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Journal of Wood Science

Official Journal of the Japan Wood Research Society

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Effects of pretension in bolts on hysteretic responses of moment-carrying timber joints

Journal of Wood Science volume 54, pages 114–120 (2008)Cite this article

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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Authors and Affiliations

  1. Laboratory of Bridge and Structural Design Engineering, Graduate School of Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-Ku, Sapporo, 060-8628, Japan

    Ali Awaludin

  2. Graduate School of Agriculture, Hokkaido University, Sapporo, 060-8589, Japan

    Takuro Hirai & Yoshihisa Sasaki

  3. Graduate School of Engineering, Hokkaido University, Sapporo, 060-8628, Japan

    Toshiro Hayashikawa & Akio Oikawa

Authors
  1. Ali Awaludin
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  2. Takuro Hirai
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  3. Toshiro Hayashikawa
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  4. Yoshihisa Sasaki
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  5. Akio Oikawa
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Correspondence to Ali Awaludin.

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Awaludin, A., Hirai, T., Hayashikawa, T. et al. Effects of pretension in bolts on hysteretic responses of moment-carrying timber joints. J Wood Sci 54, 114–120 (2008). https://doi.org/10.1007/s10086-007-0914-8

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  • DOI: https://doi.org/10.1007/s10086-007-0914-8

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