And what about m12=?Īnd what about f11= f22=? I believe I should use 1 to account elastic shortening correctly. Is it a mistake or am I missing something?Īccording to ACI318 and ATKINS I should I use m11= m22=0.7. If F11& F22 are axial forces, why in CSI website Link is stated that f11 controls EI? EI is obviously related to bending (so to m11&m22), whereas f11=f22 control EA (axial behavior), and f12 controls GA (in plane shear behavior).
Shear v23 modifier (supposed to be out-of plane shear)Īnd in CSI Analysis Reference manual at p.144 is specified that F11& F22 are axial forces along axis 1&2, F12 is shear within plane 1-2, M11& M22 are bending moments out of plane, and M12 is torsional moment, and V13& V23 are transverse shear out of plane, according with what I have written above. Shear v13 modifier (supposed to be out-of plane shear) Membrane f12 modifier (supposed to be in-plane shear)īending m11 modifier (supposed to be bending moment about axis 1)īending m22 modifier (supposed to be bending moment about axis 2)īending m12 modifier (supposed to be torsional moment about axis 3) Membrane f22 modifier (supposed to be axial force along axis 2) Membrane f11 modifier (supposed to be axial force along axis 1) In wall's ETABS table is required to specify: I read a lot about stiffness modifiers for shear walls (CSI website, ATKINS manual, Eng-Tips forum threads.), but I have some doubts about what they report because they say different things, and they look different to what is required by ETABS. Hi everybody, please help me cause I'm getting frustrated with all these different explanations!
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