A full-scale resonant bending test system and modal analysis of steel catenary risers

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (20) : 119-127.

XU Zexin1，AN Chen1，XIE Zhi1，ZHANG Jixiang2，LIM Frank3

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Abstract

Steel Catenary Risers (SCRs) serve as essential components for supporting offshore platforms and other crucial equipment. Ensuring the structural integrity and safety of SCRs are paramount during prolonged operations in extreme marine environments. Conducting resonant bending fatigue tests on the risers has emerged as a requisite evaluation standard to guarantee their safe operation under harsh conditions, and it also forms the basis for subsequent predictions of fatigue life and analysis of failures. This study focused on deriving and solving the natural frequency and mode functions of the resonance system under different constraint conditions for two specific types of SCRs, and analyzes the effects of pipeline length, pipeline wall thickness, eccentric block and counterweight mass on the natural frequency of the resonance system. Subsequently, full-scale resonant bending fatigue tests were conducted under different specific operating conditions, and the vibration response characteristics of the SCRs with different spans and internal pressures in the full-scale resonant bending fatigue test system were simulated. The integration of theoretical analysis, finite element calculations and results from resonant fatigue tests revealed that the pipeline length and the counterweight constraints at both ends are critical parameters affecting the first-order natural frequency of the resonance system, especially the impact is particularly pronounced when the pipe length is short and the wall thickness is thin. Additionally, internal pressure and an increasing span will decrease the natural frequency of the resonance system, and a shorter support span will result in a higher natural frequency of the system. These analytical results provide an important reference basis for the structural design and optimization of the test plan of the resonant bending fatigue test system of SCR.

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steel catenary riser / resonant bending / fatigue testing / natural frequency / full-scale / modal characteristics

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XU Zexin1, AN Chen1, XIE Zhi1, ZHANG Jixiang2, LIM Frank3. A full-scale resonant bending test system and modal analysis of steel catenary risers[J]. Journal of Vibration and Shock, 2024, 43(20): 119-127

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