When there are minimal lengths of walls on the bracing lines or one is unable to obtain the required bracing demand for the bracing lines. These are often constructed using steel parallel flange channels (PFCs) as PFCs are readily accommodated within the wall framing.
Portal frames can also be constructed using timber as well. However, timber portal frames have limited application and are unlikely to provide the necessary bracing units for many applications due to low stiffness in comparison to steel.
The charts and details below provide a quick reference for architects to use when it is not possible to obtain the required bracing demand.
Portal frame design requires engineering sign-off for Council submission as it is Specific Engineering Design (SED) and outside the scope of NZS 3604. Typical details have been provided for a 230PFC portal frame and 300 x 90 Hy90 timber portal frame. If you require further assistance with bracing or sign-off on a portal design in your building, please get in contact with ProConsult. We can offer efficient design solutions for your bracing requirements.
It is important to note the limitations below and the sizes indicated are the minimum required sizes for the spans and very light loads.
ProConsult have been engaged with many portal frame designs through the country. Please contact us today to discuss your requirements.
Stewart is the journal editor for SESOC (Structural Engineering Society New Zealand (Inc.)
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