projecto avançado de estruturas navais mestrado em engenharia naval
Post on 19-Dec-2015
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TRANSCRIPT
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)
• 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 StabilityBasic principles
• Equilibrium stability concept– A) Stable– B) Unstable– C) Neutral
• Structural limit states– Ultimate limit
• Global Failure• Local Failure
– Serviceable limit
Structural Stability
• Stability and Instability– Ex: Euler column
• EI – Structural modulus
2
2E
EIP
l
sin
xw x q
l
Equilibrium state
• A) Stable
• B) Unstable
• C) Stable
Transition between differentstates of equilibrium
Stability Criteria
• Static criteria– Adjacent equilibrium criteria (bifurcation)– Energy criteria (Minimum Potential Energy)
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• 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