Capacity of ice-strengthened structures subjected to different ice-loading scenarios

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Korgesaar, Mihkel
dc.contributor.advisor Suominen, Mikko
dc.contributor.author Ghosh Dastidar, Sabyasachi
dc.date.accessioned 2017-02-24T10:58:01Z
dc.date.available 2017-02-24T10:58:01Z
dc.date.issued 2017-02-20
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/24745
dc.description.abstract This thesis investigates the critical loading scenarios of multiple ice-strengthened ship structures when subjected to different load configurations. Evaluation of structural performance has been conducted using Non-linear Finite Element Analyses. Using a non-uniform pressure patch (NUPP), the capacity of ship structures was investigated and the safety margins against different capacity levels was determined. Results show that the point of yield and load for permanent deformation are highest for a structure built with IA Super ice class of the Finnish Swedish Ice Class Rules (FSICR). The values are observed to decrease for weaker ice classes. Although the present approach of FSICR is to design structures to yield once per winter, the safety factor against yield was about two for ice classes IA and IB, but slightly lower for IA Super. Comparison of different loading approaches, namely present design approach and non-uniform pressure patch, show that the FSICR approach yields much stiffer response. This justifies the use of less conservative NUPP for structural capacity evaluation, results of which show that the present FSICR design approach is extremely conservative. Alternatively, the current design pressure patch approach renders structures more safe than they actually are. Therefore, future investigations must clarify the pressure profile due to the ice loads. en
dc.format.extent 55+28
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.title Capacity of ice-strengthened structures subjected to different ice-loading scenarios en
dc.type G2 Pro gradu, diplomityö fi
dc.contributor.school Insinööritieteiden korkeakoulu fi
dc.subject.keyword winter navigation en
dc.subject.keyword Finnish-Swedish ice class rules en
dc.subject.keyword ice-strengthened structures en
dc.subject.keyword ice-loading scenarios en
dc.subject.keyword limit states en
dc.subject.keyword decreasing load function en
dc.identifier.urn URN:NBN:fi:aalto-201702242628
dc.programme.major Mechanical Engineering fi
dc.programme.mcode IA3027 fi
dc.type.ontasot Master's thesis en
dc.type.ontasot Diplomityö fi
dc.contributor.supervisor Romanoff, Jani
dc.programme Master’s Programme in Mechanical Engineering fi
dc.ethesisid Aalto 8200
dc.location P1


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