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“We were tasked to keep historic spaces as they were on opening day in the 1930s.” The excavation also necessitated a new stormwater management system that includes 75,000 gallons of storage capacity in cisterns located beneath an adjacent field. So Skanska decided it would have to dig out more than 6,000 cu yd of rock using chipping hammers and grinding wheels. “But that data led us to believe it was much deeper,” she says.īlasting was out of the question given the proximity of UVA’s landmark buildings. The rock wasn’t totally unexpected, Meyer says, citing as-builts and geotechnical reports from the 1960s infill construction. As the start neared for the up to 26-ft-deep excavation for the new addition’s foundation system, the team discovered that a massive layer of hard bluestone rock lay in their path. Photo courtesy Skanska USA Uncovering obstaclesĭespite the project team’s many hours of advance research and planning, the Alderman Library didn’t give up all of its secrets. The project team performed demolition work concurrent with construction. “It was braced and supported until it could be incorporated into the addition.”
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“We decided it would be more efficient from appearance and structural standpoints to keep the wall in place versus demolish and rebuild,” Kinane explains. Left in place was a single full-height 16-in.-thick interior wall to border two new interior study courtyards. The process removed more than 23,000 tons of material, 75% of which was recycled. “At the same time, we’re also installing shoring and bracing for the original building, and keeping the dirt from sliding back in,” adds Chris Rhodes, Skanska senior project manager.Īs the shear wall began to rise and interior work got underway, Skanska-led crews meticulously demolished the infill structure. After clearing away a narrow work area and demolishing concrete masonry unit walls, crews installed the shear wall’s grade beams, mats and anchors. To access foundations in the sub-basement level-nicknamed the Dirt Room because it was mostly occupied by the original hillside slope-Skanska crews had to lower personnel and equipment, including a mini-excavator, through a 20-ft by 120-ft hole cut into the second-floor slab. Installing the shear wall proved to be an adventure.
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He credits structural engineering consultant Silman for balancing those disparate needs with a strategy that included adding a 125-ft-wide, reinforced concrete shear wall, drag struts to transfer lateral loads via the floor slabs and clips to tie the masonry infill to the building’s steel structural frame. Kinane says, “Making sure we could accommodate that structurally without impacting the original architecture was the biggest challenge.”Īlong with additional shelves for library volumes, the addition will contain a café, new ground-level entrances, offices, support space and a double-height reading room on the fourth floor.
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“We were tasked to keep historic spaces as they were on opening day in the 1930s,” explains Bill Kinane, a principal with HBRA Architects of Chicago, which teamed with Clark Nexen of Virginia Beach, Va., to lead the design work.
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One of those considerations was the need to implement a full-scale seismic upgrade for the original building constructed of 18-in.-thick concrete-encased steel beams with load-bearing masonry infill while also preserving its distinct architectural integrity. Convincing university officials to empty the library of its 1.5 million books for four years of construction wasn’t easy, Meyer says, but adds, “We had to approach this as a single project.” “Skanska came back and told us that really wasn’t economically or logistically feasible,” she says. At the outset, Meyer explains, the renovation plan called for keeping the library open while the project unfolded in phases. What’s more, the work is located on a busy Charlottesville corner just a stone’s throw from the university’s 19th Century Rotunda and Academical Village that UNESCO has designated a World Heritage Site. That contractor might also be impressed with the multiple challenges the team has faced in what UVA senior project manager Kit Meyer calls “a tender renovation” that will take place at the same time as demolition and new construction. Rendering by HBRA Architects, courtesy Skanska The library is located on a busy corner just a stone’s throw from 19th-century landmarks designated as a UNESCO World Heritage Site. “That general contractor would be amazed.” “It’s definitely a paradigm shift,” Calvin says with a laugh.