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People please help me about my problem. I have measurement of vibrations of concrete traffic bridge under random dynamic load (cars, trucks). Diagrams that I have are: amplitude [mm/s] / time[sec] and amplitude [??] / frequency [Hz]. Every diagram (graphic) is available for longitudinal, transverzal and vertical direction. How can I get a stiffnes of bridge (bridge is simple suported beam), and his modes????? Please help!