Seismic soil-structure interaction analysis for immersed tube tunnels retrofit

Youssef M A Hashash, Wen S. Tseng, Alexander Krimotat

Research output: Contribution to journalArticle

Abstract

Two immersed tube tunnels used for vehicular traffic in the seismically active San Francisco Bay Area were built over 30 years ago with little consideration to seismic effects. A seismic retrofit study was conducted to assess the vulnerability of the tubes to seismic shaking and to develop necessary retrofit schemes. Three-dimensional soil-structure interaction models of the tunnels and portal buildings were developed to simulate the structures response to earthquake induced ground motions. The analyses showed that the existing continuous joints that connect the tube segments would result in the transmittal of significant axial forces and moments, which can cause cracking in the tubes, and damage to the portal buildings. A retrofit design was developed where the immersed tube segment joints were released in tension and gaps were provided at the tube-portal building joints. Analyses of the proposed retrofit scheme showed a reduction of forces and displacements to acceptable levels.

Original languageEnglish (US)
Pages (from-to)1380-1391
Number of pages12
JournalGeotechnical Special Publication
Issue number75 II
StatePublished - 1998

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Soil structure interactions
soil-structure interaction
soil structure
Tunnels
tunnel
seismic retrofit
cracking
earthquakes
traffic
ground motion
Earthquakes
vulnerability
earthquake
damage
analysis

ASJC Scopus subject areas

  • Building and Construction
  • Architecture
  • Soil Science

Cite this

Seismic soil-structure interaction analysis for immersed tube tunnels retrofit. / Hashash, Youssef M A; Tseng, Wen S.; Krimotat, Alexander.

In: Geotechnical Special Publication, No. 75 II, 1998, p. 1380-1391.

Research output: Contribution to journalArticle

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