The design followed security requirements established by a team of experts that defined the threats for this site. One formidable challenge was the need to meet or exceed codes and standards not yet written at the design stage.
“One World Trade Center will be unprecedented in terms of life safety and security, and will set a new safety standard for the design of tall buildings,” Rahimian said. The structure consists of a high-strength concrete core paired with a perimeter steel frame that provides tenants with a flexible, spacious, column-free interior. “The core acts as the main spine of the tower, providing support for gravitational loads and resistance to wind and seismic forces.”
Every design solution was meticulously reviewed and supported by a multitude of rigorous analyses and design procedures, added Eilon.
“The design and construction of One World Trade Center is the result of a relentless collaborative effort between numerous design and construction teams over a period of several years, with a resolute focus on the goal of creating an iconic tower affirming the preeminence of New York City,” Eilon said.
A series of wind tunnel tests were performed to ascertain an accurate measurement of the tower’s response to hurricane-strength winds. “The wind acceleration results at the highest occupied level of the building meets the criteria of human comfort for office buildings,” Rahimian said.
Although 1WTC is the most recognized tower, it is just one of the buildings that have been built or are currently under construction at the World Trade Center site. WSP is involved with the engineering of four of those buildings:
- Two World Trade Center, with a diamond-shaped top reaching 1,350 feet in height, will be the second-tallest building in New York when completed.
- Three World Trade Center is 1,175 feet tall. The 80-story building is scheduled to be completed in 2017.
- Seven World Trade Center, the first building completed in the WTC complex in 2006, included numerous life-safety and environmental features never before incorporated into a commercial skyscraper.
- The National September 11 Memorial and Museum, which includes a landscaped plaza containing the memorial, two waterfalls and reflecting pools that occupy the footprints of each of the original twin towers, and the 110,000-square-foot museum.
WSP continues to serve as the engineer of record for fit-out and tenant work at 1WTC.