Evaluation of the seismic behavior of underground structures under different components of far and near-fault earthquakes

Eslami, Ehsan; Dashti, Hadi; Kazerounian, Alireza; Seraji, Mahmood

doi:10.22065/jsce.2024.450547.3381

Evaluation of the seismic behavior of underground structures under different components of far and near-fault earthquakes

Document Type : Original Article

Authors

Ehsan Eslami ¹

Hadi Dashti ²

Alireza Kazerounian ²

Mahmood Seraji ²

¹ Ph.D. Candidate. Department of Civil engineering, Bushehr branch, Islamic Azad University, Bushehr, Iran

² Assistant professor. Department of Civil Engineering, Bushehr Branch, Islamic Azad University, Bushehr, Iran

10.22065/jsce.2024.450547.3381

Abstract

Underground structures such as subways are important during earthquakes because they are built under densely populated and sensitive areas, such as commercial buildings. The failure of these structures can lead to significant loss of life and financial costs. In this paper, the seismic behavior of a subway station at different depths is investigated by modeling the geometrical and structural information in the Opensees software. The model is based on information from the Daikai subway station in Japan, which was seriously damaged in the Kobe earthquake of 1995. The model includes both soil and structure components. Validation results show that the software model is valid for investigating seismic effects of underground structures under near and far-fault earthquakes in both horizontal and vertical components. The study examines the effects of changes in depth and field records of near and far-fault parameters on axial force, shear effects, acceleration, and relative displacement on the structure using time history analysis. The results indicate that increasing depth leads to a decrease in relative displacement of the middle column in far and near–fault earthquake, while also increasing axial force in the middle column in both far and near–fault and it shows that investigating the effect of the vertical component is very important for calculating the axial force of underground structures. Investigation of the displacement contour at the lowest depth under the horizontal component in the far-fault shows that the largest amount of displacement belongs to the upper slab of the structure.

Keywords

Underground structure

Far and near-fault earthquakes

Depth effects

horizontal and vertical components

Seismic response

Subjects

Soil-Structure Interaction

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