高强混凝土抗剪强度和剪切变形试验研究  

Experimental study on shear strength and shear deformation of high strength concrete

作　　者：唐甜[1] 李碧雄[1] 赵祖芳 

机构地区：[1]四川大学建筑与环境学院,四川成都610065

出　　处：《四川建筑科学研究》2017年第3期126-131,共6页Sichuan Building Science

基　　金：四川省应用基础计划(2014JY0186)

摘　　要：通过一系列立方体抗压强度试验确定了高强混凝土的配合比,在对比分析已有的混凝土抗剪试验方法的基础上,选择了应力分布均匀且容易实现的等高变宽梁抗剪试验方法,完成了不同强度(fcu=65~95 MPa)的4组24个高强混凝土试件的抗剪试验,通过应力和应变量测,得到了各组试件的主应力-主应变及剪应力-剪应变关系,并确定了其剪切强度,基于各试件的剪切破坏特征,探讨了高强混凝土的剪切破坏机理,研究了抗剪强度与抗压强度的关系式,建议了剪应力-剪应变曲线方程以及剪切模量的计算式。研究表明,高强混凝土的剪切性能与普通混凝土存在明显的不同。A series of cubic compressive strength tests were conducted to determine the mix proportion of high strength concrete. After analyzing the existed concrete shear methods, a realizable experimental method of four points loaded beam specimen was chosen, whose shear stress distribution was uniform in the middle. Four groups of 24 specimens with different strengths （from 65 MPa to 95 MPa） were tested through this shear method, the relationship of principal stress-principal strain and shear stress-shear strain of each group was obtained,and the shear strength was determined. A suggestion about the shear stress-shear strain curve equation and shear modulus calculation formula was given after analyzing the failure mode and failure mechanism and studying the relationship between the shear strength and the compressive strength. The research has showed that the shear performance of ordinary concrete and high strength concrete is significantly different.

关 键 词：高强混凝土 抗剪强度 剪切试验 剪应力-剪应变关系 破坏特征 

分 类 号：TU528.041[建筑科学—建筑技术科学]