Raby, AC;
Antonini, A;
Pappas, A;
Dassanayake, DT;
Brownjohn, JMW;
D'Ayala, D;
(2019)
Wolf Rock lighthouse: past developments and future survivability under wave loading.
Philosophical Transactions Of The Royal Society A-mathematical Physical And Engineering Sciences
, 377
(2155)
, Article 20190027. 10.1098/rsta.2019.0027.
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Abstract
Lighthouses situated on exposed rocky outcrops warn mariners of the dangers that lurk beneath the waves. They were first constructed when approaches to wave loading and structural response were relatively unsophisticated, essentially learning from previous failures. Here, we chart the evolution of lighthouses on the Wolf Rock, situated between Land's End and the Isles of Scilly in the UK. The first empirical approaches are described, followed by design aspects of the present tower, informed by innovations developed on other rocky outcrops. We focus on a particular development associated with the automation of lighthouses: the helideck platform. The design concept is described and the structure then scrutinized for future survivability, using the latest structural modelling techniques of the entire lighthouse and helideck. Model validation data were obtained through a complex logistical field operation and experimental modal analysis. Extreme wave loading for the model required the identification of the 250-year return period wave using a Bayesian method with informative prior distributions, for two different scenarios (2017 and 2067). The structural models predict responses of the helideck to wave loading which is characterized by differential displacements of 0.093 m (2017) and 0.115 m (2067) with associated high tension forces and plastic strain.
| Type: | Article |
|---|---|
| Title: | Wolf Rock lighthouse: past developments and future survivability under wave loading |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1098/rsta.2019.0027 |
| Publisher version: | https://doi.org/10.1098/rsta.2019.0027 |
| Language: | English |
| Additional information: | Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/ by/4.0/, which permits unrestricted use, provided the original author and source are credited. |
| Keywords: | lighthouses, wave loading, modal testing, wave statistics, structural response |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10082013 |
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