Shear wall lateral system - what is the minimum percentage

[EngrRC]

I am designing a building with lateral resisting system composed of shear walls to ASCE 7-16. Vertical resisting system uses frames and shear walls.
Some earthquake base shear is taken by the columns - is there a limit (minimum %) for which the "shear wall system" no longer becomes applicable and it should be designed to Dual System?

For dual system, I know that the moment frames shall be designed to carry at least 25% of the base shear. To clarify, my question is when should I comply with this- when my columns resist 5%, 10%, 25% or what percentage of the base shear? The code does not seem to explain this.

 

[HTURKAK]

I think the standard is ckear. Pls look 12.2.5.1

12.2.5.1 Dual System. For a dual system, the moment frames shall be capable of resisting at least 25% of the design seismic forces. The total seismic force resistance is to be provided by the combination of the moment frames and the shear walls or braced frames in proportion to their rigidities.

As specified in Section 12.2.5.1, and Table 12.2.1 the moment resisting frame in any of the dual systems must be capable of resisting at least 25% of the seismic base shear.If your system does not satisfy min. 25 % criteria , your system can not be considered dual system and needs to be designed as sinngle system.