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浅硬场地剪切波速变异性对结构地震输入的影响

DOI: 10.13197/j.eeev.2015.01.20.chenzs.003, PP. 20-27

Keywords: 剪切波速,标准差,浅硬场地,结构动力响应,周期

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Abstract:

场地对地面结构地震动力的输入分析有决定性影响。本文用Shake2000程序计算并讨论了浅硬场地多工况下剪切波速变化对不同周期结构动力响应的影响,主要结论如下浅硬场地剪切波速测试标准差对地表加速度反应谱的影响很大,影响程度与输入地震动的强度、频率和剪切波速有关;剪切波速测试标准差对地表加速度反应谱的影响在大多数情况下不可忽略;对于不同周期的结构,剪切波速变化对短周期和1s周期的影响程度与地表加速度反应谱峰值略有不同;场地剪切波速减小对反应谱的影响明显大于波速增大时的影响;浅硬场地波速标准差对短周期的影响基本不可忽略,对1s周期的影响则可以忽略;随地震动强度增加,剪切波速的减小对反应谱短周期的影响程度加大。

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