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Seismic response and failure mechanism of underground frame structures based on dynamic centrifuge tests

机译:基于动态离心机测试的地下框架结构的地震反应与故障机制

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During the 1995 Kobe earthquake in Japan, the Daikai subway station suffered total collapse, which made the research on the seismic failure mechanism of underground frame structures become a hot topic. The author has carried out a lot of research on earthquake failure mechanism of underground frame structures based on numerical method. To validate and further study the seismic failure response and mechanism of underground frame structures, a series of comparative dynamic centrifuge tests were carried out. The research conclusions are as follows. The vertical earthquake action significantly increased the axial pressure on the columns of an underground frame structure, reducing their horizontal deformation capacity. The columns subjected to high axial compression were prone to brittle damage under a relatively strong horizontal earthquake, which led to the overall collapse of an underground frame structure. The areas near the intersection of the ceiling slab and the sidewalls were the weak part of the underground frame structure and were vulnerable to tensile cracks under earthquake. The columns' top and bottom were the fragile parts and were prone to concrete cracking or even shear failure under an earthquake. If the columns could remain intact and effectively provided vertical support under a strong earthquake, it was beneficial to reduce the risk of the overall collapse of an underground frame structure.
机译:在日本1995年神户地震中,大开地铁站遭遇全面崩溃,这使得地下框架结构的地震破坏机理的研究成为一个热门话题。笔者进行了大量的研究基于数值方法的地下框架结构的地震破坏机理。验证和进一步研究地震失败响应和地下框架结构的机构,一系列对比动态离心机进行了试验。研究结论如下。垂直地震作用显著增加了对一个地下框架结构的柱的轴向压力,从而降低它们的水平变形能力。经受高轴向压缩的柱是容易脆损相对强的水平地震,这导致了一个地下帧结构的整体崩溃下。所述天花板的交点附近和区域的侧壁是地下帧结构的薄弱部分并容易受到拉伸下地震裂缝。列的顶部和底部分别易碎部分和地震下均易发生开裂混凝土或甚至剪切破坏。如果列可以保持不变,并强烈地震作用下有效地提供垂直支撑,这是有利于降低地下框架结构的整体崩溃的风险。

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