Cohesive-frictional modelling of bond and splitting action of prestressing wire

This work shows a numerical procedure for bond between indented wires and concrete, and the coupled splitting of the concrete. The bond model is an interface, non-associative, plasticity model. It is coupled with a cohesive fracture model for concrete to take into account the splitting of such concrete. The radial component of the prestressing force, increased by Poisson’s effect, may split the surrounding concrete, decreasing the wire confinement and diminishing the bonding. The combined action of the bond and the splitting is studied with the proposed model. The results of the numerical model are compared with the results of a series of tests, such as those which showed splitting induced by the bond between wire and concrete. Tests with different steel indentation depths were performed. The numerical procedure accurately reproduces the experimental records and improves knowledge of this complex process.

An analytical model for simulating the bond of prestressed concrete during the prestressed force release

A bond analytical model is proposed in this paper. The model is capable of reproducing the bond stress developed between the steel and concrete, in precast prestressed elements, during the entire process of prestressing force release. The bond stress developed in the transmission zone, where the bond stress is not constant, is also obtained. The steel and concrete stresses as well as the slip between both materials can be also estimated by means of the relation established in the model between these parameters and the bond stress. The model is validated with the results of a series of tests, considering different steel indentation depths and concrete covers and it is extended to evaluate the transmission length. This has been checked by comparing the transmission length predicted by the model and one measured experimentally in two series of tests.

An analytical model for simulating the bond of prestressed concrete during the prestressed force release

A bond analytical model is proposed in this paper. The model is capable of reproducing the bond stress developed between the steel and concrete, in precast prestressed elements, during the entire process of prestressing force release. The bond stress developed in the transmission zone, where the bond stress is not constant, is also obtained. The steel and concrete stresses as well as the slip between both materials can be also estimated by means of the relation established in the model between these parameters and the bond stress. The model is validated with the results of a series of tests, considering different steel indentation depths and concrete covers and it is extended to evaluate the transmission length. This has been checked by comparing the transmission length predicted by the model and one measured experimentally in two series of tests.

Experimental and numerical study of bond response in structural concrete with corroded steel bars

Corrosion can affect the bond between reinforcing bars and concrete and hence the transfer of longitudinal stresses. Although a number of experimental studies on bond failure have been conducted in recent years, the findings have diverged rather widely, due primarily to differing test conditions. The present paper reports on an experimental programme consisting of eccentric pull-out tests run on corroded steel bars in specimens subjected to accelerated or natural corrosion. An axisymmetric bi-dimensional FE model with finite deformations initially developed to study bond mechanics with sound steel bars, has been enhanced to consider bond effects in corroded steel bars. The model simulation is compared to some of the experimental results for corroded and sound bars and the findings are analysed.

Valence [Material gráfico]

Inscripción en la parte superior: "France Militaire, f. 37"

Valence [Material gráfico]

Resumen: Descripción: vista tomada desde la plaza del mercado con la Lonja a la derecha y la iglesia de los Santos Juanes a la izqda.

Valence [Material gráfico] : Mercado de Valencia

Huella recortada

Porte du Grao à Valence [Material gráfico]

Resumen: Descripción: vista tomada desde el plano del Real

Porte du Grao à Valence [Material gráfico]

Resumen: Descripción: vista de Valencia tomada desde el plano del Real

Interieur de la Halle aux Soies à Valence [Material gráfico]

Resumen: Descripción: vista del interior del salón columnario de la Lonja

Habitations de Pecheurs sur la Cote de Valence [Material gráfico]

Resumen: Descripción: vista de grupo pescadores en la costa

Vista de Valencia tomada del lugar de Burjasot [Material gráfico] =Vue de Valence prise du village de Burjasot = View of Valencia taken from the village of Burjasot

Resumen: Descripción: vista de la ciudad de Valencia desde Burjassot

Varias inscriptiones que se hallan en el Reyno de Valencia [Material gráfico] =Inscriptiones trouvées dans le Royaume de Valence= Various Inscriptions founded in the Kimgdom of Valencia

Datos de publicación tomados de la obra a la que pertenece

Vista de la puerta de Serranos de Valencia [Material gráfico] =Vue de la Porte de Serranos à Valence=View of the Gate of Serranos at Valencia

Datos de publicación tomados de la obra a la que pertenece

Vista de la Alameda, paseo de Valencia [Material gráfico] =Vue de la Alameda de Valence=View of the Alameda, apublic coalk at Valencia

Datos de publicación tomados de la obra a la que pertenece