Hoarding design

[nj86]

Hey all,

I'm trying to produce a design for some steel mesh hoardings. One of the first things I'm trying to work out is the wind load but I'm not sure how to tackle this mainly as the wind code in BS 6399 relates to buildings mostly.

I was wondering if anyone knows how to calculate wind loads for hoardings or if there is a particular code for hoarding design?

Thanks

N

 

[ishvaaag]

A safe approach will be to take the projected load and using factors for small areas and the reductions for cylindrical members for both posts and mesh estimate the forces. However this won't be true at any location where the ice and snow may make more opaque the fence; you then should estimate the degree of obstruction and exposed height; it is easy to imagine combed, failed fences this way and less otherwise except by bad foundation, and of course, impact, that shouldn't be discarded.

 

[asixth]

When designing hoardings or freestanding walls, I use a pressure co-efficient of 1.5. Because you are designing a mesh, I would reduce this to account for the permeability. Also if the hoardings are temporary I would reduce the design to be less than a 500yr return, depending on the importance of the structure and the design life.

 

[ishvaaag]

All above thinking in fences not infilled in such way that may act like sails between posts... if truly opaque to the wind then even more than the forces for the plane free-standing obstacles would apply.

 

[csd72]

Look at BS5975 which is the falsework code but it is taken to apply to all temporary works. It has a section on wind loads.