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Truss Plate reinforced bolted connections in parallel strand lumber

University of British Columbia

Research has shown that strength and ductility of bolted connections in sawn timber can be improved by reinforcing the connection area with such materials as fibreglass, plywood, densified veneer wood or truss plates. This thesis investigates the behaviour of truss plate reinforced bolted connections in parallel strand lumber (PSL). Static tension tests were performed on single bolt connections and multiple bolt connections in 38x140 mm specimens, 89x140 mm specimens, and 133x191 mm specimens. All connections were designed according to CAN/CSA 086.1-94. Each test configuration had a set of 10 unreinforced connection specimens and a set of 10 reinforced connection specimens. Connections in the 38x140 mm test specimens consisted of one 12.7 mm diameter bolt and ten 12.7 mm bolts (two rows of 5 bolts). With the single bolt connections, average ultimate strength improvements of 36% and ductility improvements in excess of 278% were realized by reinforcing the connections. Reinforcement of the ten bolt connections did not effect the average ultimate strength, while ductility improved by 250%. Connections in the 89x140 mm test specimens consisted of one 15.9 mm diameter bolt and ten 15.9 mm bolts (two rows of 5 bolts). With the single bolt connections, average ultimate strength improvements of 12% and ductility improvements of 104% were realized by reinforcing the connections. For the ten bolt connections, reinforcement did not significantly change the average ultimate strength, while ductility improved about 5%. Connections in the 133x191 mm test specimens consisted of one 22.2 mm diameter bolt and four 22.2 mm bolts (two rows of 2 bolts). With the single bolt connections, average ultimate strength improvements of 3% and ductility improvements greater than 143% were realized by reinforcing the connections. For the four bolt connections, the average ultimate strength was increased by 6%, while ductility improved by about 35%.

Thesis/Dissertation

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2009-06-15

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http://hdl.handle.net/2429/9160

Forestry

University of British Columbia

UBCV

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