Effects of Vertical Irregularity in Steel Frame with Shear Linked Steel Bracings

Abstract

This paper deals with the irregular profile of braced steel frame building along the vertical direction with shear link bracing systems. The underlying fact of the paper is the effect of the seismic force in braced frames with different types of irregularities including geometric irregularity, column discontinuity, and overhanging mass. For each successive model, the position of shear link bracings has been fixed to make the study effective. This study has investigated the vulnerable effect of irregular profiles in steel frame buildings. To attain the nonlinear property of each element of the frame, the pushover analysis method along with the equivalent static force method has been adopted for the present study. UBC97 code has been used here for linear static analysis while the parameters for nonlinear static analysis are authenticated from FEMA356. Investigations on different frames exhibit that regular profile with symmetry in mass is more efficient while using overhanging mass is detrimental as the formation of nonlinear hinge occurs at minimum load in the model with overhanging mass compared to other frames.

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