Authors: Daniel Cantero & Dr. Arturo González (University College Dublin)
description
Transcript of Authors: Daniel Cantero & Dr. Arturo González (University College Dublin)
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Location and Evaluation of Maximum Dynamic Effects on a Simply Supported
Beam due to a Quarter-Car Model
Authors:
Daniel Cantero & Dr. Arturo González(University College Dublin)
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Overview
1) Introduction
2) P-load
3) Speed Influence
4) Monte Carlo
5) Conclusions
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Introduction
Vehicle/Bridge Interaction
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Maximum Stress not necessarily at mid-span
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P-load
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Euler-Bernoulli beam
Constant vertical force at constant speed
Span = 25m Speed = 25 m/s Load = 10 KN
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Vehicle position (m)
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Ben
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Mom
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P-load
Static Bending Moment at mid-span
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P-load
Total Bending Moment at mid-span(Static + Dynamic)
DAF = 0.9959
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Observation point (m)
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Observation point (m)
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P-load
Total Bending Moment(Static + Dynamic)
FDAF = 1.0648
COP = 11 m
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P-load
FDAF DAF
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FDAF = ( 1 + γ ) · DAF
P-load
Dynamic Amplification Factor DAF = 0.9959
Full length Dynamic Amplification Factor FDAF = 1.0648
γ = 6.92 %
Critical Observation PointCOP = 11 m
COP = 44 %
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Speed Influence
DynamicAmplification
DAF & FDAF
γ valuesCOP
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Monte Carlo
Vehicle parameters ( Speed, Masses, Suspension stiffness and damping, Tyre stiffness)
Bridge lengths ( 8 different spans between 17 and 31 m)
Road profile ( ISO Class A, B and C profiles)
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Monte Carlo
COP
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γ values
Monte Carlo
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Monte Carlo
Mean Values
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Conclusions
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1) Maximum stress can be significantly higher than mid-span stress
2) Maximum stresses occur in between 30 % and 70 % of bridge span
3) Road roughness has big influence
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Acknowledgments
Assessment and Rehabilitation of Central European Highway Structures
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