混凝土直拉应力—应变全曲线试验研究及下降段的预测

混凝土受拉应力-应变全曲线是材料的基本力学性能之一,鉴于其获得需要完备试验条件,本文提供一种简易试验装置测得混凝土直拉应力-应变全曲线；由于测试过程中下降段数据较少,采用灰色预测理论,MATLAB编程建立GM(1,1)模型获得下降段,为工程现场提供一种简单易行获得混凝土直拉下降段的方法,便于混凝土结构受力全过程分析.

Experiment on concrete complete direct tensile tress-strain curve and gray prediction of the descending stage

Concrete tensile stress-strain curve is one of the basic mechanical properties of the material. To gain complete stress-strain curve of axial tension need complete test conditions, this article provided a simple test device to measure concrete direct tensile stress-strain curve. Due to the shortage of the descenting stage data in testing process,GM(1,1) model was established to forecast descenting stage on the basis of the gray system theory, which provide a simple menthod to gain the descenting stage of direct tensile at engineering site to convenient for analysis of the whole stressing process of concrete structure.