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Forces and Displacements of Outrigger-Braced Structures with a Pair of Coupled Cores  

정동조 (전주대학교 공학부)
이태희 (전주대학교 대학원 건축공학과)
Publication Information
Journal of the Computational Structural Engineering Institute of Korea / v.16, no.3, 2003 , pp. 291-299 More about this Journal
Abstract
Based on the continuum approach, an investigation is made to get the forces and displacements of laterally loaded outrigger braced structures with a pair of coupled cores, and to show the effect of stiffening outriggers on the behavior of the structure. From the condition that the rotation of the core at the outrigger level is matched with the rotation of the corresponding outrigger, the outrigger restraining moment is derived analytically. From this, the core moment diagram, the column axial forces, and the horizontal displacements of the structure may be determined. Comparisons with the results by the program MIDAS-GEN for the structural models, have shown that this analysis can give reasonably accurate results for outrigger-braced structures with a pair of coupled cores. And a lateral displacement at the top of the structure is influenced by the outrigger location than the core location. Although the formulae are accurate only for idealized outrigger braced structures, they have a useful practical purpose in providing a guide to the behavior, and for making approximate estimates of the forces and displacements, in practical outrigger braced structures with a pair of coupled cores.
Keywords
outrigger; coupled core; restraining moment; core moment; horizontal deflection;
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