When I use the Lee-Fenves model to study the damage of concrete structural, the compression fracture energy confused me,Many researchers study the fracture energy of concrete cased by tension, So how can I get the compression fracture energy. Is there some advises?
"Modeling of Inelastic Behavior of RC Structures Under Seismic Loads", editor: Benson P. Shing ASCE, SEI.p. 471-
and the related references contain satisfactory information.
However, for an approximate comparison of the fracture energies of various mixtures, the energy dissipated up to the "loosening point (minimum stress at which spontaneous crack propagation starts in uniaxial compressive loading)" up to post-peak strain for the same stress (obtained under strain-controlled conditions with a closed-loop testing system) may be used.
What do you mean by compression fracture energy? normally fracture energy defined by the area under tension part of the stress strain relationship. Why do you need to calculate the compression fracture energy and what is its physical meaning ?
What fracture energy should I use for concrete when modelling it in tension? Does it have any relation with concrete strength?
Yu Xiang,
I have studied this parameter experimentally. You should take care about its definitiion in this program that you are using. You can calculate the area under stress strain curve between the peak stress and the ultimate strain. You can either adopte a analytical stress strain curve to calculate it or you can use a experimental result. I would like to talk more about this with you.
Dear Yu,
In the calibration of the Concrete Damaged Plasticity (CDP), the stress vs. strain relationship must be carefully introduced, as well as other constitutive parameters. Fracture energy is associated with the process of cracking and fracturing the concrete. It can be determined following different procedures, which highlights the work of Hillerborg and other authors.
Recently the following article was published, which is an excellent guide for the calibration of the constitutive parameters of the CDP in ABAQUS. In this work the determination of the fracture energy is explained in detail.
B. Alfarah, F. López-Almansa, S. Oller, New methodology for calculating damage variables evolution in Plastic Damage Model for RC structures, Engineering Structures. 132 (2017) 70–86.
I hope this information is helpful,
Best regards,
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