Research On Seismic Performance Of Underground Large Space Station Structure

In the past two decades,people’s living standards have improved,and they also want to pursue a faster and more comfortable way to travel.The subway is the first choice for urban transportation,avoiding morning and evening peak congestion.The research needs of the earthquake resistance of subways are becoming more and more urgent,and the earthquake resistance research of subways is getting more and more widely.So far,there have been more and more scientists at home and abroad concerned with the corresponding seismic load in the station.Looking back at the collapsed and damaged subways during earthquakes at home and abroad,resulting in irreparable casualties and economic losses,it is particularly important to study the seismic resistance of the station.This article mainly makes reasonable assumptions and simplifications,and uses finite element software to establish a time-history analysis of the station model of Harbin No.3Subway.The main research contents of this article include:(1)In the analysis of the seismic performance of the structure,the influence of the soil surrounding the structure was fully taken into account.ANSYS finite element simulation was carried out on the actual project of Lingjiang Road Station of Harbin No.3 Subway Station to establish the finite element two of the soil-structure three-story and three-span frame structure.Dimensional model,and then carry out modal analysis of the structure to get the natural frequency of the structure.(2)After establishing a viscoelastic artificial boundary model,the seismic wave acceleration under horizontal,vertical,and coupling effects are input to the two-dimensional site structure model,respectively,to obtain the internal force and displacement values under the action of unidirectional seismic waves and coupled seismic waves.Vertical seismic waves cannot be ignored in the analysis of seismic performance.(3)Three seismic waves(Harbin,Taft,artificial waves)were input into the established finite element model,and the response of the structure to the three seismic waves was analyzed separately.It was obtained that the displacement angle of each layer under the action of the three frequent earthquakes was sufficient for earthquake resistance.The design specification and the bottom displacement angle are the largest.The internal force and displacement value of the structure under the Harbin seismic wave are the largest.The bending moment and shear force gradually increase from the first floor to the second floor.The connection between the bottom slab and the central column will be set.Focus on earthquake resistance.(4)Analyze the influencing factors of the earthquake resistance of the structure,and examine the changes of internal force and displacement caused by the change of the elastic modulus of the soil surrounding the structure,the elastic modulus of concrete and the thickness of the soil covering the upper part of the structure.The increase of the rigidity of the structure will also enhance the seismic performance of the structure,and the main seismic impact factor under the three factors is the thickness of the overlying soil layer on the upper part of the structure.