CN112761255A - Novel fractal buckling-restrained brace and design method thereof - Google Patents
Novel fractal buckling-restrained brace and design method thereof Download PDFInfo
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- CN112761255A CN112761255A CN202110034001.8A CN202110034001A CN112761255A CN 112761255 A CN112761255 A CN 112761255A CN 202110034001 A CN202110034001 A CN 202110034001A CN 112761255 A CN112761255 A CN 112761255A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/30—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts being composed of two or more materials; Composite steel and concrete constructions
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
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Abstract
The invention relates to the field of building structure reinforcement, in particular to a novel fractal buckling restrained brace and a design method thereof, wherein the novel fractal buckling restrained brace comprises the following components in parts by weight: the fractal core unit is provided with a weakening part in the middle, the cross section of the weakening part comprises a plurality of fractal points which are sequentially connected, and the fractal points are obtained through a fractal dimension, wherein the fractal dimension is 1.2; the constraint units are arranged on the outer sides of the weakened parts, and the other constraint units are arranged on two sides of the fractal core unit; and the filling unit is arranged between the weakening part and the corresponding constraint unit, and supports the fractal core unit. The beneficial effects are that: the fractal buckling-restrained brace fuses the traditional buckling-restrained brace with the fractal dimension theory, simplifies the complex stiffening design of the joint, and gives way in advance to other components when the fractal buckling-restrained brace is subjected to an axial external force, thereby playing a role of a fuse.
Description
Technical Field
The invention relates to the field of building structure reinforcement, in particular to a novel fractal buckling-restrained brace and a design method thereof.
Background
Fractal dimension is known as the Fractal (fractional) theory of the geometry of nature, is a new branch of modern mathematics, but is a new world view and methodology in essence. The fractal dimension reflects the effectiveness of the space occupied by the complex shape and is a measure of the irregularity of the complex shape. It is cross-combined with chaos theory of power system to supplement each other. It recognizes that parts of the world may exhibit global similarity in some aspect (morphology, structure, information, function, time, energy, etc.) under certain conditions or processes, and that changes in spatial dimensions may be either discrete or continuous, thus extending the field of view.
The existing building structure reinforcing method generally adopts the traditional reinforced concrete buckling restrained brace, and the traditional reinforced concrete buckling restrained brace is proved to be applicable to structure reinforcement by practice because the research is relatively mature. But the reinforcing method not only has great weight and wastes manpower and financial resources, but also has slow construction speed. In addition, the replacement is not easy, and the like.
Disclosure of Invention
The invention aims to provide a novel fractal buckling-restrained brace and a design method thereof, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a novel fractal buckling restrained brace comprises: the fractal core unit is provided with a weakening part in the middle, the cross section of the weakening part comprises a plurality of fractal points which are sequentially connected, and the fractal points are obtained through a fractal dimension, wherein the fractal dimension is 1.2; the constraint units are arranged on the outer sides of the weakened parts, and the other constraint units are arranged on two sides of the fractal core unit; the filling unit is arranged between the weakening part and the corresponding constraint unit and supports the fractal core unit; the connecting unit is connected with the fractal core unit, the constraint unit and the external structure.
As a further scheme of the invention: the constraint unit comprises constraint cushion blocks and constraint steel plates, wherein the constraint cushion blocks are oppositely arranged on the outer sides of the weakening parts, and the constraint steel plates are oppositely arranged on two sides of the fractal core unit.
As a still further scheme of the invention: and a transition part is arranged between the fractal core unit and the connecting unit and is used for transmitting the force borne by the connecting unit to the fractal core unit.
As a still further scheme of the invention: the filling material of the filling unit is a rubber material.
As a still further scheme of the invention: the connecting unit comprises a plurality of connecting parts which are connected with the fractal core unit in a cross manner.
As a still further scheme of the invention: and an elastic element is arranged between the constraint unit corresponding to the weakened part and the connecting unit and used for limiting and supporting the constraint unit corresponding to the weakened part.
As another technical scheme provided by the invention: a novel design method of a fractal buckling restrained brace comprises the following steps: designing a fractal core unit, selecting a fractal dimension of the fractal buckling-restrained brace, and extracting a fractal point by using MATLAB software according to the fractal dimension; drawing a fractal core unit one-dimensional graph by using drawing software according to the fractal points; drawing a prototype of the fractal core unit by using simulation software according to the one-dimensional graph of the fractal core unit, and generating a three-dimensional graph of the fractal core unit; and designing a constraint unit and a connection unit, and simulating the three-dimensional graph of the constraint unit and the three-dimensional graph of the connection unit by the three-dimensional graph of the fractal core unit.
As a still further scheme of the invention: the fractal dimension was chosen to be 1.2.
As a still further scheme of the invention: the drawing software adopts AutoCAD 2014.
As a still further scheme of the invention: the simulation software used ABAQUS 2017.
Compared with the prior art, the invention has the beneficial effects that: neotype fractal buckling restrained brace fuses traditional buckling restrained brace and fractal dimension theory mutually, has simplified the complicated design of putting more energy into of junction on the one hand, and on the other hand when it receives axial external force, yields in advance in other components in advance, has played "fuse" effect, and as first defence line, advance to go into the plastics and consume energy the stage and produce and yield before the major structure damages, has protected the main part.
Drawings
Fig. 1 is a schematic structural diagram of the novel fractal buckling restrained brace in the embodiment of the invention.
Fig. 2 is a schematic side view of the novel fractal buckling restrained brace in the embodiment of the invention.
Fig. 3 is a schematic front view of the novel fractal buckling restrained brace in the embodiment of the invention.
Fig. 4 is a schematic top view of a novel fractal buckling restrained brace in an embodiment of the present invention.
FIG. 5 is a schematic view of the assembly of the upper outer restraint cushion and the lower outer restraint cushion in an embodiment of the present invention.
FIG. 6 is a schematic structural diagram of left and right outer restraining steel plates in an embodiment of the present invention.
Fig. 7 is a schematic structural view of a three-layered steel frame according to another embodiment of the present invention.
In the drawings: 1. m6 bolt holes; 2. an upper external restraint cushion block; 3. a fractal core unit; 4. filling rubber; 5. a limiting unit; 6. a stiffener steel plate; 7. a transition section steel plate; 8. a right outer constraint steel plate; 9. a lower outer restraint cushion block; 10. a left outer constraint steel plate; 11. connecting section steel plates; 12. m10 bolt holes; 100. a fractal buckling restrained brace; 200. an independent foundation; 201. a frame column; 202. a frame beam; 203. a bolt; 204. high-rigidity back steel.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
Referring to fig. 1-4, in an embodiment of the present invention, a novel fractal buckling restrained brace includes: the fractal core unit 3 is characterized in that the middle part of the fractal core unit 3 is a weakening part, the cross section of the weakening part comprises a plurality of fractal points which are sequentially connected, and the fractal points are obtained through a fractal dimension, wherein the fractal dimension is 1.2; one group of the restraining units are relatively arranged at the outer side of the weakened part, and the other group of the restraining units are relatively arranged at two sides of the fractal core unit 3; the filling unit is arranged between the weakening part and the corresponding constraint unit and supports the fractal core unit; the connecting unit is connected with the fractal core unit 3, the constraint unit and the external structure.
Specifically, the constraint unit comprises a constraint cushion block and constraint steel plates, wherein the constraint cushion block is oppositely arranged on the outer side of the weakened part, and the constraint steel plates are oppositely arranged on two sides of the fractal core unit. The filling material of the filling unit is rubber material, and the rubber material is filled between the weakening part and the corresponding constraint unit to form rubber filling 4, so that the transmission of force between the fractal core unit and the constraint unit can be ensured, and the deformation of the fractal core unit can be relieved. Further, as shown in fig. 5 and 6, the outer edge of the middle part of the fractal core unit 3 is an irregular zigzag structure, the zigzag structure has weakened portions, the constraining cushion blocks are respectively an upper outer constraining cushion block 2 and a lower outer constraining cushion block 9, and form a group of constraining units respectively outside the weakened portions; the restraining steel plates are respectively a right outer restraining steel plate 8 and a left outer restraining steel plate 10 which are respectively arranged on the left side and the right side of the fractal core unit; the upper outer constraint cushion block 2, the lower outer constraint cushion block 9, the right outer constraint steel plate 8 and the left outer constraint steel plate 10 are all used for preventing the fractal core unit 3 from buckling. Compared with the traditional reinforced concrete buckling restrained brace, the novel fractal buckling restrained brace is convenient to install and replace, saves manpower and material resources, and reduces the cost; and the whole structure has light weight, high strength and good energy consumption.
In conclusion, the novel fractal buckling restrained brace fuses traditional buckling restrained brace and fractal dimension theory, has simplified the complicated design of putting more energy into of junction on the one hand, and on the other hand receives axial external force when it, yields in advance in other components in advance, has played the effect of "fuse", is as first defence line before the major structure damages, advances to produce and yields in the plasticity power consumption stage, has protected the main part.
Referring to fig. 1 to 6, in a preferred embodiment of the present invention, a transition portion is disposed between the fractal core unit and the connection unit, and is used for transmitting a force applied to the connection unit to the fractal core unit. The connecting unit comprises a plurality of connecting parts which are connected with the fractal core unit in a cross manner.
Specifically, the fractal core unit, the constraint unit and the connection unit are made of alloy steel. Firstly, manufacturing a fractal core unit without a transition part and a connecting unit by using a steel plate, wherein the length, the width and the height of the fractal core unit are respectively 300mm, 50mm and 10 mm; secondly, manufacturing a serrated upper outer constraint cushion block 2 and a serrated lower outer constraint cushion block 9 which are 12mm in thickness and are in contact with the edge of the fractal core unit by using a steel plate, and respectively processing and connecting M6 bolt holes 1 for fixing on the upper outer constraint cushion block 2 and the lower outer constraint cushion block 9; and then manufacturing a right external constraint steel plate 8 and a left external constraint steel plate 10 which are 300mm, 100mm and 20mm in length, width and height respectively and are in contact with the residual surface of the fractal core unit, and processing and connecting M6 bolt holes 1 for fixing. The upper and lower external constraint cushion blocks are connected with the left and right external constraint rectangular steel plates by bolts to realize the constraint of the fractal core unit 3 so as to prevent the buckling of the fractal core unit; finally, welding and stiffening the connecting unit, namely, the connecting part adopts a connecting section steel plate 11, and welding and stiffening rib steel plates 6 are welded on the connecting section steel plate 11; and an M10 bolt hole 12 is processed on the connecting section steel plate 11, and the fractal core unit is connected with an external structure through the M10 bolt hole 12.
Furthermore, an elastic element is arranged between the constraint unit corresponding to the weakened part and the connecting unit and used for limiting and supporting the constraint unit corresponding to the weakened part.
The elastic element selects a spring as a limiting unit 5 for limiting and supporting the connecting unit and the constraint unit corresponding to the weakened part.
Referring to fig. 1 and 7, in another embodiment of the present invention, a plurality of fractal buckling restrained braces 100 are installed between the back steel and the frame structure at intervals for preventing the frame structure from deforming.
Specifically, the back steel is high-rigidity back steel 204, the frame structure comprises an independent foundation of a construction plane, a frame column 201 installed on the independent foundation and a frame beam 202 connected with the frame column 201, and the frame column 201, the frame beam 202 and the fractal buckling-restrained brace 100 are fixedly connected through bolts 203; the fractal buckling-restrained brace 100 is arranged between the high-rigidity back steel 204 and the frame structure, so that when the fractal buckling-restrained brace 100 is subjected to an external force, the frame structure yields in advance, a fuse effect is achieved, the fractal buckling-restrained brace serves as a first line of defense before the frame structure is damaged, and the fractal buckling-restrained brace firstly enters a plastic energy consumption stage to yield and protect the frame structure.
Referring to fig. 1 to 6, in another embodiment of the present invention, a method for designing a novel fractal buckling restrained brace includes the following steps: designing a fractal core unit, selecting a fractal dimension of the fractal buckling-restrained brace, and extracting a fractal point by using MATLAB software according to the fractal dimension; drawing a fractal core unit one-dimensional graph by using drawing software according to the fractal points; drawing a prototype of the fractal core unit by using simulation software according to the one-dimensional graph of the fractal core unit, and generating a three-dimensional graph of the fractal core unit; and designing a constraint unit and a connection unit, and simulating the three-dimensional graph of the constraint unit and the three-dimensional graph of the connection unit by the three-dimensional graph of the fractal core unit.
Specifically, the fractal dimension is selected to be 1.2. The drawing software adopts AutoCAD 2014. The simulation software used ABAQUS 2017.
As described above, the three-dimensional figures of the fractal core unit, the constraint unit and the connection unit are derived or directly generated into a processing instruction, and the processing is performed on the processing center and the lathe. Firstly, manufacturing a fractal core unit without a transition part and a connecting unit by using a steel plate, wherein the length, the width and the height of the fractal core unit are respectively 300mm, 50mm and 10 mm; secondly, manufacturing a serrated upper outer constraint cushion block 2 and a serrated lower outer constraint cushion block 9 which are 12mm in thickness and are in contact with the edge of the fractal core unit by using a steel plate, and respectively processing and connecting M6 bolt holes 1 for fixing on the upper outer constraint cushion block 2 and the lower outer constraint cushion block 9; and then manufacturing a right external constraint steel plate 8 and a left external constraint steel plate 10 which are 300mm, 100mm and 20mm in length, width and height respectively and are in contact with the residual surface of the fractal core unit, and processing and connecting M6 bolt holes 1 for fixing. The upper and lower external constraint cushion blocks are connected with the left and right external constraint rectangular steel plates by bolts to realize the constraint of the fractal core unit 3 so as to prevent the buckling of the fractal core unit; finally, welding and stiffening the connecting unit, namely, the connecting part adopts a connecting section steel plate 11, and welding and stiffening rib steel plates 6 are welded on the connecting section steel plate 11; and an M10 bolt hole 12 is processed on the connecting section steel plate 11, and the fractal core unit is connected with an external structure through the M10 bolt hole 12.
It should be noted that the formula for calculating the fractal dimension is as follows:
where ε is the length of a side of the minicubes, N (ε) is the number of instances in which the minicubes were used to cover the feature being measured, and the dimension formula means that the dimension of the feature is determined by covering the feature with a minicube having a side length of ε. For a regular object in general, the number of segments per unit length is N (e) 1/e, a square per unit side length, N (e) 1/e2Cube covering unit side length, N (epsilon) ═ 1/epsilon)3. From these three equations it can be seen that the dimensional formulation also applies to the usual dimensional meaning. Therefore, under the condition that the selected fractal dimension d is 1.2, a fractal point can be extracted through MATLAB software; and drawing a graph by the extracted fractal points.
The working principle of the invention is as follows: the traditional buckling restrained brace is fused with a fractal dimension theory, fractal points are extracted according to the fractal dimension, then the extracted fractal points are combined with the traditional buckling restrained brace to draw a graph, and a three-dimensional graph is obtained through the drawing graph simulation, so that the novel fractal buckling restrained brace is manufactured.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (10)
1. A novel fractal buckling restrained brace is characterized by comprising:
the fractal core unit is provided with a weakening part in the middle, the cross section of the weakening part comprises a plurality of fractal points which are sequentially connected, and the fractal points are obtained through a fractal dimension, wherein the fractal dimension is 1.2;
the constraint units are arranged on the outer sides of the weakened parts, and the other constraint units are arranged on two sides of the fractal core unit; and
the filling unit is arranged between the weakening part and the corresponding constraint unit and supports the fractal core unit; the connecting unit is connected with the fractal core unit, the constraint unit and the external structure.
2. The novel fractal buckling restrained brace as claimed in claim 1, wherein the constraining unit comprises a constraining cushion block relatively installed at the outer side of the weakened portion, and constraining steel plates relatively installed at both sides of the fractal core unit.
3. The novel fractal buckling restrained brace as claimed in claim 1, wherein a transition portion is provided between the fractal core unit and the connection unit, for transmitting the force applied to the connection unit to the fractal core unit.
4. The novel fractal buckling restrained brace as claimed in claim 1, wherein the filling material of the filling unit is a rubber material.
5. The novel fractal buckling restrained brace as claimed in claim 1, wherein the connection unit comprises a plurality of connection portions connected with the fractal core unit in a cross-shape.
6. The novel fractal buckling restrained brace of claim 1, wherein an elastic element is installed between the constraint unit corresponding to the weakened portion and the connection unit, and is used for spacing and supporting the constraint unit corresponding to the weakened portion.
7. A novel design method of a fractal buckling restrained brace is characterized by comprising the following steps:
designing a fractal core unit, selecting a fractal dimension of the fractal buckling-restrained brace, and extracting a fractal point by using MATLAB software according to the fractal dimension;
drawing a fractal core unit one-dimensional graph by using drawing software according to the fractal points;
drawing a prototype of the fractal core unit by using simulation software according to the one-dimensional graph of the fractal core unit, and generating a three-dimensional graph of the fractal core unit;
and designing a constraint unit and a connection unit, and simulating the three-dimensional graph of the constraint unit and the three-dimensional graph of the connection unit by the three-dimensional graph of the fractal core unit.
8. The design method of the novel fractal buckling restrained brace as claimed in claim 7, wherein the fractal dimension is selected to be 1.2.
9. The novel design method of the fractal buckling restrained brace according to claim 7, wherein the drawing software adopts AutoCAD 2014.
10. The design method of the novel fractal buckling restrained brace as claimed in claim 7, wherein ABAQUS 2017 is adopted as the simulation software.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110034001.8A CN112761255A (en) | 2021-01-12 | 2021-01-12 | Novel fractal buckling-restrained brace and design method thereof |
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| CN202110034001.8A CN112761255A (en) | 2021-01-12 | 2021-01-12 | Novel fractal buckling-restrained brace and design method thereof |
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| CN202110034001.8A Pending CN112761255A (en) | 2021-01-12 | 2021-01-12 | Novel fractal buckling-restrained brace and design method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114182842A (en) * | 2021-12-28 | 2022-03-15 | 中交鹭建有限公司 | Buckling restrained brace adopting three-dimensional fractal function |
| CN114182843A (en) * | 2021-12-28 | 2022-03-15 | 中交鹭建有限公司 | Buckling restrained brace adopting W-M fractal function |
-
2021
- 2021-01-12 CN CN202110034001.8A patent/CN112761255A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114182842A (en) * | 2021-12-28 | 2022-03-15 | 中交鹭建有限公司 | Buckling restrained brace adopting three-dimensional fractal function |
| CN114182843A (en) * | 2021-12-28 | 2022-03-15 | 中交鹭建有限公司 | Buckling restrained brace adopting W-M fractal function |
| CN114182842B (en) * | 2021-12-28 | 2023-09-01 | 中交鹭建有限公司 | Buckling restrained brace adopting three-dimensional fractal function |
| CN114182843B (en) * | 2021-12-28 | 2024-02-23 | 中交鹭建有限公司 | Buckling restrained brace adopting W-M fractal function |
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