钢筋混凝土板上高对比度矿物粘结层对均匀冲击波的保护潜力

IF 5.1 2区 工程技术 Q1 ENGINEERING, MECHANICAL International Journal of Impact Engineering Pub Date : 2024-10-22 DOI:10.1016/j.ijimpeng.2024.105149
Lena Leicht , Matteo Colombo , Paolo Martinelli , Cesare Signorini , Viktor Mechtcherine , Marco di Prisco , Silke Scheerer , Manfred Curbach , Birgit Beckmann
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摘要

本研究比较了钢筋混凝土 (RC) 板的抗爆性能,在面向冲击的一侧进行了加固和未进行加固。加固策略采用了两层相互刚度偏移较大的薄层材料,即高对比层。第一层是由超轻混凝土制成的低强度、低模量阻尼层,然后是第二层高弹性纤维增强混凝土。所研究的普通 RC 板厚度为 40 毫米或 100 毫米。分层试样由 40 毫米厚的 RC 板和 40 毫米的阻尼层以及 20 毫米的 SHLC3 覆盖层组成。这种结构可将其行为与未加固试样(40 毫米厚的普通 RC 板)和具有相似特征频率的试样(100 毫米厚的普通 RC 板)进行比较。采用的冲击管使试样承受两个快速上升的等压:低压波达到约 0.4 兆帕,高压波达到约 1.2 兆帕的峰值。研究通过加速度、速度和变形来评估试样的响应。此外,它还通过分析裂纹模式、超声波脉冲速度 (UPV) 测量和阻尼分析来评估损坏情况。总体而言,分层试样的性能几乎与 100 毫米厚的试样相当,尽管质量和弯曲刚度较低,但却显示出相似的变形和速度。与 40 毫米厚的板材不同,高压冲击波几乎不会损坏分层试样。
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Protective potential of high-contrast mineral-bonded layers on reinforced concrete slabs subjected to uniform shock waves
This study compares the blast performance of reinforced concrete (RC) slabs with and without strengthening on the impact-facing side. The strengthening strategy employed the application of two thin layers of materials with a high mutual stiffness offset, i.e., high-contrast layers. The first is a low-strength, low-modulus damping layer made of infra-lightweight concrete, followed by a second layer of high-ductility fiber-reinforced concrete. The plain RC slabs under investigation vary in thickness of either 40 mm or 100 mm. The layered specimens consist of a 40 mm thick RC slab strengthened with a 40 mm damping layer and a 20 mm cover SHLC3 layer. This configuration enables a comparison of its behavior with the unstrengthened specimen (a plain 40 mm thick RC slab) and a specimen with a similar eigenfrequency (the plain 100 mm thick RC slab). The employed shock tube subjects the specimens to two rapidly rising areal pressures: a low-pressure wave reaching approximately 0.4 MPa and a high-pressure wave peaking at around 1.2 MPa. The study assesses the specimens’ response in terms of accelerations, velocities, and deformations. Additionally, it evaluates damage by analyzing crack patterns, Ultrasonic Pulse Velocity (UPV) measurements, and damping analysis. Overall, the layered specimens exhibited performance nearly equivalent to the 100 mm thick specimens, displaying similar deformations and velocities despite having lower mass and bending stiffness. The high-pressure shock wave hardly damaged the layered specimens, unlike the 40 mm thick slabs.
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来源期刊
International Journal of Impact Engineering
International Journal of Impact Engineering 工程技术-工程:机械
CiteScore
8.70
自引率
13.70%
发文量
241
审稿时长
52 days
期刊介绍: The International Journal of Impact Engineering, established in 1983 publishes original research findings related to the response of structures, components and materials subjected to impact, blast and high-rate loading. Areas relevant to the journal encompass the following general topics and those associated with them: -Behaviour and failure of structures and materials under impact and blast loading -Systems for protection and absorption of impact and blast loading -Terminal ballistics -Dynamic behaviour and failure of materials including plasticity and fracture -Stress waves -Structural crashworthiness -High-rate mechanical and forming processes -Impact, blast and high-rate loading/measurement techniques and their applications
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