预应力钢带加固钢筋混凝土梁抗剪性能试验研究  

Experimental Study on Shear Performance of Reinforced Concrete Beams Strengthened with Prestressed Steel Strips

作　　者：李权平 李俊华[1] 叶超何 思聪 顾炬锋 LI Quanping;LI Junhua;YE Chao;HE Sicong;GU Jufeng(School of Civil and Environmental Engineering,Ningbo University,Ningbo,Zhejiang 315211,China)

机构地区：[1]宁波大学土木与环境工程学院,浙江宁波315211

出　　处：《施工技术（中英文）》2022年第9期27-31,36,共6页Construction Technology

基　　金：国家自然科学基金(51178226);浙江省公益技术研究计划(LGF18E080008)。

摘　　要：制作截面尺寸不同的3根未加固钢筋混凝土梁和3根预应力钢带加固钢筋混凝土梁,通过试验研究梁破坏形态、开裂荷载、抗剪承载力等。研究结果表明,随着荷载的增加,各试件最终均发生剪切破坏,破坏过程可分为初裂、裂缝发展、压溃破坏阶段;加固梁截面尺寸越小,钢带应变发展越快,对构件的约束作用越强;预应力钢带对加固梁弯曲开裂荷载的影响较小,但可提高8.89%~13.51%的斜裂缝开裂荷载,提高6.27%~7.50%的极限抗剪承载力。Three unstrengthened reinforced concrete beams with different cross-sectional dimensions and three reinforced concrete beams strengthened with prestressed steel strips were fabricated.The failure modes,cracking loads,and shear bearing capacity of the beams were studied through experiments.The research results show that with the increase of the load,the shear failure of each specimen finally occurs,and the failure process can be divided into the stages of initial cracking,crack development and crushing failure.The smaller the section size of the strengthened beams,the faster the strain development of the steel strips,and the stronger the restraint effect on the components.The prestressed steel strip has little effect on the flexural cracking load of the strengthened beam,but it can increase the cracking load of diagonal cracks by 8.89%~13.51%,and increase the ultimate shear bearing capacity by 6.27%~7.50%.

关 键 词：钢筋混凝土梁 预应力 钢带 抗剪强度 加固 

分 类 号：TU375[建筑科学—结构工程]