车载下既有损伤公路混凝土简支梁桥动力响应分析

发布时间：2018-05-29 01:24

本文选题：多尺度模型 + 车桥耦合振动　；参考：《哈尔滨工业大学》2014年硕士论文

【摘要】：以往的公路桥梁车桥耦合振动的相关研究，主要关注车辆荷载作用形式、桥面几何特征等因素对桥梁动力响应的影响、考虑地震或风荷载作用下的车桥系统动力响应等问题。而对于既有桥梁各种损伤状况对车载下桥梁动力工作性能的影响规律，以及结构损伤、损伤演化与车桥动力行为的相互作用机理等方面还未见系统深入的研究，相关的基础研究工作亟待开展。在桥梁运营过程中，桥梁结构损伤与车桥耦合作用已是影响桥梁安全运行的重要因素之一。本文针对既有损伤桥梁在车载下的动力响应等相关问题进行分析研究。依据交通荷载调查分类，分别建立各类车型的空间车辆模型，并用Lagrange方程推导各类车辆运动方程，完善了公路桥梁典型车辆的动力分析模型。基于多级结构理论以及模态综合法，建立了具有较高计算效率和精度，可反映混凝土简支梁桥局部细节及整体动力行为的车桥耦合振动的多尺度分析方法和计算模型，结合ANSYS有限元软件计算分析，采用Matlab编制混凝土简支梁桥动力分析程序，并根据某实际装配式空心板混凝土简支梁桥的动载试验进行程序验证。以既有旧桥试验检测数据资料为基础并结合国内外相关资料和研究文献的调研，系统分析混凝土梁桥各类典型损伤的产生机理和演化特点，对桥梁损伤进行分类，同时对各种桥梁损伤模拟策略和方法进行总结比较，提出并建立适于车桥动力分析的混凝土梁桥损伤的数值分析模型。基于损伤模拟及车桥耦合振动多尺度分析方法的基础上，针对损伤类型和损伤状态，，将损伤模型引入到桥梁多尺度分析模型中，通过对结构损伤参数的激活和修改，建立各类损伤的混凝土梁桥车桥耦合振动多尺度分析方法，编制相关的分析程序。最后以某装配式空心板混凝土简支梁桥为例，分析其在各类损伤下的动力响应，同时基于动力分析的角度，对既有损伤混凝土简支梁桥的限载限速研究提供理论依据。
[Abstract]:Previous studies on vehicle-bridge coupling vibration of highway bridges mainly focus on the effects of vehicle load forms, bridge deck geometry and other factors on the dynamic responses of bridges, and consider the dynamic responses of vehicle-bridge systems under earthquake or wind loads. However, the influence of various damage conditions of existing bridges on the dynamic performance of bridges under vehicle, as well as the structural damage, the mechanism of interaction between damage evolution and vehicle-bridge dynamic behavior, has not been systematically studied. Relevant basic research work needs to be carried out urgently. In the process of bridge operation, the coupling of bridge structure damage and vehicle-bridge is one of the important factors that affect the safe operation of bridge. In this paper, the dynamic response of existing damaged bridges under vehicle is analyzed and studied. According to the classification of traffic load investigation, the spatial vehicle models of various types of vehicles are established, and the motion equations of various types of vehicles are deduced by using Lagrange equation, which improves the dynamic analysis model of typical vehicles of highway and bridge. Based on multi-stage structure theory and modal synthesis method, a multi-scale analysis method and calculation model of vehicle-bridge coupling vibration with high calculation efficiency and precision, which can reflect the local details and global dynamic behavior of concrete simply supported beam bridge are established. Combined with the finite element analysis of ANSYS software, the dynamic analysis program of concrete simply supported beam bridge is compiled by Matlab, and the program is verified according to the dynamic load test of a practical hollow slab concrete simply supported beam bridge. Based on the existing old bridge test data, combined with the domestic and foreign related data and research literature, the mechanism and evolution characteristics of various typical damage of concrete girder bridge are analyzed systematically, and the damage classification of the bridge is carried out. At the same time, the damage simulation strategies and methods of various bridges are summarized and compared, and a numerical analysis model of concrete beam bridge damage suitable for vehicle-bridge dynamic analysis is proposed and established. Based on the damage simulation and the multi-scale analysis method of vehicle-bridge coupling vibration, the damage model is introduced into the bridge multi-scale analysis model according to the damage type and damage state, and the damage parameters are activated and modified. The multi-scale analysis method of vehicle-bridge coupling vibration of concrete girder bridge with various kinds of damage was established and the related analysis program was compiled. Finally, taking a prefabricated hollow slab concrete simply supported beam bridge as an example, the dynamic response of the bridge under various kinds of damage is analyzed. At the same time, based on the angle of dynamic analysis, it provides a theoretical basis for the research of limited load and speed limit of existing damaged concrete simply supported beam bridge.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.3

【参考文献】