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The condition ∑Mdev / M0> = 0.75 at mixed ductility level could not be met.

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The condition ∑Mdev / M0> = 0.75 at mixed ductility level in X / Y direction could not be met.


According to article of TBDY , ductility level should be provided in mixed structural systems (4.3).

                                                              ∑ M DEV ≥ 0.75 M o                                                       (4.3)

Possible solutions:

  • Shearwall / shearwall group can be added to the 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.


M DEV = In reinforced concrete and steel composite structural systems, the sum of the tipping moments caused by earthquake loads at the base of the reinforced concrete walls with high ductility level bond beam (with or without gaps) and central, eccentric or buckling-prevented steel braced frames

M o = Total tipping moment at the base from earthquake loads for the entire building

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