In the performance analysis of existing buildings (linear and non-linear), effective section stiffnesses are determined according to TBDY Table 4.2 .
The effective section stiffnesses are determined automatically according to 4.5.8 .
Effective cross-section stiffnesses in earthquake performance to be determined within the scope of evaluating existing buildings are made according to Table 4.2 specified in TBDY Section 4.5.8 .
