桥梁抗震设计中滑移挡块作用机理

Mechanism of Sliding Block in Bridge Seismic Designing

基于能量耗散理论及地震动力响应分析,研究了不同地震荷载水平下滑移挡块及桥跨结构承载变化趋势,分析结果说明,滑移挡块在地震荷载下依靠滑移产生摩擦阻力消耗一部分地震力,不会使桥跨结构产生过大刚度而将巨大地震冲击力反馈给下部桥墩及桩基,同时挡块将桥梁破损控制在一定范围内,能量大部分由挡块承担,导致主体结构受损较小,受损严重的挡块在震后也较容易进行快速修复。

Based on energy dissipation theory and seismic dynamic response analysis this paper studied on the variation trends of sliding block and the bridge span structures bearing under the different levels of seismic loading. The results revealed the sliding block relying on silpping generated friction force for consumption part of the seismic load in the earthquake,so the bridge span structures does not make more rigidity to generate huge earthquake force that feedback to the lower part of the piers and pile foundation,while sliding block controlled the bridge damage within a certain range,the block took on largely energy,causing the main structure small damage,more damaged block was carried up quick fix easily after the earthquake.