AS/NZS 1170.2: Local Pressure Factor

Question

AS/NZS 1170.2: Local Pressure Factor

Xaviera (Structural)

(OP)

2 Oct 17 07:53

Hi all,

I have a question regarding the determination of the Local Pressure Factor in Section 5 of the AS/NZS 1170.2. I have read a few books regarding this topic but I am still not able to understand the standard. The standard states that the Building Aspect Ratio is calculated as average height / smaller of b or smaller of d. I am not sure what it meant by smaller of b. Does that mean the smaller number between the two results? Also, I have trouble understanding the building reference number in the design cases. Does the Kl only apply to the reference number drawn on the diagram? Or can there be multiple elements? And does the reference number represents the area covered by claddings? Thank you in advance for your help. I will appreciate it very much.

apsix (Structural) · Answer 1 · 2017-10-06 03:51:51

The BAR is actually defined as the average roof height (h) divided by the smaller of b or d, ie the smaller plan dimension.
The reference number on the diagram is a representative location for the associated Kl. There are multiple elements with multiple factors, but they are assessed in isolation, only one Kl at once.
It is only applied to cladding and immediate supports such as purlins, and their fixings.

Xaviera (Structural) · Answer 2 · 2017-10-07 08:27:58

Hi apsix,

Thank you very much for your reply and explanation. I could understand it better now.

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AS/NZS 1170.2: Local Pressure Factor