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Factors Affecting the Slenderness Limit for RC Columns-The Use of the (ACI-318M-05) Provisions

Ihsan A. S. Al-Sharrbaf

AL-NAHRAIN JOURNAL FOR ENGINEERING SCIENCES مجلة النهرين للعلوم الهندسية
ISSN: 25219154 / eISSN 25219162 Year: 2008 Volume: 11 Issue: 3 Pages: 342-356
Publisher: Al-Nahrain University جامعة النهرين

Abstract

The current ACI code and many other codes permit the moment magnification method for design of slender reinforced concrete (RC) columns. Manually, the design/analysis procedure is tedious, so that the codes state a pre-prediction if the column is slender or not. In other words, before starting design codes provide slenderness limits to be considered to decide whether a column is slender or not. This work will concentrate on the slender RC column provisions of the latest ACI Code. Using this method some columns are found to be short. In the proposed method of this work, it is found that some of these “short” columns are found to be “long”, thus needing moment magnification. Since column analysis/design represents dealing with one of the most critical parts of RC buildings, this proposed magnification is presented in this work.