大跨度钢桁架公轨两用斜拉桥静动力试验分析

发布时间：2019-04-11 16:10

【摘要】：荷载试验是一门实践性很强的科学技术,其涉及的内容包含结构设计和施工工艺等,具有较强的综合性、应用性和复杂性。对于特殊结构桥梁的荷载试验是一种科学研究性的试验。斜拉桥以其自身具有的优越性得到广泛的推广,现代斜拉桥的发展越来越大跨径化。本文以重庆东水门长江大桥荷载试验为依托对大跨度钢桁架共轨两用斜拉桥的荷载试验进行了研究。本文对桥梁的静、动载试验方法进行了归纳总结,并对试验方案的制定以及结构分析有限元法进行了研究。结合重庆东水门长江大桥的特点进行有限元建模,采用有限元方法对该桥进行理论计算和分析,并得到相应的理论计算数据,设计出该桥的静荷载和动荷载的试验方案,方案中确定了荷载试验的工况和测点布置等。在保证荷载试验效果的前提下,将各工况控制截面的实测变形与理论计算值进行对比,计算结构的校验系数,确定了结构受力性能满足设计荷载的要求。同时在动载试验中进行了跑车、刹车试验,经过数据分析,确定了该桥的实际冲击系数,将其与理论设计值进行对比。利用Midas/Civil建立重庆东水门长江大桥的空间有限元模型,并进行理论上的模态分析,得到该桥的理论自振振型和频率,并与实测模态参数进行比较分析。通过对荷载试验结果的分析,了解该桥结构的实际受力状况和工作性能。经过对实测数据的对比分析,为同类型桥梁的设计、养护、施工积累可靠资料。并结合重庆东水门长江大桥对大跨度共轨两用斜拉桥的静动力特性进行了总结归纳,并提出改进建议。
[Abstract]:Load test is a very practical science and technology, which involves structural design and construction technology, and has strong comprehensiveness, application and complexity. The load test of bridge with special structure is a scientific research test. Cable-stayed bridges have been widely popularized because of their own advantages, and the development of modern cable-stayed bridges is becoming more and more large-span. Based on the load test of Chongqing Dongshuimen Yangtze River Bridge, the load test of long-span steel truss common rail cable-stayed bridge is studied in this paper. In this paper, the static and dynamic load test methods of bridges are summarized, and the formulation of the test scheme and the finite element method of structural analysis are studied. Based on the characteristics of Chongqing Dongshuimen Yangtze River Bridge, the finite element method is used to calculate and analyze the bridge theoretically, and the corresponding theoretical calculation data are obtained. The test scheme of static load and dynamic load of the bridge is designed. In the scheme, the working conditions of load test and the layout of measuring points are determined. On the premise of ensuring the effect of load test, the measured deformation of the control section under various working conditions is compared with the theoretical calculation value, and the calibration coefficient of the structure is calculated, and the load performance of the structure is determined to meet the requirements of the design load. At the same time, the actual impact coefficient of the bridge is determined through the data analysis of the sports car and brake test in the dynamic load test, and the comparison with the theoretical design value is carried out. The spatial finite element model of Chongqing Dongshuimen Yangtze River Bridge is established by using Midas/Civil and the theoretical modal analysis is carried out. The theoretical vibration modes and frequencies of the bridge are obtained and compared with the measured modal parameters. Through the analysis of load test results, the actual stress condition and working performance of the bridge structure are understood. Through the comparison and analysis of the measured data, the reliable data are accumulated for the design, maintenance and construction of the same type of bridges. The static and dynamic characteristics of long-span common-rail cable-stayed bridge are summarized based on the Dongshuimen Yangtze River Bridge in Chongqing, and suggestions for improvement are put forward.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U446

【相似文献】