地震作用下山区陡坡地段桥梁地震响应分析

Seismic Response Analysis of Bridges on Steep Slopes in Mountainous Areas under Earthquake

以山区陡坡桥梁为研究对象,采用Midas有限元软件建立有限元模型,考虑陡坡对桩基地震响应的影响。结果表明,相比于不考虑陡坡,考虑陡坡时桥梁的周期会增长,桥梁结构的振型会改变,桥梁结构的内力减小,这是因为考虑陡坡时,桥梁整体的刚度会变小。考虑桩基础周围土对结构影响时,是根据现场的地势和地质条件进行准确模拟的,更能符合实际的工程情况,山区陡坡桥梁考虑陡坡模拟的方法更与实际工程吻合。

Taking the steep slope bridge in the mountainous area as the research object,the finite element model of Midas finite element software is used to consider the impact of the steep slope on the seismic response of the pile foundation.The results show that compared with not considering the steep slope,the cycle of the bridge will increase when considering the steep slope,the mode shape of the bridge structure will change,and the internal force of the bridge structure will decrease.This is because the overall stiffness of the bridge will become smaller when considering the steep slope.Considering the influence of the soil around the pile foundation on the structure,it is simulated accurately according to the topography and geological conditions of the site,which is more in line with the actual engineering situation,and the steep slope simulation method of steep slope bridges in mountainous areas is more consistent with the actual engineering.