The book gives the formulation & algorithms (software) for the seismic analysis & design of structures using IS (Indian Standards) codes of practice. It is proposed to develop module-based programmes for the design of different components of the structure incorporating the provisions of relevant Indian standards. These developed software will be available on high performance systems to carry out large scale simulations. The work will help to improve the seismic design of buildings ,bridges, utilities & other infrastructures in the country by way of reducing the impacts of earthquakes.