Return to index: [Subject] [Thread] [Date] [Author]

[no subject]

[Subject Prev][Subject Next][Thread Prev][Thread Next]

James Lane wrote:

Have an existing 20'x20'x16'height box with the top open. The box sets on
the top of a roof.

Question: Does the second (leeward wall) pick up full wind pressure as the
first wall? Any good references for how much the second wall will pick up.

In the past I have always been conservative and used full pressures on both.
What if the bax were smaller the first wall would shield the second wall and
you would think pressures would be less.

Any comments


Sounds like you have a partially enclosed structure.  The near wall must be
designed for both internal pressures pulling in and windward pressures pushing
in.  The far wall must be designed for both internal pressures pushing out and
leeward pressures pulling out.  In both cases, the effects are additive.  Of
course, for the structure as a whole, the interior pressures are equal and
opposite.  Depending on which code you are designing for, see either 1997 UBC
Table 16-H, Item 2, Wall elements or ASCE 7-95, Tables 6-1 and 6-4.4

Rick Drake, SE
Fluor Daniel, Aliso Viejo, CA

 The information transmitted is intended only for the person or 
 entity to which it is addressed and may contain confidential   
 and/or privileged material. If you are not the intended        
 recipient of this message you are hereby notified that any     
 use, review, retransmission, dissemination, distribution,      
 reproduction or any action taken in reliance upon this message 
 is prohibited. If you received this in error, please contact   
 the sender and delete the material from any computer.  Any     
 views expressed in this message are those of the individual    
 sender and may not necessarily reflect the views of the