Lateral Performance of Traditional Heavy Timber Frames with Mortise-Tenon Joints Retrofitted Using Self-Tapping Screws
Publication: Journal of Structural Engineering
Volume 144, Issue 10
Abstract
This paper presents the test results of three -scaled Chinese traditional mortise-tenon jointed beam-column frames, initially loaded to damage and retrofitted by use of self-tapping screws and retested under a constant vertical load and cyclic lateral loading. The retrofitting effect on a bare frame and two otherwise the same frames with partial (with a window opening) and full infill is discussed in terms of the damage distribution, envelope curve properties, strength degradation, and equivalent viscous damping ratio. The results indicate that the retrofitted frames exhibited smaller stiffness (27% the least), large deformability (155% the most), higher damping ratios (118% the most), and similar strength degradation (less than 40% decrease) from primary cycles to trailing cycles. The maximum loads of the rested bare frames, partially infilled frame, and fully infilled frame reached 55%, 85%, and 125% of those from the initial testing, respectively. It is also believed that the retrofitting of the fork-leg joints of the columns to the bottom beams was unsuccessful using screws and may be unnecessary for the better function of the infill panels. The retrofitting of the mortise-tenon joints next to the main and secondary beams above the infill panels are, however, very important, especially in terms of preventing pulling-out deformation of the joints because it is closely related to the shear stiffness of the infill panels.
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Acknowledgments
This research work is sponsored by the Scientific and Technology Committee of Shanghai Metropolitan on the project “Design and Construction of a Multi-Story Traditional Pavilion Style Timber Pagoda” (Grant No. 13231201703) and the National Natural Science Foundation of China (Grant No. 51478336).
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Published In
Journal of Structural Engineering
Volume 144 • Issue 10 • October 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Dec 3, 2017
Accepted: May 3, 2018
Published online: Jul 28, 2018
Published in print: Oct 1, 2018
Discussion open until: Dec 28, 2018
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