FATIGUE STRENGTH OF WEB-GUSSET WELDED JOINTS IN I-SECTION GIRDER UNDER MOVING LOADS

DOI Web Site 3 References Open Access
  • MORI Takeshi
    法政大学 都市環境デザイン工学科
  • MATSUI Yoshiaki
    法政大学大学院 デザイン工学研究科都市環境デザイン工学専攻［現在，株式会社東京鐵骨橋梁］
  • SATO Ayumu
    土木研究所 構造物メンテナンス研究センター
  • HARADA Hideaki
    土木研究所 構造物メンテナンス研究センター
  • MURAKOSHI Jun
    土木研究所 構造物メンテナンス研究センター［現在，首都大学東京 大学院 都市環境科学研究科］

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Other Title
  • 移動荷重を受ける鋼I桁面外ガセット溶接部の疲労強度

Abstract

 Fixed point load fatigue tests (four points bending tests) and the moving load fatigue tests (wheel load driving tests) on I-section girder specimens with web-gusset welded joints have been performed in order to make clear fatigue crack initiation and propagation behavior from the weld toe of the joint and the fatigue strength under variation in principal stress direction. The test results suggested that the fatigue strength under moving loads is lower around 20 to 30% than the strength under the fixed point loads, and fatigue crack extending along the weld toe is long compared with that in fixed point loads, and the fatigue crack after leaving from the weld toe propagates in more inclined direction compared with the direction perpendicular to the principal stress direction.

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