Deformation direction decision manner and deformation direction decision device null of the structure in the time

摘要

PROBLEM TO BE SOLVED: To judge the deformation direction of a structure in the case of an earthquake by a method wherein a tremor in a measuring point (a) and that in a measuring point (b) on the side of the structure are always measured, a prescribed processing operation is performed and the ratio of a spectrum Fa in the measuring point (a) to a spectrum Fb in the measuring point (b) is found. ;SOLUTION: A pickup PU1 is installed in a measuring point (a), a pickup PU2 is installed in a measuring point (b), and two obtained vibration waveform data are amplified separately by an amplifier 10 so as to be output to a computing and processing part 20. Then, track data in the measuring points (a), (b) in the horizontal direction are computed by a tack processing part 21, the respective vibration waveform data are Fourier-transformed separately into vibration-number region data by a transform part 22, a Fourier spectrum Fa and a Fourier spectrum Fb are found, and the ratio of the Fourier spectrum Fa to the Fourier spectrum Fb is found by a comparison part 23. When an integrated value which is obtained by subtracting 1.0 from the ratio of the spectrums is larger than 0, it is judged that a structure is deformed to the side of the measuring point (a). When it is smaller than 0, it is judged that the structure is deformed to the side of the measuring point (b). When it is 0, it is judged that the structure is not deformed.;COPYRIGHT: (C)1998,JPO