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|Title:||A viscous-cohesive model for concrete fracture in quasi-static loading rate|
|Author:||Santos, Fábio Luis Gea dos|
Sousa, José Luiz Antunes de Oliveira e
|Abstract:||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|
|Appears in Collections:||FEC - Artigos e Outros Documentos|
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