Method of Finite Elements I

PhD Candidate - Konstantinos TatsisHIL H33.1

Lecture 1 - 20 February, 2017

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Analysis of bridge response

Composite bridge

Steel beams

Concrete slab

Shear connection

Load cases

Traffic loads

Construction stages

Cracked concrete

Types of analysis

Steady-state (Linear/Non-linear)

Dynamic (Linear/non-linear)

Eigenvalue

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Soft bending actuator

Functional aspects

Inflatable channels and chambers

Motion using pressure

Materials with different elasticbehaviour

Physical aspects

Fluid-structure interaction

Pressure inside the chambers

Contact between adjacentchambers

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Soft bending actuator

Adaptive solar facade

Actuator with pneumatic networks

Adjust the degree of shading

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Soft bending actuator

Animation with Femap software

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Ship structures

Wave induced loads

’Hogging’ and ’sagging’ motions

High in-plane stresses

Loss of stability

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Ship structures

Decomposition into basic structural elements

=

+

++

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Ship structures - Stiffened panel

Failure modes

Local buckling, when stiffeners are strong

Overall buckling, when stiffeners are slender

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Ship structures - Stiffened panel

Local buckling of plates

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5

4

5

6

m=1

m=2

m=3

m=4m=5

Aspect Ratio a/b

Buc

klin

gC

oeff

icie

ntk

σx =π2D

a2t

[m+

1

m

(ab

)2]2

= kπ2E

12(1− ν2)

(t

b

)2

(a) First mode - m=3

(b) Second mode - m=4

(c) Third mode - m=2

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Ship structures - Stiffened panel

Overall buckling - Analysis with ANSYS software

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