Stochastic seismic analysis of yielding offshore towers
An analytical procedure to determine the stochastic response of inelastic offshore towers to a nonstationary ground motion in a semiclosed form is described. The method is approximate, but the solution is obtained without recourse to time-consuming Monte Carlo solution generation techniques. The offshore tower is modeled as a lumped-mass system and the resisting forces are obtained as a combination of linear and hysteretic forces. A filtered shot noise process is used to represent earthquake ground motion. Nonlinear hydrodynamic drag forces and the structure-resisting hysteretic forces are replaced by appropriate linear forms by using the equivalent linearization technique. The system response is then immediately obtained from the Kolmogorov-Fokker-Planck equation for the linearized structure system as the solutions of a nonlinear first-order matrix differential equation. To confirm the validity of the method, an example problem is solved using this method and the Monte Carlo solution technique.
- OSTI ID:
- 6862140
- Journal Information:
- J. Eng. Mech. Div., Am. Soc. Civ. Eng.; (United States), Journal Name: J. Eng. Mech. Div., Am. Soc. Civ. Eng.; (United States) Vol. 100:EM5; ISSN JMCEA
- Country of Publication:
- United States
- Language:
- English
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