Abstract
The techniques used in predicting the time history response of structural systems subjected to a dynamic environment have seen major modifications in the last 10 years. The increased capabilities of digital computers have been the impetus for improved numerical techniques and computer codes. Direct decomposition methods for the solution of linear equations have replaced iterative techniques like relaxtaion and Gauss-Seidel. Eigenvalue and eigenvector extraction methods like inverse iterations, Q/R, L/R, and A/P have received a great deal of attention, and many standard computer codes utilizing these methods are available. The present generation of computers offers the user a large variety of hardware and software options. The CDC 6600 with a 60-bit word and 130 000 core words is an ideal machine for large dynamics analysis programs, while the IBM-360 series with a 32-bit word size is inadequate and double precision must be used. Computer programs such as STARDYNE, NASTRAN, SAMIS, and SRUDL are capable of solving dynamic structural problems with thousands of degrees of freedom. It is important for the analyst to understand their capabilities and shortcomings in order to make effective use of them.
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