Wind load on netting 1

[anchorengineer]

thread507-143083
JedClampett
You answered a previous question regarding the wind load on netting. You posted this:
If you can get a hold of an ASHRAE design handbook, there's formulas for losses through screens of different sizes. You can then run the fluid mechanics formula using air at 90 mph (or whatever you wind speed is), density times losses times v^2/2g, using the density of air and get the pressure directly.I did this once for a wrought iron fence and the end pressure was believable (between zero and the ASCE 7 solid sign pressure).
Could you pelase explain how that formula works?
Thanks!

http://www.anchorengineer.com

 

[Den32]

You can extrapolate wind loads on netting from ASCE 7.

See Design Wind Loads on 'Open Signs/Lattice Frameworks'. Read the notes regarding opening sizes to determine the force coefficients.

Need to know the diameter and spacing of netting.

 

[cap4000]

Just for an approximation typically golf netting is 8% to 16% solid depending on the manufacturer. An old Standard Building Code indicates that for a vertical surface of a primary frame or system that is 20% open the Cf = 0.55. Something to compare to your netting. The link is below.

http://www.texnetusa.com/heavy_duty.html

 

[cap4000]

A typo. Its 20% solid not open. Cf=0.55

 

[anchorengineer]

Thanks guys but local code says i need to use manufacturers tested data for wind design. I have to convert this permeablity into either a wind force or a percent voids.

http://www.anchorengineer.com

 

[XRS]

Be sure to consider the possibility of debri getting caught on the netting and increasing the wind load.

 

[boo1]

Also need to consider ice build up if in northern areas

Consider reviewing attached

 

[sdz]

This might help.

Wind Load Guide for the Selection of Line Post Spacing and Size
32-page guide for architects, specifiers, and engineers with information on the factors that influence the size and spacing of line posts. Includes 12 tables to help determine appropriate line post spacings in various wind load conditions.

http://www.associationsites.com/page.cfm?usr=clfma&pageid=898