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# Magnified Moments - nonsway frame

• To: seaint(--nospam--at)seaint.org
• Subject: Magnified Moments - nonsway frame
• From: "Anantha Narayan C.K." <anant_27(--nospam--at)yahoo.com>
• Date: Sun, 1 Oct 2006 18:36:24 +0100 (BST)

Greetings,

I would appreciate if someone helped me understand Clause 10.12.3.2 of ACI 318-02

"The factored moment M2 in Eq. 10-8 shall not be taken less than M2,min = Pu*(0.6+0.03*h) ... about each axis separately. For members in which M2min xceeds M2, the value of Cm from equation 10-13 shall be taken as 1.0 or shall be based on the computed end moments M1 and M2."

My question is thus:

1. Does this mean that Cm can be conservatively taken as 1.0 if M2 less than M2,min?
Or it can be computed to be Cm (Eq 10-13) based on the computed M1 and M2, where M2 is the value from analysis and not the minimum M2.
Is this right? This would give a value of Cm less than 1.0. Right?

2. The Mc = dns * M2 value from Eq. 10-8 would have the dns using the computed Cm from (1) and the M2 as the minimum M2?

Is my interpretation of the clause right?

Thanks
Anantha

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ANANTHA NARAYAN, E.I.
Structural Engineer
Bliss and Nyitray Inc.
Miami, FL - 33134

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