Reliable estimation of offshore structural response due to random wave loading is essential for ensuring safe and economical designs. However, the conventional Monte Carlo time simulation method requires the simulation of an extremely large number of response records in order to derive extreme response probability distributions with acceptably low sampling variability. The Efficient Threshold Upcrossing (ETU) method, presented in this paper, enables rapid calculation of these probability distributions by using information about threshold upcrossing rates in conjunction with an Efficient Time Simulation (ETS) technique. Extreme response probability distributions from this novel technique are compared with those from the conventional and the ETS methods using a simple structural model exposed to Morison wave loading. It is shown that the method allows a very efficient calculation of response statistics.
Efficient Estimation of Offshore Structural Response Based on Threshold Upcrossing Rates
Lambert, LA, Najafian, G, Cooper, JE, Abu Husain, M, & Mohd Zaki, NI. "Efficient Estimation of Offshore Structural Response Based on Threshold Upcrossing Rates." Proceedings of the ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. Volume 2A: Structures, Safety and Reliability. Nantes, France. June 9–14, 2013. V02AT02A033. ASME. https://doi.org/10.1115/OMAE2013-10385
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