Seismic Behavior of Welded Beam-to-Column Joints of High-Strength Steel-Moment Frame with Replaceable Damage-Control Fuses
Publication: Journal of Structural Engineering
Volume 146, Issue 8
Abstract
This paper first proposes a high-strength (HS) steel-moment frame structure with replaceable damage-control fuses, which utilized the very large elastic deformation capacity of HS steel and damage-control functions of fuses. The damage is basically concentrated to fuses even under very rare earthquakes, and the damaged fuses can be easily replaced after earthquakes. A test program including 11 full-scale specimens was carried out to study the seismic behavior of HS steel beam-to-column joints either with or without fuses. The investigated parameters include different types of fuses, different thickness of the fuse plate, and different ways to strengthen the out-of-plane stiffness of fuse plates. The failure mode, deformation progress, hysteretic responses, skeleton curves, bending strengths, and energy-dissipation capacity of these full-scale tests were reported, analyzed, and discussed. Test results showed that the HS steel joints with fuses were able to provide large damage-free deformation. The application of proposed fuses in the HS steel-moment frame effectively shifted the damage from beam-to-column welds to replaceable fuse plates. Meanwhile, the shape of fuse plate exhibited marginal influence, but its thickness has significant influence on the T-joint. Formulas were proposed to estimate the yielding and ultimate bending strength of T-joint with fuses. Finally, a step-by-step procedure is given to design the proposed fuses.
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Acknowledgments
The research is in part supported by Scientific Research Fund of Institute of Engineering Mechanics, China Earthquake Administration (Grant No. 2017D01) and National Natural Science Foundation of China (Grant Nos. U1939210 and 51508381).
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Published In
Journal of Structural Engineering
Volume 146 • Issue 8 • August 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: May 7, 2019
Accepted: Feb 4, 2020
Published online: May 20, 2020
Published in print: Aug 1, 2020
Discussion open until: Oct 20, 2020
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