Hi!
I'm from Finland and doing a study for my Civil Engineering degree, and the subject is wind loads during construction. One of the things I'm trying to figure out is how the wind behaves when you have multiple frames (without claddings) in a row. I was thinking to use RSA wind simulation to get a little understanding on how much they are shielding each other.
The shielding-effect is something that the Eurocodes don't even mention, at least what I have found out?
Some data of my test:
I have 9 rows of frames, and the wind direction is parallel to them. (+y-axis)
The frames consists of two columns (RHS 250x250x8) and a truss with the span 20 meters.
The distance between the frames is 8 meters.
I use wind velocity: 21 m/s and wind profile according to the exposure factor for Terrain category II (figur 4.2 in EN 1991-1-4)
When I use the wind simulation in RSA 2018 on my frames, the columns in the first row gets a windload of 0,11 kN/m, and the second rows columns get a windload of only 0,03 kN/m. And the rest of my rows columns have a windload on 0,01-0,02 kN/m. That means that the first row takes full windload, but already by the second row, the windload have been reduced by over 70%. Could that be correct, that the shielding effect from the first row to the second is that effective even though the distance between them is 8 meters?
Or Is it even possible to analyse the windflow on an open frame structure with RSA wind simulation tool?
I'm attaching some pictures, so it will be easier to understand my question.
