车辆移动作用下大跨度连续梁桥动力响应分析
发布时间：2019-06-14 04:18
【摘要】：摘要：大跨度连续梁桥结构在移动荷载作用下动力效应显著。本文以酉水大桥为背景,对大跨度连续梁桥的车辆-桥梁耦合时变系统动力响应进行分析,主要工作如下： 介绍了大跨度连续梁桥动力分析有限元法,建立桥梁结构动力分析模型,推导形成桥梁结构的特性矩阵(单元刚度矩阵、单元质量矩阵和单元阻尼矩阵)。分析了不同自由度车辆模型的优劣,建立了车辆移动荷载7自由度模型,推导出车辆空间振动总势能。阐述了路面不平顺分析方法,对所研究桥梁路面不平顺做了定量模拟。 根据弹性系统总势能不变值原理和“对号入座”法则,建立了车辆-大跨度连续梁桥耦合系统动力方程。运用VBS程序对酉水大桥车辆移动荷载动力响应进行了分析,对比规范计算汽车冲击系数,并采用狄克曼指标对桥梁振动舒适性进行评价。 对车辆-桥梁耦合时变系统动力响应参数进行了分析。研究了桥面不平顺、车辆行驶速度、车辆载重、行车间距、车道数对酉水大桥动力响应和狄克曼指标桥梁振动舒适性的影响以及桥面不平顺、车辆行驶速度、车辆载重对车辆动力响应和ISO标准、Sperling指标车辆行车舒适性规律的影响,得出相关结论以供高速公路大跨度连续梁桥设计施工、日常运营管理参考。
[Abstract]:Abstract: the dynamic effect of long-span continuous beam bridge structure under moving load is remarkable. In this paper, the dynamic response of vehicle-bridge coupling time-varying system of long-span continuous beam bridge is analyzed based on Youshui Bridge. The main work is as follows: the finite element method for dynamic analysis of long-span continuous beam bridge is introduced, the dynamic analysis model of bridge structure is established, and the characteristic matrix of bridge structure (element stiffness matrix, element mass matrix and element damping matrix) is derived. The advantages and disadvantages of vehicle models with different degrees of freedom are analyzed, the 7-degree-of-freedom model of vehicle moving load is established, and the total potential energy of vehicle spatial vibration is derived. This paper expounds the analysis method of pavement irregularity, and makes a quantitative simulation of the pavement irregularity of the studied bridge. According to the principle of invariance of total potential energy of elastic system and the rule of "seat alignment", the dynamic equation of vehicle-long span continuous beam bridge coupling system is established. The dynamic response of the vehicle moving load of Youshui Bridge is analyzed by VBS program, the impact coefficient of the vehicle is calculated by comparing the code, and the vibration comfort of the bridge is evaluated by Dikman index. The dynamic response parameters of vehicle-bridge coupling time-varying system are analyzed. The effects of bridge deck irregularity, vehicle speed, vehicle load, driving distance and lane number on the dynamic response of Youshui Bridge and the vibration comfort of Deckman index bridge, as well as the effects of bridge deck irregularity, vehicle speed, vehicle load on vehicle dynamic response and ISO standard, Sperling index vehicle driving comfort law are studied, and the relevant conclusions are drawn for the design and construction of long-span continuous beam bridge on expressway. Reference for daily operation and management.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.3
[Abstract]:Abstract: the dynamic effect of long-span continuous beam bridge structure under moving load is remarkable. In this paper, the dynamic response of vehicle-bridge coupling time-varying system of long-span continuous beam bridge is analyzed based on Youshui Bridge. The main work is as follows: the finite element method for dynamic analysis of long-span continuous beam bridge is introduced, the dynamic analysis model of bridge structure is established, and the characteristic matrix of bridge structure (element stiffness matrix, element mass matrix and element damping matrix) is derived. The advantages and disadvantages of vehicle models with different degrees of freedom are analyzed, the 7-degree-of-freedom model of vehicle moving load is established, and the total potential energy of vehicle spatial vibration is derived. This paper expounds the analysis method of pavement irregularity, and makes a quantitative simulation of the pavement irregularity of the studied bridge. According to the principle of invariance of total potential energy of elastic system and the rule of "seat alignment", the dynamic equation of vehicle-long span continuous beam bridge coupling system is established. The dynamic response of the vehicle moving load of Youshui Bridge is analyzed by VBS program, the impact coefficient of the vehicle is calculated by comparing the code, and the vibration comfort of the bridge is evaluated by Dikman index. The dynamic response parameters of vehicle-bridge coupling time-varying system are analyzed. The effects of bridge deck irregularity, vehicle speed, vehicle load, driving distance and lane number on the dynamic response of Youshui Bridge and the vibration comfort of Deckman index bridge, as well as the effects of bridge deck irregularity, vehicle speed, vehicle load on vehicle dynamic response and ISO standard, Sperling index vehicle driving comfort law are studied, and the relevant conclusions are drawn for the design and construction of long-span continuous beam bridge on expressway. Reference for daily operation and management.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.3
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