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Dispersions for the pushover-based risk assessment of reinforced concrete frames and cantilever walls
Kosič, Mirko, gradbenik ; Dolšek, Matjaž ; Fajfar, Peter, 1943-
The paper presents the results of an investigation into the dispersion values, expressed in terms of limit-state spectral accelerations, which could be used for the pushover-based risk assessment of ...low-height to mid-height reinforced concrete frames and cantilever walls. The results of an extensive parametric study of a portfolio of test structures indicated that the dispersion values due to record-to-record variability and modelling uncertainty (ß ls,ru) are within the range from 0.3 to 0.55 for the near collapse limit state, and between 0.35 and 0.60 for the collapse limit state. The dispersions (ß ls,ru) proposed for the code-conforming and the majority of old (non code-conforming) frames are in between these values. On the other hand, the dispersions proposed for the old frames with a soft storey and an invariant plastic mechanism, and for the code-conforming cantilever walls, are at the lower and upper bounds of the presented values, respectively. The structural parameters that influence these dispersions were identified, and the influence of different ground motion sets, and of the models used for the calculation of the rotation capacities of the columns, on the calculated fragility parameters was examined and quantified. The proposed dispersion values were employed in a practice-oriented pushover-based method for the estimation of failure probability for eight selected examples. The pushover-based risk assessment method, although extremely simple and economical when compared with more rigorous probabilistic methods, was able to predict seismic risk with reasonable accuracy, thus showing it to be a practical tool for engineers.
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