The Lincoln Square South (LSS) Office Tower represents one of the largest, most innovative and iconic structural steel projects in the Pacific Northwest. The building features ultra-long span floor framing, a unique system of modulated beam/girder penetrations for integration of MEPF systems within the ceiling plenum, and 9’-6” ceilings in a 12’-9” floor to floor height which the well-coordinated MEPF/structural penetration layout helped create. The project also used high-strength ASTM A913 Grade 65 steel in the tower columns to reduce tonnage and fabrication cost, and high strength Steel Fibrous Reinforced Concrete (SFRC) in the concrete shear wall core coupling beams to eliminate reinforcing congestion and accelerate core construction.
In addition to the 450’ office tower, LSS includes a 450-foot hotel/residential tower, a three level retail podium, and six levels of subterranean parking. The 41-story hotel/residential tower features a 14-story W Hotel and upscale apartments. The 31-story structural steel office tower features Class ‘A’ office space with exceptional views of Mt. Rainier, Lake Washington, and Puget Sound. Both towers integrate with the steel framed podium which features retail shops, an upscale theater and a wide variety of restaurants.
LSS is an excellent example of how innovative structural design in high-rise buildings can successfully respond to demanding owner program requirements, enhance tenant flexibility, and dramatically reduce overall building cost.
This presentation will discuss engineering innovations behind the steel office tower design that helped accelerate construction, reduce cost, and maintain a column free floor layout. The target audience includes design professional and contractors, university faculty members, and code enforcement officials. One of the key goals of the presentation is to underline how innovative structural design can help projects meet schedule and budget targets, and help offset escalating building frame costs.