Beam-to-CFT High-Strength Joints with External Diaphragm. I: Design and Experimental Validation
Publication: Journal of Structural Engineering
Volume 143, Issue 5
Abstract
The paper presents the outcomes of an experimental program developed and carried out with the aim of characterizing the behavior of two types of moment-resisting joints in multistory frames of concrete-filled high-strength steel rectangular hollow section (RHS) columns and mild carbon steel beams. The paper describes the design approach and displays the specific detailing for the two joint typologies: with reduced beam section (RBS) and with cover plates (CP). In spite of the various past and recent studies which were focused on the evaluation of full-strength welded beam-to-concrete-filled-tube (CFT) column joints, particular design procedures are missing at the European level. The objectives of the current research were to (1) development a design procedure for welded beam-to-CF-RHS joints, (2) experimental validation of the of the design procedure, and (3) assessment of the seismic performance. The monotonic and cyclic tests evidenced a good conception and design of the RBS and CP joints. In particular, the current study proved the feasibility of using higher steel grades in columns and joint components, and the use of an external diaphragm for the transfer the loads from the beam to the side walls of the RHS steel tube. The seismic performance of the joints was proved adequate, the joints sustaining rotation capacities larger than the 40 mrad at the significant damage performance level.
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Acknowledgments
The research leading to these results has received funding from the European Community’s Research Fund for Coal and Steel (RFCS) under grant agreement no. RFSR-CT-2009-00024 “High Strength Steel in Seismic Resistant Building Frames (HSS-SERF).” [Additional information is available within the Final Report of the project; see Dubina et al. (2015).]
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Information & Authors
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Published In
Journal of Structural Engineering
Volume 143 • Issue 5 • May 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Oct 12, 2015
Accepted: Sep 28, 2016
Published ahead of print: Jan 16, 2017
Published online: Jan 17, 2017
Published in print: May 1, 2017
Discussion open until: Jun 17, 2017
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