In the performance analysis of existing buildings, three damage cases and damage limits are defined at the section level for ductile elements. These are Limited Damage (IO), Controlled Damage (LF) and Pre-Collapse Damage (CP) states and their limit values. Performance evaluation of existing structures is made according to the damage areas of the sections. Damage zones of critical sections are defined as Limited Damage Zone, Significant Damage Zone , Advanced Damage Zone and Collapse Zone.
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While defining section damages , internal forces or deformations found by applying any of TBDY Section 15.5 linear calculation methods and Section 15.6 nonlinear calculation methods and earthquake calculation methods are compared with numerical values corresponding to section damage limits in 15.3.1and 15.3.2 . In this case, the Limit Damage (SH), Controlled Damage (KH) and Pre- Collapse Damage (LO) limit values of the plastic hinges are calculated and compared with the plastic rotation value. This process is done separately for all earthquake loading cases and the section damage zone is determined for the most unfavorable case.
In the picture below, the areas where plastic hinges are formed and the damage conditions are shown for an example structure. Here, the plastic hinge elements shown in pink mean that they are in the limited damage zone , the plastic hinge elements shown in yellow are in the advanced damage zone, and the plastic hinge elements shown in red are in the collapse zone .
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