高强混凝土框架节点非线性有限元分析

混凝土采用等效单轴应变的增量式正交异性分析模型，考虑裂面效应的反复加载本构关系并做了适当的修改。钢筋的应力应变关系中考虑了反复荷载下的Baushinger效应且做了相应的简化。在粘结滑移模型中引用了斜压杆单元和反复荷载下的粘结——滑移关系，并做了局部的变化。在此基础上编制了二维非线性有限元程序，并应用所编程序对四榀高强混凝土框架边节点进行了分析，研究框架节点的滞回曲线、延性、屈服强度、极限强度等性能。结果表明，计算结果与实测结果符合良好。

Nonlinear Finite Element Analysis on High Strength Concrete Beam-column Joint

The incremental orthotropic model based on equivalent uniaxial strain and the constitutive relation under cyclic loading in consideration of the effect of cracked section for modeling of concrete were used.In the stress-strain relationship of steel,the Baushinger effect was considered.A new bond element and relationship under reversed cyclic loading proposed by Pro-teng Zhiming were adopted.A two dimensional finite element program was developed for analyzing high-strength concrete beam-column joint under reversed cyclic loading.The behavior of high strength concrete beam-column joint,such as hysteresis loop,ductility,yield strength and limit strengh was studied.The calculated and measured results were shown to be in good agreement.