Seismic analysis of various combinations of irregularities in a structure

Abstract One of the important governing parameters of the seismic performance of a structure is its irregularities. There are many types of irregularities such as geometric irregularities, mass irregularities, irregularities due to varied column shapes and dimensions, etc. It is very evident that these irregularities are seen in every project in this contemporary world. We have to acknowledge that there is a tremendous scope for these irregularities to exist in combinations. Although there has been extensive literature on various irregularities and their combination, it was evident that authors restricted themselves to limited combinations. This paper investigates the seismic response of a multi-storeyed building induced with combinations of irregularities by varying the seismic parameters using STAAD Pro. Various configurations of mass and torsion irregularities in combination with other irregularities were induced in the structure and results of seismic response using response spectrum methods were assessed to arrive at novel solutions.