【摘要】 地震经验表明:地面运动的频谱特性对大跨径桥梁结构地震反应的影响显著。生成合理的人工波,对一座高速公路双塔大跨径斜拉桥进行非线性动力时程分析,对比地震波反应谱与斜拉桥结构地震反应的相关性表明:不同反应谱区段的累积质量参与系数以及谱形的差异程度对结构地震反应影响显著,短周期反应谱区段的影响要大于长周期区段。在动力分析中选择输入地面运动时,需要综合考虑对结构地震反应贡献显著的所有反应谱区段与目标谱的匹配情况。更多还原

【Abstract】 The frequency content of earthquake ground motions has an important effect on the seismic response of the long-span bridges because of complexity of dynamic properties.The nonlinear dynamic time-history analysis is conducted for a two-pylon long-span cable-stayed bridge from artificial earthquake accelerograms.The correlation between the frequency content of earthquake accelerograms and the seismic response of the cable-stayed bridge reveals that the cumulative modal mass participation and difference in different parts of response spectra have significant effects on the seismic response of structures.The effects of the short-period parts of response spectra on seismic response are more significant than those of the long-period parts.All parts of response spectra which have great contribution to the seismic response of structures should be matched to target spectra.更多还原