Roof Diaphragm Bracing

Diaphragm action is an additional capacity of the panel to transfer the lateral loads to the outside edges of the panel to the eave for roof panels and to the ground for wall panels.

Roof diaphragm bracing.

Because this sheathing material does not provide a diaphragm at the plane of the roof other means of bracing the roof against horizontal loads must usually be employed. Roof type one roof brace per 50m2 of roof area see rule 8 for minimum requirements one roof brace per 25m2 of roof area see rule 8 for minimum requirements 1. Dormers porches do not require bracing. Roof planes less than 6m2 e g.

Bringing it back to basics you need to understand bracing lines the imaginary lines running along and across the full length or width of the plan for a timber framed building. For example the roof may be braced with diagonal metal straps applied to the top of the sheathing or with a layer of plywood or osb over the decking. At roof level bracing often known as a wind girder may be required to carry the horizontal forces at the top of the columns if there is no diaphragm. When a roof diaphragm has no openings or obstructions the calculations for shear are.

When designed correctly a roof diaphragm can reduce or eliminate the need for diagonal bracing. In a nutshell ceiling diaphragms under light and heavy roofs are required to comply with nzs 3604 2011. The bracing described in this brochure covers both framed roofs and fully trussed roofs. This stiffness provides stability and replaces the need for other bracing elements.

We are designing a large commercial warehouse. We decide to use steel angle 2l sections as horizontal bracing to withstand the large axial loads. Sheathed elements such as walls and a roof covere d with panels and tied together provide additional strength to the building. Or installed as a structural ceiling diaphragm in accordance with section 13 nzs 3604 ecoply structural racing and eiling diaphragms as specified in section 3 0 of the ecoply specification installation guide are suitable for bracing components in houses and.

Challenges of calculating shear. The diaphragm forces tend to be transferred to the vertical resisting elements. The distance from the exteriors vertical bracing are large around 300 ft we have a large axial load in the roof steel deck diaphragm the loads exceed the resistance of the connectors of the deck.