Research On Seismic Analysis Of The "Integration Construction-bridge" Structure Based On Performance

In recent years,China's urban rail transit is developing rapidly."Integration construction-bridge" structure station which combines building structure and bridge structure has been more and more applications because of the advantage of excellent economy,great view for the urban landscape,and avoiding the collision between building structure and bridge structure effectively.The failure mechanism and weak part of the structure under the strong earthquake is difficult to be determined due to the differences of the seismic design code and the seismic design concept between buildings and bridges.The station structure is the key infrastructure in rail transit,whose destruction would cause great casualties and property damage.It is necessary to have a clear understanding of the seismic performance of such structures.In this paper,the "Integration construction-bridge" structure of guzhenkou south railway station in Qingdao was modeled and the seismic performance was analyzed based on performance.In summary,the following works have been done in this paper.(1)The seismic fortification level,performance level,and performance target matrix of the "Integration construction-bridge" structure were proposed based on the domestic and international norms and research results.(2)The finite element model with Midas Gen was built for IDA analysis of structural station hall and the IDA curves were got.The IDA curves and performance points under three percentile curves were calculated to provide a basis to evaluate the seismic performance of such structures.This kind of structure design is relatively conservative according to conclusion.The structural plastic development was analyzed and the structure mechanism yield was determined.The weak parts of the structure are pier column and side span longitudinal beam.(3)The fiber finite element model with Midas Civil was built for moment-curvature analysis and earthquake response analysis.By changing the axial compression ratio,concrete strength,longitudinal bar strength,longitudinal reinforcement ratio and sectionsize,the impact of these factors on the pier cross-section ductility were discussed and some useful conclusions to control the pier ductility were got.The ductility performance of the structure about the displacement state,energy-consuming state and section damage state was checked under large earthquake.