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Scenic-Bridge Strengthening (Available in Structural Engineering Special Issue only)

by Brad Pollock, P.E., Design Engr.; Buckland & Taylor Ltd., Walnut Creek, CA,
J. M. Benoit, P.E., Chf. Engr.; Buckland & Taylor Ltd., Walnut Creek, CA,
Dave Pajouhesh, P.E., Sr. Bridge Engr. and Proj. Mgr.; California Dept. of Transp.,


Serial Information: Civil Engineering—ASCE, 2000, Vol. 70, Issue 4, Pg. A8-A10


Document Type: Feature article

Abstract:

Built in 1937, California's Big Creek Bridge�a double-arch crossing with half-arch side spans�was due for a seismic retrofit. Challenged by the structure's unique support system, which doesn't rely on abutment foundations, and its fractured rock base, engineers devised a foundation retrofit that provided the necessary strength and stiffness via modified tie-down anchors that pass through the alluvium and into the fractured rock. Irregular rock bands located at depths beyond the reach of equipment required the use of vertical tie-downs at one pier, which would hit the rock at higher elevations. The retrofitting was completed in late 1999.

Subject Headings: Rocks | Structural strength | Rehabilitation | Foundations | Cracking | Support structures | Structural systems

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