Title: Computer method for stability analysis of plane frames
Abstract: Axial loads decrease the load carrying capacity of a structure below that corresponding to flexural action alone (ie, a reduction in strength) and also increase the deformation (ie, a reduction in stiffness). A frame can become unstable at loads below those producing instability in the individual members. Evaluation of elastic critical loads and second order stability analysis are thus important in the design of both braced and unbraced frames. A general purpose computer program for the computation of the elastic critical load factor, lambda(sub)e, of both concrete and steel frames is developed. The program is based on direct stiffness analysis, including the non linear effects of axial forces in members and the p-delta effect. Section 1 of the report reviews the concept of second order analysis and elastic critical load analysis of frames and the methods available for carrying them out. Section 2 discusses the program elcaf. In section 3 some applications of the program are demonstrated. Input specifications and sample input and output are included as appendices.
Publication Year: 1985
Publication Date: 1985-01-01
Language: en
Type: article
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