Wind Drag Coefficients for Highway Signs and Support Structures (2023) / Chapter Skim
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Pages 107-112
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From page 107... ...
A-1 Wind-Tunnel Experimental Facility and Instrumentation A P P E N D I X A FACILITY AND INSTRUMENTATION For this research project, Dr. James Buchholz and his group at the University of Iowa conducted experiments in the recirculating wind-tunnel facility of the university, illustrated in Figure A1.
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From page 108... ...
A-2 Wind Drag Coefficients for Highway Signs and Support Structures Figure A2: Model force balance, with wind flow from left to rightandsign model at left of figure A1a: Panoramic (deformed) view of test section and wind-tunnel circuit A1b: Laser enclosure over test section A1c: Instrumentation traverse inside test section Figure A1: Recirculating wind-tunnel facility
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From page 109... ...
Wind-Tunnel Experimental Facility and Instrumentation A-3 Figure A3: Final design for force measurement apparatus and base plane configuration, showing a plan view, side view, and lateral view Notes: The base plane is modular to facilitate reconfiguration of signs on the middle section and to accommodate instrumentation traverse for inflow velocity characterization. Dimensions are in inches and millimeters.
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From page 110... ...
A-4 Wind Drag Coefficients for Highway Signs and Support Structures Figure A4: Detail view of the sign force balances with the load cells A National Instruments LabView–based data acquisition system was used to acquire force and flow velocity measurements in the wind tunnel. Mean drag forces were measured on the sign models over sampling durations sufficient to achieve a statistically converged measurement of the drag force.
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From page 111... ...
Wind-Tunnel Experimental Facility and Instrumentation A-5 Note: The instrumentation traverse with pitot probe installed is visible at top left. Figure A5: Acrylic base plane installed in the wind tunnel with a single force balance assembly and a model traffic sign installed Inflow conditions were characterized by several vertical profiles of wind velocity over the base plane at a location upstream of the sign installation positions.
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