Analyzing the Effect of Mass Irregularity and Floating Column on High-Rise Steel Framed Structure with Wind Analysis

The analysis and design of the structures have become a difficult task now days due to presence of different kinds of irregularities in it. To make this as a simple task, the evaluation of performance of these structures is carried out in the professional analysis and designing tool such as Bentley's Staad. Pro, e-tabs, SAP etc. Out of all the irregularities of structures, Mass irregularities and elevation irregularities (having floating column) have become the most common one. Therefore, in present study, 15 and 20 Storey buildings were adopted while introducing floating columns at the upper floors and Mass irregularity at different floor throughout its height. Various vertical loads were taken from the IS codes and along with it, wind forces were applied on the structures. From the results, it has been concluded that the forces and moments increases when the heavy mass is introduced, but if the heavy mass is placed in the upper storeys, the forces and moments becomes higher than that of a building having heavy mass in the lower floors. Displacement of the column decreases as heavy mass increases the lateral capacity of the structure by giving the addition stability due to increase in total vertical load.