Nonlinear performance assessment of rc buildings based on displacement design by implementing tsc2018 with comparison to the eurocode

Turkey is located in an active seismic zone where it has been suffered great losses in economy and souls. As a result of site investigations that have been conducted after earthquakes, it has been concluded that many buildings had not been designed according to codes and regulations. It was also seen that the strength of the concrete used is very low in addition to the presence of many defects in buildings which decreased the buildings' resistance to earthquakes. To avoid these risks, the issue of evaluating the performance of a building and retrofitting has received great attention in recent years. The common methods used to evaluate the performance of buildings are nonlinear static and dynamic methods. In this study, the performance evaluation of buildings has been done by using nonlinear methods. For this purpose, nonlinear analysis and pushover analysis methods were used. Both Turkish seismic code (TSC2018) and Euro-code (EC8) rules have been considered comparatively for sample rc frames and a building. The sample building has a serious torsion problem where the stiffness center does not match with the mass center. In addition to the torsion problem, the effect of low-strength concrete on performance was also investigated. The results have proved that implementing both codes the TSC2018 and the EC8 yield similar results. Nonetheless, the only difference between these two cases is the definition of the effective section stiffness and the definition of the plastic hinge, however, the difference remains at the minimum level. In addition, it has been determined that the building performance decreases when the concrete strength decreases. Furthermore, it was found that the decline in performance when the concrete strength decreases from C20 to C10 is much greater than the case in which the concrete strength decreases from C40 to C20. Bearing in mind that the frame that has been studied in this case was multi-storey. Therefore the effects of the weaknesses in the structure on the performance may differ according to the number of floors. Lastly, it has been aimed that the obtained results will be guides and references for the project design engineers. Keywords: Nonlinear analysis, TSC 2018, EC8, Pushover analysis, Displacement base design