A Constitutive Model for Stud Connection in Composite Structures

The complexity of finite element analysis for composite structures can be significantly reduced by representing the connector and adjacent concrete as a macroscopic element. Nevertheless, the prevailing macroscopic models for shear connections predominantly employ nonlinear elastic theory. This appr...

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Vydáno v:Buildings (Basel) Ročník 14; číslo 4; s. 1018
Hlavní autoři: Qin, Xi, Zhao, Wei
Médium: Journal Article
Jazyk:angličtina
Vydáno: Basel MDPI AG 01.04.2024
Témata:
back Euler method
Composite structures
Concrete
consistent tangent stiffness
constitutive integration algorithm
Constitutive models
elastoplastic model
Elastoplasticity
Empirical analysis
Failure
Finite element analysis
Finite element method
Load
Load bearing elements
Macroscopic models
Mathematical models
Model testing
Numerical integration
Plasticity
Shear
Shear strength
Stiffness matrix
Strain hardening
stud connection
ISSN:2075-5309, 2075-5309
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Shrnutí:The complexity of finite element analysis for composite structures can be significantly reduced by representing the connector and adjacent concrete as a macroscopic element. Nevertheless, the prevailing macroscopic models for shear connections predominantly employ nonlinear elastic theory. This approach introduces inaccuracies in estimating structural stiffness and load-bearing capabilities, primarily due to its inability to precisely capture the cumulative effects of plastic damage. In response, this study introduces a novel macroscopic elastoplastic model grounded in plasticity theory, aimed at accurately characterizing the nonlinear behavior of stud connections subjected to concurrent shear and tensile forces. This paper meticulously delineates the implementation of the elastoplastic constitutive model using the backward Euler method for numerical integration. It further articulates the derivation of the consistent tangent stiffness, which aligns with the convergence efficiency of the Newton–Raphson iterative approach. The computation of the element stiffness matrix for a two-node element is executed via the governing equation inherent to the finite element method. An exemplar macroelement test conducted in ABAQUS affirms the implicit backward Euler scheme’s stability and consistency across varying tolerances. Validation of the elastoplastic model against empirical test outcomes corroborates its efficacy, demonstrating the model’s precision in predicting the load–displacement behavior of stud connections under the influence of shear and tensile forces.
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ISSN:2075-5309
2075-5309
DOI:10.3390/buildings14041018