Techno Press
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Steel and Composite Structures   Volume 22, Number 2, October10 2016, pages 323-352
Strength and stiffness modeling of extended endplate connections with circular and rectangular bolt configurations
Elie G. Hantouche and Elie N. Mouannes

Abstract     [Full Text]
    The results of a series of finite element (FE) simulations and experimental studies are used to develop strength and stiffness models that predict the failure capacity and response characteristics of unstiffened extended endplate connections with circular and rectangular bolt configurations associated with deep girders. The proposed stiffness models are composed of multi-linear springs which model the overall extended endplate/column flange system deformation and strength of key-components. Comparison of model predictions with FE and experimental results available in the literature show that the proposed models accurately predict the strength and the response of extended endplate/column system with circular and rectangular bolt configurations. The effect of the bolt configuration (circular and rectangular) on the prying phenomenon encountered in the unstiffened extended endplate/column system was investigated. Based on FE results, extended endplate with circular bolt configuration has a more ductile behavior and exhibits higher total prying forces. The proposed models can be used to design connections that cover all possible failure modes for extended endplate with circular bolt configuration. This study provides guidelines for engineers to account for the additional forces induced in the tension bolts and for the maximum rotational capacity demand in the connection which are required for seismic analysis and design.
Key Words
    extended endplate; failure modes; circular bolts; finite element; strength and stiffness models; ductility
Department of Civil and Environmental Engineering, Faculty of Engineering and Architecture, American University of Beirut (AUB), Beirut, Lebanon.

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