Effect of planar irregularity of linear static and dynamic analysis

A structure that has difference between centre of mass and centre of rigidity is called an Irregular building. Among the different types of irregularities in the building, this paper focuses on Planar Irregularity. Planar irregular buildings are quite commonly constructed Multi-storey structures with the present construction capabilities and space requirements. These multi storeyed buildings are subjected to most dangerous seismic waves during earthquakes. The main reason found that RCC building failure is caused due to Irregularity in its plan dimension and lateral force distribution. This paper tries to study the linear behavior of buildings under static and dynamic earthquake excitation. To investigate the analytical behavior of buildings with increasing irregularity under Linear Dynamic (Response Spectrum) Analysis for different Excitation angles. Efforts are made to bring out the scope of rationalization in IS code provisions for dynamic analysis on irregular structural. A regular building, ‘T’ shape, ‘L’ Shaped and Fan shaped of 13 storeys of 3 m height are considered for this paper. The buildings are modelled and analysed using MIDAS Gen 2019 (V2.1) and IS Code 1893:2002 (part 1) is considered.