Seismic Performance Analysis Andseismic Vulnerability Assessmentof Rc Circular Bridge Piers Undermarine Environment

Chloride Erosion of reinforced concrete directly affects the seismic performance of reinforced concrete bridge piers in the marine environment.As an important bearing component of the bridge,deterioration of reinforced concrete bridge piers were more prone to failure state of sorts under the strong earthquake and threat to the safety of human life and property.With the development and utilization of the marine environment that a large number of Offshore Bridge was constructed in recent years,the seismic performance of reinforced concrete bridge was analysed in marine environment of great significance.In this paper,the reinforced concrete rule of marine environment based on chloride ion erosion,using finite element software ABAQUS analysis on seismic performance of different service time.(1)This paper reviewed the research status of osmotic chloride on domestic concrete,and reinforced concrete piers under deterioration for the situation of earthquake vulnerability research,summarizes the research contents and methods of analysis.(2)In the previous analysis on a large amount of chloride ion permeation experiments with different kinds of concrete,considering the penetration of dry wet cycle in marine environment factors on the concrete effects of chloride ion,and combining with the Fick's second law fitting different experimental chloride ion penetration diffusion coefficient in concrete,determine the empirical coefficient m value.Using the initial corrosion time probability curve Fick's second law for reinforced concrete.(3)By changing the pier seismic capacity analysis of reinforced concrete bridge piers in the marine environment,using Pushover method to analyze the different service time under various conditions the load displacement hysteretic curve,skeleton curve,the condition of horizontal resistance and displacement of pier under the extension of the performance size,and the seismic performance of reinforced concrete bridge piers.(4)Using the analysis method of aseismic capacity of bridge pier column dynamic time history analysis,considering the longitudinal reinforcement and concrete deterioration,deterioration of concrete and stirrups,longitudinal reinforcement,stirrup and concrete materials of three kinds of common deterioration seismic capacity of piers.By theearthquake,analysis of pier top horizontal force,acceleration of the pier top the bottom of the pier,the pier bottom bending moment and reaction force to research on seismic capacity of material deterioration on the piers.(5)The damage index of pier top drift rate based on the seismic vulnerability analysis of piers material uncertainty and seismic uncertainty on reinforced concrete column piers.Considering the evaluation in the whole life cycle of the column damage probability.16 seismic waves and 8 sets of random material parameters were analysed with IDA analysis model to get seismic response the value of data,statistical analysis of seismic response of the mean and standard deviation as the data of seismic demand model,to analyze the seismic vulnerability curves of different service time piers.