Response of guyed offshore towers to stochastic loads in the presence of steady current

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1987

OSTI ID:7074060

Brynjolfsson, S

The validity of the widely used stochastic linearization method for analyzing the response of guyed towers to stochastic loads is investigated. The governing equations of a guyed tower have two main sources of nonlinearities, fluid-structure interaction and the restoring force of the cables. In this study, two models are considered. First, a linearized single degree of freedom (SDOF) model of a guyed tower is developed using the stochastic linearization approach. It is solved in the frequency domain, giving the statistical response of the guyed tower to random waves and earthquakes loading. The results are compared to the response statistics of a time simulation of a single degree of freedom system that fully incorporates the nonlinearities of the cable system and the fluid-structure interaction. Second, the dynamic response of a multiple degree of freedom (MDOF) model of a guyed offshore tower to stochastic earthquake loads and steady uniform current is investigated. The nonlinear cable stiffness and the fluid-structure interaction were again linearized using the stochastic linearization method. Numerical results for several load cases are presented and discussed.

• Research Organization: Oregon State Univ., Corvallis (USA)
• OSTI ID: 7074060
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
423000* -- Engineering-- Marine Engineering-- (1980-)
58 GEOSCIENCES
580200 -- Geophysics-- (-1989)
CURRENTS
DYNAMIC LOADS
EARTHQUAKES
MATHEMATICAL MODELS
MECHANICAL STRUCTURES
OFFSHORE OPERATIONS
SEISMIC EVENTS
SOIL-STRUCTURE INTERACTIONS
STOCHASTIC PROCESSES
TOWERS
WATER CURRENTS