考虑混凝土受拉塑性应变割线刚度法的实现

Implementation of a secant-stiffness FEM considering tensile plastic offset in concrete

MCFT是钢筋混凝土剪扭分析中一种有效且重要的分析方法。为了改善基于MCFT的不考虑混凝土受拉塑性应变割线刚度有限元法对滞回剪切板、剪力墙等膜结构的分析能力,需要在分析中引入混凝土受拉塑性应变。通过借鉴前述方法分析结果中混凝土主方向上割线刚度的变化规律和改善混凝土滞回本构程序中应变路径的控制方法,提出了一种新的考虑混凝土受拉塑性应变的割线刚度有限元法。

MCFT（Modified Compression Field Theory） is an effective and important method in analyzing the shear and torsion behavior of reinforced concrete. To improve the capacity of the secant-stiffness FEM（Finite Element Method）,which adopts the MCFT and ignores the plastic tensile offset in concrete,in analyzing the membrane members under reversed cyclic loading,consideration needs to be given to the tensile plastic offset in concrete. A new secant-stiffness FEM incorporating this strain is proposed recently,by learning the secant-stiffness laws of concrete in the principal directions from the results computed by the former FEM and improving the control technics for strain paths in the hysteresis constitutive program for concrete.