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2011 Fiscal Year Final Research Report

Estimation of lateral resistance timber joints considering dynamic responsive characteristics

Research Project

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Project/Area Number 21380105
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Wood science
Research InstitutionHokkaido University

Principal Investigator

HIRAI Takuro  北海道大学, 大学院・農学研究院, 教授 (20173205)

Co-Investigator(Kenkyū-buntansha) SAWATA Kei  北海道大学, 大学院・農学研究院, 助教 (10433145)
UEMATSU Takeyishi  北海道立総合研究機構, 建築研究本部・北方建築総合研究所・環境科学部, 研究員 (60462347)
TODA Masahiko  北海道立総合研究機構, 森林研究本部・林産試験場・性能部, 研究員 (60446317)
Project Period (FY) 2009 – 2011
Keywords強度 / 木質構造
Research Abstract

Dynamic tests of nailed joints are conducted under harmonic and white-noise waves. The principal results are as follows : (1)Dynamic response of nailed timber joints is clearly frequency dependent. (2)Under harmonic waves, nailed timber joints break in failure modes typical under static loading in resonance with the frequencies corresponding to safety limit stiffness. (3)Nailed timber joints once respond sensitively to the frequencies corresponding to damage limit stiffness, however, they do not break immediately in failure modes typical under static loading because of cyclic degradation. On the other hand, nailed timber joints may break in low-cyclic bending fatigue failure when they are subjected to many cycles, even if input accelerations are low. (4)The dynamic behavior above under harmonic waves is observed under white-noise waves consisting of similar frequency components. (5)Dynamic behavior of nailed shear walls, which are a model of multiple joint systems, behave in the same way as predicted from the behavior of single nailed joints. These test results show that the responsive characteristics of timber constructions vary due to change in equivalent stiffness along the static load-slip curves of single joints, structural subassemblies and whole structures. Test results also show that the low-cyclic bending fatigue failure of nails may lead timber constructions to critical collapse when the seismic forces act for many seconds and/or repeatedly, even if the maximum accelerations are below the damage limit.

  • Research Products

    (1 results)

All 2012

All Journal Article (1 results) (of which Peer Reviewed: 1 results)

  • [Journal Article] Dynamic response of wall-floor joints of wooden light-frame constructions under forced harmonic vibrations2012

    • Author(s)
      T. Hirai, K. Sawata, A. Awaludin, Y. Sasaki and T. Uematsu
    • Journal Title

      Journal of Wood Science

      Volume: 58 Pages: 128-134

    • Peer Reviewed

URL: 

Published: 2013-07-31  

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