...
According to article 4.3.4.6 of TBDY , ductility level should be provided in mixed carrier structural systems (4.3).
∑ M DEV ≥ 0.75 M o (4.3)
Possible solutions:
A curtain Shearwall / curtain shearwall group can be added to the carrier structural system until the 4.3 condition is met.
Solution can be made by choosing high ductility level. ( A14 or A15 )
In buildings with BYS> = 7, a solution can be made by selecting the A31 system type.
...