Improved analytic method for outrigger structures considering floor stiffness |
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Authors: | Lin Chen Ping Tan Xiaofeng Zhao Yafei Xu Fulin Zhou |
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Affiliation: | 1. College of Civil Engineering, Hunan University, Changsha, China;2. Earthquake Engineering Research and Test Center, Guangzhou University, Guangzhou, China;3. College of Civil Engineering, Hunan University, Changsha, China
Earthquake Engineering Research and Test Center, Guangzhou University, Guangzhou, China
Key Laboratory of Earthquake Engineering and Applied Technology in Guangdong Province, Guangzhou, China |
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Abstract: | Current analytical models for outrigger structures in super high-rise buildings tend to oversimplify by not considering the stiffness of individual floors. This paper introduces a more refined calculation model, based on the substructure method, which takes floor stiffness into account. To verify our proposed approach, we derived a mathematical algorithm and developed a finite element model using ANSYS. When compared to traditional methods that only account for outrigger stiffness, our model, which incorporates both outrigger and floor stiffness, provides improved accuracy in calculating vertex displacement. It also suggests an upward shift in the optimal position for the outrigger and bolsters the overall building's lateral stiffness. To further our analysis, we introduced an equivalent stiffness calculation formula, using the Bayesian parameter estimation method. When applied to dynamic analysis, this formula aligns closely with the results from the finite element simulations. Furthermore, the suggested algorithm for determining the best position for the outrigger is consistent with theoretical calculations. By considering the contribution of regular floors to the overall structure, we found that the fitted equivalent core tube stiffness offers a reliable reflection of structural stiffness. Lastly, when this equivalent stiffness was applied to a dynamic analysis based on Rayleigh's energy method, there was a noticeable reduction in computational effort. This yields not only more efficient calculations but also precise results, rendering it particularly valuable during the initial design phases of high-rise buildings. |
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Keywords: | equivalent stiffness optimal outrigger position outrigger structure Rayleigh energy method substructure method super high-rise buildings |
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