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...Structural dynamics dynamic force and system conventional analysis is based on the concept of statics which can be derived from newton s st law motion this states that it necessary for some to act in order initiate a body at rest or change velocity moving considers external forces joint displacements static resisted only by stiffness structure therefore resulting do not vary with time an extension study loads respond them its as well inertia damping nd forms basic principle resultant equal mass times acceleration induced just special case also although much less used practicing engineers than use has gradually increased worldwide acceptance importance present being tall buildings bridges towers due wind earthquake marine offshore structures subjected wave current vortex etc varying are called dead live have same magnitude direction throughout their application thus however there several examples such those caused water vehicle impact blast ground like simple representation physical sys...