地震作用下城市立交抗震挡防撞措施分析

为了明确地震作用下抗震挡前设置防撞装置对结构抗震性能的作用,通过非线性时程反应分析,应用接触单元对比了城市立交中抗震挡设置了防撞装置后的结构抗震性能。由有防撞装置单墩模型参数分析以及一联简支梁设置与不设置防撞装置模型的对比分析可知:防撞装置的最大容许变形量是防撞效果的重要控制参数,在抗震设计中应综合考虑结构碰撞刚度、防撞装置可以提供的变形量以及构造许可等因素。

Analysis of Crashworthy Measure of Reinforced Concrete Block on Anti-seismin Urban Interchange Bridge Under Earthquake

In order to find out the structural seismic effects about fixing flexible device in front of the reinforced concrete block to decrease pounding,the seismic performances of the reinforced concrete block on anti-seism behavior with crashworthy device in urban interchange bridge under earthquake were explored by simulating pounding with nonlinear contact element during the nonlinear time-history analysis.By parameters analysis of single column model with crashworthy device and the contradistinctive analysis of simple supported bridge model with or without crashworthy device,the allowable maximum deformation of crashworthy device is the manipulative parameter for decreasing pounding effects which is obtained from the analytical results.Furthermore,impact stiffness,allowable maximum deformation of crashworthy device,limitation of construction should be taken into consideration during seismic design process.