Subset Simulation is an advanced simulation procedure which is efficient for calculating the small failure probabilities corresponding to structural limit states. Moreover, it is robust with respect to the number of uncertain parameters in the problem and it is applicable to any type of structural model and any loading. Reinforced concrete structures are a particular case in which the effect of structural modelling uncertainties could be considerable. This study presents an application of the Subset Simulation technique to the seismic assessment of an "old-design" RC frame structure taking into account both ground motion and structural modelling uncertainties. The structure selected for the application is an 8-storeys RC plane frame designed for conventional seismic actions without modern-code detailing and ductility provisions. The uncertainty in members' shear strength, yield and ultimate chord rotation capacities is accounted for. The uncertainty in the material modelling parameters such as concrete strength and steel yield and ultimate stress is also included. The probabilistic representation for the ground motion time-history is constructed based on a stochastic ground motion model and on the joint distribution of magnitude and distance for the site, as obtained from the de-aggregation of seismic hazard. The performance of the structure is measured in terms of a system-level scalar damage measure that accounts for a set of possible failure modes of the structure. The effect of the uncertain structural modelling parameters on the first-passage probabilities associated with the structural performance variable is studied. Finally, the results of Subset simulation are post-processed in order to generate fragility curves which are bench-marked against the fragility curves obtained directly based on structural response to a small set of scaled recorded motions taking into account the same set of structural modelling uncertain parameters.
Structural Modeling Uncertainty in Seismic Reliability Analysis of RC Frames: Use of Advanced Simulation Methods / Jalayer, Fatemeh; Franchin, Paolo; Pinto, Paolo Emilio. - STAMPA. - (2007). (Intervento presentato al convegno COMPDYN'07 tenutosi a Rethymno, Crete nel 13-16/6/2007).
Structural Modeling Uncertainty in Seismic Reliability Analysis of RC Frames: Use of Advanced Simulation Methods
JALAYER, FATEMEH;FRANCHIN, Paolo;PINTO, Paolo Emilio
2007
Abstract
Subset Simulation is an advanced simulation procedure which is efficient for calculating the small failure probabilities corresponding to structural limit states. Moreover, it is robust with respect to the number of uncertain parameters in the problem and it is applicable to any type of structural model and any loading. Reinforced concrete structures are a particular case in which the effect of structural modelling uncertainties could be considerable. This study presents an application of the Subset Simulation technique to the seismic assessment of an "old-design" RC frame structure taking into account both ground motion and structural modelling uncertainties. The structure selected for the application is an 8-storeys RC plane frame designed for conventional seismic actions without modern-code detailing and ductility provisions. The uncertainty in members' shear strength, yield and ultimate chord rotation capacities is accounted for. The uncertainty in the material modelling parameters such as concrete strength and steel yield and ultimate stress is also included. The probabilistic representation for the ground motion time-history is constructed based on a stochastic ground motion model and on the joint distribution of magnitude and distance for the site, as obtained from the de-aggregation of seismic hazard. The performance of the structure is measured in terms of a system-level scalar damage measure that accounts for a set of possible failure modes of the structure. The effect of the uncertain structural modelling parameters on the first-passage probabilities associated with the structural performance variable is studied. Finally, the results of Subset simulation are post-processed in order to generate fragility curves which are bench-marked against the fragility curves obtained directly based on structural response to a small set of scaled recorded motions taking into account the same set of structural modelling uncertain parameters.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
