Effects of pretension in bolts on hysteretic responses of moment-carrying timber joints |
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Authors: | Ali Awaludin Takuro Hirai Toshiro Hayashikawa Yoshihisa Sasaki Akio Oikawa |
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Institution: | (1) Laboratory of Bridge and Structural Design Engineering, Graduate School of Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-Ku, Sapporo 060-8628, Japan;(2) Graduate School of Agriculture, Hokkaido University, Sapporo 060-8589, Japan;(3) Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan |
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Abstract: | The adoption of a concept similar to the prestressing technique used in laminated wood decks of bridge structures might increase
the initial stiffness or ultimate resistance of dowel-type timber joints by applying pretension to their bolts. This study
investigated the effect of pretension in bolts on hysteretic responses and ultimate properties of moment-carrying timber joints
with steel side plates. A pretension of 20 kN that yielded a prestress level of 1600 kPa or about 90% of the allowable long-term
end-bearing strength of spruce species was applied to the bolts of prestressed joints. The superiority of the prestressed
joint over the non-pre-stressed joint was proved by very high hysteretic damping, equivalent viscous damping ratio, and cyclic
stiffness. At any given rotation level, hysteretic damping reduction and moment resistance decrement due to continuously reversed
loads were found to be small because bolt pretensioning minimized the pinching effect. This study showed that the hysteresis
loop of the prestressed joint can be obtained by adding the frictional hysteresis loop due to pretension force into the hysteresis
loop of the non-pre-stressed joint. Despite a great increase of initial stiffness, only slight increments in ductility coefficient
and ultimate moment resistance were found in the prestressed joint. |
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Keywords: | Pretension Hysteretic response Bolted joint Pinching effect |
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