曲率半径对大温差地区小半径曲线梁桥地震响应影响分析

为研究曲率半径和近断层脉冲效应对大温差地区小半径曲线梁桥在地震作用下的动力响应和碰撞效应的影响规律,以某大温差地区曲线梁桥为研究对象,建立不同曲率半径的全桥非线性有限元模型,考虑温度变化对支座性能和伸缩缝间距的影响,开展桥梁地震响应分析.结果表明:随着主梁曲率半径增大,墩底内力响应逐渐增加,邻梁间碰撞效应逐渐增强;温度...

Influence of curvature radius on the seismic response of small radiuscurved girder bridges in large temperature difference area

The seismic response and pounding effect of small radius curved girder bridges considering the curvature radius and the near-fault pulse-impulse effect in areas with large temperature difference were analyzed in this paper.Taking a curved gird bridge in large temperature difference area of Northwest China as an project example,different nonlinear finite element models of the whole bridge with different radius of curvature were established.The influence of thermal load on the bearing stiffness and beam expansion deformation was considered.The influence of curvature radius on the seismic response of the curved girder bridge was studied based on the internal force of pier and the pounding effect of adjacent girders.The results showed that with the increase of curvature radius of main beam,both the internal force response of pier bottom and the pounding effect between adjacent beams increase gradually.The internal force of pier bottom at extreme low temperature is much greater than that at extreme high temperature.The internal force of pier bottom under the action of near-fault pulse-like ground motion is larger than that under the action of gar-field ground motion.