Material-Based Ultimate Moment of Resistance of a Rectangular Concrete Section

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Material-Based Ultimate Moment of Resistance of a Rectangular Concrete Section

Original Article, B23
Joseph Afolayan O, Stephen Alabi A, Lekan Olanitori M.
J. Civil Eng. Urban. 2(4): 131-135. 2012.

ABSTRACT:The incessant collapse of buildings in Nigeria in recent years has been a major concern. This paper addresses one of the major possible causes of building collapse. The minimum compressive strength of concrete using pit-sand as a fine aggregate in Akure, Nigeria was statistically estimated. On the basis of the estimated nominal concrete strength, an implied ultimate moment of resistance of singly reinforced concrete rectangular sections is proposed. The proposal shows that the recommended resistance of concrete given by BS8110 (1997) may be reduced by as much as 50% in order to accommodate the minimum concrete strength for a 1:2:4 mix. A numerical design example based on the proposal showed the necessity of additional compressive reinforcement to justify the use of the current BS 8110 (1997) requirement if Akure pit-sand must be used as fine aggregate.
Keywords:Pit-sand, Concrete, Compressive Strength, implied Ultimate Moment of Resistance.

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