Seismic Analysis Of A Subway Station A Underground Subway Station In Lanzhou

With the rapid development of our country’s economy and the gradual expansion of the scale of urban construction,this will inevitably lead to a tight demand for land resources.Subway can solve these problems.In China,earthquakes often happen.If a large earthquake occurs at this time,it will bring immeasurable losses to property and personal safety,so the study of underground station seismic potential will not be delayed.However,The Code for Seismic Calculation of Urban Rail Transit Structures(GB/T51336-2018),which was recently issued by the state,still does not provide a clear explanation for the horizontal relative displacement of the ground and the stiffness parameters of the foundation reaction spring;And in different situations,which seismic analysis method is more effective and accurate calculation still needs to be determined by the industry.We will analyze earthquake resistance on an underground station of Lanzhou Metro Line 1using Midas /GTS software.Three seismic analysis methods: response displacement method,response acceleration method and time history analysis method are used to analyze the seismic resistance of subway underground stations.The force and deformation will be compared about these columns.The confluence of the lowest floor board and column that internal force has reached the maximum.Based on the analysis results of numerical simulation,It provides different reference value for other stations.The main work of this paper is as follows:(1)The confluence of the lowest floor board and column that internal force has reached the maximum,and the structural displacement is caused by the shear force.It should be considered when designing the structure.(2)Based on the seismic response comparative analysis of the response displacement method,the response acceleration method and the time history analysis method,in the X direction displacement analysis,the lateral displacement shape of the three methods is an inverted "U" shape,but the response displacement method curve is more convex.(3)Upper interlayer displacement angle value of the three methods were bigger than the lower layer,and are less than a predetermined 1/250,indicating that the station has a better performance level of the seismic line with subsurface seismic design specification on the structure.(4)Compared with the response displacement method,shear force and bending moment of the other two methods are larger.which is consistent with the safety of the two-dimensional seismic analysis method used in actual engineering.