钢筋混凝土异型拱桥施工监测.doc

钢筋混凝土异型拱桥线形监控及研究 摘 要 随着生产力的发展，进几年来人们对桥梁建筑的结构合理性与美观性的要求也愈来愈高。桥梁不再是单纯的交通工程实体，而是作为一种空间艺术结构物存于社会生活之中。异型拱桥作为一种新兴桥型，它不但满足视觉美观的要求，还很好的继承系杆拱的结构最优要求，但是它在施工过程中，因异型拱桥的纵、横向刚度相对较小，基稳定性控制就成同该类桥的线形控制和内力控制等重要结构问题一样被摆到了非常重要的位置。本文以倒水坳大桥扩建异型拱桥施工过程为工程背景，首先简要介绍了该桥的工程概况和施工技术，然后再应用Midas/civil限元软件对拱桥施工阶段中结构的变形、应力和稳定性进行了仿真分析与研究工作，同时在这基础上制定了对施工监控方案，最后并对该拱桥的监测数据进行了整理和误差分析，最终分析结果是倒水坳大桥施工取得较好的结果。具体研究内容如下： （1）应用通用桥梁有限元软件Midas/civil建立成桥各施工阶段三维有限元模型，在考虑温度升降、混凝土时间效应和收缩徐变等因素的影响基础上按照施工顺序对拱肋施工阶段进行非线性模拟计算，得出合理的结果，为大桥的施工控制提供了可靠的理论数据。 （2）通过对实测线形数据和应力数据的整理与有限元软件计算的数据进行综合分析，再反复重新建立模型使的更好接近结构实际受力状态，从而为结构的线形和应力分析、施工方案变更和施工质量评价提供了依据。 （3）分别运用简化的稳定性公式计算和有限元软件Midas/civil计算在各施工阶段拱肋的稳定性，而且研究了影响桥梁结构稳定性系数的结构参数，最后还计算了成桥后运营阶段不同的移动荷载组合布置下的稳定分析。 关键词：异型拱桥 施工监控 有限元分析 稳定性研究 REINFORCED CONCRETE ARCH BRIDGE SECTION LINEA MONITORING AND RESEARCH ABSTRACT With the development of productive forces, in a few years to people to bridge construction structure rationality and the requirements of the beautiful sex is higher and higher also. The bridge is no longer simple traffic engineering entity, but as a kind of spatial art structure exist in social life of. Special arch bridge as a new bridge type, it not only meet the requirements of the visual appearance, but also very good inheritance bowstring arch bridge structure optimal request, but it in construction process, because of the special arch bridge in the longitudinal and lateral stiffness is relatively small, base stability control become the bridge with linear control and internal control as an important structure was placed in a very important position. This paper to Dao shui ao of bridge expansion deformed arch bridge construction process for the engineering background, this paper at first introduced the general situation of the engineering and construction technology, and then application Midas/civil finite element software to arch bridge construction stage structure of the deformation, stress and stability simulation analysis and research work, and at