Simplified Stochastic Analysis of Reinforced Concrete Frames under Seismic Loads

Abstract eng:
Proper seismic performance of a structure is highly dependent on the mechanical properties of structural materials. A stochastic analysis allows us to evaluate the effect of variability of such mechanical properties on seismic performance of structures. The goal of this investigation was to perform a simplified stochastic analysis of reinforced concrete frames under seismic loads. Simplified analyses were performed based on Point Estimate Method, considering compressive concrete strength (f´c) and reinforcement steel yield stress (fy) as independent stochastic variables. Some application examples are presented concerning reinforced concrete cross-sections, structural members and frame structures. Seismic performance of frame structures was evaluated with pushover analyses. Results obtained with Point Estimate Method were validated with results obtained with Monte Carlo Simulation Method. It was concluded that Point Estimate Method can be used to perform simplified probabilistic analyses of structures under seismic actions. More refined results can be obtained with Monte Carlo Simulation Method, which requires a greater amount of numerical evaluation of seismic responses.

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