Seismic response of jack-ups: An improved earthquake screening procedure using time history analysis

Jack-ups are used for offshore wind turbine installation (OWTI). To assess whether a jack-up can safely operate in a desired geographic location with known seismic activity, an earthquake response analysis is required for structural verification. This analysis is generally carried out according to the codes of the International Organization for...

Submerged Floating Tunnel: A structural response optimization of the transition structure subjected to earthquakes

This study presents the structural response of a Submerged Floating Tunnel (SFT) subjected to earthquake loading and other relevant static loading types. The SFT is a competitive solution for crossings of deep seas, canals and fjords, as it is submerged in water and floats at a fixed submersion depth. It is supported by its buoyancy and tethers,...

Submerged Floating Tunnel: Dynamic response due to earthquakes

The submerged floating tunnel (SFT) is a conceptual idea that originates from the 19th century. The idea consists of a tunnel tube floating underwater where it is kept at a fixed depth by its buoyancy and by tethers that are anchored to the seabed and or by floating pontoons at the water surface. The tunnel is placed deep enough to avoid extreme...

Development of clustering strategy to optimize the design of RNA and support structure in offshore wind farm under seismic conditions

Offshore wind energy is one of the emerging renewable technologies toward a zero-carbon emission society. Historically, offshore wind farms have been developed in the North Sea, but nowadays wind farms are expanded to other regions such as North America and Asia, which are seismic prone.<br/>In the design of Rotor-Nacelle-Assembly (RNA) and...

A comparison between the SLaMA method and NLFEA for 2D and 3D analyses of masonry structure

Each year, the province of Groningen experiences many induced earthquakes due gas extraction, which has been ongoing since 1963. The earthquakes cause damage to the buildings situated in the Groningen area, and they constitute a potential danger for the safety of the residents. These buildings are typically unreinforced masonry structures which...

Seismic Analysis of Cranes on Jack-Ups

GustoMSC, an NOV company, is a market leader in the design of offshore wind installation jack-ups. Offshore wind turbine installation has been situated mainly in the North Sea, which is not very seismically active. As a consequence, wind turbine installation jack-ups have been designed and analysed for low seismic excitations. The offshore wind...

Seismic analysis of monopile-based offshore wind turbines including aero-elasticity and soil-structure interaction

With the depletion of traditional energy sources, the usage of renewable energy alternatives has increased over the past years. Among them, wind energy is considered as one of the most economical and environmentally friendly alternatives, and is seen as one of the main sources of energy in the future. A very promising field in the area of wind...

Wavelet-based evolutionary response of multi-span structures including wave-passage and site-response effects

Stochastic seismic wavelet-based evolutionary response of multispan structures including wave-passage and site-response effects is formulated in this paper. A procedure to estimate site-compatible parameters of surface-to-bedrock frequency response function (FRF) by using finite-element analysis of the supporting soil medium is proposed. The...

Numerical modeling of dam-reservoir interaction seismic response using the Hybrid Frequency–Time Domain (HFTD) method

The research work studies the fundamentals of the Hybrid Frequency-Time Domain (HFTD) method for dynamic analysis of structures, applied to the seismic analysis of dam-reservoir interaction systems. The theoretical consistency and accuracy of the HFTD method, based on the frequency domain Fourier analysis, is demonstrated through all the parts...