ค่า Stiffness Modifier ใน Sap2000 และ Etabs

พอดีสงสัยเรื่องหา Stiffness Modifier ใน SAP2000 และ ETABS ครับ

Assuming beams and columns are modeled as frame then the stiffness modifier table is as follows:
 
ACI                                                                       ETABS
 
Beams........................................0.35*Ig               I22 = I33 = 0.35
Columns....................................0.70*Ig               I22 = I33 = 0.70
Walls-Uncracked.................0.70*Ig                   modeled as shell – f11, f22 = 0.70  
Walls-Cracked......................0.35*Ig                  similar to Walls-Uncracked (with modifiers of 0.35)
 
NOTE:
Walls are generally not designed for out-of-plane bending to avoid excessive longitudinal reinforcement. In this case, use a small modifier say 0.1 for m11, m22 and m12 so numerical instabilities could be avoided. However, use  m11, m22, m12 = 0.70 (or 0.35) when considering the out-of-plane bending in wall.
 
Flat Plates & Flat Slabs....0.25*Ig                         modeled as membrane – f11, f22, f12 = 0.25 / modeled as shell – f11, f22, f12, m11, m22, m12 = 0.25 (for both cases fxx is not important if rigid diaphragm is assigned)

พอดีไปเจอบทความจากเวปนี้มา  https://wiki.csiamerica.com/display/etabs/Modeling+concrete+cracked+section+properties+for+building+analysis
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