从理论方程上，看不出反应加速度法和反应位移法的精度会随地下结构埋深而变化，因此为确定其精度，设定不同场地条件下、不同埋深的城市轨道交通箱型地下结构为基准模型，使用反应加速度法、反应位移法、修正的反应位移法和时间历程法计算基准模型的结构内力，评价前三种方法随埋深变化的精度。结果表明：前三种方法的精度会受到场地类型、土层厚度和结构埋深的影响；若以时间历程法为基准，反应位移法的精度要低于反应加速度法和修正的反应位移法；反应加速度法和修正反应位移法的精度受埋深影响较小，反应位移法在埋深较小时精度尚可。
Abstract
Accuracy of response acceleration method(RAM) and response displacement method(RDM) does not vary with different imbedding depths of underground structures only based on theoretical equation of the above two methods. The performances of three methods, such as RAM, RDM and modified response displacement method(MRDM), were evaluated and compared with that of the dynamic time history method through a selected benchmark numerical example.The internal forces of underground structure were computed in different geological conditions and different depths. It was found thatif the time history method was selected as a benchmark, RAM, RDM and MRDM were affected by site classification, soil thickness and embedment depth, while RAM and MRDM were generally superior over RDM. It was also found that RAM and MRDM were suitable for each embedment depth and RDM was suitable for shallow underground structures.
关键词
反应加速度法 /
反应位移法 /
地下结构 /
抗震设计
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Key words
response acceleration method;response displacement method /
underground structure /
seismic design
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