【摘要】 巨型钢框架结构中,组成主结构的杆件截面高度很大,荷载作用下截面剪切变形对杆件承载力和塑性发展的影响不能忽略,即基于弯曲梁理论的截面纤维模型梁柱单元用于此类结构非线性分析时精度并不高。本文基于刚度法将截面纤维模型与Timoshenko梁理论结合,考虑剪切屈服与弯曲屈服相分离建立杆件单元刚度矩阵;通过有限元软件MSC.Marc二次开发,将单元矩阵嵌入到程序中,进行结构的动力非线性分析。采用此单元进行巨型钢框架结构的动力非线性反应分析,可以得到结构中屈服杆件的数量与位置。更多还原

【Abstract】 For the main structure of steel mega-frame structures,the depth of element section is very high.Under some loading,the effect of shear deformation on bearing capacity and plastic development capacity can’t be ignored,so this kind of nonlinear analysis doesn’t get precise result when using the beam-column elements based on the theory of bending beam and section fiber model.In this paper,the element stiffness matrix is established on the basis of the stiffness of section fiber model and Timoshenko beam theory supposing that the shear yield and the bending yield are separatied.The element matrix is embedded into the finite element software MSC.Marc by second development interface used in structural dynamic nonlinear analysis,so the yield element’s quantity and location can be obtained in the structure nonlinear analysis.更多还原