き裂欠陥を有する配管の荷重 : 変形量関係のモデル化手法(機械力学,計測,自動制御)

概要

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We developed a simplified modeling technique with a nonlinear spring element for seismic analysis of cracked pipes. Cracked pipes produce asymmetric and degrading behavior due to fatigue crack growth under seismic loads. Therefore, considering such behavior is necessary when developing a model for evaluating the seismic responses of cracked pipes. We modified the deteriorating distributed element developed by Iwan et al. so that the model can simulate the behavior of degrading cracked pipes. The modified model is a parallel combination of 1) an elastic element, 2) an elastoplastic element, 3) modified deteriorating elements and, 4) a dashpot. Among these, the modified deteriorating elements reproduce asymmetric and degrading behavior by reducing each yielding load for positive and negative deformation. We applied the modeling technique to simulate a cyclicloading test of a cracked pipe. Comparisons of load-deformation relationships indicated that the modified model reproduced the behavior of degrading cracked pipes.
一般社団法人日本機械学会の論文
2006-11-25