A rather unique stacking of voided concrete advantages.
PROJECT VOIDED SLAB ACHIEVEMENTS:
Provided long-span flexibility
Provided essential deflection control
Helped project attain LEED Gold Certification
Roger H. Corbetta Award, Concrete Industry Board (CIB)
Weight reduction: 638 tons
The Columbia University Medical Center is a state-of-the-art medical education building that reflects how medicine is taught, learned, and practiced in the 21st century.
Designed by Diller Scofidio + Renfro in collaboration with Gensler as the executive architect, and Leslie E. Robertson & Associates (LERA) as structural engineer, this 14-story glass tower interweaves technologically advanced classrooms, collaboration spaces, and a modern simulation center. The building’s structural spine is a site-formed reinforced concrete vertical core, which provides shear capacity. In the cascade, there are reinforced architectural concrete columns with embedded steel-up girders. Post-tensioned, reinforced concrete slabs with embedded structural steel and concrete void formers enable the long spans and cantilevers of the south facade.
The voided slab solution features the use of stacked voids, along with post-tensioning, within slab thicknesses ranging from 11” to 25” to accommodate a variety of span and loading conditions.
The building was awarded LEED Gold for sustainable construction. Environmental technology such as fixed and operable shading optimizes the regulation of daylight and sunlight and an innovative mechanical system that maximizes comfort, while at the same time reducing the energy and water consumption in the building.
Green roof technologies reduce the heat-generating effects of urban asphalt and concrete, decrease building energy consumption, and recycle stormwater runoff. Native plantings adapted to the area’s sun and wind conditions minimize irrigation requirements and produce year-round texture, color, and shelter. LEED, or Leadership in Energy and Environmental Design, certification is a globally recognized symbol of sustainability achievement.
Diller Scofidio + Renfro
Leslie E. Robertson & Associates (LERA)
In the June 2019 issue of Civil and Structural Engineer, author Kristin Depenzia highlights the benefits of post-tensioning in structures, with this project as a prime example. It’s worth noting that post-tensioning on this project worked hand-in-hand with a voided slab system, (pictured here) provided by CobiaxUSA, creating even greater efficiencies as a result.