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Experiment study on dynamic characteristics of free spanning submarine pipelines due to earthquake

ZHOU Jing 1, LI Xin 1, MA Heng chun 1, ZHU Tong 1 (1 The State Laboratory of Coastal and Offshore Engineering, Dalian University of Technology,Dalian 110624,China)  
Submarine pipelines constructed in seismically active regions may be damaged under seismic load. Dynamic response for free spanning submarine pipelines due to earthquake was studied by use of an underwater shaking table. The influencing factors such as seismic wave direction, support conditions at pipeline ends, distance from the seabed, span and pipes with or without water inside were considered in the experiment. Tests on 120 groups of different combinations of the above factors were carried out. The results show the seismic response of submarine pipelines is obviously different from of the terrestrial pipelines. The span and horizontally seismic input is the key to control pipeline response. The response of free spanning pipeline due to earthquake also differs from that due to affects of wave and current.
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