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A simplified model of a steel column subjected to impact

Abstract : The impact response of structures becomes of great interest for recent research activities due to the concern for public safety regarding the accidents (e.g. a vehicle collision onto the building structure). In the event of impact, the structure can be expected to undergo large plastic deformation which is required to absorb kinetic energy generated from the moving vehicle. In this paper, the nonlinear response of a steel column subjected to transversal vehicle collision is studied. The deformation of the column is assumed to occur at critical locations where the generalized plastic hinges are formed. A simplified model which consists of rigid bars connected by elasto-plastic hinges is presented. To include the effect of the surrounding structure, an elastic spring and a mass are attached to the top end of the column where a constant compressive load is also applied. The elliptical yield surfaces in a stress resultant space that account for the interaction between bending moment and axial force are used. Regarding the impact load, the unilateral contact is adopted while friction is ignored. Because of the reason that the velocities and the contact force cannot be defined at impact point of time, the differential measures are written to combine the smooth and non-smooth parts. The set-value force laws including Newton's impact law are adopted to describe the contact condition. Concerning with the time integration, the classical midpoint rule scheme is employed to integrate the equations of motion and the flow rule of the hinges. The paper also presents numerical applications of the model to show its ability to describe the nonlinear dynamic behavior of a steel column under transversal vehicle collision.
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Contributor : Laurent Jonchère <>
Submitted on : Wednesday, December 14, 2016 - 3:08:56 PM
Last modification on : Thursday, April 16, 2020 - 3:44:02 PM

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  • HAL Id : hal-01416482, version 1

Citation

P. Heng, Mohammed Hjiaj, J.-M. Battini. A simplified model of a steel column subjected to impact. 7th European Congress on Computational Methods in Applied Sciences and Engineering, ECCOMAS Congress 2016, Jun 2016, Hersonissos, Greece. pp.273--286. ⟨hal-01416482⟩

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