Comparative Study on Seismic Analysis of RC Structure with and Without Floating Column Including Lateral Load Resisting Systems

Abstract

: Soft storey, vertical or plan irregularity, floating column, and high loads are all common features of modern multi-story structures. In metropolitan India, these kinds of buildings are becoming increasingly popular. According to the findings of previous earthquake research, most RC buildings with such flaws are extremely undesirable in seismically active locations. These effects occurred as a result of a variety of factors, including nonuniform mass distribution, stiffness, and strength. This study uses the software STAAD PRO V8i to discuss the seismic analysis of a multi-storey G+7 building with floating column built in seismically active area, observing its responses to external lateral force generated on the building in seismic zone 5,including different lateral load resisting systems. The structure is represented in ten different model cases. Model 2 contains a floating column structure, Model 3includes increased column size on the ground floor. Models 4, 5, 6 and 10 contain different types of bracing (type 1, type 2, type 3 and type 4) which are installed one after another from the ground floor to the top floor and modelled separately. Shear core/shear tube is introduced in model 7 and 9 with thickness 0.2m running from ground to top. Shearwalls of 4 typesareintroducedinmodel8withthicknessofwallas0.3mrunning from ground floor to top. Thus, alternative measures involving improving non uniform distribution in irregular buildings, such as multi storey buildings with floating columns, were highlighted, and the safer design of such buildings in seismically active areas was recommended, taking into account the results observed from base shear, storey drifts, storey displacements, bending moment using Equivalent static method. As a consequence of the results, we determined that the introduction of a single bracing/strut contributes to the maximum reduction in shear force and bending moment compared to all model cases, Shear core structure withstands the highest seismic load of any model, When the columns are completely removed to create a floating column design, the % increase in maximum drift is 67.65%, indicating the minimum lateral resistance compared to all model cases.