MASS SIMULATION AND AMPLITUDE CONVERSION OF BRIDGE SECTIONAL MODEL TEST FOR VORTEX-EXCITED RESONANCE

Wind tunnel test of sectional model is an important means for determining lock-in region of wind speed and maximal amplitude of vortex-excited resonance.The simulation formulae for the mass system of sectional model are derived based on the differential equation of vortex-excited resonance and an experimental linear model of vortex-excited force with self-excited behavior.The conversion relationships between the resonant amplitudes of the sectional model and the prototype bridge are also established,and the correction coefficients of mode shape and damping are presented as well.The effects of the three-dimensional structural and vibrational behavior of prototype bridge can thus be considered in the two-dimensional sectional model test of vortex-excited resonance via the proper mass simulation and amplitude conversion by means of the derived formulae.