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70. Inverse analysis of notched-beam test data for obtaining tensile stress-crack opening relation of fiber reinforced concrete



Title: 70. Inverse analysis of notched-beam test data for obtaining tensile stress-crack opening relation of fiber reinforced concrete
Author(s): J.L.A. de Oliveira e Sousa, R. Gettu
Paper category : conference
Book title: 6th International RILEM Symposium on Fibre Reinforced Concretes
Editor(s): M. di Prisco, R. Felicetti and G.A. Plizzari
Print-ISBN: 2-912143-51-9
e-ISBN: 2912143748
Publisher: RILEM Publications SARL
Publication year: 2004
Pages: 809 - 818
Total Pages: 10
Nb references: 28
Language: English


Abstract: The simulation of fracture processes in fiber concretes and the analysis of fiber reinforced concrete structures require the knowledge of the fundamental cohesive stress versus crack opening displacement curve (s-w). Difficulties with the tension test for directly obtaining the s-w curves necessitate alternative procedures based on the inverse analysis of data from simpler test configurations. In this paper, an inverse analysis procedure is described for obtaining s-w curves from three-point bending tests performed on notched prismatic specimens. A s-w curve, with a user-defined shape, is fitted so that the experimentally-obtained load versus crack mouth opening displacement (P-CMOD) curve is matched. An object-oriented software program has been developed for obtaining the parameters of the s-w curve by minimizing the error between the experimental and numerical data using a least-squares approach. The procedure has been validated through a parametric study based on results obtained from tests of steel fiber reinforced concrete beams. The s-w curves obtained from the inverse analysis are compared with data from uniaxial tension tests of cores of the same concrete.


Online publication: 2004-08-30
Publication type : full_text
Public price (Euros): 0.00