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Integrated wind load analysis and stiffness optimization of tall buildings with 3D modes

机译：采用3D模式的高层建筑的集成风荷载分析和刚度优化

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摘要

Recent trends towards constructing taller buildings with irregular geometric shapes imply that these structures are potentially more responsive to wind excitation. The wind-induced motion of modern tall buildings is generally found to involve with significant coupled lateral and torsional effects, which are attributed to the asymmetric three-dimensional (3D) mode shapes of these buildings. The 3D coupled modes also complicate the use of high frequency force balance (HFFB) technique in wind tunnel testing for predicting the wind-induced loads and effects on tall buildings. This paper firstly presents the analysis of equivalent static wind loads (ESWLs) on tall buildings with 3D modes provided that the wind tunnel derived aerodynamic wind load spectra are given. Then an integrated wind load updating analysis and optimal stiffness design technique is developed for lateral drift design of tall asymmetric buildings involving coupled lateral-torsional motions. The results of a practical 40-storey building example with significant swaying and torsional effects are presented. Not only is the technique able to produce the most cost efficient element stiffness distribution of the structure satisfying multiple serviceability wind drift design criteria, but a potential benefit of reducing the wind-induced loads can also be achieved by the stiffness design optimization method.
机译：建造具有不规则几何形状的高层建筑的最新趋势表明，这些结构可能对风激励更加敏感。通常发现，现代高层建筑的风致运动涉及显着的横向和扭转效应，这归因于这些建筑的不对称三维（3D）模式形状。 3D耦合模式还使高频力平衡（HFFB）技术在风洞测试中的使用复杂化，以预测风荷载和对高层建筑的影响。本文首先给出了高层建筑在3D模式下的等效静风荷载（ESWL）的分析，前提是给出了风洞导出的气动风荷载谱。然后，针对高层非对称建筑物的横向漂移设计，研究了涉及风向耦合扭转运动的集成风荷载更新分析和最佳刚度设计技术。介绍了一个实用的40层建筑示例的结果，该示例具有明显的摇摆和扭转效果。该技术不仅能够产生满足多种适用性风漂移设计标准的结构的最具成本效益的单元刚度分布，而且通过刚度设计优化方法还可以实现减少风致载荷的潜在好处。

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