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PART 1: STEEL BUILDINGS
Author(s) -
Barghi Mostafa,
Azadbakht Mohsen
Publication year - 2011
Publication title -
the structural design of tall and special buildings
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.895
H-Index - 43
eISSN - 1541-7808
pISSN - 1541-7794
DOI - 10.1002/tal.540
Subject(s) - infill , masonry , structural engineering , modal analysis , vibration , modal , period (music) , finite element method , frame (networking) , natural frequency , building code , moment (physics) , eigenvalues and eigenvectors , mathematics , engineering , mechanical engineering , chemistry , physics , classical mechanics , quantum mechanics , acoustics , polymer chemistry
Abstract Building design codes generally provide empirical formulas for estimating the fundamental period. These formulas are developed on the basis of observed periods of real buildings during ground motion, and the period is generally expressed as a function of building height, type (frame or shear wall), etc. In this study, the fundamental period of vibration of a series of regular steel‐framed buildings is studied using finite element modelling and modal eigenvalue analysis including the effect of infill. It has been found that when the models do not include infill, the period given by the analysis is significantly longer than that predicted by the codes equation. However, when the effect of infill is included in the models, the time periods determined from eigenvalue analysis were remarkably close to those predicted by the code formulas. The finding of the study has shown us a practical way to determine the fundamental period of steel frames using rational approaches like modal analysis. After an evaluation of the results, a modified formula has been proposed for estimation of natural period of steel buildings with moment‐resisting frame system having infill. Using the proposed formula, we can estimate natural period of this kind of structural systems more accurately than the one approximated by code formula. Copyright © 2009 John Wiley & Sons, Ltd.