摩擦摆支座在矮塔斜拉桥中减震效果研究

Vibration Reduction Effect of Friction Pendulum Bearings in Low-tower Cable-stayed Bridges

矮塔斜拉桥有着良好的受力性能与美观性能,因此抗震设计对矮塔斜拉桥至关重要。摩擦摆式减隔震设计能够将桥梁上部结构与下部结构分离,从而延长结构的自振周期和摩擦耗能机理来降低和耗散传递到桥梁上部结构的能力。本文以靖远金滩黄河大桥(100+168+100)m矮塔斜拉桥为分析模型,利用摩擦摆式减隔震支座对矮塔斜拉桥的墩身进行减隔震研究,运用MIDAS有限元软件输入不同的地震波以检验摩擦摆系统的减震效果。分析结果证明了在矮塔斜拉桥中应用摩擦摆减隔震支座系统的有效性。

Earthquake is a natural disaster phenomenon.The low-tower cable-stayed bridge,for its good mechanical and aesthetic performance,has been widely used in recent years.Therefore,seismic design is very important for low-tower cable-stayed bridges.The friction pendulum system can separate the superstructure from the substructure of bridge,thus extending the natural vibration period and friction energy dissipation of the structure,reducing and dissipating the energy transferred to the superstructure of the bridge.In this paper,the low-tower cable-stayed bridge in Jintan Yellow River Bridge of Jingyuan was taken as the analysis model,and the friction pendulum bearing was used to study the seismic isolation effect of the pier body of low-tower cable-stayed bridge.Different seismic waves were input to test the damping effect of the friction pendulum system by using the Midas finite element software.The analysis results showed that the application of friction pendulum bearing system in low-tower cable-stayed bridge is effective.