GPLA and DPR have teamed up on the fully integrated design and construction of a 6-level, 64,000-sq.-ft., cast-in-place post-tension concrete parking garage, Southline Parking Structure D. Currently under construction for Lane Partners, the project is part of a new mixed-use, transit-oriented development that will add seven buildings of Class A office and life science space on a 27-acre site in South San Francisco, CA, just steps away from major transportation hubs.
The fast-track design-build project features a tailored engineering solution for the foundation system that returned cost and schedule savings to the owner. That system, designed by GPLA, incorporates a series of wide strip footings that are strategically placed in areas where they provide functional benefit, under walls and columns, in lieu of an earlier design by another engineer that had called for a more costly mat foundation system. The innovative and cost-saving approach helped earn the DPR and GPLA team the design-build contract, which includes substantial scopes of self-perform work. In addition to serving as structural engineer of record, GPLA is also performing rebar detailing on this job.
During design and construction, the team overcome several challenges including a highly constrained project site situated directly in the flight path of planes from nearby San Francisco International Airport, impacting the ability to utilize large cranes during construction. The team designed and erected a temporary barrier to protect workers from an active power line running along the side of the building, which had been delayed in being relocated underground by the local utility prior to start of construction.
The gravity structural system of the 960-stall parking structure features post-tensioned concrete slabs spanning between post-tensioned concrete beams, which span to reinforced concrete columns. The lateral system comprises special reinforced concrete shear walls in each orthogonal direction. The structure includes one elevator tower and two staircases. The project is slated for completion in late 2024.
