Mechanism of Pull-out Performance of Lagscrewbolted Timber Joints I. Effects of lead hole diameter, embedment depth, embedment direction and edge distance on pull-out performance

DOI 6 Citations
  • NAKATANI Makoto
    Research Institute for Sustainable Humanosphere, Kyoto University
  • KOMATSU Kohei
    Research Institute for Sustainable Humanosphere, Kyoto University

Bibliographic Information

Other Title
  • ラグスクリューボルトの引抜き性能発現機構（第１報）先孔直径，埋込み深さ，埋込み方向，縁距離が引抜き性能に与える影響
  • Effects of lead hole diameter, embedment depth, embedment direction and edge distance on pull-out performance
  • 先孔直径, 埋込み深さ, 埋込み方向, 縁距離が引抜き性能に与える影響

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Description

At present, moment-resisting connections for glulam constructions are widely constituted as drift-pin joints with insert-steel gusset plates, as well as bolted joints. These joints consume much steel and require complex design calculations. Therefore, Lagscrewbolts® were developed as a simple and economical timber connector. Lagscrewbolts have a lagscrew type thread on the outside surface and are threaded like a nut on the inside at one end of the shank.<br>In this study, a series of tests were conducted to clarify the effects of lead hole diameter, embedment depth, embedment direction and edge distance on the pull-out resistance of Lagscrewbolts. Lagscrewbolts having 30 mm top thread diameter and 25 mm root diameter were used. For timber members, Douglas-far glulam of E105-F300 grade were used.<br>The results obtained were as follows :<br>1) The optimum lead hole diameter was 27 mm.<br>2) Maximum pull-out load (Pmax) vs. embedment depths, and slip modulus (Ks) vs. embedment depths showed positive correlations. These relationships were almost linear.<br>3) The maximum pull-out load (Pmax) parallel to the grain was 0.75 times of that for perpendicular to the grain, and the pull-out slip modulus (Ks) parallel to the grain was 3 to 6 times of that for perpendicular to the grain.<br>4) The suitable edge-distance was thought to be more than 1.5d (d is the thread top diameter of the Lagscrewbolt).

Journal

  • Mokuzai Gakkaishi

    Mokuzai Gakkaishi 51 (2), 125-130, 2005

    The Japan Wood Research Society

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Details 詳細情報について

  • CRID
    1390001206351854464
  • NII Article ID
    130004468848
  • DOI
    10.2488/jwrs.51.125
  • COI
    1:CAS:528:DC%2BD2MXlt1Ojtrc%3D
  • ISSN
    18807577
    00214795
  • Text Lang
    ja
  • Article Type
    journal article
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
    • KAKEN
  • Abstract License Flag
    Disallowed

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