ANALYSIS OF IRREGULAR HIGH RISE STEEL BUILDING WITH AND WITHOUT FLOATING COLUMN UNDER SEISMIC FORCES

The current analytical study was carried out to comprehend the behaviour of steel framed structure in the presence of mass irregularity and floating column. For this, different steel framed Structures were modelled which entails 15 storey. The plan of the building had 7 bays in both the directions i.e. X and Z direction and each bay had a span of 6m x 5m whereas, the height of each floor was taken as 3.6 m. Steel framed building was considered as commercial building, therefore all the loadings i.e. dead loads (as per IS: 875: Part-1) and live loads (as per IS: 875: Part-2) were considered in the same manner. The dynamic seismic analysis had been performed while using Response Spectrum Analysis as per requirements of the seismic code i.e.1893:2016 which states that every structure shall be designed with dynamic seismic analysis if the structure falls under seismic zone IV. In the end it can be concluded that the steel framed structure is affected with mass irregularity and floating column under dynamic seismic analysis as the forces and moments have been increased.