Analysis of Oscillatory Motion of Sin Girders With Semirigid Joints

n girders with corrugated web, semirigid joints alter damping and vibrational frequency, which indirectly produces a change in the integrated stiffness of girders K, thus diversifying the magnitude of displacement amplitudes of forced vibration [4, 5, 6]. On the basis of investigations relying on the method of vibration measurements, rotational stiffness of semirigid end-plate connections was determined [2, 3]. Using two viscoelastic material models, namely the Voigt–Kelvin and the Hook–Voigt–Kelvin ones, an analysis of oscillatory motion of the eight SIN WTA 500/300×15 girders with semirigid joints at the midspan of concern was made. The pattern of displacement amplitude of forced vibration was analysed. The effect of variation in rotational stiffness of connections Sj on integrated stiffness of girders K and on damping was shown.