A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
A CFD STUDY ON THE STRUCTURAL RESPONSE OF A SLOPING TOP CAISSON SUBJECT TO WAVE OVERTOPPING
Vertical breakwaters are frequently employed for the protection of harbors in many areas around the world. Their success is due to the fact that they represent, especially in relatively deep water, a better alternative in terms of performances, construction speed, and maintenance costs compared to traditional rubble mound breakwaters. However, they have suffered in the past from severe damage caused by storms, which have led, in some cases, to catastrophic failures. In such seas, where the large wave heights generate tremendous wave forces acting on the breakwaters, a monolithic structure expressly designed to face rough seas is the so-called sloping top caisson. A sloping top caisson has a superstructure that is sloped to reduce the wave forces, i.e., the downward forces on the slope cancel the uplift pressure, thereby reducing the wave pressure on the upright wall. Although this approach may seem rational, Walkden el al., (2001) warned that, while decreasing the landward thrust, a large amount of overtopping may cause strong seaward directed impulsive loadings. During an extremely small set of physical experiments (3 tests only) conducted on a small scale model of a Hanstholm type breakwater, the authors measured rear pressure peaks so intense to lead to a seaward sliding force 40 percent larger than the landward one. In this study, the role of air contribution was significantly highlighted. After that pioneering study, however, the nature of the overtopping generated impacts has surprisingly not deepened further. Despite sloping top breakwater has long been used in the engineering practice (the first was constructed in Naples, Italy, in 1906), detailed reports on their structural response are very few. In 1994, Takahashi et al. proposed a prediction method to calculate wave force under the crest phase, which modifies the well-known Goda formula for vertical walls. The method is based on few regular wave experiments and, at the author knowledge, has been not further verified. The present thesis discusses main ...
A CFD STUDY ON THE STRUCTURAL RESPONSE OF A SLOPING TOP CAISSON SUBJECT TO WAVE OVERTOPPING
Vertical breakwaters are frequently employed for the protection of harbors in many areas around the world. Their success is due to the fact that they represent, especially in relatively deep water, a better alternative in terms of performances, construction speed, and maintenance costs compared to traditional rubble mound breakwaters. However, they have suffered in the past from severe damage caused by storms, which have led, in some cases, to catastrophic failures. In such seas, where the large wave heights generate tremendous wave forces acting on the breakwaters, a monolithic structure expressly designed to face rough seas is the so-called sloping top caisson. A sloping top caisson has a superstructure that is sloped to reduce the wave forces, i.e., the downward forces on the slope cancel the uplift pressure, thereby reducing the wave pressure on the upright wall. Although this approach may seem rational, Walkden el al., (2001) warned that, while decreasing the landward thrust, a large amount of overtopping may cause strong seaward directed impulsive loadings. During an extremely small set of physical experiments (3 tests only) conducted on a small scale model of a Hanstholm type breakwater, the authors measured rear pressure peaks so intense to lead to a seaward sliding force 40 percent larger than the landward one. In this study, the role of air contribution was significantly highlighted. After that pioneering study, however, the nature of the overtopping generated impacts has surprisingly not deepened further. Despite sloping top breakwater has long been used in the engineering practice (the first was constructed in Naples, Italy, in 1906), detailed reports on their structural response are very few. In 1994, Takahashi et al. proposed a prediction method to calculate wave force under the crest phase, which modifies the well-known Goda formula for vertical walls. The method is based on few regular wave experiments and, at the author knowledge, has been not further verified. The present thesis discusses main ...
A CFD STUDY ON THE STRUCTURAL RESPONSE OF A SLOPING TOP CAISSON SUBJECT TO WAVE OVERTOPPING
Daliri, Mohammad (author)
2017-12-09
Daliri, Mohammad (2017) A CFD STUDY ON THE STRUCTURAL RESPONSE OF A SLOPING TOP CAISSON SUBJECT TO WAVE OVERTOPPING. [Tesi di dottorato]
Theses
Electronic Resource
English
3-D wave overtopping on caisson breakwaters
| British Library Conference Proceedings | 1995
Hydraulic Characteristics of a Sloping Top Caisson - Wave forces acting on the sloping top caisson -
| British Library Conference Proceedings | 1994
A Comparative Study on Wave Forces and Overtopping of Caisson Breakwaters
| British Library Conference Proceedings | 1994
Impulsive seaward loads induced by wave overtopping on caisson breakwaters
| British Library Online Contents | 2001