摘要
采用一种只基于线弹性理论基础的新型断裂准则——临界距离理论,对3种强度、槽口深度、槽根部半径共27种组合下的U型槽口梁试件进行三点弯曲实验。通过公式计算和有限元模拟得出及校核临界距离理论参数,并据此推导出一种预测槽口梁试件最大荷载的新公式。分析发现,对于不同槽口特征下试件的最大荷载,新公式具有良好的预测精度,且临界距离理论参数L值随砂浆强度的增长而增大。
The study of the mechanical properties of engineering materials such as cement paste and cement mortar has become increasingly important with the needs of engineering applications.In this paper,the three-point bending beam test for the U-shaped notched beam specimens with three types of strengths,groove depths and groove root radii were carried out with a new fracture criterion_the theory of critical distance,which consist of 27 combinations in total.Theoretical parameters were obtained and verified by formula calculation and finite element simulation,and a new formula for calculating the maximum load of the notched beam was derived.The observation shows that for the maximum load,the calculated value of the new formula has good precision.The strength of mortar increases,while the theoretical parameter L value increases.
作者
童谷生
盛杰辉
Tong Gusheng;Sheng Jiehui(School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China)
出处
《华东交通大学学报》
2019年第4期102-112,共11页
Journal of East China Jiaotong University
基金
国家自然科学基金项目(11242006,11462005)
关键词
临界距离
三点弯曲实验
有限元模拟
最大荷载
the theory of critical distance
the three-point bending beam test
finite element simulation
maximum load
