영문으로 작성된 초대형 대각 가새 시스템에 대한 간략한 설명과 실제 사용된 건물에 대한 조사 레포트입니다.
2. Diagrid Systems
3. Hearst Building
․ Most of the structural systems deployed for early tall buildings were steel frames with diagonal bracings of various configurations such as X, K and eccentric brace.
․ While the structural importance of diagonals was well recognized, their aesthetic potential was not explicitly appreciated in the late 19th century early designs of tall buildings.
․ A major departure from this design approach occurred when braced tubular structures were introduced in the late 1960s.
Building in Chicago)
Fig 1. John Hancock Building, Chicago
Ⅱ. Diagrid Structure
Almost all the conventional vertical columns of diagrid structures can be eliminated because the diagonal members in diagrid structural systems can carry gravity loads as well as lateral forces owing to their triangulated configuration, whereas the diagonals in conventional braced frame structures carry only lateral loads. Compared with conventional framed tubular structures without diagonals, diagrid structures are much more effective in minimizing shear deformation because they carry shear by axial action of the diagonal members, while conventional framed tubular structures carry shear by the bending of the vertical columns.
Fig 2. Braced Tube vs. Diagrid Structure
Another prevalent structural system for today’ tall buildings is outrigger structures with either reinforced concrete cores or steel-braced cores. Properly designed, an outrigger structure is effective in reducing the moment and drift of the building below outriggers. However, the system does not provide shear rigidity, whereas the diagrid structure provides both bending and shear rigidity.
1) Kyung-Sun Moon, THE STRUCTURAL DESIGN OF TALL AND SPECIAL BUILDINGS Struct. Design Tall Spec. Build. 16, 205–230 (2007)
2) MODERN STEEL CONSTRUCTION (APRIL 2007)