The above discussion applies assuming the local axes 1 and 2 of the shear wall area object are either vertical or horizontal. You should, however, note that some of our users use modifiers for f12 also, where they expect deterioration of shear stiffness and want to be realistic in their modeling. There is no recommendation about reducing the GA shear. The code recommendations in Section 10.10 of ACI 318 code are related to slenderness effects where flexural deformations govern so they have recommended modifying EI (corresponding to f11 or f22 for shear walls). In column and code terms f11 or f22 would correspond to modifications of EI or EA and f12 would correspond to modifications to GA shear. Refer to the below Figure which shows the direction of local axes and their corresponding stiffnesses:įor shear wall (both piers and spandrels), the flexural and axial behavior is modified by either f11 or f22 depending on the orientation of the local axis and the shear behavior is controlled by f12. inplane stiffness refers as f11, f22 and f12 and out-of-plane stiffness refers as m11, m22 and m12. In ETABS, shell or area element has two types of stiffnesses i.e.
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January 2023
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