International Journal of Impact Engineering最新文献_第8页

Damage evolution mechanism in concrete components under contact explosion: A coupled macro-meso perspective 混凝土构件接触爆炸损伤演化机制：宏细观耦合视角

IF 5.1 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Impact Engineering

Pub Date : 2025-11-05 DOI: 10.1016/j.ijimpeng.2025.105577

Yi Xiao , Weiqing Zhu , Tangjie Wang , Timon Rabczuk

This study develops a novel coupled macro‑meso analytical framework that couples structural response with localized mesoscopic damage evolution, providing a unified approach to investigate the multiscale damage evolution mechanism within concrete components during contact explosion. Within this framework, the propagation of blast stress waves and the resulting internal stress distributions are analyzed at the macro scale; the transitions of local stress states and corresponding meso‑scale damage mechanisms are examined at the meso‑scale. The effects of aggregate density, shape, and distribution on the local damage characteristics of concrete are further examined. Results show that the stress gradient of concrete near the blast center and free surface is steep along the incident direction and shallow laterally, gradually decreasing towards the interior of the component. Depending on the stress state, five typical local failure modes of concrete are identified: progressive crushing, overall collapse, crack-induced damage, internal spalling, and surface spalling. Aggregate characteristics affect concrete damage differently under various damage modes, showing a significant influence in the crack-induced and spalling zones but only a limited effect in the progressive-crushing zone. This work provides a comprehensive multiscale understanding of internal damage mechanisms of concrete components under contact explosion, thereby contributing to the rational design of blast-resistant structures.

本研究开发了一种新的宏细观耦合分析框架，将结构响应与局部细观损伤演化耦合在一起，为研究接触爆炸过程中混凝土构件内部多尺度损伤演化机制提供了统一的方法。在此框架下，在宏观尺度上分析了爆炸应力波的传播和由此产生的内应力分布；在细观尺度上考察了局部应力状态的转变和相应的细观尺度损伤机制。进一步研究了骨料密度、形状和分布对混凝土局部损伤特性的影响。结果表明：爆炸中心和自由面附近混凝土的应力梯度沿入射方向陡峭，侧向较浅，向构件内部逐渐减小；根据不同的应力状态，确定了五种典型的混凝土局部破坏模式：渐进破碎、整体破坏、裂缝损伤、内部剥落和表面剥落。不同损伤模式下骨料特性对混凝土损伤的影响不同，在裂缝诱导区和剥落区影响显著，在渐进破碎区影响有限。本研究为混凝土构件在接触爆炸作用下的内部损伤机制提供了一个全面的多尺度认识，从而有助于合理设计抗爆结构。

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引用次数: 0

Study on the dynamic mechanical properties of PBX under multiple impact environments 多冲击环境下PBX动态力学性能研究

IF 5.1 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Impact Engineering

Pub Date : 2025-11-05 DOI: 10.1016/j.ijimpeng.2025.105579

Xue Zhang , Wenzheng Xu , Yulong Yang , Xiaolong Chang , Ningxin Ma , Shuying Lan , Yuhan Cui , Yunlong Xia , Sinuo Xin , Congcong Zhang , Boyang Zhang

To simulate the actual deceleration environment of the projectile-borne charge during the penetration of multi-layered hard targets, a multi-impact test method was designed based on the light gas gun test device for the penetration of concrete by projectile-borne charge. By adjusting the length of the steel pillar behind the charge, different deceleration environments for PBX were achieved. This allows the axial compression and density change rate obtained from the light gas gun tests to be equivalent to the artillery penetration test results. Building on this, multiple impact tests were conducted under different deceleration levels. Using a viscoelastic-plastic constitutive model and the LS-DYNA finite element software, multi-impact tests under different deceleration conditions were simulated. Moreover, the simulation results are consistent with the light gas gun test results. Stress curves, strain curves, and the density variation curve of the charge during each impact, which could not be measured in the experiments, were obtained. Through analysis, the dynamic response patterns of the charge under multiple impacts in different deceleration environments were obtained. The research results are of great significance for understanding the safety and structural stability of PBX under multi-impact environments.

为了模拟弹载装药侵彻多层硬目标时的实际减速环境，基于轻气枪弹载装药侵彻混凝土试验装置，设计了一种多冲击试验方法。通过调整炉膛后钢柱的长度，实现了PBX不同的减速环境。这使得从轻气枪试验中获得的轴向压缩和密度变化率与火炮侵彻试验结果相当。在此基础上，进行了不同减速水平下的多次冲击试验。采用粘弹塑性本构模型和LS-DYNA有限元软件，模拟了不同减速条件下的多次冲击试验。仿真结果与轻气枪试验结果吻合较好。得到了每次冲击过程中电荷的应力曲线、应变曲线和密度变化曲线，这些都是实验中无法测量的。通过分析，得到了不同减速环境下多种冲击作用下装药的动态响应规律。研究结果对了解PBX在多冲击环境下的安全性和结构稳定性具有重要意义。

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引用次数: 0

Analysis model of double-layer targets of projectile penetration into concrete/rock considering interface effects 考虑界面效应的弹丸侵彻混凝土/岩石双层靶分析模型

IF 5.1 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Impact Engineering

Pub Date : 2025-11-03 DOI: 10.1016/j.ijimpeng.2025.105567

Shushu Zhao, Jianguo Ning, Xiangzhao Xu

In this study, projectile penetration into a concrete/rock double-layer target is studied experimentally. The influence of interfacial reflected and transmitted waves on the perforation performance of double-layer targets is studied using the one-dimensional stress wave propagation theory. The perforation mechanism of double-layer targets is obtained by combining the principles of energy conservation and minimum potential energy. Based on these, a theoretical model is established to analyze the penetration behavior of the double-layered target subjected to rigid projectile loading. The established model is verified using the experimental data obtained from this study and other published literature. The results show that the prediction results of the present model are consistent with the experimental data at different initial penetration velocities. A comparative analysis of the present model with several previous penetration prediction models reveals its substantial advantages in terms of accuracy and applicability. The model can effectively predict the penetration performance of concrete/rock double-layer targets under different penetration velocities.

本文研究了弹丸侵彻混凝土/岩石双层目标的实验问题。利用一维应力波传播理论，研究了界面反射波和透射波对双层靶射孔性能的影响。结合能量守恒原理和最小势能原理，得到了双层靶的穿孔机理。在此基础上，建立了双层目标在刚性弹载作用下侵彻行为的理论模型。利用本研究的实验数据和其他已发表的文献对所建立的模型进行了验证。结果表明，在不同初始侵彻速度下，模型的预测结果与实验数据吻合较好。通过与以往几种侵彻预测模型的对比分析，揭示了该模型在准确性和适用性方面的巨大优势。该模型能有效预测不同侵彻速度下混凝土/岩石双层目标的侵彻性能。

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引用次数: 0

Coupled effects of thermal and micro-damage softening on the initiation of adiabatic shear instability in strongly textured pure tungsten 热与微损伤软化对强织构纯钨绝热剪切失稳起始的耦合影响

IF 5.1 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Impact Engineering

Pub Date : 2025-11-03 DOI: 10.1016/j.ijimpeng.2025.105568

Jianguo Li , Xiukai Kan , Longkang Li , Haosen Chen , Tao Suo

Previous research has shown that introducing appropriate strong texture components into low-ductility pure tungsten (W) can more readily induce adiabatic shear localization. However, identifying the key factors that drive plastic instability in strongly textured pure W remains a significant challenge, particularly in accurately accounting for the thermal softening effect on the evolution of dynamic instability. In this work, we first investigated the mechanical response, temperature and strain fields evolution of coarse-grained W and as-rolled W under dynamic compression using a “force-heat-deformation” dynamic in-situ synchronous testing system based on split Hopkinson pressure bar. The Taylor-Quinney coefficient of pure W was determined to be about 0.55 at large strains, and the detected temperature rise within the localized shear zone was very limited even after instability occurred. Hence, thermal softening was not the sole factor triggering the adiabatic shear bands (ASBs). Subsequently, meticulous microscopic observations revealed the appearance of interlaminar microcracks along the shear directions prior to dynamic instability. To consider the microscale damage effect on the dynamic instability evolution, we incorporated a damage evolution equation into the crystal plasticity finite element model (CPFEM) to more accurately describe the dynamic instability responses of this strongly textured pure W. By comparing the experimental and CPFEM simulation results, their high consistency indicated that incorporating the damage evolution model significantly promoted shear concentration and the subsequent instability. The coupled effects of thermal softening and micro-damage evolution are the critical factors triggering plastic instability in strongly textured pure W. This work provides a profound understanding of the micro-damage softening effect on the evolution of dynamic instability behavior in metallic materials.

已有研究表明，在低延性纯钨(W)中引入适当的强织构成分更容易引起绝热剪切局部化。然而，确定驱动强织构纯W塑性不稳定的关键因素仍然是一个重大挑战，特别是在准确计算热软化对动态不稳定演变的影响方面。本文首先利用基于Hopkinson压杆的“力-热-变形”动态原位同步测试系统，研究了粗晶钨和轧制态钨在动态压缩下的力学响应、温度场和应变场演化。在大应变下，纯W的Taylor-Quinney系数约为0.55，即使发生失稳，在局部剪切区域内检测到的温升也非常有限。因此，热软化并不是引发绝热剪切带（asb）的唯一因素。随后，细致的显微观察显示，在动力失稳之前，沿剪切方向出现了层间微裂纹。为了考虑微尺度损伤对动态失稳演化的影响，我们在晶体塑性有限元模型（CPFEM）中引入了损伤演化方程，以更准确地描述这种强织构纯w的动态失稳响应。通过对比实验和CPFEM模拟结果，两者的高一致性表明，引入损伤演化模型显著促进了剪切集中和随后的失稳。热软化和微损伤演化的耦合效应是引发强织构纯w塑性失稳的关键因素。本研究为深入理解微损伤软化对金属材料动力失稳行为演化的影响提供了依据。

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引用次数: 0

Tailoring ideal stress plateau for impact-resistant lattices with a bionic hybrid hierarchical strategy 用仿生混合分层策略为抗冲击晶格定制理想应力平台

IF 5.1 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Impact Engineering

Pub Date : 2025-10-30 DOI: 10.1016/j.ijimpeng.2025.105566

Kuijian Yang , Shuo Huang , Weihua Bi , Liang Zhang , Jing Cheng , Qinghua Qin , Yuli Chen

It is a long-standing challenge to harness ideal stress plateau with unobvious peak, large capacity and high steadiness when designing impact-resistant structures. To achieve this goal, bionic hybrid hierarchical lattices (BHHL) inspired by muscles and shells of the lobsters are proposed, which integrates high-capacity stretch-dominated and high-stability bending-dominated units. Prescribable deformation pattern and ideal stress plateau are observed from experiments and simulations. Energy absorption efficiency, force efficiency and force steadiness of BHHL respectively reach 54.8 %, 92.9 % and 84.6 % under quasi-static loads, which averagely outperforms five classical structures of same mass by 12.7 %, 32.8 % and 66.7 %. Notably, these superiorities almost remain unaffected in strong impact experiments with energies of 13.1–25.6 kJ. A plastic hinge model with relative error less than 3.8 % is developed to estimate the plateau stress, and can be used to tailor ideal target stress plateau under both quasi-static and dynamic loads. Due to integration of stretch- and bending-dominated mechanisms, specific energy absorption of BHHL is inferior to stretch-dominated but obviously superior to bending-dominated structures of same mass, whilst its other indicators are notably higher than all eight comparative models. This works provides a new pathway to quickly tailor ideal stress plateau for impact-resistant lattices based on metallic constituent material and novel structural design.

在设计抗冲击结构时，如何利用峰值不明显、承载力大、稳定性高的理想应力平台是一个长期存在的挑战。为了实现这一目标，提出了以龙虾肌肉和外壳为灵感的仿生混合分层晶格（BHHL），该结构集成了高容量拉伸主导单元和高稳定性弯曲主导单元。通过实验和模拟得到了规定的变形模式和理想的应力平台。准静态载荷作用下，BHHL的吸能效率、力效率和力稳定性分别达到54.8%、92.9%和84.6%，平均比5种同质量经典结构分别高出12.7%、32.8%和66.7%。值得注意的是，在能量为13.1-25.6 kJ的强冲击实验中，这些优势几乎不受影响。建立了相对误差小于3.8%的塑性铰模型来估计平台应力，可用于拟静态和动态载荷下的理想目标应力平台。由于拉伸和弯曲主导机制的整合，BHHL的比能吸收低于拉伸主导结构，但明显优于相同质量的弯曲主导结构，其他指标均显著高于8种比较模型。这项工作为快速定制基于金属成分材料和新型结构设计的抗冲击晶格理想应力平台提供了新的途径。

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引用次数: 0

Revealing damage characteristics and short circuit mode of lithium-ion batteries under high-speed steel ball impact 揭示高速钢球冲击下锂离子电池的损伤特征及短路模式

IF 5.1 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Impact Engineering

Pub Date : 2025-10-23 DOI: 10.1016/j.ijimpeng.2025.105565

Lubing Wang , Tianhong Yao , Jiani Li , Yuxin Jiang , Xiang Gao

The safety of lithium-ion batteries in military applications is critically limited by their vulnerability under ballistic impact. This study investigates the mechanical and electrochemical failure of commercial 12.5 Ah pouch cells subjected to impact by steel ball (6.61 g, 12 mm diameter) at velocities ranging from 80 to 312 m/s through a combination of experimental and computational approaches. Four distinct damage modes are identified: Surface denting without penetration under low-velocity impacts (80–100 m/s); Projectile embedded into the battery induced by medium-low velocity impacts (100–133 m/s); Complete penetration caused by medium-high velocity impacts (133–200 m/s); Severe structural damage with material jet stemming from high-velocity impacts (200–312 m/s). Impacts above 133 m/s cause immediate voltage collapse to 0 V, signaling catastrophic short circuits. We develop a computational model that accounts the anisotropic in-plane/out-of-plane mechanical behavior of electrodes and separators, as well as the strain-rate sensitivity of all components. The model accurately predicts residual velocities after penetration and revealed the failure mechanism. We speculate that whereas the penetration channel itself does not directly cause hard short circuits, the anisotropic nature of the separator leads to crack propagation along its preferential orientation. These cracks grow longer and wider than those in the electrodes. These extended separator cracks ultimately create sufficient contact area between the cathode and anode to initiate hard short circuits.

锂离子电池在军事应用中的安全性受到其在弹道冲击下的脆弱性的严重限制。本研究通过实验和计算相结合的方法，研究了商用12.5 Ah袋状电池在速度为80至312 m/s的钢球（6.61 g，直径12 mm）的冲击下的机械和电化学失效。确定了四种不同的损伤模式：低速冲击（80-100 m/s）下表面凹痕无穿透；中低速冲击（100-133 m/s）诱导弹丸嵌入电池；中高速撞击（133 - 200m /s）造成的完全侵彻；高速撞击（200-312 m/s）产生的材料射流对结构造成严重损伤。超过133米/秒的撞击会立即导致电压骤降至0 V，这是灾难性短路的信号。我们开发了一个计算模型，该模型考虑了电极和分离器的面内/面外力学行为的各向异性，以及所有组件的应变率灵敏度。该模型准确地预测了侵彻后的残余速度，揭示了破坏机理。我们推测，虽然渗透通道本身不会直接导致硬短路，但隔膜的各向异性导致裂纹沿着其优先方向扩展。这些裂缝比电极上的裂缝长得更长更宽。这些扩展的隔板裂缝最终在阴极和阳极之间产生足够的接触面积，从而引发硬短路。

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引用次数: 0

Corrigendum to “Size matters: Impact energy absorption across five decades of length scale” [International Journal of Impact Engineering, Vol. 207 (2026) 105478/ ISSN 0734-743X] “尺寸问题：跨越50年长度尺度的冲击能量吸收”的勘误[国际冲击工程杂志，Vol. 207 (2026) 105478/ ISSN 0734-743X]

IF 5.1 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Impact Engineering

Pub Date : 2025-10-22 DOI: 10.1016/j.ijimpeng.2025.105558

Jacob A. Rogers , Kailu Xiao , Paul T. Mead , Charles U. Pittman , Edwin L. Thomas , Justin W. Wilkerson , Thomas E. Lacy

引用次数: 0

Damage and vibration evaluation of nuclear power plant under pipe whipping-an experimental and numerical simulation study 核电站管道抽抽损伤与振动评估——实验与数值模拟研究

IF 5.1 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Impact Engineering

Pub Date : 2025-10-22 DOI: 10.1016/j.ijimpeng.2025.105564

J Y Jia , L K Yang , L T Chen , H Wu , L L Ma

Nuclear energy is favored by governments both internationally and domestically due to its less carbon emission and stable energy output. The importance of the nuclear safety cannot be overemphasized due to the serious consequence of the possible nuclear leakage. At present, the damage and vibration evaluation of nuclear power plant (NPP) under pipe whipping was carried out. A total of seven shots of 1/4-scaled impact test were carried out by the large-caliber compressed air cannon system at Structural Impact Resistance Laboratory in Tongji University. The main pipe whipping induced damage modes of the NPP wall on the front/rear surfaces were revealed including cratering/no damage, cratering/scabbing without rebars exposed, cratering/scabbing with rebars exposed, and cratering/through-thickness crushing with rebars exposed. Subsequently, by comparing with the experimental pipe-wall interaction process, and the damage mode and range of the wall, the adopted numerical simulation method was well validated and utilized for analysis of dynamic behavior of prototype NPP under steam pipe whipping. It was derived that: (i) Compared with the coupled method, though the decoupled method yields identical pipe whipping force, it still underestimates the localized damage degree of NPP because the area loaded by the whipping force-time histories is constant, which is different from the actual condition. (ii) The energy mechanism of pipe whipping NPP wall is that the pipe dissipates the majority of the whipping energy through its large plastic deformation. Decreasing the gap between the pipe and the NPP wall and rationally arranging the pipe whip restraint can significantly reduce the pipe whipping force by up to 37 %, thus minimizing the damage degree of the NPP. (iii) Under steam pipe whipping impact, the NPP experiences only minor damage, and the its integrity can be guaranteed. However, the peak resultant acceleration response in the whipped rooms is up to 70 g, and it may have a substantial influence on the vibration sensitive equipment. It is recommended that this equipment should be arranged far from these rooms, e.g., adjacent rooms where the peak resultant acceleration response is smaller than 12 g.

核能因其低碳排放和稳定的能源输出而受到国内外政府的青睐。由于核泄漏可能造成的严重后果，核安全的重要性再怎么强调也不为过。目前，对核电站进行了管道抽抽工况下的损伤与振动评估。在同济大学结构抗冲击实验室，采用大口径压缩空气炮系统进行了7次1/4比例冲击试验。结果表明，核电机组前后表面的主要管鞭损伤模式包括：破洞/无破洞、无钢筋暴露的破洞/结痂、有钢筋暴露的破洞/结痂、有钢筋暴露的破洞/透厚破洞。随后，通过与实验管壁相互作用过程、管壁损伤模式和范围的对比，验证了所采用的数值模拟方法的有效性，并将其应用于原型核电厂在蒸汽管道鞭挞作用下的动力特性分析。结果表明：(1)与耦合方法相比，解耦方法虽然得到的鞭笞力相同，但由于鞭笞力-时间历史加载的面积是恒定的，与实际情况不同，仍然低估了NPP的局部损伤程度。（ii）管道鞭挞NPP壁的能量机制是管道通过其较大的塑性变形耗散了大部分鞭挞能。减小管道与NPP管壁之间的间隙，合理布置管道鞭子约束，可以显著降低管道鞭子力，最大可降低37%，从而使NPP的破坏程度降到最低。(3)在蒸汽管鞭挞冲击下，核电站的损伤较小，完整性得到保证。然而，在鞭打室中产生的峰值加速度响应高达70g，并且它可能对振动敏感设备产生重大影响。建议将此设备布置在远离这些房间的地方，例如，相邻的房间，其峰值加速度响应小于12g。

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引用次数: 0

Dynamic model for RC members impacted by metal/PWG composite impact module 金属/PWG复合材料冲击模组冲击RC构件的动力学模型

IF 5.1 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Impact Engineering

Pub Date : 2025-10-14 DOI: 10.1016/j.ijimpeng.2025.105561

Guanxia Yang , Haijun Wu , Heng Dong , Ning Mo , Fenglei Huang

The blast simulator based on high-speed impact has the advantages of low cost, strong repeatability and easy data acquisition, and is expected to become a promising supplement to traditional blast tests. However, there is a lack of theoretical model describing the dynamic response of impact system to guide the setting of loading conditions and the evaluation of loading effects. This study focuses on the impact system of a metal/PWG composite impact module (MPCIM) impacting reinforced concrete (RC) beam, aims to develop an accurate dynamic model based on equivalent degree of freedom model for rapid prediction of the impact load and structural response of RC beam. Firstly, regardless of the influence of the impacted structure, the quasi-static and dynamic compression numerical simulations for PWG with different dimensions were carried out. The nonlinear dynamic response model of PWG considering the dimension and impact velocity of MPCIM was developed by combining machine learning methods. Then, based on Euler-Bernoulli beam theory and the impact process of MPCIM and RC beam, a resistance function of RC beam incorporating the dimension of MPCIM was derived. Finally, a novel dynamic model of the impact system that considers the characteristics of the RC beam, the MPCIM dimension, and the dynamic response of PWG was established and verified by numerical simulation results. The results show that the model can accurately predict the impact load and structural response of RC beam impacted by MPCIM.

基于高速冲击的爆炸模拟器具有成本低、可重复性强、数据采集方便等优点，有望成为传统爆炸试验的有益补充。然而，目前还缺乏描述冲击系统动态响应的理论模型来指导加载条件的设置和加载效果的评价。本研究以金属/PWG复合冲击模块（MPCIM）冲击钢筋混凝土（RC）梁的冲击系统为研究对象，旨在建立基于等效自由度模型的精确动力模型，快速预测RC梁的冲击载荷和结构响应。首先，在不考虑冲击结构影响的情况下，对不同尺寸的PWG进行了准静态和动态压缩数值模拟。结合机器学习方法，建立了考虑MPCIM尺寸和冲击速度的PWG非线性动态响应模型。然后，基于欧拉-伯努利梁理论和MPCIM与RC梁的碰撞过程，推导了考虑MPCIM尺寸的RC梁阻力函数。最后，建立了考虑RC梁特性、MPCIM尺寸和PWG动力响应的冲击系统动力学模型，并通过数值模拟结果进行了验证。结果表明，该模型能较准确地预测受MPCIM冲击的RC梁的冲击荷载和结构响应。

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引用次数: 0

Impact and residual performance of hybrid steel-BFRP reinforced concrete beams: experimental and numerical study 混合钢- bfrp增强混凝土梁的冲击和残余性能：试验和数值研究

IF 5.1 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Impact Engineering

Pub Date : 2025-10-14 DOI: 10.1016/j.ijimpeng.2025.105559

Renbo Zhang, Xinchen Li, Liu Jin, Xiuli Du

Hybrid reinforced concrete (hybrid-RC) structures use fiber-reinforced polymer (FRP) and steel bars to optimize the durability of steel-reinforced concrete (steel-RC) structures and the safety performance of FRP-reinforced concrete (FRP-RC) structures. However, current research on the impact damage mechanism and residual performance of hybrid-RC beams is insufficient, and quantitative methods for assessing their damage extent after impact are lacking. To investigate the impact resistance and post-impact residual performance of hybrid-RC beams, nine concrete beams with three reinforcement types, i.e., pure steel bars, pure basalt FRP (BFRP) bars, and hybrid reinforcement, were tested under drop hammer impact and residual static loading, and numerically analyzed the effects of key parameters on residual performance. The experimental results indicate that the damage and deformation of hybrid-RC beams lie between those of steel-RC beams and BFRP-RC beams, exhibiting excellent impact resistance. Increasing reinforcement ratios significantly enhances beam impact resistance, but higher reinforcement ratios in BFRP-RC beams exacerbate brittle failure, abruptly reducing residual capacity and energy dissipation. The numerical results reveal that a rational increase in reinforcement ratio reduces capacity degradation. Also, increasing reinforcement area ratio exacerbates capacity degradation. Hybrid-RC beams effectively mitigate shear failure risks in BFRP-RC beams while optimizing structural performance at high reinforcement ratios. Finally, based on the relationship between capacity degradation and residual deflection, a rapid and quantitative damage assessment method suitable for post-impact hybrid-RC beams was proposed.

混合钢筋混凝土（Hybrid - rc）结构采用纤维增强聚合物（FRP）和钢筋来优化钢-钢筋混凝土（钢- rc）结构的耐久性和FRP-钢筋混凝土（FRP- rc）结构的安全性能。然而，目前对混合混凝土梁的冲击损伤机理和残余性能的研究不足，也缺乏评估其冲击损伤程度的定量方法。为研究混合钢筋混凝土梁的抗冲击性能和冲击后残余性能，采用纯钢筋、纯玄武岩FRP （BFRP）钢筋和混合钢筋3种配筋方式对9根混凝土梁进行了落锤冲击和残余静载试验，并数值分析了关键参数对残余性能的影响。试验结果表明，混合混凝土梁的损伤和变形介于钢- rc梁和BFRP-RC梁之间，具有良好的抗冲击性能。增加配筋率可显著提高梁的抗冲击能力，但高配筋率会加剧BFRP-RC梁的脆性破坏，使剩余承载力和耗能骤然降低。数值结果表明，合理增加配筋率可以减小承载力退化。钢筋面积比的增加加剧了承载力的退化。混合混凝土梁有效地降低了BFRP-RC梁的剪切破坏风险，同时优化了高配筋率下的结构性能。最后，基于承载力退化与残余挠度的关系，提出了一种适用于碰撞后混合rc梁的快速、定量损伤评估方法。

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引用次数: 0