Experimental study on the dynamic response of a marine riser in touchdown zone under lateral earthquake

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (18) : 132-137.

DAI Yunyun1,2，LI Zhigang1，FENG Xin2，LIU Shuai2,3，GUO Lingyun2，ZHOU Jing2

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Abstract

A set of experimental system for riser and seabed interaction was developed by using PVC pipeline and soft clay. Modal test and seismic test of the pipe-soil system on a large-sized shaking table were performed in this paper. The first three order frequencies and correspondent vibration mode shapes transversely were obtained from the modal test. Seismic response of some feature points along pipeline and pipe ring in touchdown zone and the adjacent surface zone and catenary zone was also observed. Results show the strain response of riser in surface zone was very small under lateral seismic excitation. The maximum strain response appeared in the touchdown zone of riser. Strain response of the riser in catenary zone was also severe, being another key part of the riser. In addition, dynamic response in lateral side of the pipeline is more severe than the top and bottom of the riser under lateral seismic excitation. Test results enrich the research on dynamic model test of the marine riser around touchdown zone, providing scientific basis for seismic design and safety assessment of riser in service.

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riser in touchdown zone / model test / earthquake / dynamic response

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DAI Yunyun1,2，LI Zhigang1，FENG Xin2，LIU Shuai2,3，GUO Lingyun2，ZHOU Jing2. Experimental study on the dynamic response of a marine riser in touchdown zone under lateral earthquake[J]. Journal of Vibration and Shock, 2020, 39(18): 132-137

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