Abstract
A slender cylindrical member is the fundamental component of many coastal and offshore structures. It is essential to understand the action of breaking waves on structural members since, when these members are subjected to wave impact load, the structural damages and failures may be catastrophic. In the present study, an experimental investigation has been carried out to measure the response of the slender vertical cylinder subjected to breaking wave impact. Pressure measurements were made in order to estimate the total force acting on the structure. An empirical relation is established between total impact force and the wave steepness parameter which dictates the intensity of the breaking. Pressure rise time is an important parameter dictating the impact event. Simultaneous acceleration and strain measurements were made to evaluate the response of the cylinder. Deflection has been derived from structure acceleration. The deflection due to the moderate plunging differs by two order more than severe plunging events. Strain rate is another important consideration for the impact loading. The higher strain rate increases the resistance of the material. Under the breaking wave impact on the cylinder, the strain rate varies from2 to 10−4.
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