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Analysis of Tall Outrigger Braced Structures on Flexible Foundations Using Finite Elements Modeling

Nezhadi, Siamak | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43069 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Mofid, Masood
  7. Abstract:
  8. One of the most efficient methods in stiffening tall buildings to withstand lateral loads such as wind loading is to link the shear resisting core to the exterior columns using outrigger trusses. Many tall buildings such as Taipei 101 have benefited from outriggers. In this system, the outriggers force the perimeter frame to take part in resisting the bending moment of the lateral load acting on the structure by developing axial restraining forces in the windward and the leeward columns of the perimeter frame and forming a resisting moment.Most of the present analytical methods have studied the performance of outrigger braced structures neglecting shear deformation of the shear wall core and flexural deformation of the perimeter frame. But it is shown that these deformations can have significant effects on the performance of outrigger braced structures.
    Other studies modeled the wall-frame outrigger braced structure as a shear deformable beam and neglected the flexibility of foundation by considering the structure on a fixed foundation. However flexibility of the foundation can also have considerable effects on the performance and efficiency of outrigger braced systems. Therefore an analytical model which takes into account both shear deformation of the shear wall core and flexural deformation of the perimeter frame together with foundation flexibility is yet to be obtained.In this paper an analytical model for tall outrigger braced shear wall structures located on flexible foundations is presented which utilizes the continuum approach and one dimensional finite element method. In this model both shear and flexural deformations of the shear wall core and the perimeter frame are taken into account and the structure is modeled as a composite cantilever located on a flexible foundation, where the outriggers and the foundation are modeled as rotational springs. It is concluded that the foundation flexibility can have considerable effects on the efficiency of outrigger braced structures
  9. Keywords:
  10. Flexible Foundation ; Finite Element Modeling ; High Structures ; Outrigger Braced

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