Effect of Structural Geometry on Evaluation Accuracy in Fatigue Evaluation of Information Board using Acceleration Measurement

Abstract

This research is about the quantitative evaluation method of cumulative fatigue damage by a constant acceleration-strain translation factor independent of the structural geometry in the fatigue evaluation of information board poles by acceleration measurement. The target is a gate-type information board, and an F-type information board. Since the translation factor used to convert the measured acceleration into strain is differs for each information board and requires measurement strain/acceleration or FEM analysis, in this research, to simplify the method, the constant translation factors are considered. The accuracy of evaluating the cumulative damage using the constant translation factor was compared with the accuracy of other evaluation methods. The constant translation factor method overestimated many target structures in the out of-plane direction. For case where the prediction error is large, it is considered necessary to set the translation factor depending on the level of the geometry based on the results of the FEM analysis.