Journal of Constructional Steel Research最新文献_第8页

Mechanical investigations of axially-compressed circular CFST-CG short columns strengthened by UHPC jackets UHPC护套加固轴向压缩圆形CFST-CG短柱的力学研究

IF 4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Constructional Steel Research

Pub Date : 2026-03-01 Epub Date: 2025-12-12 DOI: 10.1016/j.jcsr.2025.110162

Qihan Shen , Guanya Wang , Fengqin Wang , Jingfeng Wang , Beibei Li

Over the past several decades, gap defects were commonly detected in concrete-filled steel tubular (CFST) structures, which significantly compromise their load-bearing capacity and operational safety. Ultra-high-performance concrete (UHPC), known for its exceptional compressive strength and durability, provides a viable solution for repairing defects in CFST structures. To investigate the strengthening effect of UHPC jackets on circular CFST columns with circumferential gap defects (CFST-CG), this study establishes a finite element (FE) model for axially loaded circular CFST-CG columns strengthened with UHPC jackets, incorporating the influence of defect characteristics and interaction effects. The accuracy of the model is validated through relevant existing experiments. The influence of various parameters, comprising gap ratio (χ_cg) and ratio of inner CFST's diameter to composite column diameter (D_i/D_o, simplified as α_Di/Do), on the axial compressive behavior of circular CFST-CG short columns strengthened with UHPC jackets are analyzed. The influence mechanisms of χ_cg on failure modes, load-displacement(N-Δ) curves, interaction behavior and stress distribution are elucidated. Furthermore, design formulae are established to estimate the ultimate axial capacity of circular CFST-CG columns strengthened with UHPC jackets, accounting for the influence of χ_cg and material parameters. Results indicate that the application of UHPC jacketing circular CFST-CG short columns can significantly enhance their axial compressive capacity. However, the strengthening effectiveness exhibits notable variations with the existence and increase of the χ_cg in CFST columns. The findings can be used to directly inform the evaluation and performance restoration of CFST structures with varying gap ratios.

在过去的几十年里，钢管混凝土结构普遍存在间隙缺陷，严重影响了钢管混凝土结构的承载能力和运行安全。高性能混凝土（UHPC）以其优异的抗压强度和耐久性而闻名，为CFST结构的缺陷修复提供了可行的解决方案。为研究UHPC夹套对含周向间隙缺陷圆形CFST柱的加固效果，建立了考虑缺陷特征和相互作用影响的轴向加载UHPC夹套加固圆形CFST- cg柱的有限元模型。通过已有的相关实验验证了模型的准确性。分析了间隙比（χcg）和CFST内径与复合柱径之比（Di/Do，简化为αDi/Do）等参数对经UHPC护套加固的CFST- cg圆形短柱轴压性能的影响。分析了χcg对破坏模式、荷载-位移（N-Δ）曲线、相互作用行为和应力分布的影响机制。在此基础上，建立了考虑χcg和材料参数影响的UHPC护套加固CFST-CG圆形柱极限轴向承载力计算公式。结果表明，采用UHPC护套的圆形CFST-CG短柱可以显著提高其轴压能力。然而，加固效果随着钢管混凝土柱中χcg的存在和增加而发生显著变化。研究结果可直接指导不同间隙比的钢管混凝土结构的评价和性能恢复。

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引用次数: 0

Different strengthening strategies on progressive collapse performance of steel frames after fire 不同加固策略对钢框架火灾后连续倒塌性能的影响

IF 4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Constructional Steel Research

Pub Date : 2026-03-01 Epub Date: 2025-12-11 DOI: 10.1016/j.jcsr.2025.110192

Zhi Li , Shi-hao Wu , Kai Qian , Xi Lan

Steel frames repaired after fire show markedly different collapse behavior under extreme loads compared to ambient conditions. In this study, steel beam-column subassemblies using extended end-plate connections were initially exposed to fire. After cooling to ambient temperature, three strengthening strategies were applied to retrofit the structure. Subsequently, sudden column-removal tests were conducted to evaluate the dynamic performance after fire, followed by quasi-static pushdown tests to determine the residual collapse resistance once the dynamic effects subsided. The experimental resistance functions were then used to calibrate a refined single-degree-of-freedom (SDOF) model for predicting dynamic ultimate load. The results show that although strengthening had little effect on the maximum middle joint displacement during the dynamic phase, it effectively reduced the residual displacement in the stabilized phase by redistributing load paths and maintaining continuous participation throughout the deformation process. All strengthening strategies improved the initial stiffness of post-fire specimens, but the effect was confined to small deformations; after the first load drop, resistance rapidly deteriorated, revealing the intrinsic limitations of the strengthening mechanisms. The dynamic stiffness obtained from the middle column response was consistent with the initial stiffness from the pushdown test, indicating that using residual test data in the SDOF model is reasonable. Overall, perimeter weld strengthening demonstrated the most effective strengthening performance among the examined strategies.

火灾修复后的钢框架在极端荷载作用下的倒塌行为与环境条件下有显著差异。在这项研究中，使用扩展端板连接的钢梁柱组件最初暴露于火中。冷却至环境温度后，采用三种强化策略对结构进行改造。随后，进行了突除柱试验，以评估火灾后的动力性能；随后进行了准静态压下试验，以确定动力作用减弱后的残余抗倒塌能力。然后使用实验阻力函数来校准用于预测动态极限载荷的改进单自由度（SDOF）模型。结果表明：虽然强化对动态阶段节点中间最大位移影响不大，但通过重新分配荷载路径和保持整个变形过程的连续参与，有效减小了稳定阶段节点的残余位移；所有强化策略均能提高火灾后试件的初始刚度，但效果仅限于小变形；在第一次载荷下降后，阻力迅速恶化，揭示了强化机制的内在局限性。中柱响应得到的动刚度与下压试验得到的初始刚度基本一致，说明在SDOF模型中使用残差试验数据是合理的。总体而言，焊缝周长强化在所有强化策略中表现出最有效的强化效果。

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引用次数: 0

Load-carrying mechanism of TOBs bolted steel beam to CFST column joints TOBs螺栓连接钢梁与钢管混凝土柱节点的承载机理

IF 4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Constructional Steel Research

Pub Date : 2026-03-01 Epub Date: 2025-12-08 DOI: 10.1016/j.jcsr.2025.110150

Min Cai , Houming Yang , Le Liu , Peijun Wang , Youkun Sun

The load-carrying mechanism of Thread-fixed One-side Bolts (TOBs) bolted steel beam to Concrete-Filled Steel Tubular (CFST) column joints is rather complex due to the unique anchorage method of TOBs and the interaction between different components. Since this mechanism is challenging to observe directly through experiments, an advanced FE model was developed in this paper to numerically investigate the load-carrying mechanism of TOBs bolted steel beam to CFST column joints, including the failure of hole threads, coordination working between stiffener and column wall, contact pressure on endplate, and stress distribution of core concrete. In addition, a comprehensive parametric analysis was conducted on several parameters, such as installation gaps, concrete strength, stiffener type, and so on. Parametric studies encompassing 29 joint configurations revealed that: 1) Bolt diameter and endplate thickness critically influenced the load-carrying capacity of joints, with improvement by 24.9 % when increasing bolt diameter from M16 to M20 and by 17.35 % when changing endplate thickness from 14 mm to 20 mm; 2) H-shaped stiffener, P-stiffener with vertical rib or transverse rib demonstrated more uniform stress diffusion than polygonal counterpart through enhanced force transmission paths; 3) Spiral wire inserts can restore original capacity in thread-repaired joints by improving load distribution uniformity. Furthermore, the theoretical results and FEM values of yield bending moment for connections were well-matched, with errors no greater than 15 %.

螺纹固定单边螺栓（TOBs）连接钢管混凝土柱节点的钢梁，由于其独特的锚固方式和不同构件之间的相互作用，其受力机理较为复杂。由于这种机理难以通过实验直接观察，本文建立了一种先进的有限元模型，对TOBs螺栓钢梁与CFST柱节点的承载机理进行了数值研究，包括孔螺纹破坏、加强筋与柱壁协同工作、端板接触压力以及核心混凝土的应力分布。此外，还对安装间隙、混凝土强度、加劲筋类型等参数进行了全面的参数分析。包含29种节点配置的参数化研究表明：1)螺栓直径和端板厚度严重影响节点的承载能力，当螺栓直径从M16增加到M20时，提高了24.9%，当端板厚度从14 mm增加到20 mm时，提高了17.35%；2) h型加劲肋、竖肋p型加劲肋和横肋p型加劲肋通过增强的力传递路径，表现出比多边形加劲肋更均匀的应力扩散；3)螺旋插丝可以通过提高载荷分布均匀性来恢复螺纹修复接头的原有能力。节点屈服弯矩的理论计算结果与有限元计算结果吻合较好，误差不大于15%。

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引用次数: 0

Axial compression behavior of corrugated plate stiffened double-layer steel plate shear walls 波纹板加筋双层钢板剪力墙轴压性能研究

IF 4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Constructional Steel Research

Pub Date : 2026-03-01 Epub Date: 2025-12-13 DOI: 10.1016/j.jcsr.2025.110189

Zi-Qin Jiang , Zuo-Song Zhuang , Jun-Jie Wang , Lei Su , Mei-Lin Chen , Hu Cui

In order to improve the buckling and axial compression performance of steel plate shear wall (SPSW), this paper proposes a novel corrugated plate stiffened double-layer steel plate shear wall (CPS-DSPSW), which is formed by welding boundary columns with I-shaped wall units composed of outer steel plates and corrugated plates. To investigate axial load-bearing capacity, nine specimens were designed for axial compression tests by adjusting parameters such as wall height, outer plate thickness, corrugated plate number and layout, and concrete infill. The axial performance of different specimens was measured based on the load-equivalent vertical strain curve. The test results show that CPS-DSPSW has good axial compression bearing capacity, with failure combining global instability and local buckling. Increasing the aspect ratio of the shear wall makes it more likely to cause global instability, otherwise strength failure will occur. As the thickness of the outer steel plate increases, the effective bearing cross-sectional area increases, which improves the ultimate bearing capacity of the specimen. Corrugated plate layout has little effect on the performance, as it cannot directly resist axial compressive load. By contrast, increasing wall thickness and adding concrete significantly improve axial compression performance; concrete restrains the outer plate, limits large-area local buckling, and enhances global stability. Finally, the results of the tests in this paper are compared with the compressive stability bearing design theory of the internally stiffened double-layer steel plate shear walls with flat plate, which shows that the theory can provide a reliable basis for safe design of CPS-DSPSW.

为了提高钢板剪力墙（SPSW）的屈曲和轴压性能，本文提出了一种新型的波纹板加筋双层钢板剪力墙（CPS-DSPSW），该剪力墙由外钢板和波纹板组成的i型墙体单元焊接成边界柱。通过调整墙高、外板厚度、波纹板数量及布置、混凝土填充等参数，设计9个试件进行轴压试验，研究试件的轴压承载力。基于荷载等效垂直应变曲线测量不同试件的轴向性能。试验结果表明，CPS-DSPSW具有良好的轴压承载力，破坏形式为整体失稳与局部屈曲相结合。增大剪力墙的纵横比，更容易引起整体失稳，否则会发生强度破坏。随着外钢板厚度的增加，有效承载截面积增大，提高了试件的极限承载能力。波纹板的布置对其性能影响不大，不能直接抵抗轴向压缩载荷。增加壁厚和加入混凝土可显著提高轴压性能；混凝土抑制外板，限制大面积局部屈曲，提高整体稳定性。最后，将本文试验结果与平板内加筋双层钢板剪力墙抗压稳定承载设计理论进行了比较，表明该理论可为CPS-DSPSW的安全设计提供可靠依据。

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引用次数: 0

Compressive performance and design rule of CHS X-joints with local pitting corrosion 局部点蚀CHS x形节理抗压性能及设计规律

IF 4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Constructional Steel Research

Pub Date : 2026-03-01 Epub Date: 2026-01-02 DOI: 10.1016/j.jcsr.2025.110225

Xiaoyu Yan , Xiaohong Jian , Wenkang Zuo , Junwu Xia , Yimin Lu , Lihai Zhang , Hongfei Chang

Local pitting corrosion poses a critical threat to the structural integrity of tubular joints in marine and offshore structures, yet its effects on CHS (Circular Hollow Section) X-joints remain inadequately understood. This study experimentally and numerically investigates the compressive performance of CHS X-joints with localized pitting corrosion. Five specimens, including both uncorroded and corroded joints fabricated via precision drilling, were tested under axial compression. All joints exhibited chord plastification as the dominant failure mode, and pitting corrosion led to significant reductions in strength and stiffness, especially in joints with larger brace-to-chord diameter ratios. Validated finite element models incorporating the element birth-and-death technique were used to assess the influence of axial and circumferential corrosion positions, corrosion rate, and geometry on joint strength. Results revealed that axial corrosion near the brace-chord intersection was the most detrimental, while circumferential position played a secondary role. Based on parametric analysis and plastic yield line theory, a new design formula was proposed to predict the residual compressive strength of corroded joints, which demonstrated strong agreement with simulation results (96 % accuracy) and offered a practical tool for structural assessment and design under localized corrosion.

局部点蚀对海洋和海上结构中管状节点的结构完整性构成严重威胁，但其对CHS（圆形空心截面）x形节点的影响尚不充分了解。本文对局部点蚀CHS x形节理的抗压性能进行了实验和数值研究。在轴向压缩条件下，对5个试件进行了轴向压缩试验，其中包括未腐蚀和经精密钻孔加工的腐蚀节点。所有节点均以弦塑化为主要破坏模式，点蚀导致强度和刚度显著降低，特别是在支撑与弦直径比较大的节点。结合元素生死技术的验证有限元模型被用于评估轴向和周向腐蚀位置、腐蚀速率和几何形状对接头强度的影响。结果表明，轴向腐蚀在弦撑交点附近最为严重，周向腐蚀次之。基于参数化分析和塑性屈服线理论，提出了一种新的腐蚀节点残余抗压强度预测公式，与模拟结果吻合较好（准确率达96%），为局部腐蚀条件下的结构评估和设计提供了实用工具。

{"title":"Compressive performance and design rule of CHS X-joints with local pitting corrosion","authors":"Xiaoyu Yan , Xiaohong Jian , Wenkang Zuo , Junwu Xia , Yimin Lu , Lihai Zhang , Hongfei Chang","doi":"10.1016/j.jcsr.2025.110225","DOIUrl":"10.1016/j.jcsr.2025.110225","url":null,"abstract":"<div><div>Local pitting corrosion poses a critical threat to the structural integrity of tubular joints in marine and offshore structures, yet its effects on CHS (Circular Hollow Section) X-joints remain inadequately understood. This study experimentally and numerically investigates the compressive performance of CHS X-joints with localized pitting corrosion. Five specimens, including both uncorroded and corroded joints fabricated via precision drilling, were tested under axial compression. All joints exhibited chord plastification as the dominant failure mode, and pitting corrosion led to significant reductions in strength and stiffness, especially in joints with larger brace-to-chord diameter ratios. Validated finite element models incorporating the element birth-and-death technique were used to assess the influence of axial and circumferential corrosion positions, corrosion rate, and geometry on joint strength. Results revealed that axial corrosion near the brace-chord intersection was the most detrimental, while circumferential position played a secondary role. Based on parametric analysis and plastic yield line theory, a new design formula was proposed to predict the residual compressive strength of corroded joints, which demonstrated strong agreement with simulation results (96 % accuracy) and offered a practical tool for structural assessment and design under localized corrosion.</div></div>","PeriodicalId":15557,"journal":{"name":"Journal of Constructional Steel Research","volume":"238 ","pages":"Article 110225"},"PeriodicalIF":4.0,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145881007","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}

引用次数: 0

Beam–to–column joint solutions for reusable moment-resisting steel frames 可重复使用的抗弯矩钢框架的梁柱连接解决方案

IF 4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Constructional Steel Research

Pub Date : 2026-03-01 Epub Date: 2025-12-09 DOI: 10.1016/j.jcsr.2025.110163

Isidora Jakovljević, Jelena Dobrić, Nina Gluhović, Milan Spremić

This paper advances reusable building practices by introducing an innovative beam–to–column joint for moment-resisting steel frames. The proposed joint, featuring T-stubs and cleats, is fully demountable, employing bolted connections instead of welds. Moreover, it is designed to accommodate reclaimed steel, incorporating an adaptable link that extends the service length of existing members and adjusts them to the required span of a new structure. Experimental testing was conducted on three test specimens to evaluate joint performance and identify failure modes, moment resistance, rotation capacity and stiffness. Two joint configurations were tested, varying the T-stub section and number of bolts on the T-stub web–to–beam flange connection. Additionally, the influence of material origin, reclaimed versus new steel, was investigated through two specimens with identical configurations. Testing revealed two failure modes: bearing deformation at bolt holes in the T-stub web and failure of the first bolt row on the column flange. Results also highlighted the critical role of bolt slip resistance on the T-stub web–to–beam flange connection in governing the rotational stiffness. Finite element models were developed and validated against the experimental results to simulate the mechanical behaviour of the joints. A parametric numerical study explored key design variables, including link length, bolt diameter, and number of bolts. The findings contributed to improving the joint structural performance by increasing its resistance and delaying the stiffness degradation. Results indicated that increasing the link length from 100 to 150 mm does not have a negative effect on the joint performance.

本文通过引入一种创新的抗弯矩钢框架的梁柱节点，提出了可重复使用的建筑实践。提议的接头，具有t型桩和cleats，是完全可拆卸的，采用螺栓连接而不是焊接。此外，它的设计是为了容纳再生钢，结合一个可适应的连接，延长现有成员的使用长度，并调整它们以适应新结构所需的跨度。对3个试件进行试验测试，评估节点性能，识别节点破坏模式、弯矩抗力、转动能力和刚度。测试了两种连接形式，分别改变了t形短段的截面和t形短段腹板到梁的法兰连接上的螺栓数量。此外，通过两个具有相同结构的试样，研究了材料来源（再生钢与新钢）的影响。试验发现了两种破坏模式：t形腹板螺栓孔的承载变形和柱翼缘第一排螺栓的破坏。结果还强调了螺栓抗滑移在t型短板-梁法兰连接中对控制旋转刚度的关键作用。建立了有限元模型，并根据实验结果进行了验证，以模拟节点的力学行为。参数化数值研究探讨了关键的设计变量，包括连杆长度、螺栓直径和螺栓数量。研究结果有助于提高节点的结构性能，增加节点的阻力，延缓节点的刚度退化。结果表明，将连接长度从100 mm增加到150 mm对连接性能没有负面影响。

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引用次数: 0

Effects of pretensioning on the Z Block modular column-to-column connection 预张紧对Z块模块柱对柱连接的影响

IF 4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Constructional Steel Research

Pub Date : 2026-03-01 Epub Date: 2025-12-31 DOI: 10.1016/j.jcsr.2025.110214

Ayotunde Giwa , Sreekanta Das , Hossein Ghaednia , Jothiarun Dhanapal

This study investigates the effects of bolt pretensioning on the column-to-column connection made of the Z Block connector under tensile axial load. Five full-scale specimens, comprising of various pretension levels (30, 50, 61.5, 70, and 85 kips) were tested under Axial Tension Single Column (ATSC) connection. The failure mode in all specimens was the rupture of the Socket-Head-Cap-Screws (SHCSs) that connect the lower and upper block components of the Z Block. Experimental tests showed that there was a decrease in block separation and tensile capacity as bolt pretension was increased. Notably, specimen with 61.5 kips pretension was adopted as the optimal design pretension level for the Z Block connector. The specimen showed an 82 % reduction in block separation and only a 6.7 % reduction in tensile capacity in comparison to specimen with no pretension applied. Test validation and parametric study was subsequently carried out using finite element analysis to investigate other level of pretension as well as identifying the alternate design pretension level for the Z Block connector. The results of the numerical analysis showed that a pretension preload of 245 kN (55 kips) resulted in a further decrease of 0.23 mm in block separation, while maintaining a 24 % increase in tensile capacity compared to the optimal preload obtained from the experimental test.

本研究探讨了在轴向拉伸荷载作用下，螺栓张紧对Z块接头柱对柱连接的影响。在轴向拉伸单柱（ATSC）连接下测试了5个全尺寸试件，包括不同的预张力水平（30、50、61.5、70和85 kips）。所有试件的破坏模式均为连接Z块上下组件的内六角螺钉（SHCSs）破裂。试验结果表明，随着锚杆预紧力的增大，锚杆的块体分离率和抗拉能力均有所降低。值得注意的是，采用61.5 kips预张力试件作为Z座连接器的最佳设计预张力水平。与未施加预张力的试样相比，试样的块分离减少了82%，拉伸能力仅减少了6.7%。随后，利用有限元分析进行了测试验证和参数化研究，以研究其他预张力水平，并确定Z Block连接器的替代设计预张力水平。数值分析结果表明，245 kN （55 kips）的预紧力使块体间距进一步减小0.23 mm，同时与实验测试获得的最佳预紧力相比，拉伸能力保持了24%的提高。

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引用次数: 0

Corrigendum to “Axial compression behaviors of aluminium tubular columns exposed to low-temperature environment” [Journal of Constructional Steel Research 235 (2025) 109784] “低温环境下铝管柱的轴向压缩性能”的勘误表[结构钢研究杂志235 (2025)109784]

IF 4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Constructional Steel Research

Pub Date : 2026-03-01 Epub Date: 2025-12-10 DOI: 10.1016/j.jcsr.2025.110193

Jia-Bao Yan , Jin-Ping Zhao , Yu-Cai Zhao , Yun-Biao Luo , Ming Li

引用次数: 0

A ductile shear connector for U-shaped composite girders: From concept to design 一种用于u形复合梁的韧性剪切接头：从概念到设计

IF 4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Constructional Steel Research

Pub Date : 2026-03-01 Epub Date: 2025-12-26 DOI: 10.1016/j.jcsr.2025.110203

Xin-Yu Zhao, Zhou-Zi Chu, Shi Zeng, Wei-Tian Lu, Bo Wu

U-shaped steel–concrete composite girders have gained increasing attention in modern structural applications due to their construction efficiency, favorable rigidity, and high strength-to-weight ratio. The overall composite action of such systems, however, largely depends on the performance of the shear connectors that transfer longitudinal shear forces between the steel U-section and the concrete. Conventional welded angle connectors, though capable of providing high initial stiffness, are prone to brittle tearing at the weld toes and suffer from residual stresses and fabrication challenges. To overcome these limitations, this study presents a proof-of-concept investigation into bolted angle connectors as a ductile and construction-friendly alternative. Seventeen push-out tests and a suite of validated finite-element simulations were conducted to evaluate the effects of geometric, material, and construction parameters on shear transfer, deformation, and resistance. Two distinct failure modes were identified: (i) combined angle plasticity and bolt shear failure (Mode I) and (ii) pure bolt shear failure (Mode II). Specimens with large bolt diameter-to-angle thickness ratios (d/t > 4) developed a dual-hinge mechanism, in which two plastic hinges formed in the bolted and vertical legs. This mechanism embodies the capacity-design principle, enabling sustained rotation, delayed bolt fracture, and gradual post-peak response. In particular, its resulting slip capacity readily satisfied the 6 mm ductility criterion of Eurocode 4, thereby qualifying these connectors as ductile. A power-law regression model was developed to relate the connector shear resistance to geometric and material parameters, and a flange-corrected version was proposed to account for the flange effects of thin-walled U-sections. Both formulations demonstrated good predictive accuracy.

钢-混凝土组合梁以其施工效率高、刚度好、强重比高等特点在现代结构应用中越来越受到重视。然而，这些系统的整体复合作用在很大程度上取决于剪切连接件的性能，这些连接件在钢u形截面和混凝土之间传递纵向剪力。传统的焊接角连接器虽然能够提供较高的初始刚度，但在焊接脚趾处容易发生脆性撕裂，并且存在残余应力和制造挑战。为了克服这些限制，本研究提出了一项概念验证研究，将螺栓角连接器作为延展性和施工友好的替代方案。进行了17次推出试验和一套经过验证的有限元模拟，以评估几何、材料和施工参数对剪切传递、变形和阻力的影响。确定了两种不同的破坏模式：(i)角塑性与锚杆剪切联合破坏（模式i）和（ii）纯锚杆剪切破坏（模式ii）。大螺栓径角厚度比（d/t > 4）试件呈现双铰机制，即在螺栓和垂直支腿中形成两个塑性铰。这种机制体现了能力设计原则，能够实现持续旋转、延迟螺栓断裂和逐渐的峰后响应。特别是，其产生的滑移能力很容易满足欧洲规范4的6毫米延性标准，从而使这些连接器具有延性。建立了一个幂律回归模型，将连接器的抗剪能力与几何参数和材料参数联系起来，并提出了一个法兰修正模型，以考虑薄壁u型截面的法兰效应。两种公式都显示出良好的预测准确性。

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引用次数: 0

Numerical investigation of a new bolted moment connection for cold-formed steel frames 冷弯型钢框架一种新型螺栓弯矩连接的数值研究

IF 4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Constructional Steel Research

Pub Date : 2026-03-01 Epub Date: 2025-12-13 DOI: 10.1016/j.jcsr.2025.110153

Hamed Naserirad, Yousef Hosseinzadeh

This paper presents a numerical study and development of a new bolted connection in cold-formed steel frames. An improved numerical simulation method was developed and validated against experimental data for the bolted moment connections with a through plate. The optimal geometric dimensions of the new bolted connection are determined using numerical methods to investigate the seismic performance of the proposed connection. The new bolted moment connection is semi-rigid, with a ductility ratio ranging from 3.61 to 4.39. Additionally, the damping ratio varies from 33.52 % to 37.24 % in the cycle with maximum bending moment capacity and from 35.53 % to 43.06 % in the final cycle. This connection overcomes the complexity of manufacturing double-sided through-plates and the limitations of construction in frames with more than one story.

本文对一种新型冷弯型钢框架螺栓连接方式进行了数值研究和开发。提出了一种改进的贯通板螺栓弯矩连接数值模拟方法，并与实验数据进行了对比验证。采用数值方法确定了新型螺栓连接的最佳几何尺寸，研究了该连接的抗震性能。新型螺栓弯矩连接为半刚性连接，延性比为3.61 ~ 4.39。在最大弯矩承载力周期内，阻尼比在33.52% ~ 37.24%之间，在最后一个周期内，阻尼比在35.53% ~ 43.06%之间。这种连接克服了制造双面通板的复杂性和多层框架结构的局限性。

引用次数: 0