河口黄河大桥减隔震措施研究

Study of Seismic Isolation Measures for Yellow River Bridge in Hekou

河口黄河大桥主跨360 m,为我国Ⅷ度及以上地震区最大跨度的斜拉桥,桥塔设计受抗震控制,需采取合理的减隔震措施保证结构的安全和经济性。介绍了河口黄河大桥的地震非线性时程分析方法,重点分析对比了不同参数下塔梁弹性约束和使用液体黏滞阻尼器两种隔振体系的结构响应。结果表明,相对于塔梁弹性约束体系,设置液体黏滞阻尼器对减少本桥地震效应更为有效,其研究成果对同类大桥的设计与计算工作具有一定理论指导作用。

The main span of Yellow River Bridge in Hekou is 360 m long. It is the longest span of cable-stayedbridge in the VIII and above earthquake area of China. The design of bridge pylon is controlled by the seismic resistance. It is required to take the reasonable seismic isolation measures to guarantee the safety and economy of structure. The article introduces the seismic non-linear time-historical analysis method of Yellow River Bridge in Hekou, and focuses analysis and comparison on the structural responses of two vibration isolation systems with the elastic constraints of pylon and beam, and using the fluid viscous damper under the different parameters. The result shows that it is more effectively to set up the fluid viscous damper to reduce the seismic effect on this bridge than the elastic constraint system of pylon and beam. Its study result provides a certain theoretical guidance to design and calculate the similar bridges.