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Young K. JU, is an assistant professor at Korea University and an Steering Committee member of Korean Council on Tall Buildings and Urban Habitat (Korean CTBUH). He has been a structural engineering researcher to Daewoo E&C(1995~2003), The University of Texas at Austin(2003~2005) and Research Institute of Science & Technology (2005~2007). He has also served on Editorial Board Member of International Journal of Steel Structures. More than 100 papers and articles have been published. Professor Ju's latest book Skyscrapers: Examples was published by Goomibooks in 2005.



Info about Korea University


The KU campus covers over 182 acres and is home to more than 35,000 students from all over the nation and the world. With its stately stone architecture, sprawling lawns, seasonal trees and natural flora, KU is known to have one of the most beautiful campuses in Korea. The students of KU represent Korea's dream as they are among the nation's brightest and most ambitious. 


KU is nationally recognized for its commitment to teaching and academic excellence. The university’s academic breadth is extensive with its 81 departments in 19 colleges & divisions, and 18 graduate schools and it has over 1,400 full-time faculty members with over 95% of them holding a Ph.D. or equivalent qualification in their field. KU has particularly strong Humanities and Asian Studies Departments along with the recently established Graduate School of International Studies (GSIS). KU is also renowned for its professional schools of Law, Medicine and Business Administration. In research, KU is an internationally recognized leader with over 100 research centers, including the East Asiatic Research Centre and the Korean Cultural Research Centre. Furthermore, Korea University Business School (KUBS) is the only and the first business school in the country to have acquired both European Quality Improvement System (EQUIS) accreditation, in combination with the accreditation granted by the Association to Advance Collegiate Schools of Business (AACSB).


Unlike many universities in Korea, KU prides itself not only in being a progressive and globally conscious institution but also one that plays a role in preserving and developing Korea’s unique culture.


Korea University (KU), founded in 1905, is widely acknowledged as one of the country’s oldest, largest and top-ranked universities in Korea. Its reputation for quality is based on excellence in teaching, research and service to Korean society. An eminent faculty, outstanding students and internationally recognized research programs all contribute to the KU’s academic fame. As a major comprehensive university, KU offers a rich variety of courses in Liberal Arts and Sciences as well as in all professional fields, including Law, Medicine and Business Administration.

Cyclic Test of Diagrid Nodes for Lotte Super Tower 

Young K. Ju1), Young-Joo Kim1), In-Yong Jeong1), Soon-Jeon Park2), Jin-Ho Kim3), Sang-Dae Kim1)

  1. Dept. of Architectural, Civil and Environmental Eng., Korea University, South Korea
  2. Lotte Eng. & Construction, South Korea
  3. Research Institute of Science & Technology, South Korea


 Recently the use of diagrid structural systems for structural effectiveness and architectural esthetics has been developed. The diagrid system takes advantage of the structural efficiency to reduce the required structural material quantity when compared to a building with a conventional braced core or rigid framed perimeter tube structure. However, few studies or detailed structural analyses of the diagrid structural system nodes. In this study, the cyclic test was performed to investigate the structural performance of diagrid nodes for the seismic loads.

 Keywords: Diagrid nodes, High-rise building, Structural performance, Welding type, Cyclic test

1. Introduction

The diagrid structural system is gaining acceptance as architecture’s newest trend. Ever growing numbers of buildings today are being designed and completed using the diagrid system, which refers to the use of triangular column and brace modules. This is similar to the strut-tie mechanism’s stiffness and efficiency in resisting external force. It is expected that the diagrid structural system will be extended into more markets, so there have been many studies and structural analyses of its efficiency as a function of the installation angle of the diagonal brace, but few studies or detailed structural analyses of the joint section comprising the diagrid structural system. To design high-rise buildings based on the diagrid structural system, it is also necessary to measure its performance under lateral loads such as wind and seismic loads.