Faculté des Sciences appliquées
Faculté des Sciences appliquées

Master thesis : A consideration of the ISO12215 Structural Rules and the Classification Rules for a Vessel Close to 24m in Waterline length

Tivari, Ammar ULiège
Promotor(s) : Kaeding, Patrick ; Boccolini, Vittorio
Date of defense : 6-Sep-2022 • Permalink :
Title : Master thesis : A consideration of the ISO12215 Structural Rules and the Classification Rules for a Vessel Close to 24m in Waterline length
Author : Tivari, Ammar ULiège
Date of defense  : 6-Sep-2022
Advisor(s) : Kaeding, Patrick 
Boccolini, Vittorio 
Committee's member(s) : Boote, Dario 
Kaeding, Patrick 
Boccolini, Vittorio 
Language : English
Number of pages : 99
Keywords : [en] Rules and Regulations
[en] Scantling
[en] Composite boats
[en] Yachts
Discipline(s) : Engineering, computing & technology > Mechanical engineering
Target public : Researchers
Professionals of domain
General public
Institution(s) : Université de Liège, Liège, Belgique
Universität Rostock, Rostock, Allemagne
Solent University, Southampton, Royaume-Uni
Degree: Master : ingénieur civil mécanicien, à finalité spécialisée en "Advanced Ship Design"
Faculty: Master thesis of the Faculté des Sciences appliquées


[en] Yachts and other recreational crafts are a growing market. Depending on the length, these vessels are subject to different rules and regulations. For scantling of boats with a length smaller than 24 m, ISO 12215 Structural Rules are applied. Above this length, yachts are designed following Classification society rules. Scantling by structural regulations, stipulated by both ISO and Classification societies, has a common pathway.

A high-speed motorboat was selected to assess the for impact of slamming load and acceleration of gravity on the design. The assessment of minimum design loads, computed by ISO and Classification societies’ rules, is done by comparing the definition of design pressure, its longitudinal distribution, effect of gravity acceleration and effect of deadrise angle.

Afterwards, the scantling of a bottom plate is done by using the ISO and Classification societies’ rules. The material of the motorboat is composite, with a sandwich structure. Minimum requirements demanded by the rules are assessed. Limitation criteria stemming from breaking strain or ultimate stress are evaluated parallelly with core check for shear.

Finally, the results are compared, with the purpose of verifying if there is a natural structural continuity between a 24m yacht designed with ISO and with another designed with Classification society; plating should be similar and there should not be and big jump in laminate thickness and strength requirements, which was not the case. The inconsistencies between the results were analysed.



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  • Tivari, Ammar ULiège Université de Liège > Master ing. civ. méc. (EMSHIP+)


Committee's member(s)

  • Boote, Dario Unige
  • Kaeding, Patrick UNI Rostock
  • Boccolini, Vittorio Solent
  • Total number of views 70
  • Total number of downloads 679

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