Seismic analysis is related to calculation of the response of a building or other structures under earthquakes. It is a part of the process of structural design which includes earthquake engineering or structural assessment and retrofit in regions where earthquakes are prevalent.During earthquakes many of the buildings collapse due to lack of understanding of the inelastic behaviour of structure. Elastic analysis gives only elastic capacity of the structure and indicates where the first yielding occurs. It cannot give any information about redistribution of forces and moments and failure mechanisms.For study of inelastic behaviour of structure nonlinear analysis is necessary. The development of rational methodology that is applicable to the seismic design of new structures using available ground motion information and engineering knowledge, and yet is flexible enough to permit the incorporation of newtechnology as it becomes available has been supported for some time now. This is the focus of several major research and development efforts throughout the world. In the majority of cases nonlinear analysis is used.
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