约束高强混凝土受弯构件非线性分析

提出一个受约束高强度混凝土构件从加载到破坏的非线性分析模式，在基本假定的基础上，讨论了程序编制过程中的各种问题，通过计算给出了弯矩与曲率的关系曲线，从弯矩曲率关系中可以明显看出轴力对混凝土延性的不利影响，当存在轴力时，混凝土的极限曲率大大地减少，在钢筋屈服之后混凝土很快就达到极限压应变，因此构件的延性很差，而当轴力为0时，在钢筋屈服后曲线的下降段很平缓，延性很好，由此可以得出结论：轴力的存在对构件延性是非常不利的。

Nonlinear Analysis of Constrained High-Strength Concrete

Nonlinear full range analytical mode on the constrained high strength concrete is presented and the various problems in the course of programming based on the fundamental presumption are discussed. By working out the calculating program and through the calculation, the line of the moment curvature was obtained. From the line we could obviously discover that the disadvantageous effect of the axial force on the ductility of concrete and the asial force would greatly reduce the ultimate curvature of the concrete,and that when concrete reached the ultimate compressive strain after the yield of steel quickly, the ductility of concrete was very poor. When the axial force was 0, we could see that there was a mild degradation, and the ductility was good. From this we can draw a conclusion that the effect of axial force on the ductility of concrete is very obvious.