In the preceding chapter we studied the response of a single degree-of-freedom system with harmonic loading. Through this type of loading is important, real structures are often subjected to loads that are not harmonic. In this chapter we shall study the response of the single degree-of-freedom system to a general type of force. We shall see that the response can be obtained in terms of an integral that for some simple load functions can be evaluated analytically. For the general case, however, it will be necessary to resort to a numerical integration procedure.
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