To evaluate how damage indices reproduce the structural physical response the seismic performance of an 8-story 5-bay RC frame designed according to Eurocodes 2 /1/ and 8 /2/ has been deeply investigated in this work in two ways. First of all, the seismic non-linear behaviour of the frame for different accelerograms is thoroughly analysed making use of a spread plasticity beam model. The structural response is determined not only in terms of extreme values, to check the distribution of ductility requirements along the structural elements, but also tracing the sequence of formation and evolution of inelastic zones, to study the mechanisms of damage activation. Secondly, an assessment is made of local and global structural damage through some existing and proposed damage indices; global damage is also evaluated, adopting a procedure here proposed based upon the spread plasticity model results, through the time history of the first mode period for an "equivalent" linear structure. While local indices reproduce well the results provided by non-linear analyses, global indices in some cases fail to recognise high damage situations.
Nonlinear response and damage indices in the seismic analysis of an RC frame
MULAS, MARIA GABRIELLA;
2000-01-01
Abstract
To evaluate how damage indices reproduce the structural physical response the seismic performance of an 8-story 5-bay RC frame designed according to Eurocodes 2 /1/ and 8 /2/ has been deeply investigated in this work in two ways. First of all, the seismic non-linear behaviour of the frame for different accelerograms is thoroughly analysed making use of a spread plasticity beam model. The structural response is determined not only in terms of extreme values, to check the distribution of ductility requirements along the structural elements, but also tracing the sequence of formation and evolution of inelastic zones, to study the mechanisms of damage activation. Secondly, an assessment is made of local and global structural damage through some existing and proposed damage indices; global damage is also evaluated, adopting a procedure here proposed based upon the spread plasticity model results, through the time history of the first mode period for an "equivalent" linear structure. While local indices reproduce well the results provided by non-linear analyses, global indices in some cases fail to recognise high damage situations.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
