Abstract
Strong earthquakes can cause damages to structural members and also yield non-negligible damages to nonstructural facilities, the latter being closely related to earthquake-induced inertial forces. At present, the acceleration response regularity of shallow-buried subway station structure is not very clear. Using the finite-element software ABAQUS, a dynamic soil-structure interaction model for a two-story subway station structure is established. The distribution of the peak acceleration response of the structure is obtained, and the damage assessment of non-structural facilities is carried out based on the structural acceleration response. The results demonstrate that, in general, the peak acceleration responses of the subway station structure increase from lower to upper story levels, while the peak acceleration responses at the same height are practically equal. Moreover, the peak accelerations of a shallow-buried subway station structure are generally less than or close to the peak ground acceleration. Furthermore, the nonstructural facilities are slightly damaged when subjected to a peak bedrock input acceleration of 0.1 g, and moderately damaged under a peak bedrock input acceleration in the range 0.2 – 0.6 g. Based on the acceleration response characteristics, it is proposed that the peak surface acceleration can be used as an index to evaluate the damage of non-structural facilities in shallow-buried subway station structure, which is simple, practical and basically meets the precision requirements.
Highlights
With the continuation of modern city development and underground space utilization, urban rail transit lines, which mainly consist of subways, have become an important means to resolve traffic problems
For the case of 0.6 g, the amplification factors of peak accelerations at the bottom plate, lower central column, middle plate, upper central column, top plate, and ground surface relative to bedrock are 0.66, 1.48, 0.77, 1.64, 0.88, and 0.88, respectively. These results suggest that, because the dynamic response of the subway station structure is controlled by the deformation of the surrounding soil, the overall distribution of peak interior acceleration responses of the subway station structure is similar to the pattern of acceleration propagation in soil, demonstrating the amplification effect under small earthquakes and the attenuation effects under large earthquakes
Using the finite-element software ABAQUS, a dynamic soil-structure interaction model has been established for a two-story subway station structure
Summary
With the continuation of modern city development and underground space utilization, urban rail transit lines, which mainly consist of subways, have become an important means to resolve traffic problems. The seismic analysis results for the subway structures in soft soil area show that: The earthquake action. For the structure of a subway station, the structural deformation incurred during an earthquake causes damage to the decorative materials (e.g., ceramic tiles, fireproofing coatings, and decorative panels) on side walls, making the inter-story drift angle a good index with which to describe the damage to interior wall decoration. Using the general-purpose finiteelement software ABAQUS (Dassault Systèmes, France), a two-story, two-span subway station is numerically modeled, and its dynamic time history considering soil-structure interaction is analyzed. The acceleration response characteristics of the subway station structure are summarized, based on which the damages to nonstructural members are evaluated
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