Reliability Updating of Deteriorating Concrete Floor Slabs

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Title: Reliability Updating of Deteriorating Concrete Floor Slabs

Author(s): T. J. DaSilva and P. Roca

Publication: Special Publication

Volume: 186

Issue:

Appears on pages(s): 525-536

Keywords: carbonation; chloride penetration; concretes; corrosion; slabs

Date: 5/1/1999

Abstract:
The main objective of this paper is to propose a method to estimate the probability of failure of building concrete floor slabs using a probabilistic treatment of the most influencing geometrical, material or environmental variables. The estimation of probability of failure results through an stochastic simulation of the material degradation of the slab with time and the variation of the loads applied. Consequently, the progressive increase of the probability of failure is pictured. This value is the additional information for to decide the appropriate level for the reparation. The presented method treats as random variables these basic ones taking part in the carbonation process, chloride penetration and corrosion. Distribution of degradation, obtain the ultimate response oft the slab at any time and then compare it with the acting loads, which are at their turn obtained through an stochastic treatment. The employment of the first order reliability moment (FORM) is used to estimate the probability of failure either for a part or for the entire slab.