装配式改整体式空心板桥纵向裂缝机理及加固措施研究

发布时间：2018-01-24 01:42

本文关键词： 装配式空心板桥整体式空心板桥荷载横向分布纵向裂缝体外预应力粘帖钢板　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：将原设计为装配式的空心板桥改为整体现浇施工，板的受力状况由单向受力改为双向受力。改变施工方法却仍按最初设计配置横向钢筋的空心板桥，经常在跨中附近出现超出规范限定的纵向裂缝，有的甚至贯穿整跨。本文以典型的装配式和整体式空心板桥为研究对象，针对此类病害，开展了纵向裂缝的机理研究，并提出了施加体外横向预应力和粘帖横向钢板两种加固方法。主要研究内容如下： 1、基于铰接板理论和刚接板理论，分别探讨了装配式空心板桥和整体式空心板桥的荷载横向分布；利用有限元分析软件ANSYS分别建立了预制装配式空心板桥和整体现浇式空心板桥的实体模型。 2、针对所建空心板桥的实体模型，分别考虑两种不同的施工方法，对空心板桥在自重、车辆荷载和温度荷载作用下的受力状况进行分析，，并重点对整体式空心板桥在荷载作用下的内力分布进行了研究，得出了空心板桥的纵向裂缝机理，并对今后的空心板桥施工提出了一些建议。 3、参考旧桥的加固实例，结合以往的工程经验，提出了施加横向预应力和粘帖横向钢板两种加固方法，并建立有限元模型，对两种加固方法进行了参数分析；通过对比分析加固前后空心板桥受力状况，验证了两种加固方法的效果。
[Abstract]:The original design of the hollow slab bridge is changed into integral cast-in-place construction. The stress condition of the slab is changed from unidirectional to bidirectional. The construction method is changed but the hollow slab bridge with transverse reinforcement is still arranged according to the original design. There are often longitudinal cracks near the middle of the span, some of which even run through the whole span. This paper takes the typical assembly and integral hollow slab bridge as the research object, aiming at this kind of disease. In this paper, the mechanism of longitudinal cracks is studied, and two reinforcement methods, external transverse prestress and adhesive transverse steel plate, are proposed. The main contents are as follows: 1. Based on the theory of hinged plate and rigid plate, the transverse distribution of load of fabricated hollow slab bridge and integral hollow slab bridge is discussed respectively. The solid models of prefabricated hollow slab bridge and integral cast-in-place hollow slab bridge were established by using finite element analysis software ANSYS. 2. According to the solid model of the hollow slab bridge, two different construction methods are considered to analyze the stress condition of the hollow slab bridge under the action of deadweight, vehicle load and temperature load. The internal force distribution of integral hollow slab bridge under load is studied emphatically, the longitudinal crack mechanism of hollow slab bridge is obtained, and some suggestions are put forward for the construction of hollow slab bridge in the future. 3. Referring to the example of the old bridge, combined with the past engineering experience, this paper puts forward two strengthening methods of applying transverse prestressing force and sticking the transverse steel plate, and establishes the finite element model. The parameters of the two reinforcement methods are analyzed. The effect of the two reinforcement methods is verified by comparing and analyzing the stress state of the hollow slab bridge before and after reinforcement.
【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】：U445.7

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