CN113374770A - Movable self-resetting anti-pulling shear connector and design method thereof - Google Patents
Movable self-resetting anti-pulling shear connector and design method thereof Download PDFInfo
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- CN113374770A CN113374770A CN202110592146.XA CN202110592146A CN113374770A CN 113374770 A CN113374770 A CN 113374770A CN 202110592146 A CN202110592146 A CN 202110592146A CN 113374770 A CN113374770 A CN 113374770A
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- 238000000034 method Methods 0.000 title claims description 25
- 238000013461 design Methods 0.000 title claims description 14
- 239000004567 concrete Substances 0.000 claims abstract description 68
- 238000010008 shearing Methods 0.000 claims abstract description 40
- 230000004323 axial length Effects 0.000 claims description 61
- 238000009434 installation Methods 0.000 claims description 43
- 238000012360 testing method Methods 0.000 claims description 11
- 241000587161 Gomphocarpus Species 0.000 claims description 10
- 238000010276 construction Methods 0.000 claims description 8
- 230000006378 damage Effects 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 abstract description 7
- 239000002131 composite material Substances 0.000 abstract description 3
- 238000005452 bending Methods 0.000 description 18
- 229910000831 Steel Inorganic materials 0.000 description 17
- 239000010959 steel Substances 0.000 description 17
- 239000000463 material Substances 0.000 description 12
- 238000003466 welding Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 4
- 238000012938 design process Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010561 standard procedure Methods 0.000 description 2
- 238000007655 standard test method Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000009916 joint effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000001915 proofreading effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
- F16B35/02—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws divided longitudinally
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
- F16B35/04—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
- F16B35/041—Specially-shaped shafts
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
Abstract
The invention provides a movable self-resetting anti-pulling shear connector, which comprises a nail cap and a bolt rod which are sequentially arranged, wherein the radial width of the nail cap is greater than that of the bolt rod, the bolt rod comprises an anti-pulling bolt rod and an anti-shearing bolt rod, one end of the anti-pulling bolt rod is connected with the nail cap, a resettable node is arranged between the other end of the anti-pulling bolt rod and the anti-shearing bolt rod, the anti-pulling bolt rod can move along the direction opposite to the shearing force applied to the anti-pulling bolt rod through the resettable node, the resettable node comprises an elastic piece, when the connector is applied, when the load reaches a certain value, the anti-pulling bolt rod can relatively rotate due to the resettable node, the relative position of the anti-pulling bolt rod in concrete is unchanged, the axial force acting position acting on the nail cap is not changed, so that the anti-pulling bolt rod does not generate additional eccentric moment due to the shearing deformation of the anti-pulling bolt rod, and the generation of lifting displacement is effectively avoided, thereby improving the anti-pulling and anti-shearing capability of the connecting piece and improving the service performance and time of the steel-concrete composite structure.
Description
Technical Field
The invention belongs to the field of construction auxiliary tools, and particularly relates to a movable self-resetting anti-pulling shear connector and a design method thereof.
Background
The steel-concrete combined structure is composed of steel, concrete and connecting pieces, wherein the steel has good tensile property and the concrete has good compressive property, and the connecting pieces are used for effectively combining the steel and the concrete to exert respective advantages and are widely applied to the construction of roads, bridges and the like.
At present, the stud is used as a common connecting piece, the tail end of the stud is welded with steel, and then concrete is poured, so that the connecting performance of a steel-concrete combined structure can be enhanced, but the traditional stud is single in use function; on one hand, as the stud is a flexible connecting piece, the stud generates shear deformation and axial deformation under the action of shear force and axial force (pull force) in the application process, so that interface sliding displacement and lifting displacement occur at the joint of steel and concrete, the steel and concrete are deformed incoordinatively and have different curvatures, and the interaction between the steel and the concrete is represented as incomplete joint work, so that the rigidity of the section of the steel-concrete combined structure is reduced, the deformation is increased, the bearing capacity is reduced, and the long-term stable use is not facilitated; meanwhile, during the use process of the pin, the shearing force applied to the section, which is closer to the connection between the pin and the steel material, is larger, but in the design process, the diameter of the pin is the same, so that the section, which is far from the connection between the pin and the steel material, is not fully used, and the insufficient utilization of the material is caused.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a movable self-resetting anti-pulling shear connector and a design method thereof, and solve the problems in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a movable anti-pulling shear connector from restoring to throne, is including the nut and the stock that set gradually, the radial width of nut is greater than the radial width of stock, the stock includes anti-pulling stock and shear bolt, anti-pulling stock one end with the nut is connected, the other end with be equipped with the node that can reset between the stock that shears, anti-pulling stock can pass through the node that can reset along rather than the opposite direction motion of the shear force that receives, the node that can reset includes the elastic component.
The resettable node further comprises a first mounting part arranged at one end, close to the shear resistant bolt, of the anti-pulling bolt, the radial width of the first mounting part is smaller than that of the anti-pulling bolt, a first mounting surface and a second mounting surface are formed on the two sides of the end part of the anti-pulling bolt, and a first mounting hole is formed in the first mounting part in the radial direction of the first mounting part;
the anti-pulling bolt comprises a first mounting groove, a first mounting table and a second mounting table, wherein the first mounting groove, the first mounting table and the second mounting table are arranged at one end, close to the anti-pulling bolt, of the anti-pulling bolt;
the first mounting table and the second mounting table are respectively provided with a second mounting hole and a third mounting hole along the radial direction of the shear-resistant bolt rod, and the second mounting hole and the third mounting hole are connected with the first mounting hole through limiting pieces;
the first installation platform and the second installation platform are respectively provided with a second installation groove along the axial direction of the shear-resistant bolt rod, one end of the elastic piece is arranged in the second installation groove and connected with the second installation groove, the other end of the elastic piece is connected with the corresponding first installation surface or second installation surface, and a first gap is formed between the elastic piece and the first installation surface or the second installation surface.
The first mounting table and the second mounting table are respectively and symmetrically provided with two second mounting grooves along the center lines of the first mounting table and the second mounting table, and the second mounting grooves are distributed on the cross section of the shear resistant bolt at intervals.
The locating part includes the connecting rod and locates the fixed part at connecting rod both ends, the axial length of connecting rod equals the radial width of shear bolt pole, and the width of fixed part is greater than the width of second mounting hole and third mounting hole, the connecting rod with second mounting hole is articulated with the third mounting hole.
The anti-pulling bolt is characterized in that an external thread is arranged on the outer peripheral surface of the anti-pulling bolt along the axial direction of the anti-pulling bolt, a threaded hole is arranged on the nail cap along the axial direction of the nail cap, the anti-pulling bolt is in threaded connection with the nail cap, and the axial length of the external thread is greater than that of the threaded hole.
The proportion of the axial length of the shear bolt rod to the axial length of the connecting piece is/, and the axial length of the elastic piece is equal to the diameter of the bolt rod.
A method of designing a movable self-resetting anti-pullout shear connector, the method comprising:
s10: determining the destruction load Pu of the used concrete according to the environment of the target construction site;
s20: determining the diameter d of the bolt according to the breaking load Pu of the concretes；
S30: according to the diameter d of the pinsDetermining the radial extension d of the nail head0Diameter d of the nail headhAxial length t of the nail headh；
S40: according to the diameter d of the pinsDiameter d of the nail headhDetermining the axial length h of the bolt0And the axial length h of the connector;
s50: according to the axial length h of the bolt0Determining the axial length h of a shear bolt1Axial length h of anti-pulling bolt2Axial length h of the elastic member3。
The breaking load Pu of the concrete in the step S10:
Pu＝fc1·A
wherein f isc1The concrete standard test piece compressive strength is as follows: n/mm2(ii) a A is the contact area of a concrete standard test piece in mm2(ii) a Pu is the breaking load of concrete, unit: n/mm2The unit: n/mm2。
The diameter d of the pin in the step S20s：
Wherein d issDiameter of the pin, unit: mm; a. thesIs the cross-sectional area of the bolt, in units: mm is2(ii) a Pi is a physical constant; ecIs the concrete elastic modulus, unit: n/mm2；fc2Is the concrete prism compressive strength, unit: n/mm2。
The radial outward extension d of the nail cap (1) in the S300：
Diameter d of the nail headh：
dh＝2d0+ds
Axial length t of the nail headh：
S0＝πd0(d0+ds)
Wherein d is0The radial overhanging length of the nail head is shown as unit: mm; dhDiameter of the nail head, unit: mm; t is thIs the axial length of the nail cap, unit: mm; s0Is the effective contact area of the nail cap overhanging part and the concrete, and the unit is: mm is2；fysIs the tensile strength of the pin, unit: n/mm2。
Axial length h of the pin in S400：
Axial length h of the connector:
h＝h0+th
axial length h of shear bolt1：
Axial length h of the elastic member3：
h3＝ds
Axial length h of anti-pulling bolt2：
h2＝h0-h1-h3
Wherein h is0Is the axial length of the bolt rod, in units: mm; h is1Axial length of the shear bolt, unit: mm; h is2Axial length of the anti-pulling bolt rod, unit: mm; h is3Axial length of the elastic member, unit: mm; f. oftIs the concrete tensile strength, unit: n/mm2。
Compared with the prior art, the invention has the following technical effects:
the invention relates to a movable self-resetting anti-pulling shear connector and a design method thereof, wherein an anti-pulling bolt rod and a shear bolt rod are arranged, a resettable node is arranged between the anti-pulling bolt rod and the shear bolt rod, when the connector is applied, one end of the shear bolt rod is welded with steel and then concrete is poured, and the shear bolt rod and the anti-pulling bolt rod bear shear force F simultaneouslySAxial force FNThe anti-pulling performance of the connecting piece is improved through the nail cap, when the shear-resistant bolt rod generates shear deformation and axial deformation after the load reaches a certain value, at the moment, the anti-pulling bolt rod can rotate relatively due to the resettable node between the anti-pulling bolt rod and the shear-resistant bolt rod, and particularly, the moving direction of the anti-pulling bolt rod and the shearing force F borne by the anti-pulling bolt rodSIn the opposite direction, enables the anti-pulling bolt to overcome the shearing force F in the concreteSTo thereby maintain the anti-pullout plugThe relative position of the rod in the concrete is not changed, and the axial force (tension) F acted on the nail headNThe action position of the anti-pulling bolt rod can not be changed, so that the anti-pulling bolt rod can not generate bending moment due to shearing deformation, and the elastic piece is arranged, so that the bending moment generated by part of the anti-pulling bolt rod under the action of shearing force and axial force (pulling force) can be counteracted, therefore, the integral additional eccentric moment of the connecting piece is only left in the residual bending moment M of the anti-pulling bolt rod when the connecting piece is applied, so that the integral additional eccentric distance of the connecting piece is greatly reduced, the lifting displacement is effectively avoided, the anti-pulling and anti-shearing capability of the connecting piece is improved, and the service performance and the service time of the steel-concrete combined structure are improved.
(II) the design method of the invention considers the shearing force F in the design process of the connecting pieceSWith axial force (pull) FNThe joint action of the bolt nail and the connecting piece can damage the connecting piece to improve the load bearing performance of the connecting piece and further improve the load bearing capacity of concrete, compared with the common bolt nail, the connecting piece of the embodiment has the advantages that under the same axial deformation displacement, the load bearing capacity of the connecting piece is large, and is 2 times higher than that of the common bolt nail, the material of the connecting piece obtained by the design method is saved, the anti-pulling capacity of the connecting piece is guaranteed, and meanwhile, the material is fully utilized.
Drawings
FIG. 1 is a schematic view of the overall structure of the movable self-resetting anti-pulling shear connector of the present invention;
FIG. 2 is a schematic structural view of the anti-pullout plug stem of the present invention;
FIG. 3 is a schematic structural view of the anti-pullout plug stem of the present invention;
FIG. 4 is a schematic structural view of a shear bolt bar of the present invention;
FIG. 5 is a cross-sectional view of the shear stud connecting end of the present invention;
FIG. 6 is a schematic structural diagram of a position limiting element according to the present invention;
FIG. 7 is a schematic structural view of the nut of the present invention;
FIG. 8 is a force analysis diagram of the movable self-resetting anti-pullout shear connector of the present invention in use;
FIG. 9 is a comparison of the force application of the connector of the present invention with a conventional peg;
FIG. 10 is a label diagram of the parameters of the design method of the present invention.
The meaning of the individual reference symbols in the figures is:
1-a nut, 2-an anti-pulling bolt, 3-a shear bolt, 4-a limiting part, 5-steel, 201-a first mounting part, 202-a first mounting surface, 203-a second mounting surface, 204-a first mounting hole, 301-a first mounting groove, 302-a first mounting table, 303-a second mounting table, 304-a second mounting hole, 305-a third mounting hole, 306-a second mounting groove, 307-an elastic part, 308-a welding table, 309-a first gap, 310-a second gap, 401-a connecting rod, 402-a fixing part, 11-a threaded hole and 21-an external thread.
The present invention will be explained in further detail with reference to examples.
Detailed Description
The following embodiments of the present invention are provided, and it should be noted that the present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention are within the protection scope of the present invention.
Herein, shear force means: also called shear force, using the symbol FSRepresents: the shearing is a relative dislocation deformation phenomenon which occurs to the cross section of a material (referred to as the end surface of a shear resistant bolt rod connected with steel) along the action direction of a pair of transverse external forces (i.e. the force perpendicular to the action surface, referred to as the outer peripheral surface of a bolt nail) which are close to each other, have the same size and point opposite, the force which can cause the shearing deformation of the material is referred to as shearing force or shearing force, the section which causes the shearing deformation is referred to as a shearing surface, and the key for judging whether the shearing is the relative dislocation of the cross section of the material;
axial force (pull force), which is an internal force coinciding with the axis of the connecting element, is called axial force and is denoted by the symbol FNIndicating that when the connection is in Tension, the axial force is a tensile force (Tension) that is directed away from the cross-section; when the connection is compressed, the axial force is the Compression force (Compression), which is directed towards the cross section; it is generally stated that: tensile forces are indicated by positive signs and compressive forces by negative signs, herein connectedThe connecting piece is subjected to an axial force (tensile force).
Directional terms such as "radial" and "axial" are consistent with the drawings.
Additional eccentricity: the sum of bending moments suffered by the bolt or the whole connecting piece is indicated, and the additional eccentricity of the common bolt is the bending moment suffered by the whole common bolt, as shown by a letter M in figure 8 (a).
The additional eccentricity of the movable self-resetting anti-pulling shear connector is the sum of the bending moments of the anti-pulling bolt rod 2 and the anti-pulling bolt rod 3, and as shown in fig. 8(b), the relative position of the anti-pulling bolt rod 2 in concrete after being subjected to shearing force and axial force (tensile force) is unchanged, so that no bending moment is generated, namely the bending moment is zero;
the elastic piece can counteract bending moment generated by part of the shear-resisting bolt rod under the action of shearing force and axial force (tensile force), so that the bending moment of the shear-resisting bolt rod 3 is residual bending moment M2, and the additional eccentricity of the movable self-resetting anti-pulling shear connector is residual bending moment M2.
Example 1:
a movable self-resetting anti-pulling shear connector is shown in figures 1-8 and comprises a screw cap 1 and a bolt rod which are sequentially arranged, wherein the radial width of the screw cap 1 is larger than that of the bolt rod, the bolt rod comprises an anti-pulling bolt rod 2 and a shear bolt rod 3, one end of the anti-pulling bolt rod 2 is connected with the screw cap 1, a resettable node is arranged between the other end of the anti-pulling bolt rod and the shear bolt rod 3, the anti-pulling bolt rod 2 can move in the direction opposite to the shearing force applied to the anti-pulling bolt rod through the resettable node, and the resettable node comprises an elastic piece 307.
In the movable self-resetting anti-pulling shear connector of the embodiment, as shown in fig. 8, by arranging the anti-pulling bolt 2 and the anti-pulling bolt 3 and arranging the resettable node between the anti-pulling bolt 2 and the anti-pulling bolt 3, when in application, after one end of the anti-pulling bolt 3 is welded with the steel 5, concrete is poured, and the anti-pulling bolt 3 and the anti-pulling bolt 2 bear the shearing force F simultaneouslySAxial force FNThe anti-pulling performance of the connecting piece is improved through the nail cap 1, when the load reaches a certain value, the anti-pulling bolt rod 3 generates shear deformation and axial deformation, and at the moment, the anti-pulling bolt rod 2 and the anti-pulling bolt rod 3 are connectedThe resettable nodes between the two parts enable the anti-pulling bolt rod 2 to rotate relatively, specifically, the moving direction of the anti-pulling bolt rod 2 and the shearing force F applied to the anti-pulling bolt rodSIn the opposite direction, enables the anti-pulling bolt 2 to overcome the shearing force F in the concreteSThereby keeping the relative position of the anti-pulling bolt rod 2 in the concrete unchanged, and the axial force (pulling force) F acted on the nail cap 1NThe action position of the shear resistant bolt rod 2 can not be changed, so that the bending moment generated by the shear deformation of the shear resistant bolt rod 2 can not be generated, and the elastic part 307 can be arranged to offset the bending moment generated by part of the shear resistant bolt rod 3 under the action of shearing force and axial force (pulling force), so that the whole additional eccentric moment of the connecting piece is only left in the residual bending moment M2 of the shear resistant bolt rod 3 when the connecting piece is applied, and therefore, the whole additional eccentric distance of the connecting piece is greatly reduced, the lifting displacement is effectively avoided, the anti-pulling and anti-shearing capacity of the connecting piece is improved, and the service performance and the service time of the steel-concrete combined structure are improved.
In the present embodiment, fig. 8(a) in the drawings shows a force diagram of a common peg, and fig. 8(b) shows a force diagram of a connector of the present embodiment; the materials of the anti-pulling bolt rod 2 and the anti-shearing bolt rod 3 adopt ML15, Q345, Q390, Q420 or Q460.
As a preferable scheme of this embodiment, a first mounting portion 201 is disposed at one end of the anti-pulling bolt 2 close to the shear bolt 3, a radial width of the first mounting portion 201 is smaller than a radial width of the anti-pulling bolt, a first mounting surface 202 and a second mounting surface 203 are formed with both sides of an end portion of the anti-pulling bolt 2, and a first mounting hole 204 is disposed on the first mounting portion 201 along a radial direction thereof;
one end of the shear bolt rod 3, which is close to the anti-pulling bolt rod 2, is provided with a first installation groove 301, a first installation platform 302 and a second installation platform 303, and the first installation part 201 is arranged in the first installation groove 301, and a second gap 310 is arranged between the first installation groove and the first installation groove;
the first mounting table 302 and the second mounting table 303 are respectively provided with a second mounting hole 304 and a third mounting hole 305 along the radial direction of the shear bolt 3, and the second mounting hole 304 and the third mounting hole 305 are connected with the first mounting hole 204 through a limiting member 4;
the first installation platform 302 and the second installation platform 303 are respectively provided with a second installation groove 306 along the axial direction of the shear bolt 3, one end of the elastic member 307 is arranged in the second installation groove 306 and connected with the second installation groove 306, the other end of the elastic member is connected with the corresponding first installation surface 202 or second installation surface 203, and a first gap 309 is arranged between the elastic member and the first installation surface 202 or second installation surface 203.
The first mounting portion 201 can be inserted into the first mounting groove 301, the first mounting surface 202 and the second mounting surface 203 are provided to provide a mounting surface for the anti-pulling bolt rod with good elasticity 307, the first mounting hole 204 is provided to connect the first mounting portion 201 with the first mounting groove 301, the anti-pulling bolt rod 2 and the anti-shearing bolt rod 3 are further connected and fixed in the radial direction, the second mounting groove 306 is provided to provide a setting position for the elastic member 307, and the first mounting surface 202 and the first mounting platform 302, the second mounting surface 203 and the second mounting platform 303 are connected through the elastic member 307, so that the anti-pulling bolt rod 2 and the anti-shearing bolt rod 3 are further connected elastically in the axial direction through the elastic member 307.
In this embodiment, the first gap 309 and the second gap 310 are provided to ensure that the anti-pulling bolt 2 and the shear bolt 3 can rotate relatively after the connection process.
The elastic part 307 in the implementation adopts a high-strength prestressed spring, and the anti-pulling bolt rod 2 is fixed in position in the construction process, provides self-resetting capability when deviating, and keeps the connection performance of the connecting piece, so that the anti-pulling capability of the connecting piece is improved; the shear-resistant bolt rod 3 can generate bending moment due to the existence of shearing force, the high-strength prestressed spring can offset partial bending moment, and the residual bending moment M2 at the end part of the shear-resistant bolt rod 3 is greatly reduced compared with a common bolt nail, so that the shear-resistant capability is partially improved, and meanwhile, pretension force can be provided for the anti-pulling bolt rod 2, and the initial anti-pulling capability of the connecting piece is improved.
As a preferable scheme of this embodiment, two second installation grooves 306 are symmetrically arranged on the first installation platform 302 and the second installation platform 303 along the central lines thereof, and the second installation grooves 306 are distributed on the cross section of the shear bolt 3 at intervals.
In the embodiment, two second installation grooves 306 are respectively arranged on the first installation platform 302 and the second installation platform 303, the second installation grooves 306 are uniformly distributed on the cross section of the shear resistant bolt 3, the two ends of the elastic member 307 are connected in a welding manner, in order to facilitate welding work on the shear resistant bolt 3, a welding platform 308 is arranged on each second installation groove 306 to increase the welding end surface, and to facilitate stable connection of the elastic member 307 on the shear resistant bolt 3.
As a preferable solution of this embodiment, the limiting member 4 includes a connecting rod 401 and fixing portions 402 disposed at two ends of the connecting rod 401, an axial length of the connecting rod 401 is equal to a radial width of the shear bolt 3, and a width of the fixing portion 402 is greater than widths of the second mounting hole 304 and the third mounting hole 305.
Wherein, playing the effect of radial connection resistance to plucking vaulting pole 2 and shear-resisting vaulting pole 3 through setting up connecting rod 401, fixed part 402 combines with the outer peripheral face of shear-resisting vaulting pole 3, makes the setting of locating part 4 more stable, and is concrete, and fixed part 402 adopts the welding with connecting rod 401, and in this embodiment, fixed part 402 encircles along the tip of shear-resisting vaulting pole 3 and sets up, and the quantity is 4, the fixed part 402 of being convenient for is connected with the outer peripheral face of shear-resisting vaulting pole 3 is stable.
As a preferable scheme of this embodiment, an external thread 21 is provided on the outer circumferential surface of the anti-pulling bolt 2 along the axial direction thereof, a threaded hole 11 is provided on the nut 1 along the axial direction thereof, the anti-pulling bolt 2 is in threaded connection with the nut 1, and the axial length of the external thread 21 is greater than the axial length of the threaded hole 11.
The purpose of the external thread 21 is to increase the mechanical engaging force between the pulling-resistant bolt rod 2 and the concrete interface, improve the bonding performance of the steel-concrete composite structure section, and simultaneously improve the friction force F of the steel-concrete composite structure sectionfThe pulling force born by the anti-pulling bolt rod 2 can be shared, so that the connecting piece and the concrete can work together better, and the anti-pulling performance of the connecting piece is ensured; in order to make the connection between the anti-pulling bolt rod 2 and the nail cap 1 more firm, the threaded hole 11 can adopt a fine thread, and the external thread 21 is corresponding to the corresponding partAnd matching, when concrete or other parts of the connecting piece are damaged, the nail cap can not be damaged, so that the anti-pulling capacity of the connecting piece is ensured and materials are fully utilized.
As a preferable scheme of the embodiment, the proportion of the axial length of the shear bolt rod 3 to the axial length of the bolt pin is 2/5-3/5: 1, and the axial length of the elastic piece 307 is equal to the diameter of the bolt rod.
Wherein, on the bolt rod individual, the part contacted with the steel material has the largest deformation which is not negligible; the deformation of the opposite end is small, most of the stud stress is mainly concentrated on the part from the root of the stud to 2/5-3/5 of the length of the stud through stud tests and simulation, so that the length of the shear-resistant stud 3 is 2/5-3/5 of the length of the connector, the anti-pulling stud 2 can rotate relatively while the bearing capacity of the connector is not reduced obviously, the relative position of the anti-pulling stud 2 in concrete is unchanged, the action position of the tensile force acting on the nut cannot be changed, and therefore the anti-pulling stud 2 cannot generate additional eccentric moment due to shear deformation, so that the anti-pulling capacity of the connector is improved, the length of the shear-resistant stud 3 in the embodiment is 3/5 of the connector, the axial length of the elastic piece 307 is equal to the maximum rotation range of the anti-pulling stud after being stressed, the aim that the anti-pulling bolt rod does not rotate relative to the concrete is achieved.
In the use process of the connecting piece of the embodiment, the shearing force applied to the connecting part of the shear resistant bolt rod 1 and the steel is large, and the anti-pulling bolt rod 2 is far away from the steel, so that the influence of the non-bearing shearing force of the anti-pulling bolt rod 2 on the overall shearing resistance of the connecting piece is small, and therefore the anti-pulling performance and the anti-shearing performance can be effectively guaranteed.
The using process of the embodiment is as follows:
firstly, the elastic piece 307 is arranged in the second mounting groove 306, one end of the elastic piece is welded with the second mounting groove 306, and the other end of the elastic piece is correspondingly welded with the first mounting surface 202 and the second mounting surface 203;
then, the connecting rod 401 is inserted through the second mounting hole 304, the first mounting hole 204 and the third mounting hole 305, and the fixing portion 402 is welded to the outer circumferential surfaces of the connecting rod 401 and the shear bolt 3 to connect the connecting rod 401 and the shear bolt 3, thereby completing the connection between the anti-pulling bolt 2 and the shear bolt 3;
and finally, welding the tail end of the shear-resistant bolt rod 3 with steel, and pouring concrete on the connecting piece to finish the construction of the steel-concrete combined structure.
Example 2:
the embodiment discloses a design method of the movable self-resetting anti-pulling shear connector in the embodiment 1, which comprises the following steps:
s10: determining the destruction load Pu of the used concrete according to the environment of the target construction site;
s20: determining the diameter d of the bolt according to the breaking load Pu of the concretes；
S30: according to the diameter d of the pinsDetermining the radial extension d of the nail head 10Diameter d of the nail head 1hThe axial length t of the nail head 1h；
S40: according to the diameter d of the pinsDiameter d of the nail head 1hDetermining the axial length h of the bolt0And the axial length h of the connector;
s50: according to the axial length h of the bolt0Determining the axial length h of the shear bolt 31Axial length h of anti-pulling bolt rod 22And the axial length h of the elastic member 3073。
The design method of the embodiment comprehensively considers the shearing force F of the connecting piece in useSWith axial force (pull) FNAs shown in fig. 9, the connecting member of this embodiment is shown in fig. 9(b) compared with the common peg, and as shown in fig. 9(a), under the same deformation displacement, the load carried by the connecting member of this embodiment is larger than the load carried by the common peg, which is 2 times higher than the load carrying capacity of the common peg.
As a preferable solution of this embodiment, a bridge is selected as an application environment of the connector design of this embodiment, and as shown in table 1, various design parameters in practice are given.
TABLE 1
As a preferable aspect of this embodiment, the breaking load Pu of the concrete in step S10:
Pu＝fc1·A
wherein f isc1The concrete standard test piece compressive strength is as follows: n/mm2In this embodiment, fc1The concrete (in a cube shape) compressive strength standard value is multiplied by a partition coefficient, the concrete compressive strength standard value refers to a cube standard test piece with the side length of 150mm manufactured and maintained according to a standard method, and the cube compressive strength with 95% guarantee rate is measured by a standard test method in the 28d age period, in the embodiment, a bridge is selected as a target construction site, the concrete grade can be C25-C50, specifically, C30 is taken as an example, f isc1The value is 14.3N/mm2(ii) a A is the contact area of the standard test piece in mm2In this embodiment, the standard test piece is a 150mm cubic test piece, and its value is 22500mm2。
Specifically, the breaking load P of the concrete in this exampleu＝14.3*22500＝321750N。
As a preferable mode of the present embodiment, the diameter d of the pin in the step S20s：
Wherein A issIs the cross-sectional area of the bolt, in units: m is2；EcThe value of the concrete elastic modulus is 30000N/mm2；fc2Prismatic axial compressive strength; f. ofc2The standard method is used for manufacturing a test piece with the side length of 150 mm-300 mm through maintenance, and the standard test method is used in the 28d ageMeasured cubic compressive strength with 95% proof-reading, f in this examplec2The value is 22.8N/mm2。
According to the above formula
Computing
In particular, the diameter of the pin in this embodiment
In the design method of the embodiment, in the design process, the shear resistant bolt 3 bears most of the shear force F applied to the connecting pieceSThe breaking load Pu of the concrete being entirely determined by the shear force FSProviding, designing the diameter d of the pinsIn the process, the influence of the destructive load Pu on the connecting piece is comprehensively considered, so that the calculation process of the embodiment meets the requirement of the lifting of the bearing load of the connecting piece.
As a preferable scheme of the embodiment, the radial outward extending length d of the nail cap (1) in the S300：
Diameter d of the nail headh：
dh＝2d0+ds
Axial length t of the nail headh：
S0＝πd0(d0+ds)
Wherein S is0Is the effective contact area of the nail cap overhanging part and the concrete, and the unit is: m is2，fysIn the present embodiment, ML15 material is used as the bolt type number for the tensile strength of the bolt, so fysValue of 400N/mm2。
Specifically, the radially outward extending length d of the nut 1 in this embodiment0
Diameter d of the nail headh＝2*11+34＝56mm；
Effective contact area S between the overhanging part of the nail cap and concrete0＝π*11*(11+34)＝1461mm2
Axial length t of the nail headh：
As a preferable mode of this embodiment, the axial length h of the pin in S40 is0：
Axial length h of the connector:
h＝h0+th
wherein f istThe tensile strength of the concrete is 1.43N/mm in unit of mm2。
In particular, the axial length h of the bolt in this embodiment0
Axial length h of the connecting piece
h＝66+15＝81mm。
The connecting piece is provided with the elastic piece, so that the movable function of the connecting piece is realized, and the connecting piece is large in size in the practical application processPartial shear force FSThe shear force borne by the shear resistant pin 2, and therefore the shear force borne by the anti-pulling pin 3, can be ignored, and in order to prevent the concrete from breaking prior to the invention, only the axial force (tensile force) F is consideredNInfluence on the connecting part, axial force (tension) FNThe axial length of the connecting piece is calculated according to the tensile strength of the bolt rod and the tensile strength of the concrete.
As a preferred solution of this embodiment, the axial length h of the shear bolt 31：
In order to maximize the rotation of the movable area when the movable area is subjected to shearing forces in different directions and to achieve the purpose that the anti-pulling bolt rod does not rotate relative to the concrete, h is designed in the embodiment3＝dsA rotation of the elastic part 307 of the movable region of ± 90 ° is achieved, 11 mm.
Axial length h of anti-pulling bolt rod (2)2：
h2＝h0-h1-h3＝28.6mm
Specific parameter units are given in table 2 for the respective physical quantity parameters referred to in the present embodiment.
TABLE 2
Claims (10)
1. A movable self-resetting anti-pulling shear connector comprises a nail cap (1) and a bolt rod which are sequentially arranged, wherein the radial width of the nail cap (1) is greater than that of the bolt rod,
the bolt rod comprises an anti-pulling bolt rod (2) and a shearing-resistant bolt rod (3), one end of the anti-pulling bolt rod (2) is connected with the nut (1), a resettable node is arranged between the other end of the anti-pulling bolt rod and the shearing-resistant bolt rod (3), the anti-pulling bolt rod (2) can move in the direction opposite to the shearing force applied to the anti-pulling bolt rod through the resettable node, and the resettable node comprises an elastic piece (307).
2. The movable self-resettable anti-pullout shear connector of claim 1,
the resettable node further comprises:
the first mounting part (201) is arranged at one end, close to the shear-resistant bolt rod (3), of the anti-pulling bolt rod (2), the radial width of the first mounting part (201) is smaller than that of the anti-pulling bolt rod, a first mounting surface (202) and a second mounting surface (203) are formed on the two sides of the end part of the anti-pulling bolt rod (2), and a first mounting hole (204) is formed in the first mounting part (201) along the radial direction of the first mounting part;
the anti-pulling bolt comprises a first mounting groove (301), a first mounting table (302) and a second mounting table (303), wherein the first mounting groove (301), the first mounting table (302) and the second mounting table (303) are arranged at one end, close to the anti-pulling bolt (2), of the anti-pulling bolt (3), and a second gap (310) is formed between the first mounting groove (301) and the first mounting groove;
the first mounting platform (302) and the second mounting platform (303) are respectively provided with a second mounting hole (304) and a third mounting hole (305) along the radial direction of the shear bolt rod (3), and the second mounting hole (304) and the third mounting hole (305) are connected with the first mounting hole (204) through a limiting piece (4);
the first installation platform (302) and the second installation platform (303) are respectively provided with a second installation groove (306) along the axial direction of the shear bolt rod (3), one end of the elastic piece (307) is arranged in the second installation groove (306) and connected with the second installation groove, the other end of the elastic piece is connected with the corresponding first installation surface (202) or second installation surface (203), and a first gap (309) is arranged between the first installation surface (202) or the second installation surface (203).
3. The movable self-resetting anti-pulling shear connector as claimed in claim 2, wherein the first mounting platform (302) and the second mounting platform (303) are respectively provided with two second mounting grooves (306) symmetrically along the central line thereof, and the second mounting grooves (306) are distributed on the cross section of the shear bolt rod (3) at intervals.
4. The movable self-resetting anti-pulling shear connector according to claim 2, wherein the limiting member (4) comprises a connecting rod (401) and fixing portions (402) arranged at two ends of the connecting rod (401), the axial length of the connecting rod (401) is equal to the radial width of the shear plug rod (3), the width of the fixing portion (402) is greater than the widths of the second mounting hole (304) and the third mounting hole (305), and the connecting rod (401) and the second mounting hole (304) are hinged to the third mounting hole (305).
5. The movable self-resetting anti-pulling shear connector according to claim 1, wherein an external thread (21) is provided on the outer circumferential surface of the anti-pulling bolt rod (2) along the axial direction thereof, a threaded hole (11) is provided on the nut (1) along the axial direction thereof, the anti-pulling bolt rod (2) is in threaded connection with the nut (1)2, and the axial length of the external thread (21) is greater than the axial length of the threaded hole (11).
6. The movable self-resetting anti-pulling shear connector as claimed in claim 1, wherein the ratio of the axial length of the shear plug rod (3) to the axial length of the connector is 2/5-3/5: 1, and the axial length of the elastic member (307) is equal to the diameter of the plug rod.
7. A method for designing a movable self-resetting anti-pullout shear connector according to any one of claims 1-6, comprising:
s10: determining the destruction load Pu of the used concrete according to the environment of the target construction site;
s20: determining the diameter d of the bolt according to the breaking load Pu of the concretes；
S30: according to the diameter d of the pinsDetermining the radial extension d of the nail head (1)0Diameter d of the nail cap (1)hThe axial length t of the nail head (1)h；
S40: according to the boltDiameter d of the rodsDiameter d of the nail cap (1)hDetermining the axial length h of the bolt0And the axial length h of the connector;
s50: according to the axial length h of the bolt0Determining the axial length h of the shear bolt (3)1Axial length h of the anti-pulling bolt rod (2)2And the axial length h of the elastic member (307)3。
8. The method for designing a movable self-resetting anti-pulling shear connector according to claim 7, wherein the breaking load Pu of the concrete in the step S10 is:
Pu＝fc1·A
wherein f isc1The concrete standard test piece compressive strength is as follows: n/mm2(ii) a A is the contact area of a concrete standard test piece in mm2(ii) a Pu is the breaking load of concrete, unit: n/mm2The unit: n/mm2。
The diameter d of the pin in the step S20s：
Wherein d issDiameter of the pin, unit: mm; a. thesIs the cross-sectional area of the bolt, in units: mm is2(ii) a Pi is a physical constant; ecIs the concrete elastic modulus, unit: n/mm2；fc2Is the concrete prism compressive strength, unit: n/mm2。
9. The design method of movable self-resetting anti-pulling shear connector as claimed in claim 8, wherein the radial outward extension length d of the nail cap (1) in S300：
Diameter d of the nail headh：
dh＝2d0+ds
Axial length t of the nail headh：
S0＝πd0(d0+ds)
Wherein d is0The radial overhanging length of the nail head is shown as unit: mm; dhDiameter of the nail head, unit: mm; t is thIs the axial length of the nail cap, unit: mm; s0Is the effective contact area of the nail cap overhanging part and the concrete, and the unit is: mm is2；fysIs the tensile strength of the pin, unit: n/mm2。
10. The method for designing a movable self-resetting anti-pulling shear connector according to claim 9, wherein the axial length h of the pin in S400：
Axial length h of the connector:
h＝h0+th
axial length h of shear bolt (3)1：
Axial length h of elastic member (307)3：
h3＝ds
Axial length h of anti-pulling bolt rod (2)2：
h2＝h0-h1-h3
Wherein h is0Is the axial length of the bolt rod, in units: mm; h is1Axial length of the shear bolt, unit: mm; h is2Is the axial length of the anti-pulling bolt rod (2), and the unit is as follows: mm; h is3Is the axial length of the elastic member (307) in units of: mm; f is the tensile strength of the concrete, unit: n/mm2。
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114294311A (en) * | 2021-12-30 | 2022-04-08 | 中南大学 | Anti-pulling flexible shear-resistant self-tapping screw |
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Application publication date: 20210910 |