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I-90 Lacey V. Murrow, East & West Transition Arch Spans - WSDOT, Seattle, WA
Parametrix Bridge and Structures staff were responsible for the widening and seismic retrofit design, including an in-depth inspection, of two tied arch structures, including erection sequencing and construction techniques. Prior to the final PS&E, a complete in-depth inspection of the structures was performed to evaluate their load ratings and recommended retrofit measures. The design also included replacement of all the original bearings with a base isolation system.
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SR 9/SR 522 to Clearview - Snohomish County, WA
Parametrix staff performed the design and load rating of a replacement structure over SR 522 in Woodinville. The new 367-foot-long, four-span, prestressed concrete girder bridge was designed for four lanes of traffic. Specifically oriented spread footings were used to maintain the integrity of the existing structure. The project included construction sequencing and schedule, construction cost estimates, and special provisions. Detailed stage construction and shoring requirement drawings were prepared to allow for the continuous flow of traffic during construction.
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Elevated Light Rail System Rehabilitation - Jacksonville Transportation Authority, Jacksonville, FL
Parametrix staff were responsible for the rehabilitation/restoration of the cracking superstructure elements of an existing elevated light rail system. During preliminary investigations, it was determined that the cracking was caused by internal stresses created from the debonding of an excessive amount of strands. Numerous alternative methods of retrofit were investigated. For the final design, the beams were wrapped with CFRP (carbon fiber reinforced polymer). This solution was the most cost-effective and the least obtrusive visually.
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Tacoma Narrows Bridge Investigation - WSDOT, Tacoma, WA
Parametrix staff were responsible for the Tacoma Narrows suspension bridge structural investigation for WSDOT. Nondestructive testing methods and in situ testing were used along with a three-dimensional nonlinear analysis of the structure to determine stresses in the stiffening truss and towers. Field measurements were also taken to determine the existing suspender cable tensions. The existing cable tensions were then incorporated into the computer model to accurately understand the behavior of the existing structure. Upon completion of the structural investigation, a seismic vulnerability study was performed on the structure utilizing the same basic modeling techniques used for the first phase.
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University Bridge Bascule Span - City of Seattle, WA
Parametrix Bridge and Structures staff performed the retrofit design, including an in-depth inspection, of the main steel bascule span of the University Bridge, a lifeline structure carrying traffic over the Lake Washington Ship Canal. The design included performing a three-dimensional multi-mode seismic analysis on the steel bascule structure and the supporting concrete and masonry piers. The final retrofit designs, contract plans, and construction specifications were developed as part of the PS&E submission package to the City of Seattle.
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Ford Island Floating Bridge - Honolulu, HI
Parametrix Bridge and Structures staff performed element design, fabrication, erection, and construction of three floating prestressed concrete sections. Once combined, the overall length of the structure was 900 feet, making it the longest retractable floating structure in North America.
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"G" Street Overcrossing, Tacoma Rail (Sound Transit) - City of Tacoma, WA
Parametrix staff performed in-depth inspection and a complete PS&E package to retrofit this BNSF single-span plate girder structure with an overall length of approximately 120 feet. The original structure was built around 1920 and consisted of four built-up riveted girders supporting precast concrete track bed sections. The retrofitting/rehabilitation design incorporated Cooper E-70 loading and included rebuilding the existing plate girders, repairing areas of extensive damage, replacement of the concrete track panels, waterproofing details, ballast and rail replacement, and miscellaneous enhancements.
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Gravina Access Project - Alaska Department of Transportation & Public Facilities, Ketchikan, AK
Parametrix Bridge and Structures staff were responsible for the evaluation of practicable alternatives of a crossing from Ketchikan to Gravina Island across Tongass Narrows in southeast Alaska. Site conditions required the alternatives to consider vessel clearances, airport clearance envelopes, deep foundations, and float plane restrictions. Alternatives considered for the 850-foot main spans included cable-stayed, tied arch, segmental box, and movable bridges.
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Glenn/Parks Interchange Highway - Alaska Department of Transportation & Public Facilities, AK
Parametrix staff were responsible for the preparation of environmental permit drawings, bid documents, and preliminary bridge design for the new interchange between the Glenn and Parks Highways. The alignments and structures were modified to limit their impact to sensitive wetlands in the area. Our staff also monitored the progress of the design-builder throughout the project.
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