Impulsive wave loads on rigid structures, an experimental approach

Marzeddu, Andrea; Gironella, X.; Conejo, Agustín Sánchez-Arcilla

doi:10.2112/si65-057.1

Cited by 5 publications

(4 citation statements)

References 9 publications

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“…Although the system has the capacity to amplify and sample up to 16 channels with a maximum sampling rate of 19.2 kHz, 4.8 kHz were selected as the rate closest to that of the pressure mapping system (4 kHz per sensel). For experiments with pressure transducers Marzeddu et al (2013Marzeddu et al ( , 2014 recorded the highest impact pressure with a sampling frequency of 19.2 kHz but they concluded that a satisfactory description of the pressure pulse can be acquired with a minimum of 2.4 kHZ.…”

Section: Pressure Transducers and Load Cellsmentioning

confidence: 99%

Measuring wave impact induced pressures with a pressure mapping system

Stagonas

Marzeddu

Gironella

et al. 2016

Coastal Engineering

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The use of a pressuremapping system formeasuring wave impact induced pressures is evaluated in this paper. A set-up and a calibrationmethodology are suggested and employed for thiswork. The system is validated against pressure transducer and load cell measurements and for a range of waves breaking on a vertical seawall. For a large number (120 measurements for each case considered) of breaking and broken waves interacting with the wall, the peak pressure (Ppeak) profiles and the pressure distribution maps reported by the system agree wellwith results acquired using pressure transducers. Although the pressuremapping system tends to underestimate Ppeak, differences on themean of the 3, 5 and 10 highest Ppeak rangewithin±10%, while for themajority of the measurements the error on the integral of the acting pressures (the acting force compared with the force measured by the load cell) ranges within ±20%. It is concluded, that through careful calibration and set-up the pressure mapping system has the capacity to provide pressure distribution maps with a good accuracy. It is not, however, considered to constitute the absolute alternative to pressure transducers and thus a combined use is suggested for applications where a very high level of accuracy is required.Postprint (author's final draft

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Section: Pressure Transducers and Load Cellsmentioning

confidence: 99%

Measuring wave impact induced pressures with a pressure mapping system

Stagonas

Marzeddu

Gironella

et al. 2016

Coastal Engineering

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“…The force/pressure measurement systems were the same as those used by Marzeddu et al (2014), Marzeddu, Gironella, and Sánchez-Arcilla (2013) and Stagonas et al (2016). Marzeddu et al (2013) carried out tests with non-impulsive conditions to evaluate the capability of P8AP and Z6FC3 sensors to record repeatable loads. Results showed a satisfactory repeatability of the measured loads with a root mean square error of 5 N m -1 , compared to normal range value of 150 N m -1 (3%).…”

Section: Measurementsmentioning

confidence: 99%

“…However, the system could be amplified and sample up to 16 channels with a maximum sampling rate of 19.2 kHz. For experiments with pressure transducers, (Marzeddu et al, 2013, Journal of Hydraulic Research (2017 Wave impact measurements 5 2014) concluded that a satisfactory description of the pressure pulse can be obtained with a sampling frequency higher than 2.4 kHz. Table 1 summarizes wave characteristics at 3 m from the paddle for cnoidal and linear waves.…”

Section: Measurementsmentioning

confidence: 99%

Variability of wave impact measurements on vertical breakwaters

Marzeddu

Oliveira

Gironella

et al. 2017

Journal of Hydraulic Research

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The measurement of wave-induced impacts on structures involves significant scientific and engineering challenges. Regular nearly breaking pgbgand broken waves generated following cnoidal and first-order Stokes wavemaker theory have been considered to study the variability of wave impacts on vertical breakwaters. Four small-scale hydraulic experiments were carried out and repeated 120 times using high-speed pressure and force measurement equipment. High variability in the measured pressure field and total force were observed, reflecting the random nature of the studied phenomena. The force variability was similar for the nearly breaking and broken waves. The maximum measured force was between 166 and 177% of the minimum measured force. In relation to the force distribution and maximum pressure points, the observed variability is higher for broken waves. To deal with such variability in the observations, suitable probability distributions for forces (GEV) and pressures (Gamma) are proposed.

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“…There is a study that compares the wave forces acting on a vertical wall that were obtained from both the load cells and pressure transducers [13]. In that study, a single vertical plate was erected and the pressure transducers were plugged in the holes on the plate.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous measurement of wave forces and pressures on a double-chamber perforated caisson

2019

Meas. Sci. Technol.

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Accurate measurement of wave forces and pressures on coastal and offshore structures is extremely important for the evaluation of the structure stability against wave loading. This study introduced a hybrid measurement technique of using S-beam load cells and disc-type pressure transducers simultaneously. A novel instrumentation of tiny load cells together with pressure transducers were developed to measure the wave loading on a double-chamber perforated caisson. After carrying out experiments with great care, a detailed comparison is given between the directly measured forces and those estimated from the integration of the pressure records. Excellent agreement was observed between the wave forces that were obtained by the two methods, showing the index of agreement of 0.96 on average. Although this technique is very simple to apply, it has an advantage of measuring the wave force acting on the entire structure, while obtaining the forces and pressures on the individual components of the structure at the same time. Hence, this method can provide crucial information required for the design of coastal and marine structures having many elements, such as coastal bridges, refuge buildings against tsunamis, offshore platforms, as well as perforated caissons.

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Impulsive wave loads on rigid structures, an experimental approach

Cited by 5 publications

References 9 publications

Measuring wave impact induced pressures with a pressure mapping system

Measuring wave impact induced pressures with a pressure mapping system

Variability of wave impact measurements on vertical breakwaters

Simultaneous measurement of wave forces and pressures on a double-chamber perforated caisson

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