A simplified methodology for dynamic responses of cross-decks of trimarans under slamming loads

ABSTRACT

The design principle of the hull structure is to ensure sufficient strength and avoid excessive waste of materials. The equivalent dynamic coefficients (EDC) possess the advantages of both static analysis and dynamic analysis in engineering. However, there is still no clear method for determining the EDC of a trimaran. In this work, the EDC of the cross-decks are chosen as the research objects. The EDC of the plate, longitudinal girders, and transverse frame of the cross-decks are calculated respectively. A method considering material nonlinearity and a method considering transverse bending moment (TBM) are proposed, and the effect of elastic-plastic material and TBM on EDC is presented. Results show that it is feasible to use the EDC to analyze the trimaran under slamming loads. Besides, the EDC of different parts of the trimaran is different, hence it is not recommended to use the fixed value given by the ABS rules.

KEYWORDS:

• Trimaran
• slamming
• dynamic response
• equivalent dynamic coefficient (EDC)
• yield strength

Disclosure statement

No potential conflict of interest was reported by the author(s).

Data availability statement

All data, models, or code generated or used during the study are available from the corresponding author by request.

Additional information

Funding

The authors acknowledge the financial support from the Shandong Provincial Natural Science Foundation, China [grant number ZR2020ME262]; and the Open Fund of State Key Laboratory of Coastal and Offshore Engineering, the Dalian University of Technology [grant number LP2001].