Engineering Structures最新文献_第5页

Integrated design of thermally actuated metastructure for modulatable dual vibration isolation function 具有可调双隔振功能的热驱动元结构集成设计

IF 6.4 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2026-02-07 DOI: 10.1016/j.engstruct.2026.122271

Yue Hu , Jianlei Zhao , Hao Zhou , Ivana Kovacic , Runan Hua , Honggang Li , Rui Zhu

Integrated metastructures capable of low-frequency vibration isolation while sustaining static load-bearing capacity have demonstrated outstanding performance in practical engineering applications. However, modulating their vibration isolation function for varying load-bearing conditions remains a challenge. To address this challenge, we propose a novel approach in which the metastructure encompasses thermally actuated unit cells. A theoretical model is first developed for metastructure’s unit cell with a bi-material double-layer curved beam, which enables the tuning of the effective stiffness characteristics via thermal actuation. The static characteristics of the unit cell are analyzed theoretically and validated numerically. By harnessing bi-material thermal expansion mismatch in the double-layer beam buckling, a significantly broadened stiffness tuning range is observed. A comprehensive parameter analysis and the corresponding design of the unit cell are performed. The metastructures are then investigated in two original modulatable vibration isolation scenarios: In Scenario 1, under varying loading masses, the initial vibration isolation frequency of the metastructure is managed to keep constant; In Scenario 2, under constant loading masses, the initial vibration isolation frequency of the metastructure is decreased so as to reach the vibration isolation region. Overall, the proposed thermally actuated design strategy offers an innovative approach for the creation of compact metastructures that are adaptable to complex working environments with a dual low-frequency vibration isolation function in case of both varying and constant load-bearing conditions.

集成元结构既能隔离低频振动，又能保持静态承载能力，在实际工程应用中表现出优异的性能。然而，在不同的承载条件下调节其隔振功能仍然是一个挑战。为了解决这一挑战，我们提出了一种新的方法，其中元结构包括热驱动的单位细胞。首先建立了双材料双层弯曲梁元结构单元胞的理论模型，该模型可以通过热致动调节有效刚度特性。对单晶胞的静态特性进行了理论分析和数值验证。通过利用双材料热膨胀失配在双层梁屈曲中，观察到一个显着拓宽的刚度调谐范围。进行了综合参数分析和相应的单体电池设计。然后研究了两种初始可调隔振方案：在方案1中，在不同载荷质量下，元结构的初始隔振频率保持不变；在场景2中，在荷载质量不变的情况下，元结构的初始隔振频率减小，从而达到隔振区域。总的来说，提出的热驱动设计策略为创建紧凑型元结构提供了一种创新方法，这种结构可以适应复杂的工作环境，在变化和恒定的承重条件下具有双重低频隔振功能。

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引用次数: 0

A finite element investigation into the in-plane load bearing behaviour of traditional timber-dry stone (Kath-Kuni) Masonry Walls 传统木-干石（kathi - kuni）砌体墙面内承载性能的有限元研究

IF 6.4 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2026-02-07 DOI: 10.1016/j.engstruct.2026.122249

Hisham Tariq , Deepak Kumar , Ashutosh Kumar , Vasilis Sarhosis

This paper presents a novel computational investigation into the in-plane response of traditional timber dry-stone masonry (Kath-Kuni) structure using non-linear three-dimensional finite element modelling. The investigation commenced with component-level numerical modelling of various connections within Kath-Kuni walls, validated using published experimental tests. This was followed by the development of a full-scale finite element model of a Kath-Kuni wall aiming to capture the heterogeneous behaviour of this unique timber-stone masonry structure as well as the complex interactions between its various structural components. A quasi‑static pushover analysis of the wall was carried out followed by a parametric study to quantify the influence of pre‑compression and interface friction coefficients on the in-plane response of these walls. The numerical models were able to capture the distribution of stress within the connections as well as at the contact interfaces, thereby providing comprehensive insights into the load-transfer mechanism and critical areas of stress concentration. The numerical analysis of full-scale wall highlighted the critical role of Kadil (dowel) connections, longitudinal timber beams and sandstones in bearing the in-plane loads. Moreover, the results showed that in‑plane strength increased nearly linearly with pre‑compression, increasing stone–stone friction from 0.60 to 0.70 increased the in-plane strength of the wall by 10–15 %, whereas the friction coefficients between timber–timber and timber–stone interfaces have marginal effect on the strength. These outcomes provide first-of-their-kind insights into the load-bearing mechanisms governing the in-plane response of Kath-Kuni walls.

本文采用非线性三维有限元模型对传统木材干石砌体结构的面内响应进行了新的计算研究。调查开始时，对Kath-Kuni墙内的各种连接进行了构件级数值模拟，并使用已公布的实验测试进行了验证。随后开发了一个全尺寸的Kath-Kuni墙有限元模型，旨在捕捉这种独特的木石砌体结构的异质行为，以及其各种结构组件之间的复杂相互作用。对墙体进行了准静力推覆分析，然后进行了参数化研究，以量化预压缩系数和界面摩擦系数对这些墙体面内响应的影响。数值模型能够捕获连接内以及接触界面的应力分布，从而提供对载荷传递机制和应力集中关键区域的全面见解。全尺寸墙体的数值分析强调了榫连接、纵向木梁和砂岩在承受面内荷载中的关键作用。结果表明：随着预压的增加，墙体的面内强度几乎呈线性增加，石墙摩擦从0.60增加到0.70，墙体的面内强度提高了10-15 %，而木材-木材和木材-石材界面的摩擦系数对强度的影响微乎其微。这些结果首次提供了对控制kathi - kuni墙面内响应的承载机制的见解。

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引用次数: 0

Nonlinear damage evolution in thick composite laminates with bolted joints under through-thickness stress gradients: Simulation and experiment 全厚应力梯度下螺栓连接复合材料层合板非线性损伤演化：模拟与实验

IF 6.4 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2026-02-07 DOI: 10.1016/j.engstruct.2026.122301

Zhaoqi Li , Bo Wen , Peng Xiao , Qian Li , Zhen Zhang

As critical load-transfer elements in modern aircraft, bolted composite joints enable efficient structural integration. However, their long-term reliability is challenged by the complex, nonlinear damage mechanisms that develop in thick laminates. This study systematically investigates the failure mechanisms of bolted composite joints across different thicknesses (5 mm, 7.5 mm, and 10 mm) through integrated experimental and numerical approaches. A 3D solid finite element model was developed to simulate the mechanical behavior of bolted composite joints. The model incorporates a modified Puck criterion, which integrates the thickness-to-diameter ratio (T/D) to capture interlaminar strength reduction and gradient-driven failure mechanisms in thick laminates. Correlation of AE clustering (PCA/K-means++), DIC strain analysis, and finite element simulations provides strong data-supported validation of the physical failure mechanisms. Results indicate that increased laminate thickness induces significant through-thickness stress gradients, exacerbating interlaminar stress concentrations and promoting early matrix damage and delamination. The proposed model shows enhanced agreement with experimental observations in terms of ultimate strength, failure patterns, and strain distribution. These results provide a reliable foundation for the design and optimization of thick bolted composite joints in aerospace applications.

螺栓复合材料接头作为现代飞机的关键载荷传递元件，能够实现高效的结构集成。然而，它们的长期可靠性受到复杂的非线性损伤机制的挑战，这些损伤机制在厚层压板中发展。本研究通过综合实验和数值方法，系统研究了不同厚度（5 mm、7.5 mm和10 mm）螺栓复合连接的破坏机制。建立了三维实体有限元模型来模拟螺栓复合连接的力学行为。该模型采用了改进的Puck准则，该准则集成了厚度与直径比（T/D），以捕获厚层压板的层间强度降低和梯度驱动的破坏机制。AE聚类（PCA/ k - memeans ++）、DIC应变分析和有限元模拟的相关性为物理破坏机制提供了强有力的数据支持验证。结果表明，层压厚度的增加会引起显著的跨层应力梯度，加剧层间应力集中，促进早期基体损伤和分层。所提出的模型在极限强度、破坏模式和应变分布方面与实验观察结果更加吻合。这些结果为航空航天应用中厚螺栓复合材料连接的设计和优化提供了可靠的依据。

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引用次数: 0

Experimental study on seismic performance of prestressed InorgBam beam-to-column connections 预应力InorgBam梁柱连接抗震性能试验研究

IF 6.4 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2026-02-06 DOI: 10.1016/j.engstruct.2026.122291

Hang Yin , Xin Zhang , Ernian Zhao , Xilin Lu

Inorganic-bonded bamboo composite (InorgBam) is a novel engineered bamboo product fabricated using bamboo fiber bundles bonded with a magnesium oxysulfide (MOS) inorganic adhesive, thereby providing improved fire resistance, long-term durability, and potential for large cross-sectional structural applications compared with conventional bamboo and timber products. The connection performance of InorgBam structures is crucial for overall safety and post-earthquake recoverability. However, traditional bolted connections often sustain large residual deformations during seismic events. This paper investigates the seismic performance of InorgBam beam-to-column connections incorporating post-tensioned high-strength (HS) steel strands and steel connectors. The effects of different self-centering configurations on seismic performance were experimentally evaluated. The benchmark connection with a Π-shaped slotted-in steel connector exhibited good initial load-carrying capacity but suffered from large residual deformation after cyclic loading, with a relative self-centering capability (RSC) of 0.71. The prestressed connection without effective beam-end confinement experienced brittle splitting failure at the beam end, limiting the activation of the restoring force provided by the HS steel strands. In contrast, the connection combining an external energy-dissipating steel jacket with HS steel strands achieved excellent self-centering performance (RSC = 0.95) and stable energy dissipation. The connection incorporating HS steel strands together with a Π-shaped steel connector and an external steel jacket attained the highest initial stiffness and ultimate load capacity. However, the excessive stiffness restrained rocking behavior and reduced the self-centering capability (RSC = 0.81). Therefore, the enhanced energy-dissipating steel jacket is recommended for self-centering InorgBam beam-to-column connections, as the measure balances ductility, damage control, and self-centering capacity, while avoiding the negative effect of excessive stiffness on the rotational recovery of the connection.

无机粘结竹复合材料（InorgBam）是一种新型工程竹产品，它将竹纤维束与氧硫化镁（MOS）无机粘合剂粘合而成，与传统的竹材产品相比，它具有更好的耐火性、长期耐久性和大截面结构应用的潜力。InorgBam结构的连接性能对整体安全性和震后恢复能力至关重要。然而，传统的螺栓连接在地震活动中往往承受较大的残余变形。本文研究了结合后张高强钢绞线和钢连接件的InorgBam梁柱连接的抗震性能。实验评估了不同自定心结构对结构抗震性能的影响。基准连接采用Π-shaped开槽钢接头，初始承载能力较好，但循环加载后残余变形较大，相对自定心能力（RSC）为0.71。无有效梁端约束的预应力连接在梁端发生脆性断裂破坏，限制了HS钢绞线提供的恢复力的激活。外置消能钢护套与HS钢绞线组合的连接具有优异的自定心性能（RSC = 0.95）和稳定的消能。将HS钢绞线与Π-shaped钢连接器和外部钢护套结合在一起的连接获得了最高的初始刚度和极限承载能力。然而，过高的刚度抑制了摇摆行为，降低了自定心能力（RSC = 0.81）。因此，推荐在自定心InorgBam梁柱连接中使用增强耗能钢护套，因为该措施平衡了延性、损伤控制和自定心能力，同时避免了过度刚度对连接旋转恢复的负面影响。

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引用次数: 0

Evaluation of crack repair level by measuring the electrical resistance of the crack and repair area 通过测量裂纹和修补区域的电阻来评价裂纹修补水平

IF 6.4 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2026-02-06 DOI: 10.1016/j.engstruct.2026.122269

Tae Uk Kim, Dong Joo Kim

Evaluation of the crack repair level (CRL) is crucial for restoring the mechanical performance of damaged concrete. Current methods rely on surface inspection or complex procedures, making reliable real-time assessment difficult. This study proposes an innovative method for estimating CRL using the electrical resistance of the crack and repair area. When a repair material containing conductive fillers is injected, current flow is restored, and electrical resistance decreases. The CRL is then inferred from the change in electrical resistance relative to the injected volume fraction. Electrical field analysis produced piecewise linear equations linking electrical resistance to CRL. Experiments conducted under varying temperature and relative humidity (RH) conditions verified the method’s accuracy. For a 40 mm crack, electrical resistance decreased from 1.38 to 0.59 kΩ as the CRL increased from 0 % to 100 % at 25 ℃ and 60 % RH. Analytical and experimental results differed by only 1–4 %, with determination coefficients greater than 0.995. This method provides a rapid and accurate tool for real-time evaluation of crack repairs, aiding structural maintenance.

裂缝修复水平的评价是损伤混凝土力学性能恢复的关键。目前的方法依赖于表面检查或复杂的程序，难以进行可靠的实时评估。本研究提出了一种利用裂纹和修补区域的电阻来估计CRL的创新方法。当注入含有导电填料的修复材料时，电流恢复流动，电阻降低。然后从相对于注入体积分数的电阻变化推断出CRL。电场分析产生了将电阻与CRL联系起来的分段线性方程。在不同温度和相对湿度（RH）条件下进行的实验验证了该方法的准确性。在25℃、60 % RH条件下，当CRL从0 %增加到100 %时，40 mm裂纹的电阻从1.38降低到0.59 kΩ。分析结果与实验结果仅相差1 ~ 4 %，测定系数均大于0.995。该方法为裂缝修复的实时评估提供了快速、准确的工具，有助于结构维修。

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引用次数: 0

Development and optimization of a novel pin-loaded CFRP strap: A hybrid experimental-numerical approach 一种新型引脚加载CFRP带的开发与优化：实验-数值混合方法

IF 6.4 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2026-02-06 DOI: 10.1016/j.engstruct.2026.122293

Weidong Chen , Yanyang Pan , Gongyi Xu , Mingsai Xu , Jing Gao

Self-anchored carbon fiber reinforced polymer (CFRP) strap cables eliminate bulky metallic anchorages, yet stress concentrations within the curved anchorage zone continue to limit their load-carrying efficiency. This study integrates experimental testing, finite element (FE) simulations, and analytical modeling, aiming to address this limitation through strap geometry optimization and interfacial behavior characterization. Static tensile tests were first performed on straps with wedge angles of 27°, 29°, and 33°. The results showed that reducing the wedge angle significantly improves load capacity, with the 27° strap achieving the highest average fracture stress above 2000 MPa. These experiments were then used to validate a three-dimensional FE model, which subsequently enabled a systematic parametric analysis across wedge angles, strap layers, and interface friction coefficients. The FE-generated database was employed to evaluate the predictive accuracy of an existing orthotropic thick-walled ring formulation. By introducing a correction factor that explicitly accounts for wedge angle and interfacial friction, the model was extended to reproduce load capacities with an error less than 3 % and to capture clear parametric trends. This modified closed-form formulation provides the first friction-sensitive design tool for CFRP straps, offering practical guidance for efficient lightweight cable systems in long-span structures.

自锚碳纤维增强聚合物（CFRP）带状电缆消除了笨重的金属锚固，但弯曲锚固区内的应力集中继续限制其承载效率。本研究将实验测试、有限元（FE）模拟和分析建模相结合，旨在通过条带几何优化和界面行为表征来解决这一限制。首先对楔形角为27°、29°和33°的绑带进行静态拉伸试验。结果表明，减小楔角可显著提高承载能力，27°带的平均断裂应力在2000 MPa以上达到最高；这些实验随后用于验证三维有限元模型，该模型随后能够进行系统的参数分析，包括楔角、带层和界面摩擦系数。利用有限元生成的数据库对现有正交各向异性厚壁环公式的预测精度进行了评价。通过引入一个明确考虑楔形角和界面摩擦的修正因子，该模型被扩展到以小于3 %的误差再现载荷能力，并捕获清晰的参数趋势。这种改进的封闭形式公式为CFRP带提供了第一个摩擦敏感设计工具，为大跨度结构中高效的轻质索系统提供了实用指导。

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引用次数: 0

Experimental investigation and interpretable machine learning prediction of the axial compressive behavior of prefabricate F3T-shaped thin concrete-encased steel columns 预制f3t型薄混凝土包钢柱轴压行为的实验研究和可解释的机器学习预测

IF 6.4 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2026-02-06 DOI: 10.1016/j.engstruct.2026.122294

Xiao-Wu Liu, Xue-Chun Liu, Xuesen Chen, Kun Meng, De-Fang Liu

A novel prefabricated F3T-shaped thin concrete-encased steel column (F3T-TCES) was proposed to address corrosion, fire resistance, and local buckling in special-shaped steel columns. Axial compression tests were performed on nine F3T-TCES columns to investigate the effects of six stirrup configurations. All specimens exhibited strength failure modes. Type E and Type F stirrup could effectively limit crack propagation and delay crack development. The material utilization coefficients of all specimens are greater than 1.0, demonstrating full utilization of material strengths. Type F stirrup required no on-site welding and provided the highest construction efficiency, and is therefore recommended. A refined finite-element model was established in ABAQUS and validated against the test results. Parametric studies reveals that increasing web thickness is more effective in enhancing the peak load than increasing flange thickness. The combination of Q355 steel with C30 to C50 concrete ensures stable axial compressive behavior and high material utilization coefficients. Stirrup spacing had a slight effect on the axial resistance, and 100 mm spacing is recommended. Increasing the steel flange concrete cover from 45 mm to 70 mm significantly reduces concrete cracking. Peak resistance and design resistance formulas considering the confined concrete strength enhancement coefficient k were proposed and validated. A database containing 962 samples was established, and five different machine learning models were trained to predict the peak resistance and initial stiffness. The eXtreme Gradient Boosting (XGBoost) model achieved the highest accuracy and is recommended for engineering prediction.

提出了一种新型预制f3t型薄混凝土包覆钢柱（F3T-TCES），以解决异形钢柱的腐蚀、防火和局部屈曲问题。对9根F3T-TCES柱进行了轴压试验，研究了6种箍筋配置对柱的影响。所有试件均表现出强度破坏模式。E型和F型箍筋能有效地限制裂纹扩展，延缓裂纹发展。所有试件的材料利用系数均大于1.0，充分利用了材料强度。F型箍筋不需要现场焊接，提供最高的施工效率，因此推荐使用。在ABAQUS中建立了精细化有限元模型，并与试验结果进行了验证。参数化研究表明，增加腹板厚度比增加翼缘厚度更能有效地提高峰值荷载。Q355钢与C30至C50混凝土的组合保证了稳定的轴压性能和高的材料利用系数。马镫间距对轴向阻力影响较小，建议间距为100 mm。将钢法兰混凝土盖板由45 mm增加到70 mm，可显著减少混凝土开裂。提出并验证了考虑约束混凝土强度增强系数k的峰值阻力和设计阻力公式。建立了包含962个样本的数据库，并训练了五种不同的机器学习模型来预测峰值阻力和初始刚度。极端梯度增强（XGBoost）模型达到了最高的精度，被推荐用于工程预测。

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引用次数: 0

An incremental broad ensemble learning framework for the identification of structural damage in conditions of data scarcity and non-stationarity 一种用于识别数据稀缺和非平稳性条件下结构损伤的增量式广义集成学习框架

IF 6.4 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2026-02-06 DOI: 10.1016/j.engstruct.2026.122261

Xinwei Wang , Zhihao Wang , Shixuan Yang , Shuaiqiang Wei , Tianlong Wang , Muhammad Moman Shahzad

The limited availability of structural damage samples in engineering practice, together with temporal variability in data acquisition, remains a key challenge for accurate intelligent structural damage detection. To overcome these obstacles, this study introduces an incremental broad ensemble learning framework for damage identification that utilizes drift sensing and node tracking, termed IBEL-DSNT. In particular, the concepts of dynamic weight allocation and incremental mechanisms for samples, broad learning systems, and feature nodes are first clarified to tackle the recognition challenges posed by insufficient samples and difficult-to-classify instances. This methodology capitalizes on the mathematical characteristics of pseudo-inverse computation to significantly improve the efficiency of model training. Following this, an adaptive node incremental mechanism, regulated by accuracy thresholds, is established to autonomously manage the scale of nodes and variations in precision, effectively alleviating concerns of excessive computational burden and severe overfitting that arise from unchecked node expansion during broad learning. In addition, a drift-detection-based node topology optimization strategy is developed to synchronize node evolution with model accuracy during incremental learning. Validation through three structural case studies demonstrates that the proposed approach attains a recognition accuracy exceeding 97 % with merely 150 training samples. In comparison to baseline methods characterized by simpler architectures, the suggested framework achieves a minimum of a 2 % enhancement in recognition accuracy by means of regulated increases in mapping nodes. With a moderate augmentation of both mapping and enhancement nodes, the rate of node expansion remains as low as 0.003 s per node, whilst improvements in recognition accuracy can surpass 20 %. Overall, the results confirm that the proposed method provides stable and accurate real-time damage identification, with strong adaptability to concept drift and robust performance under small-sample conditions.

工程实践中结构损伤样本的有限可用性，以及数据采集的时变性，仍然是准确智能结构损伤检测的关键挑战。为了克服这些障碍，本研究引入了一种增量式的广泛集成学习框架，用于利用漂移传感和节点跟踪进行损伤识别，称为IBEL-DSNT。特别是，首先阐明了样本、广义学习系统和特征节点的动态权重分配和增量机制的概念，以解决样本不足和难以分类的实例所带来的识别挑战。该方法利用伪逆计算的数学特性，显著提高了模型训练的效率。在此基础上，建立了一种受精度阈值调节的自适应节点增量机制，对节点规模和精度变化进行自主管理，有效缓解了在广泛学习过程中由于节点无节制扩展而导致的计算负担过重和严重过拟合问题。此外，提出了一种基于漂移检测的节点拓扑优化策略，使增量学习过程中节点进化与模型精度同步。通过三个结构案例研究的验证表明，该方法在仅150个训练样本的情况下，识别准确率超过97% %。与以更简单架构为特征的基线方法相比，建议的框架通过调节映射节点的增加，在识别精度上实现了至少2 %的提高。在适度增加映射和增强节点的情况下，节点扩展率保持在每节点0.003 s的低水平，而识别准确率的提高可以超过20% %。结果表明，该方法在小样本条件下具有较强的概念漂移适应性和鲁棒性，实时损伤识别稳定、准确。

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引用次数: 0

Low-velocity impact response of bio-inspired multi-sinusoidal corrugated sandwich structure 仿生多正弦波纹夹层结构的低速冲击响应

IF 6.4 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2026-02-06 DOI: 10.1016/j.engstruct.2026.122321

Jing Sun , Honghui Li , Haikun Peng , Chao Ding , Lewei Yan , Xinmei Xiang

This study investigated the low-velocity impact response of bio-inspired multi-sinusoidal corrugated (BMSC) sandwich structures inspired by marine shells. A comprehensive experimental study was conducted with impact energies ranging from 45.09 J to 280.83 J. Finite element simulations using ABAQUS provided detailed insights into the progressive damage mechanisms and impact responses of various BMSC sandwich configurations (n = 1–5). Four distinct failure modes were categorized, corresponding to different impact energy levels, ranging from localized deformation to complete penetration. The impact force-time and impact force-displacement curves, along with energy absorption characteristics, were analyzed. Results revealed that BMSC sandwich structures exhibit superior impact resistance compared to traditional corrugated designs. The BMSC (n = 3) achieved the highest specific energy absorption of 2.38 J/g, exceeding the traditional design by over 39 % and more than doubling that of titanium-based carbon-fiber/epoxy laminates, demonstrating significantly enhanced energy absorption efficiency and impact protection performance. These advantages stem from the bio-inspired core design, which facilitates and guides progressive deformation, delaying failure initiation and enhancing energy absorption capability. The research provides an in-depth understanding of the impact response, damage mechanisms, and energy absorption efficiency of BMSC sandwich structures, highlighting their suitability for protective structure applications.

研究了受海洋贝壳启发的仿生多正弦波纹夹层结构的低速冲击响应。在45.09 J ~ 280.83 J的冲击能量范围内进行了全面的实验研究。使用ABAQUS进行有限元模拟，可以详细了解各种BMSC夹层结构的渐进损伤机制和冲击响应（n = 1-5）。根据不同的冲击能量等级，从局部变形到完全穿透，划分了四种不同的破坏模式。分析了冲击力-时间曲线和冲击力-位移曲线以及能量吸收特性。结果表明，与传统的波纹结构相比，BMSC夹层结构具有更好的抗冲击性。BMSC （n = 3）实现了最高的比能吸收，达到2.38 J/g，比传统设计高出39 %以上，是钛基碳纤维/环氧复合材料的两倍多，显著提高了能量吸收效率和抗冲击性能。这些优势源于仿生核心设计，促进和引导渐进变形，延迟破坏起始，增强能量吸收能力。该研究深入了解了BMSC夹层结构的冲击响应、损伤机制和能量吸收效率，突出了其在防护结构应用中的适用性。

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引用次数: 0

Effects of wind barriers on the running safety of trains on bridges under different turbulence intensities 不同湍流强度下风障对桥梁上列车运行安全的影响

IF 6.4 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2026-02-06 DOI: 10.1016/j.engstruct.2026.122307

Haobo Liang , Yunfeng Zou , Chenzhi Cai , Xiangrong Guo , Xuhui He

Wind barriers (WBs) serve as a practical approach to enhance the operational safety of trains running on bridges exposed to strong crosswinds. However, the wind environment at bridge sites located in complex mountainous regions often exhibits pronounced high turbulence characteristics. This study investigates the actual protective performance of WBs in such highly turbulent environments, focusing on their aerodynamic shielding effects under varying turbulence intensities (I_u). Wind tunnel tests were conducted to examine the aerodynamic characteristics of the train-bridge (TB) system under different wind conditions, with I_u ranging from 4.88% to 13.47%. Based on the experimental data, coupled wind-train-bridge (WTB) dynamic response analyses were conducted to quantitatively assess how different I_u influence the operational safety of trains. The results demonstrate that the unsteady aerodynamic loads induced by high I_u adversely affect train operational safety. Installing WBs effectively mitigates these detrimental effects. However, their protective performance is significantly influenced by I_u, and the safety indices deteriorate under highly turbulent conditions. This study emphasizes the importance of accounting for the actual turbulence characteristics of the wind field in WB design. The findings offer theoretical guidance for the wind-resistance optimization of long-span railway bridges in mountainous regions.

防风屏障（WBs）是一种实用的方法，可以提高在强侧风的桥梁上运行的列车的运行安全性。然而，位于复杂山区的桥址风环境往往表现出明显的高湍流特征。本研究考察了WBs在这种高湍流环境下的实际防护性能，重点研究了其在不同湍流强度（Iu）下的气动屏蔽效果。采用风洞试验研究了列车-桥梁（TB）系统在不同风况下的气动特性，风洞试验的风洞系数为4.88% ~ 13.47%。在试验数据的基础上，进行了风-车-桥耦合动力响应分析，定量评价了不同工况对列车运行安全的影响。结果表明，高流量引起的非定常气动载荷对列车运行安全产生不利影响。安装WBs有效地减轻了这些不利影响。然而，它们的防护性能受到Iu的显著影响，在高湍流条件下安全指标下降。本研究强调了在WB设计中考虑实际风场湍流特性的重要性。研究结果为山区大跨度铁路桥梁的抗风优化提供了理论指导。

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引用次数: 0