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Faculty of Civil Engineering - TUCN
About the Network Arch Bridge
Alexandra Danciu, Lecturer PhD. Eng.
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1. History of Network Arch Bridges
2. Concept
3. Bridges around the world
3. Case study
Topics
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History of Network Arch Bridges
Network arch
Nielsen bridge
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History of Network Arch Bridges
Per Tveit, dr. Eng, Docent Emeritus, Norway, [email protected]
http://home.uia.no/pert/index.php/Home
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History of Network Arch Bridges
193 t
679 t
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Concept
1. The arch
2. The hangers
3. The lower chord
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Concept
-steel, often circular
- American wide flange – easy to find
- Longer spans – box section
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Concept
b/t = 31.25, A=69696 mm^2
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Concept
Brunn and Schanack, 2003
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Concept
15 – 17 % of the span
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Concept
- Wires or rods
- No compression
- Hangers can relax – network ≠ truss
Increase in the bending moments
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Concept
The radial arrangement
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Concept
Ф= 40-60mm
Protection
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Concept
Teich & Wendelin 2001
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Bridges around the world
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Bridges around the world
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Bridges around the world
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Bridges around the world
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Bridges around the world
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Bridges around the world
Waikato River Network Arch
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Bridges around the world
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Bridges around the world
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Bridges around the world
Flora Bridge over the Mitteland Canal in
Germany
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Bridges around the world
Network arch over B6 at Halle
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Bridges around the world
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Bridges around the world
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Bridges around the world
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Bridges around the world
THE BRANDANGER BRIDGE IS THE WORLD’S MOST SLENDER ARCH BRIDGE
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Bridges around the world
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Bridges around the world
TROJA BRIDGE IN PRAGUE
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Bridges around the world
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Bridges around the world
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Bridges around the world
“Palma del Río” bowstring arch Bridge. Córdoba. Spain.
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Bridges around the world
“Deba” bowstring arch Bridge.
Guipuzcoa. Spain.
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Bridges around the world
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Bridges around the world
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Bridges around the world
Blennerhassett Island Bridge , 268m
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Bridges around the world
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Case study
Cross-section
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Case study
The arch – HD 400x634
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Case study
The hangers – Full locked coil strands
The tie – concrete beam C40/50
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Case study
The model
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Case study
Live load: LM1 + pedestrians 3 kN/mp – 1 sidewalk
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Case study
Load cases:
- Dead load
- Structure
- Asphalt, railings, etc.
- Live load
- LM1 – TS + UDL
- Pedestrians
- Wind
- Wind x
- Wind y
- Wind z
Load combinations:
- Dead load
- SLS
- ULS.
- Dead + Live+Wind
- SLS
- ULS
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Case study
Hangers – tension vs no tension
- deflection - dead weight
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Case study
Tension in the hangers vs. no tension
- deflection - dead + live
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Case study
Tension in the hangers
deflection - TS vs UDL
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Case study
Forces – tension
- Axial force in the TIE + bending moment
- dead load
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Case study
Forces – no tension
- Axial force in the TIE + bending moment
- dead load
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Case study
Forces – tension
- Axial force in the TIE + bending moment
- DEAD + LIVE
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Case study
Forces – NO tension
- Axial force in the TIE + bending moment
- DEAD + LIVE
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Case study
Forces – tension
- Axial force in the ARCH + bending moment
- DEAD
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Case study
Forces – NO tension
- Axial force in the ARCH + bending moment
- DEAD
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Case study
Forces – NO tension
- Axial force in the ARCH + bending moment
- DEAD + LIVE
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Case study
Forces – tension
- Axial force in the ARCH + bending moment
- DEAD + LIVE
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Case study
LM1 – static vs moving load
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Case study
Deformed shape – relaxed hangers
Dead
Dead + live
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Bibliography
http://home.uia.no/pert/index.php/Home
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Thank you for your attention!
Questions?