Period Formulas for Concrete Shear Wall Buildings
Publication: Journal of Structural Engineering
Volume 124, Issue 4
Abstract
Most seismic codes specify empirical formulas to estimate the fundamental vibration period of buildings. Evaluated first in this paper are the formulas specified in present U.S. codes using the available data on the fundamental period of buildings “measured” from their motions recorded during eight California earthquakes, starting with the 1971 San Fernando earthquake and ending with the 1994 Northridge earthquake. It is shown that current code formulas for estimating the fundamental period of concrete shear wall buildings are grossly inadequate. Subsequently, an improved formula is developed by calibrating a theoretical formula, derived using Dunkerley's method, against the measured period data through regression analysis. Also recommended is a factor to limit the period calculated by a “rational” analysis, such as Rayleigh's method.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 124 • Issue 4 • April 1998
Pages: 426 - 433
Copyright
Copyright © 1998 American Society of Civil Engineers.
History
Published online: Apr 1, 1998
Published in print: Apr 1998
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