Lateral vibration suppression of highway bridge by using frequency modulated particle damper in earthquake environment

Abstract

In order to study the seismic control effect and mechanism of particle damper in the transverse structure of highway’s bridge, a 1:20 scale model of a typical highway bridge is designed and manufactured, and a frequency modulated particle damper is designed and manufactured, which can be used in the test model. The seismic simulation vibration array test is carried out on the model bridge before and after the particle damper is set. By changing the filling rate, particle material, particle size and installation position of the particle damper, the power spectral density at the middle or top of the beam steel column is measured, and the total energy response of the steel column structure is calculated. The influence and law of the particle damper on the vibration amplitude of the steel column are explored. The test results show that: the proposed frequency modulated particle damper does not appear particle accumulation phenomenon in the test; it has better damping effect on the transverse seismic response of the main beam of the scale model bridge, and can reduce the peak displacement response of the main beam. The energy response value is 1.016 kg (m/s2)2/Hz.