Projecto avan ado de estruturas navais
This presentation is the property of its rightful owner.
Sponsored Links
1 / 19

Projecto Avançado de Estruturas Navais PowerPoint PPT Presentation


  • 48 Views
  • Uploaded on
  • Presentation posted in: General

Projecto Avançado de Estruturas Navais. Mestrado em Engenharia Naval. Contents (1). Structural Stability – basic principles Linear approach Non-linear response Non-linear behavior of beam-columns and plates subjected to compressive and combined loading. Influence of initial imperfections

Download Presentation

Projecto Avançado de Estruturas Navais

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Projecto avan ado de estruturas navais

Projecto Avançado de Estruturas Navais

Mestrado em Engenharia Naval


Contents 1

Contents (1)

  • Structural Stability – basic principles

    • Linear approach

    • Non-linear response

  • Non-linear behavior of beam-columns and plates subjected to compressive and combined loading.

    • Influence of initial imperfections

  • Buckling of plates and stiffened plates

    • Initial imperfections

    • Residual stresses


Contents 2

Contents (2)

  • Ultimate strength of plates and stiffened plates

    • Concept of effective width

    • Reduction of strength due to imperfections and welding

  • Residual strength and post buckling behavior of components

  • Hull girder strength

    • Linear and Non-linear behavior

    • Ultimate bending moment

    • Residual strength


Structural stability basic principles

Structural StabilityBasic principles

  • Equilibrium stability concept

    • A) Stable

    • B) Unstable

    • C) Neutral

  • Structural limit states

    • Ultimate limit

      • Global Failure

      • Local Failure

    • Serviceable limit


Structural stability

Structural Stability

  • Stability and Instability

    • Ex: Euler column

      • EI – Structural modulus


Equilibrium state

Equilibrium state

  • A) Stable

  • B) Unstable

  • C) Stable

Transition between differentstates of equilibrium


Types of instability

Types of instability

  • Bifurcation

  • Snap-through

Euler column

P/PE=1+(pq/l)2/8


Local buckling

Local Buckling


Cylindrical shell

Cylindrical shell


Snap through

Snap-through


Non linearity

Non linearity

Physical non-linearity

Geometrical non-linearity


Bifurcation instability

Bifurcation Instability


Snap through instability

Snap-through Instability


Initial imperfections

Initial Imperfections


Initial imperfections example

Initial Imperfections (Example)


Material plasticity

Material (Plasticity)

  • Plasticity

  • Residual stresses


Stability criteria

Stability Criteria

  • Static criteria

    • Adjacent equilibrium criteria (bifurcation)

    • Energy criteria (Minimum Potential Energy)


Linear analysis

Linear Analysis

  • Discrete systems

  • Continuous systems

  • Aproximate methods

    • Finite differences method

    • Engesser-Newmark method

    • Galerkin method (diferential equations)

    • Rayleigh-Ritz method (potential energy)

    • Finite element method


Basic concepts

Basic concepts

  • Effective length

    • Boundary conditions

  • Effective width

    • Boundary conditions

    • Loading

    • Manufacturing

  • Initial geometric imperfections

    • Residual stresses and welding procedure

    • Mounting process and restraining

  • Residual stresses

    • Welding procedure

    • Restraining

    • Physical properties

  • Loading of the component

    • Combined loading

    • Boundary conditions


  • Login