Shear Strength Degradation Induced by Seismic Action in R.C. Columns: Effects on Push-Over Analisys

Abstract eng:
Unfortunately, most of the interaction models have been formulated for monotonic increments of the actions. Therefore they don't take into account the effect of strength degradation due to external cyclic actions induced by the earthquake. Recently, the authors extended a model for N-M-V interaction domain evaluation of r.c. elements having rectangular cross-sections, already formulated for static loads, to the case of seismic actions. The new model is obtained by limiting the range of variability of the deviation angle between the directions of the stressfields and the cracks inclinations, as a function of the amplitude of the cyclic actions. In this paper the model is reformulated for r.c. elements having circular cross-sections. The evaluation of resistance domains for concrete bridge piers having current structural configuration highlight the increment of the risk level induced by shear strength degradation due to cyclic action. Lastly, a numerical example on actual motorway viaduct piers, where extensive experimental tests have been made for material characterization, is developed

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