【作者】 张波；

【导师】 邓江东；

【作者基本信息】 广州大学 ， 建筑与土木工程（专业学位）， 2018， 硕士

【摘要】 匝道桥多为曲线结构,桥墩高度不一,为极其不规则桥梁结构体系,和其它类型桥梁有明显的不同。同时,匝道桥一般设置一个或者多个固结墩,加剧了桥梁结构刚度分布的不规则,在地震作用下固结墩受到压、弯、剪、扭荷载的复合作用,容易发生震损破坏。因此,系统研究非规则匝道桥结构在地震作用下的非线性响应规律具有重要意义。本文以广东博罗至龙岗某匝道桥为研究对象,对其在不同参数下的地震响应规律进行研究,具体研究工作包括以下几个方面:(1)使用python语言,二次开发编写了提取ABAQUS内力结果的程序。(2)运用ABAQUS软件建立了不同曲率半径和桥墩高度匝道桥的有限元模型,运用弹塑性时程分析方法,深入研究了曲率半径和桥墩高度对桥墩内力、位移、加速度、损伤和钢筋应变等的影响。(3)对曲率半径为150m的匝道桥进行0°~180°多方向输入地震波,运用弹塑性时程分析方法,研究地震波输入方向对匝道桥桥墩内力、位移的影响规律。(4)研究了纵坡变化对匝道桥弹塑性地震响应规律的影响,讨论了桥墩刚度变化对桥墩地震响应规律的变化。(5)通过对采用铅芯橡胶支座匝道桥有限元模型进行非线性弹塑性时程分析,研究了曲线和桥墩刚度不规则条件下铅芯橡胶支座的减震效果。更多还原

【Abstract】 The irregularity of the ramp bridges,such as the structural curvature and different pier height,which is obviously different from other types of bridges.At the same time,The ramp bridges generally have one or more consolidation piers.In the earthquake the complex loading states of pressure,bending,shear,and torsion in the consolidated piers of ramp bridges are induced.It has been found that the consolidated piers severely destroyed in past earthquakes.The ramp bridges are severely damaged by the earthquake and the main line will lose its original function.Therefore,it is of great significance to systematically study the seismic response of ramp bridges.As the object of this study,it is a ramp bridge from Boluo city to Longgang city.This paper studies the seismic response law of multiple parameters of ramp Bridge.The specific research work includes the following aspects:(1)Using the python language,a program was written to extract the results of ABAQUS.(2)The ABAQUS software was used to establish the finite element model of ramp bridge with different curvature radius and bridge pier height.Using the elastic plastic time history analysis method,the effects of radius of curvature and height of pier on the internal force,displacement,damage and reinforcement strain of piers were studied.(3)Multi-directional input seismic wave from 0 to 180 for a ramp bridge with a radius of curvature of 150 m,Studying the Influence of Input direction of Seismic Wave on the Internal force and displacement of bridge Piers(4)When the radius of curvature is 150 m,the seismic response of ramp bridge under different longitudinal slope was analyzed.The ramp bridge slope is 4%,change the radius of curvature,analyze the influence of radius of curvature on the ramp bridge under earthquake.(5)A finite element model of the ramp bridge using lead rubber bearings was established.By the elastic plastic time history analysis method,the influence of the parameters of longitudinal slope,radius of curvature and pre-yield stiffness of the bearings on the seismic isolation of lead rubber bearings was studied.更多还原