Monitoring of the Hautbois Wooden High-Rise building in Grenoble, France (RESIF-SISMOB)

The emergence in the last 5 years of Tall Wood Buildings is part of the development of the wood industry and represents one of the relevant responses to current environmental and urban densification constraints. Among the technical challenges posed by such buildings, horizontal oscillations are a key issue. Indeed, the strength / lightness ratio of wood gives buildings interesting properties regarding earthquake but also more difficult to manage regarding wind loads, with induced vibrations that can be detrimental to the comfort of the occupants. Opertional Modal analysis on wooden structures showed significant variations in the dynamic properties of wooden high-rise buildings (frequencies, damping…) ans many questions are related to the evolution over time (at during its use) of the dynamic properties of wood high-rise buildings. The scientific objectives of this experiment are therefore: the modal analysis of the wooden structure under ambient vibrations; the evaluation of modal fluctuations over time and their impact in terms of building performance (comfort and earthquake); the interpretation of the physical processes at the origin of these fluctuations. The selected building is a wooden high-rise (9 stories) building under construction (2020-2021) as part of the "Le Haut-Bois" project .

过去五年间，高层木结构建筑（Tall Wood Buildings）的兴起是木材工业发展的重要组成部分，亦是应对当下环保要求与城市高密度化发展约束的关键路径之一。此类建筑面临的技术挑战中，水平振动属于核心问题。诚然，木材的强度-轻质比赋予建筑优异的抗震特性，但同时也使得其抗风荷载设计更具难度，由此引发的振动会对居住者的舒适度造成不利影响。针对木结构开展的工作模态分析（Operational Modal Analysis）显示，高层木结构建筑的动态特性（频率、阻尼等）存在显著波动，而关于高层木结构建筑动态特性在使用周期内的演化规律，目前仍存在诸多待解课题。因此本实验的科学目标包括：对环境振动下的木结构开展模态分析；评估模态特性随时间的波动情况及其对建筑性能（居住舒适度与抗震性能）的影响；阐释此类波动背后的物理机制。本次研究选取的建筑为2020至2021年期间处于施工阶段的9层高层木结构建筑，属于"Le Haut-Bois"项目的组成部分。