摘要
对超高强混凝土无腹筋梁进行剪切试验及分析,研究混凝土强度对梁抗剪性能的影响,指出随着混凝土强度的提高,超高强梁剪切抗力的增加程度减缓.基于修正压缩区理论及剪切试验结果,对现行规范剪力计算公式中混凝土抗压强度的影响进行了修正,提出适用于超高强混凝土无腹筋梁抗剪承载力的建议式.结果表明,试验值与建议式计算值之比的均值为0.97,变异系数为24.30%,可较好反映混凝土强度对剪切承载力的影响.
It is aimed at studying the effect of concrete strength on shear property by experiment and calculation a- nalysis for ultra high strength concrete beams without web reinforcements. The present investigation indicates that shear resistance of ultrahigh strength beams increase slowly with the increase of concrete compressive strength, and that shear of this kind of beam is overestimated by the current design provisions in ultrahigh strength zone. For this reason, the concrete strength effect of shear design equation was modified, and an improved shear equa- tion was presented to apply ultrahigh strength concrete beams without stirrups based on MCFT methods and shear test results including other researcher＇s experiments. The analytical results show that the mean of （test value/cal- culated value by the modified equation） is 0. 97 with coefficient of variation of 24. 30%. The recommended for- mula in this paper can better evaluate the influence of concrete strength on the shear strength concrete RC beams. bearing capacity for ultrahigh
出处
《深圳大学学报（理工版）》
EI
CAS
北大核心
2012年第2期136-141,共6页
Journal of Shenzhen University(Science and Engineering)
基金
国家自然科学基金资助项目(51078236)
国家杰出青年科学基金资助项目(50925829)~~
关键词
超高强混凝土
无腹筋梁
压缩强度
抗拉强度
修正压缩区理论
剪力计算式
修订混凝土设计规范
ulstrength tensilecrete structuretrahigh strength concrete reinforced concrete beam without strength modified compression field theory shear equation web reinforcements compressiverevision of code for design of con-
