ON TIME HISTORY ANALYIS WITH STEPS LARGER THAN THE STEPS OF EARTHQUAKE RECORDS INDEPENDENT FROM THE FREQUENCY CONTENTS

Abstract eng:
Time integration is the most versatile tool in analysis of semi-discretized equations of motion. The computational cost might be considerable, especially when the excitation is available as a digitized record. Concentrating on analysis of structural systems against earthquakes, a technique is proposed in 2008 for reducing the analysis computational cost by summarizing the record of the ground motion. The main parameter to be set before implementation of the technique is the largest period of oscillations with considerable contribution in the response. Apparently, the definition of the parameter is vague, and besides we cannot easily estimate the parameter prior to the analysis. In this paper, the computational cost reduction technique is enhanced to a technique that can be simply implemented regardless of the above-mentioned parameter. The way of implementation is modified, such that the need to the parameter is eliminated without adding any new parameter or ambiguity. The basis of the enhancement is the error control comment traditionally recommended in the practice. As observed in numerical tests, by implementing the enhanced technique, besides further clarity, the time integration analyses can be more efficient compared to traditional analyses.

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