Article: The influence of degradation phenomena on collapse modes in prestressed concrete beams Journal: International Journal of Lifecycle Performance Engineering (IJLCPE) 2012 Vol.1 No.1 pp.41 - 63 Abstract: The static capacities of reinforced and prestressed concrete beams are characterised through their failure modes, which describe the internal force redistribution as well as the kinematic evolution which leads to the collapse of the structure. For a given structural element, a change in material and/or sectional characteristics due, for instance, to damaging effects induced by environmental aggressive agents, may change the element behaviour. In this paper, a computational approach, suitable to deal with the analysis of R.C. and P.C. concrete elements with steel bars and/or tendons subjected to corrosion is presented. The effects of the diffusion of aggressive agents, of the onset and of the development the corrosion state in the reinforcement and the corresponding mechanical response are studied. The damage development and the mechanical behaviours are dealt as coupled phenomena. A set of comparative applications shall demonstrate how in P.C. beams, the corrosion could switch a collapse of flexural type to one of shear type. Inderscience Publishers - linking academia, business and industry through research

Title: The influence of degradation phenomena on collapse modes in prestressed concrete beams

Authors: Luca Sgambi; Pier Giorgio Malerba; Giordano Gotti; Diego Ielmini

Addresses: Department of Structural Engineering, Politecnico di Milano, Piazza L. da Vinci, 32, 20133, Milano, Italy ' Department of Structural Engineering, Politecnico di Milano, Piazza L. da Vinci, 32, 20133, Milano, Italy ' Department of Structural Engineering, Politecnico di Milano, Piazza L. da Vinci, 32, 20133, Milano, Italy ' Department of Structural Engineering, Politecnico di Milano, Piazza L. da Vinci, 32, 20133, Milano, Italy

Abstract: The static capacities of reinforced and prestressed concrete beams are characterised through their failure modes, which describe the internal force redistribution as well as the kinematic evolution which leads to the collapse of the structure. For a given structural element, a change in material and/or sectional characteristics due, for instance, to damaging effects induced by environmental aggressive agents, may change the element behaviour. In this paper, a computational approach, suitable to deal with the analysis of R.C. and P.C. concrete elements with steel bars and/or tendons subjected to corrosion is presented. The effects of the diffusion of aggressive agents, of the onset and of the development the corrosion state in the reinforcement and the corresponding mechanical response are studied. The damage development and the mechanical behaviours are dealt as coupled phenomena. A set of comparative applications shall demonstrate how in P.C. beams, the corrosion could switch a collapse of flexural type to one of shear type.

Keywords: reinforced concrete structures; prestressed concrete structures; carbonation; chloride attack; corrosion; durability; degradation; collapse modes; prestressed concrete beams; reinforced concrete beams; failure modes; structural collapse; steel bars; tendons; structural failure.

DOI: 10.1504/IJLCPE.2012.051280

International Journal of Lifecycle Performance Engineering, 2012 Vol.1 No.1, pp.41 - 63

Received: 02 Mar 2011
Accepted: 08 Sep 2011
Published online: 17 Sep 2014 *

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Title: The influence of degradation phenomena on collapse modes in prestressed concrete beams

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