CN214271672U - Pier anti-collision facility with negative Poisson ratio effect - Google Patents

Abstract

The utility model discloses a pier anticollision facility with negative poisson ratio effect, fill the core including negative poisson ratio anti-chirality indent structural framework, combined material shell, foam. Due to the deformation characteristic of the tension, expansion and compression of the negative Poisson ratio hole structure, the facility has good energy absorption characteristic. The negative Poisson ratio anti-hand concave structure creatively introduces an inner concave angle on the basis of an anti-hand structure, so that the negative Poisson ratio effect is more obvious when the negative Poisson ratio concave structure bears load. When the ship is impacted, the negative poisson ratio structural frame transversely contracts under pressure. Because the foam fills the cushioning effect of core to negative poisson ratio frame shrinkage deformation, make anticollision institution have longer stress platform section, compare positive poisson ratio material tradition anticollision institution, the utility model discloses an energy consumption performance that shocks resistance is better. In addition, due to the characteristics of light weight and corrosion resistance of the fiber reinforced composite material, the anti-collision facility can float on the water surface.

Description

Pier anti-collision facility with negative Poisson ratio effect

Technical Field

The utility model relates to a have negative poisson ratio anti-chiral indent mixed structure through the design and design pier anticollision facility that has negative poisson ratio effect, use glass fiber reinforced composite as the basis material of crashproof shell and inside negative poisson ratio anti-chiral indent structural framework, belong to new material new construction and combined material's cross field.

Background

The ship-bridge collision accident often causes bridge piers to be damaged, ships to be damaged, casualties, traffic jam on water roads and the like, and causes a great amount of economic loss, and the problem is widely concerned by scholars at home and abroad. The fiber reinforced composite material with the characteristics of soft material, light weight, high strength, corrosion resistance and the like is used for manufacturing self-floating pier anti-collision facilities and is widely applied to bridge design at present.

The negative poisson's ratio structure has special mechanical properties, and transverse contraction (expansion) occurs when uniaxial compression (stretching) occurs. The sound absorption board has excellent performances in the aspects of shear resistance, indentation resistance, sound absorption, energy absorption and the like. The utility model discloses the novelty will turn over the hand structure and combine together with indent hexagonal structure, designs out a neotype turning over hand indent mixed structure for the first time. The structure is found to have strong energy absorption capacity through finite element simulation.

The utility model discloses combine together negative poisson ratio structure and combined material, utilize the outstanding energy absorption ability of negative poisson ratio structure and fibre reinforced composite's high-strength light performance, design the first negative poisson ratio self-floating pier anticollision facilities who uses fibre reinforced composite as the substrate.

SUMMERY OF THE UTILITY MODEL

The utility model aims at carrying out configuration optimization to current pier anticollision facility to improve its protection to the pier, do and extend into arbitrary similar crashproof energy-absorbing facility, and provided a pier anticollision facility with negative poisson's ratio effect.

The utility model adopts the technical proposal that: a pier collision avoidance facility with a negative Poisson ratio effect is an annular device arranged around a pier and comprises a collision avoidance shell, an inner frame and a filling core;

the base materials of the anti-collision shell and the inner frame are glass fiber reinforced composite materials, and the filling core is PU foam;

the internal frame is an anti-hand concave structure frame, and the periodic arrangement of negative Poisson's ratio anti-hand concave units is adopted;

the length L and the width W of the anti-collision shell are matched with the size of a protected pier;

the rib concave angle of the anti-chiral concave structure frame meets the following requirements: theta is more than or equal to 90 degrees and less than or equal to 180 degrees; the relation between the cell element center distance D of the anti-chiral concave structure frame and the shell length L is as follows: L/D is more than or equal to 15 and less than or equal to 30; the relation between the cell element center distance D and the thickness t of the anti-chiral concave structure frame is as follows: d/t is more than or equal to 5 and less than or equal to 10.

The design method of the pier anti-collision facility with the negative Poisson ratio effect comprises the following steps:

1) designing the sizes of the anti-collision shell, the anti-chiral concave structure frame and the filling core according to the actual size of the pier, wherein the anti-chiral concave structure frame is required to meet the limitation of the theta angle;

2) selecting glass fiber reinforced composite materials as base materials of the anti-collision shell and the internal frame, wherein the glass fiber reinforced composite materials are formed in one step by a hand lay-up method;

3) and filling pre-cut PU foam into the anti-collision outer shell and the inner frame to manufacture the self-floating pier anti-collision facility with the negative Poisson ratio effect.

4) The anti-collision facility of the bridge pier is wrapped around the bridge pier, when the bridge pier bears ship impact, the anti-collision shell made of the fiber reinforced composite materials firstly bears load and then transmits the load to the internal structure, and due to the negative Poisson ratio effect of the anti-chiral concave structure, the internal frame is compressed and contracted and is mutually extruded with the foam core, so that the buffering effect is achieved, and the impact force is greatly weakened.

The utility model discloses its key that produces negative poisson's ratio effect lies in the design of inner frame. The frame is ensured to have ribs with a certain angle, so that the inner frame has a negative Poisson ratio effect, and the whole anti-collision facility has the negative Poisson ratio effect. The pier anti-collision facility designed by the method has obvious negative Poisson ratio effect, and can prevent the inner frame from being bent early due to the existence of the foam filling core. In addition, the designed negative Poisson ratio anti-collision structure not only can be applied to a pier, but also can be applied to other anti-collision energy-absorbing structures, and has certain universality. The internal frame unit of the utility model can also be a negative Poisson ratio cell structure such as a chiral structure and an inwards concave hexagonal structure.

Has the advantages that: utilize the utility model discloses pier anticollision facility that the method designed has great negative poisson ratio effect when pressurized. The inside baffle of traditional pier anticollision facility and foam can not produce fine synergistic effect, the utility model discloses with several aspects efficient cooperations such as the interact of glass fiber reinforced composite, negative poisson's ratio effect, inner frame and foam together to great energy that has cut down the collision and produce. Due to the deformation characteristic of the tension, expansion and compression of the negative Poisson ratio hole structure, the facility has good energy absorption characteristic. The negative Poisson ratio anti-hand concave structure creatively introduces an inner concave angle on the basis of an anti-hand structure, so that the negative Poisson ratio effect is more obvious when the negative Poisson ratio concave structure bears load. When the ship is impacted, the negative poisson ratio structural frame transversely contracts under pressure. Because the foam fills the cushioning effect of core to negative poisson ratio frame shrinkage deformation, make anticollision institution have longer stress platform section, compare positive poisson ratio material tradition anticollision institution, the utility model discloses an energy consumption performance that shocks resistance is better. In addition, due to the characteristics of light weight and corrosion resistance of the fiber reinforced composite material, the anti-collision facility can float on the water surface.

Drawings

FIG. 1 is an overall structure view of a collision avoidance pier installation having a negative Poisson's ratio effect;

FIG. 2 is a top view of a pier collision avoidance facility having a negative Poisson's ratio effect;

FIG. 3 is an anti-hand concave frame of a pier collision avoidance facility with a negative Poisson's ratio effect;

FIG. 4 is another outer shell of an anti-collision facility for piers having a negative Poisson's ratio effect;

fig. 5 and 6 are schematic views of the anti-chiral structure.

Detailed Description

The invention will be further described with reference to the following specific embodiments and the accompanying drawings:

as shown in fig. 1 to 6, a pier collision avoidance facility having a negative poisson's ratio effect, which is an annular device disposed around a pier, includes a collision prevention shell 2, an inner frame 1, and a filling core 1;

the base materials of the anti-collision shell 2 and the inner frame 1 are glass fiber reinforced composite materials, and the filling core 1 is PU foam;

the internal frame 1 is an anti-hand concave structure frame and adopts the periodic arrangement of negative Poisson ratio anti-hand concave units;

the length L and the width W of the anti-collision shell 2 are matched with the size of a protected pier;

the rib concave angle of the anti-chiral concave structure frame meets the following requirements: theta is more than or equal to 90 degrees and less than or equal to 180 degrees; the relation between the cell element center distance D of the anti-chiral concave structure frame and the shell length L is as follows: L/D is more than or equal to 15 and less than or equal to 30; the relation between the cell element center distance D and the thickness t of the anti-chiral concave structure frame is as follows: d/t is more than or equal to 5 and less than or equal to 10.

The design method of the pier anti-collision facility with the negative Poisson ratio effect comprises the following steps:

1) designing the sizes of the anti-collision shell, the anti-chiral concave structure frame and the filling core according to the actual size of the pier, wherein the anti-chiral concave structure frame is required to meet the limitation of the theta angle;

2) selecting glass fiber reinforced composite materials as base materials of the anti-collision shell and the internal frame, wherein the glass fiber reinforced composite materials are formed in one step by a hand lay-up method;

3) and filling pre-cut PU foam into the anti-collision outer shell and the inner frame to manufacture the self-floating pier anti-collision facility with the negative Poisson ratio effect.

4) The anti-collision facility of the bridge pier is wrapped around the bridge pier, when the bridge pier bears ship impact, the anti-collision shell made of the fiber reinforced composite materials firstly bears load and then transmits the load to the internal structure, and due to the negative Poisson ratio effect of the anti-chiral concave structure, the internal frame is compressed and contracted and is mutually extruded with the foam core, so that the buffering effect is achieved, and the impact force is greatly weakened. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be considered as the protection scope of the present invention. Components not explicitly described in this example can be implemented using existing techniques.

Claims (1)

1. A pier anti-collision facility with a negative Poisson ratio effect is characterized in that: the bridge pier anti-collision facility is an annular device arranged around a bridge pier and comprises an anti-collision shell, an internal frame and a filling core;

the base materials of the anti-collision shell and the inner frame are glass fiber reinforced composite materials, and the filling core is PU foam;

the internal frame is an anti-hand concave structure frame, and the periodic arrangement of negative Poisson's ratio anti-hand concave units is adopted;

the length L and the width W of the anti-collision shell are matched with the size of a protected pier;

the rib concave angle of the anti-chiral concave structure frame meets the following requirements: theta is more than or equal to 90 degrees and less than or equal to 180 degrees; the relation between the cell element center distance D of the anti-chiral concave structure frame and the shell length L is as follows: L/D is more than or equal to 15 and less than or equal to 30; the relation between the cell element center distance D and the thickness t of the anti-chiral concave structure frame is as follows: d/t is more than or equal to 5 and less than or equal to 10.

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