• Basement curtains are modeled linearly.

  • Slabs are modeled linearly.

  • The effective cross-section stiffness of the floor and basement walls is determined automatically.


Under normal conditions, under the influence of earthquake loads, plastic deformation is not expected in floors and basement walls. For this reason, floors and basement walls are modeled with linear shell finite elements (shell) and the effective section stiffnesses are determined according to the coefficients marked in red in the picture below according to TBDY Table 4.2 .

Basement walls are modeled with shell finite elements in accordance with TBDY Article 4.5.3.7 . According to Article 5.4.4 of TBDY , basement walls are defined in accordance with the modeling rules applied in Section 4.5.5 , ie the DOT approach. It is explained in detail under the heading of "Modeling Basement Curtains" .

Modeling of Basement Curtains

4.5.5.1 - Basement curtains arranged all around in buildings with basements are structural system elements that take all or most of the inertia forces that occur in the upper floors with transition floors (See 4.5.7) and transfer them to the foundation and at the same time meet the ground impulses in an earthquake.

4.5.5.2 - Basement walls shall be modeled with shell finite elements according to 4.5.3.7.