高强轻集料钢筋混凝土梁抗剪性能试验  

Experimental research on shear capacity of reinforced high-strength lightweight concrete beams

作　　者：刘沐宇[1] 尹华泉[1] 丁庆军[2] 胡曙光[2] 

机构地区：[1]武汉理工大学道路桥梁与结构工程湖北省重点实验室,武汉430070 [2]武汉理工大学材料科学与工程学院,武汉430070

出　　处：《哈尔滨工业大学学报》2008年第4期620-624,共5页Journal of Harbin Institute of Technology

基　　金：国家高技术研究发展计划资助项目(2002AA335080)

摘　　要：为研究高强轻集料钢筋混凝土梁的抗剪性能,通过对10根高强轻集料混凝土梁和1根普通高强混凝土梁在集中荷载作用下的抗剪试验,研究了混凝土强度、配箍率、剪跨比等因素对构件抗剪强度的影响,分析了几种不同抗剪承载力公式的适用性.试验结果表明,高强轻集料钢筋混凝土梁斜截面破坏型态和普通混凝土梁相似;随着混凝土强度的提高,极限抗剪承载力提高的幅度较小;配箍率的提高,能提高极限抗剪承载力,但对斜裂缝的开裂和临界斜裂缝承载力影响很小.原规程JG J12-99中所规定的抗剪承载力公式不仅适用于普通轻集料混凝土,对于估算高强轻集料有腹筋梁的抗剪承载力也是适用的.In order to study the shear capacity of reinforced high-strength lightweight aggregate concrete （ HL- WAC） beams, an experiment was conducted through ten HLWAC beams and one high-strength normal concrete beam with and without web bars, which subjected to concentrated loads. The effects of concrete strength, stirrup ratio and shear span ratio on shear strength were researched. Some equations were researched in order to find whether they were appropriated to the HLWAC beams. The test result indicat that the HLWAC beams have the same failure style with high-strength normal concrete beam. The extent of the increase on the ultimate shear strength of beams is small with the increase of concrete strength. Increasing stirrup ratio can increase the ultimate shear strength, but little affects the diagonal crack and critical diagonal crack appearing. According to the analysis of test data, the equation elicited by old Code JGJ12 - 99 is applicable, not only to the normal strength lightweight concrete but also to the HLWAC beams.

关 键 词：高强轻集料 混凝土强度 配箍率 剪跨比 

分 类 号：TU377.1[建筑科学—结构工程]