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Method of Finite Elements I
PhD Candidate - Konstantinos TatsisHIL H33.1
Lecture 1 - 20 February, 2017
Institute of Structural Engineering Method of Finite Elements I 1
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
Institute of Structural Engineering Method of Finite Elements I 2
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
Institute of Structural Engineering Method of Finite Elements I 3
Soft bending actuator
Adaptive solar facade
Actuator with pneumatic networks
Adjust the degree of shading
Institute of Structural Engineering Method of Finite Elements I 4
Soft bending actuator
Animation with Femap software
Institute of Structural Engineering Method of Finite Elements I 5
Ship structures
Wave induced loads
’Hogging’ and ’sagging’ motions
High in-plane stresses
Loss of stability
Institute of Structural Engineering Method of Finite Elements I 6
Ship structures
Decomposition into basic structural elements
=
+
++
Institute of Structural Engineering Method of Finite Elements I 7
Ship structures - Stiffened panel
Failure modes
Local buckling, when stiffeners are strong
Overall buckling, when stiffeners are slender
Institute of Structural Engineering Method of Finite Elements I 8
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
Institute of Structural Engineering Method of Finite Elements I 9
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