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Experimental study on long spanning composite cellular beam under flexure and shear

Sheehan, T, Dai, X, Lam, D, Aggelopoulos, E, Lawson, RM and Obiala, R (2016) Experimental study on long spanning composite cellular beam under flexure and shear Journal of Constructional Steel Research, 116. pp. 40-54.

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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 testswere conducted on a 15.26mlong asymmetric composite cellular beamwith regular circular openings and an elongated opening at themid-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.

Item Type: Article
Subjects : Civil Engineering
Divisions : Faculty of Engineering and Physical Sciences > Civil and Environmental Engineering
Authors :
Sheehan, T
Dai, X
Lam, D
Aggelopoulos, E
Lawson, RM
Obiala, R
Date : January 2016
DOI : 10.1016/j.jcsr.2015.08.047
Copyright Disclaimer : © 2015 Elsevier Ltd. All rights reserved.
Uncontrolled Keywords : Composite beams, Shear connection, Cellular beams, Experiments, Unpropped construction, Eurocode 4
Depositing User : Symplectic Elements
Date Deposited : 10 Oct 2016 13:05
Last Modified : 31 Oct 2017 18:46

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