Hello, -Because the entered R and the Selected R coefficient are different The reason is Weak Floor (B1) irregularity. In the project, B1 irregularity occurs because the effective shearing area of the wall in the Mezzanine Floor is less than that of the 1st Floor. The program calculates the effective shearing areas of the wall from the wall loads entered on the beam. If the effective shearing area of the wall in the Mezzanine floor is larger You can intervene from the Akx, Aky columns in the Analysis / Floor Parameters / Irregularities tab. Note: You can also solve your project in its current form as the nth value does not fall below 0.6. You can review the TDY 2007 article 2.3.2.3 and Table 2.1 on the subject. Good work"hydrkrmn":3gsq2s70" said:I chose the R coefficient of 7, but the entered r : 7 is written, but it shows the selected r as 7, will this cause a problem. Thanks in advance.