Müller, Gerald and Wolters, Guido
Wellendruckschlagbelastungen auf historische Küstenbauwerke (Wave impact loads on historical coastal structures).
Die Küste, 68, .
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During the 19th and the early 20th Century, many coastal structures were built from block-work, i.e. large granite or concrete blocks. A large number of these structures are still in use. The continuous damage to blockwork structures, as well as a possible increase in wave loading due to increased storm activities, mean that coastal engineers occasionally have to develop repair and maintenance strategies or conduct risk assessments. The available information about this type of structures is however limited, and the interaction between waves and structure is not fully un-derstood. A number of observed cases of damage indicate that wave impact induced pressure pul-ses may propagate into water or air filled joints or cracks, generating high pressure fluctuations in-side of the structure. These pressures then push individual blocks out of their position into the sea. Several cases of damage to existing breakwaters illustrate this mechanism. Model tests showed that wave impacts can generate pressure pulses which then propagate into water and air filled cracks, whereby the speed of propagation increases with increasing crack width. Large scale tests and field measurements gave additional information about the characteristics of the pressure pulses. A si-milar damage mechanism is thought to be responsible for damage to sea dykes. photoelastic and numerical models of blockwork walls showed that the stress distribution inside of such a wall de-viates considerably from standard assumptions. The analysis of damage events and model tests showed that not only the stability but also the integrity of the structure should be considered for the risk-assessment of blockwork structures
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