Release Time:2019-07-01  Hits:

Indexed by: Journal Article

Date of Publication: 2019-01-01

Journal: PERIODICA POLYTECHNICA-CIVIL ENGINEERING

Included Journals: SCIE

Volume: 63

Issue: 2

Page Number: 550-561

ISSN: 0553-6626

Key Words: ice load; ice-induced vibration; numerical model; dynamic ice-structure interaction

Abstract: Sea ice crashing against offshore structures can cause strong ice-induced vibration and have a major impact on offshore structural safety and serviceability. This paper describes a numerical method for the prediction of ice-induced vibration when a vertical offshore structure is subjected to the impact of sea ice. In this approach, negative damping theory and fracture length theory are combined and, along with ice strength-stress rate curve and ice failure length, are coupled to model the internal fluctuating nature of ice load. Considering the elastic deformation of ice and the effect of non-simultaneous crushing failure of local contact between ice and structures, the present ice-induced vibration model is established, and the general features of the interaction process are captured. To verify its efficacy, the presented simulation methodology is subjected to a model test and two full-scale measurements based on referenced studies. Example calculations show good agreement with the results of the model test and full-scale measurements, which directly indicates the validity of the proposed simulation method. In addition, the numerical simulation method can be used in connection with FE programs to perform ice-induced vibration analysis of offshore structures.