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• W4205174941 abstract "Impulsive Pressure Of Breaking Wave On Piles K. Tanimoto; K. Tanimoto Ministry of Transport Search for other works by this author on: This Site Google Scholar S. Takahashi; S. Takahashi Ministry of Transport Search for other works by this author on: This Site Google Scholar T. Kaneko; T. Kaneko Kawasaki Steel Corporation Search for other works by this author on: This Site Google Scholar K. Shiota K. Shiota Kawasaki Steel Corporation Search for other works by this author on: This Site Google Scholar Paper presented at the Offshore South East Asia Show, Singapore, January 1986. Paper Number: SPE-14601-MS https://doi.org/10.2118/14601-MS Published: January 28 1986 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Tanimoto, K., Takahashi, S., Kaneko, T., and K. Shiota. Impulsive Pressure Of Breaking Wave On Piles. Paper presented at the Offshore South East Asia Show, Singapore, January 1986. doi: https://doi.org/10.2118/14601-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search nav search search input Search input auto suggest search filter All ContentAll ProceedingsSociety of Petroleum Engineers (SPE)SPE Offshore South East Asia Show Search Advanced Search AbstractCharacteristics of impulsive pressure on inclined circular piles exerted by a breaking wave were evaluated experimentally. The experiment wag conducted on a model pile, which was inclined from 0 to 30 on a 1:10 bottom slope. Time histories and distributions of the impulsive pressure were observed using ten pressure transducers on the pile surface.IntroductionWhen offshore structures are constructed in open ocean where wave action is severe, they should be designed to withstand the impact forces of breaking waves. The characteristics of the impact forces on these pile supported structures, however, have not yet been confirmed. Ross and Hall measured the total forces of breaking wave a acting on a vertical pile experimentally. Goda proposed a calculation model for the additional impact proposed a calculation model for the additional impact force based on an analogy to the virtual fluid mass of a flat plate. Recently, measured the impact forces at different heights above the still water level. All these technical papers, however, only treated the breaking wave forces acting on a vertical pile. Impulsive pressures acting on the pile surface have not yet pressures acting on the pile surface have not yet been investigated. We have been studying theoretically and experimentally the impulsive pressures on piles in order to establish a suitable design method. This paper presents experimental data on the impulsive pressures acting on inclined piles.EXPERIMENTAL FACILITIES AND PROCEDUREThe experiments were carried out in a 35m long, 1m wide and 0.94m deep wave tank. The bottom slope, i, was fixed at 1:10 with steel plates and a model. pile was installed 23m away from the wave generator. The model pile was 4.86cm diameter, 3.2mm thickness steel pipe and both sides were fixed as shown in Figure 1. The inclination of the pile, 0, was set at varying angles from 0 to 30. The pressure transducers P1 ~ P10 were 6mm diameter and 7kHz natural frequency. P1 ~ P8 were set in front of the pile. P9 and P10 were set in 45 and 90 direction from the front respectively. Two wave gauges were installed at the pile location and one-50cm seaward from it. The water depth at the pile, h, was maintained at 25cm and the wave period, T, was set at 1.5 and 2.0 seconds. In each case, the wave height was varied in seven stages near the breaking wave height Measured data were recorded with a tape speed 19 cm/s and digitized with sampling time of 2.5 × 10(-4)s for analysis.RESULTS OF THE EXPERIMENTSRelationship between Pressure and Wave HeightPm indicates the peak pressure induced by each wave and Pm is the average pm measured for six waves. Figure 2 shows the changes in Pm which were measured by pressure transducers in front of the pile (P1 ~ P8), with a relative wave height H'/h where 0 = 15, and T = 1.5s. In this case, H' is the assumed passing wave height which is represented by the breaking wave height rather than the height at the measuring point for the post-breaking wave. The breaking wave height at the measuring point Hb based on Goda's breaker indices is indicated by an arrow. When H' reaches Hb, impulsive pressure occurs at P3 which is located near the wave crest and Pm increases drastically. At this stage, Pm measured by P4 ~ P8 which are located under P3 is much smaller P4 ~ P8 which are located under P3 is much smaller than that of P3 since the impulsive pressure has not yet occurred. When H' increases further and just after the breaking wave collides with the pile, the impulsive pressure begins to act at the pressure transducers under P3 and the location of peak gradually decreases. In the case of H'/h = 1.3, the impulsive pressure can also be observed at P6 and P7 pressure can also be observed at P6 and P7 which are located below the still water level. The change in peak pressure with wave height which was shown in Figure 2 can be explained based on the breaking for. of a plunging breaker. In the first stage of wave breaking, the crest of wave spills forward and the velocity of the water surface becomes maximum in this portion, thereby causing the strong impulsive pressure to occur locally. In the next stage, the curved wave surface first collides with the pile, then the pressure at the center portion between wave crest and still water level, portion between wave crest and still water level, where the angle of wave surface is the same as the pile inclination, becomes a maximum. In last stage pile inclination, becomes a maximum. In last stage of wave breaking, the impulsive pressure occur near still water level since the wave crest collapses forward.Time History of Impulsive PressureFigure 3 shows the change in water level,, and wave pressure, p, with time, t where = 0. T = 1.5s and H'/h = 1.0 which is the nearly breaking condition. On P3 and P4 which are located in the portion where the wave front collides with the pile strongly, impulsive pressures are observed to be significant. On P7 and Pa pressures are observed to be significant. On P7 and Pa which are located below the still water level, time histories of pressure are similar to the water level change. Impulsive pressure was also observed at P9 which is at the same level with P4 and located in a direction of 45 from the pile front. The peak value, at this point, however, is much smaller than that at P4. At P10, which is in a direction of 90 from the pile front, the pressure increases slightly at the moment the wave crest passes and then negative pressure occurs. Figure 4 shows the time history of impulsive pressures in detail related to the fourth wave shown pressures in detail related to the fourth wave shown in figure 3. The interval of impulsive pressure occurrence between P3 and P4 is 0.028s. The increasing time interval of impulsive pressure in P4 is 0.001s and the interval of rising point between P4 and P9 is 0.0015s. When the impulsive pressure acts in a direction of 45 from front of the pile, then the pressure has already passed the peak value measured pressure has already passed the peak value measured at the pile front. In this figure, it can be seen that the impact force of breaking wave acting on the pile is caused by the impulsive pressure, which has pile is caused by the impulsive pressure, which has a very short rising time and acts locally. It moves at one moment in the direction of the pile axis and in a circumferential direction. Figure 5 shows the change in p with t in case of = 0 and T = 2.0s immediately after the breaking wave collides with the pile. The pulses of pressure are quite complex. Figure 6 shows the time history of impulsive pressures related to the first wave in Figure 5. Two pressures related to the first wave in Figure 5. Two peaks were observed at both P4 and P9. peaks were observed at both P4 and P9. Keywords: collide, maximum va ue, wave height, wave crest, model pile, time history, beach erosion board, water level, impact force, peak pressure This content is only available via PDF. 1986. Society of Petroleum Engineers You can access this article if you purchase or spend a download." @default.
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• W4205174941 title "IMPULSIVE PRESSURE OF BREAKING WAVE ON PILES" @default.
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