A procedure for predicting the fatigue damage of structural members in unsteady winds
- Massachusetts Inst. of Tech., Cambridge, MA (United States)
The practice of assuming full, steady state, vortex-induced-vibration response, to wind is excessively conservative. This paper presents a practical method for estimating the reduction of the fatigue damage rate due to the natural unsteady fluctuations in wind speed. Two dimensionless parameters are shown to be particularly important. The first is the ratio of the lock-in bandwidth to the turbulence intensity level of the wind. The second is the ratio of the length of time the wind speed remains in the lock-in interval to the rise time of the member to steady state response levels. The paper also shows that one must account for the discrete nature of wind speed and direction scatter diagrams in estimating the probability of occurrence of the critical wind speed.
- Sponsoring Organization:
- American Petroleum Inst., Washington, DC (United States)
- OSTI ID:
- 433940
- Report Number(s):
- CONF-960525-; TRN: IM9709%%374
- Resource Relation:
- Conference: 28. offshore technology conference, Houston, TX (United States), 6-9 May 1996; Other Information: PBD: 1996; Related Information: Is Part Of 28. annual offshore technology conference: Proceedings. Volume 2: Platform and marine system design; PB: 947 p.
- Country of Publication:
- United States
- Language:
- English
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