钢纤维自应力混凝土受拉应力-应变全曲线试验研究

Experimental research on stress-strain full curve of steel fiber reinforced self-stressing concrete in tension

通过直接拉伸试验研究了不同自应力等级下的钢纤维自应力混凝土的受拉应力-应变全曲线特征.从方便计算的角度上建议上升段采用比例方程表示,下降段简化为以拐点分界的两部分直线.钢纤维自应力混凝土抗拉强度为混凝土基体的抗拉强度与自应力值之和;曲线下降段拐点的应变定义为500×10-6,并提出拐点应力计算公式.这种在试验基础上的简化,方便了钢纤维自应力混凝土结构的应力和应变分析.

Based on the direct tension test, the characteristics of tension stress-strain full curves of steel fiber reinforced self-stressing concrete were investigated. For the convenience of calculation, ascending branch was simplified into a direct ratio formula and descending branch was simplified into two straight lines divided by knee point. The whole tension strength of steel fiber reinforced self-stressing concrete is a combination of tension strength of matrix and the self-stress value; the strain of knee point is defined to 500×10-6, and a formula for stress of knee point is suggested. The simplified curve based on the experiment provides a convenience for the analysis of stress and strain of steel fiber reinforced self-stressing concrete structures.