Portal Frame Stability with Nonproportional Loadsby Siva Prasad Darbhamulla, Old Dominion Univ, United States,
Zia Razzaq, Old Dominion Univ, United States,
Abstract: An inelastic theoretical study of the effect of various load paths is conducted on the in-plane behavior of an imperfect portal frame with flexible joints. The loading consists of concentrated moments and axial loads at column tops. Imperfections include column initial crookedness and residual stresses. A rigorous analysis is carried out while using an elastic-perfectly-plastic material law including elastic unloading. A comparison of some results is also made to those based on ignoring material unloading. The strength of the nonporportionally loaded portal frames studied is found to be substantially less than that of the frames loaded proportionally. New insight is also gained into the frame behavior.
Subject Headings: Axial loads | Frames | Steel structures | Structural stability | Elastic analysis | Structural behavior | Joints | Concentrated loads
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