大跨度连续刚构桥施工控制关键技术研究

发布时间：2018-01-15 10:24

本文关键词：大跨度连续刚构桥施工控制关键技术研究　出处：《重庆交通大学》2015年硕士论文　论文类型：学位论文

更多相关文章： 连续刚构桥 施工控制 线形应力 Midas

【摘要】：经济、技术、工程材料等的大力发展,使得桥梁结构向大跨度、新形式方向发展,桥梁工程建设大规模化,其中大跨度连续刚构桥因结构形式简单、施工技术成熟等各种优点被广泛使用,目前多采用悬臂施工方法施工,但是经实际调查研究发现,我国八九十年代修建的此类桥梁出现腹板斜裂缝等问题,在当下悬臂施工过程中也有出现开裂或下挠过大等问题,且当下对桥梁使用荷载、耐久性等提出了更高使用要求,桥梁施工控制是确保连续刚构桥梁在修建于使用运营过程中的安全性的重要措施。本文以大跨度连续刚构桥为依托工程,首先利用有限元软件Midas Civil对大桥进行仿真模拟计算,通过模拟该桥实际施工过程,分析桥梁的内力、应力及变形,进而指导桥梁施工控制,研究内容与研究结果为:(1)首先阐述连续刚构桥桥型受力特点及结构优势,指出悬臂施工方法在连续刚构桥中的运用,总结国内外连续刚构桥施工控制发展现状及趋势;(2)其次介绍连续刚构桥施工控制的有限元分析理论及分析方法,主要介绍正装计算法和倒装计算法的基本理论;(3)然后以大跨度连续刚构桥为依托,采用Midas Civil建立有限元模型,按照桥梁实际施工方法、顺序进行模拟分析,并考虑因施工进度导致的不同时效影响;(4)接着以有限元模型为基础,对悬臂施工阶段过程中主梁线形、应力控制、桥墩偏位,拟定桥梁预拱度、支座预偏量等施工方案;(5)最后分析桥墩刚度、温度、预应力等因素对桥梁合龙的影响,拟定合龙方案。
[Abstract]:With the development of economy, technology, engineering materials and so on, the bridge structure develops to the direction of long span and new form, and the large-scale construction of bridge engineering, in which the long-span continuous rigid frame bridge is simple because of its structural form. The mature construction technology and other advantages are widely used. At present, most of them are constructed by cantilever construction method. However, through the actual investigation and research, it is found that the bridge built in the 1980s and 1990s in China has problems such as web slanting cracks and so on. In the current cantilever construction process there are also problems such as cracking or excessive deflection, and the current use of the bridge load, durability and other put forward a higher use requirements. Bridge construction control is an important measure to ensure the safety of continuous rigid frame bridge. Firstly, the finite element software Midas Civil is used to simulate and calculate the bridge. By simulating the actual construction process of the bridge, the internal force, stress and deformation of the bridge are analyzed, and then the bridge construction control is guided. The content and the result of the study are: (1) firstly, the stress characteristics and structural advantages of continuous rigid frame bridge are expounded, and the application of cantilever construction method in continuous rigid frame bridge is pointed out. The present situation and trend of construction control of continuous rigid frame bridges at home and abroad are summarized. Secondly, the theory and method of finite element analysis for construction control of continuous rigid frame bridge are introduced. Then, based on the long-span continuous rigid frame bridge, the finite element model is established by using Midas Civil, and the simulation analysis is carried out according to the actual construction method of the bridge. Considering the effect of different time due to construction schedule; Secondly, based on the finite element model, the main beam alignment, stress control, pier deflection, bridge pre-arch and support pre-deflection are worked out in the construction stage of cantilever. Finally, the influences of pier stiffness, temperature and prestress on bridge closure are analyzed.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4

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