Comparative Study On Seismic Design Method Of Crossing Subway Station Structure

Abstact:With the domestic continual construction of underground subway structures, subway has become the main solution to solve the traffic problem in the city. However, seismic performances of underground subway structures have not been recognized insufficiently, and seismic design has been being still backward. Compared with the buildings on the ground, the impact, which will cause people injury and property damage, of earthquake disaster of underground structures is more serious. Therefore, seismic design of underground structure is especially important. Through Midas-GTS finite element software, in this thesis Tai Feng Road station of Nanjing was studied to analyze and compare the behavior of underground structure on dynamic time history analysis method, response displacement method and equivalent seismic inertial force method. Mainly finished the following work:(1) Based on the theory of viscous-spring medium, this thesis puts forward a viscous-spring artificial boundary suitable for underground structure dynamic calculation, and the calculation accuracy is higher than the elastic field.(2) Tai Feng Road station of Nanjing was studied to analyze the behavior of underground structure. It shows When crossing subway station effected by unilateral wave, the underground structures, parallel to the direction of propagation of wavelengths, is beneficial to the vertical of structure seismic performance; but during the earthquake happening, the standard section of wall and panel where shear stress may produce horizontal and vertical direction of shear failure.(3) By comparing three-dimensional dynamic response results of Tai Feng Road station of Nanjing under the action of seismic wave by different angles, it shows that structural response behavior is the strongest when seismic wave inputs longitudinally; the earthquake wave has little influence on he peak force of the intersections.(4) The results obtained by response displacement method are consistent with those got by the dynamic time history analysis method but the error of structural force of top storey is large; on this basis, a modified response displacement method has been proposed, considering the effect of vertical soil displacement under horizontal seismic action, its calculation result to a certain extent reduces the error and can be applied to the internal force calculation for entire station structure.(5)Compared with the structural behavior on three-dimensional dynamic time history analysis method, the force of equivalent seismic inertial force method has big error, and its application in seismic simplified calculation has to examine.