The Design and Construction Aspects of the Structure Research Tests at Cypress Viaduct

by Robert M. Jones, CALTRANS, Sacramento, United States,
Irving A. Schroeder, CALTRANS, Sacramento, United States,

Document Type: Proceeding Paper

Part of: Lifeline Earthquake Engineering


A research program is described whose task was to gather information about the inherent strengths and weaknesses of the existing Cypress bridge structure and to evaluate the effectiveness of the various structural components within the proposed retrofit plans for other double deck bridge viaducts in the San Francisco area. The testing was done on a relatively undamaged two span section approximately 170' long. The tests included forced vibrations and lateral jacking to recreate a failure in the upper column pedestal. The tests showed that a minimal amount of steel retrofit could prevent collapse and sustain the vertical load carrying capacity.

Subject Headings: Construction management | Viaducts | Load tests | Vertical loads | Load bearing capacity | Concrete bridges | Reinforced concrete | Load and resistance factor design | California | United States

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