Journal of Constructional Steel Research最新文献

{"title":"Axial compression behavior of corner-stiffened concrete-filled double-skin steel tubular (CFDST) members: Experimental and analytical research","authors":"Jian-Tao Wang,&nbsp;Kai-Lin Yang,&nbsp;Yang Yang,&nbsp;Zu-Qiang Liu,&nbsp;Juan Wang","doi":"10.1016/j.jcsr.2025.110164","DOIUrl":"10.1016/j.jcsr.2025.110164","url":null,"abstract":"<div><div>Traditional square concrete-filled double-skin steel tubular (CFDST) member inevitably has the limitation of stress concentration at the steel tube corners, making it difficult to meet the development needs of heavy-load structures. This paper proposed a new-type corner-stiffened CFDST members for the potential application in the towers or piers of long-span bridges. An axial compression test was conduct to investigate its compressive behavior, where the failure mode involved the inward buckling of inner steel tube, outward buckling of flat steel plate and corner steel tube, and the concrete crushing. A finite element (FE) model was verified in terms of the failure mode, full-range load-displacement curve and maximum bearing capacity, for the further mechanism analysis and parametric study. Mechanism investigation reflects that: the reinforcement of corner concrete-filled steel tubular (CFST) members intensifies the confining stress between the corner concrete and corner steel tube within the reinforced zone; the flat steel plate and inner steel tube function independently, without generating substantial confining stress. Parametric study on material-geometric parameters reveals that: inner steel tube strength (<em>f</em>_yi) has a slight effect on the compressive capacity, e.g., the bearing capacity respectively improves by 1.85 % and 2.98 % as <em>f</em>_yi increases from 355 MPa to 460 MPa and 550 MPa; inner steel tube strength, diameter-to-thickness ratio of inner steel tube, and hollow ratio slightly affect the confining stress of the corner CFST component. Finally, the calculation method was established and validated for predicting the compressive capacity of corner-stiffened CFDST members.</div></div>","PeriodicalId":15557,"journal":{"name":"Journal of Constructional Steel Research","volume":"238 ","pages":"Article 110164"},"PeriodicalIF":4.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145736006","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}

{"title":"Cyclic behavior of single-sided beam-column joints with tension-compression bolts: Theoretical, experimental and numerical investigations","authors":"Jiming Zhang ,&nbsp;Yulong Feng ,&nbsp;Xun Chong ,&nbsp;Cheng Han ,&nbsp;Chao Tong ,&nbsp;Lihua Chen","doi":"10.1016/j.jcsr.2025.110207","DOIUrl":"10.1016/j.jcsr.2025.110207","url":null,"abstract":"<div><div>Existing resilient steel beam-column joints adopt a double-sided opening mechanism that resulted in slab damage during earthquakes. To address this, a novel single-sided beam-column joint with tension-compression bolts (TCBs) and a buckling-restrained flange cover plate (BFCP) was proposed, which features an opening-closing mechanism at the bottom flange. A theoretical hysteretic model of the joint was first established, and this was followed by conducting quasistatic tests of four full-scale samples to evaluate its cyclic behavior. The effects of the key parameters, including the presence of a BFCP, the TCB preload level, and the core plate strength, on the cyclic behavior of the joint were examined. A finite-element model (FEM) was subsequently developed and validated against the test results. The validated FEM was then employed to verify the theoretical hysteretic model and to investigate the influence of the top flange connection plates (TFCPs) on the cyclic behavior. The results indicate that the joint achieves the intended single-sided opening-closing mechanism, with reduced residual deformation and enhanced energy dissipation. The addition of a BFCP increased energy dissipation by 77.7 % but increased residual deformation by 29.5 %; the absence of TCB preloading led to greater hysteresis and increased residual deformation by 29.5 %; and the decrease in the core plate strength reduced peak moment but improved the self-centering performance. The form of the TFCP influenced the cyclic behavior of the joint by altering the location of its rotation center, and an overly thin TFCP may yield during loading and consequently reduce the self-centering performance of the joint.</div></div>","PeriodicalId":15557,"journal":{"name":"Journal of Constructional Steel Research","volume":"238 ","pages":"Article 110207"},"PeriodicalIF":4.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145837563","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}

{"title":"Corrigendum to Axial compression behaviours of UHPC-filled stainless steel tubes at cold-region low temperatures [Journal of Constructional Steel Research Volume 235, December 2025, 109813]","authors":"Jia-Bao Yan ,&nbsp;Yixuan Wang ,&nbsp;Yunbiao Luo ,&nbsp;Zirui Wang ,&nbsp;Zhe Wang","doi":"10.1016/j.jcsr.2025.110194","DOIUrl":"10.1016/j.jcsr.2025.110194","url":null,"abstract":"","PeriodicalId":15557,"journal":{"name":"Journal of Constructional Steel Research","volume":"238 ","pages":"Article 110194"},"PeriodicalIF":4.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145921332","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}

{"title":"Extreme static and blast performance of CFS roof trusses with symmetric profiles","authors":"Alaa Elsisi ,&nbsp;Mohamed Elsawi Mahmoud ,&nbsp;Ryan Salter ,&nbsp;Michael Newberry ,&nbsp;Hani Salim","doi":"10.1016/j.jcsr.2025.110218","DOIUrl":"10.1016/j.jcsr.2025.110218","url":null,"abstract":"<div><div>Cold-formed steel (CFS) trusses are preferred due to their low weight, high ductility, and strength. They are suitable for both civilian and military structures. When a blast wave impacts a building, the front wall is typically the most critical area. While heavy roofs, generally do not experience significant issues, lighter systems such as CFS trusses are more susceptible to blast pressures on the roof, as their lower mass increases vulnerability. Due to the lack of standard sections and connecting methods of CFS trusses, there are practical implications for the design and safety standards of these structures, especially under the effect of blast loads. Every CFS manufacturer designs unique section profiles, which include both symmetric and asymmetric configurations. Numerical simulations provide a valuable tool for studying structures under extreme conditions, particularly blast loads. However, experimental data is essential for validating these models to ensure accuracy. Having such a dataset will provide the key inputs required to validate and calibrate numerical models for blast assessment, enabling more reliable prediction of both localized (connection) and system-level responses. The objective of this study is to perform high-accuracy experimental tests to support future validation of numerical models. This experimental program includes full-scale static and blast testing of CFS roof trusses with symmetric profiles, along with screw joint and material characterization tests. Both static and dynamic tests indicate that connection failure plays a pivotal role in the performance of CFS joist trusses.</div></div>","PeriodicalId":15557,"journal":{"name":"Journal of Constructional Steel Research","volume":"238 ","pages":"Article 110218"},"PeriodicalIF":4.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145881006","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}

{"title":"Parametric analysis and design method for diaphragm-free composite beam to CCHSST column joints","authors":"Jiangran Guo ,&nbsp;Zhipeng Zhou ,&nbsp;He Zhao ,&nbsp;Xuejin Mao ,&nbsp;Longhui Sun","doi":"10.1016/j.jcsr.2025.110202","DOIUrl":"10.1016/j.jcsr.2025.110202","url":null,"abstract":"<div><div>Cold-formed high-strength square steel tubes (CHSSTs) exhibit high standardization, excellent mechanical properties, and low carbon emissions. Given the critical role of joints in structural systems, the related paper proposed a novel diaphragm-free composite beam to concrete-filled cold-formed high-strength square steel tubular (CCHSST) column joint. To further investigate the key parameters and develop a seismic design method for diaphragm-free joints, the influence of the column wall thickness and the thickened area height in the joint zone on the seismic performance of the joints was systematically examined based on validated finite element models (FEMs). A total of 70 models were established for the joints with different column-to-beam linear stiffness ratios and strengthening coefficients. The results indicate that the column wall thickness in the joint zone is a critical factor affecting the seismic performance of diaphragm-free joints. To achieve the design objective of relocating the plastic hinge to the beam, the column wall thickness in the joint zone must be at least 2 times the conventional column thickness, and the thickened area height must be at least 1.1 times the beam height. When the strengthening factor is not less than 1.3, the column wall thickness can be relaxed to at least 1.5 times the conventional column thickness, but the thickened area height should be at least 1.3 times the beam height. By analyzing the different failure modes and force transfer mechanisms, the corresponding calculation formulas for their flexural bearing capacity were developed. Ultimately, a systematic design method for the diaphragm-free joints was proposed, providing a theoretical basis for engineering applications.</div></div>","PeriodicalId":15557,"journal":{"name":"Journal of Constructional Steel Research","volume":"238 ","pages":"Article 110202"},"PeriodicalIF":4.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145788397","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}

{"title":"Behaviour of plywood-sheathed cold-formed steel shear walls under monotonic and cyclic in-plane shear loading","authors":"Karmugilan Selvakumari Panchamoorthy,&nbsp;Mahendrakumar Mathialagu Madhavan","doi":"10.1016/j.jcsr.2025.110172","DOIUrl":"10.1016/j.jcsr.2025.110172","url":null,"abstract":"<div><div>A total of sixteen full scale cold-formed steel (CFS) shear wall panels sheathed with plywood were tested to investigate the seismic performance under monotonic and cyclic loading conditions. The primary objective is to study the influence of sheathing thickness and screw spacing on the wall's initial stiffness, shear strength, ductility, stiffness degradation and energy dissipation capacity. A 3-dimensional Digital Image Correlation (DIC) was employed to study the full field behaviour of CFS shear wall and to obtain in-plane deformation and strain distribution under various stages of loading. The failure modes, including tilting, bearing, pull-through, and screw shear failure were observed, depending on sheathing thickness and screw spacing. Reducing screw spacing from 150 mm to 100 mm enhanced the average yield strength by up to 30 %, while increasing sheathing thickness from 9 mm to 12 mm improved the initial stiffness and ultimate strength, providing greater resistance to shear deformation. The experimental-to-code strength ratios ranged between 1.15 and 1.35, confirming the conservatism of current AISI S400–20 provisions. Although thicker sheathing contributed to higher stiffness, the overall in-plane shear resistance was still governed by the screw-to-sheathing connection, as confirmed through detailed observations and Digital Image Correlation (DIC) analysis. These findings validate the capacity-based design principle, wherein the sheathing-to-frame connection acts as the primary ductile mechanism while maintaining frame integrity. The present study addresses limitations in shear strength estimation in AISI S400–20, particularly for double-sided sheathed CFS walls with 2 mm thick framing configurations not explicitly covered in current standards. The findings provide insight into the influence of framing thickness, fastener layout, and sheathing properties on wall performance, and suggest essential considerations for refining design approaches and guiding future experimental research in CFS construction systems.</div></div>","PeriodicalId":15557,"journal":{"name":"Journal of Constructional Steel Research","volume":"238 ","pages":"Article 110172"},"PeriodicalIF":4.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145736010","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}

{"title":"Characterization of ductile fracture behavior for Q355 steel under complex stress states","authors":"Wang Dou ,&nbsp;Zejian Xu ,&nbsp;Yang Han ,&nbsp;Fenglei Huang","doi":"10.1016/j.jcsr.2025.110219","DOIUrl":"10.1016/j.jcsr.2025.110219","url":null,"abstract":"<div><div>To reveal the fracture initiation mechanisms and establish the correlation between the ductile fracture mechanism and macroscopic mechanical behaviors in Q355 steel, ductile behavior of the Q355 steel was comprehensively examined across a broad spectrum of stress states. Seven types of specimens were utilized to generate various stress states, consisting of smooth and notched round bar, flat grooved plate, compression, shear, shear-compression, and shear-tension specimens. Finite element models of the fracture specimens were established, with good agreement between the simulated and measured force-displacement curves demonstrated. Through the experiments and simulations, the fracture strain, stress triaxiality, and Lode angle parameter were determined. The fracture mechanisms are strongly governed by stress state: dimple-dominated fracture prevails under high triaxiality, whereas a mixed shear-dimple mode dominates at low triaxiality. Based on test data, a recently developed fracture model that incorporates both stress triaxiality and Lode angle parameter was calibrated to construct 3D fracture locus. Furthermore, a validation test was carried out to evaluate robustness and calculation accuracy of present model. The results demonstrate strong consistency between experiment and simulation in terms of fracture displacement and fracture morphology. This work provides a theoretical foundation and practical insight for the fracture-resistant design and application of steel structures.</div></div>","PeriodicalId":15557,"journal":{"name":"Journal of Constructional Steel Research","volume":"238 ","pages":"Article 110219"},"PeriodicalIF":4.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145881068","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}

{"title":"Study on optimization method of axially compressed SLM manufacturing free corrugated square tubes","authors":"Bing-Bing San ,&nbsp;Xiang Cheng ,&nbsp;Zhi-Wei Shan ,&nbsp;Ye Qiu","doi":"10.1016/j.jcsr.2025.110213","DOIUrl":"10.1016/j.jcsr.2025.110213","url":null,"abstract":"<div><div>Traditional shape optimization of thin-walled components mostly relies on regular corrugations and equal-section optimization methods, resulting in limited shape freedom. To address this limitation, this paper proposes an optimization method for free-form corrugated components based on Non-Uniform Rational B-Spline (NURBS) modeling technology and Multi-Island Genetic Algorithm (MIGA). This method takes the coordinates of control points in the thickness direction as optimization variables and the maximization of equivalent average stress under ultimate load as the optimization objective to establish the optimization model of components. The influence of control point optimization intervals, control point arrangements, and plate splicing methods on axial mechanical properties is studied. The optimal 316 L corrugated square stub columns are fabricated using Selective Laser Melting (SLM) technology, and axial compression tests are conducted. The test results show that the failure mode changes from the middle depression of regular square tube stub columns to the bottom depression. The ultimate bearing capacity of the optimized components is increased by 53.22 %, and the deformability is improved by 69.12 %. This study verifies the feasibility of the global free-form surface shape optimization method and provides a new idea for the combination of complex thin-walled components and additive manufacturing technology.</div></div>","PeriodicalId":15557,"journal":{"name":"Journal of Constructional Steel Research","volume":"238 ","pages":"Article 110213"},"PeriodicalIF":4.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145881012","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}

{"title":"Performance-based design framework for enhancing seismic resilience of frames using dual-stage steel braces","authors":"Yutong Chen ,&nbsp;Xiao Lu ,&nbsp;Linlin Xie","doi":"10.1016/j.jcsr.2025.110216","DOIUrl":"10.1016/j.jcsr.2025.110216","url":null,"abstract":"<div><div>This study aims to investigate the seismic retrofit potential of a slip-activated dual-stage (SADS) steel bracing system for multi-story frames and to clarify how its story-wise configuration governs the resulting structural performance. To achieve this objective, a systematic optimization framework is developed to determine the effective vertical distribution of three key design parameters, including preset gap, strength ratio, and stiffness ratio. Three representative story-wise distribution strategies, namely proportional increase (PI), capacity compensation (CC), and uniform distribution (UD), are formulated to reflect different design philosophies. Nonlinear dynamic time-history analyses are conducted on multi-story frames retrofitted with SADS braces to evaluate how these distribution patterns influence peak drift response, residual drift, and collapse safety margin. The results reveal that among the investigated strategies, the UD strategy provides the most stable global response and effectively mitigates damage concentration. The CC strategy offers targeted improvement for stories with known weakness, such as soft stories, whereas the PI strategy may inadvertently induce unfavorable damage transfer along the height of the structure. With an optimally designed retrofit, the frame exhibits reductions of 49–75 % in residual drift ratios and 37–43 % in peak drift ratios, with a 13 % increase in the collapse safety margin, demonstrating significantly enhanced seismic resilience. The proposed framework offers an efficient and practically oriented methodology for the seismic retrofitting of multi-story frames with SADS braces.</div></div>","PeriodicalId":15557,"journal":{"name":"Journal of Constructional Steel Research","volume":"238 ","pages":"Article 110216"},"PeriodicalIF":4.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145881009","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}

{"title":"Mechanical properties of steel with nominal yield strength of 700 MPa at elevated temperature and after fire exposure","authors":"Weiyong Wang ,&nbsp;Yingnan Wang ,&nbsp;Zhenghao Qian","doi":"10.1016/j.jcsr.2025.110223","DOIUrl":"10.1016/j.jcsr.2025.110223","url":null,"abstract":"<div><div>The mechanical properties of high strength steel will deteriorate under fire conditions, and this deterioration is consistently observed in fire accident of steel structures. The load induces stress in the steel member, which is significant, yet often neglected in current research on post-fire mechanical properties of steel. Thus, this paper offers a comprehensive analysis of the mechanical properties of LG700 steel under fire conditions. A series of tension tests were conducted on mechanical properties at elevated temperature and after fire exposure. The tensile stress was considered in the post-fire test and the stress ratios of 0, 0.2, 0.4 and 0.7 were applied in the steel coupons. The findings indicate that both the yield strength and ultimate strength are largely preserved, maintaining approximately 80.0 % of yield strength and 86.1 % of ultimate strength up to 400 °C. The post-fire tension tests reveal that tensile stress significantly affects the residual yield strength, ultimate strength, and elastic modulus of LG700 steel only when the temperature reaches 300 °C or exceeds 700 °C. By comparing the test results with current standards and available literatures, it was found that some of the recommended values in the standards are not suitable for LG700 steel. Furthermore, it has been observed that even when steels have similar yield strengths, their post-fire mechanical properties may not necessarily align. Consequently, a series of prediction equations based on the test results have been proposed to assess the mechanical properties of LG700 steel at elevated temperature and after fire exposure.</div></div>","PeriodicalId":15557,"journal":{"name":"Journal of Constructional Steel Research","volume":"238 ","pages":"Article 110223"},"PeriodicalIF":4.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145881011","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}