Static nonlinear analysis of a retrofitted typical reinforced concrete building in Turkey

In this study, an attempt has been done for investigating the seismic behavior of a typical existing building in Turkey by performing static pushover analysis before and after retrofitting the columns either by reinforced concrete or carbon fiber reinforced polymer (CFRP) composite jackets. The selected model building represents nearly all typical construction deficiencies of buildings constructed before recent earthquake resistant design codes. According to the results of the structural analysis, significantly larger lateral displacement and slightly higher lateral strength with respect to original performance are possible by jacketing the columns of the building with CFRP sheets. On the other hand, in the case of reinforced concrete jacketing, the lateral strength and stiffness were significantly increased, as well as remarkable improvement of the lateral displacement capacity. Similarly, cross-sectional analysis performed through derivation of moment-curvature relationships showed that, an increase in ductility was much pronounced for CFRP jacketing while improvement in lateral strength was remarkable for reinforced concrete jacketing.