Wei He - Academia.edu (original) (raw)
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Papers by Wei He
Computer Methods in Applied Mechanics and Engineering, 2008
ABSTRACT This paper proposes a constitutive model for predicting the response of reinforced concr... more ABSTRACT This paper proposes a constitutive model for predicting the response of reinforced concrete. Of specific interest is the realistic modeling of the hysteretic behavior of concrete under quasi-statically reversed cyclic loading. The significant cyclic features of concrete are described in the model using irrecoverable strains, crack closing and reopening, nonlinear unloading curves that represent the energy dissipation, and reloading curves with the degraded reloading stiffness that account for the damage. Partial unloading/reloading is also accounted for. The model is implemented in the context of the fracture energy based smeared rotating crack approach, and validated using measured data from experiments at both the material and structure levels. Case studies show that the model is more applicable and accurate in the nonlinear analysis of reinforced concrete structures than models with idealized hysteretic schemes.
Computer-Aided Civil and Infrastructure Engineering, 2009
To overcome the problem of debonding, a new hybrid-bonded fiber-reinforced polymers (HB-FRP) stre... more To overcome the problem of debonding, a new hybrid-bonded fiber-reinforced polymers (HB-FRP) strengthening system has recently been developed. This HB-FRP technique can increase the interfacial bond strength several folds. In this work, a finite element (FE) model for HB-FRP strengthened beams is developed to simulate the responses of the new structural system. The interfacial behaviors between the FRP and the concrete are simulated with a shear friction model. Comparisons between the predictions from this model and the test results demonstrate the accuracy of the FE model. The mechanism of the HB-FRP system and failure modes are then studied using the proposed model. C 2009 Computer-Aided Civil and Infrastructure Engineering.
International Journal of Engineering Science, 2006
We proposed a constitutive model for the two-dimensional analysis of concrete structures. The pro... more We proposed a constitutive model for the two-dimensional analysis of concrete structures. The proposed model treats concrete as an orthotropic nonlinear material. The equivalent principal strain based approach allows the model to represent the mechanical behavior of concrete by using two equivalent uniaxial stress-strain relations. The biaxial behavior of concrete is described using the concept of current strength in a principal stress space. The fracture energy method is incorporated to solve the problem of mesh non-objectivity, and the concept of current fracture energy gives an improved description of the post-peak behavior of concrete. Secant-stiffness-based finite-element formulations are implemented in a smeared rotating crack fashion. Correlative studies using available experimental test results are presented to demonstrate the performance of the model at a structural level.
Computer Methods in Applied Mechanics and Engineering, 2008
ABSTRACT This paper proposes a constitutive model for predicting the response of reinforced concr... more ABSTRACT This paper proposes a constitutive model for predicting the response of reinforced concrete. Of specific interest is the realistic modeling of the hysteretic behavior of concrete under quasi-statically reversed cyclic loading. The significant cyclic features of concrete are described in the model using irrecoverable strains, crack closing and reopening, nonlinear unloading curves that represent the energy dissipation, and reloading curves with the degraded reloading stiffness that account for the damage. Partial unloading/reloading is also accounted for. The model is implemented in the context of the fracture energy based smeared rotating crack approach, and validated using measured data from experiments at both the material and structure levels. Case studies show that the model is more applicable and accurate in the nonlinear analysis of reinforced concrete structures than models with idealized hysteretic schemes.
Computer-Aided Civil and Infrastructure Engineering, 2009
To overcome the problem of debonding, a new hybrid-bonded fiber-reinforced polymers (HB-FRP) stre... more To overcome the problem of debonding, a new hybrid-bonded fiber-reinforced polymers (HB-FRP) strengthening system has recently been developed. This HB-FRP technique can increase the interfacial bond strength several folds. In this work, a finite element (FE) model for HB-FRP strengthened beams is developed to simulate the responses of the new structural system. The interfacial behaviors between the FRP and the concrete are simulated with a shear friction model. Comparisons between the predictions from this model and the test results demonstrate the accuracy of the FE model. The mechanism of the HB-FRP system and failure modes are then studied using the proposed model. C 2009 Computer-Aided Civil and Infrastructure Engineering.
International Journal of Engineering Science, 2006
We proposed a constitutive model for the two-dimensional analysis of concrete structures. The pro... more We proposed a constitutive model for the two-dimensional analysis of concrete structures. The proposed model treats concrete as an orthotropic nonlinear material. The equivalent principal strain based approach allows the model to represent the mechanical behavior of concrete by using two equivalent uniaxial stress-strain relations. The biaxial behavior of concrete is described using the concept of current strength in a principal stress space. The fracture energy method is incorporated to solve the problem of mesh non-objectivity, and the concept of current fracture energy gives an improved description of the post-peak behavior of concrete. Secant-stiffness-based finite-element formulations are implemented in a smeared rotating crack fashion. Correlative studies using available experimental test results are presented to demonstrate the performance of the model at a structural level.