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IASS-SLTE Symposium 2014: Shells, Membranes and Spatial Structures: Footprints


IASS Symposium 2014

SESSION: General 4: Structural Stability

Internal force control and optimization for outrigger system of super tall buildings

< Table of Contents for General 4: Structural Stability
  • Proceedings Name: IASS-SLTE Symposium 2014: Shells, Membranes and Spatial Structures: Footprints
  • ISSN: (Electronic Version) 2518-6582
  • Session: General 4: Structural Stability
  • Title: Internal force control and optimization for outrigger system of super tall buildings
  • Author(s): Lilin WANG, Yimin ZHENG, Xin ZHAO
  • Keywords: Outrigger system, super tall building, internal force control and optimization, differential shortening,construction sequence, time dependent loading effects
Abstract
Outrigger system has been widely applied during the construction surge of super tall buildings in Asia over the last decade. The discrete set of outriggers is smeared over the height to give an equivalent uniform connecting medium between the central core and the perimeter columns. Outrigger system contributes significantly to the overall stiffness and stability of the building, and the internal forces of outrigger system are commonly of great amplitude due to its rule of coordinating the deflection and deformation between different vertical members. The control and optimization of the outrigger internal forces have to consider the construction sequence, lock-in arrangement of outrigger systems, member sections and differential shortening of different vertical members. An innovative method is proposed in this paper to control and optimize the internal forces of outrigger system of super tall buildings. On the one hand, the proposed method can minimize the secondary forces due to differential shortening; on the other hand, it can optimize the design of outrigger system by considering the time dependent loading effects. A super tall building is taken as an example to illustrate the effectiveness of the proposed control and optimization method.

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