On the Performance of a Technique for More Efficient Time Integration When Applied to Bridge Structures Seismic Analysis

Abstract eng:
The true behavior of structural systems is dynamic, that in many cases can not be simplified to static. The most versatile tool for structural dynamic analyses, is time integration, and, hence, under special attention in the seismic analyses of structural systems, becoming more complicated everyday. Nevertheless, the responses of time integration are inexact and generally being obtained after considerable computational cost. Considering these, besides the digitized nature of ground strong motion records, a technique for considerably reducing the computational cost with small loss of accuracy is recently proposed. With attention to the notion of convergence and its role in numerical analyses, the technique replaces seismic records, with records, digitized at larger steps. The good performance of the technique is displayed in implementation in simple and complicated structural systems analyses. In continuation of the studies, the objective, in this paper, is to examine whether we can successfully implement the technique in time integration of bridges structural systems. The technique is briefly reviewed, and after introdcung a bridge structural system, designed according to the Iranian practice, the finite element model of the system is time integrated, once ordinarily, and then again, after implementing the technique. The numerical results evidence the good performance of the technique, and the essentiality of further inverstigations.

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