云南现役大跨度连续刚构桥跨中下挠分析及工程应用措施研究

发布时间：2018-05-29 00:57

本文选题：云南 + 大跨度连续刚构桥　；参考：《昆明理工大学》2014年硕士论文

【摘要】：云南地处高原多山区,大跨连续刚构桥在各等级公路中都极其常见,并且其中很多在运营初期便出现了较严重的病害,尤其是跨中下挠问题,因此对大跨连续刚构桥进行跨中下挠的成因及对策进行针对性分析研究是非常有现实意义的。本文集中调研了元磨高速K209+499.6红河大桥、K288+642阿墨江大桥等6座大跨连续刚构桥的运营现状,以目前国内最大跨径的不等跨连续刚构桥红河大桥(58m+182m+265m+194m+70m)为研究对象建立有限元模型分析下挠的成因并与实测值进行对比,提出刚构桥跨中下挠问题的工程应对措施并以下挠较为严重的K288+642阿墨江大桥(70m+2×130m+70m)为研究对象进行加固效果对比分析,具体进行了如下工作：首先,详细调研得到云南六座典型预应力混凝土连续刚构桥的病害情况,总结了连续刚构桥病害特别是跨中下挠的一些普遍分布规律并对箱梁开裂及下挠等主要病害进行了初步分析。其次,概述了大跨度连续刚构桥跨中长期下挠后的结构受力特征、预应力损失的计算方法及预应力产生的变形计算、混凝土收缩徐变理论及超静定结构引起的徐变变形计算、箱梁开裂后的结构承载力评估与计算。再次,分析了施工过程中施工管理、控制参数对大跨度连续刚构桥中长期下挠的影响,并以云南元磨高速K209+499.6红河大桥为研究对象,建立空间有限元模型,重点分析了预应力损失、混凝土收缩徐变及箱梁开裂对大跨度连续刚构跨中长期下挠的影响并与监测数据对比分析。最后,提出了减缓大跨度连续刚构桥中长期下挠在设计、施工、营运、现役阶段的对策措施及工程方案,并以云南元磨高速K288+642阿墨江大桥为例,详细制定了以增设体外预应力钢束为主的工程处治措施,并对处治后的整体结构进行了空间建模对比分析和演算,同时运用Midas FEA细部分析有限元软件和预应力等效荷载法建立实体模型对新增转向块、进行局部应力分析以检验处治措施的可靠性,为其他工程应用提供实用可行的借鉴经验。
[Abstract]:Yunnan is located in mountainous areas of plateau, long span continuous rigid frame bridges are very common in all kinds of highways, and many of them have serious diseases in the early stage of operation, especially the problem of mid-span deflection. Therefore, it is of great practical significance to analyze the causes and countermeasures of long-span continuous rigid frame bridge. This paper focuses on the present operation situation of six long-span continuous rigid frame bridges, such as Yuanmo High-Speed K209 499.6 Honghe Bridge, K288642 Amo River Bridge, etc. Taking Honghe Bridge, a continuous rigid frame bridge with the largest span in China at present, as the object of study, the finite element model is established to analyze the cause of the deflection and to compare the measured value with the measured value. This paper puts forward the engineering countermeasures for the problem of deflection in the span of rigid frame bridge and compares the reinforcement effect of K288,642 Amo River Bridge (70m2 脳 130m 70m) with that of K288642. The concrete work is as follows: First of all, the disease of six typical prestressed concrete continuous rigid frame bridges in Yunnan is investigated in detail. This paper summarizes some general distribution laws of continuous rigid frame bridge diseases, especially mid-span deflection, and makes a preliminary analysis of the main diseases such as box girder cracking and deflection. Secondly, the stress characteristics of long-span continuous rigid frame bridge after long-span deflection, the calculation method of prestress loss and deformation caused by prestress, the theory of shrinkage and creep of concrete and the calculation of creep caused by statically indeterminate structure are summarized. Evaluation and calculation of structural bearing capacity after box girder cracking. Thirdly, the influence of construction management and control parameters on long-span continuous rigid frame bridge is analyzed, and the spatial finite element model of Yunnan Yuanmo High-speed K209 499.6 Honghe Bridge is established. The effects of prestressing loss, shrinkage and creep of concrete and cracking of box girder on long term deflection of long span continuous rigid frame span are analyzed and compared with monitoring data. Finally, the paper puts forward the countermeasures and engineering schemes to slow down the long-span continuous rigid frame bridge in the design, construction, operation and active stage, and takes the Yunnan-Yuanmo high-speed K288-642 Amo River Bridge as an example. The engineering treatment measures with the addition of external prestressed steel beam are formulated in detail, and the spatial modeling, contrast analysis and calculation of the whole structure after treatment are carried out. At the same time, the finite element analysis software of Midas FEA and the equivalent load method of prestress are used to establish the solid model to analyze the local stress of the new steering block to test the reliability of the treatment measures, and to provide practical and feasible experience for other engineering applications.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.23

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