research within the coastal highway route e39 project ... uis structural durability assessment and...
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University of Stavanger
uis.no
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Jasna Bogunović Jakobsen
23.10.2017
http://nn.wikipedia.org/wiki/Uburen#mediaviewer/File:Lysefjordbroen_sett_fra_Sokkanuten.jpg
Research within the Coastal Highway Route E39 project
University of Stavanger
Project supported by NPRA (2014-2019) :
Wind-induced vibrations of long span bridges Motivation:
Safe and cost effective bridge design based on imporved modellingof wind- (and wave)-induced bridge vibrations in complex terrain.
Integrated approach:
Full-scale wind and wind action effects observations.
Dedicated wind tunnel investigations.
Measurement data analysis.
Structural modelling.
Simulation of wind/environmental actions and structuralresponse.
Design criteria
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Research team
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Title and name Financed by Focus on
Prof. J.B.Jakobsen UiS Overall research work management, detailed
planning , measurements, supervision…
Σ expertise based on 55-60 years experience in wind
engineering
Prof. II J.T. Snæbjörnsson NPRA
Postdoc Etienne Cheynet NPRA, since 2016
(UiS PhD, 2016)
Analysis of the full scale measurement data /
Turbulence modelling and simulations /Structural
response analysis in frequency domain
Postdoc Jungao Wang NPRA, since 2016 Finite element structural modelling
Wind and wave load and response analysis in time-
domain / Bridge cable aerodynamics
Dr. Heidi Christiansen UiS PhD, 2016 Bridge cable aerodynamics
PhD student NN UiS Bridge aerodynamics /Fluid-structure interaction
PhD student NN supervised
by Ass. Prof. S. Samarkoon
UiS Structural durability assessment and control of
reinforced concrete constructions: impact of cracks
due to different loading conditions
Pilot investigation on the application of lidars for wind
characterisation in bridge engineering
A Wind measurements around/from an
exisitng bridge - Lysefjord Bridge study
Long range lidar WindCube100S (with UiB and CMR)
Investigation of the overall wind field accross the
fjord
Short range WindScanner system (with DTU, CMR)
Small scale turbulence investigation
upstream and downstream from the bridge deck
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Non-scanning, fixed line-of-sight, measurements:Example of a LOS data by WindCube100S,
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Radial wind velocity recorded by a LOS scan elev=1.8°
azim=39°; 22.05.2014 starting at 16:12:06
B Bjørnafjorden lidar measurements
Bridge in the planning phase !+ 4-5 km wide fjord !
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Lidar and sonic anemometer wind velocity data
comparison
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The along-beam wind velocity data recorded by the lidar Koshava (r = 2248m)
and the anemometers at Ospøya II from 2016-06-24 to 2016-06-28.
Mean value (left) and STD (right) of the
along-beam wind velocity recorded by
the lidar
koshava and the anemometer at
Ospøya II from 2016-06-24 and 2016-
06-28.
Bjørnafjorden lidar measurements
Turbulence intensities recorded
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Cheynet, E., Jakobsen, J.B., Snæbjörnsson, J., Mann, J., Courtney, M., Lea, G. and Svardal, B. (2017),
Measurements of Surface-Layer Turbulence in a Wide Norwegian Fjord Using Synchronized Long-Range
Doppler Wind Lidars, Remote Sensing 9.10: 977.
Poster with more information
=>Basis for C longer NPRA
campaigns at Sulafjorden and
Halsafjorden
=>Comparison between the
wind measurements above the
sea surface and those
acquired from the met masts
on land
Application of lidar
measurements in bridge
engineering presented
on forskning.no
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Wind-induced response of bridges in complex terrain
Complementary approaches to the improved estimation: Full-scale measurements of turbulence
Turbulence modelling / relation to MABL modelling
Simulation of turbulence
Finite element structural modelling
Full-scale observatioins of structural behavior /System identification
Bridge cable vibrations / novel design of stay cable surface
Wave load simulation
Response analysis in frequency and time-domain
Reliability analysis
Broader research environment
Internationial and national collaboration
Collaboration with NPRA
Offshore / marine / CFD group at UiS
Offshore wind energy research (MABL charaterization etc..)
Master students …
..
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Suspension bridge with towers on floating supports Coupled aero-hydrodynamic analysis
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TABLE 4 – Summary of the aerodynamic and hydrodynamic loads for the floating bridge.
Aerodynamic
actions Wind
Quasi-steady buffeting theory;
considering non-linear and coupling terms
Hydrodynamic
actions
Wave
Excitation
force: First order wave excitation force
Radiation
force:
Added mass and damping force
Other
force: Mean drift force
Current TLPs: Mean force
Tethers: Morrison equation with non-linear terms
t
0
-
f(t)=A x(t)+ h(t-τ)x(τ)dτ
2h(τ)= c(ω)cos(ωt)dω
π
t
0
-
f(t)=A x(t)+ h(t-τ)x(τ)dτ
2h(τ)= c(ω)cos(ωt)dω
π
* Second order wave load (sum and difference frequency components to be implemented).
✓ Validation with
full-scale measurement
✓ Validation with
DNV SIMA
FEM + user defined subroutine (in time-domain)
Comprehensive wind-wave load and response simulation
for a bridge with towers on floating supports
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100 years wind and wave conditions; different wave conditions at the two supports
Case study – coupling effect
13Lateral displacement Vertical displacement Torsional displacement
PhD seminar at Sola Strand hotel, June 2017
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Summary
Coastal Highway Route E39 project connects well to theongoing work and triggers further reserach in wind engineeringat UiS.
The research covers the entire spectrum of studies, from thosedevoted to the fundamental understanding of turbulence and the wind load generation mechanism, model-scale and full-scale experimental investigations of loads and bridge dynamicbehaviour, to numerical simulations of load effects on considered E39 bridge designs.
Lot more to investigate and achieve by continuing the researchof high relevance, quality and significant novelty!
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