An investigation of truss hold down details.

Material type: Text

TextSeries: Technical report / Cyclone Testing Station ; no. 44Publication details: Townsville, Qld. : Cyclone Testing Station, James Cook University of North Queensland, 1996.Description: 33 p. : ill. ; 30 cmISBN:

0864436076 (pbk)

DDC classification:

624.176 20

Subject: Wide span trusses and especially girder trusses can concentrate wind uplift pressures to high reaction forces. Innovative solutions are often needed to cope with these forces. This research program investigates the strength of some innovative solutions and compares them with more conventional ones. The program includes two strengths of timber, different size and strength bolts, one or two side cleats together with an overstrap solution. One hundred and forty 2m long trusses were tested in the program. The effect of transverse bolts through the nailplate and above it were also investigated. Results showed that the strength of conventional hold down systems was greater than predicted because of the reinforcing effect of the nailplate. This applied both to systems with bolts through the nailplates and to those with bolts above the nailplates. The overstrap increased the strength of the hold down systems, although estimates of its effect were sometimes clouded by changes in other parameters. The overstrap worked much better in hold down systems including two side cleats rather than one. Indicative design values have been calculated for each system

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Holdings
Item type	Current library	Collection	Call number	Status	Date due	Barcode
Books	Australian Emergency Management Library	BOOK	F624.176 INV (Browse shelf(Opens below))	Available		005745841

Includes index.

Bibliography: p. 17.

Wide span trusses and especially girder trusses can concentrate wind uplift pressures to high reaction forces. Innovative solutions are often needed to cope with these forces. This research program investigates the strength of some innovative solutions and compares them with more conventional ones. The program includes two strengths of timber, different size and strength bolts, one or two side cleats together with an overstrap solution. One hundred and forty 2m long trusses were tested in the program. The effect of transverse bolts through the nailplate and above it were also investigated. Results showed that the strength of conventional hold down systems was greater than predicted because of the reinforcing effect of the nailplate. This applied both to systems with bolts through the nailplates and to those with bolts above the nailplates. The overstrap increased the strength of the hold down systems, although estimates of its effect were sometimes clouded by changes in other parameters. The overstrap worked much better in hold down systems including two side cleats rather than one. Indicative design values have been calculated for each system

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