Optimization of grillage design for the transportation oof suction caisson jackets

Suction caisson jacket (SCJ) is one of the most promising substructures, under certain conditions, for offshore wind turbines. Their unique characteristic of large diameter (D) compared to their small wall thickness (t) conducts them an object of study, concerning their transportation to the offshore location, as their structural stability...

Material efficiency in timber high-rise buildings: A parametric study of externally braced timber stability systems considering the connection design

Timber high-rise buildings have been gaining in popularity. However, due to the low material stiffness of timber the stability systems of these buildings are often made with steel or concrete. To avoid this the material efficiency of the timber stability systems must be improved. The most material efficient stability systems for timber high-rise...

Timber High-Rise Buildings: Parametric study of the influence of preliminary design parameters on the wind-induced dynamic response of timber high-rise buildings

The implementation of timber as a load-bearing and stabilizing material for high-rise structures has significantly increased over the last decades due to its potential of reducing the environmental footprint of a structure. Timber structures present a reduced global stiffness and self-weight compared to structures incorporating traditional...

Reverse Engineering of existing reinforced concrete slab bridges

Most bridges in the Dutch infrastructure are built before 1985 and have experienced increasing traffic intensities and loads. On the other hand, the structural (design) codes have changed over the years. A frequently faced problem in practice is that the original design calculations and technical drawings of a large percentage of the existing...

Evaluation of the influential parameters contributing to the reconstruction of railway wheel defect signals

A wheel impact load detector is used to assess the condition of a railway wheel by measuring the dynamic forces generated by defects. This system normally measures the impact force at multiple points by exploiting multiple sensors to collect samples from different portions of the wheel circumference. The outputs of the sensors are used to...

Analysis of the Parametric Instability of the STC Combined Wind and Wave Energy Concept

Resonant motions of a combined wind and wave concept (STC) in waves may induce significant loads in the structural components (such as wind turbine blades, nacelle or the interface between the spar and the torus). One type of resonant motions is related to the so-called Mathieu instability. For the STC under the survival mode where the torus is...

Finite element modeling of non-rigid origami: Parametric study on bistable origami using the finite element method

Origami has become a source of inspiration in engineering for structural design and the creation of mechanical metamaterials. In the often used analytic geometric and energy methods, it is difficult to incorporate deformation of the faces in non-rigid origami. However, deformation of the faces can play a significant role in their mechanical...

Fatigue disbond growth in primary aerospace structures

A parametric finite element model incorporating virtual crack closure technique was developed in order to determine the critical disbond size and location for disbond growth in an adhesively bonded skin stiffened structure, subjected to uniaxial compression loading. The model was validated using static experimental tests on both pristine and...

Numerical Simulations of Spirally Welded Steel Tubes Under 4-Point Bending

This master thesis investigates the response of spirally welded steel tubes under 4-point bending deformation. Through the finite element simulations of a testing the buckling behavior of sprirally welded tubes can be more clearly understood. The numerical simulation and buckling behavior of spirally welded steel tubes is discussed in this...