Survivability assessment of fastnet lighthouse

Antonini, Alessandro; Raby, Alison; Pappas, Athanasios; D’Ayala, Dina

doi:10.1016/j.coastaleng.2019.03.007

Cited by 13 publications

(15 citation statements)

References 29 publications

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“…Following Antonini et al . [24], the threshold and time span selection are based on three diagnostic plots. The mean residual life plot is shown in figure 13 a , the dispersion index proposed by Cunnane [29], shown in figure 13 b and the extremal index first applied by Ferro [30], shown in figure 13 c .…”

Section: Wave Loadingmentioning

confidence: 99%

“…Eight threshold values are investigated as well as 14 declustering time spans, with conclusions similar to those achieved by Antonini et al . [24]. The smallest tested threshold value above the Poisson limit, i.e.…”

Section: Wave Loadingmentioning

confidence: 99%

“…The identification of the impulsive wave loading on the lighthouse comprises five steps as described in detail by Antonini et al . [24]: Characterization of the offshore extreme wave climate to propagate to the lighthouse location (from the last subsection).Estimation of the significant wave height at Wolf Rock location ( H S,L ) by means of Goda's method [42]. The required data, i.e.…”

Section: Wave Loadingmentioning

confidence: 99%

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Wolf Rock lighthouse: past developments and future survivability under wave loading

Raby

Antonini

Pappas

et al. 2019

Phil. Trans. R. Soc. A.

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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. This article is part of the theme issue ‘Environmental loading of heritage structures’.

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Section: Wave Loadingmentioning

confidence: 99%

Section: Wave Loadingmentioning

confidence: 99%

Section: Wave Loadingmentioning

confidence: 99%

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Wolf Rock lighthouse: past developments and future survivability under wave loading

Raby

Antonini

Pappas

et al. 2019

Phil. Trans. R. Soc. A.

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“…The UK and Irish General Lighthouse Authorities (GLAs), namely The Corporation of Trinity House, the Northern Lighthouse Board and the Irish Lights (responsible for England, Wales, the Channel Islands and Gibraltar; Scotland; and Northern Ireland and the Republic of Ireland, respectively), need to systematically study the conditions of these heritage structures, primarily focusing on the remaining operational life in light of climate change, with the increase in sea level and the possibility of increased storminess (frequency and magnitude). Therefore, the STORMLAMP project, funded by the UK Engineering and Physical Sciences Research Council (EPSRC), selected Wolf Rock lighthouse ( Figure 1b) as one of the seven lighthouses investigated under the project (Raby et al (2019) [1], Antonini et al (2019) [8]). This study investigated the differences in the dynamic structure responses of offshore rock lighthouses due to different pressure distributions.…”

Section: Introductionmentioning

confidence: 99%

“…storminess (frequency and magnitude). Therefore, the STORMLAMP project, funded by the UK Engineering and Physical Sciences Research Council (EPSRC), selected Wolf Rock lighthouse ( Figure 1b) as one of the seven lighthouses investigated under the project (Raby et al (2019) [1], Antonini et al (2019) [8]). This study investigated the differences in the dynamic structure responses of offshore rock lighthouses due to different pressure distributions.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Spatial Pressure Distribution of Breaking Wave Loading on the Dynamic Response of Wolf Rock Lighthouse

Dassanayake

Antonini

Pappas

et al. 2021

JMSE

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The survivability analysis of offshore rock lighthouses requires several assumptions of the pressure distribution due to the breaking wave loading (Raby et al. (2019), Antonini et al. (2019). Due to the peculiar bathymetries and topographies of rock pinnacles, there is no dedicated formula to properly quantify the loads induced by the breaking waves on offshore rock lighthouses. Wienke’s formula (Wienke and Oumeraci (2005) was used in this study to estimate the loads, even though it was not derived for breaking waves on offshore rock lighthouses, but rather for the breaking wave loading on offshore monopiles. However, a thorough sensitivity analysis of the effects of the assumed pressure distribution has never been performed. In this paper, by means of the Wolf Rock lighthouse distinct element model, we quantified the influence of the pressure distributions on the dynamic response of the lighthouse structure. Different pressure distributions were tested, while keeping the initial wave impact area and pressure integrated force unchanged, in order to quantify the effect of different pressure distribution patterns. The pressure distributions considered in this paper showed subtle differences in the overall dynamic structure responses; however, pressure distribution #3, based on published experimental data such as Tanimoto et al. (1986) and Zhou et al. (1991) gave the largest displacements. This scenario has a triangular pressure distribution with a peak at the centroid of the impact area, which then linearly decreases to zero at the top and bottom boundaries of the impact area. The azimuthal horizontal distribution was adopted from Wienke and Oumeraci’s work (2005). The main findings of this study will be of interest not only for the assessment of rock lighthouses but also for all the cylindrical structures built on rock pinnacles or rocky coastlines (with steep foreshore slopes) and exposed to harsh breaking wave loading.

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Extreme Sea Level Variation in Future Climate Change Scenarios: The Case of Abruzzo Region Coastal Area

Pasquali,

Celli,

Di Nucci

et al. 2024

Lecture Notes in Civil Engineering

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Survivability assessment of fastnet lighthouse

Cited by 13 publications

References 29 publications

Wolf Rock lighthouse: past developments and future survivability under wave loading

Wolf Rock lighthouse: past developments and future survivability under wave loading

Influence of the Spatial Pressure Distribution of Breaking Wave Loading on the Dynamic Response of Wolf Rock Lighthouse

Extreme Sea Level Variation in Future Climate Change Scenarios: The Case of Abruzzo Region Coastal Area

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