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A platform for research: civil engineering, architecture and urbanism
Performance of the Wet Soil Mixing-Supported West Dowling Bridge during the 30 November 2018 Anchorage Earthquake
The performance of improved ground during earthquakes continues to receive high interest in the geotechnical earthquake engineering profession given the need to establish best design and construction practices associated with ground improvement technology. The M7.1 30 November 2018 Anchorage earthquake produced significant shaking intensity at the West Dowling Street Bridge as recorded at a nearby ground motion station. The paper describes the site and subsurface conditions at the bridge, the static and seismic design objectives, and the deep soil mixing ground improvement used to satisfy performance criteria. Then, an overview of the 30 November 2018 earthquake is described, followed by an exploration of the ground motion characteristics measured 0.6 km from the bridge. Observations on the bridge condition conducted following the earthquake by members of the Alaska Department of Transportation and GEER association are described within the context of the measured ground motions. The paper concludes with Newmark-type seismic stability analyses conducted using the nearby ground motions to compare anticipated displacements with those observed following the earthquake. This case history provides a successful example of a shallow foundation-supported bridge abutment overlying deep soil mixing-improved ground and subjected to intense, directional ground motions.
Performance of the Wet Soil Mixing-Supported West Dowling Bridge during the 30 November 2018 Anchorage Earthquake
The performance of improved ground during earthquakes continues to receive high interest in the geotechnical earthquake engineering profession given the need to establish best design and construction practices associated with ground improvement technology. The M7.1 30 November 2018 Anchorage earthquake produced significant shaking intensity at the West Dowling Street Bridge as recorded at a nearby ground motion station. The paper describes the site and subsurface conditions at the bridge, the static and seismic design objectives, and the deep soil mixing ground improvement used to satisfy performance criteria. Then, an overview of the 30 November 2018 earthquake is described, followed by an exploration of the ground motion characteristics measured 0.6 km from the bridge. Observations on the bridge condition conducted following the earthquake by members of the Alaska Department of Transportation and GEER association are described within the context of the measured ground motions. The paper concludes with Newmark-type seismic stability analyses conducted using the nearby ground motions to compare anticipated displacements with those observed following the earthquake. This case history provides a successful example of a shallow foundation-supported bridge abutment overlying deep soil mixing-improved ground and subjected to intense, directional ground motions.
Performance of the Wet Soil Mixing-Supported West Dowling Bridge during the 30 November 2018 Anchorage Earthquake
Stuedlein, Armin W. (author) / Gibson, Matthew D. (author) / Yamasaki, Kenji (author) / Hemstreet, David (author) / Shao, Lisheng (author)
International Foundations Congress and Equipment Expo 2021 ; 2021 ; Dallas, Texas
IFCEE 2021 ; 414-429
2021-05-06
Conference paper
Electronic Resource
English
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