刚架安定分析中基本弹性变形的直接生成

Direct Generation of Elastic Deformation in Shakedown Analysis of Frames

本文通过对描述结构几何构成的数据进行研究，提出了得到结构全部基本弹性变形的三个准则，从而建立了安定分析中虚力法的前处理模块──基本弹性变形生成模块．其特点是不需要复杂的矩阵运算，容易为工程人员掌握与编程．文中说明了由此三个准则所得到的全部有效弹性变形对安定分析建立残余弯矩平衡方程是充分必要的，并给出了由ＦＯＲＴＲＡＮ７７写成的虚力生成程序模块．

In the shakedown analysis of frames, the elastic deformation can be taken as the virtual displacement of residual moment for establishing its equilibrium equations. At present, the method for obtaining the basic elastic deformation is unsuitable for application.Now in this paper, three rules are given so that all kinds of basic elastic deformation can be directly generated from the data which describe the structural configuration only for elastic analysis of structures. It makes the application of the virtual force method in shakedown analysis easier in practice. The sufficiency and necessity of all kinds of effective elastic deformation generated by the three rules for establishing basic equilibrium equations of residual moment are illustrated, and the virtual force generation programming model written in FORTRAN 77 is given in this paper.