Wind Effects on a Three-Sided Billboard

[CovertShear]

I am designing a three-sided billboard as shown in a stock image below:

It's 12 m (39 ft) tall, the width and height of one face is around 4 m (13 ft), and the peak wind pressure is around 1,6 kN/m2 (33 psf), nothing fancy.
I would like to know how to calculate the wind pressure under different angles of wind direction, as shown here:

I know how to calculate the wind pressure on a flat billboard, but a triangle shape is something different.
I would expect some variation of pressure and suction forces.

Is there an article, a code section, or something else you guys could point me to?

Thanks

 

[SWComposites]

Google “ wind load on triangle”