Layered gradient honeycomb filling pier anti-collision device with negative poisson ratio

Abstract

The invention discloses a layered gradient honeycomb filling pier anti-collision device with a negative poisson ratio. The device comprises an outer-layer head-on collision panel, a layered gradient honeycomb filling sandwich layer and a steel plate inner anti-collision layer; the sandwich layer is composed of concave regular hexagon negative poisson ratio honeycomb framework and foam concrete materials filled in the honeycomb framework. All the components are formed by bonding epoxy resin glue, and the anti-collision sandwich structures are connected into a whole through I-shaped toggle clips. The device can achieve the effect of layered gradient through various forms such as cell wall thickness gradient, filler density gradient and cell element height gradient. Compared with a traditional anti-collision device, the device can absorb vehicle collision energy through plastic deformation and brittle deformation of materials, the energy absorption process can be controlled by changing the gradient form and the gradient coefficient, the vehicle collision force peak value is reduced, and the safety of piers and vehicles can be protected at the same time. The device is small in occupiedarea, convenient and fast to replace and small in adverse effect on traffic during replacement.

Description

technical field [0001] The invention relates to the technical field of bridge pier impact protection, in particular to a bridge pier anti-collision sandwich structure with a layered gradient negative Poisson's ratio honeycomb filling material as the core layer. The layered gradient negative Poisson's ratio honeycomb filling sandwich layer is composed of concave positive hexagonal negative Poisson's ratio honeycombs, foam concrete fillers and epoxy resin glue between the honeycombs. Background technique [0002] With the rapid development of urbanization, the population of urban areas has increased sharply. In order to alleviate the traffic pressure in urban areas and provide citizens with a more comfortable traffic environment, the number of viaducts and overpasses in cities is also increasing rapidly. While relieving traffic pressure, these urban infrastructures have also brought some safety hazards. In recent years, the accidents of vehicles colliding with bridge piers ha...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to propose a layered gradient negative Poisson's ratio for the above-mentioned problems such as the serious vehicle damage caused by the excessive rigidity of the anti-collision structure and the difficulty in controlling the energy absorption of the anti-collision device. Honeycomb filled sandwich structure anti-collision device

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