Performance analysis of an existing reinforced concrete building with linear and non-linear analysis methods

In this study, we aim to evaluate performance of an existing reinforced concrete building using different analysis methods, such as linear and nonlinear methods and compare its results accordingly to highlight the importance of choosing the appropriate analysis method in performance evaluation of existing buildings. For this study we examined an existing reinforced concrete building located in İskenderun. Analysis models were created in accordance with the building's existing architectural and structural formwork plans. Missing data was completed by considering the minimum requirements of relevant codes and standards. The Modal Response Spectrum Method was used as the linear analysis method, while nonlinear analysis methods included Modal Pushover Analysis and Time History Analysis based on modal solution type. The current condition of the structure was evaluated within the framework of the Turkish Building Earthquake Code 2018 (TBEC-2018). According to linear modal response spectrum analysis method, the structure was generally evaluated at the Controlled Damage Performance Level. As a result of the nonlinear modal pushover analysis, it was determined that the structure was generally evaluated at the Collapse State Performance Level. Based on this nonlinear time history analysis, the structure was evaluated at the Controlled Damage Performance Level. Significant differences were observed between the performance levels obtained using different analysis methods. This highlights that the choice of analysis method has a direct impact on the assessment of structural safety. This study highlights the comparative results of various methods that can be used in the performance analysis of existing structures and emphasizes the importance of selecting the appropriate method.