hello levent brother thank you you helped me yesterday but what is the logic of canceling this rigid creation or the logic of your other choice if I solve it without rote[/ quote] Hello, There is a special case of creating finite element meshes in your project in v10.17. This situation has been fixed in the soon-to-be released v10.18 version. You may want to remove the "rigid diaphragm creation" option, as there is an increase in the shear force of the columns due to low slabs in your project. I suggested that you give the floor level a value of -0.01 cm. Normally, it is not necessary to interfere with the rigid diaphragm forming conditions of the floors. Good work