Field Testing of Bridge Design and Retrofit Concepts. Part 2 of 2. Experimentaland Analytical Studies of the Mt. Diablo Blvd. Bridge

摘要

Field testing and dynamic analysis of an elevated curved bridge arose out of thereconstruction and demolition activities at the Interstate 680/Route 24 interchange in Walnut Creek, California. Prior to its demolition, the bridge was subjected to forced vibration tests and ambient measurements. During the forced vibration tests, vibration generators placed on the deck of the bridge were used to excite the bridge in its principal directions. The resulting steady state response was recored and used to evaluated the dynamic properties of the entire bridge. For the ambient measurements, response to factors such as wind and local traffic were determined. After the beginning of the demolition sequence, ambient response of partial frames of the bridge were measured.