The rules for earthquake calculation in linear performance analysis and nonlinear performance analysis applied in existing structures are defined in TBDY 15.4 . While defining the earthquake effects in the performance analysis, the structural system behavior coefficient, the excess strength coefficient and the building importance factor are not applied (R=D=I=1). Component capacities are determined according to the existing material strengths and building information level coefficients. The building performance evaluation is made according to the results obtained with the existing material strengths calculated by taking into account the earthquake calculation made using rod and shell finite elements and the knowledge level coefficient, within the framework of the rules specified in TBDY 15.4 .
15.4. GENERAL PRINCIPLES AND RULES ON EARTHQUAKE ACCOUNT
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