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Steel and Composite Structures Volume 2, Number 1, February 2002 , pages 21-34 DOI: https://doi.org/10.12989/scs.2002.2.1.021 |
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Modelling of local buckling in tubular steel frames by using plstic hinges with damage |
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Pether Inglessis, Samuel Medina, Alxis Lopez, Rafael Febres and Julio Florez-Lopez(Venezuela)
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| Abstract | ||
| A model of the process of local buckling in tubular steel structural elements is presented. It isrnassumed that this degrading phenomenon can be lumped at plastic hinges. The model is therefore based on thernconcept of plastic hinge combined with the methods of continuum damage mechanics. The state of this newrnkind of inelastic hinge is characterized by two internal variables: the plastic rotation and the damage. Thernmodel is valid if only one local buckling appears in the plastic hinge region; for instance, in the case of framedrnstructures subjected to monotonic loadings. Based on this damage model, a new finite element that canrndescribe the development of local buckling is proposed. The element is the assemblage of an elastic beam-columnrnand two inelastic hinges at its ends. The stiffness matrix, that depends on the level of damage, thernyielding function and the damage evolution law of the two hinges define the new finite element. In order tornverify model and finite element, several small-scale frames were tested in laboratory under monotonicrnloading. A lateral load at the top of the frame was applied in a stroke-controlled mode until local bucklingrnappears and develops in several locations of the frame and its ultimate capacity was reached. These tests werernsimulated with the new finite element and comparison between model and test is presented and discussed. | ||
| Key Words | ||
| local buckling; damage mechanics; structural failure; structural steel; inelastic behavior. | ||
| Address | ||
| Pether Inglessis, Samuel Medina | ||