“托梁换柱”结构改造技术的研究

发布时间：2018-01-31 18:56

本文关键词： 托梁换柱加固改造加固方案优化设计经济指标关键因素　出处：《南昌大学》2014年硕士论文　论文类型：学位论文

【摘要】：混凝土结构加固改造技术发展至今，已有三四十年的历史，现已形成一套专业的加固方法。采用托换技术进行房屋结构加固改造，只需要拆除部分柱、承重墙，在加固改造期间，对其他构件影响较小，基本不影响房屋的正常使用及生产生活。在工程实践中，常见的加固方法包括增大截面加固法，外粘型钢加固法，粘贴钢板加固法，粘贴纤维复合材加固法，外加预应力加固法等方法。本文重点针对以上几种方法在“托梁换柱”结构改造技术中的应用进行探讨，并在此基础上探索研究了一种新的桁架式加固形式。本文结合某五层框架结构“托梁换柱”结构改造工程进行了研究，提出了局部托换的加固设计方法和思路。首先，简要概述了工程背景、加固改造范围及内容，相关理论分析依据及基本条件，采用PKPM结构系列软件建模，对改造前和模拟改造后的工程结构进行整体内力计算，分析托换构件的受力情况和承载力水平，确定对周边其他构件是否产生影响、影响程度及影响是否可以忽略。其次，对传统的加固方案截面承载力计算方法和新设计的加固方法进行介绍，对改造引起的需要加固的构件进行加固方案的优化设计，进行强度校核。再次，通过ABAQUS有限元分析软件对各种加固方案进行局部受力分析，对需要加固构件的变形进行计算和对比。综合比较各种方案的技术可行性、经济性指标及各种方案的施工可行性，总结了各种托换加固改造方法的特点及适用范围。最后，选择出适用于本工程的局部托换改造方法——粘贴钢板加固法。针对粘贴钢板加固法中影响粘接效果的关键因素如粘结胶的刚度和厚度、钢板的厚度进行了局部有限元分析。粘结胶的厚度对粘贴钢板加固法的加固效果有很大的影响，本文建议粘结胶的厚度取2～3mm，，建议粘贴钢板的厚度取3～6mm，并在加固设计中，按最大剪应力对钢板厚度进行验算。
[Abstract]:The technology of strengthening and reforming concrete structure has been developed for 30 to 40 years, and a set of professional reinforcement methods have been formed. Only some columns and load-bearing walls need to be removed to carry out the reinforcement and reconstruction of housing structures by means of underpinning technology. During the period of strengthening and rebuilding, it has little influence on other members, and basically does not affect the normal use and production life of buildings. In engineering practice, the common reinforcement methods include the reinforcement method of increasing cross-section and the method of strengthening steel with external adhesion. The paper mainly discusses the application of the above methods in the reconstruction technology of "supporting beam and changing column" structure, such as the method of strengthening with steel plate, the method of strengthening with fiber composite material and the method of strengthening with external prestressing force. On this basis, a new type of truss reinforcement is studied. In this paper, a five-story frame structure "beam replacement column" structural transformation project is studied, and the reinforcement design method and idea of local support replacement are put forward. Firstly, the engineering background is briefly summarized. The scope and content of the reinforcement and transformation, the relevant theoretical analysis basis and basic conditions, using the PKPM structure series of software modeling, before and after the simulation of the transformation of the engineering structure of the overall internal force calculation. The stress and bearing capacity level of underpinning members are analyzed to determine whether the influence on other components around it, the degree of influence and whether the influence can be neglected. Secondly, the traditional calculation method of section bearing capacity and the newly designed reinforcement method are introduced, and the optimization design of strengthening scheme is carried out to check the strength of the members that need to be strengthened. Thirdly, through the ABAQUS finite element analysis software to carry on the local force analysis to each kind of reinforcement plan, carries on the computation and the contrast to the need to strengthen the member's deformation, and synthetically compares each kind of plan's technical feasibility. Economic indexes and construction feasibility of various schemes are summarized, and the characteristics and scope of application of various methods of underpinning reinforcement and reconstruction are summarized. Finally, the local underpinning method, which is suitable for this project, is selected. The key factors such as the stiffness and thickness of adhesive adhesive are discussed in view of the key factors that affect the bonding effect in the method of bonding steel plate reinforcement. The thickness of steel plate is analyzed by local finite element method. The thickness of adhesive has a great influence on the strengthening effect of steel plate. This paper suggests that the thickness of adhesive is 2mm. It is suggested that the thickness of steel plate should be 3 mm and 6 mm, and the thickness of steel plate should be checked according to the maximum shear stress in the reinforcement design.
【学位授予单位】：南昌大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU746.3

【参考文献】