested under quasi-static loading to evaluate the effects of stud arrangement and bolt-hole size on the seismic performance of the joints. The tests investigated failure modes, crack propagation, hysteretic response, energy dissipation, stiffness degradation, and strain distribution. The results indicate that the proposed joint exhibits excellent seismic performance. Energy dissipation is achieved through flange slip and plate deformation under strong earthquakes. The rectangular web openings effectively enhance the composite action between the beam and slab. Studs on the top flange mitigate premature slab cracking, and elongated bolt holes allow slip deformation without reducing load-carrying capacity. Based on a validated finite element (FE) model, a parametric study was further performed to examine the influence of axial compression ratio, bolt number, bottom flange thickness of the cantilever beam, and composite beam configuration on joint seismic behavior. Finally, calculation formulas for yielding and ultimate moments of the joint were developed and validated, showing good agreement with both test results and FE simulations.</div></div>","PeriodicalId":15557,"journal":{"name":"Journal of Constructional Steel Research","volume":"239 ","pages":"Article 110234"},"PeriodicalIF":4.0,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145940932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Conventional H-section composite beams for long-span construction are susceptible to lateral-torsional buckling (LTB), particularly during the construction phase. This study introduces the Wide Steel Composite (WSC) girder, a novel section designed to address this vulnerability and enable slim-floor construction. The WSC girder consists of an H-section with a C-channel welded to its bottom flange to enhance torsional rigidity. This enhanced rigidity was quantified through finite element analysis (FEA), which demonstrated that the torsional constant () and warping constant () increased by up to 1.42 and 2.69 times, respectively, compared to a standard H-section. The girder's flexural performance was then investigated through four-point bending tests on five specimens with varying shear connector configurations. All WSC composite girders exhibited ductile flexural behavior, failing by concrete crushing after significant steel yielding. Notably, the specimen relying only on transverse stiffeners achieved comparable strength to those with traditional shear connectors, demonstrating that the stiffeners provide sufficient shear transfer through direct bearing. The experimental flexural strengths exceeded the nominal strengths calculated via the AISC 360–22 plastic stress distribution method by 15–18 %. The non-composite WSC girder's strength was also accurately predicted by AISC 360–22 Chapter F and validated by FEA.
{"title":"Flexural and torsional behavior of H-section composite girders with welded C-channels","authors":"In-Rak Choi , Sung-Chan Yang , Jae-Hwan Kyung , Sang-Hyeon Jeon","doi":"10.1016/j.jcsr.2025.110217","DOIUrl":"10.1016/j.jcsr.2025.110217","url":null,"abstract":"<div><div>Conventional H-section composite beams for long-span construction are susceptible to lateral-torsional buckling (LTB), particularly during the construction phase. This study introduces the Wide Steel Composite (WSC) girder, a novel section designed to address this vulnerability and enable slim-floor construction. The WSC girder consists of an H-section with a C-channel welded to its bottom flange to enhance torsional rigidity. This enhanced rigidity was quantified through finite element analysis (FEA), which demonstrated that the torsional constant (<span><math><mi>J</mi></math></span>) and warping constant (<span><math><msub><mi>C</mi><mi>w</mi></msub></math></span>) increased by up to 1.42 and 2.69 times, respectively, compared to a standard H-section. The girder's flexural performance was then investigated through four-point bending tests on five specimens with varying shear connector configurations. All WSC composite girders exhibited ductile flexural behavior, failing by concrete crushing after significant steel yielding. Notably, the specimen relying only on transverse stiffeners achieved comparable strength to those with traditional shear connectors, demonstrating that the stiffeners provide sufficient shear transfer through direct bearing. The experimental flexural strengths exceeded the nominal strengths calculated via the AISC 360–22 plastic stress distribution method by 15–18 %. The non-composite WSC girder's strength was also accurately predicted by AISC 360–22 Chapter F and validated by FEA.</div></div>","PeriodicalId":15557,"journal":{"name":"Journal of Constructional Steel Research","volume":"239 ","pages":"Article 110217"},"PeriodicalIF":4.0,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145941021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This study proposes a rapid method for quantifying fatigue degradation in welded joints with undercut defects. Cruciform joints with precisely machined undercut defects were fabricated through wire cutting, and fatigue tests were conducted with damage evolution monitored by acoustic emission (AE) signals. A finite element model incorporating AE-based fatigue damage mechanics was developed on the ABAQUS platform to simulate the fatigue failure process, and its reliability was validated against experimental data. The model was further employed to investigate the influence of undercut depth and radius on fatigue strength. Parametric analyses revealed that increasing defect depth and decreasing defect radius both markedly reduce fatigue performance, with depth exerting a dominant effect. Certain combinations of depth and radius led to similar reductions in fatigue strength, highlighting the coupled impact of geometric parameters. Based on numerical simulations, practical fatigue performance evaluation curves were proposed, including a simplified allowable-depth curve for cases where only defect depth can be measured. By integrating AE-based damage mechanics with defect-geometry numerical modeling, the proposed approach provides a rapid and reliable tool for assessing fatigue degradation and quality control of undercut-affected welded joints, ensuring structural safety while significantly improving assessment efficiency.
{"title":"Fatigue performance evaluation of stainless steel cruciform joint with welding undercut defects","authors":"Zhikuan Ren , Haosong Chang , Qingrui Yue , Xiaogang Liu","doi":"10.1016/j.jcsr.2026.110249","DOIUrl":"10.1016/j.jcsr.2026.110249","url":null,"abstract":"<div><div>This study proposes a rapid method for quantifying fatigue degradation in welded joints with undercut defects. Cruciform joints with precisely machined undercut defects were fabricated through wire cutting, and fatigue tests were conducted with damage evolution monitored by acoustic emission (AE) signals. A finite element model incorporating AE-based fatigue damage mechanics was developed on the ABAQUS platform to simulate the fatigue failure process, and its reliability was validated against experimental data. The model was further employed to investigate the influence of undercut depth and radius on fatigue strength. Parametric analyses revealed that increasing defect depth and decreasing defect radius both markedly reduce fatigue performance, with depth exerting a dominant effect. Certain combinations of depth and radius led to similar reductions in fatigue strength, highlighting the coupled impact of geometric parameters. Based on numerical simulations, practical fatigue performance evaluation curves were proposed, including a simplified allowable-depth curve for cases where only defect depth can be measured. By integrating AE-based damage mechanics with defect-geometry numerical modeling, the proposed approach provides a rapid and reliable tool for assessing fatigue degradation and quality control of undercut-affected welded joints, ensuring structural safety while significantly improving assessment efficiency.</div></div>","PeriodicalId":15557,"journal":{"name":"Journal of Constructional Steel Research","volume":"239 ","pages":"Article 110249"},"PeriodicalIF":4.0,"publicationDate":"2026-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145979395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-03-01Epub Date: 2025-12-30DOI: 10.1016/j.jcsr.2025.110200
Wenjiao Zhang , Xiumin Chen , Xiaohui Yuan , Xiangqing Kong , Wenchang He
Concrete-filled double skin steel tube (CFDST) columns are commonly employed in various building constructions because of their superior strength, low weight, strong bending stiffness, and excellent impact and fire resistance compared with concrete-filled steel tubular (CFST) columns. In their service life, these structures may be subjected to extreme events like fire and impact, which could result in structural collapse and serious damage. In this study, the ABAQUS simulation platform was used to evaluate the post-fire impact performance of CFDST columns by building a three-dimensional finite element model. After validating the experimental results, the lateral impact dynamic response of CFDST columns following fire is systematically analyzed. The impact resistance of CFDST columns after fire was evaluated in relation to a number of essential parameters, such as impact velocity, drop hammer mass, axial compression ratio, hollow ratio, steel tube yield strength, and slenderness ratio. The results indicate that CFDST columns suffered overall bending damage under lateral impact loads after the fire, and their impact resistance and bending capacity gradually decreasing as fire exposure time increases. Furthermore, a suggested simplified calculation technique is provided to precisely forecast the flexural strength and peak mid-span deflection of CFDST columns under post-fire transverse impact loading. This formula is based on parametric analysis and an equivalent plastic hinge simplified model.
{"title":"Investigation on concrete-filled double skin steel tube columns to impact resistance post-fire","authors":"Wenjiao Zhang , Xiumin Chen , Xiaohui Yuan , Xiangqing Kong , Wenchang He","doi":"10.1016/j.jcsr.2025.110200","DOIUrl":"10.1016/j.jcsr.2025.110200","url":null,"abstract":"<div><div>Concrete-filled double skin steel tube (CFDST) columns are commonly employed in various building constructions because of their superior strength, low weight, strong bending stiffness, and excellent impact and fire resistance compared with concrete-filled steel tubular (CFST) columns. In their service life, these structures may be subjected to extreme events like fire and impact, which could result in structural collapse and serious damage. In this study, the ABAQUS simulation platform was used to evaluate the post-fire impact performance of CFDST columns by building a three-dimensional finite element model. After validating the experimental results, the lateral impact dynamic response of CFDST columns following fire is systematically analyzed. The impact resistance of CFDST columns after fire was evaluated in relation to a number of essential parameters, such as impact velocity, drop hammer mass, axial compression ratio, hollow ratio, steel tube yield strength, and slenderness ratio. The results indicate that CFDST columns suffered overall bending damage under lateral impact loads after the fire, and their impact resistance and bending capacity gradually decreasing as fire exposure time increases. Furthermore, a suggested simplified calculation technique is provided to precisely forecast the flexural strength and peak mid-span deflection of CFDST columns under post-fire transverse impact loading. This formula is based on parametric analysis and an equivalent plastic hinge simplified model.</div></div>","PeriodicalId":15557,"journal":{"name":"Journal of Constructional Steel Research","volume":"238 ","pages":"Article 110200"},"PeriodicalIF":4.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145881013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2026-03-01Epub Date: 2025-12-18DOI: 10.1016/j.jcsr.2025.110204
Kezhi Liu , Jinfa Wang , Shan Gao , Man Xu
Efficiently and accurately assessing the impact performance of concrete-filled steel tubular columns, as well as incorporating impact-resistance considerations into the structural design process, remains a significant challenge in engineering practice. In this study, a database comprising 1575 samples was generated via numerical simulations, and six machine learning algorithms were employed to develop predictive models for assessing the post-impact damage of concrete-filled steel tubular columns. The artificial neural network model demonstrated the strongest accuracy and generalisation capability, even in an extra validation under unfamiliar conditions. The SHapley Additive exPlanations approach was implemented to interpret the individual importance of input features, and the joint effects of structural and loading features were investigated by progressive variation analysis. The results indicate that steel tube diameter, impact velocity and impact mass are the most influential features governing the post-impact damage of columns, while the effect of the axial compression ratio exhibits a two-stage pattern changing from beneficial to detrimental as it exceeds an inflexion point. Increasing the steel tube diameter and steel ratio are the most effective in improving the impact-resistance performance of concrete-filled steel tubular columns, but both exhibit significant diminishing returns. Finally, a machine learning-based inverse prediction model was developed to achieve cost-effective structural design by optimising a balance among steel tube diameter, steel ratio, and axial compression ratio. The preliminary design programs were also developed.
{"title":"Mechanical–data-driven performance interpretation and design of concrete-filled steel tubes under lateral impact","authors":"Kezhi Liu , Jinfa Wang , Shan Gao , Man Xu","doi":"10.1016/j.jcsr.2025.110204","DOIUrl":"10.1016/j.jcsr.2025.110204","url":null,"abstract":"<div><div>Efficiently and accurately assessing the impact performance of concrete-filled steel tubular columns, as well as incorporating impact-resistance considerations into the structural design process, remains a significant challenge in engineering practice. In this study, a database comprising 1575 samples was generated via numerical simulations, and six machine learning algorithms were employed to develop predictive models for assessing the post-impact damage of concrete-filled steel tubular columns. The artificial neural network model demonstrated the strongest accuracy and generalisation capability, even in an extra validation under unfamiliar conditions. The SHapley Additive exPlanations approach was implemented to interpret the individual importance of input features, and the joint effects of structural and loading features were investigated by progressive variation analysis. The results indicate that steel tube diameter, impact velocity and impact mass are the most influential features governing the post-impact damage of columns, while the effect of the axial compression ratio exhibits a two-stage pattern changing from beneficial to detrimental as it exceeds an inflexion point. Increasing the steel tube diameter and steel ratio are the most effective in improving the impact-resistance performance of concrete-filled steel tubular columns, but both exhibit significant diminishing returns. Finally, a machine learning-based inverse prediction model was developed to achieve cost-effective structural design by optimising a balance among steel tube diameter, steel ratio, and axial compression ratio. The preliminary design programs were also developed.</div></div>","PeriodicalId":15557,"journal":{"name":"Journal of Constructional Steel Research","volume":"238 ","pages":"Article 110204"},"PeriodicalIF":4.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145788349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
扫码关注我们
求助内容：
应助结果提醒方式：
京公网安备 11010802042870号