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中文摘要：
对汶川地震后紫坪铺面板堆石坝台阵余震记录进行了分析,研究实测余震地震动频谱特性等基本特征。选择有代表性的坝址基岩台站记录到的余震地震动作为大坝地震动输入,对紫坪铺大坝进行了三维动力有限元分析,并将计算得到的坝体加速度放大倍数与不同坝高台站的监测数据进行了对比。研究结果表明：实测余震地震动加速度反应谱在短周期部分有一定波动,在周期稍长时随周期增加而衰减,符合地震动反应谱的基本特征;综合实测大坝反应、数值计算结果以及以往实测相关资料,本次紫坪铺大坝余震实测结果反映了土工构筑物反应的一般规律。
英文摘要：
The dynamic response of Zipingpu Concrete Face Rock-fill Dam（CFRD） shocked by aftershock after Wenchuan Earthquake is analyzed.The basic characteristics such as response spectrum of aftershock records are studied.Three-dimensional dynamic finite element method（FEM） is adopted to analyze Zipingpu CFRD while the representative strong motion recorded by rock stations at the dam site are used as the seismic input and then compared with the measured data recorded by stations of Zipingpu Dam.It is shown that the measured acceleration response spectrum of aftershock records in the short period partly exhibits certain fluctuation and a decreasing trend in longer period.It seems that the shape of the seismic response spectrum measured by stations of Zipingpu dam is consistent with features of the spectrum law.From the measured results and numerical results as well as previous experimental information,the measured results of the aftershocks are consistent with the general rules of structural response.
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