Numerical study of monopile offshore foundation dynamic behaviour using coupled simulation

2019 ◽  
Vol 172 (8) ◽  
pp. 580-589 ◽  
Author(s):  
Mohammad Reza Shah Mohammadi ◽  
Hélder D. Craveiro ◽  
Carlos Rebelo
Keyword(s):  
Dynamic Behaviour ◽  
Numerical Study ◽  
Coupled Simulation ◽  
Offshore Foundation

Nonlinear dynamic behaviour of guy cables in turbulent winds

2001 ◽  
Vol 28 (1) ◽  
pp. 98-110 ◽  
Author(s):  
Bruce F Sparling ◽  
Alan G Davenport
Keyword(s):  
Finite Element ◽  
Dynamic Behaviour ◽  
Aerodynamic Drag ◽  
Numerical Study ◽  
Horizontal Displacement ◽  
Wind Loading ◽  
Second Phase ◽  
Nonlinear Coupling ◽  
Wide Range ◽  
Cable Vibrations

Large amplitude cable vibrations are difficult to predict using linear theory due to the presence of sag in the suspended profile. A numerical study was therefore undertaken to investigate the dynamic behaviour of inclined cables excited by imposed displacements. To model the nonlinear nature of cable response, a time domain finite element approach was adopted using nonlinear catenary cable elements. Two types of horizontal displacement patterns were enforced at the upper end of the guy. In the first phase of the study, harmonic displacement histories with a wide range of forcing frequencies were considered. In the second phase, random enforced displacements were used to simulate the motion of a guyed mast in gusty winds. The influence of aerodynamic drag and damping forces was investigated by performing analyses under still air, steady wind, and turbulent wind conditions. It was found that nonlinear coupling of related harmonic response components was significant at certain critical frequencies, particular when the excitation was harmonic and acted in the plane of the guy. Positive aerodynamic damping was shown to effectively suppress resonant and nonlinear coupling response.Key words: cables, structural dynamics, wind loading, finite element method, nonlinear analysis, guyed towers.

scholarly journals Numerical study on the influence of acoustic natural frequencies on the dynamic behaviour of submerged and confined disk-like structures

2017 ◽  
Vol 73 ◽  
pp. 53-69 ◽  
Author(s):  
Matias Bossio ◽  
David Valentín ◽  
Alexandre Presas ◽  
David Ramos Martin ◽  
Eduard Egusquiza ◽  
...  
Keyword(s):  
Dynamic Behaviour ◽  
Natural Frequencies ◽  
Numerical Study

A numerical study on the influences of underlying soil and backfill characteristics on the dynamic behaviour of typical integral bridges

Bauingenieur ◽  
2020 ◽  
Vol 95 (11) ◽  
pp. S 2-S 11
Author(s):  
H. D. B. Aji ◽  
M. B. Basnet ◽  
Frank Wuttke
Keyword(s):  
Soil Structure ◽  
Dynamic Behaviour ◽  
Numerical Study ◽  
Coupled System ◽  
Soil Structure Interaction ◽  
Dynamic Resistance ◽  
Soil Characteristic ◽  
Structure Interaction ◽  
Integral Bridges ◽  
Underlying Soil

Abstract The identification of the dynamic behaviour of a structure is one of the crucial steps in the design of the dynamic resistance of the structure. The dynamic behaviour is represented by the natural frequencies and damping which are subsequently used along with the considered dynamic actions in the design process. In regard of integral bridge concept, one of the consequences of the omission of joints and bearings is the substantial soil-structure interaction which in turn increases the sensitivity of the dynamic behaviour of the bridges to the surrounding soil characteristic. In this article, we extended our hybrid BEM-FEM steady-state dynamic numerical tool to the 3D regime, developed by utilizing an in-house BEM and the commercial FEM software ABAQUS and use it to analyse the dynamic interaction between the bridge and the underlying soil as well as the backfill. The numerical results from four typical integral bridges show that underlying soil characteristic has great effect on the resonant frequencies and the damping. The backfill material properties tend to have less significant role due to the abutment wingwalls dominating the force transfer between the soil and the superstructure. The results also show that the degree of influence of the soil-structure interaction on the coupled system is affected by the type of load pattern in addition to the flexural stiffness of the superstructure.

Numerical Study of Dynamic Crack of 1D Hexagonal and 3D Icosahedral Quasicrystals

2013 ◽  
Vol 734-737 ◽  
pp. 2306-2309
Author(s):  
Li Ping Du ◽  
Xiu Juan Xu ◽  
Yi Li Tan
Keyword(s):  
Stress Intensity Factor ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Dynamic Stress ◽  
Dynamic Behaviour ◽  
Numerical Study ◽  
Dynamic Stress Intensity Factor ◽  
Dynamic Equations ◽  
Dynamic Crack ◽  
Icosahedral Quasicrystals

According to a new version of equations of elasodynamics of quasicrystals suggested by Ref, a finite difference method of the anti-plane elastic dynamic equations of 1D hexagonal and 3D icosahedral quasicrystals is developed. Further the dynamic behaviour of the material with a model III crack under impact loading is given.The results show dynamic stress intensity factor of the crack tip, in which the similar and different features with conventional materials are discussed, especially the phonon,phason and phonon-phason coupling effects are explored.

Influence of Urban Canopy Layer on a heavy rainfall over Beijing

2020 ◽  
Author(s):  
minjin ma
Keyword(s):  
Heat Source ◽  
Urban Area ◽  
Heavy Rainfall ◽  
Numerical Study ◽  
Regional Scale ◽  
Urban Canopy ◽  
Anthropogenic Heat ◽  
Coupled Simulation ◽  
Canopy Layer ◽  
Urban Canopy Layer

<p>Urban canopy layer (UCL) is generally considered in numerical study of urban meteorology. The weather research and forecasting Model (WRF) coupled with urban canopy layer scheme is used to simulate a heavy rainfall case in Beijing. Comparative analysis is applied for the case between coupled simulation and non coupled simulation and therefore exhibits the effect of the UCL on the rainfall. Sensitive experiments are performed to investigate anthropogenic heat source and urban area extension to affect the precipitation. The results show that the coupled UCL model has captured the rainfall characteristics at the regional scale. The coupled simulation has improved accuracy of the rainfall area, the peak value and the rainfall duration compared to the non coupled simulation. The main effect achieves as longer duriation of the ascending motions and enhancement of the layers unstabilities. Although the intensity of the vertical motion has a little reduction, the time of the motion has increased 2 hours in a day. Sensitive experiments present an obvious influence on precipitation intensity, precipitation centralization and heat island effect. The precipitation center moves toward the urban center, the accumulated rainfall increases 78.5 mm and the center moves by distance 13 km when anthropogenic heat source is perturbed to double. Urban area extension induces increase of the precipitation area and intensity due to high humidity and ascending motion. The experment also reveals shift of the island heat effect.</p>

scholarly journals A Numerical Assessment on the Influences of Material Toughness on the Crashworthiness of a Composite Fuselage Barrel

2020 ◽  
Vol 10 (6) ◽  
pp. 2019
Author(s):  
A. Riccio ◽  
S. Saputo ◽  
A. Sellitto ◽  
F. Di Caprio
Keyword(s):  
Fracture Energy ◽  
Damage Evolution ◽  
Dynamic Behaviour ◽  
Numerical Study ◽  
Rigid Surface ◽  
Impact Deformation ◽  
Numerical Assessment ◽  
Laminar Fracture ◽  
Material Fracture ◽  
The Impact

In the present work, a numerical study on the dynamic response of a composite fuselage barrel, in relation to crashworthiness, has been investigated. The aim of this work is to investigate the influence of the material fracture toughness on the capability of a composite fuselage barrel to tolerate an impact on a rigid surface. Three different material configurations with different intra-laminar fracture energy values were considered to take into account variations in material toughness. Indeed, the dynamic behaviour of the analysed fuselage barrel has been numerically simulated by means of the FE (Finite Element) code Abaqus/Explicit. The effects of intralaminar fracture energy variations on the impact deformation of the barrel has been evaluated comparing the numerical results in terms of displacements and damage evolution for the three analysed material configurations.

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