多层地铁车站结构性能试验研究

为掌握地震作用下多层地铁车站结构从材料、局部构件到整体结构的非线性破坏状态,以上海市某多层地铁车站工程为背景,开展了1:10大型静力推覆(Pushover)试验。结合地下结构地震响应特征,采用倒三角分布的侧向位移推覆加载模式,并由多个作动器实现多点协调加载。分析研究了多层地铁车站结构的裂缝开展过程、结构及构件破坏形态、塑性铰开展顺序、Pushover曲线,并总结了结构整体和中柱的破坏模式,给出车站结构重要性能点数值,综合评价了多层地铁车站结构的抗震性能及特点,可为基于性能的抗震设计提供依据。

Performance Experiment of a Multi-story Subway Station

In order to study the non-linear failure state of materials, local components and integral structure of multi-story subway station under earthquake action, a 1:10 large-scale pushover test was carried out in the background of a multi-story subway station project in Shanghai. According to the seismic response characteristics of underground structures, loading mode was in the form of inverted triangular displacement carried out by means of multi-point coordinated loading by three actuators. Development process of cracks, plastic hinges formation sequence and pushover curve were studied. Failure patterns and modes of the whole structure and central columns were contrasted. Critical performance data points of the structure was given. On account of the pushover test results, the seismic performance of deep metro station structure was also comprehensively analyzed, which can provide reference for designs of similar structure based on seismic performance.