【作者】 郑亮；

【导师】 宋一凡；

【作者基本信息】 长安大学 ， 桥梁与隧道工程， 2011， 硕士

【摘要】 随着我国公路交通事业的快速发展,高墩大跨的连续梁桥和连续刚构桥在我国得到了广泛应用,特别是在西部沟壑地区,这种桥型以良好的跨越能力和较好的经济性,往往成为首选方案。对于这类桥梁的车桥耦合振动问题目前主要采用实桥试验和有限元数值方法进行研究,然而采用模型试验的方法对公路高墩大跨桥梁车桥耦合效应的研究很少。鉴于模型试验具有,经济性好、针对性强、数据准确等特点,有必要对车桥耦合振动模型试验的方法进行研究。本文依托交通部西部科技项目：“高墩大跨桥梁车桥耦合振动及其影响分析研究”的“车桥耦合振动模型试验研究”子题,以模型试验为出发点对车桥耦合振动问题进行了分析和探索,坚持理论与实际相结合。以陕西某高墩大跨刚构-连续梁组合体系桥为实桥,以相似原理和量纲分析为基础,确定模型设计中必须遵循的相似准则,并且根据模型桥与实桥的静动力相似关系设计了1/20的大比例尺模型桥,同时设计了模型桥的静动力试验方案。根据模型桥的车桥耦合试验特点,使用有限元数值方法对模型桥进行分析,主要分析：模型车静止于模型桥的不同位置对桥梁频率的影响；定位激扰力作用下车桥耦合振动系统的响应；模型车以不同速度通过模型桥时车桥耦合振动系统的响应。同时在实验室对模型桥进行静力试验,测试各控制截面的挠度和应变。动力测试主要测试模型桥的自振频率、振型、阻尼比等动力特性,并测试模型车静止于模型桥的不同位置对桥梁频率的影响以及定位激扰力作用下车桥耦合振动系统的响应。结合有限元数值分析结果和实测结果,对车桥耦合振动时桥梁频率变化进行了分析。为了使有限元数学模型与实际模型更好的结合起来,使用ANSYS的优化分析功能,并对基于实测值的车桥耦合有限元模型修正方法进行了研究,同时使用静载试验中测得的挠度和动力试验中的测得的频率作为状态变量,构造目标函数对车桥耦合振动有限元模型进行了修正。更多还原

【Abstract】 With China’s rapid development of road transportation, high-pier and long-span continuous beam bridge and continuous rigid frame bridge have been widely applied in our country. Particularly in the western gully region, this bridge often becomes the preferred solution because of its strong span ability and economy. To the research of vehicle-bridge coupling vibration for this type of bridge, we mainly use real bridge test and the finite element numerical method. However, there is little research to vehicle-bridge coupling effect of high-pier and long-span bridges by the method of model test. In view of model test which enjoys the characteristics of economy, pertinence and accurate results, it is necessary to study the model test of vehicle-bridge coupling vibration.This paper supplemented by the ministry of communications technology projects:"Study on Couping Vibration of Vehicle-Bridge in the High-pier&Long-span Continuous Rigid Frame Bridge" and, it is based on the model test to analyze and explore the problems of vehicle-bridge coupling vibration, combining theory with practice. It adopts a rigid-continuous combination system bridge as real bridge, based on the similarity principle and dimensional analysis, then determines the similarity criteria which must be followed in model design, and designs a 1/20 large scale model bridge according to the static and dynamic similarity between model and real bridge, and also designs the static-dynamic test scheme of model bridge.According to the characteristics of vehicle-bridge coupling test, we analyze the model bridge by finite element numerical method. Main analysis including:the influence to the frequency of bridge when model car on different positions, the response of vehicle-bridge coupling vibration system under positioning disturbing force, the response of vehicle-bridge coupling vibration system when a vehicle through the bridge at different speeds. At the same time in the laboratory we make static tests and test the displacement and strain of control sections. Dynamic tests mainly test the characteristics such as natural frequency, vibration mode and damping ratio, and also test the influence to the frequency of bridge when model car on different positions and the response of vehicle-bridge coupling vibration system under positioning disturbing force. Combining the finite element numerical analysis results and actual results analyse the variations of bridge frequency.In order to better combine the finite element model and actual model, we apply the optimization analysis function of ANSYS, study the finite element model updating method of vehicle-bridge coupling which based on actual data, and make use of the displacement from static test and frequency from dynamic test as state variables, to update the finite element model by constructing objective function.更多还原