| In order to adapt to the rapid development of high-speed railway requirements, Integrated Station-Bridge Structure which have remarkable advantages is widely used in the new station. It has some advantages such as large space stiffness, strong anti-seismic capability and so on. It is widely used in the existing high-speed elevated station. Because of lacking a seismic design for this kind of type structure, so generally the upper structure of the station to meet building seismic design code, the lower structure of the station to meet the railway engineering methods for seismic design. Because the different specification design concept and the complexity of the structure, it is difficult to do the seismic analysis and design of the whole structure. Under the action of the earthquake, it is difficult to accurately understand the seismic response of this structure, the plastic yielding mechanism and its potential weak link. So it is hard to do right evaluation on seismic performance of structure. Based on Tianjin South Station, this paper do the seismic response analysis of structure through the reasonable simplified model, and then evaluate the seismic performance of this structure. The research work of this paper is as follows:(1) Using MIDAS/GEN software, analysis of natural vibration characteristics by the simplified model of the structure. The results show that the vertical quality and stiffness is uneven distribution.Due to the influence of the structural floor open hole, the the reverse effect is larger.(2) Through the spectrum analysis of minor earthquakes and moderate earthquake, the indexes such as the interlayer displacement, angle of structure, shear weight ratio and stiffness ratio meet the requirements of specification limits. Then use the dynamic time history analysis method to validate the results of response spectrum analysis.(3) Gain the performance of the points by the structure static elasto-plastic analysis. Evaluate the seismic performance of the points. Then using the dynamic time history analysis to evaluate the structure of the overall seismic performance.(4) Based on the results of structural static elasto-plastic analysis, taking the spectral acceleration as the representative of the ground motion parameter values and the biggest displacement between floors of the structure angle as performance index of structural vulnerability. Drawing out the structure of vulnerability curve under different performance index. |
