Structural Behavior of Reinforced Concrete Hollow Beams under Partial Uniformly Distributed Load
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Abstract
A Longitudinal opening is used to construct hollow core beam is a cast in site or precast or pre stressed concrete member with continuous voids provided to reduce weight, cost and, as a side benefit, to use for concealed electrical or mechanical runs. Primarily is used as floor beams or roof deck systems. This study investigate the behavior of six beams (solid or with opening) of dimension (length 1000 x height 180 x width120mm) simply support under partial uniformly distributed load, four of these beam contain long opening of varied section (40x40mm) or (80x40mm). The effect of vertical steel reinforcing, opening size and orientations are investigated to evaluate the response of beams. The experimental behavior based on load-deflection measured at central and quarter of tension zones. The experimental test result shows the presence of Hollow decrease the load carrying capacity by about (37.14% to 58.33%) and increased the deflections by about (71.6% for (Hollow ratio 7.4%) to 75.5% for (Hollow ratio 14.8%)) for same applied load
compared with solid beams with the same properties. The increase shear steel reinforcing will decrease all the deformations at all stages of loading, but particularly after initial cracking and give enhancement in ultimate load capacity of beams by about 31.5% with increasing the amount of shear steel reinforcing by about 50%. Finally, ductility is increased in all cases under partial uniformly distributed load when hollow ratio decreased by about 50% or increased in shear steel reinforcing by about 50%
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Abbas, N. J., 2000 , Structural Behavior of Ferrocement Box-Beam, Deploma, Research, University of Technology.
ACI 318M – 11, 2011, Building Code Requirements for Reinforced Concrete, ACI Committee 318M.
Alnuaimi, A.S., 2003, Parametric Study on the Computational Behaviour of Hollow Beams Designed Using the Direct Design Method - Numerical Factors, Proceedings of International Conference on Advances in Structures, ASSCCA'03, Sydney, Australia, A.A., 22-25 June, Balkema Publishers, Vol. 2, pp. 1017 - 1021.
Alnuaimi, A.S., 2002, Parametric Study on the Computational Behaviour of Hollow Beams Designed Using the Direct Design Method - Material Factors, Proceedings of High Performance Structures and Composites, Seville, Spain, WIT Press Publishers, March, pp. 605-614.
British Standard Institution (BS 8110), 1997, Code of Practice for Design and Construction, British Standard Institution Part 1, London.
Mander J.B. ,1984, Experimental Behavior of Ductile Hollow Reinforced Columns, In Proceedings, 8th World Conference on Earthquake Engineering, Vol. 6, pp. 529-536.
Nilson, A. H. , Darwin, D. and Dolan, C. W., 2006, Design of Concrete Structure McGraw-Hill Book Company.
Nimnim, H. T., 1993, Structural Behavior of Ferrocement Box-Beams, M.Sc., thesis, University of Technology.
Oehlers, D. J., and Bradford, M. A., 1995, Composite Steel and Concrete Structural Members, Kidlington, Oxford, U.K.: Elsevier Science, Ltd.
Takahashi Y., Iemura H., 2000 Inelastic Seismic Performance of RC Tall Piers with Hollow Section, In Proceedings, 12th World Conference on Earthquake Engineering, ref. 1353.