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Serviceability performance of steel-concrete composite beams
Lawson, R.M. Lam, Dennis Aggelopoulos, E.S. Nellinger, S.
Lawson, R.M.
Lam, Dennis
Aggelopoulos, E.S.
Nellinger, S.
Publication Date
2017-02
End of Embargo
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© 2016 ICE Publishing. Reproduced in accordance with the publisher's self-archiving policy.
Peer-Reviewed
Yes
Open Access status
Accepted for publication
2016-09-07
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Abstract
For composite beams with low degrees of shear connection, additional deflections occur due to slip in the shear connectors, which can be significant for beams with low degrees of shear connection. A design formula is presented for the effective stiffness of composite beams taking account of the stiffness of the shear connectors, which is compared to measured deflections of 6 symmetric beams and an 11m span composite beam of asymmetric profile. It is shown that the comparison is good when using a shear connector stiffness of 70 kN/mm for single shear connectors and 100 kN/mm for pairs of shear connectors per deck rib. Results of push tests on a range of deck profiles confirm these initial elastic stiffnesses. To ensure that the slip at the serviceability limit state does not lead to permanent deformations of the beam, it is proposed that the minimum degree of shear connection should not fall below 30% for un-propped beams and 40% for propped beams of symmetric cross-section.
Version
final draft paper
Citation
Lawson RM, Lam D, Aggelopoulos ES et al (2017) Serviceability performance of steel-concrete composite beams. Proceedings of the Institution of Civil Engineers - Structures and Buildings. 170(SB2): 98-114.
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Article