15.3.3
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.
The section Damage Area is automatically determined according to the section damage conditions of the plastic hinges.
Section Damage Area is automatically determined according to the section damage of plastic hinges .
According to all loading conditions in the ŞGDT approach, the section damage limits and section damage zones of the elements are determined automatically according to the most unfavorable situation.
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 15.3.1 and 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 plastic hinges shown in green are in the Limited Damage Zone (IO) , plastic hinges in blue are in the Significant Damage Zone (BH) , plastic hinges in yellow are in the Advanced Damage Zone (IH) and plastic hinges in red are in the Failure Zone Calculated in ( GB) .
In the picture below, the damage conditions resulting from the distributed plastic behavior model in which the curtains are defined are shown for an example structure. Here , the elements shown in green are calculated in the Limited Damage Zone (IO) and the elements shown in blue are in the Significant Damage Zone (BS) . The elements shown in yellow mean that they are calculated in the Advanced Damage Zone (IH) and the elements in red are calculated in the Failure Zone (SW) .
