NOTE: The following event is presented by The American Society of Civil Engineers Golden Gate Branch. For more information on the event, contact ASCE GGB at goldengate@asce-sf.org
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NEW CRYSTAL SPRINGS DAM BRIDGE
SUPPORTED ON DAM CREST ON SEISMIC ISOLATORS
Our Speaker will be Roupen Donikian, Sr. Engineering Manager with WSP (formerly Parsons Brinkerhoff), designers of the new bridge built on top of Lower Crystal Springs Dam, 7 feet higher than the old bridge above the dam to clear the parapet walls that had been raised by 7 feet. The bridge is a 630 feet long, 7-span post-tensioned concrete structure supported on isolation bearings for earthquake resistance. The San Andreas fault is only about a quarter mile away. The isolation system involves lead-rubber bearings and special seismic joints at the roadway approaches and pedestrian access to accommodate large displacements. This is a unique bridge and Roupen presented its seismic design at the 7th National Seismic Conference in 2013. The bridge is complete, and the facility is expected to open soon.
