HRB600级钢筋钢纤维高强混凝土梁的受弯性能  

FLEXURAL BEHAVIOR OF STEEL FIBER REINFORCED HIGH-STRENGTH CONCRETE BEAMS WITH HRB600 STEEL BARS UNDER MONOTONIC LOADING

作　　者：张建伟[1] 郭旺 冯曹杰 曹万林[1] ZHANG Jianwei;GUO Wang;FENG Caojie;CAO Wanlin(Key Laboratory of Urban and Engineering Security Disaster of 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：《工业建筑》2020年第9期49-54,共6页Industrial Construction

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：以不同钢纤维掺量和混凝土强度等级为变化参数,对4根HRB600级钢筋钢纤维高强混凝土梁进行了受弯性能试验,同时结合相关文献中HRB600级未掺钢纤维钢筋高强混凝土梁的试验数据,对比分析各试验梁的破坏特征、挠度、承载力、纵筋应变与裂缝宽度,评价了极限承载力、挠度及裂缝宽度计算方法。试验结果表明:配置600 MPa级高强钢筋的钢纤维混凝土梁的应变变化符合平截面假定;钢纤维可有效提高高强混凝土梁的弯曲开裂荷载和变形能力,抑制裂缝的产生与发展;且随着钢纤维掺量的增加,钢纤维高强混凝土梁的受弯承载力也随之增大;现行CECS 38∶2004《纤维混凝土结构技术规程》中的计算方法,对HRB600级钢筋钢纤维高强混凝土梁的极限承载力计算、最大裂缝宽度计算和挠度计算仍然具有较好的适用性。The flexural behavior of 4 steel fiber reinforced high-strength concrete beams with HRB600 steel bars was tested with different steel fiber contents and concrete strength grades.At the same time,the failure characteristics,deflection,bearing capacity,longitudinal reinforcement strain and crack width were compared and analyzed,and the calculation methods of ultimate bearing capacity,deflection and crack width were evaluated.The test results showed that the section strain change of steel fiber reinforced concrete beam with HRB600 steel bars conformed to flat section assumption.Steel fiber could effectively improve the bending cracking load and deformability of high-strength concrete beams and limit the generation and development of the bending vertical cracks.With the increase of steel fiber content,the flexural bearing capacity of steel fiber reinforced high-strength concrete beams increased.The current calculation method of CECS 38∶2004 Technical Specification for Fiber Reinforced Concrete Structures was still applicable to the calculation of the ultimate bearing capacity,maximum crack width and deflection of the steel fiber reinforced high-strength concrete beams with HRB600 steel bars.

关 键 词：HRB600级钢筋 钢纤维 高强混凝土梁 受弯性能 

分 类 号：TU375.1[建筑科学—结构工程]