Seismic Fragility Analysis Of Steel Roof-Concrete Frame Structure Of Railway Passenger Station

Small and middle size railway passenger stations are the focus of the construction of large scale high-speed rail station these years. Due to the lack of abundant attention to seismic design, the specific performance indicator has not been formed yet. In this paper, the research on earthquake disaster behavior、the analysis of seismic vulnerability and the assessment of the seismic risk of the structure are carried out for the typical steel roof-concrete frame structure system with large bay or big openings to small and middle size railway passenger station in the actual project, based on incremental dynamic analysis.The main contents of research are as follows:(1) Based on the actual dynamic time history analysis of shaking table test model, the settings of the parameters in the modeling process of ABAQUS are carried on the exploration. Combined with the data of shaking table test, the method of modeling and the reliability of settings of the parameters are verified.(2) Take a typical steel truss-concrete frame structure system with large bay or big openings for example, the different responses of the frame structure and space truss structure in the the station structure under the horizontal, vertical and the three-dimensional earthquake are compared. The proposal of the direction for the ground motion input is given during the ground motion time history analysis in such structures.(3) The three-dimensional of eight earthquake records are selected as ground motion input for the model of three selected typical steel truss-concrete frame structure system with large bay or big openings. Peak ground acceleration and the most storey drift angle are selected as ground motion intensity index and structural damage index respectively to get the IDA analysis. Weak layer and failure mechanism are investigated in these calculation examples. Four performance levels are set as the determinant of the collapse state and the vulnerability curves are plotted to assess the earthquake risk.(4) The three-dimensional of eight earthquake records are selected as ground motion input for the model of a selected typical steel shell-concrete frame structure system with large bay or big openings, whose responses are compared with that of the hybrid structure system of steel truss and concrete frame with large bay or big openings. The structural performance level threshold and the accuracy of the method of structural seismic risk assessment are verified in this paper.