Roller doors - wind pressure design

[rowingengineer]

As everyone would be aware, the roller door code AS4505 has been update and referenced in the BCA for regions C & D.

This has ensured that every roller door supplier is now supplying with wind locks.

my questions is do you believe we need to design for full internal pressure or just external pressure to the building.

AS1170.2 still allows you to assume a dominant opening at this roller doors, base on the in-ability of the door, jamb or connections. AS4505 has no requirement for the supporting structure.

as such I would prefer if a dominant opening developed elsewhere in the building then my roller door failed rather than trying to design my roller door to take this loading

type of roller door I am discussing:

http://www.bnd.com.au/products/residential-doors/roller-garage-doors/wind-locked-roll-a-door

if you look at the load assumptions by the roller door manufacture, they assume +0.6, -0.3 internal coefficients.

http://www.nceng.com.au/

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[OzEng80]

RE - just looked over this code for the first time. To me it provides some pretty specific guidance for the loads to be applied to the supporting structure.

I wouldn't be too concerned about dominant openings and would just adopt the pressure provided in AS4505 (table 5.2) for your wind classification and the in-plane forces derived from appendix E. I think it would be hard to justify a smaller load.

Note that a dominant opening in this instance would be caused from flying debris (not the inability of the door and substructure to take the load).