“Analysis of a regular and irregular geometry structure considering floating columns at different floors considering lateral forces”

Now a days, in India having open first story in urban multi-storey building as an unusual feature. Primarily this space is adopted for parking purpose or used for reception lobbies in first storey, at the time of earthquake total seismic base shear is experienced by a building depend on its natural period, this seismic force distribution of building is dependent on the distribution of mass and stiffness along the height of building. In India there are many places where floating columns are used above the ground floor of building. In that structure some special girder are used like I- girder, etc. this girder transfer the load easily to the ground and there are more space available for parking purpose or for large hall purpose in ground floor. In earthquake zone the girders are designed with care and according to condition. In this beam load of floating column is act as a point load or concentrated load. In this analysis the floating column is pinned; so structure made monolithic structure. In this study we are analyzing a regular and irregular structure considering seismic zone II and V, soil type soft and Hard using analysis tool staad. pro. to determine the variation in structures in terms of forces, displacement and drift.