Fracture Properties of FRC Determined through Inverse Analysis of Wedge Splitting and Three-Point Bending Tests

Abstract

Fracture properties of five different steel fibre-reinforced concretes have been determined, using the wedge splitting test method (WST) and three-point bending tests (3PBT). Furthermore, for the WST method, two different specimen sizes have been investigated. Through inverse analyses, stress-crack opening ( -w) relationships have been determined for each mix and test method. Results from this investigation demonstrate the applicability of the WST method, show that inverse analysis can be used to determine stress-crack opening relationships, and the result demonstrate the effect of increased fibre content and the w/b-ratio. The major factor contributing to the differences in the determined stress-crack opening relationships is believed to be related to the variation in the number of fibres across the fracture plane. However, taking this into consideration, the inverse analyses indicate no systematic differences in the determined parameters between two WST specimen sizes, while the 3PBT seems to give slightly higher post-cracking stresses.

Development of an inverse analysis procedure for the characterisation of softening diagrams for FRC beams and panels

“…For the analyses of existing structures using advanced tools based on the finite element method, the r À W free shapes are more appropriate as they allow reproducing local effects. This is in agreement with Löfgren et al [9] and Jansson et al [19] research work findings. It is for interest to mention that this procedure is implemented in special purpose computer programmes using the FORTRAN 95 language.…”

“…determined automatically without additional efforts from the users. It is noteworthy that most available methods are using data fitting techniques [8,9] combined in some occasions with optimisation algorithms [10], for which the shape of the r À W diagram is either fixed a priori or free to vary. In all cases, an analytical formulation that uses the r À W curve as the input and provides the analytical load-displacement response is needed to match with the experimental results.…”

Biaxial Fracture Behaviour of Steel-Span and Steel-Fibre- Reinforced Concrete

“…This CMOD has been chosen, as this is a usual value for fibre concrete according to the literure (e.g. Löfgren et al 2005).…”

Fibre‐reinforced concrete in fib Model Code 2010: principles, models and test validation

“…It should be noted that triangular elements introduce a non-negligible increase in toughness. The simplified models introduced can sometimes be substituted by more complex models identified by means of back-analysis [57]. With reference to mesh 1 (Fig.…”