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西安城墙永宁门箭楼振动台试验研究

DOI: 10.13197/j.eeev.2014.05.140.gaodf.018, PP. 140-149

Keywords: 古建筑,多层木结构,振动台试验,抗震性能,耗能

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Abstract:

为了研究明清时期厅堂式木结构的抗震性能,以西安城墙永宁门箭楼为研究对象,按照清工部《工程做法则例》的规制制作了缩尺比为16的局部结构模型,并对其进行了地震模拟振动台试验,分析了模型结构在不同强度模拟地震激励下的动力反应和动力特性。结果表明随着模拟地震激励的增大,结构的自振频率逐渐衰减,阻尼比逐渐增大;动力放大系数β沿模型高度逐层减小,顶部β的范围为0.166~0.633,说明结构的抗震性能良好;剪力―层间位移滞回曲线饱满,说明模型结构具有较强的耗能能力,其中柱架的耗能能力较强,占滞回耗能总量的91.8%~95.4%,在结构滞回耗能中起主要作用。研究结论对于西安城墙永宁门箭楼复建具有指导意义。

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