Zusammenfassung
Very large roof suctions on low-rise buildings occur for isolated
buildings during bothfullscale experiments and wind tunnel tests
performed by many investigators. This paper investigates the sensitivity
of these high suctions to the presence of multiple surrounding building
configurations. This study uses the Wind Engineering Research Field
Laboratory (WERFL) building studied during the CSU/TTU Cooperative
Program in Wind Engineering as a basic building shape. A model of
the WERFL structure was constructed to a 1:50 scale and instrumented
withmultiple pressure ports. Pressure taps on the 1:50 scale building
model were connected to two 48-channel PSI transducer units. A large
number of ââdummyââ models of similar dimensions were constructed
to represent surrounding buildings. These model buildings were arranged
in various symmetric configurations withdifferent separation distances,
and placed in the Industrial Wind Tunnel of the Wind Engineering
and Fluids Laboratory, Colorado State University. Measurements include
mean, RMS and peak pressures, street canyon velocity profiles and
laser-sheet flow visualizations. Shelter effects produced by the
surrounding buildings on the central instrumented building were found
to be significant, suchth at flow patterns are displaced and mean
and peak induced loads are significantly different from the isolated
building base case. The surface pressures of master WERFL model inside
the urban street canyons were determined by the prognostic model
FLUENT using the four differences closure approximation and FDS,
large eddy simulations methodology. Calculations are compared against
fluid modeling from wind-tunnel test.
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