组合试验法推求混凝土拉伸软化曲线的研究

Tension Softening Curve of Concrete Using Combination Test

针对混凝土拉伸软化曲线测定难度大、成功率低的问题,提出了一种新的确定混凝土拉伸软化曲线的方法——组合试验法,即通过两种简易的混凝土基本试验混凝土轴心抗拉强度试验和三点弯曲断裂试验,结合简单的数值计算,确定混凝土拉伸软化曲线。为验证组合试验法的准确性,通过算例获得了混凝土拉伸软化曲线,并与混凝土直接拉伸试验获得的拉伸软化曲线进行了对比分析。结果表明,组合试验法获得的拉伸软化曲线的精度满足工程要求,且该方法简便,具有较广的应用前景。

In view of the problem that concrete tensile softening curve measurement is difficult and low success rate,this paper proposes a new method to determine the concrete tensile softening curve—the combined test method,which is through two kinds of simple concrete test：concrete axis tensile strength test and three point bending fracture test.Combined with a simple numerical calculation,it determines the concrete tensile softening curve.To verify the accuracy of combined test method,the concrete tensile softening curve is obtained through an example.Compared with direct tensile test of concrete,the results show that the accuracy of combined test method for tensile softening curve satisfy the engineering requirement,and the method is simple with a broad application prospect.