JMEC was part of the EQE design team for the seismic vulnerability study of the Carquinez Bridge with main span of 1,100'. The West Span was of riveted steel construction, and the East Span was of welded steel construction.
JMEC was responsible for the review of seismic analysis results, and the preliminary retrofit design for the East Span. Preliminary retrofit measures and details were developed for the following:
Selective superstructure member strengthening by replacing bolts and adding cover plates
Strengthening of floor beam to truss connections
Strengthening of steel towers
Retrofit tower base connections
Strengthening of shear locks at expansion joints
Strengthening of suspended spans
Construct catch blocks and shear keys at abutment
Mobilize bridge deck by making bridge deck composite
Provide gaps at Expansion Joints
Project Role: Subconsultant for Bridge Design
Clients: California Department of Transportation
Special Issues: The west span (SB) was later replaced by a new suspension bridge and the east span (NB) was retrofitted.