METHOD FOR DIAGNOSING DETERIORATION OF ROAD BRIDGE JOINT MEMBER

摘要

PROBLEM TO BE SOLVED: To provide a method for easily and reliably determining a deterioration degree of a road bridge joint member.SOLUTION: A method for diagnosing deterioration of a road bridge joint member is provided that comprises: setting a sound/video image sampling unit on a shoulder of an expressway and sampling sound pressure waveform data of generated sound of a road bridge joint member and video image data thereof; calculating a reference peak value Pand a high-range peak value Pfrom a frequency spectrum obtained by performing Fourier analysis of the sound pressure waveform data to acquire a peak ratio R=(P/P); determining a deterioration degree of the road bridge joint member from the peak ratio R; estimating a sound source direction (θ, φ) of the generated sound using the sound pressure waveform data; and creating a deterioration diagnosis video image G in which the sound source direction (θ, φ) and a graphic representing the deterioration degree are displayed.SELECTED DRAWING: Figure 9