Abstract
During 1995 Kobe earthquake, the metro stations suffered serious damage. The Daikai station was the first well-documented underground structure not crossing an active fault that has completely collapsed during an earthquake without liquefaction of the surrounding soil. Most columns of the Daikai metro station collapsed, including mid-column shear failure, which had never been observed in the past. In order to increase aseismic capability of metro stations, an analytical model of an elastically supported and damply supported beam (or column) subjected to combined action of seismic loading with static axial loading was developed. Based on the secondary Lagrange’s dynamic equations, an analytical method was established, which could be used to investigate the dynamic response of the beam. The effect of the axial loading on the dynamic responses of the member, the influences of the stiffness and damping coefficient were analyzed. In order to further investigate into the nonlinear response of an elastically supported and damply supported column, taking the Daikai metro station as an example, the 3D nonlinear responses of the column of the subway station with isolator supports subjected to the seismic loading in Kobe earthquake were analyzed by finite element software programme ABAQUS. The main conclusions can be drawn as follows: (1) The proposed analytical model of an elastically supported and damply supported beam (or column) can predict the dynamic response of the structural member subjected to action of combined seismic loading with static axial loading. (2) Setting isolators (springs and dampers) at the supports could reduce the deformation and damage of the column effectively, and hence the seismic-resistance of the structure could be also enhanced. (3) The axial static loading induced by the gravity of soil and structures provide the constraint on the column. But when the plastic hinge occurred at the joint between walls and slabs, the axial loading would accelerate the damage of the whole structure. Therefore, it could not be neglected in the structural dynamic analysis.
Key words
seismic loading /
subway station /
isolation effect /
theoretical analysis /
3D nonlinear dynamic analysis
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Huan Yi;Fang Qin;Liu Jin-chun;Chen Li;Du Mao-lin.
Theoretical and numerical investigations into enhancement of aseismic capability of metro stations[J]. Journal of Vibration and Shock, 2011, 30(3): 252-257
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