Design and Verification of Tuned Liquid Column Dampers for High-rise Buildings Using CFD

F. Campos, E. De Villiers, S. Cammelli
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Abstract

BMT Fluid Mechanics conducted a comprehensive flow study on the effectiveness of a pair of Tuned Liquid Column Dampers (TLCDs) aimed at mitigating wind-induced accelerations in a high-rise building. The study successfully combined Computational Fluid Dynamics (CFD) with physical model tests performed at the 6 degree-of-freedom shake table facility located at the Department of Civil Engineering of the University of Bristol. The original TLCD concept discussed in this work was proposed at the early design stages of a slender 42-storey high-end residential building located in the Middle East. On-site full-scale measurements and High Frequency Force Balance (HFFB) wind tunnel tests performed by BMT Fluid Mechanics showed that the highest occupied floors could experience excessive wind-induced motion. Depending on the inherent damping of the finished structure, this motion had the potential to exceed standard occupant comfort criteria. A new CFD methodology was developed to assess the performance of the TLCD design using the multi-phase Volume-of-Fluid (VOF) solver and dynamic mesh motion libraries available in the CFD software tool HELYX®. The damping effects introduced by the array of internal porous baffles in the TLCD were approximated using a Darcy-Forchheimer porosity model. Comparisons of free-decay damping performance between CFD results and shake table experiments for a 1:20 scale model of a 3 baffles’ TLCD configuration were found to be satisfactory for design purposes. The results for the amplitude of the net forces acting on the TLCD, as well as the frequency response measured using the free-decay logarithmic decrement approach, confirmed that the proposed CFD methodology provides an accurate representation of real operating conditions. The same CFD approach was successfully applied to model the full-scale TLCD device. With the introduction of a pair of identical purposely designed TLCDs, a 30% increase performance of the structural response of the 42-storey building to wind loading excitation was achieved.
高层建筑调谐液柱阻尼器的CFD设计与验证
BMT流体力学公司对一对调谐液柱阻尼器(tlcd)进行了全面的流动研究,旨在减轻高层建筑中的风致加速度。该研究成功地将计算流体力学(CFD)与位于布里斯托尔大学土木工程系的6自由度振动台设施进行的物理模型测试相结合。在这项工作中讨论的原始TLCD概念是在位于中东的42层高端住宅建筑的早期设计阶段提出的。BMT流体力学公司进行的现场全尺寸测量和高频力平衡(HFFB)风洞测试表明,最高的楼层可能会经历过度的风致运动。根据成品结构的固有阻尼,这种运动有可能超过标准的乘员舒适标准。利用CFD软件工具HELYX®中的多相流体体积(VOF)求解器和动态网格运动库,开发了一种新的CFD方法来评估TLCD设计的性能。采用Darcy-Forchheimer孔隙率模型模拟了TLCD内部多孔隔板阵列所带来的阻尼效应。对1∶20比例的三挡板TLCD模型的自由衰减阻尼性能进行了CFD计算和振动台实验比较,结果令人满意。作用在TLCD上的净力振幅的结果,以及使用自由衰减对数衰减方法测量的频率响应,证实了所提出的CFD方法可以准确地表示实际操作条件。同样的CFD方法成功地应用于全尺寸TLCD装置的建模。通过引入一对相同的tlcd, 42层建筑对风荷载激励的结构响应性能提高了30%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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