Optimal position of outriggers for minimizing the base moment under lateral load

Document Type : Research Article

Author

Department of civil engineering/Islamic Azad University of Torbate jam

Abstract

In this paper, the optimum position of Outriggers in a structure for minimizing the base moment under lateral loads is investigated. To do so, the base moment and top story displacement are formulated. Then, a Matlab code is employed to find the optimum positions of the Outriggers. Different kinds of lateral loads including concentrated, uniform, triangular and a combination of such loads are taken into account. Moreover, the effects of the variation of structural elements such as columns, Outriggers and core on the base moment and top story displacement are examined. The outcomes indicated that the optimum points of Outriggers get closer when the flexural rigidity of Outriggers increases. Furthermore, it is shown that the greatest decrease in the base moment occurs in a specific range which depends on the structure parameters such as axial rigidity of columns, the distance of columns, the flexural rigidity of Outriggers and height of the structure. The results show that when the wind load intensity increases, the optimum position of the Outriggers will move to the top of the structure.

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References

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Amirkabir Journal of Civil Engineering
Volume 54, Issue 8
November 2022
Pages 3009-3024

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