Abstract:Based on the national requirements for the prevention and control of the environmental noise pollution of the traffic trunk line and the vigorous advocacy of green traffic, and considering the deficient noise reduction function and effect of various expansion devices at present, a new type of noise reduction and vibration attenuation expansion device with excellent performance is researched and developed to reduce the environmental pollution caused by the noise of highway and urban bridge projects. The finite element simulation analysis of the bearing capacity limit state, normal use limit state and fatigue performance of the expansion device shows that the analysis results meet the requirements of the code.