ABSTRACT
The previous chapters dealt with structures subjected to static forces producing displacements that do not vary with time. We now consider dynamic problems, in which the forces are time dependent and cause vibration of the structure; hence, it is necessary to take into account the forces produced by the inertia of the accelerating masses. For this purpose we use Newton’s second law of motion, which states that the product of the mass and its acceleration is equal to the force. In practice, dynamic loading is produced by seismic forces, nonsteady wind, blast, reciprocating machinery, or impact of moving loads.
