基于桁架拱模型的活性粉末混凝土梁抗剪承载力研究  

Shear Strength of Reactive Powder Concrete Beams Based on Truss-arch Model

作　　者：罗伯光[1,2] 覃荷瑛[1,2] 金凌志[1,2] 

机构地区：[1]桂林理工大学土木与建筑工程学院,广西桂林541004 [2]广西岩土力学与工程重点实验室,广西桂林541004

出　　处：《建筑科学》2016年第7期1-7,共7页Building Science

基　　金：国家自然科学基金项目(51368013);广西自然科学基金项目(2013GXNSFAA019299)

摘　　要：通过9根高强钢筋活性粉末混凝土梁在两点加载作用下的抗剪性能试验,研究了剪跨比、配箍率以及纵筋配筋率等因素对活性粉末混凝土梁抗剪破坏形态及抗剪承载能力的影响。在桁架模型基础上考虑混凝土拱的作用即采用桁架拱模型对试验梁抗剪承载力进行了计算,对比我国规范GB 50010-2010、美国规范ACI 318-08以及欧洲规范EN 1992-1-1:2004的计算结果,并与试验值进行对比。结果表明:上述规范抗剪承载力计算公式偏于保守,桁架拱模型较其他规范对活性粉末混凝土梁抗剪承载力的计算更为准确。A total of nine reactive powder concrete beams with high-strength reinforcement failing in shear under two symmetrically concentrated loads are tested. The main variables taking into consideration are shear span ratio and longitudinal reinforcement ratio as well as stirrup ratio. Shear failure modes and shear strength of the tested beams are analyzed. Shear strength of the beams are calculated using the truss-arch model that the effect of the concrete arch is considered in the truss model. Furthermore,the measured shear strength is compared with the calculated values by GB50010—2010（ China Standard）,ACI318-08（ American Standard）,EN1992-1-1： 2004（ European standard） and the truss-arch model for shear strength. The results show that the calculated strength of the above standards is conservative,and the calculated strength by the truss-arch model is consistent with the test data and shows a good correlation.

关 键 词：活性粉末混凝土 抗剪承载力 剪跨比 配箍率 纵筋配筋率 桁架+拱模型 

分 类 号：TU375.1[建筑科学—结构工程]