1. Connections/Støbeskel
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2. Støbeskel When designing a connection it is relevant to investegate:
ULS for compression
ULS for shearforvce
ULS for tension
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3. Connetion in concrete- Støbeskel
Shear stress in a connection:
Alternativ Grashoff:
(Elastic design)
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4. Shear force capacity Coulombs yielding hypotheses
Max shear force strength – half of the plastic compression strength.
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5. Connections- Strenght
Shear force strenght including reinforment (Reinforcement-vertical to the section that we are investigating) for prefabricated elements according too. EC2 pkt (1):
First contribution: cohesion
Second contribusion: friction (can also include reinforcement and compression)
C og μ� are constants and depends on the type of connection
Upper bound limit for shear force strenght
Where
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6. Connections- Strenght
Examples – See EC2 pkt :
Very smooth: c = 0,25 and µ = 0,5 - Smooth:
Smooth: c = 0,35 and µ = 0,6
Rough: c = 0,45 and µ = 0,7
Indented (Fortandet): c = 0,50 and µ = 0,9
If:
σ ≤ 0 → c = 0
If tension, kohesion is not included.
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7. Connection types If: σ ≤ 0 → c = 0
If tension, kohesion is not included.
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8. Shear force – investegate?
Connections where forces are transfered:
Horizontal connections
Vertical connections
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9. Gable: Stability walls and decks (Sidevederlag)
Facade: Stability walls and decks (Endevederlag)
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10. Vertical wall connection
Reinforcement can be included over and under the wall element and also U-bar in the wall element (hårnålebøjler)
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11. Example 7.4 : Shear force between flange and body: Fortandet støbeskel
C 30 (concrete strength)
No compression in the connection
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12. Example 7.4 :
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13. Example - Connections
Design the 2 connections marked with the colors green and blue.
The connection should be design for a shear force:
40 kN (Green)
80 kN (blue)
Assuming:
4 meter long connection
Thickness of the deck 220mm
Thickness of the wall 180mm
Normalforce acting on the blue section – N = 50 kN
Other assumtions are chosen.
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14. Project - connections Vertical connection between stability walls
Horizontal connection (Shear force and suction on the facade and the gable):
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