基于承载能力鉴定的大跨径钢桁架桥梁安全评估分析

发布时间：2018-05-06 20:01

本文选题：钢桁架桥梁 + 承载能力　；参考：《重庆交通大学》2014年硕士论文

【摘要】：随着社会不断的发展,汽车保有量的不断增加,庞大的车流量对已建道路、桥梁造成了不同程度的破坏;尤其是使用时间较为长久的大跨径桥梁,随着时间、环境等因素的不断变化,桥梁的工作状态、使用性能及承载能力也受到较大影响。本文以重庆牛角沱嘉陵江钢桁架为研究对象,采用理论研究、数值模拟、结构检算分析及桥梁静动荷载试验相结合的方式对其进行安全性评估,为桥梁正常安全的运营提供理论指导,具体的研究内容如下:(1)运用桥梁承载力的相关理论对桥梁进行安全性评估,通过有限元软件Midas Civil对桥梁进行建模,为评价桥梁的承载能力并对其进行安全评估奠定基础。(2)对钢桁架桥主桥钢结构、桥面板及人行道板、墩台及支座、伸缩缝、桥面系及附属设施进行检查,验证是否有危害桥梁结构安全的病害,进而提出维修建议。(3)对钢桁架桥主桥钢桁架、桥面车行道板及桥墩群桩基础进行结构检算,以验证大桥是否符合结构规范与设计要求。(4)通过静力荷载试验,测定桥梁在试验荷载作用下指定截面中的应力、挠度或位移值,将实测值与理论值进行对比分析,以验证大桥是否符合规范与设计要求。(5)通过控制荷载试验的加载原则,对静荷载试验方法和动荷载试验方法分别进行分析研究,基于荷载试验对桥梁承载力进行评定,探讨桥梁的实际结果是否符合规范计算的理论结果。(6)通过动力荷载试验,测定桥梁在试验荷载作用下的汽车荷载冲击系数、主梁自振频率等动力特性参量。(7)通过外观检查、结构检算、静力荷载试验、动力荷载试验及裂缝观测的试验结果,对桥梁结构整体安全性做出评估,为桥梁加固、维修提供建议,并为以后的养护维修工作提供科学的数据资料。
[Abstract]:With the development of society and the increasing number of cars, the huge traffic volume has caused different damage to the roads and bridges, especially the long-lasting long-span bridges, which are used for a long time. The continuous change of environment and other factors, the working state, service performance and bearing capacity of the bridge are also greatly affected. In this paper, the steel truss of Nijiaotuo Jialing River in Chongqing is taken as the research object. The safety of the truss is evaluated by the combination of theoretical research, numerical simulation, structural checking and analysis and static and dynamic load test of bridges. The specific research contents are as follows: 1) using the theory of bridge bearing capacity to evaluate the safety of bridge, and modeling the bridge by finite element software Midas Civil. In order to evaluate the bearing capacity of the bridge and evaluate its safety, the steel structure, deck slab and sidewalk slab, pier abutment and support, expansion joint, deck system and ancillary facilities of the steel truss bridge are inspected. To verify whether there is any damage to the safety of the bridge structure, and then put forward the maintenance suggestion. (3) to check and calculate the steel truss of the main bridge of the steel truss bridge, the vehicular slab of the deck and the pile foundation of the piers. In order to verify whether the bridge meets the structural specifications and design requirements. (4) through static load tests, the stress, deflection or displacement values of the specified section of the bridge under test load are measured, and the measured values are compared with the theoretical values. In order to verify whether the bridge conforms to the specifications and design requirements, the static load test method and the dynamic load test method are analyzed and studied respectively through the loading principle of the control load test, and the bearing capacity of the bridge is evaluated based on the load test. To find out whether the actual results of the bridge accord with the theoretical results calculated by the code. (6) through the dynamic load test, the dynamic characteristic parameters of the bridge, such as the impact coefficient of automobile load, the natural vibration frequency of the main beam and so on, are determined under the test load. The results of structural check, static load test, dynamic load test and crack observation are used to evaluate the overall safety of bridge structure and provide suggestions for bridge reinforcement and maintenance. And for the future maintenance and repair work to provide scientific data.
【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】：U447

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