Assessment of seismic risk of large underground structures

作者：Huan Yi^*; Fang Qin; Chen Li; Zhang Ya Dong; Liu Jin Chun

来源：Journal of PLA University of Science and Technology(Natural Science Edition), 2010, 11(4): 445-450.

• Basic functions
• Complex condition
• Dakai subway station
• Elasto-plastic
• Foundation soils
• Large deformations
• Risk assessment methods
• Risk matrix
• Seismic risk
• Seismic risk assessment
• Time history analysis

When strong shock happens, the foundation soil may undergo large deformation and be followed by the failure of weak parts of the structure. To evaluate the seismic risk of underground structure, a risk assessment method was proposed combining elasto-plastic time history analysis with risk matrix. The implementation procedure, the basic functions and the special features of the method were introduced in detail. The elasto-plastic time history analysis could describe the failure modes of the underground structures by considering different complex conditions. According to the damage of the structure, the seismic risk matrix was established and the seriousness of seismic risk was obtained. Taking Dakai subway station as an example, the dynamic responses under three earthquakes of different grades were simulated by elasto-plastic time history analysis, and the risk assessment of the structure was analyzed by the risk matrix method. The result shows that the method combining elasto-plastic time history analysis with risk matrix is useful and suitable for seismic risk assessment of large underground structures.

• 出版日期2010