Chicago, IL
Tenant Fitout, 200 E. Randolph Street
Scope/Solutions
This insurance company relocated their headquarters to the Aon Center, a prominent building in Chicago’s skyline, and wanted to connect their space on the 32nd and 33rd floors with a feature stair. SGH analyzed the existing structure, designed the new stair, and detailed supplemental framing for the opening in the existing floor.
SGH designed the new architecturally exposed structural steel (AESS) switchback stair structure featuring laminated glass guardrails and handrails set into the plate stringers. Highlights of our work include the following:
- Evaluated the existing steel trusses at the 32nd and 33rd floors to support new stair loads
- Designed new framing around the slab opening in the 33rd floor to support the guardrails
- Developed details for the existing structure to provide construction flexibility
- Designed the new stair structure, including the stringers, treads, landing support, and connections to the base building
- Analyzed the effects from stair traffic vibration and acceleration on occupant comfort
We also evaluated the existing floor structure under loading from proposed intermediate and main distribution frame rooms.
Photo by JC Anderson
Photo by JC Anderson
Photo by JC Anderson
1 of 4
Project Summary
2018
Completion Date
Solutions
New Construction
Services
Structures
Markets
Commercial
Client(s)
Hydzik-Schade Associates, LTD.
Specialized Capabilities
Building Design
Key team members
Additional Projects
Midwest
Riverview Office Tower Parking Garage
Originally constructed in 1973, the Riverview Office Tower Parking Garage is a six-level precast, prestressed concrete parking structure with 1,600 parking spaces. SGH performed an assessment of the structure to help the owner understand its condition and plan for repairs.
Midwest
U.S. Cellular Headquarters
U.S. Cellular wanted to consolidate all Chicago-area operations, including their headquarters, into a single building where they already occupied eleven floors. SGH was the structural engineer for the renovation project, which added 120,000 sq ft to their existing space.