Williams Mullen Center
Receiving recognition for our engineering excellence on the Williams Mullen Center project was quite an honor. Speigjt Marshall Francis was awarded a 2011 Engineering Excellence Honor Award from the Virginia Chapter of the American Council of Consulting Engineers (ACEC). Also in 2011 Greater Richmond Association for Commercial Real Estate honored the project with “Project of the Year” and “Best Office Project.”
Speight Marshall Francis served as the Structural Engineer of Record and Agent 1 Special Inspector for this 17-story William Mullen Tower in downtown Richmond. The building is comprised of first floor retail space, 5-story parking garage topped with 10-stories of Class A office space. The footprint of the new tower encompasses the entire surface parking lot on the corner of 10th and Canal Streets. Our building also extends 50-feet over the footprint of the Richmond Metropolitan Authority (RMA) parking garage at the sixth level. This unique footprint presented several issues and opportunities to develop creative solutions during the design and construction phases. The building construction consists of a reinforced concrete frames and post-tensioned concrete flat plate floor system. The existing parking structure was analyzed for the effects of the new building and it was determined that 8 seismic column base isolators would be used to minimize the lateral loads on the existing building. The building is founded on 3-foot, 4-foot and 5-foot diameter caisson drilled 60 feet into the riverbed below. Caisson installation was extremely critical as the caissons were installed in the same location as the foundation tieback system for the existing garage. SM&F was required to be on-site for continual observation of the caisson installation to insure the tieback system for the existing garage was maintained and to react quickly to remediate any damaged tieback.
Images courtesy of Armada Hoffler.