Scope of Bamboo Reinforcement in Concrete Beams For Low- Cost Housing.
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Date
2006-12
Authors
Falade, F.
Ikponmwosa, E.
Journal Title
Journal ISSN
Volume Title
Publisher
Nigerian Building And Road Research Institute (NBRRI).
Abstract
This paper investigates the extent to which bamboo reinforcement can be used in concrete beams for low-cost housing. Beams of uniform cross sectional area (225x450mm) were designed to BS 8110. They were simply supported over varying effective spans of 3.0, 3.5, 4.0 and 4.5 metres. The results of the laboratory tests showed that the average 28-day characteristic strength of concrete was 25N/mm2 while an average tensile strength of 133.50N/mm2 was obtained for bamboo splints of size 10x10mm (square section). The design was based on two limit states: ultimate and serviceability (deflection). The beams were subjected to 20%, 40%, 60%, 80% and 100% of the ultimate moment of resistance of the section (Mu = 0.156bd2fcu). The corresponding uniformly distributed load was computed from the well–known relationship between maximum moment and uniformly distributed load (udl) on beam and its effective span. The udl was imposed on each beam at different percentages of ultimate moment of resistance.
All the beams were singly reinforced. The lever arm curve that permits the area of reinforcement to be calculated for singly reinforced beams was used. The corresponding deflection at each level of loading was calculated for each span. The well-established equations of deflection were used with some modifications that reflect the characteristics of the bamboo splints.
The shear stress at each level of loading was calculated and compared with both allowable and ultimate values. The computed deflection for each loading case showed that the deflection of bamboo-reinforced beams increased with increase in value of applied moment and span but reduced with increase in the quantity of bamboo reinforcement in the beams.
The results show that the optimum span for bamboo reinforcement in reinforced concrete beams based on cross-sectional dimensions of 225x450mm is 4000mm at optimum load of 60% Mu. Within this limit, the requirements of ultimate and serviceability limit states were achieved.
Description
Staff Publication
Keywords
Bamboo , Low - Cost Housing
Citation
Falade, F. and Ikponmwosa, E. (2006) Scope of Bamboo Reinforcement in Concrete Beams For Low- Cost Housing. Journal of Construction And Materials Technology, Vol. 3, (1-2),p. 39 - 45.