Re: DIFFERENCE BETWEEN TBDY2018 AND PERFORMANCE ANALYSIS RESULTS Hello; I reviewed your project. First of all, I would like to give some information about linear performance analysis. Linear performance analysis is made by the method described in TBDY 15.5. Since this analysis is a SGDT approach, plastic rotations and plastic strains are found with an approximate linear method. For this reason, it may be more punishing than DGT analysis or other SGDT analyzes (such as pushover analysis, nonlinear analysis in the time history). When the "Vertical earthquake effect" and "Secondary earthquake direction" options are not selected from the linear performance analysis options, the structure comes out as KH. Best regards...