【作者】 陈升平；

【Author】 CHEN Shengping (College of Civil Engineering,Hubei University of Technology,Wuhan 430068,Hubei,China)

【机构】 湖北工业大学土木与建筑学院；

【摘要】 拉应力与裂缝张开位移关系不仅是运用断裂力学理论分析纤维增强水泥基复合材料的一个基本材料参数,而且是进行纤维混凝土结构或构件非线性有限元数值模拟的一个重要材料参数。利用三点弯曲缺口梁的荷载与裂缝口张开位移(CMOD)曲线用反分析法确定了钢纤维水泥砂浆的拉应力与裂缝张开位移关系,同时数值模拟了三点弯曲缺口梁的荷载与挠度曲线。计算结果表明,三点弯曲缺口梁跨中挠度与CMOD呈线性关系,比例系数为0.79。更多还原

【Abstract】 The stress-crack opening relationship is a basic material input in fracture mechanics-based design methodology and nu- merical simulation for fiber reinforced cementitious composites.In the present study,the tensile stress-crack opening relationship of steel fiber reinfnrced mortar (SFRM) is determined by inverse analysis using load versus crack mouth opening displacement(CMOD) curve from notched beam tests.Moreover,the relationship of beam deflection and CMOD is numerically obtained.Results show that the dcflec- tion-CMOD curve is linear with a ratio of 0.79 in the post-peak regime.更多还原