基于材料时变特性的悬臂梁桥控制

发布时间：2018-01-19 23:08

本文关键词： 连续梁桥悬臂施工时变特性预测施工控制　出处：《华北水利水电大学》2015年硕士论文　论文类型：学位论文

【摘要】：预应力混凝土连续梁桥在各类型的桥梁结构中有其独特的自身优势,伴随我国今些年公路交通的快速发展,其被广泛应用迎来了快速发展的新时代,各地预应力混凝土连续梁桥如雨后春笋般层出不穷。目前,简支变连续法、顶推法、悬臂浇筑法和悬臂拼装法是预应力混凝土连续梁桥的主要施工方法,其中悬臂浇筑法和悬臂拼装法应用最广泛。采用悬臂工法施工时,为了确保桥梁结构的成桥线形和合拢精度满足要求以及桥梁在运营多年后能达到预期的设计标高,必须要进行悬臂施工监控,而对材料的时间变化特性的把握是悬臂施工监控成败的关键,但经作者研究发现我国现行的桥梁设计软件中对于砼材料的强度和弹性模量时变特性的考虑一般采用的是现行的美国规范(ACI)或欧洲规范(CEB-FIP),针对我国自己的材料时变规范目前还没有,这就使得我国悬臂施工监控缺乏有力的理论基础。针对此现象本文在分析总结国内外预应力混凝土连续梁桥发展和施工控制技术发展现状的基础上,以河南省焦作市“沁河大桥”为工程背景,对大跨度预应力混凝土连续梁桥的施工控制技术进行了研究,通过采用有限元软件Midas/Civil在充分考虑材料的时变特性的基础上,依据预应力混凝土连续梁桥的施工控制的特点,建立桥梁计算模型,对整个施工过程进行仿真分析,同时结合大桥监控实践,制定了沁河大桥监控方案和具体的监控控制措施;并依托沁河大桥(35+7*60+35)m连续梁桥对比现设计常用的美国规范和欧洲规范及考虑材料真实时变特性三种方法在悬臂施工监控中的预测结果与真实施工实测结果的吻合度,证实了基于材料时变特性的悬臂梁桥施工监控的控制效果良好,提出了对于预应力混凝土连续梁桥施工监控的新方法,丰富了我国桥梁施工监控技术,本次的研究工作可作为今后同类桥梁施工监控的参考。
[Abstract]:Prestressed concrete continuous beam bridge has its own unique advantages in various types of bridge structure. With the rapid development of highway traffic in China, it has been widely used in a new era of rapid development. Prestressed concrete continuous beam bridges are springing up all over the place. At present, simple support method, jacking method, cantilever pouring method and cantilever assembly method are the main construction methods of prestressed concrete continuous beam bridge. The cantilever casting method and cantilever assembly method are most widely used. In order to ensure that the bridge alignment and closure accuracy meet the requirements and that the bridge can reach the expected design elevation after many years of operation, it is necessary to carry out cantilever construction monitoring. The key to the success or failure of cantilever construction monitoring is to grasp the time variation characteristics of the material. However, through the author's research, it is found that in the current bridge design software in China, the time-varying properties of strength and elastic modulus of concrete materials are generally considered in the current American Code (ACI) or the European Code (. CEB-FIP). At present, there are no time-varying specifications for our own materials. This makes the cantilever construction monitoring lack of a strong theoretical basis. In view of this phenomenon, this paper analyzes and summarizes the development of prestressed concrete continuous beam bridge and construction control technology development status quo at home and abroad. Based on "Qinhe Bridge" in Jiaozuo City, Henan Province, the construction control technology of long-span prestressed concrete continuous beam bridge is studied. Based on the time-varying characteristics of materials and the characteristics of construction control of prestressed concrete continuous beam bridge, the bridge calculation model is established by using finite element software Midas/Civil. The whole construction process is simulated and analyzed. At the same time, combined with the bridge monitoring practice, Qinhe Bridge monitoring scheme and specific monitoring and control measures are formulated. And relying on the Qinhe River Bridge. M continuous beam bridges are compared with the three methods commonly used in the design of American code and European code and considering the real time-varying characteristics of materials in the cantilever construction monitoring. The prediction results are consistent with the actual construction results. It is proved that the control effect of cantilever beam bridge construction monitoring based on material time-varying characteristics is good, and a new method for construction monitoring of prestressed concrete continuous beam bridge is put forward, which enriches the bridge construction monitoring technology in China. This research work can be used as a reference for similar bridge construction monitoring in the future.
【学位授予单位】：华北水利水电大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4

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