RESPONSE OF MULTI-STORY R.C STRUCTURAL FRAMED SYSTEM WITH VERTICAL PLAN IRREGULARITIES SUBJECTED TO SEISMIC EXCITATION

Abstract

Multi-storey buildings are nowadays common in the urban and semi urban region where land value is of huge cost. In regions like Mumbai, Delhi, Chennai etc. have a problem of land, but these regions are considered to be financially rich cities in India. But these regions are seismically active where earthquake forces will govern the design. Generally in these cities buildings are of irregular configuration and vertically irregular, showing unacceptable responses due to seismic forces due to which structure may collapse since Bhuj earthquake is a great example where majority of the structures have been collapsed due to improper flow of inertia forces. Columns and shear walls are the major elements which are responsible to transfer the lateral forces safely to the ground. IS 1893:2002 and 2016 gives the guidelines for plan irregularity and vertical irregularity great concentration have to be given when this situation arises in the seismic prone regions. To study the effect of plan irregularity and vertical irregularity simultaneously 9 different mathematical models have been generated in E-Tabs 2015. To evaluate the seismic response equivalent static analysis and response spectrum method have been used as specified by IS 1893:2002 and 1893:2016.