VALUTAZIONE DELLA CAPACITA' PER IL MIGLIORAMENTO E L'ADEGUAMENTO DI EDIFICI ESISTENTI IN C.A

The paper discusses the main aspects related to nonlinear behavior of RC existing buildings. Firstly, modeling criteria proposed in previous works are discussed starting from experimental tests performed on RC beam-to-column joints. Specimens were designed only for vertical loads with smooth bars and are representative of existing buildings constructed in Italy between 1950s and 1970s. Afterwards, the proposed analytical models are applied for evaluating the nonlinear response of a typical RC existing structure. Comparisons among different modeling criteria by applying capacity models indicated in the Italian seismic code (D.M. 14/01/2008) are shown, as well.