中承式钢管混凝土拱桥静动载试验应用研究

发布时间：2018-04-17 12:04

本文选题：钢管混凝土拱桥 + 静载试验　；参考：《河北工业大学》2015年硕士论文

【摘要】：桥梁荷载试验是对桥梁健康状况了解的一个重要手段,也是基于桥梁全寿命理念进行桥梁管理与养护的一个重要手段。它是一门直接服务工程实践的一项细致复杂的工作,涉及桥梁的设计计算理论、实验测试技术、仪器仪表性能、数理统计分析、现场试验组织等方面,具有综合性、复杂性、应用性。本文以邯郸市某中承式钢管混凝土拱桥为工程背景,在总结了钢管混凝土拱桥的发展历史及钢管混凝土拱桥动静载试验理论的基础上做了如下研究工作:利用有限元分析软件Midas civil建立钢管混凝土拱桥的结构计算模型,根据桥梁结构特性和内力计算确定静载试验的加载工况、各工况下的加载与卸载过程与量级、以及主要控制截面和截面中测点的布置。在静载试验测得的桥梁在控制截面中的实际应变和挠度等实测值与计算模型的理论值进行分析比对,结合交通运输部2011年最新颁布的公路桥梁技术状况及承载力评定标准,确定桥梁的实际承载能力满足正常通车要求。利用有限元软件对该桥进行理论模态分析,计算出该桥的理论自振频率和振型,分析得出该桥的面内刚度大于面外刚度,符合钢管混凝土拱桥的振型规律,并通过动载试验测得实测值与理论值比较接近,且实测值大于理论值,说明结构整体受力良好。动载试验通过脉动试验和行车试验检测了桥梁的应变增大系数和自振频率,且得出应变增大系数基本处于合理范围之内。通过静载、动载试验的测试及分析,可以得出主桥和引桥的承载能力满足设计要求,满足正常通车要求。
[Abstract]:Bridge load test is not only an important means to understand the bridge health condition, but also an important means of bridge management and maintenance based on the concept of bridge life.It is a meticulous and complex work in the practice of direct service engineering. It involves the design and calculation theory of bridge, experimental test technology, instrument performance, mathematical statistics and analysis, field test organization, etc., it is comprehensive and complex.Application.This paper takes a middle through concrete filled steel tube arch bridge in Handan as the engineering background.On the basis of summarizing the development history of CFST arch bridge and the theory of static and static load test of CFST arch bridge, the following research work is done: the structural calculation model of CFST arch bridge is established by using finite element analysis software Midas civil.According to the characteristics of the bridge structure and the calculation of the internal force, the loading condition of the static load test, the loading and unloading process and the order of magnitude of the loading and unloading under each working condition, as well as the arrangement of the measuring points in the main control section and the section are determined.The actual strain and deflection of the bridge measured in the static load test in the control section are analyzed and compared with the theoretical values of the calculation model, and combined with the latest technical status of the highway bridge issued by the Ministry of Communications and Transport in 2011 and the evaluation standard for the bearing capacity.Determine the actual bearing capacity of the bridge to meet the normal traffic requirements.The theoretical modal analysis of the bridge is carried out by using the finite element software, and the theoretical natural vibration frequency and vibration mode of the bridge are calculated. It is concluded that the in-plane stiffness of the bridge is greater than that of the out-of-plane stiffness, which accords with the vibration pattern of the concrete-filled steel tube arch bridge.The measured value is close to the theoretical value through the dynamic load test, and the measured value is larger than the theoretical value, which shows that the whole structure has a good force.The dynamic load test detects the strain increasing coefficient and natural vibration frequency of the bridge by pulsating test and driving test, and obtains that the strain increase coefficient is basically within a reasonable range.Through the test and analysis of static load and dynamic load test, it can be concluded that the bearing capacity of the main bridge and the approach bridge can meet the design requirements and meet the requirements of normal traffic.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U446;U448.22

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