PROCESS OF VIBRATION TEST OF FRAMEWORKS OF BRIDGE STRUCTURES Russian patent published in 1999 - IPC

FIELD: measurement technology, testing. SUBSTANCE: mobile load in the form of natural traffic flow moving over framework and exciting forced and natural vibrations is applied to framework. Vibrations are recorded in several points. Frequency and mutual frequency-phase spectra of vibrations are computed for all points. Frequency of natural vibrations is determined by maxima of mutual frequency-phase spectra summed for all measurement points. Natural frequencies so found are subtracted from frequency spectra and dynamic coefficients are judged by maximal and average values of forced vibrations. EFFECT: achievement of high accuracy of measurement of dynamic characteristics of vibratory process of frameworks of bridge structures under action of mobile load without stoppage of traffic flow. 1 dwg