T.Y. Lin International (TYLI) evaluated the seismic adequacy of the Vanowen Street Bridge over the Los Angeles River for the City of Los Angeles. Based on the analysis and seismic requirements, TYLI prepared plans, specifications, and estimates (PS&E) for the replacement of the bridge superstructure.
The existing structure was a 280-feet-long, three-span, steel plate-girder bridge supported by tall pier walls with a 40-degree skew. The replacement superstructure consists of precast, prestressed concrete girders with a cast-in-place concrete deck. To match the approaches, the new superstructure is approximately 11 feet wider than the previous structure, requiring widening of the abutments and pier walls.
- Stringent seismic requirements were due to proximity to 7.5 magnitude Simi-Santa Rosa and Northridge Hills faults.
- TYLI's retrofit strategy determined superstructure replacement and widening both sides of bridge as the most cost-effective solution.
- A bike path was designed as part of a continuous bikeway along the river.
- A new retaining wall preserves the slope above the bike path as it drops into the river channel and under the bridge.