Keywords: pre-cast composite beam, strain compatibility, flexural moment.

A composite structure should be optimized to utilise the strengths of both steel and concrete. Unlike other structures composed of a single material, the composite structure is greatly improved by rigidity, which enables it to provide structural stability. The composite beam used in the study is a steel framed reinforced concrete structure (SRC) type, which is a widely used composite structure. Reverse T type steels are embedded in the precast concrete and the concrete is cast in place to form slabs, which connect the joints of the beams and the columns.

A strain-compatibility approach that allows the accurate prediction of beam behaviour is adopted in order to analyse the flexural capacity of the precast composite beams. The AISC (American Institute of Steel Construction) proposes the strain-compatibility approach as an analytical method for composite beams. This paper is based on the strain-compatibility approach proposed by the AISC. The strain-compatibility approach assumes that the stress state of the components generated at each limit state determines the location of a neutral axis in the cross-section [1,2].

This paper assesses the flexural capacity of each end of the composite beams that are embedded in the reverse T type steels. To do so, the flexural capacity of each end is calculated based on a design created using the strain-compatibility approach. It is compared with the experimental data for the same ends [1,2,3,4,5].

Both experimental and calculated values of the flexural capacity based on a strain-compatibility approach at the maximum load limit state are well correlated, demonstrating that the analytical method provides a practical approach for predicting the behaviour of these composite beams.

1

W.K. Hong, S.C. Park, J.M. Kim, S.G. Lee, S.I. Kim, K.J. Yoon, H.C. Lee, "Composite beam composed of steel and pre-cast concrete (modularized hybrid system, MHS) Part I: Experimental investigation", Struct. Des. Tall. Spec. Build., 19(3), 275-289, 2010.

2

W.K. Hong, J.M. Kim, S.C. Park, S.G. Lee, S.I. Kim, K.J. Yoon, H.C. Kim, J.T. Kim, "A new apartment construction technology with effective CO2 emission reduction capabilities", Energy - Int. J., 35(6), 2639-2646, 2010. doi:10.1016/j.energy.2009.05.036

3

W.K. Hong, S.I. Kim, S.C. Park, J.M. Kim, S.G. Lee, K.J. Yoon, S.K. Kim, "Composite beam composed of steel and pre-cast concrete (modularized hybrid system, MHS) Part IV: Application for multi-residential housing", Struct. Des. Tall. Spec. Build., 19(7), 707-727, 2010.

4

W.K. Hong, J.M. Kim, S.C. Park, S.I. Kim, S.G. Lee, H.C. Lee, K.J. Yoon, "Composite beam composed of steel and pre-cast concrete (modularized hybrid system, MHS) Part II: Analytical investigation", Struct. Des. Tall. Spec. Build., 18(8), 891-905, 2009. doi:10.1002/tal.484

5

S.Y. Jeong, W.K. Hong, S.C. Park, G.T. Lim, E. Kim, "Investigation of the Neutral Axis in the Positive Moment Region of Composite Beams", ICECE2011, 60(87), 465-470, 2011.

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