![]() The deflection is calculated assuming a sine curve for the deflected shape of the column Then a second set of graphs is prepared which plot the deflected shape of the column as it buckles, relating its mid- height deflection to the maximum section curvature. Firstly, graphs of load eccentricity against section curvature are prepared for various values of applied axial load. A simple graphical technique has been proposed by Beal for rigorous analysis of pin- ended slender reinforced concrete columns. Therefore one of the objectives of the present study is to investigate the theoretical behaviour of such columns, in order to establish suitable rules for their design.Ģ. There is now considerable interest in the use of high- strength concrete in columns, which can allow columns that are more slender to be used to sustain high loads. ![]() These methods are approximate and largely empirical in nature. Codes of practice recommend various design methods for slender columns based on capacity reduction factors, additional design moments, or moment magnification, to account for the effects of buckling. Exact analysis methods are generally complicated and unsuitable for everyday design. The analysis of slender reinforced concrete columns is complicated because the buckling analysis must take account of the non- linear properties of the materials and also construction imperfections. Keywords: buildings, structure & design columns concrete structures New design rules which give more consistent and accurate results are proposed. Existing BS 8110 design rules are found to give poor agreement with both the theoretical analysis and experimental results. Charts For The Design Of Circular Columns To Bs 8110 code#The results of this accurate analysis are used as a benchmark for the assessment of code of practice design rules. It is used here to investigate the behaviour of normal- and high- strength concrete columns under both axial and eccentric loads and with a variety of slenderness ratios and reinforcement proportions. The method provides a powerful analytical tool, allowing fast determination of the column capacity for a wide range of slenderness and loading conditions. Research by Khalil to verify and develop Beal’s graphical method of buckling analysis confirms that Beal's method is accurate and effective, giving results which agree well with experimental data. (Associate, Thomason Partnership, Leeds) andĪssistant Professor, Department of Civil Engineering, University of Balamand, Tripoli, Lebanon) ![]() Engrs Structs & Bldgs, 1999, 134, Nov., 345- 357ĭesign of normal- and high- strength concrete columns ![]()
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