既存構造物の全体損傷の同定に関して

概要

論文の詳細を見る
To predict the lifetime of existing structures, structural damage state should be monitered and identified. Model parameters,such as natural frequencies,damping ratios and mode shapes, are useful indicators to estimate the global damage of existing structures. An efficient method is proposed to identify these modal parameters using response time-series of existing structures subjected to ambient vibrations. The proposed method is composed of three stages: (1) AR model is fitted to response time-series, (2) ARMA model is constructed from AR model by applying the inverse function method, and (3) the transfer function of ARMA model is put into the parallel form realization by partial fraction expansion. Numerical examples are presented to verify the proposed method for a shear beam model and a plane truss model. It is proved that natural frequencies and damping ratios may be identified with reasonable accuracy by selecting the optimal sampling time interval and the order of ARMA model and, moreover, mode shapes may be also identified if response time-series are monitored at several locations.
一般社団法人日本建築学会の論文
1992-03-20