The Complete Message:
A31 structural system can only be used in buildings with Earthquake design class (DTS) 3 or 4.
A31 type structural system TBDY 2018 is defined in Table 4.1 as buildings where all earthquake effects are met with moment-transferring reinforced concrete frames with limited ductility level .
TBDY 2018 4.3.4.3 by the substance transfer torque entire seismic effects ductility limited structural system are met with reinforced concrete frame ( Table 4.1 from A31 , B31 , C31 conveyor systems) will be used only in buildings with DTS = 3 and DTS = 4.
Structural systems with limited ductility level cannot be used in buildings classified as DTS = 1a, DTS = 2a, DTS = 3a and DTS = 4a according to 4.3.4 a .
According to 4.3.4 b article, ductility level mixed load bearing systems cannot be used in buildings with BYS <= 6 and classified as DTS = 1a and DTS = 2a .
For this reason, A31 selection cannot be made in structures with earthquake design class DTS = 1, 1a, 2, 2a, 3a, 4a.
Possible solutions:
Solution can be made by choosing high ductility level.
If BYS> = 3, buildings without shearwall can be selected as A11.
If BYS> = 2, the building can be selected as A14 or A15 , taking into account the conditions given in Article 4.3.4.5 .
If the building height class is DMS> = 6, the solution can be made by selecting the ductility level mixed.
Considering the conditions given in 4.3.4.5, one of the structural systems A21 or A22 can be selected.