Centrifuge and Numerical Modelling of Shallow Underground Structures Adjacent To Tall Buildings

Abstract eng:
Shallow underground structures used for public transportation are a key component of sustainable cities. In dense urban environments, underground structures are often built near tall buildings. Although such buildings have the potential to alter ground motions in their vicinity and transmit significant forces to adjacent underground structures during earthquakes, these impacts are not well understood. Centrifuge testing and nonlinear numerical simulations are performed to evaluate seismic interactions between the soil, underground structure, and adjacent midrise or highrise buildings. The response of an 8 m high x 14 m wide embedded cut and cover tunnel structure is first studied without any adjacent buildings present, where numerical model estimates are compared and calibrated with the measured response. Two additional experiments are conducted with a mid-rise and a high-rise model building added near the underground structure to assess the change in the seismic response of the tunnel due to soil-structure-underground structure-interaction (SSUSI). Results indicate that the presence of an adjacent mid-rise building can be adequately modeled using three-dimensional numerical tools suggesting they are appropriate for use in seismic design for these complex interactions. The models show good agreement with experimental measurements in terms of displacements and accelerations on the buried structure. The dynamic lateral thrust acting on the underground structure is shown to roughly follow the adjacent building’s base shear in shape and amplitude.

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