白沙长江大桥横向抗震体系研究

Study on Transverse Seismic System of Baisha Yangtze River Bridge

摘要:

白沙长江大桥是一座塔墩梁固结的主桥长为920 m的双塔独柱式混合梁斜拉桥。为了研究其辅助墩和过渡墩处横桥向的合理约束体系，分别在横向自由、横向约束、过渡墩约束及辅助墩约束4种约束体系下进行时程分析，研究斜拉桥在不同横向约束体系下的地震响应特点，针对混凝土刚性挡块和粘滞阻尼器减震体系分析不同参数对抗震性能的影响。结果表明：采用混凝土刚性挡块对同时减小各墩的横向地震响应作用较小；采用粘滞阻尼器体系可以有效减小各墩的横向地震响应，以及墩梁相对位移。

Abstract:

Baisha Yangtze River Bridge is a 920-m long double-pylon one-column composite beam cable-stayed bridge. Its pylon, pier and beam are consolidated. In order to study the reasonable restraint system of the lateral direction of its auxiliary pier and transition pier, the time history analysis is performed respectively under four restraint systems of the transverse free, lateral restraint, transition pier restraint and auxiliary pier restraint. The seismic response characteristics of the cable-stayed bridge under the different lateral restraint systems are studied. Aiming at the concrete rigid stop dog and viscous damper damping system, the influences of the different parameters on the seismic performance are analyzed. The results show that the rigid concrete stop dog has little effect on reducing the lateral seismic response of each pier at the same time. The transverse seismic response of each pier and the relative displacement of pier beam can be reduced effectively by using viscous damper system.