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本文介绍一种面向计算机和手算的程序,使利用一阶公式的手段可以直接完成不对称建筑结构的二阶分析。这是通过模拟该结构的几何刚度获得的。把该结构看作一假想柱含有负横向刚度和负扭转刚度特征值。本文介绍的近似法,适用于某些非耦合的结构形式。此近似法利用合成刚度中心和侧移子结构法,也可用于不对称结构的弹——塑性分析。文中提供了数值分析的实例,说明此法的应用。
This article introduces a computer-oriented and hand-based program that makes it possible to use a first-order formula to directly complete the second-order analysis of asymmetric building structures. This is obtained by simulating the geometric stiffness of the structure. The structure is seen as an imaginary column containing negative lateral stiffness and negative torsional stiffness eigenvalues. The approximate method introduced in this paper is applicable to some uncoupled structural forms. This approximation uses the composite stiffness center and sideshift substructure method, and can also be used for the elastic-plastic analysis of asymmetric structures. Examples of numerical analysis are provided in this article to illustrate the application of this method.