滑动摩擦隔震桥梁振动台试验研究

Shaking table tests of bridge model with sliding friction isolation bearings

滑动摩擦隔震支座具有良好的耗能能力、较大水平位移能力和较好的耐久性能,为桥梁减隔震设计提供了一种新方法。本文针对分别安装有单球面摩擦摆支座、双凹面摩擦摆支座、多球面滑动摩擦支座的3种隔震桥梁模型开展了振动台试验研究。通过观察和量测模型桥梁位移、加速度等反应,得出采用3种滑动摩擦支座的隔震桥梁反应特性和隔震效果。由此可知,滑动摩擦隔震支座能有效减小地震对桥梁上部结构的影响,滑动摩擦隔震支座的自振周期与桥梁上部结构无关,只与支座摩擦系数和等效曲率半径相关。

Sliding friction isolation bearing has good capacity of energy dissipation,large horizontal displacement and durability,providing a new approach for the seismic isolation design of bridge. In this paper,shaking table tests of bridge model with a friction pendulum bearing,double concave friction pendulum bearing,multi-spherical sliding friction bearing were conducted. By observing and measuring the displacements,accelerations and other reactions of bridge model,the response characteristics and isolation effect of the bridge with three sliding friction bearings were obtained,the results that isolation bearing can reduce the impact of earthquakes on the superstructure of the bridge effectively were illustrated. And the self-vibration period of the bridge with sliding friction isolation is only relevant with the friction coefficient and the equivalent radius of curvature of the isolation bearing.