Council on Tall Buildings and Urban Habitat
 Building Movement and Damping Workshop,
Shanghai 2014
September 16, 2014

SHANGHAI - The Building Movement and Damping Technical Workshop reviewed some of the latest strategies and concepts for helping tall buildings avoid discomforting or destructive movement in seismic and wind events.

Session Chair:
Constantin Christopoulos, Chief Technical Officer, Kinetica

Presentation Speakers:
Michael Montgomery, Principal, Kinetica
Kevin MacLean, Associate, Read Jones Christoffersen Ltd.
Hezi Mena, Senior Vice President, WSP
John Viise, Associate Principal, Halvorson and Partners
Ahmad Abdelrazaq, Senior Executive Vice President, Samsung C&T
Congzhen Xiao, Deputy Chief Engineer, China Academy of Building Research
Speakers answer delegates questions at the end of the technical workshop

Design of a Slender Building with High-Performing VE Dampers

Michael Montgomery, Principal, Kinetica described his patented invention, the Viscoelastic Coupling Damper for high-rise buildings. Montgomery won the top prize for the 2011 Innovation Challenge Award, a Canadian national award recognizing inventions that have the potential of translating into real-world applications. Michael Montgomery was joined on stage by Kevin MacLean, Associate at Read Jones Christoffersen Ltd., to further express his points.

Constantin Christopoulos, Chief Technical Officer at Kinetica, introduces the speakers. Michael Montgomery, Principal at Kinetica, and Kevin MacLean, Associate at Read Jones Christoffersen Ltd.
Sustainability and High Rise Buildings – 56 Leonard Street

Hezi Mena, Senior Vice President, WSP Group, discussed some of the elaborate structural engineering efforts that took place to stabilize the eccentric shapes of several iconic New York City skyscrapers under construction or recently completed, including One World Trade Center, Seven World Trade Center, The Solaire, Four Times Square, Hearst Tower and 56 Leonard Street.
Hezi Mena, Senior Vice President at WSP Group, explores some New York skyscrapers, including 56 Leonard Street.
John Viise, Associate Principal at Halvorson and Partners, talks about alternatives to steel brace outriggers.
BRB and FVD Alternatives to Conventional Steel Brace Outriggers

John Viise, Associate Principal at Halvorson and Partners, provided insights on two alternatives to the typical movement-mitigation strategy of attaching steel outriggers to link a central core to perimeter columns in a tall building. The study Viise presented considered two other member types for use at the outrigger locations:  a buckling restrained brace (BRB), and a fluid viscous damper (FVD).  Although these alternate approaches are less stiff, they provide superior energy dissipation under dynamic loading while avoiding the large localized forces associated with conventional outriggers.
A delegate asks a question during the Q & A session.
Optimizing the Structural Design of the 151 Story Incheon Tower

Ahmad Abdelrazaq, Head of the Building Sales Division of Samsung C&T, told the story of his team’s approach to optimizing the structural design of the 151-story Incheon Tower in South Korea. His presentation discussed the structural engineering techniques utilized to optimize the structural and foundation systems of the tower, the different floor framing systems considered, and  the wind engineering approach to reduce the overall wind forces and to tame the dynamic response of the tower. Abdelrazaq also provided  a description of an additional reliable damping system that is well integrated with the structural and the architectural design concepts to improve the tower’s overall behavior, as well as the impact of foundation flexibility on the overall behavior of the tower, through soil structure interaction.
Ahmad Abdelrazaq, Head of the Building Sales Division of Samsung C&T, speaks about the Incheon Tower.
Congzhen Xiao, Deputy Chief Engineer at the China Academy of Building Research, concludes the workshop.

Relationship Between Periods and Structural Heights

Finally, Congzhen Xiao, Deputy Chief Engineer, China Academy of Building Research, explained the relationship between buildings’ periods of oscillation and their optimal structural heights. Xiao explored factors that have affected the design of hundreds of buildings since the late 1960s, including story drift limits, base shear ratios, and global stability. He cautioned against the continued application of standards developed for low-rise buildings in high-rise design.