高层钢筋混凝土框架结构加固方法优化设计研究

发布时间：2018-01-05 03:01

本文关键词：高层钢筋混凝土框架结构加固方法优化设计研究　出处：《长沙理工大学》2013年硕士论文　论文类型：学位论文

【摘要】：随着我国经济稳定发展，建筑工程的重点慢慢从大规模新建工程转向新建、维修与改造共同进行。城市发展开始往城镇与郊区发展，而城市中心的建筑开始老化或满足不了使用需求，因此出现了越来越多的加固改造项目。结构加固方法多种多样，在工程中由于方案选择不当而造成严重后果的事例屡见不鲜，因此如何保证加固方案的技术性可靠、经济上合理、安全性最佳，如何进行加固方案的最优化选择与设计，是一直困扰工程设计的难题。目前加固计算还仅限于按照规范进行手算或者应用小型计算软件进行单根构件的计算，原因主要在于程序中定义或输入加固材料的本构关系较为困难，这已不满足现在越来越复杂的建筑结构。如何能将加固材料性能输入结构计算模型，将加固融合进复杂结构模型整体计算中，是一直以来设计人员努力的方向。，解决这一问题将极大增强加固计算的可靠性，方便设计人员进行加固设计。本文对高层钢筋混凝土框架结构的加固方法、加固计算及加固方案优化设计方法进行了研究和分析，主要工作内容如下： 1.阐述了体系加固的概念，指出现阶段加固设计与研究的局限性，提出了加固后结构体系计算的新思路与计算方法； 2.使用PKPM鉴定加固模块，引入加固材料本构关系，解决了加固计算中材料性能输入的问题，建立了加固后高层钢筋混凝土框架结构有限元计算模型，并进行了加固后结构体系计算分析。对长沙某商业大楼加固改造实例进行了对比计算，得到不同加固方法对结构体系的不同响应； 3.采用增大截面法、外包型钢法、置换混凝土法、粘帖钢板法、粘帖FRP法等不同方法对高层框架结构加固改造进行计算、分析及比较，得出增大截面法对梁挠度的降低最为明显，粘帖钢板法与粘帖FRP法对降低梁计算配筋效果明显及增大截面法对综合抗震能力指数有明显提高等有益结论； 4.本文提出高层框架结构加固方案优化的模糊综合评判方法，确定了评价体系因素集，定义隶属函数解决了评判中非确定性、难以量化因素的评价等级问题，建立了模糊评判矩阵，从力学性能、施工便捷性、经济性三方面对不同加固方案进行模糊综合评判及优化分析。本文优化分析方法可为同类工程提供参考和依据。
[Abstract]:With the steady development of our country's economy, the emphasis of the construction project is slowly changing from the large-scale new construction to the new construction, and the maintenance and renovation are carried out together. The urban development begins to develop into the towns and the suburbs. But the buildings in the city center are aging or can not meet the needs of use, so there are more and more reinforcement projects. In the project due to improper selection of the project due to serious consequences of the case is common, so how to ensure the technical reliability of the reinforcement scheme, economically reasonable, the best security. How to optimize the selection and design of reinforcement schemes has been a difficult problem in engineering design. At present, the reinforcement calculation is limited to the manual calculation according to the code or the calculation of a single member by using the small calculation software. The main reason is that it is difficult to define or input the constitutive relation of the reinforcement material in the program. This is not satisfied with the more and more complex building structure now. How to input the performance of the reinforcement materials into the structural calculation model and integrate the reinforcement into the whole calculation of the complex structure model. Solving this problem will greatly enhance the reliability of the reinforcement calculation and facilitate the designers to carry out the reinforcement design. In this paper, the reinforcement method, reinforcement calculation and optimization design method of high-rise reinforced concrete frame structure are studied and analyzed. The main work is as follows: 1. This paper expounds the concept of system reinforcement, points out the limitation of reinforcement design and research at present, and puts forward a new idea and calculation method for the calculation of reinforced structure system. 2.Using PKPM identification and strengthening module, introducing the constitutive relation of strengthening material, solving the problem of material performance input in reinforcement calculation, and establishing the finite element calculation model of reinforced concrete frame structure after reinforcement. The calculation and analysis of the reinforced structure system are carried out. The comparison calculation of a commercial building reinforcement and reconstruction example in Changsha is carried out, and the different responses of different reinforcement methods to the structure system are obtained. 3. The reinforcement and reconstruction of high-rise frame structure are calculated, analyzed and compared by different methods, such as the method of increasing section, the method of steel section, the method of replacement concrete, the method of sticking steel plate and the method of FRP. The results show that the beam deflection is decreased most obviously by increasing section method, the effect of bonding steel plate method and FRP method on reducing beam reinforcement is obvious, and the increasing section method can obviously increase the comprehensive seismic capacity index. 4. In this paper, a fuzzy comprehensive evaluation method is proposed to optimize the reinforcement scheme of high-rise frame structure, the evaluation system factor set is determined, and the non-deterministic evaluation is solved by defining membership function. It is difficult to quantify the evaluation grade of factors, and a fuzzy evaluation matrix is established, which is based on mechanical properties and construction convenience. Fuzzy comprehensive evaluation and optimization analysis of different reinforcement schemes are carried out in three aspects of economy. The optimization analysis method in this paper can provide reference and basis for similar projects.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU973.15

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