HYBRID STRUCTURE LABORATORY (Hi Structure)

The Research Lab focuses on hybrid building structure related fields. The first interest is an innovative composite structural member including the shallow beam with the hollow core, the iFLASH system, and steel concrete column. Secondly, the research members are scrutinizing the free form structural researches as diagrid system. Another interest is a high-performance material based structural engineering including the prediction and compensation of column shortening, the vibration control, and the structural behavior of high-performance steel.

High-rise buildings are expanding as landmarks of cities throughout the world. As the number of the buildings increases, a new trend of buildings such as twisted, tilted, and tapered shape has arisen. As a structural solution for these new trend buildings, diagrid system was developed.
Diagrid structural system is gaining acceptance as the most appropriate structural system for free form high-rise buildings. It consists of triangular modules without vertical columns. Diagrid consists of beam and brace members only and hence shows a marked difference in structural performance, depending on the angle of the diagrid node.

Diagrid structure system is required to review the stability of diagrid structures under lateral loads, such as wind and seismic loads. In order to evaluate the stability of the diagrid structure under seismic load a non-liner analysis should be performed. The diagrid structure is one of the typical free-form structures. Diagrid structures are used in high-rise buildings. It is required to review for stability of diagrid structures under lateral loads, such as wind loads and seismic loads. The diagrid system is very complicated to seismic design due to node shape.

In order to evaluate the stability of the diagrid structure under seismic load a non-liner analysis should be performed. A non-linear analysis is required for the performance curve of the structural member.

Therefore, a new method of the performance curve in inelastic region is required for the diagrid structures.

Our labatory suggested an exact performance evaluation method of the diagrid structure system. And the seismic evaluation process by the proposed method.