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近场速度脉冲场地响应等效线性分析的适用条件

DOI: 10.3969/j.issn.1006-7043.201406079

Keywords: 等效线性化, 单向速度大脉冲, 双向速度大脉冲, 永久位移, 适用条件, 场地响应

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Abstract:

为了探讨近场强地震动中产生较大永久位移的“单向”速度大脉冲和近似不产生永久位移的“双向”速度大脉冲是否可用等效线性化方法分析处理,选取具有典型特性的地震动作为输入,通过“方法自检验”和“前人成果定性比较”等手段,分析了近场速度脉冲场地响应采用等效线性方法进行分析的适用条件。计算结果表明:对于“弱”和“中等”强度的近场“双向”速度脉冲型地震动作用,可以采用等效线性化方法进行分析。这种做法是合理的、有效的。但是,对于近场“单向”速度大脉冲型地震动作用,不适宜采用等效线性化方法进行分析,计算结果将会产生很大误差,尤其是不能反映场地永久位移和永久塑性变形特征。

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