3. WIND PRESSURE DISTRIBUTION ON BUILDINGS
The values of external wind pressure coefficients on the
facade are not specified in EN 1991-1-4 for atypical
buildings and buildings in groups. It is necessary to
determine these values by experimental measurements
or numerical simulation.
The new wind tunnel in Bratislava allows in its two
measuring areas to simulate steady and turbulent wind
flow. In the first phase we tested the model – a quarter
of a circle in the front space in steady flow by changing of
wind direction (Fig. 13, 14). The models were rotated
every 15º or 22,5º, thereby simulating the changing of
wind direction acting on the objects.
3/2017
The external wind pressure coefficients obtained from
repeated experimental measurements made on the
model in steady and turbulent wind flow indicates the
local extremes of suction in certain directions.
This can cause hazardous zones on facades or cladding
of buildings. We can optimize the position of the objects
- buildings in urban planning with respect to the wind
direction in the site.
← Figure 13: Models of buildings on turn table
in central zone in Bratislava city (SF 1:300)
in turbulent wind flow
↓ Figure 14: Models of different types of buildings
on turn table in Bratislava city in turbulent wind
flow