文档介绍：申请同济大学工学硕士学位论文车辆动载作用下轨道结构和隧道结构的动力分析培养单位: 一级学科: 二级学科: 研究生: 指导教师: 土木工程学院土木工程结构工程田薇袁勇教授 2007年3月摘要随着城市地下铁道交通系统的在我国各大城市的快速发展,由轨道交通带来的振动和噪声问题也越来越受到人们的关注,,研究地铁列车引起的振动及减振方法不仅必要而且十分迫切. 因轨道的不平顺以及轮轨问相对运动,地铁运营会产生振动和噪声,振动通过空气介质以及轨道结构一道床一隧道结构一周围土体传播到建筑物中,引发周围建筑物的振动。本文根据轨道不平顺功率普拟合出轨道不平顺时域内的曲线, 建立车辆—钢轨耦合模型,得到时域内的地铁振动荷载:在分析现有无碴轨道结构形式和动力学模型的基础上,以板式轨道重点研究对象,首先将板式轨道简化成为Kelvin地基上的弹性小挠度板,从理论角度分析了板在移动荷载作用下的挠度响应规律,之后,用数值模拟方法研究轨道结构在地铁车辆荷载作用下的动力响应;参数敏感性分析中,发现随着轨下垫层和轨道板下垫层刚度的减小,轨道系统振动的加速度有效值和振动加速度级都呈减小的趋势,当增大轨下垫层和轨道板下垫层阻尼时。轨道系统的振动加速度响应有一定减弱趋势; 此外,对地铁区间隧道进行动力测试,得到了轨道板振动的加速度数据,并且根据测试所得数据拟合出车辆荷载,建立车辆一隧道耦合模型,分析了隧道截面上各典型点的位移响应规律。关键词:地铁,隧道结构,轨道结构,减振,动力分析 Abstract ABSTRACT With thedevelopment ofthe underpass system in our colmtry,the vibrationand noiseproblem which isaroused by thepassing moving metro vehicle e morc andmol' uneasy and damage broughtby thetraffic vibration hasbeen considered tobe one ofthemostunbearable public ,research on the vibrationinduced by metro vehicle isurgent andimportant. The vibrationand noiseofmetro isinduced by theunsmooth oftrack and 50the relmive movement rlthetrackand vibration istransmitted by the tracks岫lctIl∞t0thetunnel structure,inducing thevibrationofsoilaround thetunnel, and isfinally transmitted to theovergroud building ,based on the existing references,I reviewed thevibrationandnoise-evaluatingmethods,and fitted outthemoving load toemulate the truevehicle ording totheunsmoothness paper alsointroduced differenttyped of dynamic model ofthesetrack structure were given precisely and then boththeoretical and numerical method a糟proposed toanalysis thedynamic response oftrackstructure subjected tomoving vehicle parameters which influence thedynamic response oftrack structure were taken into account during conclusion thatwitIItheminishing ofthestiffnessand theincreasing ofthedamping ratioof response ofthetrack