Effects of state-of-the-art residual stress models on the member and local stability behaviour

Residual stresses have considerable effect on both the local and the member stability behaviour of steel structures. Previous studies have shown that the structural stability behaviour depends on both the distribution and the amplitude of the residual stresses. The residual stress distribution is affected by the cross-section geometry, the...

Ship collision on temporary structures: Combi-walls under collision loading

When designing a construction pit adjacent to a navigation channel, the event of a ship colliding with the structure is something to take into account in the design of the pit. However, several aspects regarding ship collisions, i.e. the probability of occurrence of a collision, the magnitude of the collision force and the influence on the...

Influence of various boundary conditions on local buckling of steel tubular piles: Effects of restraints, imperfections and residual stresses

The main focus of this thesis is the influence of different real boundary conditions on the failure mechanism of local buckling of steel tubular piles. The research was started with the theoretical method of describing boundary condition by specifying the degrees of freedom per boundary condition. The method makes use of the radial, meridional...

Local Buckling and Collapse of Thick-Walled pipe

Heerema Marine Contractors is an offshore contractor who specializes in the installation and removal of a range of offshore facilities. This includes the installation of submarine pipelines in excess of 1500 [m] water depth. Higher water depths drive the pipeline designs to increase wall thickness. Another motive to apply a low D/t ratio is to...

Local buckling of sand-filled steel tubes for combined walls

Bending behaviour of steel tubes has been examined in many research projects through the years, especially for empty ones. Also the infill and pressure effect in the tubes has been elaborately investigated but not much has been done on the effect that the sand infill has on the bending of the tubes. Combi-wall tubes are filled with sand during...

Investigation of buckling behaviour of pipe sections including simplified girthweld geometry with miss-alignment

Submarine pipeline is an important part of offshore oil and gas projects for fluid transmission purpose. Installation of pipelines, especially in deep water, can induce rather severe loads to the structure and this can lead to the unforeseeable risks and challenges. During pipe laying by vessel and reel ship, the pipe bend in the vertical plan...

Buckling optimization of steering stiffeners for grid-stiffened composite structures

Grid-stiffened composite structures, where the skin is stiffened by a lattice of stiffeners, not only allow for significant reduction in structural weight but are also competitive in terms of structural stability and damage tolerance compared with sandwich composite structures. As the development of Automated Fiber Placement (AFP) technology...

Tube-Cell combiwall

Quay walls are costly structures. The still growing sea transport market asks for more, bigger and more cost efficient quay walls. In this research, a new type of quay-wall is investigated: the ‘Tube-Cell Combi-Wall’. The Tube-Cell combi-wall consists of relative large diameter piles with flat sheet piles in between. The large diameter piles are...