空间框架结构非线性分析的简化数值方法  

A SIMPLIFIED NUMERICAL METHOD FOR NONLINEAR ANALYSIS OF SPACE FRAME STRUCTURES

作　　者：吴胜兴[1] 康庆[1] 

机构地区：[1]河海大学土木工程学院,南京210098

出　　处：《工程力学》2005年第6期21-27,共7页Engineering Mechanics

基　　金：国家自然科学基金资助项目(50278031)

摘　　要：钢筋混凝土框架结构正常使用期间是带裂缝工作的,合理的分析方法应考虑因开裂引起的非线性。在杆系结构有限元基础上,根据构件截面广义应力-应变关系,提出了空间框架结构非线性分析的简化数值方法——网格-等效截面法。该方法能考虑材料非线性,混凝土开裂导致构件有效刚度降低,混凝土徐变和加载历程等影响因素。给出了相应的实施步骤,并采用通用有限元软件ANSYS部分功能,自编主体计算程序的混合编程方法编制了程序。通过考题,程序编制方法正确,计算精度满足工程要求。最后,采用程序对荷载和温度作用下某超长框架结构进行了计算。Reinforced concrete space frames have cracks under normal service condition. A reasonable analysis must consider nonlinearity due to cracking. Based on the finite element analysis of member structures and the generalized stress-strain relation of member section, a grid-equivalent section method is put forward to perform nonlinear analysis of space frame structures. Factors including material nonlinearity, effective member stiffness degradation induced by concrete cracking, concrete creep and loading course are considered. The corresponding implementation procedures are given in the paper, and the program is coded by hybrid programming method. Partial functions of ANSYS are used. Computational results of two frames verify the program and the accuracy of results is satisfactory. A super-long frame structure subjected to load and temperature is also studied.

关 键 词：钢筋混凝土 空间框架结构 非线性分析 网格-等效截面法 混合编程 

分 类 号：TU375[建筑科学—结构工程]