||ひずみ指標を用いた鉄道 RC 構造物の疲労損傷分析
FATIGUE DAMAGE ANALYSIS OF RAILROAD RC STRUCTURES BY DAMAGE INDEXS BASED ON STRAINS
52016-03-24 , 法政大学大学院デザイン工学研究科
The purpose of this study is to verify the applicability of damage indexes relating to strains calculated in nonlinear FE analysis. The experiment and the numerical analysis of reinforced concrete (RC) simple beam were conducted to clarify the influence of loading speed on their fatigue lives. The fatigue lives obtained in both experiments and FE analysis were generally decrease when loading speed increased. Furthermore, the full scale railroad viaduct was modeled by FE analysis. Fatigue life on the full scale model was decreased with increase of loading speed, even though resonances were observed in some cases. On the basis of FE analyses,fatigue damages were estimated by damage indexes, those are; the second invariant of deviation strain √𝐽′2 and consumed strain energy 𝑊𝑛. The progress of damage was captured by indexes, however fatigue livesdetermined by indexes were not consistent with those calculated from conventional methods.