Safety Risk Assessment Of Seismic Structure Of In-use Seismic Isolation Beam Bridge

The disaster resistance capacity of the bridge under seismic isolation will be affected to varying degrees over time,so it is necessary to accurately assess the safety risk of the seismic structure of the bridge under seismic isolation.In this paper,a set of seismic structure safety risk assessment system suitable for in-use isolation beam bridge is established.Based on the test,the damage failure mode of local structure and the evolution law of seismic performance of the bridge pier-high damping rubber bearing series system under earthquake are studied,and the prevention and control measures of the seismic structure of the bridge are optimized.In the aspect of seismic structure safety risk assessment system of seismic isolation beam bridge,the safety risk assessment framework of seismic structure of seismic isolation beam bridge is established and the corresponding structural safety risk assessment method is selected.The damage failure modes and corresponding risk sources of the seismic structure of the in-use seismic isolation beam bridge are summarized.The quantitative index of seismic structural damage of in-use seismic isolation beam bridge and the safety evaluation level of seismic structure of in-use seismic isolation beam bridge are established.Finally,based on the above research results,a set of seismic structural safety risk assessment procedures for in-use seismic isolation girder bridges are established.In the aspect of experimental research,the damage failure mode and seismic performance evolution of local structure under seismic action of bridge pier-high damping rubber bearing series system are studied.The influence of axial compression ratio and initial state on damage failure mode and seismic performance of bridge pier-high damping rubber bearing local series structure is analyzed by experimental phenomena,hysteresis curve,skeleton curve and energy dissipation curve.And through the test results,the damage evaluation criteria of slight damage and moderate damage of pier column of seismic isolation bridge after earthquake are verified.