In some parts of world, hilly area is more prone to seismic activity; e.g. northeast region of India. A scarcity of plain ground in hilly area compels the construction activity on sloping ground. Hill buildings constructed in masonry with mud mortar/cement mortar without conforming to seismic codal provisions have proved unsafe and, resulted in loss of life and property when subjected to earthquake ground motions. The economic growth and rapid urbanization in hilly region has accelerated the

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... l estate development. Due to this, population density in the hilly region has increased enormously. Therefore, there is popular and pressing demand for the construction of multistory buildings on hill slope in and around the country. The buildings on a sloping terrain undergo severe torsion under earthquake excitations due to considerable variation in the height of ground floor columns. Buildings constructed on hill slopes are highly unsymmetrical in nature.The building considered for analysis is an eight storey RC framed building. It is in zone IV and is on sloping grounds ranging from 0° and 10°. Hence there will be geometrical and vertical irregularity in a building.