Denarié Emmanuel, Fady Nicolas
Division of Maintenance and Safety of Structures (MCS-ENAC), Ecole Polytechnique Fédérale de Lausanne (EPFL), GC B3 435, Station 18, CH-1015 Lausanne, Switzerland.
CEREMA - DtecEmf/DT/TSMF/PIE, Technopôle Brest Iroise B.P. 5, 155, Rue Pierre Bouguer, 29280 Plouzané, France.
Philos Trans A Math Phys Eng Sci. 2019 Sep 7;377(2155):20190011. doi: 10.1098/rsta.2019.0011. Epub 2019 Aug 19.
Offshore lighthouses are a remarkable historical heritage often over 100 years old. The management of their ageing is a challenge and requires a thorough understanding of their structural response under wave loading. With this aim in view, the dynamic response of the 'La Jument' lighthouse in the French Iroise Sea was characterized in situ, with accelerometers, under the action of a breaking wave, during a winter storm in January 2018. Detailed exploitation of the measurement data complemented by photographic documentation of the same wave event helped determine eigenfrequencies and damping coefficients of the structure as well as the likely orientation of the wave and the position of its crest with respect to the lighthouse tower. The results of these analyses were put into perspective with those of literature and more specifically from three-dimensional finite element modelling of the structural response of the lighthouse under the action effects of breaking waves. This article is part of the theme issue 'Environmental loading of heritage structures'.
近海灯塔是一项非凡的历史遗产，通常有100多年的历史。对其老化进行管理是一项挑战，需要全面了解其在波浪荷载作用下的结构响应。出于这一目的，2018年1月冬季风暴期间，在法国伊洛伊斯海的“拉朱门”灯塔上，利用加速度计对其在破碎波作用下的动态响应进行了现场表征。对测量数据的详细分析，并辅以同一波浪事件的摄影记录，有助于确定结构的固有频率和阻尼系数，以及波浪的可能方向及其波峰相对于灯塔塔的位置。这些分析结果与文献中的结果，更具体地说是与灯塔在破碎波作用效应下结构响应的三维有限元建模结果进行了对比。本文是主题为“遗产结构的环境荷载”的一部分。
