Seismic Response Analysis of Typical Rectangular Sections of Underground Metro Stations
摘要
Underground structures are the indispensable part of the modern infrastructure with a broad scope of uses. Metro Stations or Subway Stations are large dimension underground structures. In general, underground structures have lower earthquake risk as compared to surface structures. However, dynamic behaviors of underground structures were observed during some past earthquakes and numerous significant damages were noticed in some underground structures amid past seismic tremors. Consequently, seismic analysis and seismic design ought not to be overlooked the design of these structures has to consider seismic loading. For underground structures, seismic loading is characterized in terms of deformations imposed by the soil on the structures and the interaction between them. The relative displacement between the base and ceiling levels due to subsoil movement created the destructive horizontal force in an underground metro station. At the point when the seismic impact results in this type of movement, it tends to be critical. The non-linear behavior of the subsoil profile may also be significant. This paper presents a two-dimensional (2-D) seismic analysis of a typical rectangular section of an underground metro station. The full dynamic time history analysis method is used for calculating the transverse seismic response of these underground sections. In time history analysis method, the soil and its boundary conditions should be reasonably modeled and processed. When calculating the transverse seismic response of underground station structures, the dynamic interaction model of soil structure can be used to analyze the problem of plane strain. Numerical calculation model included are analyzed by ANSYS; a finite element method (FEM) based computer analysis software.