Retrofitting Northwest Connector for Seismic Forces

by Kevin Harper, California Dep of Transportation, Sacramento, United States,

Document Type: Proceeding Paper

Part of: Lifeline Earthquake Engineering


Many pre-1971 bridges in California have inadequate seismic resistance due to non-ductile components or poor connectivity of superstructure elements. Caltrans has finished the first retrofit phase, tying the superstructures together to prevent drop off failures. In the second phase, the entire structure is analyzed during the design seismic event and techniques are being developed to retrofit the substructure. Northwest Connector Overcrossing on State Highway Route 90, in Los Angeles, was the first phase 2 retrofit structure to be awarded for contract.

Subject Headings: Rehabilitation | Connections (structural) | Seismic tests | Seismic effects | Load and resistance factor design | Bridge components | Superstructures | Seismic design | California | United States | Los Angeles

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