Techno Press

Steel and Composite Structures   Volume 20, Number 3, February29 2016, pages 651-669
Numerical analysis of channel connectors under fire and a comparison of performance with different types of shear connectors subjected to fire
S.E.M. Shahabi, N.H. Ramli Sulong, M. Shariati, M. Mohammadhassani and S.N.R. Shah

Abstract     [Full Text]
    The behavior of shear connectors plays a significant role in maintaining the required strength of a composite beam in normal and hazardous conditions. Various types of shear connectors are available and being utilized in the construction industry according to their use. Channel connectors are a suitable replacement for conventional shear connectors. These connectors have been tested under different types of loading at ambient temperature; however, the behavior of these connectors at elevated temperatures has not been studied. This investigation proposes a numerical analysis approach to estimate the behavior of channel connectors under fire andcompare it with the numerical analysis performed in headed stud and Perfobond shear connectors subjected to fire. This paper first reviews the mechanism of various types of shear connectors and then proposes a non-linear thermomechanical finite element (FE) model of channel shear connectors embedded in high-strength concrete (HSC) subjected to fire. Initially, an accurate nonlinear FE model of the specimens tested at ambient temperature was developed to investigate the strength of the channel-type connectors embedded in an HSC slab. The outcomes were verified with the experimental study performed on the testing of channel connectors at ambient temperature by Shariati et al. (2012). The FE model at ambient temperature was extended to identify the behavior of channel connectors subjected to fire. A comparative study is performed to evaluate the performance of channel connectors against headed stud and Perfobond shear connectors. The channel connectors were found to be a more economical and easy-to-apply alternative to conventional shear connectors.
Key Words
    composite structures; finite element modeling; channel connectors; elevated temperatures; load-slip relationship
(1) S.E.M. Shahabi, N.H. Ramli Sulong, M. Shariati, S.N.R. Shah:
Department of Civil Engineering, University of Malaya, 50603, Kuala Lumpur, Malaysia;
(2) M. Mohammadhassani:
Member of scientific board of Building & Housing Research Center, Tehran, Iran.

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