不同应变速率CFRP约束混凝土单轴受压本构关系的试验研究

Experimental research on uniaxial compressive constitutive relations of CFRP confined concrete under different strain rate

针对目前我国尚无CFRP约束混凝土方柱在不同应变率下的动态试验研究,设计了一套能够满足不同应变速率的动态单轴受压试验装置,并对83个碳纤维布约束混凝土在不同应变速率、不同包裹层数、不同混凝土强度下进行了单轴受压试验研究,得到了不同应变速率下CFRP约束混凝土的轴向应力应变关系。试验结果表明,不同应变率下其应力应变曲线的形状大致相同,随着加载速率的提高,CFRP约束混凝土的抗压强度也也随之提高。

There has been dynamic test research on CFRP confined concrete square columns with different strain rates, a dynamic uniaxial compression test device was designed to meet the test requirment for different strain rates. And the uni axial stress strain relationship of CFRP confined concrete was obtained by the uniaxial compression test on the 83 CFRP confined concrete under different strain rates, different number of parceled layer and different concrete strength. The test results show that the shape of the stress strain curves at different strain rates are roughly the same, with increased of loading rate,the compressive strength of CFRP confined concrete increases.