Aeroelastic Analysis of Bridge Girder Section Using Computer Modeling

Selvam, R. P.; Govindaswamy, Suresh

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Aeroelastic Analysis of Bridge Girder Section Using Computer Modeling

2001-05-01
By Selvam, R. P. ; Govindaswamy, Suresh

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Creators:

Selvam, R. P. ; Govindaswamy, Suresh

Selvam, R. P. ; Govindaswamy, Suresh Less -
Subject/TRT Terms:

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Aeroelastic Analysis Bridges Computational Fluid Dynamics Computational Structural Dynamics Computer Models Critical Velocity Finite Element Method Flow Fluid Dynamics Flutter (Aeronautics) Girders Numerical Analysis Simulation Suspension Bridges Velocity Wind Wind Tunnels
Resource Type:

Research Paper
Corporate Publisher:

Mack-Blackwell National Rural Transportation Study Center (U.S.)
Abstract:

This report describes the numerical simulation of wind flow around bridges using the Finite Element Method (FEM) and the principles of Computational Fluid Dynamics (CFD) and Computational Structural Dynamics (CSD). Since, the suspension bridges are prone to the aerodynamic instabilities caused by wind this becomes a prime criterion to be checked during the design. If the wind velocity exceeds the critical velocity for flutter that the bridge can withstand, then the bridge fails due to the phenomenon of flutter.

Tacoma?s narrows bridge failure in Washington, USA is a classical example of this failure. Larsen and Walther (1997) used the Discrete Vortex Method (DVM) similar to the wind tunnel procedures. In this work, the computations are carried out for both the fixed and the moving bridge conditions. A Large Eddy Simulation (LES) turbulence

model is used and the rigid body grid movement technique is adopted. The critical velocity for flutter is calculated directly using the free oscillation procedure similar to the approaches reported by Selvam et. al (1998 and 2000). The influence of grid on critical

velocity is also studied. The computed critical velocity for flutter is in good agreement with the wind tunnel measurements. The conditions of flutter and no flutter are demonstrated clearly using the response of the bridge in time.
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PDF
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University Transportation Centers US Transportation Collection
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urn:sha256:25c4f55cf41b332f5723c1cfc22b39ba59412b5ee3353c1f2c410b47d59064fc
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https://rosap.ntl.bts.gov/view/dot/33885/dot_33885_DS1.pdf
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Aeroelastic Analysis of Bridge Girder Section Using Computer Modeling

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