砼轴向拉伸断裂能的测试研究

Experimental Study of Fracture Energy of Concrete in Uniaxial Tension

通过轴向拉伸试验,给出了截面为10cm×4cm的砼轴向拉伸应力～应变全曲线。全部试验在自行设计、加工组装的刚性辅助加载装置上进行,该刚性加载辅助装置与普通压力试验机配套使用。采用峰点卸荷的方法,成功地测定了试件截面为10cm×4cm的砼断裂能。避免了砼轴向拉伸试件无法预先确定断裂位置的困难。

Though the test for concrete in uniaxial tension,the complete stress-strain curves are ob- tained for the section of 10cm×4cm.All the experiments are carried out on the self-designed and manufactured auxiliary stiff loading device.This device forms a complete set with the common com- pression testing machine.The peak-point-unloading method is adopted and the fracture energy G_F for concrete of the section 10cm×4cm is determined.