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RE: IBC Deflection Limits for Brick Cladding

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I believe the 0.42 factor is taking into account that the wind pressures 
calculated in ASCE 7-10 are ultimate-level loads, rather than 
service-level, as was the case in previous editions.  The 0.42 is combining 
 the conversion from ultimate to service and 50-year to 10-year wind.

I'm not sure about the L/240.  I wonder what the Brick Institute would say 
about that.  Seems too flexible to me.

-- Joel Adair
    SHW Group
    Plano, TX

-----Original Message-----
From: seaint-seaosc(--nospam--at) [mailto:seaint-seaosc(--nospam--at)] On 
Behalf Of Harold Sprague Sent: Tuesday, October 02, 2012 2:10 PM
To: seaint-seaosc(--nospam--at)
Subject: [SEAINT-SEAOSC] IBC Deflection Limits for Brick Cladding

The 2012 International Building Code (IBC), Table 1604.3 provides a 
deflection limit of L/240 for "other brittle finishes" with the wind 
pressure taken as 0.42 times the “component and cladding” pressures for 
 determining deflection limits.  I have presumed this to apply to brick 
veneer / stud wall systems.

The basis of this provision is not provided in the IBC.  In the past a 10 
year wind was roughly equivalent to about 0.75 times the 50 year wind.

Does anyone know the basis for either the L/240 or the 0.42 factor?

Regards, Harold Sprague

> Date: Tue, 2 Oct 2012 09:36:03 -0700
> From: r_varjavand(--nospam--at)
> Subject: [SEAINT-SEAOSC] Site Amplification in Japanese Codes
> To: seaint-seaosc(--nospam--at)
> Good morning,

Truncated 1285 characters in the previous message to save energy.

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