曲率半径和激励角度对刚构桥地震响应的影响

发布时间：2018-01-26 14:06

本文关键词： 桥梁工程曲线连续刚构桥曲率半径激励角度地震响应反应谱法有限元法　出处：《沈阳建筑大学学报(自然科学版)》2017年02期 　论文类型：期刊论文

【摘要】：目的研究曲率半径和地震动激励角度对高墩大跨连续刚构桥地震响应的影响,确定该类桥型的最不利地震激励方向.方法以某跨度为(70+3×127+70)m的公路连续刚构桥为背景进行分析,采用有限元法建立全桥模型,并考虑桩-土相互作用,探讨曲率半径对结构动力特性的影响;采用反应谱法研究地震作用下桥梁结构的内力和位移响应.结果分析结果表明:曲率半径对该类桥的自振特性有较大影响,随着曲率半径的减少,结构的自振频率和整体刚度逐渐降低;在纵桥向激励时,随着曲率半径的增大,桥墩纵桥向的内力及位移均有增大趋势,在横桥向激励时,随着曲率半径的增大,桥墩横桥向的内力及位移变化规律不明显.结论该类桥梁的最不利地震动激励方向并不是纵桥向和横桥向,其最不利地震动激励角度大致为80°和165°.
[Abstract]:Aim to study the effect of radius of curvature and excitation angle of ground motion on seismic response of long-span continuous rigid frame bridge with high piers. The most unfavorable seismic excitation direction of this kind of bridge type is determined. Based on the analysis of a highway continuous rigid frame bridge with a span of 703 脳 127 70m, the finite element method is used to establish the full bridge model. Considering the pile-soil interaction, the influence of radius of curvature on the dynamic characteristics of the structure is discussed. The response spectrum method is used to study the internal force and displacement response of bridge structure under earthquake. The results show that the radius of curvature has a great influence on the natural vibration characteristics of the bridge and decreases with the decrease of the radius of curvature. The natural vibration frequency and the overall stiffness of the structure decrease gradually. With the increase of curvature radius, the internal force and displacement of pier longitudinal bridge increase with the longitudinal bridge excitation, and the curvature radius increases with the transverse excitation. The variation of internal force and displacement of bridge piers is not obvious. Conclusion the most unfavorable ground vibration excitation direction of this kind of bridge is not longitudinal bridge direction and transverse bridge direction, and the most unfavorable ground motion excitation angle is about 80 掳and 165 掳.
【作者单位】：西南交通大学土木工程学院;陆地交通地质灾害防治技术国家工程实验室;
【基金】：国家重点研发计划项目(2016YFB1200401) 国家自然科学基金项目(51308471) 广东省交通厅科技计划项目(2014-02-015)
【分类号】：U442.55;U448.23
【正文快照】： 我国地域幅员辽阔,山区地形地势条件极其复杂,修建高等级公路需要桥梁服从道路线形的要求,因而不可避免地要修建高墩大跨度曲线桥梁[1].由于曲率半径的存在,曲线连续刚构桥在其自身重力作用下将产生扭转,其弯扭耦合效应将导致该类桥没有明显的主方向[2].且该类桥梁在两个垂直

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