Numerical Simulations of Fully Encased Composite Columns under Gravity Loads

Abstract:

Composite structures is a combination of structural steel shapes and reinforced concrete and these two materials are combined in such a way to benefit each material characteristic. This paper investigates the behaviour and strength of axially loaded concrete encased steel composite columns. A nonlinear 3-D finite element (FE) model has been developed to analyse the inelastic behaviour of steel, concrete, and longitudinal reinforcement as well as the effect of concrete confinement on fully encased composite (FEC) columns. The model has been verified against the experiments conducted in the laboratory under concentric gravity loads. It has been found that the FE model is capable of predicting the nonlinear behaviour of the FEC columns up to failure with good accuracy. The capacities of each constituent of FEC columnssuch as steel-I section, concrete and rebars were also determined from the numerical study. Concrete is observed to provide around 57% of the total axial capacity of the column whereas the steel I-sections contributes to the rest of the capacity as well as to the ductility of the overall system. The nonlinear FE model developed in this study is also used to explore the effects of concrete strength on the behaviour of FEC columns under concentric loads. The axial capacity of FEC columns has been found to increase significantly by increasing the strength of concrete.

• Periodical: Applied Mechanics and Materials (Volume 860)
• Pages: 140-145
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.860.140
• Online since: December 2016
• Authors: Soebur Rahman, Mahbuba Begum
• Keywords: Columns, Composite, Finite Element, Fully Encased, Numerical, Strength

References

[1] E.I. Sherif, G. Deierlein, Strength and Ductility of Concrete Encased Composite Columns, Journal of structural Engineering, vol125(9), pp.1009-1019, (1999).

DOI: 10.1061/(asce)0733-9445(1999)125:9(1009)

[2] S.A. Mirza, B.W. Skrabek, Statistical analysis of slender composite beam–column Strength, Journal of Structural Engineering, ASCE; vol118(5): 1312–31, (1992).

DOI: 10.1061/(asce)0733-9445(1992)118:5(1312)

[3] K.S. Virdi, P.J. Dowling, The ultimate strength of composite columns in biaxial bending, Proceedings of the institution of civil engineers, Part 2, 251-272, (1973).

DOI: 10.1680/iicep.1973.4958

[4] P.R. Munoz C.T.T. Hsu, Behavior of Biaxial Loaded Concrete- Encased Composite Columns". Journal of structural Engineering, vol 123, No. 9pp 1163-1171, (1997).

DOI: 10.1061/(asce)0733-9445(1997)123:9(1163)

[5] N.E. Shanmugam, B. Lakshmi, State of art report on steel composite columns, Journal of constructional steel research, vol l57, pp.1041-80, ( 2001).

DOI: 10.1016/s0143-974x(01)00021-9

[6] M. M. EL-Attar, H. Z. El-Karmoty, A. A. EL-Moneim, The behavior of ultra-high-strength reinforced concrete columns under axial and cyclic lateral loads, Journal Housing and Building National Research Center, Cairo, Egypt, (2015).

DOI: 10.1016/j.hbrcj.2014.10.003

[7] C. Campian, Z. Nagy, M. Pop, Behavior of fully encased steel-concrete composite columns subjected to monotonic and cyclic loading, International Scientific Conference Urban Civil Engineering and Municipal Facilities, SPbUCEMF-2015Procedia Engineering 117 p.439.

DOI: 10.1016/j.proeng.2015.08.193

[8] S. Tokgoz, C. Dundar, Experimental tests on biaxial loaded concrete encased composite columns, Journal on Steel and Composite Structure, vol8(5), pp.423-438, (2008).

DOI: 10.12989/scs.2008.8.5.423

[9] C.C. Chen, N.J. Lin, Analytical model for predicting axial capacity and behavior of concrete encased steel composite stub columns, Journal of Constructional Steel Research, vol62 , p.424–433, (2006).

DOI: 10.1016/j.jcsr.2005.04.021

[10] C.S. Kim, H.G. Park, K.S. Chung, I.R. Choi, Eccentric Axial Load Testing for Concrete-Encased Steel Columns Using 800 MPa Steel and 100 MPa Concrete, Journal of Structural Engineering, ASCE; vol. 138(8): pp.1019-1031, (2012).

DOI: 10.1061/(asce)st.1943-541x.0000533

[11] E. Ellobodya, B. Young, Numerical simulation of concrete encased steel composite columns, Journal of Constructional Steel Research, vol67, p.211–222, (2011).

DOI: 10.1016/j.jcsr.2010.08.003

[12] BNBC, Bangladesh National Building Code, Housing and Building Research Institute, Dhaka, Bangladesh, (1993).

[13] Hibbitt, Karlsson and Sorensen, Inc (HKS). ABAQUS/Explicit User's Manual, Version 6. 10, (2010).

[14] D.J. Carreira, K.H. Chu, Stress-Strain relationship for plain concrete in compression, ACI Journal, Technical Paper, 82-72, (1984).

[15] D.J. Carreira, K.H. Chu, Stress-Strain relationship for Reinforced concrete in Tension, ACI Journal, Technical Paper, 83-3, (1984).

[16] K.Z. Soliman A.I. Arafa T.M. EIrakib, Review of Design Codes of Concrete encased steel short columns under axial compression, Journal House and Building National Research center, Cairo, EgyptVol9, 134-143 (2013).

DOI: 10.1016/j.hbrcj.2013.02.002