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Constitutive model for rotation behaviour of semi-rigid steel beam-to-column joints
Abstract This study proposed a generalised and concise model consisting of spring-slider elements to characterise the nonlinear bending moment-rotation relationship of semi-rigid steel beam-to-column joints. First, the density function of the constitutive model was constructed based on the rotational characteristics of the joints. Second, the mathematical expression for the moment-rotation relationship of the constitutive model was derived. A method was developed to identify the parameters. Finally, after a discretisation method of the model was derived based on the strategy of evenly divided stiffness, the discrete model was applied to the numerical simulation of the rotation of the semi-rigid steel beam-to-column joints. It is observed that the proposed model accurately describes the rotation behaviour of semi-rigid connections in the entire rotation domain while reducing the degrees of freedom of the contact interfaces to improve the computing efficiency. There are six parameters in the model with a clear physical definition, which can be directly identified through macroscopic experiments. A high level of accuracy can be achieved by numerically calculating a discrete model using only five Jenkins elements.
Highlights A constitutive model for in-plane rotation behaviour of a semi-rigid joint is proposed. Parameter identification procedures of the model are provided. The discretization strategy based on the stiffness equation of the proposed model is derived. The model is embedded in the finite element software for numerical simulation of semi-rigid joints.
Constitutive model for rotation behaviour of semi-rigid steel beam-to-column joints
Abstract This study proposed a generalised and concise model consisting of spring-slider elements to characterise the nonlinear bending moment-rotation relationship of semi-rigid steel beam-to-column joints. First, the density function of the constitutive model was constructed based on the rotational characteristics of the joints. Second, the mathematical expression for the moment-rotation relationship of the constitutive model was derived. A method was developed to identify the parameters. Finally, after a discretisation method of the model was derived based on the strategy of evenly divided stiffness, the discrete model was applied to the numerical simulation of the rotation of the semi-rigid steel beam-to-column joints. It is observed that the proposed model accurately describes the rotation behaviour of semi-rigid connections in the entire rotation domain while reducing the degrees of freedom of the contact interfaces to improve the computing efficiency. There are six parameters in the model with a clear physical definition, which can be directly identified through macroscopic experiments. A high level of accuracy can be achieved by numerically calculating a discrete model using only five Jenkins elements.
Highlights A constitutive model for in-plane rotation behaviour of a semi-rigid joint is proposed. Parameter identification procedures of the model are provided. The discretization strategy based on the stiffness equation of the proposed model is derived. The model is embedded in the finite element software for numerical simulation of semi-rigid joints.
Constitutive model for rotation behaviour of semi-rigid steel beam-to-column joints
Liu, Xiao (author) / Hao, Zhiming (author)
2022-09-13
Article (Journal)
Electronic Resource
English
Design moment-rotation characteristics for steel semi-rigid beam-column joints
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