Dynamical performances of a wind‐excited high‐rise structure equipped with a multiblock movable faca̧de

Giulia Di Giovanni, Davide Bernardini, P. Di Re, D. Ruta
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Abstract

In 2005, Moon proposed to equip tall buildings with movable façades to improve structural performance. Previous studies showed that, although this could be very effective in mitigating wind‐induced vibrations, its applicability is limited, as façades tend to exhibit excessive relative displacements. To solve this issue, two improvements are proposed in this work. First, the original idea of a monolithic façade is generalized to a Multiblock Movable Façade (MMF) where the external building skin is segmented into several independent blocks. Second, a friction slider equipped with bumpers is used to realize a dissipative connection capable of limiting the displacements of the façade. To evaluate the applicability of these ideas, the case study of a tall building (the Isozaki tower in Milan, Italy) is considered. Dissipative sliders are modeled as nonlinear hysteretic elements incorporated into a finite element model of the building. Numerical simulations of the dynamical effects of wind‐actions are carried out to compare the performances of the building with and without MMF. The results show that the actions transmitted to the building by the façade can be tuned by properly setting the characteristics of the MMF system to achieve satisfactory performance in terms of maximum displacements and accelerations.
装有多块活动面的风动高层结构的动力性能
2005 年,Moon 提议为高层建筑配备活动外墙,以改善结构性能。之前的研究表明,虽然这种方法可以非常有效地缓解风引起的振动,但其适用性有限,因为外墙往往会表现出过大的相对位移。为了解决这个问题,本研究提出了两个改进方案。首先,将最初的整体外墙概念推广到多块可移动外墙 (MMF),在多块可移动外墙中,建筑外表皮被分割成几个独立的块。其次,使用配有缓冲器的摩擦滑块来实现耗散连接,从而限制外墙的位移。为了评估这些想法的适用性,我们考虑了一栋高层建筑(意大利米兰的矶崎塔)的案例研究。耗散滑块被建模为非线性滞后元件,并纳入建筑物的有限元模型中。对风作用的动态效应进行了数值模拟,以比较有 MMF 和无 MMF 建筑的性能。结果表明,可以通过适当设置 MMF 系统的特性来调整外墙传递给建筑物的作用,从而在最大位移和加速度方面获得令人满意的性能。
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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