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Title Free vibrations of multi-storey, multi-bay reinforced concrete frames with strong column – weak be
Journal International journal of Engineering And Applied Science
Publisher Faculty of Engineering, Nnamdi Azikiwe University, Awka Nigeria.
Issue 1
ISSN 1119-8109
Pages .
Subject Civil Engineering
Date of Publication 2010

AUTHOR(S) P.D. Onodagu, C.A. Chidolue, and I.O. Onyeyili

ABSTRACT

This paper investigated the dynamic responses of multistorey, multibay reinforced concrete framed buildings, using the concept of strong column – weak beam model. In the course of this work, three simulated frames were dynamically investigated; the natural frequencies of each frame at various ratios of column flexural strengths to beam flexural strengths were numerically evaluated at a given concrete grade and unit weight; using classical method of displacement; and subsequently, the fundamental tone of vibration at a given ratio was explicitly compared with the fundamental tone of vibration of the same system, evaluated using the Shear Building model approach. And from the results obtained, it was found that the column flexural strength demand for dynamic stability varied in accordance with the number of floor levels of the frames. This paper, therefore, establishes no fixed empirical value for the ratio of column flexural strength to beam flexural strength; and consequently recommends that the column flexural strength participation factor(s) in the analysis of dynamic stability of frames with strong column – weak beam concept be adequately evaluated, using Classical method of analysis. Keywords: Capacity design concept; Strong column – weak beam model; multistorey – multibay frames; Finite degree of


Keywords: Classical displacement method; Fundamental frequency.




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