This paper presents the main results of numerical analyses carried out to assess the seismic performance of reinforced concrete frames. In particular, the influence of the beam-to-column joint behaviour on the seismic response of existing RC frames, characterized by inadequate structural detailing to effectively withstand seismic loading, has been investigated. In the employed modelling approach for RC frames, the joint damage is represented using nonlinear rotational springs with limited ductility and with strength and stiffness degradation. A brief overview of the capacity models for joints in RC structures currently available in the technical literature is reported in the introductory section of the paper. Subsequently, some analytical details of the employed joint model, which has been calibrated considering several experimental results, are provided. Finally, the main results achieved in the numerical analyses are presented and discussed. Nonlinear static and dynamic analyses have been carried out, considering two, three and four-storey RC frames and accounting for material and geometric nonlinearity in beams and columns. The influence of potential damage in beam-to-column joints has been investigated, where the results achieved with the beam-to-column joints represented through nonlinear springs are compared against those obtained assuming rigid joints. The outcomes of the numerical study show that the overall vulnerability of the analysed RC frames is strongly affected by the beam-to-column joint damage.
Seismic performance of existing RC frames: influence of beam-to-column joint modelling
LIMA, CARMINE;MARTINELLI, Enzo;
2010-01-01
Abstract
This paper presents the main results of numerical analyses carried out to assess the seismic performance of reinforced concrete frames. In particular, the influence of the beam-to-column joint behaviour on the seismic response of existing RC frames, characterized by inadequate structural detailing to effectively withstand seismic loading, has been investigated. In the employed modelling approach for RC frames, the joint damage is represented using nonlinear rotational springs with limited ductility and with strength and stiffness degradation. A brief overview of the capacity models for joints in RC structures currently available in the technical literature is reported in the introductory section of the paper. Subsequently, some analytical details of the employed joint model, which has been calibrated considering several experimental results, are provided. Finally, the main results achieved in the numerical analyses are presented and discussed. Nonlinear static and dynamic analyses have been carried out, considering two, three and four-storey RC frames and accounting for material and geometric nonlinearity in beams and columns. The influence of potential damage in beam-to-column joints has been investigated, where the results achieved with the beam-to-column joints represented through nonlinear springs are compared against those obtained assuming rigid joints. The outcomes of the numerical study show that the overall vulnerability of the analysed RC frames is strongly affected by the beam-to-column joint damage.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.