Using self-tapping screw to reinforce dowel-type connection in a timber portal frame. (1st January 2019)

• Record Type: Journal Article
• Authors: Zhang, Cong; Guo, Haibo; Jung, Kiho; Harris, Richard; Chang, Wen-Shao
• Is Part Of: Engineering structures. Volume 178(2019)
• Page Start: 656
• Page End: 664
• Publication Date: 2019-01-01
• Subjects: Self-tapping screws -- Reinforcement -- Timber dowel-type connection -- Moment-resisting -- Theoretical prediction; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2018.10.066
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: Full-scale testing on timber portal frame with screw reinforcement. Innovative use of self-tapping screws. Qualitative discussion on the effectiveness of screw reinforcement. Abstract: In this study, partially threaded self-tapping screws have been used as reinforcement on timber portal frames to enhance mechanical performance of dowel-type connections. Experimental tests on unreinforced and reinforced portal frames showed that reinforced frames achieved a 31% and 51% increase in moment-resisting capacity and ultimate rotation, respectively. The test on the reinforced frames was stopped when the stroke on the hydraulic jacks had been reached, while 20% of load drop was not observed. The test results demonstrated the performance of partially threaded self-tapping screws which reduces the drive-in torque when compared to fully threaded self-tapping screws. A theoretical prediction on the characteristic moment-resisting capacity of screw reinforced portal frames is proposed.