Thin-Walled Structures最新文献_第2页

Experimental performance of CFST K-joints under combined sustained load and chloride corrosion CFST k形接头在持续荷载和氯化物腐蚀联合作用下的试验性能

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-01-11 DOI: 10.1016/j.tws.2026.114515

Guiming Liang , Chao Hou , Zhan-Shuo Liang , Lin-Hai Han

This study experimentally investigates the mechanical degradation of concrete-filled steel tubular (CFST) K-joints under the combined effects of sustained load and chloride corrosion, a critical scenario in offshore and marine applications for which research remains limited. A series of 13 tubular K-joints, including 11 specimens with CFST chords and 2 with circular hollow section (CHS) chords, are first subjected to combined sustained load and accelerated corrosion tests, and are then tested to determine their ultimate capacity under typical static boundary conditions. The effects of geometric parameters, corrosion damage degrees, and sustained load ratios on the performance of CFST K-joints are analyzed. The study reveals, within the tested parameter ranges, that sustained loading contributes to non-negligible performance degradation by promoting creep in the concrete core and therefore inducing steel-concrete stress redistribution, which then results in variation in the joint stiffness. The influence of sustained loading becomes more pronounced when the chord wall thickness decreases. Moreover, corrosion is identified as the primary factor in performance degradation, because it reduces brace wall thickness and effective cross-sectional area and ultimately causes a 36.2% decrease in ultimate capacity as well as a 48.4% loss in initial stiffness. Based on these findings, a formula for calculating the residual bearing capacity of CFST K-joints is proposed, which can provide theoretical support for the service life assessment and safety design of CFST K-joints in harsh marine environments.

本研究通过实验研究了钢管混凝土（CFST） k形节点在持续荷载和氯化物腐蚀的共同作用下的力学退化，这是海上和海洋应用的一个关键场景，但研究仍然有限。选取了13个管形节点，其中11个为CFST弦节点，2个为圆空心弦节点，进行了持续荷载和加速腐蚀联合试验，并在典型静态边界条件下进行了极限承载力试验。分析了几何参数、腐蚀损伤程度和持续载荷比对钢管混凝土k形节点性能的影响。研究表明，在测试参数范围内，持续加载通过促进混凝土核心的徐变，从而引起钢-混凝土应力重新分布，从而导致节点刚度的变化，从而导致不可忽略的性能退化。随着弦壁厚度的减小，持续荷载的影响更为明显。此外，腐蚀被认为是性能下降的主要因素，因为腐蚀降低了支撑壁厚和有效横截面积，最终导致极限承载力下降36.2%，初始刚度损失48.4%。在此基础上，提出了钢管混凝土k形节点剩余承载力计算公式，可为钢管混凝土k形节点在恶劣海洋环境下的使用寿命评估和安全设计提供理论支持。

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引用次数: 0

Temperature-dependent mechanical properties and crashworthiness of foam-filled spiral tube 泡沫填充螺旋管的温度相关力学性能和耐撞性

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-01-10 DOI: 10.1016/j.tws.2026.114510

Geng Luo , Zhaofei Zhu , Jieqiong Zhang , Yike Wang , Pu Xue , Yisong Chen

Thin-walled structures are widely employed in engineering protection at diverse environmental temperatures because of their superior energy-absorption capacity. This study developed a foam-filled spiral tube (FFST) to further improve the crashworthiness of thin-walled structures and systematically investigated its temperature-dependent mechanical behavior and energy-absorption characteristics. A combined experimental-numerical approach was adopted: finite-element models based on Voronoi diagrams were validated through quasi-static tests in a temperature chamber (−20 to 45 °C), followed by a parametric analysis. The results indicated that low temperatures increased the brittleness of the foam, leading to cell-wall fracture and lateral shear deformation. As the temperature increased, the deformation mode transitioned to plastic-hinge-dominated buckling, followed by stable layer-by-layer compaction. When the temperature increased from −20 to 45 °C, the specific energy absorption (SEA) decreased by 76.7 %, while the ultimate load-carrying capacity (ULC) decreased by 45.8 %. These findings demonstrate that although elevated temperatures reduce the energy-absorption capacity of the foam, they improve the smoothness of the deformation process and enhance the stability of the energy-absorption performance. For spiral tubes (STs), small amplitudes and long wavelengths induce asymmetric, unstable deformation, whereas increasing the amplitude or reducing the wavelength improves the geometric stability. Elevated temperatures reduce structural strength and SEA, and STs with small corrugation parameters exhibit temperature-sensitive load capacities owing to their potential for thermal instability. Foam filling enhances the SEA but may exacerbate the deformation instability of small-parameter STs at high temperatures. Geometric optimization can offset foam performance degradation and improve crashworthiness. The interaction analysis revealed that at low temperatures, foam protrusions enhanced interlocking, whereas at high temperatures, sliding friction dominated and diminished the energy contribution. Larger amplitudes stabilize axisymmetric crushing but limit foam penetration, whereas longer wavelengths increase the contact area but may aggravate global instability under volumetric expansion. These findings clarify the temperature-dependent deformation mechanisms and foam-tube interactions of the FFST and offer theoretical guidance for the design of temperature-adaptive energy-absorbing structures.

薄壁结构以其优越的吸能能力广泛应用于不同环境温度下的工程防护中。为了进一步提高薄壁结构的耐撞性，本研究开发了一种泡沫填充螺旋管（FFST），并系统地研究了其随温度变化的力学行为和吸能特性。采用实验-数值相结合的方法：基于Voronoi图的有限元模型在温度室（- 20 ~ 45°C）中进行准静态试验验证，然后进行参数分析。结果表明：低温增加了泡沫的脆性，导致泡沫胞壁破裂和侧向剪切变形；随着温度的升高，变形模式转变为以塑性铰为主的屈曲，随后是稳定的逐层压实。当温度从- 20℃升高到45℃时，比能吸收（SEA）下降了76.7%，极限承载能力（ULC）下降了45.8%。结果表明，高温虽然降低了泡沫材料的吸能能力，但提高了泡沫材料变形过程的平整度，增强了泡沫材料吸能性能的稳定性。对于螺旋管（STs），小振幅和长波长会导致不对称、不稳定的变形，而增加振幅或减小波长会改善几何稳定性。高温会降低结构强度和SEA，而波纹参数较小的STs由于其潜在的热不稳定性而表现出对温度敏感的负载能力。泡沫填充增强了SEA，但可能加剧小参数STs在高温下的变形不稳定性。几何优化可以抵消泡沫性能下降，提高耐撞性。相互作用分析表明，在低温下，泡沫突出增强了联锁，而在高温下，滑动摩擦占主导地位，降低了能量贡献。较大的振幅稳定了轴对称破碎，但限制了泡沫渗透，而较长的波长增加了接触面积，但可能加剧体积膨胀下的整体不稳定性。这些发现阐明了FFST的温度依赖变形机制和泡沫管相互作用，为温度自适应吸能结构的设计提供了理论指导。

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引用次数: 0

Low-velocity impact response and energy absorption of T800 CFRP/Stainless-steel ultra-thin strip composite tubes T800 CFRP/不锈钢超薄带复合管的低速冲击响应及能量吸收

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-01-10 DOI: 10.1016/j.tws.2026.114509

Zhuhaoyan Wang , Longhui He , Xiaoqiong Zhang , tingting zhang , Tao Wang , Qingxue Huang

To overcome the limitation of conventional fiber metal composite tubes (FMCTs) in achieving further lightweight design without compromising impact resistance and energy absorption, this study proposes a novel thin-walled multilayer structure—carbon fiber/stainless-steel ultra-thin strips fiber metal composite tube (CSFMCT). CSFMCT specimens (80 mm and 120 mm) were fabricated via roll-forming and hot-press curing, and subjected to axial and transverse low-velocity impact tests. The dynamic response, failure mechanisms, and energy dissipation behaviors were systematically analyzed with high-speed imaging, SEM, and XCT. Comparative tests with CFRP and Al tubes were also conducted to assess performance differences. Results show that with axial impact (100–400 J), the CSFMCT peak load rose by 41% and displacement by 72%. Under transverse impact (40–80 J), the peak load increased by 36% and the displacement by 31%. The CSFMCT dissipates energy through the sequential coordination of fiber brittle fracture with the shear failure and plastic deformation of the steel strips, accompanied by delamination between the fiber and steel strip layers, thereby achieving a stepwise and progressive energy dissipation process. Compared with CFRP and Al tubes, CSFMCT exhibits superior performance: its impact load is 21% higher than CFRP in the axial direction and 10% higher transversely. In terms of energy absorption, the axial EA of CSFMCT is on average 17.3 J higher than that of Al, with SEA 9% higher; under transverse loading, the EA is 8% higher and SEA 30% higher. These results demonstrate the strong potential of CSFMCT as a lightweight, high-performance energy-absorbing structure.

为了克服传统纤维金属复合管（fmct）在实现进一步轻量化设计而不影响抗冲击性和能量吸收方面的局限性，本研究提出了一种新型薄壁多层结构-碳纤维/不锈钢超薄带纤维金属复合管（CSFMCT）。采用滚压成形和热压固化两种方法制备了80mm和120mm的CSFMCT试件，并进行了轴向和横向低速冲击试验。采用高速成像、扫描电镜（SEM）和XCT等技术对其动力响应、破坏机制和耗能行为进行了系统分析。还进行了CFRP和Al管的比较试验，以评估性能差异。结果表明：轴向冲击（100 ~ 400 J）时，CSFMCT峰值荷载增加41%，位移增加72%；横向冲击（40 ~ 80 J）时，峰值载荷增加36%，位移增加31%。CSFMCT通过纤维脆性断裂与钢带剪切破坏和塑性变形的顺序协调，同时伴随着纤维层与钢带层之间的分层，从而实现一个逐步递进的能量耗散过程。与CFRP和Al管相比，CSFMCT表现出更优越的性能，其轴向冲击载荷比CFRP高21%，横向冲击载荷比CFRP高10%。在能量吸收方面，CSFMCT的轴向EA比Al平均高17.3 J， SEA高9%；横向荷载作用下，EA提高8%，SEA提高30%。这些结果显示了CSFMCT作为一种轻质、高性能吸能结构的强大潜力。

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引用次数: 0

Tuning asymmetric domes in thin-walled composite pressure vessels for enhanced burst strength 调整薄壁复合材料压力容器中的非对称圆顶以提高破裂强度

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-01-10 DOI: 10.1016/j.tws.2026.114514

Honghao Liu , Lei Zu , Qian Zhang , Guiming Zhang , Jianhui Fu , Helin Pan , Qiaoguo Wu , Xiaolong Jia , Guojun Lu , Lichuan Zhou

Thin-walled composite pressure vessels are widely used in energy storage owing to outstanding mechanical performance. However, asymmetric domes with large polar openings cause stress concentration and defect accumulation, leading to premature failure under low internal pressure. In this study, an asymmetric-dome tuning strategy is proposed for composite pressure vessels to suppress crack initiation and optimize load-transfer paths, and an asymmetric coefficient is introduced to quantify how geometric asymmetry affects stress redistribution and structural performance. The results indicate that increasing the boss ratio of back domes decreases the asymmetric coefficient and reduces end stresses, thereby delaying crack initiation and enhancing burst strength. In contrast, increasing the ellipsoid ratio of front domes elevates the coefficient and smooths meridional load-transfer paths, transforming failure from abrupt local tearing to progressive global rupture. A moderate increase in the front-dome polar opening ratio promotes stiffness balance and keeps the asymmetric coefficient within a favorable range, while coordinated tuning of the two domes under a fixed back-dome polar opening ratio produces the most favorable burst-strength outcome. These findings not only clarify the governing influence of geometric asymmetry on failure-mode transition but also provide practical guidance for designing lightweight and reliable composite pressure vessels.

薄壁复合压力容器由于其优异的力学性能，在储能领域得到了广泛的应用。然而，具有大极性开口的非对称圆顶会导致应力集中和缺陷积累，导致在低内压下过早失效。本文提出了复合材料压力容器的非对称圆顶调谐策略，以抑制裂纹萌生和优化载荷传递路径，并引入非对称系数来量化几何不对称对应力重分布和结构性能的影响。结果表明：增大后穹顶凸度比可减小后穹顶的不对称系数，降低端应力，从而延缓裂纹萌生，提高破裂强度；相比之下，增加前圆顶的椭球比可以提高系数并平滑子午荷载传递路径，将破坏从突然的局部撕裂转变为渐进的整体破裂。适度增加前穹顶极开比可促进刚度平衡，使不对称系数保持在一个较好的范围内，而在固定后穹顶极开比下，两个穹顶协调调整可获得最有利的爆破强度结果。这些发现不仅阐明了几何不对称对失效模式转变的支配作用，而且为设计轻量化、可靠的复合材料压力容器提供了实践指导。

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引用次数: 0

Modeling and analysis of the high-velocity impact resistance of composite butterfly-shaped honeycomb sandwich panels with shear-stiffening material 剪切加筋材料蝴蝶形蜂窝夹芯板高速抗冲击性能建模与分析

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-01-10 DOI: 10.1016/j.tws.2026.114518

Guowei Sun , Xiaobing Yu , Zelin Li , Hongbo Cui , Hui Li , Xiangping Wang , Jian Xiong , Jin Zhou , Zhongwei Guan

The high-velocity impact resistance of composite butterfly-shaped honeycomb sandwich panels (CBSHSPs) with flocculated fiber-reinforced shear-stiffening material (SSM) is investigated. Originally, two finite element models of the SSM-CBSHSP structure are developed using the full modeling method (FMM) and the equivalent modeling method (EMM) based on ABAQUS software to predict the high-velocity impact behaviors, respectively. In the FMM, the damage and failure of the butterfly-shaped honeycomb core and SSM are considered by the Besant failure criterion and the Christensen failure criterion, respectively, in which the strain rate effect is taken into account. In contrast, in the EMM, the Hamiltonian equivalence theory is employed to determine the equivalent Young's modulus and Poisson's ratio of the equivalent core, and the modified Christensen failure criterion is proposed to assess its failure penetration by a high-velocity impact projectile. Furthermore, specimens of SSM-CBSHSP with unfilled SSM, filled SSM, and filled flocculated fiber-reinforced SSM are prepared. Experimental investigations with varying initial impact velocities are also performed on these specimens to validate the developed models and assess the impact resistance. Finally, the influences of critical parameters on the impact resistance of the studied structure are analyzed and discussed, yielding several practical conclusions for the manufacturing and optimization of such sandwich panels.

研究了絮凝纤维增强剪切加筋材料（SSM）复合蝴蝶形蜂窝夹层板（CBSHSPs）的高速抗冲击性能。基于ABAQUS软件，建立了SSM-CBSHSP结构的两种有限元模型，分别采用完全建模法（FMM）和等效建模法（EMM）预测高速冲击行为。在FMM模型中，考虑了应变率效应的Besant破坏准则和Christensen破坏准则分别考虑了蝴蝶形蜂窝芯和SSM的破坏和破坏。EMM采用哈密顿等效理论确定等效芯的等效杨氏模量和泊松比，并提出改进的Christensen失效准则来评估其在高速弹丸冲击下的失效侵彻。制备了未填充、填充和填充絮凝纤维增强SSM的SSM- cbshsp试样。在不同的初始冲击速度下，还对这些试样进行了实验研究，以验证所开发的模型并评估其抗冲击性。最后，对关键参数对所研究结构抗冲击性能的影响进行了分析和讨论，为这种夹层板的制造和优化提供了一些实用的结论。

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引用次数: 0

An experimental and numerical method to investigate the effect of repeated impact energy distribution on laminated composites 采用实验和数值方法研究了反复冲击能量分布对层合复合材料的影响

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-01-10 DOI: 10.1016/j.tws.2026.114513

Jinbo Du , Huanhuan Zhao , Peng Hao , Jialin Cui , Han Wang

Composite structures in service are susceptible to repeated low-velocity impacts, where the distribution of impact energy critically influences damage evolution. This study systematically investigates how different Impact Energy Distribution (IED) modes-under a constant total energy of 30 J-govern the failure response of carbon/epoxy laminates. Three IED scenarios were examined: 10 J × 3, 15 J × 2, and 30 J × 1. Experimental results reveal that for the same total energy, an increased number of impacts elevates peak force and maximum displacement but reduces total absorbed energy. A high-fidelity finite element model, incorporating the Puck failure criterion, was developed and validated, demonstrating excellent agreement with experiments. Crucially, the study unveils three fundamental ways in which IED mode dictates damage behavior: first, it activates certain failure mechanisms only at higher single-impact energy levels; second, it controls the propagation extent of specific damage types, such as fiber and matrix cracking, as well as delamination area; third, it alters the very morphology of damage, as evidenced by the transition of impact-surface fiber compression failure from an elongated linear band in IED₁₀/IED₁₅ to a peanut-shaped distribution in IED₃₀. These findings provide novel, mechanistic insights into cumulative damage, essential for designing composite structures against repeated impacts.

复合材料结构在服役过程中容易受到多次低速冲击，其中冲击能量的分布对损伤演化具有重要影响。本文系统地研究了在总能量为30j的恒定条件下，不同的冲击能量分布模式对碳/环氧复合材料破坏响应的影响。研究了三种简易爆炸装置场景：10 J × 3、15 J × 2和30 J × 1。实验结果表明，在总能量相同的情况下，冲击次数的增加会提高峰值力和最大位移，但会降低总吸收能量。建立了包含Puck破坏准则的高保真有限元模型，并进行了验证，与实验结果吻合良好。至关重要的是，该研究揭示了IED模式决定损伤行为的三种基本方式：首先，它仅在较高的单次撞击能量水平下激活某些破坏机制；二是控制纤维、基体开裂等特定损伤类型的扩展程度和分层面积；第三，它改变了损伤的形态，从IED10/IED15中冲击表面纤维压缩破坏的细长线性带到IED30中花生状分布的转变就可以证明这一点。这些发现为累积损伤提供了新颖的、机械的见解，对于设计复合材料结构以抵抗重复冲击至关重要。

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引用次数: 0

Seismic performance of an unequal-depth steel beam-to-CFST column joint with insert diaphragm: Experiment, numerical analysis and design method 带插入隔板的不等深钢梁-钢管混凝土柱节点的抗震性能：试验、数值分析和设计方法

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-01-09 DOI: 10.1016/j.tws.2026.114508

Jialiang Jin , Wei Wang , Weifeng Jiao , Min Sun , Huijie Xu , Chenyue Tian

For unequal-depth steel beam-to-CFST (UDSB-to-CFST) column joints commonly encountered in practical engineering, this study proposes an assembled joint configuration incorporating insert diaphragms. The insert diaphragms are welded to the slotted boundary column during factory prefabrication, after which the joint can be assembled on-site using bolted connections to the steel beam, eliminating field welding and ensuring improved constructability. A large-scale quasi-static cyclic test was conducted to evaluate the seismic performance of the proposed joint. The test results demonstrated that the joint exhibited favorable ductility, excellent plastic deformation capacity, and satisfactory energy dissipation. A refined finite element (FE) model was developed and validated against the test results. Parametric analyses were then carried out to investigate the effects of beam depth ratio, beam width ratio, column width-to-thickness ratio, diaphragm geometry, and axial load ratio. The results revealed that the beam depth ratio and column dimensions predominantly govern panel-zone shear strength and deformation capacity. Based on the observed mechanisms, mechanics-based formulas for the panel-zone shear strength were derived by combining the contributions of the column web and confined concrete and verified against FE results. Simplified expressions for the yield and ultimate strengths of the beam end insert diaphragm were also developed, considering potential weld failure. Comparisons with experimental and numerical results verify the good prediction accuracy of the proposed formulas, offering practical guidance for the seismic design of prefabricated UDSB-to-CFST joints.

对于实际工程中经常遇到的不等深钢梁- cfst （udsdb - cfst）柱节点，本研究提出了包含插入隔板的组合节点配置。插入式隔膜在工厂预制时焊接到开槽边界柱上，然后通过螺栓连接到钢梁上进行现场组装，消除了现场焊接，提高了施工性。通过大型拟静力循环试验对节理的抗震性能进行了评价。试验结果表明，该节点具有良好的延性、良好的塑性变形能力和良好的消能性能。建立了精细化有限元模型，并对试验结果进行了验证。然后进行了参数分析，研究了梁深比、梁宽比、柱宽厚比、隔膜几何形状和轴向载荷比的影响。结果表明，梁深比和柱尺寸对板区抗剪强度和变形能力影响较大。在此基础上，结合柱腹板和约束混凝土的作用，导出了基于力学的板区抗剪强度计算公式，并与有限元结果进行了验证。考虑潜在的焊接破坏，建立了梁端插入膜片屈服强度和极限强度的简化表达式。通过与试验和数值结果的比较，验证了所提公式具有较好的预测精度，为装配式udb - cfst节点抗震设计提供了实践指导。

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引用次数: 0

An efficient semi-analytical approach for postbuckling analysis of laminated composite plates with straight edges 直边复合材料层合板后屈曲分析的一种有效半解析方法

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-01-09 DOI: 10.1016/j.tws.2025.114394

Mohamed H. Elalfy, Roeland De Breuker, Saullo G.P. Castro

Postbuckling in thin-walled aircraft structures can lead to a redistribution of loads while the structure continues to carry load. This behaviour is particularly important in stiffened panels, where local buckling does not necessarily imply failure. Accurately modelling this behaviour is essential, but the analysis is often computationally expensive. A computationally efficient methodology is developed to predict postbuckling behaviour, supporting preliminary design and multidisciplinary optimization of aerospace structures. The formulation is based on the Rayleigh–Ritz method using hierarchical polynomials as shape functions. These polynomials enable closed-form integration of the energy functional and allow the application of various boundary conditions. Two solution schemes are implemented: a perturbation-based expansion and an iterative correction method based on the Normal Flow Algorithm. The solutions are verified against results from the literature and finite element simulations. Results show that the methodology accurately predicts postbuckling behaviour while substantially reducing computational cost. The efficiency and flexibility in modelling different boundary conditions make the approach well-suited for integration into structural design and optimization frameworks that require repeated postbuckling evaluations.

薄壁飞机结构的后屈曲会在结构继续承载载荷的同时导致载荷的重新分配。这种行为在加筋板中尤为重要，在加筋板中，局部屈曲不一定意味着失效。准确地模拟这种行为是必要的，但分析通常是计算昂贵的。开发了一种计算效率高的方法来预测后屈曲行为，支持航空航天结构的初步设计和多学科优化。该公式基于瑞利-里兹方法，使用层次多项式作为形状函数。这些多项式使能量泛函的封闭积分成为可能，并允许应用各种边界条件。实现了两种求解方案：基于微扰展开法和基于法向流算法的迭代修正法。并与文献和有限元模拟结果进行了对比验证。结果表明，该方法可以准确预测后屈曲行为，同时大大降低了计算成本。不同边界条件建模的效率和灵活性使得该方法非常适合集成到需要重复屈曲后评估的结构设计和优化框架中。

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引用次数: 0

A hybrid beam–shell iFEM model for structural monitoring of thin-walled structures subjected to thermo-elastic loading 热弹性荷载作用下薄壁结构监测的梁-壳混合有限元模型

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-01-09 DOI: 10.1016/j.tws.2026.114502

Ming-Jyun Dai, Chu-Mou Hsiao

The primary advantage of the inverse finite element method (iFEM) lies in its ability to reconstruct structural responses from measured strain data without relying on traction boundary conditions. In this study, an iFEM-based approach is proposed for structural monitoring of thin-walled structures under thermo-elastic loading. This topic has received limited attention in the iFEM literature. Moreover, the beam–shell coupling technique is employed to reduce the number of discrete elements required for modeling stiffeners, thereby improving computational efficiency. A series of benchmark problems and advanced numerical examples involving thin-walled structures under thermo-elastic loading is investigated using the full–shell and beam–shell iFEM models. According to the comparisons, the beam–shell model is capable of reliably reconstructing structural deformations and stresses, with maximum displacement and stress errors over all numerical examples being 6.37% and 10.65%, respectively, while requiring less computational time than the full–shell model. It is demonstrated that the proposed iFEM models can achieve reliable structural monitoring under thermo-elastic loading.

逆有限元法（iFEM）的主要优点在于它能够从实测应变数据中重建结构响应，而不依赖于牵引边界条件。本文提出了一种基于有限元法的薄壁结构热弹性载荷监测方法。这一专题在妇发基金文献中得到的注意有限。此外，采用梁-壳耦合技术减少了加劲肋建模所需的离散单元数量，从而提高了计算效率。采用全壳和梁-壳有限元模型研究了薄壁结构在热弹性载荷作用下的一系列基准问题和高级数值算例。结果表明，梁-壳模型能够可靠地重建结构变形和应力，所有数值算例的最大位移和应力误差分别为6.37%和10.65%，且计算时间比全壳模型少。结果表明，所提出的有限元模型能够实现热弹性载荷下结构的可靠监测。

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引用次数: 0

Experimental investigation of 6061-T6 aluminium alloy CHS stub columns under transient fire conditions considering intumescent coatings 考虑膨胀涂层的6061-T6铝合金CHS短柱瞬态火灾试验研究

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-01-08 DOI: 10.1016/j.tws.2026.114507

Zhongxing Wang , Yifan Wang , Lele Zhan , Shijia He , Boshan Chen

This study investigated the local buckling behaviour of aluminium alloy circular hollow section (CHS) stub columns under transient fire conditions, with a particular focus on the effects of intumescent coating. A total of 18 experimental tests were conducted, including four tests at room temperature, eight under high-temperature transient conditions without fire protection, and six under similar conditions with intumescent coating. Prior to the stub column tests, the material properties of the 6061-T6 aluminium alloy at room temperature were obtained through the tensile coupon tests, and the initial geometric imperfections of the stub columns were measured using a 3D laser scanner. The load-end shortening behaviour, failure modes, critical temperatures, and the effectiveness of intumescent coatings were investigated in this study. The test results revealed a distinct contrast in failure modes: under ambient conditions, all stub column specimens exhibited elephant-foot-type local buckling at the ends, whereas under unprotected, high-temperature transient conditions, local buckling occurred at mid-height. Based on the experimental results, the applicability and accuracy of Chinese Code (T/CECS 756–2020) and European Standard (EN 1999–1–1) (2007) were evaluated, and the results revealed that existing design provisions underestimate the load-bearing capacity of such aluminium alloy stub columns at elevated temperatures. To address this, a preliminary empirical formula based on modified European Standard (EN1993–1–2) (2005) was developed for accurately determining the critical temperature of aluminium alloy stub columns under fire conditions.

本文研究了铝合金圆空心截面（CHS）短柱在瞬态火灾条件下的局部屈曲行为，特别关注了膨胀涂层的影响。共进行了18次试验试验，其中常温试验4次，无防火高温瞬态试验8次，有膨胀涂层的相似工况试验6次。在短柱试验之前，通过拉伸试验获得了6061-T6铝合金在室温下的材料性能，并利用三维激光扫描仪测量了短柱的初始几何缺陷。本研究对膨胀涂层的载荷端缩短行为、失效模式、临界温度和有效性进行了研究。试验结果揭示了破坏模式的鲜明对比：在环境条件下，所有短柱试件在末端表现出象脚型局部屈曲，而在无保护的高温瞬态条件下，局部屈曲发生在中高度。基于试验结果，对中国规范（T/CECS 756-2020）和欧洲标准（EN 1999-1-1）（2007）的适用性和准确性进行了评价，结果表明，现有设计规定低估了此类铝合金短柱在高温下的承载能力。为了解决这个问题，根据修改后的欧洲标准（EN1993-1-2）（2005），开发了一个初步的经验公式，用于准确确定铝合金短柱在火灾条件下的临界温度。

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