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Seismic Upgrade of Berths 145–147 Container Wharf at the Port of Los Angeles
Existing Berths 145–147 at the Port of Los Angeles (POLA) were built in 1980's and were designed for smaller, older generation ships and 50-ft gauge cranes. The terminal needed operational upgrades to be able to accommodate the new ships with deeper draft and 100-ft gauge cranes. The upgrade of Berths 145–147 also constituted a seismic upgrade, which made them the first berths at POLA to be seismically upgraded. The upgraded structure was designed using the seismic hazard criteria for two earthquake levels the operating level earthquake (OLE), and the contingency level earthquake (CLE), defined in the POLA seismic code (Ref. 5). The wharf upgrade requires the removal and replacement of Berth 147 and a partial removal of the existing structure at Berths 145–146. The wharf upgrade design of Berths 145–146 requires additional piles to be driven on the landside to increase the lateral seismic capacity of the wharf. Also, a new concrete deck will be constructed to transfer load to these additional piles. The existing deck was used as falsework to reduced construction cost. Due to cost implications, the wharf upgrade design considered not removing the existing seismic piles as long it could be shown they have sufficient capacity to resist expected seismic demands. Therefore, a representative connection was built similar to the actual field condition and tested at the University of California at San Diego (UCSD) to assess the seismic capacity when subjected to reversed cyclic loading conditions. A full scale pile-to-deck connection test specimen was built and tested in upright position and supported by a hinged steel collar simulating at the point of contraflexure. The existing pile-to-deck connection reached displacement ductility greater than eight in both directions. This performance indicates that the existing pile elements and connections are able to can resist the expected demands and can be incorporated in the new wharf seismic upgrade. It is not necessary to cut the existing pile connection to the deck nor is it necessary to provide special reinforcement to the existing pile-deck connections. In addition, a dynamic soil-structure interaction analysis was performed using the finite difference computer program FLAC to evaluate and support the use of a king pile an underwater bulkhead system at the toe of the slope to accommodate the channel deepening to -53 ft.
Seismic Upgrade of Berths 145–147 Container Wharf at the Port of Los Angeles
Existing Berths 145–147 at the Port of Los Angeles (POLA) were built in 1980's and were designed for smaller, older generation ships and 50-ft gauge cranes. The terminal needed operational upgrades to be able to accommodate the new ships with deeper draft and 100-ft gauge cranes. The upgrade of Berths 145–147 also constituted a seismic upgrade, which made them the first berths at POLA to be seismically upgraded. The upgraded structure was designed using the seismic hazard criteria for two earthquake levels the operating level earthquake (OLE), and the contingency level earthquake (CLE), defined in the POLA seismic code (Ref. 5). The wharf upgrade requires the removal and replacement of Berth 147 and a partial removal of the existing structure at Berths 145–146. The wharf upgrade design of Berths 145–146 requires additional piles to be driven on the landside to increase the lateral seismic capacity of the wharf. Also, a new concrete deck will be constructed to transfer load to these additional piles. The existing deck was used as falsework to reduced construction cost. Due to cost implications, the wharf upgrade design considered not removing the existing seismic piles as long it could be shown they have sufficient capacity to resist expected seismic demands. Therefore, a representative connection was built similar to the actual field condition and tested at the University of California at San Diego (UCSD) to assess the seismic capacity when subjected to reversed cyclic loading conditions. A full scale pile-to-deck connection test specimen was built and tested in upright position and supported by a hinged steel collar simulating at the point of contraflexure. The existing pile-to-deck connection reached displacement ductility greater than eight in both directions. This performance indicates that the existing pile elements and connections are able to can resist the expected demands and can be incorporated in the new wharf seismic upgrade. It is not necessary to cut the existing pile connection to the deck nor is it necessary to provide special reinforcement to the existing pile-deck connections. In addition, a dynamic soil-structure interaction analysis was performed using the finite difference computer program FLAC to evaluate and support the use of a king pile an underwater bulkhead system at the toe of the slope to accommodate the channel deepening to -53 ft.
Seismic Upgrade of Berths 145–147 Container Wharf at the Port of Los Angeles
Aliviado, Ray (author) / Lim, Angel (author) / Jaradat, Omar A. (author) / Arulmoli, (Arul) K. (author)
Technical Council on Lifeline Earthquake Engineering Conference (TCLEE) 2009 ; 2009 ; Oakland, California, United States
TCLEE 2009 ; 1-7
2009-06-24
Conference paper
Electronic Resource
English
Seismic Upgrade of Berths 145-147 Container Wharf at the Port of Los Angeles
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Berths 145-147 Container Terminal Wharf Upgrade Design and Construction at the Port of Los Angeles
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