Energy Response of Subway Station Structure Under Ground Motion

Considering the influence of soil-station structure on the 2D finite element analysis,the nonlinear dynamic interaction of soil-station structure is modeled,where a dynamic Davidenkov model is used to model dynamic characteristics of soils and a plastic-damage model is used to model dynamic characteristics of station structure concrete.The energy response of the station structure is analyzed under middle-far field ground motion and near-fault ground motion.Results show that damping energy and hysteretic energy monotone increase under ground motion,and the ground motion characteristics impact on the energy response of the station structure.The hysteretic energy of columns successively decreases from the bottom to the top,the hysteretic energy of sidewalls is mainly distributed in the bottom and the top.The distribution of hysteretic energy of beam slabs is relatively even,and the hysteretic energy of roof is relatively more.Furthermore,concentration effect of hysteretic energy of the structure is measured by hysteretic energy density.It is found that the hysteretic energy is the most centralized in the column.A seismic measurement of the columns must be promoted in the seismic design of subway station structure.