HRB600级钢筋高强混凝土无腹筋梁受剪试验研究  

EXPERIMENTAL RESEARCH ON SHEAR PERFORMANCE OF HRB600 STEEL AND HIGH-STRENGTH CONCRETE BEAMS WITHOUT WEB REINFORCEMENT

作　　者：张建伟[1] 张德利 冯曹杰 曹万林[1] ZHANG Jian-wei;ZHANG De-li;FENG Cao-jie;CAO Wan-lin(Key Laboratory of Urban Security and Disaster Engineering of China Ministry of Education,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124

出　　处：《工程力学》2020年第S01期275-281,共7页Engineering Mechanics

基　　金：国家自然科学基金项目(51678009);北京市教委科技重点项目(KZ201710005003)。

摘　　要：为了解配置HRB600级纵筋的高强混凝土梁受剪性能,以纵筋配筋率、混凝土钢纤维掺量为变化参数,对5根配置HRB600级纵筋的无腹筋梁进行了受剪试验,对比分析了各试验梁的斜截面承载力、荷载-挠度曲线、裂缝宽度和破坏特征。研究结果表明:随着纵筋配筋率的提高,HRB600级钢筋高强混凝土梁的开裂荷载和斜截面极限荷载增大,斜裂缝宽度减小;钢纤维可以有效地提高高强混凝土梁的斜截面开裂荷载,限制斜裂缝的产生与发展;随着钢纤维掺量的增加,高强混凝土梁的受剪承载力增大;使用现行混凝土结构设计规范和纤维混凝土结构技术规程对配置HRB600级纵筋的高强混凝土梁和钢纤维高强混凝土梁的斜截面受剪承载力进行设计计算,其结果是偏于安全的。In order to investigate the shear behavior of high-strength concrete beams with HRB600 steel bars,the monotonic loading tests of five concrete beams with longitudinal high-strength reinforcement were carried out.The main design parameters of test specimens were longitudinal reinforcement ratio and steel fiber contents.The shear load-carrying capacity,load-deflection curve,crack width,failure characteristics of each specimen were compared.The test results show that the cracking load and ultimate shear load of high-strength concrete beams increase with the increase of longitudinal reinforcement ratio,but the width of diagonal cracks decreases;the steel fiber can effectively improve the cracking load of high-strength concrete beams and limit the generation and development of diagonal cracks;with the increase of steel fiber content,the shear load-carrying capacity of highstrength concrete beams increases;the shear load-carrying capacity of test beams was calculated using the current code for design of concrete structures and technical specification for application of fiber reinforced concrete,and the calculated results were less than the measured results.

关 键 词：HRB600级钢筋 高强混凝土 钢纤维 无腹筋梁 受剪性能 

分 类 号：TU375.1[建筑科学—结构工程]