Seismic capacity analysis of large span RC frame structure converted with inclined columns on the metro superstructure
To study the seismic resistance of the long-span RC frame structure with oblique column on the subway superstructure,the in-situ dynamic test of a subway superstructure is carried out,and the natural frequency,vibration mode and damping of the structure are analyzed.Then the finite element software SAP2000 is used to establish the spatial model of the structure,and the dynamic characteristics,static elastic-plastic analysis and elastic time-history analysis are carried out.The results show that the inclined columns make the bottom form a triangular frame area,which shows down the development of the plastic hinge of the structure.At the same time,it meets the design requirements of"strong column and weak beam",which significantly improves the integrity and stability of the RC frame structure.Under the earthquake,the bottom support force and bending and shear composite force performance of the oblique column RC frame structure is strengthened,resulting in the seismic failure mode of the frame structure being changed compared with the ordinary frame,and the top layer becomes a weak layer.The analysis results provide a reference for the design of the RC inclined column conversion structure.
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