复合砂浆钢筋网加固钢筋混凝土梁的抗剪性能研究

发布时间：2018-05-21 17:48

本文选题：复合砂浆 + 抗剪加固　；参考：《吉林建筑大学》2017年硕士论文

【摘要】：复合砂浆钢筋网加固法是一种比较新颖的用于补强砌体结构或者混凝土结构的加固技术。随着社会发展,建筑结构的多样化,原有的加固技术难以满足当今多样的建筑结构,导致这种新型加固技术越来越受到青睐。该种加固技术有多种优点:(1)这种加固方式在本质上是一种体外配筋,即利用增加构件的配筋量,来达到提高构件抗弯、抗剪等性能的目的。(2)复合砂浆具有优良的物理性能,可以很好的保护钢筋网,同时也可以配合原结构协同工作。(3)该加固技术适用于加固各种结构,应用范围较广。由于该加固技术比较新颖,现在对该技术的研究较少,特别是对加固梁的抗剪性能研究,本文主要通过模拟复合砂浆钢筋网加固后的钢筋混凝土梁受剪作用,来研究该加固技术对梁抗剪性能的影响。本文首先利用ABAQUS有限元分析软件模拟已知的两根试验梁,然后对比模拟梁和试验梁的数据,来验证有限元模型的准确性和可靠度,结果表明,本文所建立的模型准确可靠且可用于模拟其他梁。本文通过ABAQUS有限元软件模拟了13根梁(3根对比梁,10根加固梁)的抗剪试验。通过分析剪跨比、加固方法、加固箍筋配筋率以及加固箍筋分布方式对加固梁抗剪承载力、破坏形态、挠度以及箍筋应变的影响,深入研究复合砂浆加固法对梁的抗剪性能。模拟结果表明:梁的抗剪承载力随着剪跨比的增大而减小;加固配箍率越大,对梁抗剪承载力提高的越大,但两者不成正比,继续加大加固配箍率,提高的幅度会相对折减;加固配箍率对加固梁的荷载-箍筋应变曲线影响较小;剪跨区加固箍筋的位置影响加固梁的抗剪承载力。利用“桁架-拱”理论推导出复合砂浆钢筋网加固梁的抗剪承载力理论计算公式,理论计算公式计算出的加固梁抗剪承载力与模拟结果比较吻合。
[Abstract]:The reinforcement technology of composite mortar reinforcement is a kind of new reinforcement technology for reinforcing masonry structure or concrete structure. With the development of society and the diversification of the building structure, the original reinforcement technology is difficult to meet the various architectural structures, and this new reinforcement technique is becoming more and more popular. There are many kinds of reinforcement technology. Advantages: (1) this reinforcement method is in essence an external reinforcement, that is, to increase the reinforcement amount of the component to improve the bending and shearing properties of the components. (2) the composite mortar has excellent physical properties, and it can protect the steel net well, and also work in coordination with the original structure. (3) the reinforcement technology is suitable for reinforcement. All kinds of structures have a wide range of applications. Because of the new reinforcement technology, there is little research on this technology, especially for the study of the shear performance of reinforced beams. This paper mainly studies the effect of the reinforcement technology on the shear performance of the beams by simulating the Liang Shoujian effect of reinforced concrete after reinforcement of the reinforced concrete reinforced concrete mortar. The ABAQUS finite element analysis software is used to simulate two known test beams, then compare the data of the simulated beam and the test beam to verify the accuracy and reliability of the finite element model. The results show that the model established in this paper is accurate and reliable and can be used to simulate other beams. In this paper, 13 beams (3 contrast beams, 10) are simulated by the ABAQUS finite element software. By analyzing the shear span ratio, the reinforcement method, the reinforcement ratio of the stirrups and the distribution mode of the reinforced hoop reinforcement on the shear bearing capacity, the damage form, the deflection and the strain of the stirrup, the shear strength of the composite mortar reinforcement method is deeply studied. The simulation results show that the shear bearing capacity of the beam is with the shear span. The greater the ratio of the ratio, the greater the reinforcing hoop rate, the greater the shear strength of the beam, the greater the shear strength of the beam, but the two will not be proportional to the reinforcement ratio, and the increase of the increase will be relatively reduced; the reinforcement and the stirrup ratio has little effect on the load and the strain curve of the reinforced beam; the position of reinforcing stirrup in the shear span affects the shear bearing capacity of the reinforced beam. The theoretical calculation formula of the shear bearing capacity of the reinforced concrete beams reinforced with composite mortar is derived from the truss arch theory. The shear capacity of the reinforced beam calculated by the theoretical calculation formula is in agreement with the simulation results.
【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

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