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Stochastic design of double-skin façades as seismic vibration absorbers
Advances in Engineering Software ( IF 4.0 ) Pub Date : 2020-02-19 , DOI: 10.1016/j.advengsoft.2019.102749
Giovanni Pipitone , Giorgio Barone , Alessandro Palmeri

Double-skin façades (DSFs), usually designed for aesthetic reasons or energy saving purposes, have been recently proposed as an alternative mean of passive control, able to reduce the effects of dynamic actions on building structures. This paper presents a novel approach to optimise their design as distributed vibration absorbers (VAs). Four key design parameters have been chosen to represent the façade, namely its flexural stiffness and viscous damping ratio, along with the stiffness of the elements connecting the façade to the primary structure. The optimisation is achieved by minimising the variance of the building’s dynamic response, conveniently computed in a stochastic framework. Solutions are obtained using genetic algorithms (GAs), including nonlinear constraints limiting the relative displacements between primary and secondary structures. Computational efficiency of the optimisation procedure is largely improved, compared to previous works, by characterising the seismic action as a stationary random process, fully defined by some closed-form analytical expressions for the power spectral density (PSD) function consistent with target response spectra. Four configurations of double-skin façades have been analysed, including single and multi-panel layouts, spanning one to six storeys, and their efficiency has been quantified. Results are compared with those obtained directly in the time domain by numerical integration of the equations of seismic motion for a suite of recorded accelerograms, showing a good level of consistency.



中文翻译:

双层外墙作为减震器的随机设计

双层外墙(DSF)通常是出于美学原因或节能目的而设计的,最近已被提议作为被动控制的替代手段,能够减少动态作用对建筑结构的影响。本文提出了一种新颖的方法来优化其作为分布式减震器(VA)的设计。已经选择了四个关键的设计参数来表示立面,即其抗弯刚度和粘性阻尼比,以及将立面连接到主结构的元素的刚度。通过最小化建筑物动态响应的方差来实现优化,方便地在随机框架中进行计算。使用遗传算法(GA)获得解决方案,其中包括限制初级和次级结构之间相对位移的非线性约束。与以前的工作相比,通过将地震作用表征为平稳的随机过程,优化过程的计算效率得到了极大提高,该过程由一些与目标响应谱一致的功率谱密度(PSD)函数的闭式分析表达式完全定义。已分析了双层外立面的四种配置,包括单层和多层面板布局,横跨一到六层,其效率已得到量化。通过一组记录的加速度图的地震运动方程的数值积分,将结果与在时域中直接获得的结果进行了比较,显示出良好的一致性。通过将地震作用表征为平稳的随机过程,完全由一些与目标响应谱一致的功率谱密度(PSD)函数的闭式分析表达式定义。已分析了双层外立面的四种配置,包括单层和多层面板布局,横跨一到六层,其效率已得到量化。通过一组记录的加速度图的地震运动方程的数值积分,将结果与在时域中直接获得的结果进行了比较,显示出良好的一致性。通过将地震作用表征为平稳的随机过程,完全由一些与目标响应谱一致的功率谱密度(PSD)函数的闭式分析表达式定义。已分析了双层外立面的四种配置,包括单层和多层面板布局,横跨一到六层,其效率已得到量化。通过一组记录的加速度图的地震运动方程的数值积分,将结果与在时域中直接获得的结果进行了比较,显示出良好的一致性。跨越一到六层,其效率已被量化。通过一组记录的加速度图的地震运动方程的数值积分,将结果与在时域中直接获得的结果进行了比较,显示出良好的一致性。跨越一到六层,其效率已被量化。通过一组记录的加速度图的地震运动方程的数值积分,将结果与在时域中直接获得的结果进行了比较,显示出良好的一致性。

更新日期:2020-02-19
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