V形墩连续刚构桥静动力行为及地震响应分析

以新洋港V墩连续刚构桥为工程背景，采用结构分析软件Midas／civil2010建立空间有限元模型，进行施工全过程仿真分析，计算主桥各个施工阶段和运营阶段不利荷载组合下的内力、应力和变形情况；同时，进行动力特性分析，并分别用反应谱法和一致时程激励法计算主桥在El地震作用下的内力和位移响应．计算表明，施工及运营阶段主桥受力合理，满足规范要求；地震作用下的位移响应较小，考虑竖向地震作用对V墩轴力和主跨跨中内力影响较大，计算结果可为抗震设计提供依据．

Analysis of Static and Dynamic Behaviors of Continuous Rigid Frame Bridge with V-Shaped Piers and Seismic Response

Based on a 3-D FEM simulation model of Xinyanggang continuous rigid frame bridge with V-shaped piers,a space finite element model is established by using Midas/civil 2010,a structure analysis software,to simulate and study the whole construction process of the bridge.In addition,the internal force,stress and deformation of the main bridge under unfavorable load combination at different construction and running stages are calculated;a dynamic analysis is then carried out.Also,the stress and the seismic response of this bridge under E1 earthquake action are analyzed by adopting response spectrum method and dynamic time-history analysis method,respectively.The calculation results indicate that the stress of the main bridge in the course of construction and running is reasonable,which satisfies the standard requirements;the displacement response of the main bridge in an earthquake is not strong;vertical seismic force produces enormous impacts on the axial force of the V-shaped piers and the internal force of the middle main span.The results of the calculation can provide reference for antiseismic designs.