Aurora Multimodal and interurban Bridges Project
Shoreline, Washington, United States
With approximately 45,000 vehicles per day traveling through an area with
50,000 inhabitants, the Aurora Multimodal and Interurban Bridges Project
in Shoreline, Wash., improves pedestrian and vehicle safety for all modes of
travel within a three-mile corridor. The project includes intersection capacity
improvements, transit lanes, pedestrian bridges, and sidewalks.
The primary challenge was building community support for a new multimodal
corridor design for a one-mile portion of the urban arterial. CH2M HILL used
a context-sensitive solutions process to deliver a preferred alternative.
CH2M HILL deployed MicroStation for design work and InRoads for CAE road
design and surface modeling, which helped communicate the vision, garner
community support, and develop context-sensitive solutions.
ALSO NOMINATED IN SPECIAL CATEGORY: SUSTAINING OUR SOCIETY
David Evans and Associates, Inc.
Wind and Vibration Analysis for Pedestrian Bridge Over South Umpqua River – I- 5 O’Xing (Shady)
Douglas County, Oregon, United States
the proposed South umpqua river Bridge on interstate 5 in Oregon consists
of a pair of 290-meter cast-in-place, post-tensioned structures. A bridge
designed to carry pedestrians, bicycles, and maintenance vehicles will be
supported beneath the southbound structure. The project team considered
several cross sections and support systems for the bridge and settled on a
cable support system to construct a continuous-span, cast-in-place concrete
deck with edge beams suspended from the above bridge.
Using Bentley RM Bridge analysis software, David Evans and Associates
conducted computer modeling and calculations to address wind load,
buffeting effects, and vertical load-induced vibrations. By using this
technology, the project team avoided conducting expensive wind-tunnel
tests and allowed contract plans, specifications, and construction costs to be
developed in four months.