混凝土轴拉弹模衰减规律及损伤模型试验研究

为研究混凝土轴拉弹模衰减规律,采用循环加载的试验方法,获得混凝土轴拉应力~应变全曲线,并对试验过程中的弹模衰减现象进行描述,拟合弹模衰减的演化曲线。根据弹模损伤定义,建立损伤模型进行试验研究,进而结合应力~应变全曲线,得到混凝土轴拉损伤演化方程,建立了以弹模定义损伤变量的试验确定方法。所得成果为混凝土损伤过程研究提供参考。

Experimental study on axial tensile elastic modulus degradation law and damage model of concrete

In order to study the axial tensile elastic modulus degradation law of concrete， the full curve of the concrete axial ensile stress-strain is obtained by the method of cycle loading experiment， and then the degradation phenomenon of the elastic modulus during the experiment is described and the evolution curve of the elastic modulus is fitted as well. In accordance with the definition of elastic modules damage， the damage model is established for the experimental study. Furthermore， based on the full stress-strain curve， the evolution equation for the axial tensile damage of concrete is got， thus the method for determining the damage variables with the definition of the elastic modulus is established. The achievement obtained herein can provide a reference for the study on the damage process of concrete.