大跨径桥梁结构概率地震需求分析中地面运动强度参数的优化选择

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振动与冲击 ›› 2011, Vol. 30 ›› Issue (10) : 91-97.

论文

大跨径桥梁结构概率地震需求分析中地面运动强度参数的优化选择

陈亮1; 李建中2

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Optimal selection of ground motion intensity measures for probabilistic seismic demand analysis of long-span bridge structures

Chen Liang1; Li jian-zhong2

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摘要

对于大跨径桥梁结构，应结合地震工程学和结构抗震两个方面选择合理的地面运动强度参数（IM），进行动力分析。针对一座高速公路双塔斜拉桥采用非线性动力时程分析方法，分析不同的IM对于结构地震需求的影响，可以得到以下结论：对于不同桥向，在累积质量参与系数贡献显著的周期范围内，反应谱对结构地震需求影响显著，且高频区段反应谱的影响大于低频区段。应该采用对结构地震需求影响显著的反应谱区段内质量参与系数较大的短周期谱加速度或PGA作为IM。

Abstract

Intensity measures (IM) should be reasonably selected on the basis of earthquake engineering and earthquake resistance of structures for seismic design and analysis of long-span bridges. The nonlinear dynamic time-history analysis was conducted for a long-span highway cable-stayed bridge with two towers. It is concluded that the influence of frequency content in the range of period with predominant cumulative modal mass participation on structural seismic demands is significant because of obvious higher mode effects in different directions of long-span bridges. The effects of spectra in the high-frequency domain on structural seismic demands are more than in the low-frequency domain. In general, PGA and short-period spectra accelerations are applicable to be as IMs to conduct dynamic time-history analysis.

导出引用

陈亮;李建中. 大跨径桥梁结构概率地震需求分析中地面运动强度参数的优化选择[J]. 振动与冲击, 2011, 30(10): 91-97

Chen Liang;Li jian-zhong. Optimal selection of ground motion intensity measures for probabilistic seismic demand analysis of long-span bridge structures [J]. Journal of Vibration and Shock, 2011, 30(10): 91-97