斜拉-悬索协作体系桥基于桩-土-结构相互作用的地震响应研究

摘要

以大连湾跨海大桥协作体系桥方案为研究对象,基于大型有限元分析软件ANSYS建立了该桥的三维有限元模型,采用等效嵌固模型模拟了土-桩-结构的相互作用,以此为基础对该方案桥的自振特性进行了分析,重点研究了桩-土-结构相互作用下斜拉-悬索协作体系桥的地震响应,分析结果表明自锚式体系的加劲梁与主塔的纵向位移、塔底、主跨跨中弯矩均大于地锚式体系;但加劲梁竖向位移、主塔塔底轴力则小于地锚式体系。%Based on scheme of Dalian gulf cross-sea bridge,in this paper,a 3-dimensional FE model for self-anchored cable-stayed suspension bridge is established with finite element program ANSYS and pile-soil-structure interaction is simulated by use of the equivalent embed fixation model.Based on the FE model,model analysis is carried out and the effects of pile-soil-structure interaction on dynamic behavior of cable-stayed suspension bridge are specially studied.The analysis result show that longitudinal displacement of stiffening beam and tower,moment at bottom of tower and in middle of main span for self-anchored system is more than earth-anchored;but vertical displace of stiffening beam and axial force at bottom of tower is less than earth-anchored system.