预应力钢绞线加固损伤梁抗剪性能试验研究  

Experimental study on shear performance of damaged beams strengthened by prestressed steel strands

作　　者：司建辉[1] 张旺 SI Jianhui;ZHANG Wang(School of Civil Engineering and Architecture,Xi'an University of Technology,Xi'an 710048,China)

机构地区：[1]西安理工大学土木建筑工程学院,西安710048

出　　处：《建筑结构》2020年第15期20-24,共5页Building Structure

基　　金：西安市建设科技项目(SJW2015—21)。

摘　　要：针对受损钢筋混凝土梁开展绕丝加固试验研究,进行了5组试验,其中第一组为未受损未加固梁,第二组为未受损加固梁,其余三组均为受损加固梁。选取裂缝宽度作为受损指标,通过对试件的破坏形态、荷载-挠度关系曲线、箍筋应变等试验结果的分析,研究钢筋混凝土梁受损程度对抗剪承载力和变形能力的影响。研究结果表明:未受损未加固梁在采用绕丝加固后,其抗剪承载力有所提升。通过受损试件之间对比可以看出,当在钢绞线预加应力相同的情况下,加固梁抗剪承载力随着受损程度的增大而下降。预应力钢绞线加固可有效抑制钢筋混凝土梁斜裂缝的发展,改善加固梁破坏形态,且对梁的延性、承载力都有显著提升效果。Five sets of tests were carried out on the study of wire winding reinforcement test of damaged reinforced concrete(RC)beams,of which the first group was undamaged and unreinforced beams,the second group was undamaged reinforced beams,and the remaining three groups were damaged reinforced beams.The crack width was selected as the damage indicator.Through the analysis of the test results of the failure mode,load-deflection curve and stirrup strain of the test specimen,the influence of the damage degree of the RC beam on the shear capacity and deformation capacity was studied.The results of the study show that the undamaged and unreinforced beams have improved their shear bearing capacity after being wound with wire.It can be seen from the comparison between the damaged specimens that when the prestressing of the steel strands is the same,the shear bearing capacity of the reinforced beam decreases with the increase of the degree of damage.The reinforcement of prestressed steel strands can effectively inhibit the development of diagonal cracks of reinforced concrete beams,improve the failure form of reinforced beams,and have a significant effect on the ductility and bearing capacity of beams.

关 键 词：绕丝加固 抗剪承载力 预应力钢绞线 延性 

分 类 号：TU375.1[建筑科学—结构工程]