Loading...
Experimental study on long spanning composite cellular beam under flexure and shear
Sheehan, Therese Dai, Xianghe Lam, Dennis Aggelopoulos, E.S. Lawson, M. Obiala, R.
Sheehan, Therese
Dai, Xianghe
Lam, Dennis
Aggelopoulos, E.S.
Lawson, M.
Obiala, R.
Publication Date
2015-01
End of Embargo
Supervisor
Rights
© 2016 Elsevier. Reproduced in accordance with the publisher's self-archiving policy. This manuscript version is made available under the CC-BY-NC-ND 4.0 license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Peer-Reviewed
Yes
Open Access status
openAccess
Accepted for publication
2015-08-28
Institution
Department
Awarded
Embargo end date
Additional title
Abstract
This paper describes a sequence of experiments on a long-span asymmetric composite cellular beam. This type of beam has become very popular, combining the composite action between the steel and concrete with the increased section depth, compared with more commonly used solid-web I sections. Openings in the steel web also reduce the self-weight and can accommodate the passage of service ducts. Eurocode 4 recommends a high degree of shear connection for asymmetric composite beams despite the practical difficulties in achieving this. Recent research suggests that the required degree of shear connection could be reduced, particularly for beams that are unpropped during construction. However, little test data exists to verify the behaviour of unpropped composite cellular beams. Therefore two series of tests were conducted on a 15.26 m long asymmetric composite cellular beam with regular circular openings and an elongated opening at the mid-span. The degree of shear connection was 36%, less than half of that recommended in Eurocode 4, and the beam was unpropped during construction. The beam was subjected to uniformly distributed loading and shear load during the tests. The end-slip, mid-span vertical deflection, shear connector capacity and strain distribution were examined. The beam failed at an applied uniform load of 17.2 kN/m2 (3.4 × design working load 5.0 kN/m2). The member withstood an applied shear load that was 45% higher than predicted, and exhibited a Vierendeel mechanism at the elongated opening. Overall, these tests demonstrated the potential of unpropped composite cellular beams with low degrees of shear connection.
Version
Accepted manuscript
Citation
Sheehan T, Dai X, Lam D et al (2016) Experimental study on long spanning composite cellular beam under flexure and shear. Journal of Constructional Steel Research. 116: 40-54.
Link to publisher’s version
Link to published version
Link to Version of Record
Type
Article