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Generally we reduce the f22 f12 m11 m22 m12 modifier to 0.35 assuming that the wall is cracked so base shear will diverted towards column. This results in reduction in area of steel of shear wall. Moreover we put 1 in f11 because we believe that shear wall is taking 100% in plane force but the judgement between f11 and f22 is based on your structure. Moreover you check and compare stress with modulus of rupture to judge what value is to be used i.e 0.35(if stress exceed modulus of rupture) or (between 0.35 and 0.7) Thank u