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

Abstract

This paper deals with the irregular pro le of braced steel frame building along the vertical direction with shear link bracing systems. The underlying fact of the paper is the e ect of the seismic force in braced frames with di erent types of irregularities including geometric irregularity, column discontinuity, and overhanging mass. For each successive model, the position of shear link bracings has been xed to make the study e ective. This study has investigated the vulnerable e ect of irregular pro les 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 di erent frames exhibit that regular pro le with symmetry in mass is more e cient 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.