CN112575677A - Pier anti-collision facility with negative Poisson ratio effect and design method thereof - Google Patents
Pier anti-collision facility with negative Poisson ratio effect and design method thereof Download PDFInfo
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- CN112575677A CN112575677A CN202011589592.7A CN202011589592A CN112575677A CN 112575677 A CN112575677 A CN 112575677A CN 202011589592 A CN202011589592 A CN 202011589592A CN 112575677 A CN112575677 A CN 112575677A
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- collision
- negative poisson
- poisson ratio
- pier
- facility
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- 230000000694 effects Effects 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 17
- 239000003733 fiber-reinforced composite Substances 0.000 claims abstract description 8
- 239000006260 foam Substances 0.000 claims abstract description 8
- 239000003365 glass fiber Substances 0.000 claims description 10
- 239000011208 reinforced composite material Substances 0.000 claims description 10
- 229920005830 Polyurethane Foam Polymers 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 230000003139 buffering effect Effects 0.000 claims description 3
- 238000009787 hand lay-up Methods 0.000 claims description 3
- 230000000737 periodic effect Effects 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 abstract description 7
- 230000006835 compression Effects 0.000 abstract description 3
- 238000007906 compression Methods 0.000 abstract description 3
- 238000005260 corrosion Methods 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F15/00—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact
- E01F15/14—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact specially adapted for local protection, e.g. for bridge piers, for traffic islands
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01F—ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTION OF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, OR THE LIKE
- E01F15/00—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact
- E01F15/14—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact specially adapted for local protection, e.g. for bridge piers, for traffic islands
- E01F15/141—Safety arrangements for slowing, redirecting or stopping errant vehicles, e.g. guard posts or bollards; Arrangements for reducing damage to roadside structures due to vehicular impact specially adapted for local protection, e.g. for bridge piers, for traffic islands for column or post protection
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/20—Equipment for shipping on coasts, in harbours or on other fixed marine structures, e.g. bollards
- E02B3/26—Fenders
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/30—Adapting or protecting infrastructure or their operation in transportation, e.g. on roads, waterways or railways
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- Engineering & Computer Science (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Architecture (AREA)
- Ocean & Marine Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a pier anti-collision facility with a negative Poisson ratio effect and a design method thereof. 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. Due to the buffer effect of the foam filling core on the shrinkage deformation of the negative Poisson ratio frame, the anti-collision facility has a longer stress platform section, and compared with the traditional anti-collision facility made of positive Poisson ratio materials, the anti-collision energy-consumption performance of the anti-collision facility 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
Technical Field
The invention relates to a pier anti-collision facility with a negative Poisson ratio effect, which is designed by designing a negative Poisson ratio anti-chiral concave mixed structure.
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 invention creatively combines the anti-hand structure with the concave hexagon structure, and designs a novel anti-hand concave mixed structure for the first time. The structure is found to have strong energy absorption capacity through finite element simulation.
The invention combines a negative Poisson ratio structure with a composite material, and designs a first negative Poisson ratio self-floating pier anti-collision facility taking a fiber reinforced composite material as a base material by utilizing the outstanding energy absorption capacity of the negative Poisson ratio structure and the high-strength light-weight performance of the fiber reinforced composite material.
Disclosure of Invention
The invention aims to optimize the structure of the existing pier anti-collision facility so as to improve the protection of the pier anti-collision facility and expand the pier anti-collision facility into any similar anti-collision energy-absorbing facility, and provides the pier anti-collision facility with the negative Poisson ratio effect and a design method thereof.
The technical scheme adopted by the invention is as follows: 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 key to the negative poisson's ratio effect of the present invention is the design of the internal 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 form of the invention can also be a negative Poisson ratio cell structure such as a chiral structure, an inwards concave hexagonal structure and the like.
Has the advantages that: the pier anti-collision facility designed by the method has a larger negative Poisson ratio effect when being pressed. The partition plates and the foams in the traditional pier anti-collision facilities cannot generate a good synergistic effect, and the invention efficiently combines the glass fiber reinforced composite material, the negative Poisson ratio effect, the interaction of the internal frame and the foams and the like together, thereby greatly reducing the energy generated by collision. 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. Due to the buffer effect of the foam filling core on the shrinkage deformation of the negative Poisson ratio frame, the anti-collision facility has a longer stress platform section, and compared with the traditional anti-collision facility made of positive Poisson ratio materials, the anti-collision energy-consumption performance of the anti-collision facility 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 specific embodiments and the accompanying drawings in which:
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 construed as the protection scope of the present invention. Components not explicitly described in this example can be implemented using existing techniques.
Claims (2)
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.
2. The design method of an anti-collision facility for piers having a negative poisson's ratio effect as claimed in claim 1, wherein: the method 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011589592.7A CN112575677A (en) | 2020-12-29 | 2020-12-29 | Pier anti-collision facility with negative Poisson ratio effect and design method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011589592.7A CN112575677A (en) | 2020-12-29 | 2020-12-29 | Pier anti-collision facility with negative Poisson ratio effect and design method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN112575677A true CN112575677A (en) | 2021-03-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011589592.7A Pending CN112575677A (en) | 2020-12-29 | 2020-12-29 | Pier anti-collision facility with negative Poisson ratio effect and design method thereof |
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| CN (1) | CN112575677A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115323960A (en) * | 2022-07-11 | 2022-11-11 | 泉州装备制造研究所 | Urban traffic protective guard |
| CN115323960B (en) * | 2022-07-11 | 2024-05-31 | 泉州装备制造研究所 | Urban traffic rail guard |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204185800U (en) * | 2014-09-28 | 2015-03-04 | 常州慧运复合材料有限公司 | Composite material bridge protector |
| CN104763772A (en) * | 2015-03-31 | 2015-07-08 | 华南理工大学 | Buffering and energy absorbing structure |
| CN110744873A (en) * | 2019-11-22 | 2020-02-04 | 南京工业大学 | 3D printing structure composite material sandwich board with negative Poisson ratio effect and processing method |
| CN110984417A (en) * | 2019-12-18 | 2020-04-10 | 青岛理工大学 | Anti-collision device combining chiral negative Poisson ratio structure and honeycomb structure |
| CN214271672U (en) * | 2020-12-29 | 2021-09-24 | 南京工业大学 | Pier anti-collision facility with negative Poisson ratio effect |
-
2020
- 2020-12-29 CN CN202011589592.7A patent/CN112575677A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204185800U (en) * | 2014-09-28 | 2015-03-04 | 常州慧运复合材料有限公司 | Composite material bridge protector |
| CN104763772A (en) * | 2015-03-31 | 2015-07-08 | 华南理工大学 | Buffering and energy absorbing structure |
| CN110744873A (en) * | 2019-11-22 | 2020-02-04 | 南京工业大学 | 3D printing structure composite material sandwich board with negative Poisson ratio effect and processing method |
| CN110984417A (en) * | 2019-12-18 | 2020-04-10 | 青岛理工大学 | Anti-collision device combining chiral negative Poisson ratio structure and honeycomb structure |
| CN214271672U (en) * | 2020-12-29 | 2021-09-24 | 南京工业大学 | Pier anti-collision facility with negative Poisson ratio effect |
Non-Patent Citations (1)
| Title |
|---|
| 于靖军等: "负泊松比超材料研究进展", 机械工程学报, vol. 54, no. 13, 5 July 2018 (2018-07-05), pages 1 - 14 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115323960A (en) * | 2022-07-11 | 2022-11-11 | 泉州装备制造研究所 | Urban traffic protective guard |
| CN115323960B (en) * | 2022-07-11 | 2024-05-31 | 泉州装备制造研究所 | Urban traffic rail guard |
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