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A platform for research: civil engineering, architecture and urbanism
Experimental Fire Testing of Damaged Glulam Beam Connections Retrofitted with Self-tapping Screws
The main objective of the research study presented in this paper is to investigate the effects of using self-tapping screws (STS) to retrofit damaged glulam beam connections subjected to standard fire. In this experimental study, two full-size glulam beam-end bolted connections with wood-steel-wood connection configuration utilizing two different bolt patterns have been retrofitted using STS after being deliberately damaged through physical testing until failure. In the connection configuration with the first bolt pattern (4BP1), two rows of bolts, each of two bolts, were symmetrically positioned near the top and bottom sides of the beam section. Whereas in the configuration with the second bolt pattern (4BP2), the bottom row of bolts was shifted upward to be located at the mid-height of the beam section to further contribute to the moment-resisting capacity of the connection. Subsequently, the retrofitted connections were experimentally tested at elevated temperatures that followed the CAN/ULC-S101 standard fire time–temperature curve while being loaded to the maximum design load of the weakest undamaged, unreinforced connection configuration. The experimental results of the retrofitted glulam beam connections were compared to those of identical but undamaged, unreinforced connections that were experimentally tested in a prior related study to highlight the influence of STS in strengthening the damaged connections when subjected to fire. Results show that the retrofitted glulam beam connections maintained a minimum of approximately 67% of the fire resistance time of identical but undamaged, unreinforced connections.
Experimental Fire Testing of Damaged Glulam Beam Connections Retrofitted with Self-tapping Screws
The main objective of the research study presented in this paper is to investigate the effects of using self-tapping screws (STS) to retrofit damaged glulam beam connections subjected to standard fire. In this experimental study, two full-size glulam beam-end bolted connections with wood-steel-wood connection configuration utilizing two different bolt patterns have been retrofitted using STS after being deliberately damaged through physical testing until failure. In the connection configuration with the first bolt pattern (4BP1), two rows of bolts, each of two bolts, were symmetrically positioned near the top and bottom sides of the beam section. Whereas in the configuration with the second bolt pattern (4BP2), the bottom row of bolts was shifted upward to be located at the mid-height of the beam section to further contribute to the moment-resisting capacity of the connection. Subsequently, the retrofitted connections were experimentally tested at elevated temperatures that followed the CAN/ULC-S101 standard fire time–temperature curve while being loaded to the maximum design load of the weakest undamaged, unreinforced connection configuration. The experimental results of the retrofitted glulam beam connections were compared to those of identical but undamaged, unreinforced connections that were experimentally tested in a prior related study to highlight the influence of STS in strengthening the damaged connections when subjected to fire. Results show that the retrofitted glulam beam connections maintained a minimum of approximately 67% of the fire resistance time of identical but undamaged, unreinforced connections.
Experimental Fire Testing of Damaged Glulam Beam Connections Retrofitted with Self-tapping Screws
Lecture Notes in Civil Engineering
Gupta, Rishi (editor) / Sun, Min (editor) / Brzev, Svetlana (editor) / Alam, M. Shahria (editor) / Ng, Kelvin Tsun Wai (editor) / Li, Jianbing (editor) / El Damatty, Ashraf (editor) / Lim, Clark (editor) / Hegazi, Mohamed (author) / Salem, Sam (author)
Canadian Society of Civil Engineering Annual Conference ; 2022 ; Whistler, BC, BC, Canada
Proceedings of the Canadian Society of Civil Engineering Annual Conference 2022 ; Chapter: 16 ; 199-213
2024-01-13
15 pages
Article/Chapter (Book)
Electronic Resource
English
Effect of self-tapping screws on moisture induced stresses in glulam
| Elsevier | 2012