Wind and Structures

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Response of double hinged articulated tower platforms to wind forces

  • Islam, Nazrul (Department of Civil Engineering, Jamia Millia Islamia) ;
  • Zaheer, Mohd Moonis (Department of Civil Engineering, Jamia Millia Islamia) ;
  • Ahmed, Suhail (Department of Applied Mechanics, Indian Institute of Technology)
  • Received : 2008.03.28
  • Accepted : 2008.12.29
  • Published : 2009.03.25
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Abstract

Articulated tower platforms due to its compliant nature are more susceptible to the dynamic effects of wind than conventional fixed platforms. Dynamic response analysis of a double hinged articulated tower excited by low frequency wind forces with random waves is presented in this paper. The exposed super structure of the platform, housing the drilling and production facilities is subjected to mean and fluctuating wind loads, while the submerged portion is acted upon by wind driven waves. The fluctuating component of the wind velocity is modeled by Emil Simiu's spectrum, while the sea state is characterized by Pierson-Moskowitz spectrum. Nonlinearities in the system due to drag force, added mass, variable submergence and instantaneous tower orientation are considered in the analysis. To account for these nonlinearities, an implicit time integration scheme (Newmark's-${\beta}$) has been employed which solves the equation of motion in an iterative fashion and response time histories are obtained. The power spectra obtained from random response time histories show the significance of low frequency responses.

Keywords

References

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