Direct Design of T-Beams

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Title: Direct Design of T-Beams

Author(s): Henry J. Cowan

Publication: Journal Proceedings

Volume: 47

Issue: 3

Appears on pages(s): 533-544

Keywords: no keywords

Date: 3/1/1951

Abstract:
In designing T-beams by usual methods some initial dimensions of the section must be assumed, either the complete dimensions - and the maximum concrete and steel stresses computed to ensure they are less than the allowable atress - or the effective depth only assumed - with tension area computed and the maximum compressive stress in the flange checked to find if compressive reinforcement is required. The author emphasizes that both methods are likely to produce uneconomical sections and take more time. The direct design procedure proposed enables the dimensions of a T-beam to be calculated for any given set of conditions. Curves are set up for finding the value of j, and the solution of problems by normal methods and "direct design" are compared by solving six examples. An "equivalent falnge" method is proposed for the balanced design of T-beams when the area of compression reinforcement isspecified, and results show little difference between exact and approximate methods of design.