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Structural Engineering and Mechanics
  Volume 27, Number 1, September10 2007 , pages 33-48

Reliability of articulated tower joint against random base shear
Nazrul Islam and Suhail Ahmad

    An Articulated tower is one of the compliant offshore structures connected to the sea-bed through a universal joint which is the most vulnerable location of the tower that sustains the randomly fluctuating shear stresses. The time history response of the bottom hinge shear is obtained and presented in the spectral form. The fatigue and fracture reliability assessment of the tower joint against randomly varying shear stresses have been carried out. Non-linear limit state functions are derived in terms of important random variables using S-N curve and fracture mechanics approaches. Advanced First Order Reliability Method is used for reliability assessment. Sensitivity analysis shows the influence of various variables on the hinge safety. Fatigue life estimation has been made using probabilistic approach.
Key Words
    articulated; off-shore; SPM; random sea; reliability; fatigue; compliant.
Nazrul Islam: Civil Engineering Dept., Jamia Millia Islamia University, New Delhi-110025, India
Suhail Ahmad: Applied Mechanics Dept., Indian Institute of Technology, New Delhi-110016, India

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