Thin-Walled Structures最新文献_第6页

Vibration reduction and wave reflection performance of radial-periodic annular acoustic black hole plate 径向周期环形声黑洞板的减振与波反射性能

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-05-01 Epub Date: 2026-02-14 DOI: 10.1016/j.tws.2026.114679

Yue Bao , Linxin Cai , Chenliang Zheng , Shaogan Ye , Xiaosong Xia , Liang Hou , Xiaoran Wang

Periodic two-dimensional acoustic black hole (ABH) plates have attracted considerable attention due to their lightweight and high-efficiency vibration control capabilities. However, most existing studies focus on translationally periodic structures, whereas the vibration analysis of circular ABH plates with radially periodic and enlarged tapered-thickness regions remains intractable because of the quasi-periodic characteristics and complex wave interactions. In this study, a radially periodic annular ABH plate model is proposed, and its dynamic performance is systematically compared with that of a conventional single ABH circular plate. To evaluate the dynamic behavior of the proposed configuration, a transfer matrix method based on the partitioned-element concept is developed and validated through finite element simulations. In addition, the energy dissipation of flexural wave is characterized using a wave-based approach. Analyses of wave reflection coefficients and vibration responses demonstrate that the radially periodic ABH circular plate exhibits pronounced advantages in damping coupling and broadband vibration attenuation, which can be attributed to a significant increase in localized ABH modes and the enhanced global-damping modes. The results show that both the mean velocity of the uniform portion and the vibration transmission loss are reduced by >20 dB compared with the conventional circular ABH plate over the frequency range of 10–6000 Hz. Dynamic experiments further confirm the accuracy of the theoretical predictions, as well as the effectiveness of the proposed structure in vibration attenuation and isolation. Moreover, comprehensive parametric analyses reveal that reducing the residual thickness and increasing the power-law exponent can significantly enhance the vibration attenuation performance of radially periodic ABH structures. This work provides new insights into broadband vibration absorption and isolation in circular plate structures.

周期二维声黑洞（ABH）板由于其轻量化和高效的振动控制能力而备受关注。然而，现有的研究大多集中在平移周期结构上，而具有径向周期和扩大锥形厚度区域的圆形ABH板由于其准周期特性和复杂的波相互作用而难以分析。本文提出了一种径向周期环形ABH板模型，并与传统单ABH圆板的动态性能进行了系统比较。为了评估该结构的动态特性，提出了一种基于分区单元概念的传递矩阵方法，并通过有限元仿真进行了验证。此外，还利用基于波的方法对弯曲波的能量耗散进行了表征。波反射系数和振动响应分析表明，径向周期ABH圆板在阻尼耦合和宽带减振方面具有明显的优势，这可以归因于局域ABH模态的显著增加和全局阻尼模态的增强。结果表明，在10 ~ 6000 Hz的频率范围内，与传统的圆形ABH板相比，均匀部的平均速度和振动传递损失都降低了20 dB；动力实验进一步证实了理论预测的准确性，以及所提出的结构在减振和隔振方面的有效性。综合参数分析表明，减小残余厚度和增加幂律指数可以显著提高径向周期ABH结构的减振性能。这项工作为圆板结构的宽带振动吸收和隔离提供了新的见解。

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引用次数: 0

Bond durability and deterioration mechanism of NiTi SMA-to-steel interface in simulated pipeline sediment 模拟管道沉积物中NiTi sma -钢界面耐久性及劣化机制

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-05-01 Epub Date: 2026-02-20 DOI: 10.1016/j.tws.2026.114683

Jun Deng , Min-Ting Zhong , Jun-Bo Liang , Zong-Chao Liu , Bo Guo , Hui-Qiang Li , Dong Guo

This study investigated the feasibility of using nickel-titanium shape memory alloy (NiTi SMA) to strengthen steel pipelines by evaluating the long-term bond performance under oil and gas pipeline sediment conditions. Four groups of single-lap shear NiTi SMA-to-steel joints were fabricated using optimized surface preparation protocols, with three replicates per group. The joints were then immersed in a synthetic pipeline sediment solution for periods of 30, 60, and 90 days to simulate actual operational conditions. Following immersion, lap-shear tests were conducted to assess the bond performance variations. Bond strength increased from 0 to days, likely due to continued curing of the adhesive, but decreased thereafter because of corrosion. Additionally, interfacial shear stress distributions and bond-slip behaviors were derived from the measured strain profiles along the NiTi SMA, accounting for its nonlinear stress-strain response. Furthermore, SEM, EDS, FTIR, and XPS analyses were performed to investigate the microscopic morphology and chemical structure variations of the bonding interface. These analyses revealed that bond deterioration was attributed to the hydrolytic cleavage, radical-induced crosslinking, and ingress of corrosive ions.

本研究通过评估油气管道沉积条件下镍钛形状记忆合金（NiTi SMA）的长期粘结性能，探讨了镍钛形状记忆合金（NiTi SMA）加固钢管道的可行性。采用优化后的表面处理方案制备了4组单搭接剪切NiTi sma -钢接头，每组3个重复。然后将接头浸入合成管道沉积物溶液中30、60和90天，以模拟实际操作条件。浸泡后，进行了剪切试验，以评估粘结性能的变化。粘结强度从0天增加到几天，可能是由于粘合剂的持续固化，但此后由于腐蚀而下降。此外，根据实测应变曲线推导了NiTi SMA的界面剪切应力分布和粘-滑行为，说明了其非线性应力-应变响应。利用SEM、EDS、FTIR和XPS等分析手段研究了键合界面的微观形貌和化学结构变化。这些分析表明，键的恶化是由于水解解理，自由基诱导交联和腐蚀离子的进入。

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引用次数: 0

Analytical solutions of functionally graded microbeam models based on the modified couple stress theory: A comparative study of Euler-Bernoulli, Timoshenko and Reddy beams 基于修正耦合应力理论的功能梯度微梁模型解析解：Euler-Bernoulli、Timoshenko和Reddy梁的比较研究

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-05-01 Epub Date: 2026-02-10 DOI: 10.1016/j.tws.2026.114648

Shenao Zhao , Lei Li , Pengpeng Shi

Mechanical analysis of micro-scale beam structures is critical for accurate displacement prediction. This study proposes an analytical framework based on the modified couple stress theory (MCST) to investigate the size-dependent static bending behavior of functionally graded (FG) Reddy microbeam. A material length scale parameter is introduced to capture size effects, while the material properties are assumed to vary continuously along the thickness direction. Within this framework, the Euler–Bernoulli, Timoshenko, and Reddy beam models are systematically integrated, thereby revealing their intrinsic relationships and degeneration paths at the micro-scale, along with the additional contributions of higher-order beam models. The results show that the linear contribution has a positive correlation with transverse displacement, while both quadratic and hyperbolic contributions exhibit negative correlations. Analytical solutions are derived for simply supported, cantilever, and clamped boundary conditions. A simply supported beam is used as an example to demonstrate that the proposed FG Reddy microbeam solution ultimately reduces to the classical Euler-Bernoulli beam solution. The accuracy of the present analytical solution is verified by comparing it with results reported in previous works. A detailed analysis is conducted to examine the effects of the gradient index, material length scale parameter, geometric configuration, and boundary conditions on the bending deformation and internal force distributions of microbeams. This study provides valuable insights into the mechanical behavior of different beam models at the micro-scale.

微尺度梁结构的力学分析是精确位移预测的关键。本文提出了一种基于修正耦合应力理论（MCST）的分析框架来研究功能梯度（FG） Reddy微梁的尺寸相关静态弯曲行为。引入材料长度尺度参数来捕捉尺寸效应，同时假设材料性能沿厚度方向连续变化。在这个框架内，系统地整合了Euler-Bernoulli、Timoshenko和Reddy光束模型，从而揭示了它们在微观尺度上的内在关系和退化路径，以及高阶光束模型的额外贡献。结果表明，线性贡献与横向位移呈正相关，而二次和双曲贡献均呈负相关。对简支、悬臂和夹紧边界条件导出了解析解。以简支梁为例，证明了FG - Reddy微梁解最终可归结为经典的欧拉-伯努利梁解。通过与前人研究结果的比较，验证了本文解析解的准确性。详细分析了梯度指数、材料长度尺度参数、几何形态和边界条件对微梁弯曲变形和内力分布的影响。该研究为不同梁模型在微观尺度上的力学行为提供了有价值的见解。

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引用次数: 0

Impact attenuation of a novel highway crash cushion using a kirigami corrugated honeycomb core 一种新型公路碰撞减震器的冲击衰减研究

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-05-01 Epub Date: 2026-02-21 DOI: 10.1016/j.tws.2026.114703

Wen Zhao , Zhejian Li , Hong Hao , Wensu Chen

Redirective crash cushions are widely used in highway safety protection systems as impact attenuation devices. This study presents a novel redirective crash cushion that utilizes the Kirigami corrugated honeycomb (KC) structure as its primary energy absorbing (EA) module. A full-scale KC EA module was tested using a rigid car impact system to observe its performance and validate the finite element model. Using the validated model, a detailed numerical model of a vehicle and the novel crash cushion were developed. Based on the Chinese standard JTG B05–01–2013, vehicle impacts under different scenarios onto the crash cushion were simulated under the TA level (80 km/h) impact conditions to evaluate compliance in terms of the impact attenuation and redirection performance. A comparative analysis was also conducted against the existing arc-type crash cushion, focusing on three key aspects: occupant injury risk, post-impact vehicle kinematics, and cushion performance. Five indicators, including the vehicle’s acceleration and deformation, the vehicle exit angle, energy absorption, and overall deformation of the crash cushion, were considered to evaluate the performance. Furthermore, under TS level (100 km/h) impact conditions, a graded configuration of the KC modules with the same mass was introduced to enhance energy absorption. The results showed compliance of the proposed KC crash cushion with all requirements under various impact scenarios and improved performance as compared to the existing arc-type crash cushion. In frontal impacts, it reduced vehicle acceleration and reduced vehicle front deformation by 20 %, decreasing the occupant injury risk by 13 %. In 15-degree oblique impacts, it reduced the vehicle exit angle by 13°, thereby lowering the risk of secondary collisions. Additionally, the graded configuration improved the energy absorption capacity by 19 % and effectively controlled peak vehicle acceleration, further enhancing protective performance and demonstrating strong tunability. Overall, the KC crash cushion provides a lightweight, economical, and reliable solution for highway safety protection, representing a significant advancement in vehicle collision mitigation technology.

定向碰撞缓冲垫作为冲击衰减装置广泛应用于公路安全防护系统中。本研究提出了一种新型的重定向碰撞缓冲垫，该缓冲垫利用Kirigami波纹蜂窝（KC）结构作为其主要的能量吸收（EA）模块。采用汽车刚性碰撞系统对全尺寸KC EA模块进行了测试，以观察其性能并验证有限元模型。利用验证的模型，建立了车辆的详细数值模型和新型碰撞缓冲装置。基于中国标准JTG B05-01-2013，模拟了不同场景下车辆对缓冲垫的冲击，在TA级别（80 km/h）的冲击条件下，评估了缓冲垫在冲击衰减和重定向性能方面的合规性。与现有的弧形缓冲垫进行了对比分析，重点关注乘员伤害风险、碰撞后车辆运动学和缓冲性能三个关键方面。考虑了车辆加速度和变形、车辆出口角度、能量吸收、碰撞缓冲整体变形等5个指标来评价碰撞缓冲性能。此外，在TS级（100 km/h）冲击条件下，采用相同质量的KC模块分级配置，以增强能量吸收。结果表明，与现有的弧形缓冲垫相比，所提出的KC缓冲垫符合各种冲击情景下的所有要求，并且性能有所提高。在正面碰撞中，它降低了车辆加速度，减少了20%的车辆前部变形，降低了13%的乘员伤害风险。在15度的倾斜碰撞中，它将车辆的出口角度减少了13°，从而降低了二次碰撞的风险。此外，梯度配置提高了19%的能量吸收能力，有效地控制了车辆峰值加速度，进一步提高了防护性能，并表现出较强的可调性。总的来说，KC碰撞缓冲垫为高速公路安全保护提供了一种轻便、经济、可靠的解决方案，代表了车辆碰撞缓解技术的重大进步。

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引用次数: 0

Semi-analytical solutions for lateral-torsional buckling of steel I-beams under localized fire 局部火灾作用下工字钢侧扭屈曲的半解析解

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-05-01 Epub Date: 2026-02-19 DOI: 10.1016/j.tws.2026.114693

Longkai Chen, Chao Zhang

In certain fire scenarios, such as localized fires, steel beams may experience thermal gradients in both longitudinal and transverse directions. These gradients degrade the steel’s mechanical properties and induce thermal expansion, generating complex internal forces in beams with restrained ends. Such thermal actions strongly influence the lateral-torsional buckling behavior of beams under transverse distributed load. Hitherto, research studies of the lateral-torsional buckling of steel beams under localized fires remain scarce. To address this gap, this study proposes a semi-analytical method for thermoelastic lateral-torsional buckling of steel beams subjected to distributed loads and bidirectional thermal gradients. Based on a beam-discrete strategy, the beam is divided into a series of segments, each assumed to have a constant longitudinal temperature. Considering variation of the effective centroid and effective shear center along the beam, each uniform beam segment is connected using noncoaxial nodes. A modular transfer matrix approach, founded on internal force relationships at each node, is then used to assemble the system. The resulting total transfer matrix yields the buckling load or critical temperature for any combination of longitudinal and transverse temperature gradients. In addition, a lumped-capacity method is developed to predict the temperature evolution of steel beams under localized fire conditions. Based on the obtained temperature distributions, the buckling time and critical temperature of the beams are further investigated. The accuracy and versatility of the proposed approach are validated through comparisons with results from existing literature and ANSYS simulations. Parametric studies are conducted to illustrate the effects of selected parameters on the beam’s buckling behavior.

在某些火灾情况下，例如局部火灾，钢梁在纵向和横向上都可能经历热梯度。这些梯度降低了钢的机械性能，并引起热膨胀，在两端受限的梁中产生复杂的内力。这种热作用强烈地影响梁在横向分布荷载作用下的侧向扭转屈曲行为。迄今为止，对局部火灾作用下钢梁侧扭屈曲的研究还很少。为了解决这一差距，本研究提出了一种半解析方法，用于钢梁在分布载荷和双向热梯度作用下的热弹性侧向扭转屈曲。基于梁离散策略，将梁分成一系列段，每个段假定具有恒定的纵向温度。考虑到有效质心和有效剪切中心沿梁方向的变化，各均匀梁段采用非同轴节点连接。然后使用基于每个节点的内力关系的模块化传递矩阵方法来组装系统。由此产生的总传递矩阵可得到任意纵向和横向温度梯度组合的屈曲载荷或临界温度。此外，提出了局部火灾条件下钢梁温度演化的集总容量预测方法。根据得到的温度分布，进一步研究了梁的屈曲时间和临界温度。通过与现有文献和ANSYS仿真结果的比较，验证了所提出方法的准确性和通用性。进行了参数化研究，以说明所选参数对梁屈曲行为的影响。

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引用次数: 0

Study on nonlinear flutter characteristics of flexible supported photovoltaic systems 柔性支撑光伏系统非线性颤振特性研究

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-05-01 Epub Date: 2026-02-20 DOI: 10.1016/j.tws.2026.114699

Chunguang Li , Minhao Zou , Kai Li , Peng Hu , Yan Han , Lian Shen

The flexible photovoltaic (PV) support system utilizesa cable-supported structure for load-bearing, characterized by its lightweight and flexible design. When PV modules are installed at steep angles due to geographical requirements, they exhibit classic bluff body aerodynamics, making them highly susceptible to flutter instability under wind loads. However, systematic studies on the influencing factors and underlying mechanisms of this flutter remain limited . This study is based on an actual large-span flexible PV support project and a comprehensive test investigation was performed using an elastically suspended sectional model in a wind tunnel. The study systematically examines the static wind-induced displacement versus additional tilt angle, the critical flutter wind speed, and the nonlinear flutter response of flexible-support photovoltaic structures, all evaluated over a range of installation angles from -18° to +18° Special emphasis is placed on the influence of vertical vibration participation on the nonlinear flutter characteristics in flexible PV structures with a low bending–torsion frequency ratio, along with an analysis of multistable vibration responses induced by various excitation conditions during testing. Results show that both the wind-induced static displacement and the additional tilt angle of the flexible PV structure increase significantly with wind speed and installation angle. . Typical bending-torsion coupled nonlinear flutter was observed across all tilt angles. Moreover, the level of vertical vibration participation was found to increase with the incoming wind speed but decrease with a greater tilt angle. In tests where vertical degrees of freedom were restricted, the increase in critical flutter wind speed was positively correlated with the degree of vertical vibration contribution compared to two-degree-of-freedom systems. Specifically, when vertical vibration participation is low, the flutter critical wind speed is largely unaffected. However, when participation is high, restricting vertical vibration significantly increases the structure's flutter critical wind speed. Furthermore, a subcritical Hopf bifurcation was observed in the experiments, attributed to the nonlinear characteristics of both structural and aerodynamic damping.

柔性光伏支撑系统采用索式支撑结构进行承重，具有轻量化和柔性设计的特点。由于地理位置的要求，当光伏组件安装在陡峭的角度时，它们表现出典型的钝体空气动力学，使它们在风荷载下极易受到颤振不稳定性的影响。然而，对这种颤振的影响因素和潜在机制的系统研究仍然有限。本研究基于实际的大跨度柔性光伏支架项目，采用弹性悬架截面模型在风洞中进行了综合试验研究。该研究系统地研究了静力风致位移随附加倾斜角的变化、临界颤振风速和柔性支撑光伏结构的非线性颤振响应，所有这些都在-18°到+18°的安装角度范围内进行了评估，特别强调了垂直振动参与对低弯扭频率比柔性光伏结构非线性颤振特性的影响。并对试验中不同激励条件下的多稳态振动响应进行了分析。结果表明：随着风速和安装角度的增加，柔性光伏结构的风致静位移和附加倾角均显著增大。在所有倾角下均观察到典型的弯曲-扭转耦合非线性颤振。垂直振动参与水平随风速的增大而增大，随倾角的增大而减小。在限制垂直自由度的试验中，与两自由度系统相比，临界颤振风速的增加与垂直振动贡献度呈正相关。当垂向振动参与度较低时，颤振临界风速基本不受影响。而当参与度较大时，限制垂直振动会显著增加结构的颤振临界风速。此外，由于结构和气动阻尼的非线性特性，在实验中观察到亚临界Hopf分岔。

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引用次数: 0

Topology optimization of SPF/DB-formed corrugated sandwich structure with process constraints 具有工艺约束的SPF/ db成型波纹夹层结构拓扑优化

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-05-01 Epub Date: 2026-02-19 DOI: 10.1016/j.tws.2026.114696

Ming Liu, Hanbin Wang, Wenjiong Chen, Shutian Liu

Superplastic forming/diffusion bonding (SPF/DB) is an advanced manufacturing technology to fabricate components with complex geometries. This process enables the production of intricate mechanical structures with enhanced performance, while significantly reducing part count and assembly complexity. However, the mechanical properties of SPF/DB sandwich structures are critically dependent on the topological configuration of their core layers. This highlights the need for a topology optimization methodology specifically adapted to the SPF/DB processes, taking into account relevant manufacturing constraints. In this study, an integrated topology optimization framework for SPF/DB sandwich structures is proposed, which employs the Beluga Whale Optimization (BWO) algorithm to achieve high-performance designs under realistic fabrication limitations. The proposed approach establishes a seamless workflow that integrates modelling, simulation, and optimization, thereby offering a systematic design strategy for SPF/DB structures that rigorously incorporates fabrication limitations. The effectiveness of the method is demonstrated through two illustrative case studies. This work provides valuable guidance for the initial layout design of diffusion bonding regions in lightweight sandwich structures under SPF/DB process constraints. Moreover, it contributes to the broader application of topology optimization techniques in SPF/DB manufacturing.

超塑性成形/扩散键合（SPF/DB）是一种制造复杂几何形状部件的先进制造技术。该工艺能够生产具有增强性能的复杂机械结构，同时显着减少零件数量和装配复杂性。然而，SPF/DB夹层结构的力学性能严重依赖于其核心层的拓扑结构。考虑到相关的制造限制，这突出了对专门适用于SPF/DB工艺的拓扑优化方法的需求。在本研究中，提出了一种SPF/DB夹层结构的集成拓扑优化框架，该框架采用白鲸优化（Beluga Whale optimization， BWO）算法，在现实制造限制下实现高性能设计。所提出的方法建立了一个集成建模、仿真和优化的无缝工作流程，从而为严格结合制造限制的SPF/DB结构提供了系统的设计策略。通过两个实例验证了该方法的有效性。该工作为SPF/DB工艺约束下轻质夹层结构扩散键合区的初始布局设计提供了有价值的指导。此外，它有助于拓扑优化技术在SPF/DB制造中的广泛应用。

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引用次数: 0

Axial compression behavior of square concrete-filled steel tube slender columns with concrete defects 含混凝土缺陷方钢管混凝土细长柱轴压特性研究

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-05-01 Epub Date: 2026-02-13 DOI: 10.1016/j.tws.2026.114667

Jiahang Xu, Ting Zhou, Zhihua Chen, Yutong Zhang

Defects formed during concrete casting can degrade the composite action of square concrete-filled steel tube (SCFST) columns, such as interfacial debonding and internal voids. The sensitivity of slender columns to concrete defects differs from that of short columns. This study reports axial compression tests on 34 slender SCFST columns (150 mm × 150 mm × 1500 mm) with five defect types and controlled defect ratios from 0% to 10.12%. The experimental program examines failure modes, load-displacement responses, ultimate capacity, initial stiffness and strain analysis. The disparity between separate distribution (SD) and uniform distribution (UD) defects at equivalent defect ratios is investigated. Results show local outward bulging of the steel tube with crushing of the infilled concrete as the dominant failure mode, while corner-located defects are more prone to induce brittle responses. Capacity reductions range from approximately 0% to 38.50% over the tested defect range. UD defects reduce the bearing capacity more than SD defects under the same defect ratio. The average bearing capacity of slender columns is 7.11% lower than that of short columns with the same defect type and defect ratio, which shows the amplification by second-order effects and the reduction of effective stiffness, especially when defects lie near the mid-height. A three-dimensional FE model is developed and validated against the tests, and a parametric study under pinned-pinned ends is conducted. Based on a validated FE database (63 samples), a unified defect reduction-factor model dependent on defect ratio, distribution pattern, defect type, and relative slenderness is established and incorporated into a defect-adjusted strength formulation. A conservative lower-envelope expression is further provided for design. When the effective length factor is taken as K=0.65 recommended by AISC 360-22, the predictions for 31 defective test specimens show good agreement with the measurements (mean prediction-to-test ratio≈0.997, standard deviation≈0.091).

混凝土浇筑过程中形成的缺陷会降低方钢管混凝土柱的复合作用，如界面剥离和内部空隙。细长柱对混凝土缺陷的敏感性不同于短柱。本文报道了34根细长SCFST柱（150 mm × 150 mm × 1500 mm）的轴压试验，缺陷类型为5种，缺陷率控制在0% ~ 10.12%。实验程序检查失效模式，载荷-位移响应，极限能力，初始刚度和应变分析。研究了在等效缺陷比下，均匀分布缺陷和分离分布缺陷之间的差异。结果表明：钢管局部向外胀形破坏以填充混凝土破碎为主要破坏模式，而角部缺陷更容易诱发脆性响应；在测试缺陷范围内，容量减少范围从大约0%到38.50%。在相同缺陷比下，UD缺陷对承载能力的降低大于SD缺陷。在缺陷类型和缺陷比相同的情况下，细长柱的平均承载力比短柱低7.11%，表现出二阶效应的放大和有效刚度的降低，特别是当缺陷位于中高附近时。建立了三维有限元模型，并进行了试验验证，并进行了钉-钉端下的参数化研究。基于已验证的有限元数据库（63个样本），建立了基于缺陷比率、分布模式、缺陷类型和相对长细度的统一缺陷缩减因子模型，并将其纳入缺陷调整强度公式。进一步为设计提供了保守的下包络表达式。当有效长度系数取AISC 360-22推荐的K=0.65时，31个缺陷试件的预测值与实测值吻合较好（平均预测与试验比≈0.997，标准差≈0.091）。

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引用次数: 0

Seismic performance of a tall RC chimney structure with an emphasis on vertical seismic behavior using shaking table test 采用振动台试验研究了钢筋混凝土烟囱结构的竖向抗震性能

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-05-01 Epub Date: 2026-02-14 DOI: 10.1016/j.tws.2026.114676

Yue Zhuo , Hao Wu , Ying Zhou , Xilin Lu

The effects of vertical seismic forces on high-rise structures like chimneys should not be underestimated. The simplified procedures for vertical seismic force in the Chinese chimney design code show notable discrepancies from observations and case analyses, particularly regarding the distribution and amplification trends of peak vertical seismic forces, which may lead to design inaccuracies. With the aim of studying the dynamic response characteristics of tall reinforced concrete chimneys under vertical seismic excitation, experimental research was conducted on a 1/30 scaled model of a typical 210 m tall single-flue reinforced concrete chimney by shaking table test. Such chimneys are thin-shell structures with no floors and have the characteristic of being slender and tall, with a simple and widely representative structural form. The results show that the chimney structure meets the seismic design target under earthquakes with an intensity of 7 (PGA 0.1 g) based on Chinese code and did not collapse under the earthquake input of intensity 9 (PGA 0.62 g). Two instances of damage were observed in the model during the tests: one caused primarily by horizontal ground motion, located near 4/5 of the structure's height, and the other due to the combined effect of both horizontal and vertical ground motion, located near 2/3 of the structure's height. The vertical seismic acceleration response increases significantly in the upper part of the model, with the maximum vertical acceleration amplification factor reaching over 10. Additionally, the contribution of vertical seismic stress increases with height. As the peak ground acceleration input increases, alternating tensile and compressive stresses are observed around the 2/3 height of the chimney, with this region gradually enlarging and propagating downward. This indicates a vulnerable zone in the chimney structure. Moreover, it is found that the vertical seismic force response of the chimney deviates significantly from the impulse method as provided in the Chinese “Code for design of chimneys” (GB50051-2013), which warrants further attention.

竖向地震力对烟囱等高层结构的影响不可低估。中国烟囱设计规范中简化的竖向地震力计算程序与观测和实例分析存在显著差异，特别是在竖向地震力峰值的分布和放大趋势方面，这可能导致设计不准确。为研究高层钢筋混凝土烟囱在竖向地震作用下的动力响应特性，采用振动台试验方法，对典型210 m高单烟道钢筋混凝土烟囱进行了1/30比例模型的试验研究。这种烟囱为无地板的薄壳结构，具有细长、高大的特点，结构形式简单，具有广泛的代表性。结果表明：烟囱结构在中国规范烈度为7 （PGA 0.1 g）的地震条件下满足抗震设计指标，在烈度为9 （PGA 0.62 g）的地震输入条件下不发生倒塌。在试验过程中，在模型中观察到两种破坏情况：一种主要是由水平地面运动引起的，位于结构高度的4/5附近，另一种是由于水平和垂直地面运动的综合影响，位于结构高度的2/3附近。模型上部竖向地震加速度响应显著增大，竖向加速度放大系数最大可达10以上。竖向地震应力的贡献随高度的增加而增大。随着峰值地面加速度输入的增加，在烟囱2/3高度附近出现拉压交变应力，该区域逐渐扩大并向下传播。这表明烟囱结构中有一个脆弱的区域。此外，烟囱竖向地震力反应与中国《烟囱设计规范》（GB50051-2013）规定的冲击法有明显偏差，值得进一步关注。

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引用次数: 0

Bionic design strategies and recent advances in lattice metamaterials: a comprehensive review 仿生设计策略和晶格超材料的最新进展：综述

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures

Pub Date : 2026-05-01 Epub Date: 2026-02-11 DOI: 10.1016/j.tws.2026.114654

Zhixuan Sun , Yu Gong , Hao Liu , Jianyu Zhang , Libin Zhao , Ning Hu , Chuanzeng Zhang

As a representative class of mechanical metamaterials, lattice structures have emerged as a frontier research focus due to their tailorable unit cell topologies and exceptional mechanical properties. In recent years, bio-inspired design approaches, informed by the multiscale structural features of biological systems, have provided innovative pathways for optimizing performance and enabling functional innovations in lattice structures. Leveraging the unique capabilities of additive manufacturing, bio-inspired lattice structures demonstrate significant potential in lightweight design, energy absorption, and mechanical property modulation. This review systematically summarizes recent advances in bio-inspired lattice structures and establishes a multidimensional classification framework based on bio-inspired design methodologies. First, design strategies are categorized into two hierarchical levels: unit cell-scale bio-inspired designs and macroscopic lattice architectures. Second, a taxonomy rooted in biological prototypes is proposed, encompassing plant-dominated, animal-dominated, and multi-source bio-inspired fusion designs, accompanied by systematic comparative analyses. Furthermore, advanced fabrication techniques for lattice structures are comprehensively discussed, and scientifically grounded perspectives on future development directions are presented. This work provides theoretical guidance and technical references for the design and high-performance development of novel bio-inspired lattice structures.

晶格结构作为一类具有代表性的机械超材料，由于其具有可定制的单元胞拓扑结构和优异的力学性能而成为前沿研究热点。近年来，受生物系统多尺度结构特征影响的仿生设计方法为优化晶格结构的性能和实现功能创新提供了创新途径。利用增材制造的独特能力，仿生晶格结构在轻量化设计、能量吸收和机械性能调制方面显示出巨大的潜力。本文系统总结了仿生晶格结构的最新研究进展，并建立了基于仿生设计方法的多维分类框架。首先，设计策略分为两个层次：单位细胞尺度的生物启发设计和宏观晶格结构。其次，提出了基于生物原型的分类，包括植物为主、动物为主和多源生物启发的融合设计，并进行了系统的比较分析。此外，对晶格结构的先进制造技术进行了全面的讨论，并对未来的发展方向提出了科学的展望。本研究为新型仿生晶格结构的设计和高性能开发提供了理论指导和技术参考。

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引用次数: 0