预应力混凝土连续刚构桥施工控制.pdfVIP

摘 要 随着悬臂浇筑施工技术的不断发展，预应力混凝土连续刚构桥得到了空前发展。预 应力混凝土连续刚构桥在悬臂施工过程中，受到各种不确定的因素影响，导致结构的内 力和变形发生变化，因此，为确保桥梁结构合拢精度和成桥线形能达到设计要求的标 高，施工监控工作就显得相当重要。 本文以广东省东莞市麻涌二桥为工程背景，对影响其内力和变形的各种因素进行研 究，并采用有限元软件 BSAS 建立梁单元模型，结合施工监控方案对全桥施工过程进行 仿真分析，计算各施工阶段结构的内力和变形，提取恒载挠度和活载挠度，为现场施工 提供悬臂浇筑预拱度。麻涌二桥施工监控时采用线形、应力双控的控制方法，依据施工 监测方案对各个施工节段（如挂篮前移、浇筑混凝土、张拉预应力钢束）的标高、应力 进行实际测量，将实测结果与理论计算值进行对比分析，分析误差产生的原因并及时调 整下一节段的预拱度值。 麻涌二桥的施工控制结果分析，为现场施工监控工作提供了有利的数据依据，确保 了施工的顺利进行，最终主桥顺利合拢，主梁线形、应力均达到控制目标，结构安全可 靠。本文采用的施工监测方法对同类桥型的施工监测具有一定的参考价值 关键词：施工管理；桥梁施工；预拱度；线形；参数 I Abstract With the development of the cantilever construction technology, prestressed concrete continuous girder bridge has got unprecedented development. In the process of cantilever construction, prestressed concrete continuous girder bridge was under the influence of all kinds of uncertain factors so that to lead to changes of internal force and deformation of the structure. So in order to ensure the precision of bridge structure fold and bridge can reach the requirements of the design of the linear elevation, construction monitoring work is quite important. In this paper, in the engineering background of Ma Chong second Bridge, the influence of internal force and deformation of all kinds of factors was researched. The finite element software BSAS was used to establish beam element model, based on the construction control scheme to carry on simulation analysis of the whole bridge construction process,caculating the structure internal force and deformation at every construction stage,extracting the dead load deflection and live load deflection to provide pre-camber for cantilever casting construction.Construction monitoring of Ma Chong second Bridge takes