ANALYSIS OF STRUCTURES WITH SOME UNCOMMON IRREGULARITIES- TYPICAL FINDINGS

Architects are focusing on planning high-rise structures with various irregularities, there is a great deviation from the expected simple and symmetric configuration to irregular configurations. The IS 1893:2016 has detailed many vertical as well as horizontal irregularities in structures. Many technical papers are available on stiffness irregularity, mass irregularity, diaphragm irregularity, torsional irregularity, however no much research work is available in literature on some uncommon irregularities such as vertical geometric irregularity, floating or stub columns, non-parallel lateral force system. Thus there is a great need to investigate development of forces, displacements and storey drift in the structures with these irregularities and understand the limitations and scope for seismic safety of these structures. The analyses of structures with vertical geometric irregularities have clearly demonstrated that the column location and its position from the plane of major stiffness variation play important role in development of forces and displacements. The outcome of this research paper shall prove to be beneficial while designing structures with vertical geometric irregularity.