大跨钢桁梁桥顶推施工过程受力分析及控制技术研究

发布时间：2018-01-27 01:44

本文关键词： 大跨度钢桁梁桥应力分析施工监控　出处：《兰州交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：大跨度钢结构桥梁的施工方法有多种形式,应根据桥梁的结构形式、跨度大小、施工环境等因素综合选择合适的方法,以达到施工方便、降低造价、减少工期、安全可靠等综合经济效益良好的目的,其中顶推法施工具有不影响桥位处交通状况、少施工设备、有利于生产组织、安全可靠和缩短施工工期等优点成为大跨度钢结构桥梁常用的施工方法之一。其中大型钢桁梁桥结构以其受力好、质量轻,满足较高强度和刚度要求等优点,成为跨越河流、深沟峡谷的理想桥型。但在顶推施工过程中主梁的受力远较采用其他常规的施工方法复杂,有必要对施工过程进行准确的模拟。本文以黄韩侯铁路156m钢桁梁桥为背景,对该桥顶推法施工过程的应力及变形的监控工作进行研究。采用了有限元软件MIDAS建立全桥实体模型,分析钢桁梁桥顶推施工的全过程,对钢桁梁桥在顶推施工过程的受力与变形进行仿真模拟计算分析,为类似工程建设提供一定的参考。为了确保桥梁的施工安全以及保证大跨钢桁梁桥梁线型和应力满足设计要求,根据施工控制和实际施工的需要对钢桁梁桥顶推施工控制的技术进行研究。文中介绍了顶推施工发展状况,并对钢桁梁桥梁的施工监控理论方法以及目的和原则进行了简要的阐述。然后通过使用MIDAS有限元分析软件对桥梁顶推施工过程各阶段的应力和变形状态进行了数值分析。有限元分析的主要内容包括桥梁主梁、桁架的应力和线型变化规律。同时采用应力传感器对桥梁顶推施工过程进行了应力测量。通过对MIDAS计算结果和实测值的分析比较,二者数据基本保持一致。在实际施工过程中,施工控制人员通过计算结果和实际测量值之间的比较,能够及时发现问题,为下一阶段的安全施工提供可行的意见,达到了施工监控的目的,从而保障了该大跨度桥梁的安全施工。
[Abstract]:There are many kinds of construction methods for long-span steel bridges. According to the structural form, span size, construction environment and other factors, the appropriate method should be comprehensively selected, in order to achieve the convenience of construction, reduce the cost and reduce the duration of the project. The safety and reliability of the purpose of comprehensive economic benefits such as good, one of the thrust method construction has no impact on the traffic situation at the bridge, less construction equipment, is conducive to production organization. The advantages of safety and reliability and shortening the construction period have become one of the commonly used construction methods of long-span steel bridge, among which the large steel truss bridge structure has the advantages of good force, light weight, high strength and stiffness requirements, and so on. It is an ideal bridge type to cross rivers and deep gully canyons, but the force of the main beam in the process of pushing construction is much more complicated than that of other conventional construction methods, so it is necessary to simulate the construction process accurately. Based on the 156m steel truss bridge of Huanghanhou railway, this paper studies the monitoring of stress and deformation during the construction process of the bridge by pushing method. The finite element software MIDAS is used to establish the solid model of the whole bridge. The whole process of jacking construction of steel truss bridge is analyzed, and the force and deformation of steel truss bridge in the process of jacking construction are simulated and calculated. In order to ensure the safety of the bridge construction and ensure that the long span steel truss bridge line and stress meet the design requirements. According to the need of construction control and actual construction, the construction control technology of steel truss bridge is studied. In this paper, the development of pushing construction is introduced. The construction monitoring theory method, purpose and principle of steel truss bridge are briefly expounded. Then, the stress and deformation state of each stage of bridge jacking construction is analyzed by using MIDAS finite element analysis software. The main contents of the finite element analysis include the main beam of the bridge. At the same time, stress sensor is used to measure the stress of the bridge jacking construction process. Through the analysis and comparison of the MIDAS calculation results and the measured values. In the actual construction process, the construction controller can find the problem in time by comparing the calculated results with the actual measured values. It provides feasible opinions for the next stage of safe construction, achieves the purpose of construction monitoring, and thus ensures the safe construction of the long-span bridge.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.462

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