finite element modeling of long-span steel suspension
TRANSCRIPT
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Finite Element Modeling of Long-Span SteelSuspension Bridges in Civil Engineering
Dynamore GmbH - 2018 LS-Dyna Forum - Civil Engineering - 14 October 2018 – Raum 4- 16:00 hours
SAMI A. KILIC HANS JUERGEN RAATSCHEN BERND KOERFGEN
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Outline
> Overview of the the Fatih Sultan Mehmet Bridge located in Istanbul, Turkey
> Finite element modeling
> Eigenvalue analysis results
> Earthquake simulations (recent progress)
> Conclusions
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The Fatih Sultan Mehmet Bridge – a.k.a. The Second Bosporus Bridge
> Composed of steel towers and steel deck> Span length: 1090m> 2 x 4 lanes of traffic; commercial truck traffic
(in the past) and now only local commuter traffic is allowed
> Total mass of 34,000 metric tons of steel> Opened to service in July 1988 – built by a
consortium of Japanese companies including the IHI Corporation and Mitsubishi Heavy Industries
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The Fatih Sultan Mehmet Bridge – a.k.a. The Second Bosporus Bridge
> Tower height above the road level: 98m> Deck level above sea: 66m> The 3m-high and 39.40m-wide bridge
deck is a hollow steel box section composed of orthotropic stiffened panels
> Diaphragm wall panels exist in the deck structure approximately at every 4m.
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The Fatih Sultan Mehmet Bridge
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The Fatih Sultan Mehmet Bridge: Journey Back in Time (1987)
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The Fatih Sultan Mehmet Bridge: Articulation; Rocker Bearing and Windshoe
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The Fatih Sultan Mehmet Bridge: Articulation; Windshoe
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The Fatih Sultan Mehmet Bridge: Articulation; Rocker Bearing
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Line/Beam Element Models
> Advantages:Easy to constructFast run-time
> Disadvantages:Reasonable accuracy for global behaviorPoor accuracy for higher modesPoor accuracy particularly for torsional modesNot suited for modeling non-linear effects such as plastic strain concentration, impact between two entities coming into contact
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The Fatih Sultan Mehmet Bridge: Previous Work Done Using a Line Element Model
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Shell Element Models
> Advantages:Better accuracy; no need to fine-tune the model; no fudge factors; no adjustment knobs necessarySuited for non-linear simulationsBetter visualization
> Disadvantages:Difficult to constructIncreased run-time for computationsRequires high performance parallel computing platforms for practical use
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FSM: Shell Element Model (Continued)
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FSM: Shell Element Model (Continued)
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FSM: Shell Element Model (Continued)
* The span dimension is given in millimeters.
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FSM: Shell Element Model (Continued)
Photo of the actual structure
LS-Dyna shell model
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FSM: Shell Element Model (Continued)
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FSM: Implicit Analysis Steps
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FSM: Implicit Analysis Steps
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FSM: Implicit Analysis Steps
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Eigenvalue Results: Lateral Mode
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Eigenvalue Results: Vertical Mode
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Eigenvalue Results: Torsional Mode
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Erdbeben Results: Catwalk to Tower Impact
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Earthquake/Erdbeben Simulations with Implicit-Explicit Switching
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MPP Domain Decomp. Problem Constraints
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MPP Domain Decomp. Error: Constraint is Defunct / Windshoe to Deck Connection is not working !
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MPP Dom. Decomp.: How to Fix it Manually?
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MPP Dom. Decomp. Problem Manually Fixed
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MPP Domain Decomp. Correction for Constraints: Problem Fixed
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Conclusions
• Shell model and ambient vibration measurements are in agreement for a wide range of eigenmodes, including the torsional model
• Earthquake/Erdbeben simulations demonstrate the possibility of deck-to-tower impact for strong ground motions.
• Future work will involve the investigation of large vibrations dampers that could be installed in the bridge. Currently, the larger-span Osmangazi Izmit Bay Crossing Bridge has vibrations dampers installed, and the bridge is currently in service.
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• Refereed paper in an archival journal:
Kilic, S. A., Raatschen, H. J. , Körfgen, B., Apaydin, N. M., Astaneh-Asl, A., “FE Model of the Fatih Sultan Mehmet Suspension Bridge Using Thin Shell Finite Elements”, Ara. Jou. Sci. Eng., Springer, 42(3), 1103-1116, March 2017.
Further Information
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Thank you for your
attention!Questions?