A viscous-cohesive model for concrete fracture in quasi-static loading rate

[Display omitted] •A power law model is proposed to introduce the influence of the crack opening rate on the cohesive stress curves.•As the loading rate increases, the proposed model accounts for changes in the apparent material behavior to simulate the brittleness increase.•An inverse analysis stra...

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Bibliographic Details
Published in:Engineering fracture mechanics 2020-04, Vol.228, p.106893, Article 106893
Main Authors: Gea dos Santos, Fábio Luis, Sousa, José Luiz Antunes de Oliveira e
Format: Article
Language:English
Subjects:
Cohesion
Computer simulation
Fiber reinforced polymers
High strength concretes
Loading rate
Reinforced concrete
Reinforcing steels
Steel fiber reinforced concretes
Steel fibers
Time dependence
Viscous-cohesive behavior
Viscous-cohesive model
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Summary:[Display omitted] •A power law model is proposed to introduce the influence of the crack opening rate on the cohesive stress curves.•As the loading rate increases, the proposed model accounts for changes in the apparent material behavior to simulate the brittleness increase.•An inverse analysis strategy is implemented in a computer code to adjust the viscous-cohesive parameters of the proposed model from notched prismatic specimen subjected to three-point bending tests.•Results show a good agreement for conventional, high strength and ultra-high strength concrete specimens.•Concrete reinforced with polypropylene fiber and steel fiber showed good agreement up to the peak load. This paper describes a strategy to introduce time-dependent effects in a model to simulate the viscous-cohesive behavior of concrete in quasi-static conditions. Power laws are used to modify cohesive stresses according to the fracture opening rate. As rates increase, the proposed model accounts for changes in the apparent material behavior to simulate the increase in brittleness. With a computer code developed in C++ to adjust cohesive and viscous-cohesive models by inverse analysis, experimental tests on specimens of different types of concrete at different loading rates are used to evaluate the proposed model. The model is proposed for plain concrete and the results show a good agreement with conventional, high strength and ultra-high strength concretes. Data from fiber-reinforced concretes are used the verify the limits of the proposed model. Results with polypropylene fiber reinforced concrete show a reasonable agreement. Application to steel fiber reinforced concretes exhibited distinct post-peak behaviors because of steel fiber behavior at different loading rates.
ISSN:0013-7944
1873-7315
DOI:10.1016/j.engfracmech.2020.106893