Dewey, Justin, and Tuladhar, Rabin (2017) Behaviour of round notched timber sections. In: 8th Australian Small Bridges Conference. From: 8th Australian Small Bridges Conference, 27-28 November 2017, Gold Coast, QLD, Australia.

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Abstract

Timber is widely used in the construction of bridges in Australia. An interesting feature is that girders used in these structures are often round in profile. Notching of the girders end is required for seating purposes and to create levelness in the top of the structure. This reduces the strength of the girder due to concentrations of high shear and cross-grain tensile stress at the re-entrant corner. It is known that rectangular timber members with a notched slope of 1:4 will sustain significantly larger failure loads. This also appears to be the case in round notched members. Experiments undertaken at James Cook University have shown round timber members, sniped to a depth of 25% of total depth (?) and with a slope of 1:4 will, on average, achieve a load 134% higher than a member with a slope of 1:0. Initial failure is still due to tension perpendicular to the grain before shear failure ensues with slippage of the fibres parallel to the grain. A slope of 1:4 also significantly reduces the time between notch failure and shear failure occurring by a factor of three.

Item ID:	52866
Item Type:	Conference Item (Presentation)
Keywords:	timber girder, notch, round sections, shear failure
Date Deposited:	15 May 2018 03:18
FoR Codes:	09 ENGINEERING > 0905 Civil Engineering > 090506 Structural Engineering @ 60% 09 ENGINEERING > 0905 Civil Engineering > 090502 Construction Engineering @ 40%
SEO Codes:	87 CONSTRUCTION > 8703 Construction Materials Performance and Processes > 870305 Timber Materials @ 100%
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