钢桁梁整体式多点连续顶推施工监控研究-工程专业论文.docxVIP

摘要摘要 摘要 摘要 青尼罗河大桥位于埃塞俄比亚西部的贝尼尚古尔．古穆兹区 (Benishangul—Gumuz)，横跨青尼罗河(Blue Nile River)，是连接阿索萨(Assosa) 和古巴(Guba)的公路桥梁。青尼罗河大桥的建成，极大地改善了当地的交通 现状，具有重要的社会意义。 本文以青尼罗河大桥主体钢桥施工为工程背景，采用大型空间有限元分析 计算软件，对主桥钢桁梁顶推施工全过程中钢桁梁、永久墩、临时墩及其他临 时结构进行仿真模拟计算，展开受力分析，得出施工过程中监控所需的数据和 参数来指导施工。在钢桁梁主梁顶推过程中，采用HY65数码应变监控系统、全 站仪、经纬仪、精密水准仪等设备对钢桁梁的应力、挠度及轴线偏位，永久墩 及临时墩的纵向偏移量等重要施工参数进行了实时监控。根据监控所得的数据 修正完善结构计算模型中的相关参数，并进行施工过程中的监控复核计算，反 馈指导施工监控工作。本文所涵盖的主要工作内容为： 1．采用大型空间有限元分析计算软件对该桥进行施工过程建模研究：钢桁梁 杆件采用框架梁单元模拟，对钢桁梁的自重进行修正，使理论计算荷载与实际 荷载一致。采用有限元方法模拟施工全过程，对顶推过程中可能出现的危险工 况进行详细分析。 2．根据顶推施工的计算结果，采用数码应变计、全站仪和精密水准仪等设 备对施工过程中结构的应变、位移、轴线偏移和温度等参数进行现场的实时跟 踪测量。 3．分析各施工阶段中主梁内力和变形与理论计算值的差异并找出原因，提出 修正对策。 关键词：钢桁梁；顶推法施工；整体式多点连续项推；施工验算；施工监控 摘要Abstract 摘要 Abstract Blue Nile River Bridge iS located in Benishangul—Gumuz District of western Ethiopia．and cross．over Blue Nile River,it’S a highway bridge 1inks Assosa and Guba．After the completion of Blue Nile River Bridge，the local transportation conditions will be greatly improved，and it has very important social significance． Taking the construction of steel truss of Blue Nile River Bridge as its engineering background，this thesis uses large space finite element software to build the model and calculate the steel truss，permanent pier,temporary pier and other temporary structures during launching process，after stress analysis，we get the dates and parameters for construction monitoring and guiding the construction．During the launching process of steel truss，use HY65 digital strain monitoring system，total station，transit instrument，precision level instrument and other instruments to observe the important construction parameters such as strains，displacements，and axis deviations of steel truss，and longitudinal displacements of permanent piers and temporary piers．According to the monitoring dates to correct the relational parajc：i；．，ters of structure computation model，and carry out the monitoring recheck results during the launching process to guide the construction monitoring．The major