SN490B鋼を用いた梁端溶接接合部の疲労載荷実験

概要

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The purpose of this research is to examine the fatigue behavior, the fatigue life and the fatigue damage assessment at variable stress amplitude in the welded beam ends of the beam-to-column connections with the SN490B class steel. The bending fatigue testing in the beam-to-column connections's model specimen was carried out. 1. In the constant stress amplitude testing, the fatigue behavior was clarified. 2. In two step multiple stress amplitude testing, the accumulated fatigue damage based on the Palmglen-Miner rule was obtained. When the amplitude difference (ΔN) was 2.4, the lowest value of the accumulated fatigue damage (D) was 0.37. 3. The application of the Palmglen-Miner rule under the variable load has danger by which the fatigue life is undervalued. In the welded connection the accumulated fatigue damage is assessed by a value which is very smaller than 1. 4. In a variable stress amplitude, the cause to which cumulative damage factor decreases :The residual strain by the plastic deformation influences the fatigue life. The fatigue life is used to assess the fatigue damage, therefore, damage by the crack initiation is not correctly assessed.
一般社団法人日本建築学会の論文
2003-03-20