499 Illinois Street

Highlights of SGH’s work for this project include the following:

• Developed an innovative foundation system incorporating steel H-piles set in an auger-cast secant wall that integrates grouts of two different strength and functions as a shoring wall, a permanent foundation wall, a below-grade groundwater cutoff wall, and a waterproofing barrier
• Incorporated a seismic force resisting system with buckling-restrained braces and composite concrete-encased steel columns designed using nonlinear response-history analysis
• Designed floors to limit walking-induced vibration to 2,000 micro-inches per second
• Designed a mat foundation that was placed in a continuous fourteen hour effort that involved an 11,000 cu yd, monolithic placement of concrete to minimize potential for water intrusion and reduce construction cost
• Designed and observed waterproofing installation below-grade, raised plaza, balconies and roofs
• Provided performance criteria and third-party commissioning for design-build curtain walls