Journal of Constructional Steel Research最新文献_第4页

Evolution of ultimate pressure of randomly corroded pipes based on stochastic numerical analysis and CNN 基于随机数值分析和CNN的随机腐蚀管道极限压力演化

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

Journal of Constructional Steel Research

Pub Date : 2026-05-01 Epub Date: 2026-02-05 DOI: 10.1016/j.jcsr.2026.110276

Ni Zhang , Pengyuan Li , Zhongwei Zhao , Zhancai Lao

Research on corroded pressure pipelines is of great importance, given their critical role in industries including oil and gas, chemical processing, water distribution, and power generation. Corrosion is among the most detrimental factors impacting pressure pipeline safety. Via stochastic finite element analysis, this study explores the degradation law of external ultimate pressure for randomly corroded pipelines concerning the mass loss rate χ. It also examines the effect of axial loading on the radial pressure of such pipelines and clarifies how geometric dimensions (characterized by diameter-to-thickness ratio) and material yield strength impact their ultimate radial compressive bearing capacity. Furthermore, a reduction coefficient is proposed to quantify the degradation of corroded pipelines' ultimate compressive bearing capacity. Results show that the study's conclusions apply to pressure pipelines of various strength grades. Meanwhile, a theoretical simplified formula for the reduction coefficient—covering the range of diameter-to-thickness ratios commonly used in engineering practice—is established. Moreover, an optimized convolutional neural network (CNN) is introduced to effectively predict the reduction coefficient for corroded pipelines with varying diameter-to-thickness ratios. Overall, this research lays a foundation for the safety assessment of corroded pressure pipelines.

由于压力管道在油气、化工、配水、发电等行业中起着至关重要的作用，因此对腐蚀压力管道的研究具有重要意义。腐蚀是影响压力管道安全的最不利因素之一。通过随机有限元分析，探讨了随机腐蚀管道外极限压力随质量损失率χ的退化规律。它还研究了轴向载荷对此类管道径向压力的影响，并阐明了几何尺寸（以直径与厚度比为特征）和材料屈服强度如何影响其最终径向压缩承载能力。此外，还提出了一个折减系数来量化腐蚀管道极限抗压承载力的退化。结果表明，研究结论适用于各种强度等级的压力管道。同时，建立了涵盖工程实践中常用的径厚比范围的理论简化折减系数公式。此外，引入优化的卷积神经网络（CNN），对不同径厚比腐蚀管道的折减系数进行有效预测。研究结果为腐蚀压力管道的安全评价奠定了基础。

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引用次数: 0

Simulation-based 4R fatigue assessment of high-frequency mechanical impact treated welded joints 基于仿真的高频机械冲击处理焊接接头4R疲劳评估

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

Journal of Constructional Steel Research

Pub Date : 2026-05-01 Epub Date: 2026-01-31 DOI: 10.1016/j.jcsr.2026.110263

Tero Pesonen , Jani Riski , Kalle Lipiäinen , Antti Ahola , Martin Leitner , Tuomas Skriko

High-frequency mechanical impact (HFMI) treatment improves the fatigue strength of welded joints by compressive residual stresses, improved local geometry, and strain hardening, which can be considered in fatigue predictions using the 4R method. This study investigates the applicability of a simulation-based fatigue assessment model to HFMI-treated longitudinal stiffener joints. The finite element (FE) simulation of fabrication and cyclic loading integrates computational weld mechanics (CWM), material prediction in the heat-affected zone (HAZ), HFMI treatment simulation, and cyclic material response analysis under mechanical loading. The fatigue assessments were carried out using the multiparametric fatigue analysis, the 4R method, which employs FE-simulated material local stress responses. The simulation results were experimentally validated through geometry and residual stress measurements, hardness characterizations, and fatigue tests, showing a reasonably good agreement with the experimental findings. The simulation-based fatigue life values showed good agreement with experimental results at the low stress ratio (R = 0.1), with simulation-based predictions being slightly conservative. At a higher stress ratio (R = 0.5), the simulation-based model, with simplifications, was not able to capture all fatigue characteristic factors of the specimen, predicting non-conservative capacity for the HFMI-treated joint compared to the experimental data. Nevertheless, simulation models are an effective tool for estimating the local fatigue-effective stresses and strains for HFMI-treated joints in validated and applicable ranges of load conditions, and offer a cost-effective alternative to experimental specimen fabrication and fatigue testing.

高频机械冲击（HFMI）处理通过压缩残余应力、改善局部几何形状和应变硬化来提高焊接接头的疲劳强度，这些可以在使用4R方法进行疲劳预测时加以考虑。本研究探讨了基于仿真的疲劳评估模型对hfmi处理的纵向加强筋节点的适用性。制造和循环加载的有限元（FE）模拟集成了计算焊接力学（CWM）、热影响区（HAZ）材料预测、HFMI处理模拟和机械加载下材料循环响应分析。采用有限元模拟材料局部应力响应的4R多参数疲劳分析方法进行疲劳评估。通过几何和残余应力测量、硬度表征和疲劳试验验证了模拟结果，结果与实验结果吻合较好。在低应力比（R = 0.1）下，基于仿真的疲劳寿命值与实验结果吻合较好，但基于仿真的预测结果略保守。在较高的应力比（R = 0.5）下，基于模拟的模型经过简化后，无法捕捉到试样的所有疲劳特征因素，与实验数据相比，预测了hfmi处理后关节的非保守能力。尽管如此，模拟模型是在验证和适用的载荷条件范围内估计hfmi处理的关节的局部疲劳有效应力和应变的有效工具，并且提供了一种具有成本效益的替代实验样品制作和疲劳测试。

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引用次数: 0

A theoretical model of bending–torsion coupling behavior for curved composite box girders with corrugated steel webs 波纹钢腹板弯曲组合箱梁弯扭耦合特性的理论模型

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

Journal of Constructional Steel Research

Pub Date : 2026-04-01 Epub Date: 2026-01-08 DOI: 10.1016/j.jcsr.2025.110220

Chang Wei Yao , Chun Sheng Wang , Wen Ting Zhang

This study develops a novel theoretical model based on rotational shell theory for analyzing elastic bending-torsion coupling in curved composite box-girders with corrugated steel webs (CCBG-CSWs). The model incorporates key factors including initial curvature and its transverse variation, shear deformation, and the flexural contribution of the webs, with its accuracy confirmed by experimental and numerical validations. The results demonstrate that the bending-torsion coupling intensifies within specific parameter ranges: a span-to-radius ratio exceeding 0.6, a radius-to-width ratio below 10, or a bending-to-torsion stiffness ratio exceeding 10. Under centerline loading, restrained torsion warping normal stress remains below 5.0 %, with negligible shear-lag effects. Inboard eccentric loading, however, reduces coupling while increasing distortional warping stress. Compared to flat steel webs, corrugated steel webs significantly reduce flexural stiffness, primarily due to the wrinkling effect, with minimal impact on torsional stiffness. Although the increased vertical shear area offers some compensation, it is insufficient to fully restore the flexural stiffness. Furthermore, incorporating the shear deformation of corrugated steel webs increases vertical deflection by 5.3 % without significantly increasing torsional angle or normal stress. Finally, accounting for their flexural contribution further reduces normal stress by 4.5 %. In summary, this study provides a robust theoretical method and critical insights for analyzing and optimizing CCBG-CSWs.

基于旋转壳理论，建立了波纹钢腹板弯曲复合箱梁弹性弯扭耦合分析的理论模型。该模型考虑了初始曲率及其横向变化、剪切变形和腹板受弯贡献等关键因素，并通过实验和数值验证验证了模型的准确性。结果表明，在特定参数范围内，即当跨径比大于0.6、半径比小于10、弯扭刚度比大于10时，弯扭耦合会增强。在中心线加载下，约束扭转翘曲法向应力保持在5.0%以下，剪切滞后效应可以忽略不计。然而，内侧偏心加载减少了耦合，同时增加了扭曲翘曲应力。与扁平钢腹板相比，波纹钢腹板显著降低弯曲刚度，这主要是由于起皱效应，而对扭转刚度的影响最小。虽然增加的竖向剪切面积提供了一定的补偿，但不足以完全恢复抗弯刚度。此外，结合波纹钢腹板的剪切变形增加了5.3%的垂直挠度，而没有显著增加扭转角或法向应力。最后，考虑到它们的弯曲贡献，进一步降低了4.5%的正常应力。总之，本研究为CCBG-CSWs的分析和优化提供了强有力的理论方法和重要见解。

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引用次数: 0

Numerical investigation of extremely low-cycle fatigue behavior in cylindrical steel specimens 圆柱钢试件极低周疲劳行为的数值研究

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

Journal of Constructional Steel Research

Pub Date : 2026-04-01 Epub Date: 2026-01-19 DOI: 10.1016/j.jcsr.2026.110247

Yoshiharu Sato , Suguru Itabashi , Yu Jiao , Satoshi Yamada

In extremely low-cycle fatigue (ELCF) tests using cylindrical specimens, localized necking deformation occurs, resulting in a non-uniform stress and strain state in the gauge section. Consequently, fatigue life is affected by gauge length. This effect impacts not only the fracture life but also the fatigue life up to the onset of strength degradation, which can be defined as the damage-initiation fatigue life. In this study, finite element analysis (FEA) was employed to examine the stress and strain state within a cylindrical specimen under ELCF conditions and investigate the influence of gauge length on the damage-initiation fatigue life. FEA was conducted based on two existing ELCF test methods using 490 N/mm² grade steel with different gauge lengths and strain amplitudes ranging from 3% to 12%. Two material constitutive models capable of accurately reproducing the stress–strain behavior under constant-strain-amplitude cyclic loading were employed. At the specimen center—where the fracture initiates under ELCF conditions—the mean strain shifted toward the tensile side as the number of cycles increased and the strain amplitude exceeded the controlled strain amplitude measured between the gauge points. Furthermore, the shift in mean strain and the increase in strain amplitude were more pronounced in specimens with longer gauge lengths. The influence of gauge length on fatigue life can generally be assessed by evaluating the damage-initiation fatigue life using the rain-flow counting method and Miner's linear cumulative damage rule applied to the strain history at the specimen center.

在使用圆柱形试样的极低周疲劳（ELCF）试验中，会发生局部颈缩变形，导致规范截面的应力和应变状态不均匀。因此，疲劳寿命受量规长度的影响。这种效应不仅影响断裂寿命，而且影响强度退化开始前的疲劳寿命，可定义为损伤起裂疲劳寿命。本研究采用有限元分析方法对ELCF条件下圆柱形试样的应力应变状态进行了研究，探讨了规长对损伤起裂疲劳寿命的影响。基于现有的两种ELCF试验方法，采用490n /mm2级钢，在应变幅值为3% ~ 12%的情况下，采用不同的应变长度和应变幅值进行有限元分析。采用了两种材料本构模型，能够准确再现等应变幅值循环加载下的应力-应变行为。在试样中心（ELCF条件下断裂开始的地方），随着循环次数的增加，平均应变向拉伸侧移动，应变幅值超过了测量点之间的控制应变幅值。此外，应变的平均位移和应变幅度的增加在较长的试件中更为明显。试件长度对疲劳寿命的影响一般可以通过采用雨流计数法和Miner线性累积损伤规则对试件中心应变历史进行损伤起爆疲劳寿命评估来评估。

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引用次数: 0

Fire resistance of beam-to-column fully welded connection joint in steel frame 钢框架梁柱全焊接连接节点的耐火性能

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

Journal of Constructional Steel Research

Pub Date : 2026-04-01 Epub Date: 2026-01-06 DOI: 10.1016/j.jcsr.2025.110230

Shenggang Fan , Lizhi Hu , Tiangui Xu , Yiwen Wu , Shengjie Duan

Full-scale fire tests were conducted on fully welded connection joints in steel frames (FWC-SF) to investigate the effects of load ratio and fireproof coating on the fire resistance, critical temperature, and failure modes. Three specimens were tested, the temperature distributions and deformation responses under fire exposure were obtained. The results indicated that the heating rates of FWC-SF joint components varied, while fireproof coating could mitigate these differentials. Local buckling of the highly heated steel beam bottom flange and web was identified as the fundamental cause of joint failure, with the beam load ratio being the dominant factor affecting fire resistance. Finite element (FE) models were developed and reproduced the temperature field and fire performance of FWC-SF joints as recorded. A series of parametric studies was performed, revealing a threshold effect of column load ratio on fire resistance, and acquiring reduction factors for the initial rotational stiffness and ultimate bending moment of the FWC-SF joint at elevated temperatures. At 600 °C, the ultimate moment decreases by about 50 %, while the initial rotational stiffness is reduced to 15 %, and the FWC-SF joints nearly lose rotational stiffness above 700 °C.

以全焊接钢框架（FWC-SF）为研究对象，进行了全焊接连接节点的全尺寸火灾试验，研究了载荷比和防火涂层对全焊接连接节点的耐火性能、临界温度和破坏模式的影响。对3个试件进行了测试，得到了火灾作用下的温度分布和变形响应。结果表明，FWC-SF接头构件的升温速率存在差异，而防火涂层可以缓解这种差异。发现高温下钢梁底部翼缘和腹板局部屈曲是节点破坏的根本原因，梁载比是影响耐火性的主要因素。建立了FWC-SF节点的有限元模型，并对记录的温度场和防火性能进行了模拟。通过一系列参数研究，揭示了柱载比对耐火性能的阈值效应，并获得了高温下FWC-SF节点初始转动刚度和极限弯矩的折减系数。在600℃时，极限弯矩减小约50%，初始转动刚度减小至15%，在700℃以上，FWC-SF节点几乎失去转动刚度。

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引用次数: 0

Enhanced Radial Stress Method (RSM) for cellular beams in EN 1993-1-13 to account for elasto-plastic behaviour EN 1993-1-13中用于计算弹塑性性能的蜂窝梁的增强径向应力法（RSM）

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

Journal of Constructional Steel Research

Pub Date : 2026-04-01 Epub Date: 2026-01-05 DOI: 10.1016/j.jcsr.2025.110221

Georgios Psyrras , Konstantinos Daniel Tsavdaridis , R. Mark Lawson

In cellular beams with circular openings, Vierendeel bending failure is caused by the local bending around the web openings in regions of high shear. In BS EN 1993-1-13, a Radial Stress Method (RSM) is presented, which is based either on the elastic resistance of the inclined T-sections around the openings or on their plastic bending resistance dependent on the section classification of the inclined T-section, which results in a step between elastic and plastic properties. The RSM method also fails to account for stress redistribution between the lower moment side and the higher moment side of openings. This study investigates the RSM for circular openings in a typical UB 457x152x52 beam, that is modelled and analysed using Abaqus. The RSM is extended to an elasto-plastic analysis of the inclined T-sections that gives a way of evaluating the development of the Vierendeel bending mechanism and may be used for slender webs. The elasto-plastic analysis around the openings subject to axial force, shear and bending is based on a multiple of the yield strain at the edge of the opening. This is compared to the non-linear FEA results, which show good agreement for the stress distribution around the openings on the lower moment and higher moment sides of the openings for all combinations of applied shear and moment. The results of the method are also compared to cellular beam tests results failing in Vierendeel bending.

在具有圆形开口的单元格梁中，在高剪切区腹板开口周围的局部弯曲引起了竖向梁的弯曲破坏。在BS EN 1993-1-13中，提出了径向应力法（RSM），该方法要么基于开口周围倾斜t形截面的弹性阻力，要么基于依赖于倾斜t形截面分类的塑性弯曲阻力，从而导致弹性和塑性性能之间的一个步骤。RSM方法也不能解释开口的低弯矩侧和高弯矩侧之间的应力重新分布。本研究调查了典型的UB 457x152x52梁的圆形开口的RSM，并使用Abaqus进行建模和分析。RSM扩展到斜t型截面的弹塑性分析，提供了一种评估纵向弯曲机制发展的方法，并可用于细长腹板。受轴向力、剪切和弯曲作用的孔口周围的弹塑性分析是基于孔口边缘屈服应变的倍数。这与非线性有限元分析结果相比较，结果表明，在所有施加剪切和力矩的组合下，开口的低弯矩侧和高弯矩侧的应力分布与开口周围的应力分布很一致。并将该方法的结果与蜂窝梁试验结果进行了比较。

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引用次数: 0

Diagonal-extremum model for shear strength in double steel plate-concrete composite shear wall 双钢板-混凝土组合剪力墙抗剪强度的对角极值模型

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

Journal of Constructional Steel Research

Pub Date : 2026-04-01 Epub Date: 2026-01-10 DOI: 10.1016/j.jcsr.2025.110226

Wentao Liang , Yuanlong Yang , Jian Zhang , Xiangsheng Chen , Xiong Peng , Yohchia Frank Chen

The double steel plate-concrete composite shear wall (DSCW) is a promising structure for high-rise buildings due to its excellent performance and construction efficiency. This study proposes a novel theoretical model, diagonal-extremum model, to accurately predict the shear strength of DSCW. The model is developed through mechanical analysis and the Lagrange multiplier method. Validation against 24 experimental results demonstrates its high accuracy, with an average calculated-to-tested strength ratio of 0.94 and a standard deviation of 6.9 %. Furthermore, a comprehensive finite element (FE) analysis involving 600 models confirms the model's superiority over the current Chinese code (JGJ 380–2015), showing that our model achieves a prediction error within ±15 % for 94 % of the cases, significantly outperforming the code method. The proposed model provides a more reliable and theoretically sound tool for the design and analysis of DSCW.

双钢板-混凝土组合剪力墙以其优异的性能和施工效率，是一种很有发展前途的高层建筑结构形式。本文提出了一种新的理论模型——对角极值模型，以准确地预测DSCW的抗剪强度。通过力学分析和拉格朗日乘数法建立了该模型。对24个试验结果的验证表明，该方法具有较高的准确性，平均计算强度比为0.94，标准偏差为6.9%。此外，涉及600个模型的综合有限元（FE）分析证实了该模型优于现行中国规范（JGJ 380-2015），表明我们的模型在94%的情况下实现了±15%的预测误差，显著优于代码方法。所提出的模型为DSCW的设计和分析提供了一个更可靠和理论上合理的工具。

引用次数: 0

Study on the global stability of members strengthened with outer sleeves 外套管加固构件整体稳定性研究

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

Journal of Constructional Steel Research

Pub Date : 2026-04-01 Epub Date: 2026-01-21 DOI: 10.1016/j.jcsr.2026.110250

Zeyuan Jin , Yunbo Yang , Jinghai Yu , Bin Wang , Shuangqiu Cao , Zhongwei Zhao

This paper presents a prefabricated outer-sleeve strengthening method to address buckling of compression members in space structures. Eleven axial compression specimens and accompanying numerical analyses investigate the influence of key parameters on global stability. Results show that sleeve reinforcement significantly increases the ultimate bearing capacity, and failure modes are dominated by buckling at the middle span and sleeve slippage. It is revealed that rational hoop spacing is critical for preventing capacity degradation, and an optimal configuration is identified to ensure effective composite action. Finite-element analyses indicate that increasing geometric dimensions such as sleeve thickness and outer diameter effectively enhances the capacity through increased moment of inertia. Furthermore, the sensitivity of the strengthened members to initial imperfections is quantified. Theoretical derivations demonstrate that the lateral restraint provided by the sleeve significantly reduces the equivalent slenderness ratio, confirming that lateral restraint governs stability improvement. Based on the small-deflection theory and static equilibrium conditions, the prediction formula for the ultimate capacity of sleeved reinforced members is derived. Verification results demonstrate good agreement between the theoretical predicted values and experimental values. The findings offer a theoretical basis for engineering practice.

针对空间结构中受压构件的屈曲问题，提出了一种预制外套筒加固方法。11个轴压试件及相应的数值分析研究了关键参数对整体稳定性的影响。结果表明：套筒加固显著提高了极限承载力，破坏模式以跨中屈曲和套筒滑移为主；研究表明，合理的环箍间距是防止能力退化的关键，并确定了最佳配置，以确保有效的复合作用。有限元分析表明，增大轴套厚度和外径等几何尺寸可通过增加转动惯量有效提高承载能力。此外，还量化了加固构件对初始缺陷的敏感性。理论推导表明，套筒的侧向约束显著降低了等效长细比，证实了侧向约束对稳定性提高的影响。基于小挠度理论和静力平衡条件，推导出套式加筋构件极限承载力的预测公式。验证结果表明，理论预测值与实验值吻合较好。研究结果为工程实践提供了理论依据。

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引用次数: 0

Experimental study on frame-supported cold-formed thin-walled steel structure 框架支撑冷弯薄壁钢结构试验研究

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

Journal of Constructional Steel Research

Pub Date : 2026-04-01 Epub Date: 2026-01-15 DOI: 10.1016/j.jcsr.2026.110235

Yuxuan Zou , Rui Wei , Yu Shi , Xinmei Yao

A series of tests and numerical analyses were conducted in this study to investigate the seismic performance of frame-supported cold-formed thin-walled steel structures (FCTSS). The FCTSS consists of two parts. The lower part was reinforced concrete or steel frame, and the upper part was comprised of cold-formed thin-walled steel walls. The variables include the lower frame type, interstory stiffness ratio, vertical load, and screw spacing. The experimental and numerical results reveal that all lower frames remained elastic without visible damage, while the upper walls experienced severe damage, involving corner crushing, rigid rotation, and out-of-plane buckling of Oriented Strand Board (OSB) panels. Compared with walls supported by steel frames, walls supported by reinforced concrete frames demonstrated slightly higher yield and peak loads, whereas the ductility decreased. The increase in the stiffness of the lower frame exerted a negligible impact on the seismic response of the upper walls. Notably, reducing the perimeter screw spacing significantly improved the cyclic behavior of upper walls.

本文对框架支撑冷弯薄壁钢结构（FCTSS）的抗震性能进行了一系列试验和数值分析。FCTSS由两部分组成。下部为钢筋混凝土或钢框架，上部为冷弯薄壁型钢墙。变量包括下框架类型、层间刚度比、垂直荷载和螺钉间距。实验和数值结果表明，所有下部框架均保持弹性，无明显损伤，而上部墙体则遭受严重损伤，包括角压、刚性旋转和定向刨花板（OSB）板的面外屈曲。与钢框架支撑的墙体相比，钢筋混凝土框架支撑的墙体屈服和峰值荷载略高，但延性有所下降。下框架刚度的增加对上墙的地震反应的影响可以忽略不计。值得注意的是，减小周长螺杆间距可以显著改善上部壁面的循环性能。

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引用次数: 0

Axial compressive capacity of volcanic scoria concrete-filled circular steel tube stub columns 火山渣圆钢管混凝土短柱轴压承载力研究

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

Journal of Constructional Steel Research

Pub Date : 2026-04-01 Epub Date: 2026-01-07 DOI: 10.1016/j.jcsr.2026.110233

Bin Cai , Yuyan Wang , Lixiang Zhang , Lin Wang , Feng Fu

In this paper, lightweight concrete with different volcanic scoria coarse aggregate (VSCA) replacement ratios (0 %, 25 %, 50 %, 75 %, 100 %) into steel tube of varying wall thicknesses (2.5 mm, 3 mm, 4 mm), 15 volcanic scoria concrete-filled steel tube (VSCFST) stub column specimens were tested. A systematic study was conducted on the effects of VSCA replacement ratios and steel ratios (6.35 %, 7.69 %, 10.45 %) on their axial compressive capacity. The test results demonstrated that when the VSCA replacement ratio ≤ 50 % and the steel tube wall thickness ≥ 4 mm, the specimens primarily exhibit mid-section buckling failure; when the VSCA replacement ratio ≥ 75 % or the wall thickness ≤ 3 mm, the specimens are prone to end-section shear failure. As the VSCA replacement ratio increases, the ultimate load capacity, elastic stiffness, and ductility of the specimens all show a decreasing trend; however, increasing the wall thickness of steel tube can effectively enhance these mechanical properties. This phenomenon can be attributed to the incorporation of VSCA weakening the synergistic effect between concrete and steel tube. Additionally, the reliability of the finite element model developed in Abaqus software was validated using the test results, followed by a comprehensive parameter analysis. Finally, the applicability of current design codes was verified by comparing experimental data, and a modified ultimate load capacity calculation formula considering the VSCA replacement ratios and steel tube confinement effect was developed. This formula predicts the ultimate load capacity of VSCFST stub columns with a deviation within 5 % from the experimental values.

本文采用不同火山渣粗骨料（VSCA）替代率（0%、25%、50%、75%、100%）的轻混凝土替代不同壁厚（2.5 mm、3 mm、4 mm）钢管，对15个火山渣粗骨料钢管混凝土（VSCFST）短柱试件进行了试验研究。系统研究了VSCA替代率和配钢率（6.35%、7.69%、10.45%）对其轴压能力的影响。试验结果表明：当VSCA替换率≤50%，钢管壁厚≥4 mm时，试件主要表现为中部屈曲破坏；当VSCA替换率≥75%或壁厚≤3 mm时，试件易发生端段剪切破坏。随着VSCA替换率的增大，试件的极限承载能力、弹性刚度和延性均呈下降趋势；而增加钢管的壁厚可以有效地提高这些力学性能。这一现象可归因于VSCA的掺入削弱了混凝土与钢管之间的协同作用。利用试验结果验证了Abaqus有限元模型的可靠性，并进行了综合参数分析。最后，通过对比试验数据验证了现行设计规范的适用性，并建立了考虑VSCA替代比和钢管约束效应的极限承载力修正计算公式。该公式预测了VSCFST短柱的极限承载能力，与实验值的偏差在5%以内。

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引用次数: 0