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For DTS = 4, Mdev / Mo> = 0.75 must be provided.

The Complete Message:

In earthquake design class (DTS) 3 or 4 unidirectional geared reinforced concrete structural systems, the condition Mdev / Mo> = 0.75 must 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.

  • If the building height class is BYS> = 7, a solution can be made by selecting A31 .


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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