Study On Aseismic Design Of Metro Station Structure With Arch-cover Method

As an important transportation,urban subway in the urban construction and development plays an increasingly prominent role,the subway is not only alleviate the urban traffic pressure,at the same time also led to the city’s social and economic development,so the development of urban rail transit is imperative.Earthquake disasters of subway structure damage,however,will undoubtedly brings a great threat to the urban traffic safety,our country is a country with frequent earthquake,so we should strengthen to ensure that the urban rail traffic safety consciousness,ensure people’s personal and property safety.The subway structure seismic design,can enhance the subway structure’s ability to fight earthquake damage,so to strengthen the research of underground structure seismic performance,a more practical underground structure seismic measures,the city’s traffic order,economic and social activities,life and property safety are very important.This paper takes Qingdao metro line 1 Shui Qinggou station main body structure seismic design for the topic background,the subway station underground arch cover method for Qingdao area common structure form,the combination with the engineering geological and hydrogeological condition,considering structure may occur in the process of using a variety of load,by using the finite element software by using the "load-structure" model,according to the plane truss structure based on the finite element method(FEM)to the station main body structure design calculation;Combining with the metro station the basic requirements of seismic prevention,to relevant seismic code,using the finite element software to establish the "load-structure" model and "formation-structure" model,seismic design for the station main body structure is calculated,and the calculation results were analyzed.This paper mainly completes the following work:(1)In this paper,a systematic introduction of the arch-covered metro station,and analysis of the application scope,characteristics of use of the arch-covered metro station,the construction steps and technical requirements of a typical station,as well as its structural features and structural performance,and it is more suitable for use the construction of the concealed arch method in this "upper earth rock" formation in Qingdao.(2)This paper introduces the seismic design methods of various underground structures,summarizes their advantages and disadvantages and the applicability of engineering,and concludes that the time-travel analysis method is more suitable for the seismic design of subway structures.(3)In Qingdao metro line 1 Shui Qinggou station standard cross-section as the model,take per linear meter for lateral calculation,design by using the "load-structure" model,under the action of static,according to the plane truss finite element method to calculate,it is concluded that the principal structure internal force calculation results.(4)Static method for the station structure aseismatic calculation,determine the permanent load and variable load,and seismic load calculation,including inertia force and the active lateral earth pressure increment caused by earthquake,design by using the "load-structure" model,according to the plane truss finite element method to calculate,it is concluded that the principal structure internal force calculation results.(5)Seismic time history analysis method for the station structure calculation,according to "Qingdao metro line 1 project site seismic safety evaluation report,selection of calculation parameters,using finite element software to establish a calculation model of structure formation-time history analysis,first of all to ensure structural deformation within the scope of the permit,and then calculate every moment in the stratigraphic structure of strain and stress as well as the speed,acceleration and displacement,through these data,to determine whether the formation under the seismic action in a stable state."Load-structure" model is established,and the time history analysis of the income structure of actual X direction displacement loading on the structure,horizontal load only water pressure at the same time,the vertical load is complete,it is concluded that the principal structure internal force calculation results(6)Seismic time history analysis method for the station structure calculation,according to "Qingdao metro line 1 project site seismic safety evaluation report,selection of calculation parameters,using finite element software to establish a calculation model of structure formation-time history analysis,first of all to ensure structural deformation within the scope of the permit,and then calculate every moment in the stratigraphic structure of strain and stress as well as the speed,acceleration and displacement,through these data,to determine whether the formation under the seismic action in a stable state."Load-structure" model is established,and the time history analysis of the income structure of actual X direction displacement loading on the structure,horizontal load only water pressure at the same time,the vertical load is complete,it is concluded that the principal structure internal force calculation results.(7)The results meet the requirements of the seismic design code of urban rail transit structure for seismic performance.