March 2, 2021 - 5:30pm to 6:30pm

110 North Wacker Drive

At 814 feet (248 meters), 110 North Wacker Drive is the tallest commercial office tower to rise in Chicago in more than 30 years. Built on a sliver of land bounded by Wacker Drive to the east and the Chicago River to the west, the 59-story tower was the product of strong architectural and engineering collaboration.

The team designed long-span, column-free perimeter office bays within the narrow site, leaving little available space for an interior structural core on the project site’s small, trapezoidal footprint. The composite concrete core and structural steel outrigger system efficiently minimizes the base width of the interior concrete core to just 29’9” at the narrowest section by engaging the perimeter building structure to resist lateral loads.

To maximize space for a new Riverwalk plaza, a system of dramatically sloped columns are clustered together and supported at three touchpoints along the river. These tall, slender supports are a distinctive architectural feature, engineered to gather the load from 54 floors overhead and precisely redirect it to the highest-capacity caissons used in Chicago.

Three Learning Objectives:

  • Unique foundation solutions for a small site filled with existing conditions
  • Designing a lateral load resisting system for an 814’ tall tower
  • The design of a signature base structure which gathers together the tower’s western edge loads into 3 points of support


This is a virtual event on Zoom. Please register before 10:00am on Monday, 3/1/21 to ensure you receive access to the presentation.

Members - $25
Non-Members - $50

1 CE Hour

Please note this event will NOT be recorded

About the Speaker

David Weihing, P.E., S.E., LEED AP
Thornton Tomasetti

As Senior Principal and Office Director in Thornton Tomasetti’s Chicago office, Dave Weihing is responsible for leading and overseeing the development of structural designs for local, national and projects worldwide. With over 20 years of experience, Dave has been integral in the design of many buildings throughout Chicago including 110 North Wacker, 191 North Wacker, Block 37 (108 N. State), Citadel Center, and Wrigley Field.



Shayne Manning ( THP Limited Inc. )
Lee Weihing ( Thornton Tomasetti )
Robert Sinn ( Thornton Tomasetti, Inc. )
Robert B. Johnson
Michael Weber ( Euclid Chemical Company )
Brian Boysen ( Burns & McDonnell )
Peter Busch ( HNTB )
Chelsea Wayman ( Woods Residential Engineering and Inspection )
Marcus Woods ( Woods Residential Engineering and Inspection )
Matthew Cummins ( DeSimone Consulting Engineers )
Steve Elver ( GEI Consultants, Inc. )
Nichole Mueller ( Mueller & Associates, LLC )
Justin Mickens ( Parsons Corporation )
Daniel Morton ( Burns & McDonnell )
Jennifer Pazdon ( Cast Connex )
Brittany Jamison
Isaac Gaetz ( The Vertex Companies, Inc. )
Clark Baurer ( Clark T. Baurer Structural Engineer )
Zachary Treece ( Thornton Tomasetti )
John Kissinger ( GRAEF (Milwaukee) )
Shanna Cowman ( David Mason + Associates )
Jared D'Amico ( K2N Crest )
Steven Megginson ( Hampton Lenzini & Renwick )
Kevin Henning ( JML Construction Inc. )
Nivin Jazrawi ( Simpson strongtie )
José Medero ( Thornton Tomasetti )
William Kolbuk ( Sargent & Lundy LLC )
Peter Babaian ( Simpson Gumpertz & Heger )
Rachel Jackson ( Thornton Tomasetti, Inc. )
Michael Wysockey ( Thatcher Foundations, Inc )
Jonathan Sladek ( WSP USA )
Benjamin Sexton ( Thornton Tomasetti )
Connor Mills ( Collins Engineers )
Matthew Hopper ( Cary Kopczynski & Company )
Hershel Bhat ( Klein and Hoffman )
Robert Lau ( Klein and Hoffman, Inc. )
Michelle Ryland ( Klein & Hoffman )
Jorge Medina ( Burns and McDonnell )
Nezar Abraham ( Thornton Tomasetti )
Nancy Radler ( SEAOI )
Stephanie Crain ( SEAOI )
Mary Jane Davis ( SEAOI )
David Weihing ( Thornton Tomasetti, Inc. )
Elaine Shapiro ( Thornton Tomasetti, Inc. )