Analytical Model for Initial Rotational Stiffness of Steel Beam to Concrete-Filled Steel Tube Column Connections with Bidirectional Bolts
Publication: Journal of Structural Engineering
Volume 144, Issue 11
Abstract
The initial rotational stiffness of connections is important for the design of semirigid frames. However, most current studies on steel beam to concrete-filled steel tube column connections with bidirectional bolts are based on experimental tests, and theoretical analysis and numerical analysis are rarely reported. As a result, there is no suitable analytical model for calculating the initial stiffness of the connection. Based on the component method, this paper proposes an analytical model to predict the initial stiffness of the connection. It is considered that the connection rotation is mainly induced by deformations of the endplate in bending, column flange in bending, bolts in tension, and panel zone in shear. Moreover, the effects of the endplate in bidirectional bending and bolt pretension are taken into consideration. Then, the prediction results based on the proposed analytical model are compared with experimental results to verify its accuracy, and comparison results indicate that the proposed analytical model can predict the initial rotational stiffness of steel beam to concrete-filled steel tube column connection well. In addition, bolt diameter and endplate thickness are the most influential parameters that affect the initial stiffness of the connection. It also provides a way for such connections to be designed as rigid connections. Finally, the proposed analytical model can be applied with good precision in elastic analysis and serviceability calculations in the design of semirigid steel-concrete composite frames. It can be applied to four types of connections: stiffened extended endplate connections, nonstiffened extended endplate connections, flush endplate connections, and T-stub connections. The proposed analytical model saves substantial resources and workload in experiments and simulations.
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Acknowledgments
The authors would like to express their gratitude to National Natural Science Foundation of China (51778106), National Key Research and Development Program of China (2017YFC0703410), National Natural Science Foundation of China (51008081 and 50878066), Natural Science Foundation of Fujian Province (2010J05113), Program for New Century Excellent Talents in Fujian Province University (JA13022), and Fundamental Research Funds for the Central Universities (DUT16YQ101).
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Published In
Journal of Structural Engineering
Volume 144 • Issue 11 • November 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Nov 17, 2017
Accepted: May 2, 2018
Published online: Aug 17, 2018
Published in print: Nov 1, 2018
Discussion open until: Jan 17, 2019
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