Applicability of Thin Steel Plate with a Crack to Estimating of Fatigue Damage on Bridges (Report Ⅰ): Investigation of estimating method and applicability under constant amplitude loads

摘要

Thin steel plates, which have initial cracks at the center, are used as the Sacrificial Test Pieces in this study. "The Sacrificial Test Piece" is attached to the member of a main structure in order to evaluate the damage before the appearance of a crack in the member of the main structure. The purpose is to show the practical applicability of "the thin steel plate with crack as the Sacrificial Test Piece" for monitoring the fatigue damage parameters on bridge members. In this research, it is decided that the applicable range of crack length and the crack propagation properties of the thin steel plate to evaluate the fatigue damage parameter are obtained. And it is suggested that the fatigue damage parameter under constant amplitude loading can be estimated by the thin steel plate with practical accuracy.