A staircase is an integral part of a building. It is a series of steps arranged in an order so that people can go from one floor of a building to another . The stair should be as per standard design principles and constructed in a such a manner that people can negotiate the steps with ease.
In seismic zones foundations are subjected to additional forces due to earthquakes. This will depend on the area and intensity of the earthquake. Design should take into consideration these forces.