圆柱体横向劈拉测定混凝土抗拉强度方法的研究

RESEARCH ON THE TEST OF THE TENSILE STRENGTH OF CONCRETE CYLINDER BY TRANSVERSE CUTTING METHOD

采用有限元的方法计算分析了混凝土圆柱体在受横向均匀线荷载和非均匀线荷载时其横截面上的应力状况。结果显示,在横向均匀线荷载和非均匀线荷载作用时,圆柱体横截面90%以上的面积为拉应力,且拉应力大小相对比较均匀。经试验证明,混凝土圆柱体的横劈名义强度与混凝土的抗压强度、立方体及圆柱体纵劈强度有很好的相关性,尤其当压具圆心角为90°时,上述关系更为理想。因此,理论分析与试验结果都表明,可以采用横劈的方法得到混凝土的强度。

Stress distribution at cross section of transverse uniformly distributed load and non-uniformly distributed load applied to concrete cylinder by finite element method is analyzed. The results show that the area of cress-sectional tensile stress exceeds 90 percent, and the value of tensile stress is relatively uniform when transverse distributed load and negate mean distributed load are applied to cylinder. The test shows that nominal transverse splitting strength of concrete cylinder is well correlated to the concrete cube strength and splitting strength of cube and cylinder, especially, above interrelation is more ideal when hold-down central angle is 90°.So both theoretical analysis and test show that concrete strength can be obtained by transverse cutting method.