Engineering Structures最新文献_第6页

Systematic load tests for the preservation of railway masonry arch bridges – Experimental concept and insights from static loading 铁路砌体拱桥保存的系统荷载试验。静态荷载的试验概念和见解

IF 6.4 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2026-04-15 Epub Date: 2026-01-23 DOI: 10.1016/j.engstruct.2026.122166

Jenny Keßler, Chongjie Kang, Steffen Marx

The preservation and continued use of historical arch bridges are of particular relevance, as they constitute a substantial proportion of the existing bridge stock in Germany and are of both infrastructural and cultural significance. To develop standardized methods for assessing these existing structures, a series of load tests has been carried out. This work establishes the requirements for selected bridges, validates the applied measurement concepts, and outlines the corresponding test design and procedures. As a result, the evaluation of static load positions demonstrates the remarkable robustness of these structures, characterized by an elastic load-bearing behavior under service loads and an effective distribution of loads across the entire cross-section, even in the presence of damage. Besides, a comparison of different structures reveals the significant influence of filling on the displacement behavior, whereas the impact of subsoil-structure interaction proves to be minor, even after long-term service. Furthermore, the results underscore conservative assumptions in current recalculations standards, particularly concerning the effective cross-section and the consideration of the spandrel walls in the structural assessment.

保存和继续使用历史拱桥是特别重要的，因为它们构成了德国现有桥梁存量的很大一部分，具有基础设施和文化意义。为了制定评估这些现有结构的标准化方法，进行了一系列负荷试验。这项工作建立了选定桥梁的要求，验证了应用的测量概念，并概述了相应的测试设计和程序。因此，对静载荷位置的评估表明，这些结构具有显著的鲁棒性，其特点是在使用载荷下具有弹性承载性能，即使在存在损伤的情况下，载荷也能有效地分布在整个截面上。此外，不同结构的对比表明，填筑对位移行为的影响显著，而地基-结构相互作用的影响较小，即使在长期使用后也是如此。此外，结果强调了目前重新计算标准中的保守假设，特别是关于有效截面和结构评估中对拱墙的考虑。

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引用次数: 0

Encodable design of a negative stiffness cylindrical metastructure based on local bulking with multi-step deformation and superior energy absorption 基于多步变形和高能量吸收的负刚度圆柱元结构的可编码设计

IF 6.4 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2026-04-15 Epub Date: 2026-01-23 DOI: 10.1016/j.engstruct.2026.122226

Shun Wang , Hai-Tao Liu , Guang-Bin Cai

The use of soft materials with large elastic strains as matrix materials and rigid support frameworks that do not participate in deformation limits the energy absorption of negative stiffness metastructures. Here, a negative stiffness cylindrical metastructure (NSCM) with multi-step deformation is designed to enhance the applicability of conventional two-dimensional negative-stiffness metastructures. Star-shaped and star-rhombic structures are introduced as deformable flexible support frames for inclined thin walls, which deform plastically in multi-step deformations, resulting in a significant enhancement of energy-absorbing efficiency. Two types of NSCM are proposed, and the effects of wall thickness and out-of-plane width on deformation stability and compressive mechanical properties are investigated. Thanks to the snap-through behavior of the inclined thin wall and the rotational deformation of the star-rhombic structure, the stress-strain curves of NSCM show discontinuous negative stiffness characteristics. In order to extend the mechanical response modulation range and enhance the deformation stability, the encodable NSCM is further proposed based on the digital encoding method. Programming of deformation behavior and mechanical properties, including specific energy absorption and densification strain, can be achieved by mixing the encoding of “1” and “0” and modulating the encoding ratio of each component. Encodable NSCM realizes the smooth transition of the stress-strain curve from low stress to high stress. Stepwise transition avoids the generation of excessive impact force in a short period of time, which is beneficial to enhance the protective effect and provide new ideas for the design of energy absorption systems in the field of protective engineering.

采用弹性应变大的软质材料作为基体材料和不参与变形的刚性支撑框架，限制了负刚度元结构的能量吸收。为了提高传统二维负刚度元结构的适用性，设计了一种多级变形负刚度圆柱元结构（NSCM）。采用星形和星形结构作为倾斜薄壁的可变形柔性支撑框架，在多步变形中进行塑性变形，从而显著提高吸能效率。提出了两种类型的NSCM，研究了壁厚和面外宽度对变形稳定性和压缩力学性能的影响。由于倾斜薄壁的贯通行为和星形结构的旋转变形，NSCM的应力-应变曲线呈现不连续的负刚度特征。为了扩大机械响应调制范围，提高变形稳定性，在数字编码方法的基础上，进一步提出了可编码的NSCM。通过混合编码“1”和“0”，调节各组分编码比例，可以实现变形行为和力学性能的编程，包括比能吸收和致密化应变。可编码NSCM实现了应力-应变曲线从低应力到高应力的平滑过渡。阶梯式过渡避免了短时间内产生过大的冲击力，有利于增强防护效果，为防护工程领域的吸能系统设计提供新思路。

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引用次数: 0

On the interlaminar tensile strength of curved ceramic matrix composite beams 弯曲陶瓷基复合梁层间抗拉强度研究

IF 6.4 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2026-04-15 Epub Date: 2026-01-22 DOI: 10.1016/j.engstruct.2026.122233

Wenbo Li , Jintao Zhu , Mingyang Chen , Feipeng Wang , Zeshuai Yuan , Yu Dai , Pengwei Mou , Yajin Mi , Yuankui Lv , Junping Li , Liao-Liang Ke

Accurate measurement of the interlaminar tensile strength (ILTS) is crucial to characterize the delamination failure of the ceramic matrix composites (CMC). Conventional testing method based on ASTM D6415 relies on estimation of moduli of the curved beam, which is ambiguous in practice. In this paper we develop a self-consistent testing method combining the four-point bending test and Digital Image Correlation (DIC) technique. The four-point bending test is responsible for measuring the curved beam strength and the DIC is in charge of extracting the in-situ strains within the curved region. We develop a formula for deriving the moduli of the curved beam from in-situ strains obtained by DIC measurement. In this way, the ILTS can be fully determined based on the testing data without any prior knowledge or estimation on the moduli. With the help of the developed method, the ILTS of the curved beam made of carbon fiber-reinforced CMC is measured. The experiment shows that the failure mode of the CMC curved beam under four-point bending is delamination, and ILTS measurement based on the proposed method is efficient, robust and reliable. We discuss the dependence of measured ILTS value on the moduli to address the necessity of accurate moduli estimation. The effect of the location of strain extraction from DIC is examined in order to reduce the errors of measurement.

层间抗拉强度的准确测量是表征陶瓷基复合材料脱层破坏的关键。基于ASTM D6415的传统测试方法依赖于曲线梁模量的估计，在实际应用中具有模糊性。本文提出了一种结合四点弯曲试验和数字图像相关（DIC）技术的自洽检测方法。四点弯曲试验负责测量弯曲梁的强度，DIC负责提取弯曲区域内的原位应变。我们建立了由DIC测量得到的原位应变推导弯梁模量的公式。这样，可以完全根据测试数据确定ILTS，而无需对模进行任何先验知识或估计。利用所建立的方法，对碳纤维增强CMC弯曲梁的热应力进行了测量。实验表明，CMC弯曲梁在四点弯曲作用下的破坏模式为分层破坏，基于该方法的ILTS测量是高效、鲁棒和可靠的。我们讨论了测量ILTS值对模的依赖关系，以解决精确模估计的必要性。为了减小测量误差，研究了应变提取位置对测量结果的影响。

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引用次数: 0

Vortex-induced vibration control of wind turbine towers using a tuned mass damper-inerter: The method of multiple scales analysis 基于调谐质量阻尼器的风力发电塔涡激振动控制：多尺度分析方法

IF 6.4 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2026-04-15 Epub Date: 2026-01-22 DOI: 10.1016/j.engstruct.2026.122188

Feng Qian , Yabin Liao

As wind turbines grow taller and more slender, their flexibility and low inherent damping increase vulnerability to vortex-induced vibrations (VIV), threatening structural integrity and fatigue life. While traditional tuned mass dampers (TMDs) can mitigate VIV, their large mass and displacement stroke conflict with compact turbine designs. This study develops a novel analytical nonlinear model of a tuned mass damper-inerter (TMDI) coupled with the wind turbine tower, capturing the fluid–structure-TMDI interaction and deriving primary and secondary resonance responses using the method of multiple scales. Analytical solutions for primary and secondary resonance responses are derived using the method of multiple scales and validated against numerical simulations of the NREL 5-MW baseline turbine. The analytical results, complemented by energy flow analysis, show that the TMDI can provide vibration suppression performance comparable to that of a conventional TMD while reducing the displacement stroke of the auxiliary mass. The energy flow analysis further quantifies the trade-off between stroke reduction and control effectiveness, and is used to identify a range of inerter mass ratios for design consideration. Dynamic stress analysis further demonstrates potential fatigue life improvement. These findings highlight the promise of TMDIs as compact, high-performance vibration mitigation devices and provide a rigorous analytical framework to inform their design in next-generation wind turbines.

随着风力涡轮机变得越来越高、越来越细长，它们的灵活性和较低的固有阻尼增加了对涡激振动（VIV）的脆弱性，威胁到结构的完整性和疲劳寿命。虽然传统的调谐质量阻尼器（TMDs）可以减轻涡激振动，但它们的大质量和位移冲程与紧凑型涡轮设计相冲突。本文建立了一种新型的调谐质量阻尼器（TMDI）与风力发电机组塔架耦合的非线性解析模型，利用多尺度方法捕捉了流固耦合作用，并推导了其主共振和次共振响应。采用多尺度法推导了主共振和二次共振响应的解析解，并通过NREL 5-MW基准涡轮机的数值模拟进行了验证。分析结果与能量流分析相结合，表明TMDI在减小辅助质量位移冲程的同时，具有与传统TMD相当的减振性能。能量流分析进一步量化了冲程减少和控制效果之间的权衡，并用于确定设计考虑的质量比范围。动应力分析进一步证明了潜在的疲劳寿命改善。这些发现突出了TMDIs作为紧凑、高性能减振装置的前景，并为下一代风力涡轮机的设计提供了严格的分析框架。

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引用次数: 0

Shake table tests of gravity well-inspired double friction pendulum systems under Bi-directional ground motions 双向地震动下重力激励双摩擦摆系统的振动台试验

IF 6.4 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2026-04-15 Epub Date: 2026-02-05 DOI: 10.1016/j.engstruct.2026.122278

Sasa Cao , Xiaolong Sheng , Haojie Qiu , Osman E. Ozbulut

Conventional friction pendulum isolators rely on fixed spherical surfaces or discrete sliding stages, which constrain their ability to provide smooth stiffness adaptation and limit their frictional energy dissipation. To address these limitations, this study investigates a novel gravity-well double friction pendulum system (GW-DFPS) that employs a variable-curvature sliding surface to elongate displacement trajectories and enhance energy dissipation while enabling continuous stiffness softening at large displacements. Through a series of shake table experiments, a scaled bridge superstructure isolated with GW-DFPS was subjected to a range of uni- and bi-directional ground motions representing different site conditions and seismic intensities. Experimental results confirm that the system exhibits the intended softening behavior at larger displacements, effectively limiting force demands while accommodating significant lateral motions. Comparisons between unidirectional and bidirectional excitations highlight that the latter can lead to increased displacement demands, though with moderated acceleration responses. Residual displacements were small across all tests. Energy-based evaluations revealed a clear trade-off between kinetic and gravitational potential energy, with frictional dissipation increasing with sliding velocity. Overall, the GW-DFPS demonstrates strong potential as a next-generation seismic isolation device capable of sustaining large displacements while reducing shear forces transmitted to the superstructure.

传统的摩擦摆隔离器依赖于固定的球面或离散的滑动级，这限制了它们提供平滑刚度适应的能力，并限制了它们的摩擦能量耗散。为了解决这些限制，本研究研究了一种新型重力井双摩擦摆系统（GW-DFPS），该系统采用变曲率滑动面来延长位移轨迹，增强能量耗散，同时在大位移下实现连续刚度软化。通过一系列的振动台试验，对采用GW-DFPS隔离的桥梁上部结构进行了一系列代表不同场地条件和地震烈度的单向和双向地震动。实验结果证实，该系统在较大位移下表现出预期的软化行为，有效地限制了力需求，同时适应了显著的横向运动。单向激励和双向激励的比较表明，双向激励会导致位移需求增加，尽管加速度响应会有所缓和。所有试验的残余位移都很小。基于能量的评估揭示了动能和重力势能之间的明显平衡，摩擦耗散随着滑动速度的增加而增加。总的来说，GW-DFPS作为下一代地震隔离装置具有强大的潜力，能够承受大位移，同时减少传递到上部结构的剪切力。

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引用次数: 0

Vehicle-induced bridge dynamic response monitoring and displacement estimation using distributed acoustic sensing 基于分布式声传感的车辆诱导桥梁动力响应监测与位移估计

IF 6.4 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2026-04-15 Epub Date: 2026-02-14 DOI: 10.1016/j.engstruct.2026.122333

Yichen Zhong , Chen Gu , Peng Wu , Zhanxiong Ma , Zhi Yuan , Zhuoyu Chen , Jiawei He , Chenrui Fan , Jiahui Wang , Dikai Wang , Xinzheng Lu

Many bridges in operation today are aging, highlighting the need for advanced structural health monitoring solutions to ensure continued safety and performance. In this study, we propose an integrated framework that leverages Distributed Acoustic Sensing (DAS) with self-deployed fibers to monitor vehicle-induced dynamic response of bridges and to convert DAS-observed strain rate data into displacement—allowing direct alignment with standard engineering evaluation metrics used in structural codes. Validation against Laser Doppler Vibrometer (LDV) measurements shows high accuracy of the DAS-estimated bridge displacements, with an Average Percentage Variation Error (APVE) below 4.98%. Additionally, vehicle speeds are estimated from DAS data to demonstrate the feasibility of real-time and anonymous traffic monitoring. The observed vehicle speed distribution closely aligns with the tiered penalty thresholds defined in traffic regulations, indicating that DAS holds strong potential for future traffic monitoring and management applications. This study offers a practical and innovative approach to dynamic bridge monitoring and displacement estimation using DAS technology.

如今，许多正在运营的桥梁都在老化，这凸显了对先进结构健康监测解决方案的需求，以确保持续的安全和性能。在本研究中，我们提出了一个集成框架，该框架利用带有自部署光纤的分布式声传感（DAS）来监测车辆引起的桥梁动态响应，并将DAS观察到的应变率数据转换为位移，从而允许与结构规范中使用的标准工程评估指标直接匹配。通过激光多普勒振动仪（LDV）的测量验证，das估计的桥梁位移精度很高，平均百分比变异误差（APVE）低于4.98%。此外，从DAS数据估计车辆速度，以证明实时和匿名交通监控的可行性。观察到的车辆速度分布与交通法规中定义的分层罚款阈值密切一致，表明DAS在未来的交通监控和管理应用中具有很大的潜力。本研究为利用DAS技术进行桥梁动态监测和位移估计提供了一种实用的创新方法。

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引用次数: 0

Plastic displacement features for classifying the inelastic deformation mode of instrumented buildings with few sensors considering sensor locations 考虑传感器位置的少传感器被测建筑物非弹性变形模式分类的塑性位移特征

IF 6.4 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2026-04-15 Epub Date: 2026-02-12 DOI: 10.1016/j.engstruct.2026.122325

Trevor Zhiqing Yeow , Koichi Kusunoki

In structural health monitoring, correct classification of a building’s inelastic deformation mode (i.e., total-yield or soft-story) is needed for accurate safety evaluations. However, sensors are usually not placed on all floors in most applications, making inelastic deformation mode classification difficult. In this study, features based on plastic displacements and sensor location are proposed for training and evaluating inelastic deformation mode classification models. The importance of the newly proposed features was compared against other features proposed in literature based on peak floor acceleration and velocity response, cumulative absolute velocity and jerk. A large building response database was created from numerical simulations of a wide range of reinforced concrete frame structures exhibiting different inelastic deformation modes for evaluating feature importance. It was found that the newly proposed features ranked highly when applying the Minimum Redundancy Maximum Relevancy algorithm to the response database compared to past features. Furthermore, a k-Nearest Neighbor classification model trained using a feature set containing the proposed features and building-level ductility response resulted in a more accurate model compared to only using existing features (misclassification rate of 10 % versus 29 %). These results demonstrate the suitability of the proposed features for training and evaluating building inelastic deformation mode classification models.

在结构健康监测中，需要对建筑物的非弹性变形模式（即全屈服或软层）进行正确的分类，以便进行准确的安全评价。然而，在大多数应用中，传感器通常不会放置在所有地板上，这使得非弹性变形模式分类变得困难。在本研究中，提出了基于塑性位移和传感器位置的特征来训练和评估非弹性变形模式分类模型。将新提出的特征的重要性与文献中提出的基于峰值地板加速度和速度响应、累积绝对速度和加速度的其他特征进行比较。通过对具有不同非弹性变形模式的各种钢筋混凝土框架结构的数值模拟，建立了一个大型建筑响应数据库，以评估特征的重要性。将最小冗余最大关联算法应用于响应数据库时，发现新提出的特征与过去的特征相比排名较高。此外，与仅使用现有特征相比，使用包含所提出特征和建筑物级延性响应的特征集训练的k-最近邻分类模型产生了更准确的模型（误分类率为10 %对29 %）。这些结果证明了所提出的特征对于训练和评估建筑物非弹性变形模式分类模型的适用性。

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引用次数: 0

Effect of confinement on the rocking response of prestressed concrete tower segments under combined compression and bending loads 压弯联合荷载下约束对预应力混凝土塔段晃动响应的影响

IF 6.4 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2026-04-15 Epub Date: 2026-02-11 DOI: 10.1016/j.engstruct.2026.122343

Shangcheng Chen , Sheng Xu , Yuhang Wang , Dongping Zhu , Xiaogang Huang

Research on the confinement effect of concrete in the rocking behavior of prestressed concrete tower segments remains limited. This study developed a test setup for specimens with large cross-sectional size and unbonded post-tensioned (PT) tendons. Six joint specimens were tested to investigate the effects of reinforcement ratio, axial load ratio, and confinement type on cyclic responses. Results show that weaker confinement significantly decreases the bearing capacity and ductility of gap-opening joints, when the transverse reinforcement ratio ρ_t is reduced from 1.13 % to 0.23 %, the positive peak load F_p of the specimen decreases by 27 %, and the ductility factor u falls by 54 %. Conversely, higher axial load ratios suppress joint opening but reduce deformation and energy dissipation capacities, as the axial compression ratio n increases from 0.23 to 0.46, the positive peak displacement Δ_p of the specimen decreases by 52 %, and the ductility factor u decreases by 79 %. Furthermore, a computational tool, WT Box, was developed to predict the compression–bending capacity after decompression. The predicted “yield” bending moments closely matched experimental results, with differences below 10 % for all the specimens.

关于混凝土对预应力混凝土塔段振动特性的约束作用的研究还很有限。本研究开发了一种测试装置，用于大截面尺寸和无粘结后张（PT）肌腱的试件。试验研究了配筋率、轴向载荷比和约束类型对节点循环响应的影响。结果表明：弱约束显著降低开缝节点的承载力和延性，当横向配筋率ρt从1.13 %降低到0.23 %时，试件的正峰值荷载Fp降低27 %，延性系数u降低54 %；反之，较高的轴压比抑制了节点张开，但降低了变形和耗能能力，当轴压比n从0.23增加到0.46时，试件的正峰值位移Δp减小了52 %，延性系数u减小了79 %。此外，还开发了一种计算工具WT Box来预测减压后的抗压弯曲能力。预测的“屈服”弯矩与试验结果非常吻合，所有试件的差异均在10 %以下。

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引用次数: 0

Predicting the remaining useful life of adhesively bonded composite structures using guided waves and a multi-connected approximate Bayesian model 利用导波和多连接近似贝叶斯模型预测粘接复合材料结构的剩余使用寿命

IF 6.4 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2026-04-15 Epub Date: 2026-02-02 DOI: 10.1016/j.engstruct.2026.122254

Yang Zhang , Maciej Radzieński , Jiyue Chen , Ziping Wang , Wiesław Ostachowicz

Adhesive bonding is one of the most utilised methods for combining composites. Accurate diagnosis and prognosis of the health state and remaining useful life (RUL) of the bonded area is crucial to ensuring the long-term service of structures. The absence of acceptable damage detection theories and targeted RUL prediction models has impeded the extensive application of adhesive composite structures. Guided waves and machine learning (ML) represent two of the most promising methodologies for fault detection and RUL prediction within structural health monitoring. Their integration significantly enhances the accuracy of diagnosis-prediction research. However, few focus on model optimisation and combining diagnosis and prognosis, with extensive research relying on Bayesian methods for prediction, increasing the complexity and difficulty of model training. This study proposes a diagnosis-prognosis framework that integrates convolutional neural networks and long short-term memory models, employing the dropout to approximate the Bayesian method to represent uncertainty, followed by the Monte Carlo sampling to achieve RUL prediction. The primary data source of ML is obtained by utilising an extended finite element method with user-defined subroutines to simulate crack growth. Comparative analysis of different RUL prediction models shed light on the proposed model’s advantages in computational speed and complexity while demonstrating high accuracy in predicting end of life. Limited experimental and simulation data test results indicate that the proposed model can identify faults in the bonded area, achieving nearly 16.43 % higher accuracy than Bayesian dynamic models.

粘接是复合材料最常用的结合方法之一。准确诊断和预测保税区结构的健康状态和剩余使用寿命对保证结构的长期使用至关重要。由于缺乏可接受的损伤检测理论和有针对性的损伤损伤预测模型，阻碍了粘接复合材料结构的广泛应用。导波和机器学习（ML）代表了结构健康监测中故障检测和RUL预测的两种最有前途的方法。它们的整合显著提高了诊断预测研究的准确性。然而，很少关注模型优化和诊断与预后相结合，大量研究依赖贝叶斯方法进行预测，增加了模型训练的复杂性和难度。本研究提出了一个集成卷积神经网络和长短期记忆模型的诊断-预后框架，采用dropout近似贝叶斯方法来表示不确定性，然后采用蒙特卡罗抽样来实现RUL预测。机器学习的主要数据源是利用扩展有限元法和用户自定义的子程序来模拟裂纹扩展。通过对不同RUL预测模型的对比分析，揭示了该模型在计算速度和复杂性方面的优势，同时显示了预测寿命结束的准确性。有限的实验和仿真数据测试结果表明，该模型能较好地识别保税区的故障，比贝叶斯动态模型的准确率提高了近16.43 %。

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引用次数: 0

Fire performance of bonded anchors in cracked concrete: Experimental and numerical investigation 裂隙混凝土中粘结锚杆的防火性能：试验与数值研究

IF 6.4 1区工程技术 Q1 ENGINEERING, CIVIL

Engineering Structures

Pub Date : 2026-04-15 Epub Date: 2026-02-10 DOI: 10.1016/j.engstruct.2026.122287

Omar Al-Mansouri , Fatima Ben Mouhou , Romain Mège , Nicolas Pinoteau , Roberto Piccinin , Peter Schillinger , Philipp Strater , Sébastien Rémond

Post-installed bonded anchors are widely used in steel-to-concrete connections where high load capacity and flexibility in anchor positioning are required. Despite improvements in polymer-based adhesives, elevated temperatures near or above the glass transition temperature significantly reduce bond resistance. The fire performance of bonded anchors and post-installed reinforcement is assessed in Europe according to EAD 330499–02–0601 and EAD 330087–02–0601, while EOTA TR 082 complements EN 1992–4 for fire design. This paper presents an experimental and numerical investigation on two bonded anchor products to provide background for current European fire-design provisions. Confined pull-out tests were performed in cracked (0.3 mm) and uncracked concrete at ambient temperature, followed by electrically heated tests to characterize the combined thermal and mechanical effects of cracking along the embedment depth. Additional furnace tests following the ISO 834–1 fire curve were conducted. Results were compared with design calculations based on the Resistance Integration Method to evaluate conservatism. The findings clarify the origin and justification of the fire design rules applied to bonded anchors in Europe.

后贴式锚杆广泛应用于钢-混凝土连接中，对锚杆定位的灵活性和承载能力要求较高。尽管聚合物基粘合剂有所改进，但接近或高于玻璃化转变温度的温度升高会显著降低粘合阻力。欧洲根据EAD 330499-02-0601和EAD 330087-02-0601评估粘结锚和后安装钢筋的防火性能，而EOTA TR 082补充了EN 1992-4的防火设计。本文对两种粘结锚固产品进行了试验和数值研究，为当前欧洲防火设计规定提供了背景。在环境温度下，在开裂（0.3 mm）和未开裂的混凝土中进行封闭拉出试验，然后进行电加热试验，以表征裂缝沿嵌入深度的热和力学综合效应。根据ISO 834-1火焰曲线进行了额外的炉膛测试。将结果与基于阻力积分法的设计计算结果进行比较，评价稳健性。研究结果澄清了适用于欧洲粘结锚的防火设计规则的起源和理由。

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引用次数: 0