Seismic isolation analysis of highway multilink continuous girder bridges
This study focuses on the seismic isolation analysis of highway multilink continuous girder bridges and op-timization of the lead-core rubber and friction pendulum bearings.The variations in seismic response among piers were examined first using nonlinear time history analysis of multilink finite element models.The seismic isolation and energy dissipation capabilities of lead-core rubber and friction pendulum bearings were then evaluated and com-pared.In the end,the parameters and layout of the isolation bearings were optimized.The results reveal that the seismic response of the junction pier between adjacent links is generally higher than that of the inner piers by ap-proximately 20%and can even reach 75%when the spans above the junction pier exhibit large difference.The lead-core rubber bearing exhibits superior displacement-limiting and energy dissipation capacities during high inten-sity earthquakes.A larger stiffness prior to yielding,along with lower yield strength and post-yielding stiffness,can enhance the energy dissipation capacity.Instead,the friction pendulum bearing can demonstrate an effective isola-tion effect even during minor earthquakes.A smaller the sliding friction coefficient and a larger radius of curvature lead to a better seismic isolation effect.By arranging more isolation bearings at the junction piers,the problem of uneven responses among piers can be improved while maintaining an acceptable isolation rate.This study offers considerable engineering implications.
国家科技期刊平台
NSTL
万方数据
维普
