混凝土截面抵抗矩塑性影响系数的理论分析

Theoretical Analysis of The Plastic Influence Coefficient of Concrete under Bending Moment

采用上升段与下降段均为线性的混凝土拉伸软化应力应变曲线,根据平面假设推导出了素混凝土矩形截面梁的截面弯矩与截面塑性发展深度的关系,得到了混凝土截面抵抗矩塑性影响系数的解析表达式.结果表明,混凝土强度等级越高,截面塑性发展深度越小,塑性影响系数也越小.

Based on the plane assumption and a simplified bi-liner stress and strain relationship of concrete under uniaxial tension, the relationship between bending moment and plastic development depth was deduced. Furthermore, a analytical formula of the plastic influence coefficient of concrete under bending moment was obtained in this paper. Computational results indicated that the higher the concrete strength,the smaller the developed plastic zone and the correspondent plastic influence coefficient.