Indexed by:期刊论文

Date of Publication:2018-01-01

Journal:EKOLOJI

Included Journals:SCIE

Volume:27

Issue:106

Page Number:2033-2043

ISSN No.:1300-1361

Key Words:flexible vertical structure; extreme static ice force; ice-resistant design; simultaneous destruction; non-simultaneous destruction; environmental conditions

Abstract:Deployment of wind turbine technology at offshore sites offers a promising but challenging solution due to the severe environmental conditions imposed by waves and currents. The key load of marine structures in the sub-Arctic environment is ice load. The critical factor that should be considered in the design of ice resistant marine structures is the extreme static ice force, which should be considered to ensure the structure has sufficient static strength and stiffness to prevent being pushed over by ice. With years of research and monitoring data on some prototype flexible vertical structures, we find that simultaneous destruction is more prone to occur on these structures, and the maximum static ice force is much larger than the force value by the formula of "Low Ice Force". To verify the rationality of designing flexible vertical structures in cold regions, in this paper, different extreme static ice force formulae from some building codes and research studies are analyzed, and some actual examples are presented to validate the results, so that the differences among these formulae will be shown. The prototype structure monitoring data is combined with the model test results of the Bohai Sea to verify the existence of simultaneous damage on flexible vertical structures. Based on the analysis of the monitoring data, the extreme ice load model of flexible vertical structures is proposed. This study provides a reasonable basis for ice-resistant design and security assurance of flexible vertical structures in the sub-Arctic environment.