Wind Loads on Structures
Wind Loads on Structures
(OP)
When determining design pressures to be used for wind loads on buildings, do I use only the "p" design pressure imposed on the exterior surface of a structure, or do I apply the "GCpi" product of internal pressure coefficient, which is also expressed in psf and results in a near double pressure than that of the "p" design pressure.
Past and currently, use the larger of the two pressures, for insurance. Must I consider the internal pressure coefficient as THE design pressure?
Thank you!
Past and currently, use the larger of the two pressures, for insurance. Must I consider the internal pressure coefficient as THE design pressure?
Thank you!






RE: Wind Loads on Structures
The conditions of the building (shape, location, proximity to other buildings/open spaces/etc.)dictate the analytical parameters to be used, whether you are using IBC, ASCE or others. Senior input and overview should be sought on a local level for such interpretive issues.
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RE: Wind Loads on Structures
DaveAtkins
RE: Wind Loads on Structures
DaveAtkins' comment is correct.
But to elaborate further, the correct procedure is to add the external and internal pressure algebraically. As he says, for Main wind force resisting systems, the internal pressure cancels out. Also as he says, for designing the walls themselves( wall panels, girts & their connections) you must take the resulant of external + internal. The same thing occurs for the sidewalls.
For roofs, there is no opposite panel as for the walls, so for roofs you must figure the resultant for both MWFS and for the components & cladding.
Also, when calculating overturning loads on the foundation, this same effect occurs with the roof.
For a good reference, check "Guide to Wind Loads in ASCE 7-02, available from ASCE bookstore.
Regards,
chichuck
RE: Wind Loads on Structures
Best regards,
Bill Yanko
RE: Wind Loads on Structures
It covers wind effects and damages and the wind load provisions of ASCE 7-02. Learn current approaches for assessing wind loads and examining building performance in severe storms. It is also beneficial to individuals involved in the interpretation of wind load standards and codes. I found a few minor errors, but the guide is very informative.
RE: Wind Loads on Structures
I am in complete agreement with Ron. Is a qualified PE mentoring you? I don’t ask to insult you in any way. I have heard from many colleagues that the mentoring system is breaking down. There are apparently a lot of younger engineers out there who are not being taught properly.
I was luck enough to be mentored by a PE who was a great engineer and a good teacher. I swear there were times when I would ask him or a couple of the other engineers in our office a hundred questions a day. His office was always open and I took advantage of it. You should not be expected to know all the details of building construction in the first 5(or maybe 25
In short, EIT2, if you are in a position were you either do not have a qualified mentor or he is not accessible. You need to fix the situation either by talking to the person or changing jobs.
Best of luck
tfl
RE: Wind Loads on Structures
RE: Wind Loads on Structures
RE: Wind Loads on Structures
internal pressure typically cancels out when designing the main wind force resisting system. But in some cases, it does not;
You could have a building with an expansion joint running perpendicular to the wind direction. In this case, the windward half of the building experiences windward load pushing in and internal pressure pushing in or out. The internal pressure on the far leeward wall is not felt by the front half of the building so the internal pressure is additiive to both the windward and leeward forces on each half independently.
RE: Wind Loads on Structures
RE: Wind Loads on Structures
Thanks for the help
RE: Wind Loads on Structures
keep asking the questions, the only stupid question is the one you don't ask .. to quote somebody.
There's some good stuff and and some bad stuff on here, i'm always amazed at the people that will step up to the plate and offer opinions when they absolutely don't have enough info to actually give a sound opinion... most of this related to forensic ... i mean how many times we've done investigations, they take alot of time and deep digging ...
Engineer in Training your welcome here. My hope is your using this forum as a sounding board and the people on it will give you the time of day so that when you show up at work your mentor/boss will have a degree of confidence in you.
This forum is a tool. Good luck!
Guess i didn't answer your question ... ASCE 7-02 is your answer.