RESPONSE REDUCTION EFFECT AND APPLICATION SCOPE OF ADDITIONAL SUPPORTS REINFORCEMENT FOR A HIGH-SPEED RAILWAY PRC BRIDGE

Abstract

 In order to mitigate resonance induced significant vibration of high-speed railway bridges under train passages, additional supports reinforcement that new supports are added into the span have been studied. However the reinforcement effect, bridge dynamic characteristics and the bending moment distribution also change significantly depending on the position and the supporting stiffness of additional supports. In this study, the numerical model was established and the structural parameters are updated according to the measured data of a target bridge, and the full-scale additional supports movement experiments performed on the actual bridge could verify the high evaluation accuracy of updated numerical model for the additional support reinforcement effects. In addition, parametric study using verified numerical model clarified that the additional supports with 2 m distances on both sides or 3 m distance on one side from the existing supports can provide sufficient reductions of the maximum displacement. And these reinforcement can satisfy the various constraints even if additional supports have the supporting stiffness less than half of the existing supports.