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RE: IBC 2000 Wind Loading

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Components would be like sheathing or girts.  If you have a column which is part of the MWRS, you may end up designing the MWRS using the “Horizontal Loads” based on positive interior pressure but then you need to investigate that column for loads with negative interior pressure.  You can’t tell that from the table but if you calculate the pressure for both positive and negative interior pressure, you will be able to see what is going on.

 

Roger C. Davis

Architect

SDS Architects, Inc.

205 N. Dewey Street

Eau Claire, WI 54703

(715) 832-1605

 

-----Original Message-----
From: John P. Riley [mailto:jpriley485(--nospam--at)peoplepc.com]
Sent: Thursday, May 27, 2004 7:46 AM
To: seaint(--nospam--at)seaint.org
Subject: IBC 2000 Wind Loading

 

The table is entitled "Main Windforce-Resisting System Loads ..." and there's another table for "components".  It seems to me that your interpretation assigns the "Max Horizontal Wall Loads" column to "components".

 

If you're right, then the intent must be that "Max Horizontal Wall Loads" are to be used if there's no frame.  Right?

 

I'm not trying to be difficult, this is confusing to me.  It certainly should be more intuitive.

 

John Riley

------------------

The “Horizontal Loads” number is the sum of the sum of the wall loads with either positive or negative internal pressure on both walls.  The “Maximum Horizontal Wall Loads” number includes positive internal pressure on one wall and negative internal pressure on the other wall.  You use the first number to design the “Main Wind Force Resisting System” and the second set of numbers to design wall systems supporting roof framing.

 

Roger C. Davis

Architect

SDS Architects, Inc.

205 N. Dewey Street

Eau Claire, WI 54703

(715) 832-1605

------------------

In Table 1609.6.2.1(1), why are there two columns labelled: 

   1. Horizontal Loads 

   2 . Maximum Horizontal Wall Loads 

and when do you use each? 

Please be kind. 

John Riley