GPI provided structural engineering design services for the renovation and vertical expansion of an existing five-story plus basement office building into a luxury boutique hotel in Dupont Circle. The existing structure consisted of a 1950s cast-in-place concrete building with a 1980s addition.
The vertical expansion added two new composite steel-framed levels and a penthouse supported by new steel columns bearing on the existing concrete columns below. To accommodate the additional building height and mass, GPI designed new concrete shear walls and mat foundations. The project required installation of micro piles to temporarily support existing column footings during excavation and construction of new elevator pits and foundations. Existing concrete stair towers were demolished and replaced with new steel-framed stairs, and an existing bank vault with heavily reinforced concrete walls and slabs was partially demolished to accommodate new elevators. Several columns received carbon fiber reinforced polymer wrapping for structural strengthening. The scope also included infilling numerous existing slab openings, creating new ones, and reinforcing the existing structure to support new strip windows and the masonry and granite veneer along the Connecticut Avenue façade.
Project Highlights
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Owner/ClientBBGM Architects
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LocationWashington, DC
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ServicesExisting Building Reinforcement
Façade Structural Support
Foundation and Shear Wall Design
Structural Engineering
Structural Renovation Design
Vertical Building Expansion
