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.

Project Summary

Icon: completion-date

2018

Completion Date
Solutions
New Construction
Services
Structures
Markets
Commercial
Client(s)
Hydzik-Schade Associates, LTD.
Specialized Capabilities
Building Design

Key team members

Matthew Johnson
Matthew Johnson
Principal
312.754.7504 mhjohnson@sgh.com
View Bio
Connor Bruns
Senior Project Manager
781.370.9689 cjbruns@sgh.com

Additional Projects

Midwest

Hess Corporation Tioga Office Complex

Constructed in 2009, the Tioga Office Complex is the administrative hub for Hess Corporation’s Bakken Oil Field operations. After occupying the complex, Hess personnel observed water leakage in the office building. SGH investigated the cause of leakage and recommended options for repairs.
Explore
Midwest

Willis Tower Tenant Fitout

SGH served as the structural engineer for the Floor 41 renovation, which included evaluating the existing 1970s steel-framed structure, and designing structural modifications to accommodate programmatic changes and incorporate new stairs between Floors 41 and 43.
Explore
See All Projects