FRP筋嵌入式加固损伤混凝土梁受剪性能研究

发布时间：2018-06-03 04:35

本文选题：FRP + 嵌入式　；参考：《吉林建筑大学》2017年硕士论文

【摘要】：自上世纪八十年代以来,FRP作为一种新兴的材料被越来越多的被应用于工程构件的加固中,最常见的FRP加固方式分为两种:外贴式和嵌入式。最先被大量研究的是外贴式,嵌入式相比外贴式具有锚固效果明显、耐腐蚀、受外界荷载干扰小、节省用料等优点,因此国内外学者做了大量试验进行嵌入式加固的研究。目前,国内嵌入式加固梁抗弯加固的研究成果较多,而研究嵌入式加固梁的抗剪加固则相对较少,因此本文主要研究FRP筋嵌入式加固钢筋混凝土梁的抗剪性能。本文主要通过模拟结合试验对照,设计了13根钢筋混凝土梁(其中1根为对比梁,12根为加固梁),分别考虑FRP筋加固量、FRP筋嵌贴角度和初始荷载等参数对钢筋混凝土梁抗剪性能的影响,将其中5根混凝土梁的模拟结果与试验结果进行验证,验证结果比较吻合。根据以往FRP嵌入式加固梁的研究成果,参考箍筋的抗剪承载力计算公式,推导并拟合出在二次受力情况下FRP筋加固钢筋混凝土梁的抗剪承载力计算公式。本文采用ABAQUS有限元分析软件对FRP筋嵌入式加固损伤混凝土梁进行了建模,并对各试件进行了加载分析,结果表明:随着FRP加固量的增大,钢筋混凝土梁的抗剪承载力显著提高;FRP嵌入角度为45°时较90°抗剪承载力有了显著提高;在FRP筋加固钢筋混凝土梁中,初始荷载值越大,最终的极限承载力越小,虽然差距不大,但是对于要求计算精度较高的设计,初始荷载的影响是不可忽略的。本文提出的FRP筋嵌入式加固损伤混凝土梁的抗剪承载力计算公式计算结果与模拟结果较吻合,可供研究者参考。
[Abstract]:Since the eighties of the last century, as a new material, FRP has been used more and more in the reinforcement of engineering components. The most common FRP reinforcement methods can be divided into two types: external mount and embedded. The first thing that has been studied is the external sticker, which has many advantages, such as obvious anchoring effect, corrosion resistance, little interference from external load, saving material and so on. Therefore, domestic and foreign scholars have done a lot of research on embedded reinforcement. At present, there are many researches on the flexural strengthening of embedded beams in China, but less on the shear strengthening of embedded beams. Therefore, this paper mainly studies the shear behavior of reinforced concrete beams strengthened with FRP bars. This article mainly through the simulation union experiment contrast, Thirteen reinforced concrete beams (one of which is a contrast beam and 12 beams) are designed to reinforce the beams. The effects of the reinforcement angle and initial load on the shear behavior of the reinforced concrete beams are considered, respectively. The simulation results of 5 concrete beams are compared with the experimental results. According to the previous research results of FRP embedded strengthened beams and referring to the formula of shear bearing capacity of stirrups, the formulas of shear bearing capacity of reinforced concrete beams strengthened with FRP bars under secondary loading are deduced and fitted. In this paper, the ABAQUS finite element analysis software is used to model the damaged concrete beams strengthened with FRP bars. The results show that with the increase of the amount of FRP reinforcement, the load analysis of each specimen is carried out. The shear bearing capacity of reinforced concrete beams is significantly improved when the embedding angle is 45 掳, and the ultimate bearing capacity of reinforced concrete beams strengthened with FRP bars is smaller, although the difference is small. However, the effect of initial load should not be ignored for the design with high accuracy. The calculation results of shear capacity of damaged concrete beams strengthened with FRP bars are in good agreement with the simulation results, which can be used as a reference for researchers.
【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】：TU375.1

【相似文献】