The Study Of Seismic Response And Destruction About Cross Subway Station Ground Structure

Twenty first century is a construction and development age of underground space,including the construction of subway engineering.Nowadays,first and second tier cities in our country are constructing subways in order to reduce the pressure on urban traffic.Great attentions should be paid to the structural design and construction of the subway station for the station is a crowded public place,We also have to focus on the security of the station.Only in this way can we reduce the damage to the subway station caused by natural disasters and lesson the economy loss.At present,the lack of earthquake disaster prevention experience in construction of underground structure in our country calls for further research on and underground structure seismic design.A soil and structure model for the cross of Shenyang subway station is established by ABAQUS the finite element software,in order to analyze its response under seismic action.The study results are as follows:(1)We determined the scope of the foundation soil around the subway station before analyzing the model of soil established by the finite element software.We choose three times,five times and eight times respectively in the width of the station structure of foundation to calculate.The calculation results show that the seismic displacement of three times foundation soil widths of the station structure is close to that of five times and eight times.Thus,the three times the width of the station structure foundation soil is chosen as the soil and station structure finite element model.(2)We establish characteristic models for cross subway section and other two lines respectively to analyze,aiming to find the static mechanical characteristics of three different cross sections.Finally,the calculation results show that when the structure of subway station is forced by stress,the node and across of structure will have a larger internal force value,which indicates results have been show that the week points of station structure.Finding the week points of station structure can contribute to earthquake-resistance.(3)The analysis of three cross station sections shows that they have similar characteristics.Therefore,we establish finite element model for cross section of the station to research the earthquake damage on the station.We apply horizontal and vertical of seismic wave,Qian an(E-W)and Qian an(V),to act on structure.The calculation result shows that seismic displacement decrease gradually from the top floor to bottom,the stress gradually decrease from both sides to the middle.The nodes between wall and slab and between the wall and the column have a larger stress value.The stress value of node structure is greater than that of the middle.The simulation calculation in two directions of the seismic action show that when the seismic displacement of subway station caused by vertical earthquake is 0.67 times of that caused by horizontal earthquake in Shenyang area.