Journal of Constructional Steel Research最新文献_第6页

Seismic performance of joints for a novel composite beam and cruciform thin concrete encased steel column 新型组合梁-十字形薄混凝土包钢柱节点抗震性能研究

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

Journal of Constructional Steel Research

Pub Date : 2026-01-08 DOI: 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.

本文提出了一种新型组合梁与十字形薄混凝土包钢柱的连接方式。组合梁的h型钢骨架由两种钢组合而成，底部钢为倒t形，顶部钢为t形，仅用于梁承受负弯矩。这两个钢构件在腹板处由高强度螺栓连接。在钢腹板中引入矩形开口，以增强梁和板之间的剪切相互作用，同时也便于管道和钢筋的通过。在拟静力荷载作用下，对3个全尺寸试件进行了试验，以评估螺柱布置和螺栓孔尺寸对节点抗震性能的影响。试验研究了破坏模式、裂纹扩展、滞后响应、能量耗散、刚度退化和应变分布。结果表明，该节理具有良好的抗震性能。在强震作用下，通过翼缘滑移和板块变形实现能量耗散。矩形腹板开口有效地增强了梁与板之间的复合作用。顶部法兰上的螺柱可以缓解面板过早开裂，而细长的螺栓孔可以在不降低承载能力的情况下防止滑动变形。在验证的有限元模型基础上，进一步进行了参数化研究，考察了轴压比、螺栓数量、悬臂梁底部翼缘厚度和组合梁构型对节点抗震性能的影响。最后，建立了节点屈服弯矩和极限弯矩的计算公式并进行了验证，与试验结果和有限元模拟结果吻合较好。

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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 : 2026-01-07 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

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 : 2026-01-06 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

Seismic performance and prediction resilience of multi-cavity rectangular concrete-filled steel tube columns 多腔矩形钢管混凝土柱的抗震性能及预测回弹性

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

Journal of Constructional Steel Research

Pub Date : 2026-01-06 DOI: 10.1016/j.jcsr.2025.110227

Wen-zhuo Yu , Jing Liu , Wen-jun Wang , Guo-hui Cao , Yi-ming Yang , Zhi-cheng Pan

Rectangular concrete-filled steel tube (RCFST) columns have been widely applied in structural engineering because of their outstanding mechanical performance and construction efficiency. To address the limited confinement provided by single-cavity steel tubes in members with high width-to-thickness ratios, a multi-cavity RCFST (M-RCFST) configuration is proposed, in which stiffening steel plates partition the concrete core into multiple compartments. Quasi-static tests were conducted on eight M-RCFST specimens to examine the effects of cavity arrangement and axial compression ratio on key performance indices, including load-bearing capacity, stiffness, ductility, and energy dissipation, as well as failure mechanisms and load–displacement responses. The results indicate that an increase in cavity number significantly enhances load-bearing capacity, stiffness, energy dissipation, and ductility. By comparison, a higher axial compression ratio shows a limited effect on most properties but generally leads to reduced ductility. Based on the experimental results, a quasi-static finite element model of M-RCFST columns was established using ABAQUS and reproduced the observed failure modes, with acceptable agreement in hysteretic and skeleton curves. The average ratio of simulated to experimental peak load is 0.966, confirming the reliability of the numerical model. On this basis, a parametric study was carried out by varying cavity number, axial compression ratio, concrete strength, and steel strength. A restoring force model for M-RCFST columns was then developed from the finite element results and effectively represents the hysteretic response of the specimens. These results provide a quantitative basis for optimizing the seismic design of M-RCFST columns and support the development of engineering applications.

矩形钢管混凝土柱以其优异的力学性能和施工效率在结构工程中得到了广泛的应用。为了解决高宽厚比构件中单腔钢管的局限性，提出了一种多腔RCFST （M-RCFST）结构，其中加劲钢板将混凝土核心分隔成多个隔室。对8个M-RCFST试件进行了拟静力试验，研究了空腔布置和轴压比对承载力、刚度、延性和耗能等关键性能指标的影响，以及破坏机制和荷载-位移响应。结果表明，增加空腔数可显著提高结构的承载力、刚度、耗能和延性。相比之下，较高的轴压比对大多数性能的影响有限，但通常会导致延性降低。在试验结果的基础上，利用ABAQUS软件建立了M-RCFST柱的准静态有限元模型，重现了观测到的破坏模式，在滞回曲线和骨架曲线上具有较好的一致性。模拟峰值荷载与试验峰值荷载的平均比值为0.966，验证了数值模型的可靠性。在此基础上，通过改变空腔数、轴压比、混凝土强度和钢强度进行了参数化研究。基于有限元结果建立了M-RCFST柱的恢复力模型，该模型能有效地反映试件的滞回响应。这些结果为M-RCFST柱抗震设计优化提供了定量依据，并为工程应用的发展提供了支持。

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引用次数: 0

Intelligent evaluation framework for bonded-bolted hybrid joints between Fe-SMA and steel 铁- sma -钢复合粘结-螺栓连接智能评价框架

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

Journal of Constructional Steel Research

Pub Date : 2026-01-06 DOI: 10.1016/j.jcsr.2025.110231

Xuhong Qiang , Xinrui Li , Kaihao Wang , Xu Jiang , Xuanyi Lei , Fan Yang

This study investigates the mechanical performance of bonded-bolted hybrid joints (BHJs) between Fe-SMA and steel through finite element analysis and machine learning. The effects of geometric and material parameters, including end and edge distances, adhesive type, bolt diameter, plate thickness, bolt spacing, and lap length, were systematically examined. Meanwhile, the mechanical performance of BHJs was comprehensively compared with those of pure bonded and pure bolted joints. The parametric study reveals that the bolt edge distance is the most critical factor, as its increase leads to a significant improvement in both the ultimate load-bearing capacity and initial stiffness. The increment of bolt diameter and Fe-SMA plate thickness also substantially enhances the load-bearing capacity of the joints, while these parameters themselves serve as key controlling factors in preventing brittle failure modes. On this basis, an XGBoost model was developed to predict the ultimate load-bearing capacity of BHJs, incorporating five-fold cross-validation and the Optuna algorithm for optimization. The refined XGBoost model exhibits excellent predictive performance, with a coefficient of determination (R²) exceeding 0.98 and a mean absolute percentage error (MAPE) of 5.89 %.

本研究通过有限元分析和机器学习技术研究了Fe-SMA与钢之间的粘结-螺栓混合连接（BHJs）的力学性能。系统地检查了几何和材料参数的影响，包括端部和边缘距离、粘合剂类型、螺栓直径、板厚、螺栓间距和搭接长度。同时，将bhj与纯粘结和纯螺栓连接的力学性能进行了综合比较。参数化研究表明，锚杆边距是影响锚杆极限承载能力和初始刚度的最关键因素，边距的增大导致锚杆极限承载能力和初始刚度的显著提高。螺栓直径和Fe-SMA板厚度的增加也大大提高了节点的承载能力，而这些参数本身是防止脆性破坏模式的关键控制因素。在此基础上，建立了预测bhj极限承载能力的XGBoost模型，并结合五重交叉验证和Optuna算法进行优化。改进后的XGBoost模型具有良好的预测性能，其决定系数（R2）超过0.98，平均绝对百分比误差（MAPE）为5.89%。

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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 : 2026-01-05 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

Eccentric loading behavior of CFDEST short columns: Testing, modeling and design CFDEST短柱偏心加载性能：试验、建模与设计

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

Journal of Constructional Steel Research

Pub Date : 2026-01-05 DOI: 10.1016/j.jcsr.2025.110222

Jingwei Chen , Qihan Shen , Jingfeng Wang , Beibei Li , Yong Liu , Lei Guo

Elliptical steel tube (EST) has gained increasing adoption in structural engineering due to their favorable mechanical performance and architectural appeal. This study investigates the behavior of eccentrically-loaded concrete-filled double-skin elliptical steel tube (CFDEST) short columns through experimental and numerical analyses. The effects of key parameters, including load eccentricity, hollow ratio, diameter-to-thickness ratio, and aspect ratio, on failure modes, strength, and ductility are systematically examined. Furthermore, the distribution mechanisms of interfacial contact stress and longitudinal stress in concrete and EST are revealed. Based on experimental and analytical results, simplified design formulas are proposed to predict the eccentric compression strength of CFDEST columns, incorporating the influences of load eccentricity, hollow ratio, and cross-sectional characteristics. The results show that failure is characterized by semi-circumferential bulging of the outer EST, local inward buckling of the inner EST, and concrete crushing. The eccentric compressive strength decreases with increasing load eccentricity, hollow ratio, and diameter-to-thickness ratio. To optimize steel strength utilization, the strength of the inner EST should be designed lower than that of the outer EST. The findings provide a scientific basis for the design and implementation of CFDEST structures in practice.

椭圆钢管以其良好的力学性能和建筑美观性在结构工程中得到越来越多的应用。本文通过试验和数值分析研究了偏心加载双皮椭圆钢管混凝土短柱的受力性能。系统地研究了载荷偏心、空心比、径厚比和长径比等关键参数对破坏模式、强度和延性的影响。揭示了混凝土和EST界面接触应力和纵向应力的分布机理。根据试验和分析结果，提出了考虑荷载偏心、空心比和截面特性影响的CFDEST柱偏心抗压强度的简化设计公式。结果表明：破坏表现为外EST半圆周胀形，内EST局部向内屈曲，混凝土破碎；偏心抗压强度随载荷偏心率、空心比和径厚比的增大而减小。为优化钢的强度利用率，内层EST的强度设计应低于外层EST的强度设计，为CFDEST结构在实践中的设计与实施提供了科学依据。

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引用次数: 0

Numerical analysis and hysteresis modeling of concrete/ECC filled stiffened steel tubular column 混凝土/ECC填充钢管加劲柱的数值分析与迟滞模型

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

Journal of Constructional Steel Research

Pub Date : 2026-01-05 DOI: 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.

钢管混凝土柱具有良好的抗震性能。然而，这种组合柱的受力机理尚不清楚，其荷载-位移曲线的准确预测仍是一个未解决的问题。为了解决在理解和预测CFSST柱的地震行为方面的局限性，本研究开发并验证了一个改进的数值模型。加载过程根据特征点分为三个阶段，可以详细检查每个部件的力学行为以及钢管与混凝土或ECC之间的相互作用机制。基于力学平衡和平面截面假设，建立了载荷和变形分析模型，并由此建立了简化的三级骨架曲线来描述其非线性行为。然后定义了各个加载阶段的卸载刚度和迟滞规律，得到了一个全面的非线性迟滞模型。通过与试验和数值结果的对比分析，验证了模型的准确性和可靠性，为CFSST柱的设计和工程应用提供了有力的理论依据。研究结果表明，钢管的屈服显著降低了其对混凝土和ECC的约束，导致峰值后强度快速退化，而ECC通过纤维桥接效应显著延缓了这种退化。接触压力分析证实了混凝土在轴向荷载作用下具有更强的约束作用，在筒屈服后，加劲区具有最明显的约束作用。该模型有效地反映了钢管混凝土柱的滞回特性，为钢管混凝土柱的分析和工程应用提供了坚实的理论基础。

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引用次数: 0

Extreme static and blast performance of CFS roof trusses with symmetric profiles 对称廓形CFS屋架的极限静力和爆破性能

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

Journal of Constructional Steel Research

Pub Date : 2026-01-03 DOI: 10.1016/j.jcsr.2025.110218

Alaa Elsisi , Mohamed Elsawi Mahmoud , Ryan Salter , Michael Newberry , Hani Salim

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.

冷弯型钢（CFS）桁架是首选，因为他们的重量轻，高延展性和强度。它们既适用于民用建筑，也适用于军事建筑。当冲击波冲击建筑物时，前墙通常是最关键的区域。虽然较重的屋顶通常不会遇到重大问题，但较轻的系统（如CFS桁架）更容易受到屋顶爆炸压力的影响，因为它们较低的质量增加了脆弱性。由于CFS桁架的标准截面和连接方法的缺乏，对这些结构的设计和安全标准具有实际意义，特别是在爆炸荷载作用下。每个CFS制造商都设计独特的截面配置文件，其中包括对称和非对称配置。数值模拟为研究极端条件下的结构，特别是爆炸荷载下的结构提供了有价值的工具。然而，实验数据对于验证这些模型以确保准确性至关重要。拥有这样的数据集将提供验证和校准爆炸评估数值模型所需的关键输入，从而能够更可靠地预测局部（连接）和系统级响应。本研究的目的是进行高精度的实验测试，以支持未来数值模型的验证。该实验程序包括对称轮廓的CFS屋架的全尺寸静态和爆炸测试，以及螺钉连接和材料特性测试。静力和动力试验表明，连接破坏对梁式桁架的性能起着关键作用。

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引用次数: 0

Study on optimization method of axially compressed SLM manufacturing free corrugated square tubes 轴向压缩SLM制造自由波纹方管的优化方法研究

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

Journal of Constructional Steel Research

Pub Date : 2026-01-02 DOI: 10.1016/j.jcsr.2025.110213

Bing-Bing San , Xiang Cheng , Zhi-Wei Shan , Ye Qiu

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.

传统的薄壁构件形状优化多采用规则波纹和等截面优化方法，导致薄壁构件形状自由度有限。针对这一局限性，本文提出了一种基于非均匀有理b样条（NURBS）建模技术和多岛遗传算法（MIGA）的自由形状波纹构件优化方法。该方法以厚度方向控制点坐标为优化变量，以极限荷载下等效平均应力的最大化为优化目标，建立构件的优化模型。研究了控制点优化间隔、控制点布置方式和板材拼接方式对轴向力学性能的影响。采用选择性激光熔化（SLM）技术制备了最优的316l方形波纹短柱，并进行了轴压试验。试验结果表明，规则方筒短柱的破坏模式由中间凹陷向底部凹陷转变。优化后构件的极限承载力提高了53.22%，变形能力提高了69.12%。该研究验证了全局自由曲面形状优化方法的可行性，为复杂薄壁零件与增材制造技术的结合提供了新的思路。

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引用次数: 0