Abstract
In this study, several simplified constitutive models and a damage plasticity model for ultra-high performance fiber reinforced concrete(UHPFRC)material with micro and hooked ends steel fibers, Bekaert Dramix 5D steel fiber, and Forta-Ferro synthetic fiber had been developed. Later, these constitutive and damage plasticity models were applied as analytical model to numerically simulate the concrete members with different fibers, and to evaluate the behavior of the concrete sections. The constitutive models for UHPFRC of three mix designs were obtained experimentally by conducting uniaxial compression and tensile tests on both cylinder and dog-bone specimens. Next, a comparison was made among the three mix designs based on the outcomes retrieved from uniaxial compression and tensile stress–strain. These results were validated by numerically analyzing three hollow circular columns via finite element method. The numerical results revealed that the proposed material model possessed appropriate tensile strain-hardening behavior and uniaxial compression strengths of UHPFRC with different types of fiber. The lateral resistance responses of the tested hollow sections, which were obtained by using developed constitutive and damage plasticity models, displayed exceptional agreement with the experimental outcomes.
Highlights
Ultra-high performance concrete (UHPC) refers to an innovative concrete that is defined based on multiple criteria (Naaman and Wille 2012; Rossi 2008)
The need for durability, ductility, and workability has led to the development of UHPC and Ultra-high performance fiber reinforced concrete (UHPFRC) (El-Dieb 2009; Hassan et al 2012; Rossi 2013)
In order to simulate the UHPFRC material using finite element method, simplified constitutive and damage plasticity models for UHPFRC material with micro and hooked ends steel fibers, Bekaert Dramix 5D steel fiber, and Forta-Ferro synthetic fiber were developed. Both uniaxial compression and tensile tests were performed on cylinder and dog-bone specimens that had been casted using the selected fibers
Summary
Ultra-high performance concrete (UHPC) refers to an innovative concrete that is defined based on multiple criteria (Naaman and Wille 2012; Rossi 2008). In order to simulate the UHPFRC material using finite element method, simplified constitutive and damage plasticity models for UHPFRC material with micro and hooked ends steel fibers, Bekaert Dramix 5D steel fiber, and Forta-Ferro synthetic fiber were developed For this purpose, both uniaxial compression and tensile tests were performed on cylinder and dog-bone specimens that had been casted using the selected fibers. Isotropic damaged elasticity after tensile and compressive tests were used to develop a concrete damage plasticity model. Figure presents the uniaxial tensile and compressive responses of the concrete influenced by the damaged plasticity behavior This assumption was applied in the concrete damage plasticity model to develop compression and tension load, as expressed in Eqs. 5.2 Uniaxial Tensile Behavior The plastic hardening strain in tension εtpl,h portrayed in Fig. 7b is given in Eqs.
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