作　　者： ; ; ;

机构地区： 东南大学土木工程学院

出　　处： 《建筑结构学报》 2014年第8期142-150,共9页

摘　　要： 介绍了一种针对半刚性连接钢框架的直接分析法,该方法可以同时考虑结构和构件的初始缺陷、几何非线性(包括P-Δ,P-δ效应)、材料非线性以及半刚性连接(支座)对结构受力性能的影响。建立了可同时考虑初始缺陷、半刚性连接以及塑性铰的弯曲稳定函数单元(CSF单元),推导了CSF单元的二阶单元刚度矩阵,并扩展为三维单元刚度矩阵。采用弹簧单元对半刚性连接和塑性铰单元的非线性行为进行了模拟,确定了塑性铰出现的判断准则以及弹簧刚度的取值,定义了结构破坏准则。利用NIDA程序对3组半刚性连接框架结构进行了直接分析,并与试验结果进行了对比。对比分析表明:利用NIDA程序得到的结果与试验结果吻合较好,验证了直接分析法对半刚性连接钢框架进行结构分析的有效性和可靠性。 The direct analysis method used to analyze semi-rigid steel frames is introduced,which can take into account many factors influencing structure mechanical performance,including initial imperfection of structure and members,geometrical nonlinearity( P-Δ,P-δ effects),material nonlinearity and semi-rigid connections. The curved stability function element( CSF element) is built to take into account initial imperfection,semi-rigid connections and plastic hinge,and derivate the second-order element stiffness matrix and extend the spatial element stiffness matrix.The nonlinear behavior of semi-rigid connections and plastic hinge are simulated by the spring element. Judgment criterion of plastic hinge and spring stiffness values are determined,and structure failure criterion is defined. Three semi-rigid steel frames were directly analyzed by the program NIDA,and the results of NIDA were compared with test results. It is indicated that the results of NIDA are in good accordance with test results,and the effective and reliability of the direct analysis method for semi-rigid steel frames are verified.

关 键 词： 半刚性钢框架 弯曲稳定函数单元 初始缺陷 塑性铰单元 直接分析法 非线性分析

领　　域： [建筑科学]