COMPDYN 2017 6 th ECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering M. Papadrakakis, M. Fragiadakis (eds.) Rhodes Island, Greece, 15–17 June 2017 ON TIME HISTORY ANALYSIS WITH STEPS LARGER THAN THE STEPS OF EARTHQUAKE RECORDS INDEPENDENT FROM THE FREQUENCY CONTENTS Aram Soroushian International Institute of Earthquake Engineering and Seismology (IIEES) No. 21, West Arghavan, North Dibajee, S. Lavasani (Farmaniyeh), Tehran 19537, Iran e-mail: a.soroushian@iiees.ac.ir Keywords: Time Integration, Digitized Excitation, Computational Cost, Accuracy, Errors Control, Response Frequency Content. Abstract. 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 implemen- tation 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 eas- ily estimate the parameter prior to the analysis. In this paper, the computational cost reduc- tion 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 en- hancement is the error control comment traditionally recommended in the practice. As ob- served in numerical tests, by implementing the enhanced technique, besides further clarity, the time integration analyses can be more efficient compared to traditional analyses. 1432 Available online at www.eccomasproceedia.org Eccomas Proceedia COMPDYN (2017) 1432-1443 © 2017 The Authors. Published by Eccomas Proceedia. Peer-review under responsibility of the organizing committee of COMPDYN 2017. doi: 10.7712/120117.5503.17962