BART Seismic Retrofit

WHAT HAVE BEEN ACCOMPLISHED:

JMEC has been lead structural engineer for the seismic analysis and retrofit design of aerial guideway structures for the 'A'-Line North segment. The entire alignment is about 9 miles consisting of more than 600 piers and including 104 piers that qualify for Caltrans LSSRP funding. Innovative design and VE Engineering have been implemented so that the structure retrofit and all associated civil work are within project cost. The following work was completed:

Data collection and site visits to confirm as-built information and identify possible impacts to traffic, BART operation and safety, City's facilities, UPRR, utilities, environment and R/W.
Performed seismic evaluation of BART aerial structures to determine seismic vulnerabilities and the required seismic retrofit to meet performance goals as set forth in the BART Seismic Design Criteria under the DBE (Design Basis Earthquake) and LDBE (Lower Design Basis Earthquake) levels of earthquake. Consideration was given to allow foundation rocking and retrofit measures that are required for cap beams, columns, shear keys, hinge/seat, and joint shear/capacity as outlined in the design criteria.
Worked with civil design team and other agencies including BART and Caltrans to develop retrofit strategies.
Prepared retrofit strategy reports summarizing the analysis results, proposed retrofit measures and associated costs. Attended strategy meetings with BART and Caltrans.
Prepared construction documents in the Final Engineering Phase.
Provided construction phase services and redesigned several foundations to eliminate the needs for expensive deep shoring.