含切口的混凝土试件承载力计算

Calculation of bearing capacity for concrete specimens with notch

为探寻大尺寸混凝土结构的承载力计算方法,对6种不同切口尺寸的混凝土紧凑拉伸试件的实验数据进行应力强度因子计算和承载力分析,计算结果表明各组试件的应力强度因子存在尺寸效应.通过应力强度因子的计算公式,结合双K断裂准则与粘聚裂纹阻力分析,对该材料结构的承载力进行理论计算,并与实验峰值平均值作对比,结果发现相对误差不大,说明所用的计算承载力方法是可行的.

To investigate the calculation method of large-scale concrete compact tension specimens＇ maximum bearing capacity,six kinds of different size incison concrete compact tension experiment data were applied in the paper.The stress intensity factors of the concrete specimens with different sizes were calculated,showing size effect.For different size specimens,the computation method of structure bearing capacity was presented through the stress intensity factor＇s computation formula and the fracture criterion.The values calculated using this method were compared with the testing results,and the relative errors are not large.In short,this method is feasible for calculating the maximum bearing capacity of this kind of concrete structure.