Research on Seismic Isolation Device of High-Low Towers Cable-stayed Bridge for High Speed Railway
By analyzing the seismic reduction and isolation effects of various types of seismic isolation devices on high speed railway mixed beam cable-stayed bridges,a reasonable seismic isolation device was selected.Taking the newly built high speed railway mixed beam cable-stayed bridge with a main span of 230 m across the Yinghe River in Fuhuai(Fuyang-Huaibei)as the research object,a finite element model of lead rubber bearings,friction pendulum seismic isolation bearings,and viscous dampers was established.Nonlinear time history analysis method was used to analyze the seismic response of target functions such as tower bottom bending moment and beam end displacement.The results show that using lead core rubber bearings can reduce the bending moment at the bottom of the tower by 49.9%.By using friction pendulum seismic isolation bearings,the bending moment at the bottom of the tower can be reduced by 54.3%.By using viscous dampers,the bending moment at the bottom of the tower was reduced by 62.0%.For high speed railway mixed beam cable-stayed bridges with high-low towers,the viscous damper isolation device is more reasonable and appropriate design parameters are provided.
NETL
NSTL
万方数据
