有黏结预应力加固体系在预应力混凝土连续箱梁桥中的应用研究

发布时间：2018-05-16 17:50

本文选题：有黏结预应力加固体系 + 连续箱梁桥　；参考：《重庆交通大学》2015年硕士论文

【摘要】：随着我国经济的不断繁荣,交通量与日俱增,车辆载重也不断提升,对桥梁的要求也越来越高。但根据相关统计资料显示,全国的病危桥梁数量众多,而重新修建这些桥梁显然是不可能的,因此需要适当的加固措施对其进行维修,确保公路交通的顺畅。预应力混凝土连续梁桥是一种非常重要的桥梁形式,而这一类型桥梁的病害也是相当严重的,故选择合适的加固维修方式是也一项重要的研究内容。文中从预应力混凝土连续梁桥的常见损伤着手,分析了其主要病害的表现形式以及常用的加固方法,并分析了各种方法的利弊。有黏结预应力加固体系是一种全新的结构构思,使用了新材料镀锌软钢丝束及HTCM高性能抗拉复合砂浆或AP多功能复合树脂砂浆,并以其预应力筋锚固工艺简单、张拉施工方便、结构耐久性高和加固效果明显的综合技术优势,受到国内外土木工程界的重视。为了研究该加固技术在预应力混凝土连续箱梁桥中的应用,文中主要通过以下几方面进行展开。①介绍有黏结预应力加固体系的基本理论,包括对该体系的具体使用阐述、体系常用的材料说明以及体系的基本加固原理,其中的加固原理主要是对受弯构件的正截面、斜截面承载力的验算方法。②结合工程实例百丈大桥主桥的桥梁检测报告,采用桥梁有限元专用软件Midas Civil对其进行仿真模拟,评估了该桥现阶段的承载力状态,发现斜截面的抗剪承载能力不足,而且中跨距墩1/4L处区段的腹板位置主拉应力大于规范要求,故需要对百丈大桥主桥进行斜截面加固。③对多种加固方案进行评选,最终选择利用有黏结预应力加固体系对百丈大桥主桥进行斜截面加固,并通过Midas Civil进行加固模拟。将得出的加固后分析结果与加固前模型对比,发现加固后的斜截面抗剪承载能力有了比较明显的提升,不满足规范要求的腹板位置主拉应力也绝大部分满足了加固目标,达到了加固补强的目的。除此之外,还对体系中可能影响加固效果的因素分别进行了讨论,如选用的高性能抗拉复合砂浆类型、腹板尺寸的改变大小等。通过以上几方面有黏结预应力加固体系在预应力混凝土连续箱梁桥中的应用研究,望对相同类型桥梁应用该体系的加固提供一定的指导参考。
[Abstract]:With the economic prosperity of our country, traffic volume is increasing day by day, the vehicle load is also increasing, and the requirement of bridge is becoming higher and higher. However, according to the relevant statistics, there are a large number of critical bridges in China, and it is obviously impossible to rebuild these bridges. Therefore, appropriate reinforcement measures are needed to maintain them to ensure smooth road traffic. Prestressed concrete continuous beam bridge is a very important bridge form, and the disease of this type of bridge is quite serious, so it is also an important research content to choose the appropriate reinforcement and maintenance method. Starting from the common damage of prestressed concrete continuous beam bridge, this paper analyzes the main disease forms and common reinforcement methods, and analyzes the advantages and disadvantages of various methods. The reinforced system with bonded prestressing force is a new kind of structure conception. The new material galvanized mild steel wire bundle and HTCM high performance tensile composite mortar or AP multifunctional composite resin mortar are used. The anchoring technology of prestressing tendons is simple and the tension construction is convenient. The comprehensive technical advantages of high durability and obvious reinforcement effect have been attached great importance to by the civil engineering circles at home and abroad. In order to study the application of this reinforcement technology in prestressed concrete continuous box girder bridge, this paper mainly introduces the basic theory of bonded prestressed reinforcement system by following aspects, including the concrete application of the system. The common material description of the system and the basic reinforcement principle of the system, in which the reinforcement principle is mainly the checking calculation method of the normal section and the bearing capacity of the inclined section of the flexural member. 2. Combined with the bridge inspection report of the main bridge of the Baizhang Bridge in the engineering example, The finite element software Midas Civil is used to simulate the bridge, and the bearing capacity of the bridge is evaluated at the present stage. It is found that the shear bearing capacity of the inclined section is insufficient. Moreover, the main tensile stress of the web in the 1 / 4L section of the mid-span pier is greater than that required by the code, so it is necessary to select various reinforcement schemes for the main bridge of Baizhang Bridge by strengthening it with oblique section. Finally, the reinforced main bridge of Baizhang Bridge is reinforced with bonded prestressed reinforcement system, and the reinforcement simulation is carried out by Midas Civil. By comparing the results obtained with the model before reinforcement, it is found that the shear bearing capacity of the reinforced oblique section has been obviously enhanced, and the main tensile stress of the web position which does not meet the requirements of the code is mostly satisfied with the reinforcement goal. The purpose of strengthening and strengthening has been achieved. In addition, the factors which may affect the reinforcement effect are discussed, such as the type of high performance tensile composite mortar, the change of web size and so on. Through the research on the application of bonded prestressed reinforcement system in prestressed concrete continuous box girder bridge, this paper hopes to provide some guidance for the reinforcement of the same type of bridge.
【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】：U445.72

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