地震作用下城市高架连续梁桥碰撞单元刚度参数分析

本文基于Kelvin碰撞单元建立3联城市高架连续梁桥地震碰撞分析模型,采用非线性时程方法对碰撞单元刚度的取值进行了参数分析。分析结果表明:当碰撞单元刚度较小时,相邻梁体间的碰撞力受碰撞单元刚度影响较大,单元刚度取值对于相邻联梁体最大相对位移影响不大;而当碰撞单元刚度大于1联梁体的2倍轴向刚度时,碰撞力和位移的计算结果随碰撞单元刚度的增加变化不超过10%。

Parametric study of the impact stiffness of urban elevated continuous bridge under earthquake

Based on the Kelvin model,impact analysis model of urban elevated continuous bridge is established,and the impact stiffness of urban elevated continuous bridge is discussed with the nonlinear time-history analysis udder earthquake.The analysis results show that when the impact stiffness is smaller,the pounding force change great and the maximum relative displacement caused by the pounding effect change little with the impact stiffness;and when the impact stiffness is larger than 2 times that of the bridge axial stiffness,the pounding force and the relative displacement of multi-span continuous bridge increased basically unchanged.