大跨高低塔不对称斜拉桥抗震性能分析与评估

Analysis and Evaluation on Seismic Performances of Long-span Asymmetric Cable-stayed Bridge with High and Low Pylons

摘要:

为了研究大跨斜拉桥的两阶段水准设防下的抗震性能,依托某大跨高低塔不对称斜拉桥,通过有限元模型建立了空间有限元模型,采用了反应谱和线性时程对比分析的方法。分析表明地震作用下,主桥的不利截面分别为双塔的塔底截面,其低塔受横向地震效应影响较大,高塔受纵向地震效应影响较大,设计配筋时应根据受力方向优化。

Abstract:

In order to study the seismic performances of long-span cable-stayed bridge under two-stage horizontal fortification, relying on a long-span asymmetric cable-stayed bridge with high and low pylons, a spatial finite element model is established through the finite element model. The methods of response spectrum and linear time history comparative analysis are adopted. The analysis shows that the unfavorable sections of the main bridge under earthquake are the bottom sections of double pylons. Its low pylon is greatly affected by transverse seismic effect and the high pylon is greatly affected by longitudinal seismic effect. The reinforcement design should be optimized according to the stress direction.