CN114790847B - Rotary friction-variable self-resetting node - Google Patents
Rotary friction-variable self-resetting node Download PDFInfo
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- CN114790847B CN114790847B CN202210423234.1A CN202210423234A CN114790847B CN 114790847 B CN114790847 B CN 114790847B CN 202210423234 A CN202210423234 A CN 202210423234A CN 114790847 B CN114790847 B CN 114790847B
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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
- E04H9/023—Bearing, supporting or connecting constructions specially adapted for such buildings and comprising rolling elements, e.g. balls, pins
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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
- E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
- E04B1/2403—Connection details of the elongated load-supporting parts
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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
- E04B1/38—Connections for building structures in general
- E04B1/58—Connections for building structures in general of bar-shaped building elements
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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
- E04H9/0237—Structural braces with damping devices
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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
- E04H9/024—Structures with steel columns and beams
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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
- E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
- E04B1/2403—Connection details of the elongated load-supporting parts
- E04B2001/2415—Brackets, gussets, joining plates
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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
- E04B1/24—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts consisting of metal
- E04B1/2403—Connection details of the elongated load-supporting parts
- E04B2001/2418—Details of bolting
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- Architecture (AREA)
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- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
Abstract
The invention discloses a rotary friction-variable self-resetting node which comprises a beam end lug plate, two column end lug plates, a self-resetting damping mechanism and a plurality of high-strength bolts, wherein the beam end lug plate is connected with the beam end lug plate; the two column end lug plates are arranged in parallel, the beam end lug plate is arranged between the two column end lug plates, a plurality of corresponding bolt holes are formed in the beam end lug plate and the column end lug plate, the central holes of the bolt holes in the beam end lug plate are round holes, the bolt holes around the central holes are arc-shaped slotted holes, the bolt holes in the column end lug plate are round holes, and the high-strength bolts penetrate through the corresponding bolt holes to connect the two column end lug plates with one beam end lug plate; the two column end lug plates and the beam end lug plate form a rotatable three-layer structure, and the column end lug plates and the beam end lug plates are reset and consume energy through the self-resetting damping mechanism after relative rotation. The rotary friction-changing self-resetting node can be applied to common beam column nodes, and is simple in structural form and convenient to assemble.
Description
Technical Field
The invention relates to the field of beam column node self-resetting, in particular to a rotary friction-changing self-resetting node.
Background
The traditional steel frame can generate larger residual deformation under the action of earthquake, thereby causing the structure to be damaged. The structure is introduced with the self-resetting energy-consuming component, so that the residual deformation of the frame is small, the repairability is strong, and the normal use function can be recovered as soon as possible after the earthquake. With the development of the design concept based on performance and earthquake resistance, the development of a structure which can be continuously used after strong earthquake and even without repair becomes a current research hotspot of earthquake engineering.
The nodes serve as important members for connection in the frame structure, and the restorability of the nodes has an important influence on the whole structure. The self-resetting node is a node capable of enabling the structure to be deformed and restored after the earthquake action, and has the advantages of the assembled node and good earthquake coping capability. The design of self-resetting node adopts the concept of ductile connection, namely when the structure receives earthquake force, the node rigidity is reduced by loosening the connection of the nodes, so that the structure can generate larger deformation, and the earthquake energy is released along with the deformation of the nodes through an additional energy dissipation device, so that the structure is not required to generate plastic deformation to consume energy, the irreversible damage of the component is avoided, and the reliability of the structure is improved.
The existing self-resetting energy consumption nodes are mostly energy-consuming by using energy-consuming mild steel, and self-resetting is performed by using a prestress technology. However, the energy-consuming soft steel needs to be externally added with a larger restoring force to overcome the damping force of the energy-consuming soft steel when the structure is self-reset, and needs to be replaced for a plurality of times after being used to ensure that the energy-consuming soft steel has sufficient energy-consuming reserve; the prestress self-resetting device has a complex structural form and has certain limit on the cross section of the beam column of the frame. Therefore, the traditional self-resetting energy consumption node has some complex technical characteristics and defects in the application of the self-resetting structure, and the research of a novel self-resetting energy consumption node plays an important role in the design of the structure.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art, and provides a rotary variable friction self-resetting node. The self-resetting node comprises two column end lug plates, a beam end lug plate and two pairs of friction discs (each pair of friction discs comprises an outer friction disc and an inner friction disc), wherein the lug plates are connected by high-strength bolts and a disc spring group formed by overlapping/involution. The slope of the friction disk is self-reset by utilizing elastic potential energy accumulated by the disc spring and the post end lug plate. The self-resetting node can realize nondestructive recovery under small and medium earthquakes and has good self-resetting capability under large earthquakes; meanwhile, the self-resetting node has the characteristic of variable friction, and the friction force is increased sharply along with the increase of the rotation angle, so that the energy consumption capability of the self-resetting node under different earthquake conditions of small earthquake and large earthquake is met.
In order to solve the technical problems, the invention adopts the following technical scheme:
a rotary friction-variable self-resetting node comprises a beam end lug plate, two column end lug plates, a self-resetting damping mechanism and a plurality of high-strength bolts; the two column end lug plates are arranged in parallel, the beam end lug plate is arranged between the two column end lug plates, a plurality of corresponding bolt holes are formed in the beam end lug plate and the column end lug plate, the central holes of the bolt holes in the beam end lug plate are round holes, the bolt holes around the central holes are arc-shaped slotted holes, the bolt holes in the column end lug plate are round holes, and the high-strength bolt penetrates through the corresponding bolt holes to sequentially connect one column end lug plate, one beam end lug plate and the other column end lug plate; the two column end lug plates and the beam end lug plate form a rotatable three-layer structure, and the column end lug plates and the beam end lug plates are reset and consume energy through the self-resetting damping mechanism after relative rotation.
As a further preferred aspect of the present invention, the self-healing damping mechanism includes two pairs of friction disc assemblies and disc spring groups; each pair of friction disc assemblies comprises an inner friction disc and an outer friction disc, a plurality of corresponding variable slope surfaces are arranged on the surfaces of one side, opposite to the inner friction disc, of the outer friction disc, the variable slope surfaces of the inner friction disc and the variable slope surfaces of the outer friction disc can be mutually matched, the friction disc assemblies are arranged between a beam end ear plate and a column end ear plate, the inner friction disc is welded on two sides of the beam end ear plate, the outer friction disc is welded on the inner side of the column end ear plate, an arc long round hole and a round hole corresponding to the beam end ear plate are formed in the inner friction disc, a bolt hole corresponding to the column end ear plate is formed in the outer friction disc, and a high-strength bolt sequentially penetrates through the bolt hole of the column end ear plate, the bolt hole of the outer friction disc, the arc long round hole or the round hole of the inner friction disc, the arc long round hole or the round hole of the beam end ear plate, the bolt hole of the other outer friction disc and the bolt hole of the other column end ear plate; the disc spring group is sleeved on the bolt rod of the high-strength bolt, one end of the disc spring group is contacted with a nut or a nut at one end of the high-strength bolt, the other end of the disc spring group is contacted with the outer surface of the post end lug plate, and the high-strength bolt applies initial pre-compression force between the friction disc assemblies through the disc spring group.
As a further preferable aspect of the present invention, the degree of the minimum lift angle of the slope surface is a, and the friction coefficient between the inner friction disc and the outer friction disc and the slope surface of the slope surface is b, and the conditions that the inner friction disc and the outer friction disc need to satisfy when the disc spring set is under the pre-pressing condition are: tan a > b.
As a further preferred aspect of the present invention, the present invention further comprises two post-end ear-plate root end plates and one beam-end ear-plate root end plate, wherein the post-end ear-plate root end plates are connected to one end of the post-end ear plate far away from the bolt hole, and the post-end ear-plate root end plates are welded to one end of the post-end ear plate perpendicular to the post-end ear plate; the beam end lug root end plate is connected to one end of the beam end lug plate, which is far away from the bolt hole, and is perpendicular to one end of the beam end lug plate, which is welded to the column end lug plate.
As a further preferred aspect of the invention, each pair of friction disk assemblies contains 5 high strength bolts, each of which applies an initial pre-compression force of F bolt The height of the variable slope top from the slope bottom is L, and the diameter of the inner ring bolt hole is R 1 The distance between the inner side wall of the outer ring bolt hole and the center of the friction disk is R 2 The distance between the outer side wall of the outer ring bolt hole and the center of the friction disk is R 3 The outer diameter of the friction disk is R 4 The rising angles of the slope surfaces at the outer diameters are respectively theta 1 ，θ 2 ，θ 3 And theta 4 The central angle corresponding to the single slope isThe friction coefficient between the sloping surfaces is mu, the friction disk is equally divided into a plurality of parts by the distance delta R from inside to outside, so that n friction areas can be formed, the radius of any friction area of the friction disk is R, and the starting torque of the variable friction self-resetting damper is
As a further preferred aspect of the present invention, there are also included a column extension beam, a column extension beam end plate, a structural beam, a column end connection high strength bolt, a beam connection high strength bolt, and a structural beam end plate; the post extension beam end plate is vertically connected to one end of the post extension beam, corresponding bolt holes are formed in the post extension beam end plate and the post end ear plate root end plate, and the post end ear plate root end plate and the post extension beam end plate are connected through post end connecting high-strength bolts; the structure beam end plate is vertically connected to one end of the structure beam, corresponding bolt holes are formed in the structure beam end plate and the beam end lug plate root end plate, and the structure beam end plate and the beam end lug plate root end plate are connected through the beam connection high-strength bolts.
In a further preferred aspect of the present invention, the column end lug plate and the beam end lug plate are made of Q355 steel.
In a further preferred aspect of the present invention, the inner friction plate and the outer friction plate are made of the same material, and are 45 steel or 40 chromium.
The invention has the following beneficial effects:
(1) The invention realizes variable friction energy consumption of the frame connecting node by utilizing the characteristics of a novel friction disk structure. The friction-changing characteristic is stepless continuous change, and the slope of the friction disk can be designed according to the requirements of the connecting nodes of the frame structure under different earthquake conditions, so that different friction-changing characteristics are realized.
(2) Compared with the traditional frame node, the rotary friction-changing self-resetting node does not need larger restoring force, and can realize self-resetting by utilizing the elastic potential energy accumulated by the belleville springs to the pressure generated by the variable slope. The butterfly spring used in the invention is widely applied in engineering, and has low cost, stable performance and good popularization.
(3) The rotary friction-changing self-resetting node is an assembled node and can be applied to beam column nodes of common frame structures. The energy consumption capacity and the node rigidity of the rotary variable friction self-resetting node can be adjusted by using the combination parameters of friction discs, column end lug plates and disc springs with different specifications so as to match beam column nodes with frame structures with different scales.
Drawings
FIG. 1 is a three-dimensional schematic view of a rotary friction-changing self-resetting node of the present invention;
FIG. 2 is a schematic view of the disassembled structure of FIG. 1;
FIG. 3 is a schematic plan view of xoz of FIG. 1;
FIG. 4 is a schematic plan view of yoz of FIG. 1;
FIG. 5 is a schematic plan view of the xoy of FIG. 1;
FIG. 6 is a three-dimensional schematic view of a beam-end ear plate;
FIG. 7 is a three-dimensional schematic view of a post end ear plate;
FIG. 8 is a three-dimensional schematic of an inner friction disk;
FIG. 9 is a three-dimensional schematic of an outer friction disk;
FIG. 10 is a schematic view of a friction disk in radial bisection;
FIG. 11 is a diagram of friction disc lift angle geometry calculation;
fig. 12 is a partial enlarged view of fig. 1.
The method comprises the following steps: 1. column end ear plates; 2. beam end ear plates; 3. an inner friction plate; 4. an outer friction plate; 5. a disc spring group; 6. a high-strength bolt; 7. a post extension beam end plate; 8. the beam is connected with a high-strength bolt; 9. the column end is connected with a high-strength bolt; 10. a post end ear plate root end plate; 11. a column extension beam; 12. a beam end ear plate root end plate; 13. a structural beam end plate; 14. and (3) a structural beam.
Detailed Description
The invention will be described in further detail with reference to the accompanying drawings and specific preferred embodiments.
In the description of the present invention, it should be understood that the terms "left", "right", "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and "first", "second", etc. do not indicate the importance of the components, and thus are not to be construed as limiting the present invention. The specific dimensions adopted in the present embodiment are only for illustrating the technical solution, and do not limit the protection scope of the present invention.
As shown in fig. 1-12, a rotary friction-variable self-resetting joint comprises a beam end lug plate 2, two column end lug plates 1, a self-resetting damping mechanism and a plurality of high-strength bolts 6. As shown in fig. 1, the x direction of the coordinate axis in the drawing is the arrangement direction of the structural beam 14 or the column extension beam 11, the y direction is the connection direction of the high strength bolt 6, z is the vertical direction, and the x, y and z axes intersect at the O point.
The column end lug plates 1 and the beam end lug plates 2 are identical in shape, the two column end lug plates 1 are oppositely arranged in parallel, a part of the beam end lug plates 2 are arranged between the two column end lug plates 1 in parallel, and the arrangement direction of the beam end lug plates 2 is opposite to that of the column end lug plates 1. Corresponding bolt hole groups are formed in the beam end lug plate 2 and the column end lug plate 1, each bolt hole group comprises a plurality of bolt holes, and each bolt hole group comprises a central hole and surrounding bolt holes. The central holes of the bolt holes on the beam end lug plates 2 are round holes, the bolt holes around the central holes are arc long round holes, the bolt holes on the column end lug plates 1 are round holes, and the high-strength bolts 6 penetrate through the corresponding bolt holes to sequentially connect one column end lug plate 1, one beam end lug plate 2 and the other column end lug plate 1; the two column end lug plates 1 and the beam end lug plate 2 form a rotatable three-layer structure, and the column end lug plate 1 and the beam end lug plate 2 reset and consume energy through a self-resetting damping mechanism after relative rotation.
The self-resetting damping mechanism comprises two pairs of friction disc assemblies and a disc spring group 5; each pair of friction disc assemblies comprises an inner friction disc 3 and an outer friction disc 4, a plurality of corresponding variable slopes are arranged on the surfaces of one side, opposite to the inner friction disc 3 and the outer friction disc 4, of each pair of friction disc assemblies, and the variable slopes of the inner friction disc 3 and the variable slopes of the outer friction disc 4 are mutually matched in an initial state. The heights of the top and the bottom of the inner and outer annular sloping surfaces of the friction disk are the same, so that the sloping surfaces of the inner and outer friction disks 4 are variable sloping surfaces, and variable friction is realized in the rotating process.
The friction disc assembly is arranged between the beam end lug plate 2 and the column end lug plate 1, the inner friction disc 3 is welded at the corresponding positions on two sides of the beam end lug plate 2, and the outer friction disc 4 is welded on the inner sides of the two column end lug plates 1, namely on the opposite sides of the two column end lug plates 1. And arc slotted holes and round holes corresponding to the beam end lug plates 2 are formed in the two inner friction plates 3, and bolt holes corresponding to the column end lug plates 1 are formed in the outer friction plates 4. Each high-strength bolt 6 sequentially passes through the bolt hole of the post end lug plate 1, the bolt hole of the outer friction disk 4, the arc-shaped oblong hole or round hole of the inner friction disk 3, the arc-shaped oblong hole or round hole of the beam end lug plate 2, the arc-shaped oblong hole or round hole of the other inner friction disk 3, the bolt hole of the other outer friction disk 4 and the bolt hole of the other post end lug plate 1; the disc spring group 5 is sleeved on the bolt rod of the high-strength bolt 6, one end of the disc spring group 5 is contacted with a nut or a nut at one end of the high-strength bolt 6, the other end of the disc spring group 5 is contacted with the outer surface of the column end lug plate 1, and initial pre-compression force between friction disc assemblies is applied by the high-strength bolt 6 through the disc spring group 5. The outer friction disc 4 and the inner friction disc 3 are mutually matched in an initial state, but are not connected, and can relatively rotate for a certain angle in the use process.
The degree of the minimum lift angle of the slope surface of the variable slope surface is a, the friction coefficient between the slope surface of the variable slope surface of the inner friction disk 3 and the slope surface of the outer friction disk 4 is b, and the conditions which need to be met when the inner friction disk 3 and the outer friction disk 4 can be reset by themselves under the pre-pressing of the disc spring group 5 are as follows: tan a > b. When the tangent value of the minimum lift angle of the slope surface is larger than the friction coefficient between the friction surfaces, the pair of friction disc assemblies can realize self-resetting under the pre-compression force of the disc spring group 5.
The high-strength bolts 6 are used for connecting the ear plates of the friction disc which are matched with each other initially, and the number and the types of the bolts are comprehensively considered according to the design requirement of the node. The disc spring group formed by stacking/involution provides precompression for the variable slope surface so that the variable slope surface is self-reset, and the type, the stacking/involution quantity and the mode of the disc springs can be selected according to the high-strength bolts 6, the required rigidity deformation and the like. The disc spring group formed by overlapping/involution is arranged on the outer side of the post end lug plate 1, and the initial pre-compression force is applied by the high-strength bolt 6.
The two column end lug root end plates 10 and the one beam end lug root end plate 12 are further included, the column end lug root end plate 10 is connected to one end, far away from the bolt holes, of the column end lug plate 1, and the column end lug root end plate 10 is welded to one end of the column end lug plate 1 perpendicular to the column end lug plate 1; the beam-end lug root end plate 12 is connected to one end of the beam-end lug plate 2 far away from the bolt hole, and the beam-end lug root end plate 12 is welded to one end of the column-end lug plate 1 perpendicular to the beam-end lug plate 2. The column end lug plate 1 and the beam end lug plate 2 are convenient to connect with other building structures.
The self-resetting node comprises 5 lug plates connected with a high-strength bolt 6, the height of the variable slope top from the slope bottom is L, and the pretightening force of the connecting bolt is F bolt Diameter of inner ring bolt holeIs R 1 The distance between the inner side wall of the outer ring bolt hole and the center of the friction disk is R 2 The distance between the outer side wall of the outer ring bolt hole and the center of the friction disk is R 3 The outer diameter of the friction disk is R 4 The rising angles of the slope surfaces at the outer diameters are respectively theta 1 ，θ 2 ，θ 3 And theta 4 The central angle corresponding to the single slope isThe friction coefficient between the sloping surfaces is mu, and the friction disc is equally divided into a plurality of parts by the distance delta R from inside to outside, so that n friction areas can be formed. The height L of the slope top from the slope bottom and the corresponding central angle of the single slope surface are +.>Radius of friction disk [0, R]And the relationship between the rise angle theta of each outer meridian slope surface is that
Further to the above, the relationship between the number n of friction areas and the radial range [0, R ] of the friction disk and the delta R of the friction disk from inside to outside is as follows
To further supplement the above, the self-resetting node comprises 2 pairs of friction disks with a starting torque M slip Friction force F corresponding to each friction area c The product of the radius R, the starting torque is about
Further describing the scheme, when the delta R tends to 0, the calculation result is the accurate solution of the starting torque of the self-resetting node
Further to the above proposal, the starting torque which can be obtained from the resetting node by utilizing the relation between the height L of the slope top from the slope bottom and the number n of the friction areas is as follows
When the torque between the beam end lug plate 2 and the column end lug plate 1 is larger than M slip At this time, the self-resetting friction damper starts the start-up operation.
The device also comprises a column extension beam 11, a column extension beam end plate 7, a structural beam 14, a column end connecting high-strength bolt 9, a beam connecting high-strength bolt 8 and a structural beam end plate 13; the post extension beam end plate 7 is vertically connected to one end of the post extension beam 11, corresponding bolt holes are formed in the post extension beam end plate 7 and the post end ear plate root end plate 10, and the post end ear plate root end plate 10 and the post extension beam end plate 7 are connected through post end connection high-strength bolts 9; the structural beam end plate 13 is vertically connected to one end of the structural beam 14, corresponding bolt holes are formed in the structural beam end plate 13 and the beam end lug plate root end plate 12, and the structural beam end plate 13 and the beam end lug plate root end plate 12 are connected through beam connection high-strength bolts 8. The column end lug plate 1 is connected with the column extension beam 11 through an end plate at the root of the column end lug plate and the column extension beam end plate 7 by using a column end connecting high-strength bolt 9. The beam end lug plate 2 is connected with the beam end plate structure beam end plate 13 through the beam end lug plate root end plate 12 and the beam end plate structure beam end plate 8 by using beam connecting high-strength bolts, so that the field assembly is convenient to realize.
The column end lug plate 1 and the beam end lug plate 2 are made of Q355 steel. Q355 is a low-alloy high-strength structural steel widely applied to bridges, vehicles, ships, buildings, pressure vessels, special equipment and the like, wherein Q means yield strength, 355 means that the yield strength of the steel is 355MPa, and the yield value of the steel is reduced along with the increase of the thickness of a material. The inner friction disc 3 and the outer friction disc 4 are made of the same material and are 45 steel or 40 chromium, and the 45 steel is characterized by higher strength and deformation resistance compared with the common A3 steel; chromium 40 is one of the most widely used alloy structural steels in the machine industry. The modified alloy has good comprehensive mechanical properties, good low-temperature impact toughness and low notch sensitivity after quenching and tempering. The hardenability of the steel is good.
When the end part of the structural beam 14 is bent and deformed under the action of bending moment, the beam end lug plate 2 is driven to rotate, so that the two inner friction discs 3 rotate. The outer sides of each pair of friction discs are respectively provided with a disc spring group 5, each disc spring group 5 is composed of a plurality of disc springs, the disc spring groups 5 on one side of each high-strength bolt 6 are connected in parallel to form the disc spring groups 5 on one side of each friction disc, and the flattening deformation of each disc spring group 5 is in the allowable rotation angle range of the inner friction disc 4 and the outer friction disc 4, so that the connection safety of the damper is ensured. The inner friction disc 3 can respectively rub against the outer friction disc 4 along the variable slope under the action of the pre-pressing force of the bolts to consume energy, and the disc spring group 5 generates elastic deformation under the pre-pressing action of the high-strength bolts 6 to provide restoring force. The range of the bolt oblong holes in the inner friction disc 3 can limit the rotation angle of the inner friction disc 3 not to exceed the angle corresponding to the single friction surface of the friction disc.
The self-resetting node adopts the slope friction disc to consume energy, can realize nondestructive recovery under small and medium shocks, and has good self-resetting capability under large shocks; meanwhile, the self-resetting node has the characteristic of variable friction, and the friction force is increased sharply along with the increase of the rotation angle, so that the energy consumption capability of the self-resetting node under different earthquake conditions of small earthquake and large earthquake is met. The invention uses the elastic potential energy accumulated by the disc spring to self-reset the pressure generated by the slope change surface. The nondestructive recovery under small and medium earthquakes is ensured, and the recovery capability under large earthquakes is still good. Compared with self-resetting material SMA wires and prestressed reinforcement, the butterfly spring used in the invention is widely applied in engineering, and has low cost, stable performance and good popularization. The rotary variable friction self-resetting node can be applied to common beam column nodes, has simple structural form and is convenient to assemble, and parameters such as the diameter of a friction disc, the lifting angle of a variable slope, the number of bolts, the shape parameters of a column end lug plate 1, the specification of a belleville spring, the stacking/involution number and the like can be flexibly selected according to the design requirement of the node to adjust the energy consumption capacity and the node rigidity of the self-resetting node. The self-resetting node can realize the energy consumption and the nondestructive recovery of a structure under a small earthquake in terms of performance by virtue of the variable friction and the resettable advantages, and has good self-resetting capability under a large earthquake; meanwhile, the self-resetting node is simple in structure and applicability, convenient and fast to construct, convenient to install, cost-saving and wide in engineering application prospect.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details of the above embodiments, and various equivalent changes can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the equivalent changes belong to the protection scope of the present invention.
Claims (6)
1. The utility model provides a rotation type becomes friction self-reset node which characterized in that: the beam end lug plate comprises a beam end lug plate (2), two column end lug plates (1), a self-resetting damping mechanism and a plurality of high-strength bolts (6);
the two column end lug plates (1) are arranged in parallel, the beam end lug plate (2) is arranged between the two column end lug plates (1), a plurality of corresponding bolt holes are formed in the beam end lug plate (2) and the column end lug plate (1), the central holes of the bolt holes in the beam end lug plate (2) are round holes, the bolt holes around the central holes are arc-shaped long round holes, the bolt holes in the column end lug plate (1) are round holes, and the high-strength bolts (6) penetrate through the corresponding bolt holes to sequentially connect one column end lug plate (1), one beam end lug plate (2) with the other column end lug plate (1); the two column end lug plates (1) and the beam end lug plate (2) form a rotatable three-layer structure, and the column end lug plate (1) and the beam end lug plate (2) are reset and consume energy through a self-resetting damping mechanism after relatively rotating;
the self-resetting damping mechanism comprises two pairs of friction disc assemblies and a disc spring group (5); each pair of friction disc assemblies comprises an inner friction disc (3) and an outer friction disc (4), a plurality of corresponding variable slope surfaces are arranged on the surface of one side, opposite to the inner friction disc (3) and the outer friction disc (4), of each pair of friction disc assemblies, the variable slope surfaces of the inner friction disc (3) and the outer friction disc (4) can be mutually matched, the friction disc assemblies are arranged between the beam end ear plate (2) and the column end ear plate (1), the inner friction disc (3) is welded on two sides of the beam end ear plate (2), the outer friction disc (4) is welded on the inner side of the column end ear plate (1), an arc-shaped long round hole and a round hole corresponding to the beam end ear plate (2) are formed in the inner friction disc (3), bolt holes corresponding to the column end ear plate (1) are formed in the outer friction disc (4), and bolts (6) sequentially penetrate through the bolt holes of the column end ear plate (1), the bolt holes of the outer friction disc (4), the arc-shaped long round hole or the round hole of the inner friction disc (3), the arc-shaped long round hole of the beam end ear plate (2), the arc-shaped long round hole of the other inner friction disc (3), the arc-shaped long round hole of the other arc-shaped long round hole of the column end ear plate (2), the arc-shaped long round hole of the other inner friction disc and the arc-shaped long round hole of the other inner friction disc (3) and the arc-shaped long round hole of the other inner friction disc (4) with the arc-shaped long round hole and the arc bolt hole and the arc-shaped long round bolt hole and the arc bolt. The disc spring group (5) is sleeved on a bolt rod of the high-strength bolt (6), one end of the disc spring group (5) is in contact with a nut or a nut at one end of the high-strength bolt (6), the other end of the disc spring group (5) is in contact with the outer surface of the post end lug plate (1), and the high-strength bolt (6) applies initial pre-compression force between friction disc assemblies through the disc spring group (5);
each pair of friction disk assemblies contains 5 high-strength bolts (6), and each high-strength bolt (6) applies an initial pre-compression force ofThe height of the slope top from the slope bottom is changed to beLThe diameter of the bolt hole of the inner ring isR 1 The inner side wall of the outer ring bolt hole is away from the center of the friction diskR 2 The outer side wall of the outer ring bolt hole is away from the center of the friction diskR 3 The outer diameter of the friction disk isR 4 The rising angles of the slopes at the outer diameters are respectively +.>，/>，/>And->The central angle corresponding to the single slope surface is +.>The friction coefficient between the slopes is +.>The friction disk is provided with +.>Is equally divided into a plurality of parts, thereby can be formednA friction area, wherein the radius of any friction area of the friction disk isRThe starting torque of the variable friction self-resetting damper is
。
2. A rotary friction-changing self-resetting node as defined in claim 1, wherein: the degree of the minimum lift angle of the slope surface of the variable slope surface isaThe friction coefficient between the inner friction disc (3) and the outer friction disc (4) is changed into the slopebThe conditions that the inner friction disc (3) and the outer friction disc (4) can be satisfied when the disc spring group (5) is under the pre-pressure and can be reset are as follows: tan (tan)a>b。
3. A rotary friction-changing self-resetting node as defined in claim 1, wherein: the device further comprises two column end lug root end plates (10) and one beam end lug root end plate (12), wherein the column end lug root end plates (10) are connected to one end, far away from the bolt holes, of the column end lug plate (1), and the column end lug root end plates (10) are welded to one end of the column end lug plate (1) perpendicular to the column end lug plate (1); the beam end lug plate root end plate (12) is connected to one end, far away from the bolt hole, of the beam end lug plate (2), and the beam end lug plate root end plate (12) is welded to one end of the column end lug plate (1) perpendicular to the beam end lug plate (2).
4. A rotary friction-changing self-resetting node as defined in claim 3, wherein: the device also comprises a column extension beam (11), a column extension beam end plate (7), a structural beam (14), a column end connecting high-strength bolt (9), a beam connecting high-strength bolt (8) and a structural beam end plate (13); the post extension beam end plate (7) is vertically connected to one end of the post extension beam (11), corresponding bolt holes are formed in the post extension beam end plate (7) and the post end lug plate root end plate (10), and the post end lug plate root end plate (10) and the post extension beam end plate (7) are connected through post end connecting high-strength bolts (9); the structure beam end plate (13) is vertically connected to one end of the structure beam (14), corresponding bolt holes are formed in the structure beam end plate (13) and the beam end lug plate root end plate (12), and the structure beam end plate (13) and the beam end lug plate root end plate (12) are connected through beam connection high-strength bolts (8).
5. A rotary friction-changing self-resetting node as defined in claim 1, wherein: the column end lug plate (1) and the beam end lug plate (2) are made of Q355 steel.
6. A rotary friction-changing self-resetting node as defined in claim 1, wherein: the inner friction disc (3) and the outer friction disc (4) are made of the same material and are made of 45 steel or 40 chromium.
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| CN202210423234.1A CN114790847B (en) | 2022-04-21 | 2022-04-21 | Rotary friction-variable self-resetting node |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113833144B (en) * | 2021-09-29 | 2023-05-16 | 东南大学 | Friction energy consumption rotary self-resetting node device |
| CN115949149B (en) * | 2022-12-12 | 2023-07-25 | 哈尔滨工业大学 | Disc spring-SMA rod combined bending-resistant energy-consumption self-resetting steel beam column node with pin joint center support |
| CN118128212B (en) * | 2024-03-25 | 2024-07-19 | 兰州理工大学 | Multistage friction-variable energy consumption self-resetting assembled beam column node |
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