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Hi Sun Choi
Equity, Diversity, and Inclusion Committee Vice-Chair
Thornton Tomasetti, Inc., Senior Principal RET | New York City, United States
About
Hi Sun Choi has more than 30 years of experience in the structural analysis, design and review of supertall buildings. She was a senior principal with Thornton Tomasetti until 2022, and is now a consultant. She has specializations in the design of deep foundations, optimized structural systems for wind and seismic control, and performance-based seismic design. Over the course of her career, Hi Sun served as the lead designer and project manager of high-profile projects on several continents. These include Barclays Investment Bank headquarters and 30 Hudson Yards in New York City; We’ve the Zenith, Seoul International Financial Center and New Songdo City in South Korea; Shanghai Tower in China; SOCAR Tower in Azerbaijan; and Al Thumama Stadium in Qatar.
Hi Sun serves as co-chair of CTBUH Equity, Diversity, and Inclusion Committee and the International Journal of High-Rise Buildings as an…
CTBUH Designated Expert
CTBUH Roles
Equity, Diversity, and Inclusion Committee, Vice-Chair (2020 – Present)
Awards Equity, Diversity, & Inclusion Jury (Chair 2023; 2024; Chair 2025)
Annual Conference, Presenter (China 2016; Chicago 2019)
Working Group: Outrigger Design, Co-Chair (2011 – 2012, 2016 – 2017)
CTBUH Initiatives
Videos
10 October 2011
Outrigger System Design Guide from CTBUH Outrigger Working Group to be Released
As outrigger systems have been widely used in supertall building design since 1980's, CTBUH recognized a need for general design guidelines and formed the Outrigger...
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Research
08 August 2017
Frontiers in High-Rise Outrigger Design
Hi sun Choi & Leonard M. Joseph, Thornton Tomasetti; SawTeen See, Leslie E. Robertson Associates; Rupa Garai, Skidmore, Owings & Merrill LLP
In 2012, CTBUH published the first Outrigger Design for High-Rise Buildings Technical Guide. In 2016, the CTBUH Outrigger Working Group felt it would be beneficial...
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Research
17 October 2016
Structural Challenges with the SOCAR Tower in Baku, a New Megacity in the Caspian Region
Hi Sun Choi & Onur Ihtiyar, Thornton Tomasetti, Inc.; Young Kyoon Jeong & Hyungsup Sim, Heerim Architects & Planners
Baku, the capital of Azerbaijan, has been rapidly transforming into a hub of high-rise buildings and cultural centers in the Caspian region. Baku’s population now...
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CTBUH Initiatives
26 October 2015
Second CTBUH Damping Research Meeting
Nearly 30 industry professionals and academic experts were in attendance at the second meeting for the CTBUH research project on damping.
18 September 2012
Outrigger Workshop, Shanghai
The workshop attracted 18 professionals from various backgrounds, including structural engineers, architects, construction managers, professors and researchers.
9 October 2011
2011 CTBUH Leaders Meeting
Tall building industry leaders from around the globe met at the seminal Dongbu Financial Center tower for the 2011 CTBUH Leaders Meeting.
27 August 2010
Korea Chapter 2010 Conference
The Korean CTBUH Conference 2010 was held at Seoul Olympic Parktel Olympia Hall and hosted by the CTBUH Korea.
Videos
Filter by
10 October 2011
Outrigger System Design Guide from CTBUH Outrigger Working Group to be Released
As outrigger systems have been widely used in supertall building design since 1980's, CTBUH recognized a need for general design guidelines and formed the Outrigger...
Research
08 August 2017
Frontiers in High-Rise Outrigger Design
Hi sun Choi & Leonard M. Joseph, Thornton Tomasetti; SawTeen See, Leslie E. Robertson Associates; Rupa Garai, Skidmore, Owings & Merrill LLP
In 2012, CTBUH published the first Outrigger Design for High-Rise Buildings Technical Guide. In 2016, the CTBUH Outrigger Working Group felt it would be beneficial...
17 October 2016
Structural Challenges with the SOCAR Tower in Baku, a New Megacity in the Caspian Region
Hi Sun Choi & Onur Ihtiyar, Thornton Tomasetti, Inc.; Young Kyoon Jeong & Hyungsup Sim, Heerim Architects & Planners
Baku, the capital of Azerbaijan, has been rapidly transforming into a hub of high-rise buildings and cultural centers in the Caspian region. Baku’s population now...
16 September 2014
Two-In-One Tower: An Expansion in Typology and Technology in Hanoi
Matthias Olt, Callison; Hi Sun Choi, Thornton Tomasetti
Standing 267m tall, Lotte Center Hanoi is Vietnam’s second tallest tower and set to open this summer. Innovative high-rise design solutions were incorporated that respond...
01 March 2014
Hi Sun Choi, Onur Ihtiyar & Leonard Joseph, Thornton Tomasetti; James Sze, Arup
Baku, the capital of Azerbaijan, has seen a boom in construction in recent years. The old Baku city has been rapidly transforming into a new...
01 September 2012
Outrigger System Design Considerations
Hi Sun Choi and Leonard Joseph, Thornton Tomasetti
Outrigger systems have been widely used in supertall buildings constructed since the 1980’s, eclipsing previously favored tubular frame systems. However, outriggers are not listed as...
10 October 2004
Structural Design of the Tallest Concrete Tower in Korea, the # Star City
Hi Sun Choi & Dennis Poon, Thornton Tomasetti; Jongho Kim, Chang & Minwoo Structural Consultant; Seongsoo Kim, Seong-Jin Structural Group
Residential high-rise buildings, such as apartments and condominiums, were introduced to provide multiple residential spaces in urban and suburban areas for their economic advantage and...
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