## Scientific project: Warping and distortion of thin-walled sections

**Project code**
023-0231744-3010

**Project name** Warping and distortion of thin-walled sections

**Senior researcher**
Radoslav Pavazza

**Institution of employment** University of Split, Faculty of Electrical Engineering, Mechanical Engineering a...

**Program name** Modelling and Optimisation of new materials and structures

**Scientific area** technical science

**Peer review group** Mechanical Engineering;Shipbuilding;Traffic Technology and Transportation;Aeronautics and Space Technology

**Summary** The classical theories of thin-walled beams (Timoshenko, Vlasov) are
based on the assumption that the cross-section shape is maintained
during deformations. Owing to this assumption, the stress analysis
becomes relatively simple, both in the beam bending and torsion, and
with this way acceptable for the engineering practice. The assumption,
meanwhile, presumes a cross-section that has a sufficient stiffness with
respect to the shape distortion, or a load distribution in the
transverse direction so that distortion can be neglected. In practice,
these changes are usually small and can be ignored.
Meanwhile, in the case of extremely thin-walled structures, these
changes may have significant influences on the stress distribution. In
the case of bending, the cross-section warping can be taken into
account, in a relatively simple way, in the calculations of
displacements; in the case of stress calculations, the cross-section
warping is usually ignored. In the case of torsion, the cross-section
warping is a part of the theory of torsion. Warping due to shear,
related to the relatively short beams, is the subject of newer
investigations.
The goal of this investigation is to improve the theories of bending and
torsion by taking into account warping and distortion of the
cross-sections. The solutions related to modelling of light thin-walled
structures will be considered. The intention is to determine a
thin-walled beam as a finite element, to model thin-walled structures,
such as marine and civil structures, in a relatively simple way. The
problem of the cross-section asymmetry will be considered. Expressions
for strength and stability of the elements of plated structures will be
considered, particularly with respect to the cross-section asymmetry.
The results of the investigation, which will be given in the analytical,
parametric form, will be checked by using modern numerical methods, as
well as by experimental methods. The results will be compared with
recent investigations in the field, published in recognised
international scientific journals.
The investigation should be able to give standards for the calculation
of thin-walled structures, such as marine and civil plated structures.
The project will investigate possible application of obtained solutions
in reliability analysis of existing structures, by well known
probability approaches. In the application of the results of the
investigation, cooperation with Croatian Register of Shipping.

**Key words** |thin-walled cross sections|warping,distortion

**Contract from** 2.1.2007

**Croatian scientific bibliography **http://bib.irb.hr/lista-radova?sif_proj=023-0231744-3010&print=true&lang=EN

Address for communication | |
---|---|

Name and surname | Radoslav Pavazza |

Street and no. | Put Sv. Mande 12, 21000, Split |

Radoslav.Pavazza@fesb.hr | |

Web address |

Project assistants | |
---|---|

Name and Surname | Status |

Dario Ban | Researcher |

Branko Blagojević | Researcher |

Branka Bužančić Primorac | Scientific novice |

Ado Matoković | Researcher |

Radoslav Pavazza | Project leader |

Bože Plazibat | Researcher |

Frane Vlak | Researcher |

Marko Vukasović | Scientific novice |

Kalman Žiha | Researcher |