基于拟原始地震波的斜拉桥地震响应分析
首发时间:2009-07-14
摘要:为了获得合理的地震波以准确地模拟桥梁的实际地震响应,选择与桥址处场地条件基本吻合的地震波,通过有效峰值速度EPV和有效峰值加速度EPA之间数学关系转换对其频谱特性进行甄别,并应用双指标控制方法进行检定。然后,对其强度、持续时间进行调整,获得符合场地条件的拟原始地震波。以郑州市中心的一座跨铁路支承体系斜拉桥为研究对象,分别采用反应谱法和以拟原始地震波与人工地震波为激励的时程分析法进行地震响应计算,结果表明:采用拟原始地震波进行时程分析所得结果与反应谱法相差不超过20%;与人工地震波结果相差不超过10%。证明选择拟原始地震波作为地振动输入是合理可靠的,可以取得良好的分析效果,而且获得拟原始地震波的方法更简易,为地震波的选择提供了一种新的有效途径。
关键词: 拟原始地震波 频谱特性 双指标控制 支承体系斜拉桥 时程分析
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Earthquake response analysis of cable-stayed bridge based on the
Abstract:In order to obtain reasonable seismic wave to accurately simulate the actual seismic response of bridges, seismic waves were selected to consist with bridge site on the whole, and the spectral characteristics were discriminated by mathematic relation conversion between effective peak velocity EPV and effective peak acceleration EPA and were examined by double index control. And then the pseudo-original seismic waves were acquired when the strength and duration were more adjusted. Taking the railway cable-stayed bridge with support system on centre of Zhengzhou city as study object, seismic responses are carried out by response spectrum method and time-history analysis method with pseudo-original seismic wave and artificial seismic wave as excitation. The results show that: the difference between the results of pseudo-original seismic wave and response spectrum method are less than 20%, and the difference compared with artificial seismic wave are less than 10%. Selecting pseudo-original seismic wave as ecxitation is proved reasonably and reliably, and good analysis results can be acquired. The way to get pseudo-original seismic wave is easier, and a new effective way to choose seismic wave is provided.
Keywords: pseudo-original seismic waves spectrum properties double index control cable-stayed bridge with support system time-history analysis
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No.3383848511312475****
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