Techno Press

Steel and Composite Structures   Volume 20, Number 5, April10 2016, pages 1133-1153
Additive 2D and 3D performance ratio analysis for steel outrigger alternative design
Dongkyu Lee

Abstract     [Full Text]
    In this article, an additive performance ratio method using structural analysis of both 2D and 3D is introduced to mitigate the complexity of work evaluating structural performances of numerous steel outrigger alternatives in multi-story buildings, especially high-rise buildings. The combined structural analysis process enables to be the design of economic, safe, and as constructional demanding structures by exploiting the advantages of steel, namely: excellent energy dissipation and ductility. First the approach decides the alternative of numerous steel outriggers by a simple 2D analysis module and then the alternative is evaluated by 3D analysis module. Initial structural analyses of outrigger types are carried out through MIDAS Gen 2D modeling, approximately, and then the results appeal structural performance and lead to decide some alternative of outrigger types. ETABS 3D modeling is used with respect to realization and evaluation of exact structural behaviors. The approach reduces computational burden in compared to existing concepts such as full 3D analysis methods. The combined 2D and 3D tools are verified by cycle and displacement tests including comprehensive nonlinear dynamic simulations. The advantages and limitations of the Additive Performance Ratio Approach are highlighted in a case study on a high rise steelcomposite building, which targets at designing the optimized alternative to the existing original outrigger for lateral load resisting system.
Key Words
    additive performance ratio method; structural analysis; steel outrigger; high-rise building; alternative; lateral load resisting system
Department of Architectural Engineering, Sejong University, Seoul, 143-747, Korea.

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