Research within the Coastal Highway Route E39 project. University of Stavanger

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1 Research within the Coastal Highway Route E39 project University of Stavanger University of Stavanger uis.no Jasna Bogunović Jakobsen

2 Project supported by NPRA ( ) : Wind-induced vibrations of long span bridges Motivation: Safe and cost effective bridge design based on imporved modelling of 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 structural response. Design criteria. 2

3 Research team Title and name Financed by Focus on Prof. J.B.Jakobsen Prof. II J.T. Snæbjörnsson UiS NPRA Overall research work management, detailed planning, measurements, supervision Σ expertise based on years experience in wind engineering 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 timedomain / 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 3 due to different loading conditions

4 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 4

5 Non-scanning, fixed line-of-sight, measurements: Example of a LOS data by WindCube100S, Radial wind velocity recorded by a LOS scan elev=1.8 azim=39 ; starting at 16:12:06 5

6 B Bjørnafjorden lidar measurements Bridge in the planning phase!+ 4-5 km wide fjord! [1]6

7 Lidar and sonic anemometer wind velocity data comparison The along-beam wind velocity data recorded by the lidar Koshava (r = 2248m) and the anemometers at Ospøya II from to Mean value (left) and STD (right) of the along-beam wind velocity recorded by the lidar koshava and the anemometer at Ospøya II from and

8 Bjørnafjorden lidar measurements Turbulence intensities recorded =>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 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 8

9 Application of lidar measurements in bridge engineering presented on forskning.no 9

10 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.. 10

11 Suspension bridge with towers on floating supports Coupled aero-hydrodynamic analysis FEM + user defined subroutine (in time-domain) TABLE 4 Summary of the aerodynamic and hydrodynamic loads for the floating bridge. Aerodynamic actions Hydrodynamic actions Wind Wave Current Quasi-steady buffeting theory; considering non-linear and coupling terms Excitation First order wave excitation force force: Radiation force: Other force: TLPs: Tethers: Added mass and damping force f(t)=a x(t)+ 2 Mean drift force Mean force t 0 h(t-τ)x(τ)dτ 2 h(τ)= π - Morrison equation with non-linear terms * Second order wave load (sum and difference frequency components to be implemented). Validation with full-scale measurement 0 c(ω)cos(ωt)dω Validation with DNV SIMA 11

12 Comprehensive wind-wave load and response simulation for a bridge with towers on floating supports 100 years wind and wave conditions; different wave conditions at the two supports 12

13 Case study coupling effect 13 Lateral displacement Vertical displacement Torsional displacement

14 PhD seminar at Sola Strand hotel, June

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16 Summary Coastal Highway Route E39 project connects well to the ongoing work and triggers further reserach in wind engineering at UiS. The research covers the entire spectrum of studies, from those devoted to the fundamental understanding of turbulence and the wind load generation mechanism, model-scale and fullscale experimental investigations of loads and bridge dynamic behaviour, to numerical simulations of load effects on considered E39 bridge designs. Lot more to investigate and achieve by continuing the research of high relevance, quality and significant novelty! 16