双排支座先简支后连续PC箱梁桥病害分析及加固方法

发布时间：2018-02-21 12:17

本文关键词： 双排支座简支变连续箱梁病害加固　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：简支转连续箱梁桥在公路建设工程中得到了广泛的应用，随着时间的推移，受气候、环境因素的影响，结构材料逐渐老化、劣化，导致材料性能变差，而设计、施工质量的缺陷和车辆超载等因素，更使得建成后的许多桥梁出现损伤病害，导致结构承载能力降低、耐久性缺失，，有的已严重影响到桥梁的使用安全。本文在总结目前国内关于简支转连续桥构造形式、常见病害和加固方法的基础上，以重载交通下的双排座普通钢筋形式连续的某5×20m简支转连续梁桥为工程背景，对实桥病害进行了调研，采用杆系有限元对原设计状况和当前状况进行了分析验算，同时针对这两种状况考虑简支转连续施工阶段利用ABAQUS实体单元仿真分析，分析该种构造形式下成桥状态薄弱部位和裂缝开展区域以研究实桥裂缝成因，并与实桥检测结果进行了对比分析，分析了墩顶双排支座普通钢筋连续、双排支座预应力连续和单排支座预应力连续构造形式下的结构受力，进一步探讨了支点处双排支座简支转连续梁桥的加固方法。最后，通过依托工程桥梁实际应用对比加固前、后的静载试验结果，评价加固后的桥梁承载力。本文研究成果已成功地运用于依托工程，实际工程应用结果表明:本文研究方法对于该类桥梁具有指导性作用。
[Abstract]:Simply supported continuous box girder bridges have been widely used in highway construction projects. With the passage of time, due to the influence of climate and environmental factors, the structural materials are gradually aging and deteriorating, which leads to the deterioration of material performance. The defects of construction quality and overloading of vehicles make many bridges appear damage and disease, which lead to the decrease of the bearing capacity of the structure and the lack of durability, some of which have seriously affected the safety of the use of the bridges. On the basis of summing up the construction form, common diseases and reinforcement methods of the simple supported continuous bridge in China, this paper takes a 5 脳 20m continuous beam bridge with two rows of ordinary steel bars under heavy load traffic as the engineering background. The disease of real bridge is investigated, and the original design condition and current condition are analyzed and checked by using the finite element method of the bar system. At the same time, in view of these two conditions, the ABAQUS entity element is used to simulate and analyze the continuous construction stage of the simply supported bridge. In order to study the causes of the cracks in the bridge, the weak part of the bridge and the crack developing area under this structural form are analyzed, and compared with the test results of the real bridge, the continuity of the common steel bars on the double row supports at the top of the pier is analyzed. In this paper, the reinforcement method of double row support simply supported continuous beam bridge is further discussed in the form of prestressed continuous structure of double row support and single row support of prestressed continuous structure. Finally, the actual application of the bridge is compared and strengthened by relying on the engineering bridge. The results of static load test are used to evaluate the bearing capacity of the strengthened bridge. The research results of this paper have been successfully applied to the supporting engineering, and the practical engineering application results show that the research method in this paper is instructive for this kind of bridge.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.213;U445.7

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