Seismic fragility of RC frame and wall-frame dual buildings designed to EN-Eurocodes

TitleSeismic fragility of RC frame and wall-frame dual buildings designed to EN-Eurocodes
Publication TypeThesis
Year of Publication2013
Antoniou K
Thesis TypeMSc

Fragility curves are constructed for structural members of regular reinforced concrete frame and wall-frame buildings designed according to Eurocode 2 and Eurocode 8. Prototype plan- and height- wise very regular buildings are studied with parameters including the height of the building, the level of Eurocode 8 design (in terms of design peak ground acceleration and ductility class) and for dual systems the percentage of seismic base shear taken by the walls.
Member fragility curves are constructed based on the results of nonlinear static (pushover) analysis (SPO) and incremental dynamic analysis (IDA) using 14 spectrum-compatible semi-artificial accelerograms. Analysis is performed using three-dimensional structural models of the full buildings. These results are compared to fragility curves obtained from previous studies for a simplified analysis method using the lateral force method (LFM).
The fragility curves are addressed on two member limit states; yielding and the ultimate deformation in bending or shear. The peak chord rotation and peak shear force demands at member ends are taken as damage measures; the peak ground acceleration (PGA) is used as seismic intensity measure. The probability of exceedance of each limit state is computed from the probability distributions of the damage measures (conditional on intensity measure) and of the corresponding capacities.
The alternative methods yield results that are in good agreement for beams and columns in both frame and dual buildings and for the flexural behavior of walls. Results from the simplified procedure using the LFM shows that Medium Ductility Class walls are likely to fail in shear even before their design PGA. The dynamic analysis confirms to a certain extend the inelastic amplification of shear forces due to higher mode effects and shows that the relevant rules of Eurocode 8 are on the conservative side.

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