钢筋混凝土框架顶层中节点的非线性有限元分析

Nonlinear Finite Element Analysis for Interior Top-of-Column Joints of R. C. Frames

本文应用非线性有限元法分析了钢筋混凝土框架顶层中节点的非线性性能。弹塑性本构关系是建立在Ｄａｒｗｉｎ的模型和Ｃｏｌｌｉｎｓ的斜压场理论基础上，并考虑了混凝土等效单轴受拉软化、受压软化、及钢筋和混凝土之间的粘结滑移，据此编制了非线性分析程序。对顶层中节点在单调荷载作用下裂缝的发展、受力性能及变形特征进行了分析，并和试验结果进行了比较。

The nonlinear properties of the interior top--of--column of R.C.frames have been discussed through the nonlinear finite element analysis method given in this paper. The elastoplastic constitutive relation has been developed based on the Darwin' S model and the Coffins I diagonal compression field theory,in which the tension softening and the compression softening under equivalent uniaxial load as well as the bond--slip between reinforcement and concrete are taken into consideration. By which,the nonlinear analysis program is compiled. Besides,the crack extension,the mechanical properties and the deformation behavior of the interior joints under monotonic load are discussed,and compared with the experimental results.