钢纤维钢筋高强混凝土柱的变形与延性计算

DEFORMATION AND DUCTILITY ANALYSIS OF STEEL FIBER REINFORCED HIGH STRENGTH CONCRETECOLUMN

采用简化的钢纤维混凝土应力应交关系，考虑截面的应变协调因子推导出曲率延性系数的计算公式。根据压弯构件曲率分布规律，将曲率分布简化为二段和三段直线分布，推导出各段长度和对应荷载、挠度的计算公式，提出了荷载一挠度理论曲线计算方法。与试验结果对比表明，延性系数β△=△ｕ／△ｙ以及荷载一挠度理论曲线均与试验结果吻合良好。

By use of a simplified stress-strain curve of steel fiber concrete and coefficient ofsection's coordinated strain, formulas for curvity ductility were derived. According to the curvitydistribution of the column, the curvity distribution was assumed to be a broken line, then thelength of the straight line and corresponding load and displacement can be calculated. Themethod of calculating theoretical load-deformation curve was presented. Comparison betweentesting results and calculating results indicated that the formulas for ductility coefficient andtheoretical load-deformation curve are well verified.