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基于黏弹性解的土层地震反应分析程序LSSRLI-1 和SHAKE2000的对比

DOI: 10.13197/j.eeev.2015.03.17.lirs.003, PP. 17-27

Keywords: 地震反应分析,等效线性化,精确解,地表反应谱,土体剪应变分布

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Abstract:

地震过程中震动传播的局部场地效应通常用一维的场地反应分析方法来考虑,目前使用最多的是线性、等效线性化和非线性三类,其中国内外分别以LSSRLI-1和SHAKE2000为代表的等效线性化程序使用最为广泛。LSSRLI-1是我国地震安全评价程序,提出已有20多年,为我国的防震减灾事业做出了巨大贡献,但也在实践过程中表现出了一些缺点和不足,是否可以改进有待研究。本文以经典波动理论为基础编制了相应的土层反应分析线性计算程序,并与LSSRLI-1和SHAKE2000就硬和软两种场地上地表加速度反应谱和土体剪应变分布进行了对比分析,考虑了不同输入波以及不同震动强度对分析结果的影响,也讨论了土体剪应变计算偏差对地表反应谱的影响。结果表明硬和软场地上SHAKE2000计算出地表加速度反应谱和土体剪应变分布均符合较好;硬和软场地上传递函数计算中LSSRLI-1、SHAKE2000和精确解三者一致;硬场地上LSSRLI-1计算所得土体剪应变分布同SHAKE2000和精确解相比偏差很小且对反应谱的影响可以忽略;某些情况下,软场地上LSSRLI-1计算出的土体剪应变分布同SHAKE2000和精确解相比明显偏大,该偏差会导致地表响应显著偏小,说明LSSRLI-1用于软场地地震反应分析时其剪应变求解方法有待改进。

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