Integral Forced Displacement Method for Seismic Design of Underground Structures

Abstract:

The internal forces of underground structures in an earthquake are controlled by the seismic deformation of surrounding soils. Based on the forced displacement method for seismic design of underground structures, a novel seismic design method, named the integral forced displacement method, was proposed. The ground response deformation was applied to the finite element model of integral soil in this method to simulate seismic loading. Taking a subway station in Shanghai as an example, the implementation procedure and special features were introduced. By comparing with dynamic time history analysis results，the validity and accuracy of the proposed method was verified. The results show that the design concept of integral forced displacement method well agrees with the earthquake damage mechanism of underground structures, and the method is suitable for seismic analysis and design of underground structures in practice.

Key words:underground structure; earthquake damage characteristic; integral forced displacement method; seismic analysis and design