Seismic performances of RC frame structures can be evaluated using very refined and complex local models or simplified global models. The limitation of the simplifled global models is their inability to simulate the local behaviour of critical regions and yield accurate estimates of strain and curvature ductilities. On the other hand, the high computational cost associated with refined finiteelement models is a clear impediment in their use in large dynamic simulations. The seismic performance analyses presented in this paper are conducted with an intermediate model that can be utilized with some success for, both, global response studies of high-rise RC frames and local response studies of structural elements. The model is based on the decomposition of a frame member into different subelements. Each subelement describes a different deformation mechanism that affects the hysteretic behaviour of critical regions in girders and columns. Such an intermediate model can be really suitable for carrying out Performance Based Seismic Design (PBSD) procedures in a reliable manner. In particular, one of the main feature of this multi-component model is its ability to include in the simulations joint liexibility due to bar pull-out at the beam-column and column-foundation interface. Herein, effects of such enhanced modelling are evaluated in a PBSD format by comparing the predictions of interstorey drifts and plastic rotations with the limits provided by FEMA 356. The performance analyses are conducted on a three bay four story RC frame designed according to Eurocode 8 and subjected to the suite of 20 accelerograms generated within the SAC Steel Project for the Los Angeles area, having a probability of exceedance of 10% in 50 years. The obtained results demonstrate. that inclusion of bar pull-out influences significantly the two considered response parameters, i.e. interstorey drifts and plastic rotations, regarding both values and distribution throughout frame members.
Investigation on seismic performances of RC frames with refined multi-component modelling / A. D'Ambrisi; M. De Stefano; M. Tanganelli. - ELETTRONICO. - (2006), pp. 1-8. (Intervento presentato al convegno First European Conference on Earthquake Engineering and Seismology tenutosi a Geneva, Switzerland nel 3-8 September 2006).
Investigation on seismic performances of RC frames with refined multi-component modelling
D'AMBRISI, ANGELOMembro del Collaboration Group
;DE STEFANO, MARIOMembro del Collaboration Group
;TANGANELLI, MARCOWriting – Original Draft Preparation
2006
Abstract
Seismic performances of RC frame structures can be evaluated using very refined and complex local models or simplified global models. The limitation of the simplifled global models is their inability to simulate the local behaviour of critical regions and yield accurate estimates of strain and curvature ductilities. On the other hand, the high computational cost associated with refined finiteelement models is a clear impediment in their use in large dynamic simulations. The seismic performance analyses presented in this paper are conducted with an intermediate model that can be utilized with some success for, both, global response studies of high-rise RC frames and local response studies of structural elements. The model is based on the decomposition of a frame member into different subelements. Each subelement describes a different deformation mechanism that affects the hysteretic behaviour of critical regions in girders and columns. Such an intermediate model can be really suitable for carrying out Performance Based Seismic Design (PBSD) procedures in a reliable manner. In particular, one of the main feature of this multi-component model is its ability to include in the simulations joint liexibility due to bar pull-out at the beam-column and column-foundation interface. Herein, effects of such enhanced modelling are evaluated in a PBSD format by comparing the predictions of interstorey drifts and plastic rotations with the limits provided by FEMA 356. The performance analyses are conducted on a three bay four story RC frame designed according to Eurocode 8 and subjected to the suite of 20 accelerograms generated within the SAC Steel Project for the Los Angeles area, having a probability of exceedance of 10% in 50 years. The obtained results demonstrate. that inclusion of bar pull-out influences significantly the two considered response parameters, i.e. interstorey drifts and plastic rotations, regarding both values and distribution throughout frame members.
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