February 6, 2018 - 5:15pm to 7:30pm


Greenland Group Suzhou Center

The 358m tall Greenland Group Suzhou Center tower is currently under construction in Wujiang, China. The mixed-use building program consists of office floors in the lower levels and a hotel above. The lower level office floor plan is barrel-shaped, while the hotel floor plan consists of two curved single-loaded hotel bars facing north and south. Differences in the optimal architectural lease depth and core size for these two different programs are addressed by eroding the middle third of the core in the hotel portions of the building. This forms an atrium which extends clear through the building from east to west façade, giving the tower its signature ‘eye of the needle’ form.  While adding an important architectural element and providing dramatic views out to the east and west, the atrium in this configuration resulted in the core being split in two, greatly reducing its structural stiffness. To address this, the two isolated building cores in the upper hotel floors are laced together using structural steel bracing to form a composite ‘coupled core’. The behavior of this unique ‘coupled-core’ structural solution under lateral and torsional loads and the analysis and detailing of the composite lacing connections will be discussed. 

Attendees will earn 1.0 hour of Continuing Education Credit. CE certificates will be emailed after the event.

Please register by Friday, February 2 to guarantee your place.  Registrations received after that time will be honored if possible, but cannot be guaranteed.


About the Speakers: 

Mark Nagis, AIA, LEED AP is an Associate Director and Senior Designer with SOM, developing  design concepts in conjunction with the Design Partner. He is responsible for the project design and for the leadership of the project team. Mark implements and directs the design strategy of a project and is responsible for the project’s adherence to the design intent.  Other projects include the Hangzhou Greenland development, The Bank of Beijing Science and Technology Research and Development Center, and The Capital Cairo master plan. .



Ashpica Chhabra PE, SE, is an Associate with the Chicago office of SOM. With over 10 years of working experience, she has developed an expertise in the analysis and design of complex systems. Her past projects include the New San Bernardino Courthouse in California, the Chhatrapati Shivaji International Airport in Mumbai, and the Kula Belgrade Tower in Belgrade. Ashpica was the Project Engineer responsible for the design of the 358m tall Greenland Suzhou Tower.  



Cliff Dwellers Club

200 S. Michigan Ave, 22nd Floor

Chicago, IL


Cliff Dwellers Salad

Grilled Filet of Salmon



The registration fee is $45 for members, $65 for non-members. The evening begins with a cocktail hour at 5:15 pm. Dinner will be served at 6 pm, and the presentation will start shortly thereafter.  Please note that Cliff Dwellers' bar only accepts credit cards; cash is no longer accepted. 

Cancellation Policy:

If you make a reservation and cannot attend, please cancel by Friday, February 2.  If you do not cancel by that time, please send a colleague in your place, as you will be charged.



William Kolbuk ( Sargent & Lundy LLC )
Marsha Harman ( SEAOI - Structural Engineers Association of Illinois )
Mark Nagis ( Skidmore, Owings & Merrill LLP )
Jeff Ruhde ( Burns & McDonnell )
Pat McCarthy ( RETIRED )
Nishan Pethiyagoda ( Hilti, Inc. )
William Baker ( Skidmore, Owings & Merrill LLP )
Pinit Wichaimethawee ( Wolf Point Engineers & Contractors )
Jan Blok ( The Structural Group, Ltd. )
Robert B. Johnson
Ronald Boehm
Vladimir Kovacevic ( Anax Engineering, Inc. )
Kevin Conroy ( Simpson Gumpertz & Heger )
Eric White ( Goodfriend Magruder Structure LLC )
Bob Magruder ( Goodfriend Magruder Structure LLC )
Eduardo Prieto ( Goodfriend Magruder Structure LLC )
Lamyae Reklaoui ( Goodfriend Magruder Structure LLC )
Derek Boeldt ( Chicago Transit Authority )
Toby Mitchell ( Skidmore, Owings & Merrill LLP )
Saranthip Koh ( Skidmore, Owings & Merrill LLP )
Bradley Young ( Skidmore, Owings & Merrill LLP )
Aditya Kulkarni ( Skidmore, Owings & Merrill LLP )
Austin Devin ( Skidmore, Owings & Merrill LLP )
Max Cooper ( Skidmore, Owings & Merrill LLP )
David Horos ( Skidmore, Owings & Merrill LLP )
Kevin Chang ( Skidmore, Owings & Merrill LLP )
Christopher Brown ( Skidmore, Owings & Merrill LLP )
D. Stanton Korista ( Skidmore, Owings & Merrill LLP )
Dixey Arterburn ( Skidmore, Owings, & Merrill )
Matthew Parkolap ( Skidmore, Owings & Merrill LLP )
James Pawlikowski ( Skidmore, Owings & Merrill LLP )
David Nauheimer ( Sargent & Lundy LLC )
Cameron Puetz ( Sargent and Lundy )
Joel Smit ( IMEG Corp )
Matthew Hopper ( Cary Kopczynski & Company )
Ronald Johnson ( Johnson Engineering Systems )
Stephanie Hautzinger ( CannonDesign )
Jacob Effinger ( Epstein )
Nezar Abraham ( Brindley Engineering Corp. )
Jonathan Tavarez ( American Institute of Steel Construction )
Michelle Ryland ( Klein & Hoffman )
Wilson Smith ( ECS Midwest, LLC )
Rigi Chackanad ( Dywidag-Systems International )
Edmund Schloss ( ARUP )
Andrius Valinskas ( Epstein )
David Nickell ( TGRWA, LLC )
Karolis Kozys ( Furhmann Engineering )
Tom Harrison ( Holabird & Root, LLC )
Derek Skolnik ( Kinemetrics, Inc. )
David Petlicki ( SP Engineers Ltd. )
Ashpica Chhabra ( Skidmore, Owings & Merrill LLP )