Evaluation of Code Period Formula for Concrete MRF Buildings

Rakesh K. Goel, Syracuse University
Anil K. Chopra, University of California - Berkeley

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Copyright © 1997 American Society of Civil Engineers. The definitive version can be found online at http://cedb.asce.org.

NOTE: At the time of publication, the author Rakesh Goel was not yet affiliated with Cal Poly.

Abstract

The empirical formula specified in US building codes for fundamental vibration period of concrete moment resisting frame buildings is evaluated using periods of buildings measured from their strong motion records. The presented results show that the current code formula may lead to fundamental periods that are much shorter than the measured periods. In order to obtain better correlation between measured and computed periods, regression analysis technique has been used. The results indicate that the value of C, in the current code formula should be increased from its present value of 0.030 to 0.035.