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Areas of Expertise - Transportation |
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West Seattle High-Level Bridge - Seattle, WA
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Bright Engineering Inc. is a Certified D/MBE in the states of Washington, Oregon and Texas. |
Bright Engineering assisted in developing the criteria, calculations and reports for load rating main spans of the complex bridge.
This high-level bridge is comprised of three spans (375'-590'-375') with two single-cell post-tensioned concrete box girders and cantilever segmental staged construction.
The method and sequence of construction were significant considerations in determining the live load carrying capacity of the bridge.
For transverse deck analysis, the plate theory method was used to determine moments and shears due to wheel loads.
The equivalent frame method was used to redistribute the moments and shears and to evaluate the critical sections of the transverse deck.
For longitudinal analysis, dead load effects were obtained by incremental placement of the concrete box segments to the frame model to simulate balanced, staged segmental construction.
Live load analyses were done on the completed and connected bridge model.
The effects of eccentric loading, elastic creep and shrinkage of concrete, and prestressing were considered in both transverse and longitudinal analyses.