FRP嵌入式加固钢筋混凝土柱的抗震性能研究

发布时间：2018-06-03 14:37

本文选题：嵌入式 + 承载力　；参考：《吉林建筑大学》2017年硕士论文

【摘要】：FRP加固混凝土结构技术是近年来比较流行的一种加固技术,近些年此技术广泛的运用于建筑物加固和旧房改造的各个方面,该技术是利用碳纤维或者其他纤维材料,使得二者共同工作以达到对于结构构件的增强和改进的效果。在此之前,国内比较常见的FRP加固方式是外贴板材加固,对于柱的加固也是经常使用外贴法。与传统的加固法相比,嵌入式加固法除具有粘贴FRP材料加固法有的优点外,还具有如下优点:a)FRP材料与原结构粘结较好;b)可以削弱火灾对FRP材料的破坏;c)可以有效的进行负弯矩加固;d)可以充分利用FRP材料得到强度,能有效提高结构构件的极限承载力。嵌入式加固常见使用于梁板结构的加固,NSM应用于RC柱的情况如今在国内并没有得到广泛的认可。国内较为常用的加固柱的方法一般是外包角钢或者外部约束纤维材料等。在国外,嵌入式加固柱已经成为一种比较常见的加固方式。本文基于Barros的研究基础,将嵌入式加固技术引入有截面损伤的RC柱的加固中。文章里主要通过有限元软件模拟,研究了嵌入式CFRP材料运用到柱的加固时,加固柱的承载力和延性等可靠性指标的提高效果。文章除去绪论和结论及展望两个章节,一共分为三个章节。第二章主要阐述了嵌入式加固RC柱的抗弯试验过程,包括试验组的设置、材料选取、加载装置和试验数据,并简单介绍了该试验得到结论,一方面印证了嵌入式加固方法用于RC柱的加固对于其承载力和延性的提高是可行的,另一方面为后面的进一步探究提出了前提。第三章主要阐述了采用ABAQUS有限元软件模拟实验组的模拟结果,其中一部分是根据实验过程模拟的RC柱的抗弯受力过程,考虑CFRP板条的良好的抗拉强度,板条沿着柱水平方向通长布置,模拟荷载施加水平力和轴压力的作用,根据试验,主要控制变量是嵌入式板条的间距、轴压比以及不同的加固方式(包括嵌入式加固、外包式加固以及复合加固方法);由试验数据与模拟数据的比较得出结论是嵌入式加固方式用于RC柱是可行的,研究了轴压比、加固板条间距等因素对于嵌入式加固的承载力和延性的提高水平以及复合式加固方法对于RC柱的极限抗剪承载力以及抗震的提高作用更为明显,为后面嵌入式加固后,拟合柱的承载力的提高率的公式提出奠定了基础。第四章将前两章的试验数据和模拟数据进行了详细的拟合和比较,根据曲线的拟合得到了嵌入式加固的承载力提高公式。本文以ABAQUS软件为平台对CFRP嵌入式加固柱受力性能进行模拟研究,针对各个柱受力全过程做了比较与分析,说明在采取合理的单元类型、本构关系等情况下可以有效模拟CFRP嵌入式加固混凝土结构的受力及变形情况,通过模拟给出了柱的滞回曲线,同时对有限元计算的塑形系数、承载力进行了分析,模拟结果与试验数据相吻合。
[Abstract]:FRP reinforcement of concrete structures is a popular reinforcement technology in recent years. In recent years, this technology is widely used in various aspects of building reinforcement and old house reconstruction, the technology is to use carbon fiber or other fiber materials. Make the two work together to achieve the effect of strengthening and improving the structural components. Before this, the common FRP reinforcement method in China is the external sticking plate reinforcement, and the external sticking method is often used for the column reinforcement. Compared with the traditional reinforcement method, the embedded reinforcement method has the advantages of the FRP material strengthening method. It also has the following advantages: (1) FRP materials bond well with the original structure (b) can weaken the damage of FRP materials caused by fire) can effectively strengthen the FRP materials by negative bending moment) and can make full use of FRP materials to obtain strength, and can effectively improve the ultimate bearing capacity of structural members. The application of NSM in RC columns is not widely accepted in China. The commonly used reinforcement methods in China are external angle steel or externally confined fiber materials. In foreign countries, embedded reinforcement column has become a relatively common reinforcement method. Based on the research of Barros, the embedded reinforcement technique is introduced to RC columns with section damage. In this paper, the improvement effect of reliability indexes such as bearing capacity and ductility of columns strengthened with embedded CFRP material is studied by means of finite element software simulation. Apart from the introduction and conclusion and outlook, the article is divided into three chapters. The second chapter mainly describes the bending test process of RC columns strengthened by embedded system, including the setting of test group, material selection, loading device and test data, and briefly introduces the conclusion of the test. On the one hand, it is proved that it is feasible to improve the bearing capacity and ductility of RC columns strengthened by embedded reinforcement method, and on the other hand, the premise is put forward for further exploration. In the third chapter, the simulation results of the experimental group with ABAQUS finite element software are mainly described. Part of the simulation results are based on the bending stress process of RC column simulated by the experimental process, and the good tensile strength of the CFRP slab is considered. According to the experiment, the main control variables are the spacing of embedded slabs, axial compression ratio and different reinforcement methods (including embedded reinforcement). By comparing the experimental data with the simulated data, it is concluded that the embedded reinforcement method is feasible for RC columns, and the axial compression ratio is studied. The improvement of the bearing capacity and ductility of embedded columns due to the space between plates and strips, and the effect of composite reinforcement methods on the ultimate shear capacity and seismic resistance of RC columns are more obvious. The formula of increasing the bearing capacity of fitting column is put forward. In the fourth chapter, the experimental data of the first two chapters and the simulated data are fitted and compared in detail. According to the curve fitting, the formula for improving the bearing capacity of embedded reinforcement is obtained. In this paper, ABAQUS software is used as the platform to simulate and study the mechanical behavior of CFRP embedded strengthened columns, and the comparison and analysis of the whole process of each column are made, which shows that reasonable element types are being adopted. Under the condition of constitutive relation and so on, the stress and deformation of CFRP reinforced concrete structure can be effectively simulated. The hysteretic curve of column is given by simulation, and the plastic coefficient and bearing capacity calculated by finite element method are analyzed. The simulation results are in agreement with the experimental data.
【学位授予单位】：吉林建筑大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU375.3

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