The Characteristics of Curvature Ductility Factor of Reinforced Concrete Hollow Section Beams
철근콘크리트 속빈 단면 보의 곡률연성지수 특성
Lee, Hyung-Joon (Dept. of Civil and Environmental Engineering, Hanbat National University)
이형준 (한밭대학교 건설환경공학과)
In highly elevated piers and long span beams, a hollow section is often used to reduce the self-weight and increase the flexural rigidity of members. Numerical analysis was conducted to obtain the moment-curvature curves and curvature ductility factor for the RC hollow section beams under a range of hollow portion sizes and reinforcement conditions in the upper flange and web. The curvature ductility factor was constantly maintained until the hollow portion size($b_i/b_o/h_i/h_o$) was less than or equal to 0.5. The curvature ductility factor decreased sharply if ($b_i/b_o/h_i/h_o$) was 0.7 or more. The curvature ductility factor of the beam decreased if reinforcement was provided in the web of the RC hollow section beam. To obtain the same level of the ductility factor as the singly reinforced section, the reinforcement should be provided in the upper flange as much as the web reinforcement.
Ductility factor;Numerical analysis;RC hollow section beam;Reinforcement condition
Inoue, S. and Egawa, N. "Flexural and Shear Behavior of Reinforced Concrete Hollow Beams under Reversed Cyclic Loads", Proc. of 7th World Conference on Earthquake Engineering. Paper No.1359, March, 1988.
Korea Concrete Institute, Concrete Design Code and Commentary, Kimoondang Publishing Company, Seoul, Korea, 599pp, 2012.
ACI Committee 318, Building Code Requirements for Structural Concrete (ACI318-08). American Concrete Institute, Farmington Hills, Detroit, 473pp, 2008.
Alnuaimi, A.S., Al-Jabri, K.S. and Hago, A., "Comparison between Solid and Hollow Reinforced Concrete Beams", Materials and Structures, Vol.41, pp.269-286. 2008. Doi 10.1617/s11527-007-9237-x. DOI: http://dx.doi.org/10.1617/s11527-007-9237-x https://doi.org/10.1617/s11527-007-9237-x
Bernardo, L.F.A. and Lopes, S.M.R., "Plastic Analysis and Twist Capacity of High-Strength Concrete Hollow Beams under Pure Torsion", Engineering Structures, Vol.49, pp.190-201, 2013. DOI: http://dx.doi.org/10.1016/j.engstruct.2012.10.030 https://doi.org/10.1016/j.engstruct.2012.10.030
Lee, H.J.,"Evaluation on Moment-Curvature Relations and Curvature Ductility Factor of Reinforced Concrete Beams with High Strength Materials," Journal of The Korean Concrete Institute, Vol.25, No.3, pp.283-294, 2013. DOI: http://dx.doi.org/10.4334/JKCI.2013.25.3.283 https://doi.org/10.4334/JKCI.2013.25.3.283
Lee, H.J.,"Predictions of Curvature Ductility Factor of Reinforced Concrete Beam Sections Used High Strength Concrete and Steel", Journal of The Korean Society of Civil Engineers, Vol.33, No.2, pp.438-493, 2013. DOI: http://dx.doi.org/10.12652/Ksce.2013.33.2.483 https://doi.org/10.12652/Ksce.2013.33.2.483
Lee, J.H., "Analytical Study on Ductility Index of Reinforced Concrete Flexural Members", KSCE, Journal of The Korean Society of Civil Engineers, Vol.14, No.3, pp.391-402, 1994
Park, R. and Paulay, T., Reinforced Concrete Structures. Wiely, New York, 1975. DOI: http://dx.doi.org/10.1002/9780470172834 https://doi.org/10.1002/9780470172834
Attard, M.M. and Setunge, S., "The Stress- Strain Relationship of Confined and Unconfined Concrete", ACI Materials Journal, Vol.93, No.5, pp.432-444, 1996.
Pam, H.J., Kwan, A.K.H. and Islam, M.S., "Flexural Strength and Ductility of Reinforced Normal-and High-Strength Concrete Beams", Proceedings of the ICE-Structures and Buildings, Vol.146, No.4, pp.381-389, 2001 DOI: http://dx.doi.org/10.1680/stbu.2001.146.4.381 https://doi.org/10.1680/stbu.2001.146.4.381
Ho, J.C.M., Kwan, A.K.H. and Pam, H.J., "Theoretical Analysis of Post-Peak Behavior of Normal and High Strength Concrete Beams", The Structural Design of Tall Special Buildings, pp.109-125 2003. DOI: http://dx.doi.org/10.1002/tal.216 https://doi.org/10.1002/tal.216
Bai, Z.Z. and Au, F.T.K., "Flexural Ductility Design of High-Strength Concrete Beams", The Structural Design of Tall Special Buildings, pp.521-542, 2011. DOI: http://dx.doi.org/10.1002/tal.714 https://doi.org/10.1002/tal.714
Arslan, G. and Cihanli, E., "Curvature Ductility Prediction of Reinforced High-Strength Concrete Beam Sections", Journal of Civil Engineering and Management, Vol.16, No.4, pp.462-470, 2010. DOI: http://dx.doi.org/10.3846/jcem.2010.52 https://doi.org/10.3846/jcem.2010.52
Jang, I.Y., Park, H.G., Kim, S.S., Kim, J.H. and Kim. Y.G., "On the Ductility of High-Strength Concrete Beams", International Journal of Concrete Structures and Materials, Vol.2, No. 2, pp.115-122, 2008. DOI: http://dx.doi.org/10.4334/IJCSM.2008.2.2.115 https://doi.org/10.4334/IJCSM.2008.2.2.115
Rashid, M.A. and Mansur, M.A., "Reinforced High-Strength Concrete Beams in Flexure", ACI Structural Journal, Vol.102, No.3, pp.462-471, 2005.