Research Article
Aug 1963
Natural Periods of Vibration of Buildings
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VIEW THE REPLYAuthors: G.W. Housner and A.G. BradyAuthor Affiliations
Publication: Journal of the Engineering Mechanics Division
Volume 89, Issue 4
Abstract
The measured periods of vibrations of a large number of buildings are used to compare the merits of existing formulas and of equations derived using a rational approach. It is concluded that no single, simple, empirical equation will give reasonably accurate estimates for the periods of buildings having shear wall characteristics. The calculated periods of steel frame buildings are found to be proportional to the square root of the number of stories rather than directly proportional as is usually assumed. However, observed periods of such buildings indicate that the steel frame alone would contribute only about 25% of the effective stiffness. The dependence of the period on the flexibility of the floor girders is also demonstrated using a digital computer. Calculations show that these buildings behave essentially as if they had rigid floor girders, although the girders of the steel frames themselves are very flexible, so far as the period of vibration is concerned. Additional studies of the natural periods of actual structures are recommended.
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Published In
Journal of the Engineering Mechanics Division
Volume 89 • Issue 4 • August 1963
Pages: 31 - 68
Copyright
© 1963 American Society of Civil Engineers.
History
Published in print: Aug 1963
Published online: Feb 3, 2021
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G.W. Housner
Prof. of Engrg., California Inst. of Tech., Pasadena, Calif.
A.G. Brady
Graduate student Civ. Engrg., California Inst. of Tech., Pasadena, Calif.
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