COMPARATIVE STUDY OF BRACING SYSTEMS FOR IRREGULAR TALL STEEL STRUCTURES BASED IN DIFFERENT CITIES

Karthik K Vidyaranya, Shiva Kumar KS

Abstract: In a high-rise steel building, bracing system is an essential commodity for inadequate lateral reinforcements in the structure. Therefore, bracing system is a necessary solution for these lateral deflections caused by lateral loads. The resistance to wind and seismic load is one of the factor for the sustainability of the high rise building. For present study, plan irregularity with (A/L) ratio of (40/65) = 0.62 is considered as per IS 1893 (Part 1): 2002. In this study, the steel structure is assumed to be at 4 different cities with different seismic zones those cities are Agra, Bengaluru, Mumbai and Roorkee with five types of bracing systems. All cities are compared with an unbraced model of Roorkee city. A G+14 structure is analyzed for seismic zone II, zone III and zone IV as per IS: 1893-2002 using STAAD pro software. Dead and live loads are sustained by beams and columns whereas; the lateral loads are carried by bracing systems only. The bracings are provided at every corner of the structure. The structure is studied for nodal displacements in X-direction and Z direction in all the floors, axial force and bending moment for the ground level column is compared and finally, drift index and corresponding percentage change in top roof is calculated

Keywords: Lateral Loads, Bracing Systems, Axial Force, Bending Moment, Drift Index.

DOI: https://doi.org/10.15623/ijret.2016.0507068