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Hi everyone, I have a question in regards to estimating the effects of openings on a building to the pressures acting on buildings. To calculate the effects of locating openings on a building do we get a pressure resulting from the net pressure coefficient of the Cpe and the Cpi? To calculate...

Hi everyone, I have a question in regards to the calculation estimating the effects of openings on a building to the pressures acting on buildings. To calculate the effects of locating openings on a building do we get a pressure resulting from the net pressure coefficient of the Cpe and the...

Hi Agent666, I apologize for the late reply and thank you so much for your explanation.

Dear Agent666, Thank you for your reply. So, does that mean it the diagram has nothing to do with the location of the openings? For example design case 1 applies if the location of the opening is on the windward and leeward wall?

Hi everyone, I have some questions in regards to the rules stated in the AS/NZS 1170.2 under Section 5 on the Action Combination Factors (Kc). The standard states that when the building has 2 effective surfaces: Kc = 0.9 3 or more effective surfaces: Kc = 0.8 However, I am a little bit...

Dear hokie66, Thank you very much for the explanation. It's very helpful.

Dear hokie66, Does that mean there is no Cpe when the horizontal distance is from 2h to > 3h when h/d is >= 1.0?

Dear apsix and hokie66, Thank you very much for the explanation. Just one last question, I was wondering about the linear interpolation for the gable roof when the h/d >= 1. It states in Note 2 that the values in parentheses are for interpolation purposes. Does that mean that for value 2h to...

Dear Toby, I apologize for asking you again. I just wanted to know what constitute as surface as effective? For the internal surface I know that it is effective if |Cpi|> 0.2. But what about the other surfaces? Is it based on the situation and how the wind load acts on the building as shown in...

Dear hokie66, Thank you for your reply and explanation. I could understand it better now. If that's so, does that mean that if the pressure acts like the image below: There is an opening in both the leeward and windward wall only? And for the image below, there are openings on the windward...

Dear JedClampett, Thank you for your explanation. I could kind of understand it now.

Dear JedClampett, Thank you for your reply.I was actually wondering about a situation like the image below. I'm not too sure in what condition will cause the pressures to act in such a way.

Hi everyone, I am an architectural student that has just started learning about wind engineering. I have a bit of a problem trying to understand how the wind pressure works in a building. In what situation will the roof pressure act alone on a building?

Hi everyone, I just wanted to ask. To get the external pressure coefficient of roofs, for the intermediate values of the ratios and angles, the standard stated that they could be linear interpolated. However, interpolation should only be carried out on values of the same sign. So, does that...

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

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...

Hi Toby, Thank you very much for your reply. It is very helpful and I could understand it now.

Hi everyone, I am a bit confused in trying to determine the Kc of a structure using the AS/NZS 1170.2. It states in Section 5 of the standards that internal surfaces with |Cpi| < 0.2 is determined as an ineffective surface. However, in the table for the design cases, it asked how many surfaces...

I have a bit of confusion regarding the rules stated in the AS/NZS 1170 Section 5 on determining the internal pressure coefficient. I am wondering, is the Cpi determined from the table 5.1(A) or 5.1(B) for the whole building? Or is it only used as the Cpi on one surface?