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Prediction of long-term extreme load effects due to wind for cable-supported bridges using time-domain simulations

Xu, Yuwang; Øiseth, Ole; Næss, Arvid; Moan, Torgeir
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Prediction+of+long-term+extreme+load+effects+due+to+wind+for+cable-supported+bridges+using+time-domain+simulations.pdf (2.622Mb)
URI
http://hdl.handle.net/11250/2462212
Date
2017
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  • Institutt for konstruksjonsteknikk [2628]
  • Institutt for marin teknikk [3634]
  • Institutt for matematiske fag [2675]
  • Publikasjoner fra CRIStin - NTNU [41881]
Original version
Engineering structures. 2017, 148 239-253.   10.1016/j.engstruct.2017.06.051
Abstract
Many long-span bridges that are slender and susceptible to wind-induced vibrations are currently under construction all over the world. As nonlinear structural behavior and nonlinear displacement-dependent wind loads become of higher importance, time-domain methods are commonly applied instead of frequency-domain approaches. This paper discusses how rational functions, fitted to aerodynamic derivatives, can be converted to a state-space model to transform the frequency-dependent aerodynamic forces into the time domain. A user element has been implemented in ABAQUS to include the self-excited forces in the dynamic analysis. The flutter stability limit and buffeting response of the Hardanger Bridge have been calculated in a comprehensive case study to illustrate the performance of the presented methodology. The Average Conditional Exceedance Rate method is used to estimate long-term extreme load effects. A simplified full long-term method that ignores wind velocities which contribute little to the long-term extreme values is introduced to reduce the required computational effort. The long-term predictions are also compared with results obtained using a short-term approach and it is concluded that the long-term extreme load effects are approximately 14% higher than the short-term extreme values.
Publisher
Elsevier
Journal
Engineering structures

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