CN217460961U - Weakening type flange connecting cover plate pressure-bearing device - Google Patents

Abstract

The utility model relates to a formula of weakening edge of a wing joint cover board pressure-bearing device, including a pair of H type non-yield girder steel on same horizontal plane, two H type non-yield girder steels splice, the web of H type non-yield girder steel is vertical, the upper and lower edge of a wing level of H type non-yield girder steel sets up, the outside of one of them H type non-yield girder steel is fixed on vertical steel sheet, on the H type non-yield girder steel, the concatenation department on the edge of a wing at lower both ends is fixed with dog bone formula edge of a wing connection cover board for the web symmetry respectively, the external fixation on dog bone formula edge of a wing connection cover board has edge connection cover board pressure-bearing unit, the front and back both sides difference symmetry of the web concatenation department of H type non-yield girder steel is fixed with web connection cover board. The utility model discloses the installation is simple, makes things convenient for the site operation, and the mechanism of action is clear and definite, can improve the deformation and the power consumption ability of node.

Description

A weakened flange connection cover plate pressure bearing device

technical field

The utility model belongs to a steel frame structure in the field of construction engineering, and relates to a weakened flange connection cover plate pressure bearing device.

Background technique

Earthquake is a common natural disaster, which poses a great threat to human life and property safety. With the increasing application of steel structures in buildings, the seismic performance of steel structures has been studied in depth, and more reasonable seismic methods have been proposed. also appears to be more important. Before the Beiling earthquake in 1994 and the Hanshin earthquake in 1995, the steel frame was always considered to be a structural form with good ductility and light weight. In terms of seismic performance, the main failure form is the brittle failure of the joint. The main reason is that the quality of the field weld is difficult to guarantee, and the stress at the joint of the beam-column joint is large, resulting in the overlapping of the joint interface and the plastic hinge area. For this reason, many innovative nodes have been proposed to avoid this problem, which are mainly divided into strengthened and weakened nodes.

In recent years, in order to better meet the goal of building more post-earthquake recoverable cities, a weakened joint with cantilever beam sections has become the main research on steel structure joints due to its advantages of easy to set weak links and replaceability. direction. This type of node first welds the column and cantilever steel beam section in the factory; when transported to the site for assembly, high-strength bolts and connecting cover plates are used to semi-rigidly connect the column with the cantilever beam section to the steel beam section, which not only ensures the quality of the welds In addition, the plastic hinge area is guided to occur in the weakened section, which realizes the advantage that only the connecting cover can be replaced after the earthquake and can be restored to use, and the building repair cost is effectively reduced. However, in further research, it was found that with the increase of the rotation angle and the number of cyclic loads, the connecting cover plate is prone to serious buckling under compression, which makes the bearing capacity of the joint drop rapidly, and the hysteresis curve shows a certain degree of stiffness, stiffness and buckling. The degradation of strength affects the seismic performance of the joint.

Utility model content

In view of this, the purpose of the present utility model is to provide a weakened flange connection cover plate pressure bearing device applied to a steel frame beam-column joint with a cantilever beam section, under the action of the reciprocating load, the object bearing the tensile and compressive load is effectively carried out. Separation, that is, when the node is bent, the dog-bone flange connection cover plate only bears the tensile force, and the pressure is borne by the flange connection cover plate bearing unit. With the increase of the number of times, serious buckling under compression occurs, which leads to a rapid decrease in the bearing capacity of the joint, and a certain degree of stiffness and strength degradation in the hysteresis curve, which affects the seismic performance of the joint.

To achieve the above object, the utility model provides the following technical solutions:

A weakened flange connection cover plate pressure bearing device, comprising a pair of H-shaped non-yield steel beams on the same horizontal plane, two H-shaped non-yield steel beams are spliced, and the web of the H-shaped non-yield steel beams is vertical , the upper and lower flanges of the H-type non-yield steel beam are set horizontally, and the outer side of one H-type non-yield steel beam is fixed on the vertical steel plate, and the flanges at the upper and lower ends of the H-type non-yield steel beam are spliced. There are dog-bone flange connection cover plates symmetrical with respect to the web respectively fixed at each point, the flange connection cover plate bearing unit is fixed on the outside of the dog-bone flange connection cover plate, and the web plate of the H-type non-yield steel beam is spliced The front and rear sides are respectively symmetrically fixed with web connecting cover plates.

Further, the high-strength bolts pass through the flange on the side away from the steel plate to connect the cover plate pressure-bearing unit, the dog-bone flange connection cover plate and the flange of the movable H-shaped non-yield steel beam, and then are fixed by bolts. 3. Pass through the flange near the steel plate side in turn to connect the cover plate pressure-bearing unit, the dog-bone flange connection cover plate and the flange of the fixed H-shaped non-yield steel beam, and then fix by bolts.

Further, the left and right ends of the dog-bone flange connection cover plate are arranged with dog-bone flange connection cover plate bolt holes and dog-bone flange connection cover plate oblong holes which are matched with high-strength bolts three and high-strength bolts respectively. , the left and right ends of the flange connection cover plate pressure unit are respectively arranged with the flange connection cover plate pressure unit bolt hole and the flange connection cover plate pressure unit oval hole matched with the high-strength bolt 3 and the high-strength bolt 1. , The oblong hole of the flange connection cover plate pressure-bearing unit and the oblong hole of the dog-bone flange connection cover plate are not completely overlapped, and the size of the overlapping part is the diameter of a high-strength bolt. The flanges of the steel beams are connected.

Further, the middle part of the dog-bone flange connecting cover plate is provided with symmetrical arc-shaped notches on both sides in the width direction.

Further, the dog-bone flange connection cover plate and the flange connection cover plate pressure-bearing unit have the same width and the same length, and the two overlap.

Further, the thickness of the flange connection cover plate pressure-bearing unit is slightly larger than the thickness of the dog-bone flange connection cover plate.

The beneficial effects of the present utility model are:

The weakened flange connection cover plate pressure bearing device effectively separates the objects bearing tensile and compressive loads, and realizes that the dog-bone flange connection cover plate is only subjected to tension but not compression during the bending process of the node, connecting the traditional node flanges. The pressure that the cover plate needs to bear is borne by the flange connecting cover plate device, which effectively avoids the serious buckling phenomenon of the connecting cover plate with the increase of the rotation angle and the number of cyclic loads of the weakened node with cantilever beam section. In this way, the bearing capacity of the joint is improved, the degradation of the stiffness and strength of the hysteretic curve is reduced, and the seismic performance of the joint is fully exerted.

The weakened flange connection cover plate pressure bearing device is easy to install, convenient for on-site construction operations, and has a clear mechanism of action, which can improve the deformation and energy dissipation capacity of nodes.

Other advantages, objects and features of the present invention will be set forth in the description that follows, and to the extent that will be apparent to those skilled in the art based on a study of the following, or may be Lessons are learned from the practice of the present invention. The objectives and other advantages of the present invention may be realized and attained by the following description.

Description of drawings

In order to make the purpose, technical solutions and advantages of the present utility model clearer, the present utility model will be described in detail below with reference to the accompanying drawings, wherein:

Fig. 1 is the structural representation of the utility model embodiment;

Fig. 2 is the exploded schematic diagram of the embodiment of the utility model;

3 is a front view of the installation of the embodiment of the utility model, the connecting bolts of the web are not drawn, and the oblong holes are shown in perspective;

4 is a schematic structural diagram of a flange connection cover plate pressure-bearing unit according to an embodiment of the present utility model;

5 is a schematic structural diagram of a dog-bone flange connection cover according to an embodiment of the present invention;

6 is a top view of the flange connection cover plate pressure-bearing device and the dog-bone flange connection cover plate stacked according to the embodiment of the present invention, which is illustrated in perspective.

Reference number:

1. H-type non-yielding steel beam; 2. Dog-bone flange connection cover plate; 3. Flange connection cover plate bearing unit; 4. Web plate connection cover plate; 5-1, High-strength bolt 1; 5-2 , High-strength bolt two; 5-3, high-strength bolt three; 6, dog-bone flange connection cover plate bolt hole; 7, dog-bone flange connection cover plate oblong hole; 8, flange connection cover plate pressure-bearing device bolts 9. The flange connects the oblong hole of the cover plate pressure-bearing device.

Detailed ways

The embodiments of the present invention are described below through specific specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments are only used to illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

Among them, the accompanying drawings are only used for exemplary description, and they are only schematic diagrams, not physical drawings, and should not be construed as restrictions on the present utility model; in order to better illustrate the embodiments of the present utility model, some parts of the accompanying drawings may have Omission, enlargement or reduction, do not represent the size of the actual product; it is understandable to those skilled in the art that some well-known structures and their descriptions in the accompanying drawings may be omitted.

The same or similar symbols in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms "upper", "lower", "left", " The orientation or positional relationship indicated by "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the indicated device. Or the elements must have a specific orientation, be constructed and operated in a specific orientation, so the terms describing the positional relationship in the accompanying drawings are only used for exemplary illustration, and should not be construed as a limitation to the present invention, for those of ordinary skill in the art. , the specific meanings of the above terms can be understood according to specific situations.

Please refer to Figures 1 to 6, which are a weakened flange connection cover plate pressure bearing device, comprising a pair of H-shaped non-yield steel beams 1 on the same horizontal plane, and two H-shaped non-yield steel beams 1 are spliced together. The web of the H-shaped non-yield steel beam 1 is vertical, the upper and lower flanges of the H-shaped non-yield steel beam 1 are arranged horizontally, and the outer side of one H-shaped non-yield steel beam 1 is fixed on a vertical steel plate. The splices of the flanges at the upper and lower ends of the H-shaped non-yield steel beam 1 are respectively fixed with dog-bone flange connection cover plates 2 symmetrical with respect to the web, and the dog-bone flange connection cover plate 2 is fixed outside The flange is connected to the cover plate bearing unit 3 . The web connection cover plates 4 are fixed symmetrically on the front and rear sides of the web splicing of the H-shaped non-yield steel beam 1 respectively.

The middle part of the dog-bone flange connection cover plate 2 is provided with symmetrical arc-shaped gaps on both sides in the width direction. The rigidity of the segment is avoided to prevent the screw hole connecting the cover plate from being damaged first when the corner is large.

The dog-bone flange connection cover plate 2 and the flange connection cover plate pressure-bearing unit 3 have the same width and the same length, and the two overlap.

High-strength bolts 1 5-1 pass through the flange on the side away from the steel plate to connect the cover plate pressure-bearing unit 3, the dog-bone flange to connect the cover plate 2 and the flange of the movable H-shaped non-yield steel beam 1, and then fix by bolts . High-strength bolts 3 5-3 pass through the flange near the steel plate side to connect the cover plate pressure-bearing unit 3, the dog-bone flange connection cover plate 2 and the flange of the fixed H-shaped non-yield steel beam 1, and then fix by bolts . The high-strength bolts 5-2 pass through the web connecting cover plate 4, the web of the H-shaped non-yield steel beam 1 and the web connecting cover plate 4 in turn, and then are fixed with nuts.

The thickness of the flange connection cover plate pressure unit 3 is slightly larger than the thickness of the dog-bone flange connection cover plate 2 . Because steel has good ductility under tension, it is prone to buckling instability under compression. Therefore, it is necessary to increase the thickness of the pressure-bearing object flange connecting cover plate pressure-bearing unit 3 to avoid the occurrence of buckling under pressure.

The left and right ends of the dog-bone flange connection cover plate 2 are respectively arranged with dog-bone flange connection cover plate bolt holes 6 and dog-bone wings, which are respectively matched with high-strength bolts 3 5-3 and high-strength bolts 5-1. The edge is connected to the oblong hole 7 of the cover plate. The left and right ends of the flange connection cover plate pressure unit 3 are respectively arranged with flange connection cover plate pressure unit bolt holes 8 and flange connections that are matched with high-strength bolts 3 5-3 and high-strength bolts 5-1. Cover plate pressure-bearing unit oblong hole 9. The arrangement position of the oblong hole 9 of the pressure-bearing unit of the flange connection cover plate and the oblong hole 7 of the dog-bone flange connection cover plate are not completely overlapped, and the size of the overlapping part is a high-strength bolt hole diameter, and the high-strength bolt 1 5-1 passes through the overlapping part Connect with the flange of H-shaped non-yield steel beam 1.

When the node flange is under pressure, the left semi-circular screw surface of the high-strength bolt 1 5-1 transmits force through the flange connection with the hole wall of the oblong hole 9 of the pressure-bearing unit of the cover plate, and connects with the dog-bone flange to the oblong hole 7 of the cover plate. There is a certain slip space between the hole walls and the angle of rotation is increased; when the node flange is tensioned, the right semicircular screw surface of the high-strength bolt 1 5-1 is connected to the oblong hole 7 of the cover plate through the dog-bone flange for transmission. There is a certain sliding space between the hole wall of the oblong hole 9 of the cover plate pressure-bearing unit connected with the flange, which can increase the turning angle, that is, when the flange is compressed, the flange is mainly connected to the cover plate pressure-bearing unit 3. , when the flange is in tension, the dog-bone flange connection cover plate 2 is mainly stressed, so as to realize the separation of the objects bearing the tensile and compressive load. The shear force of the beam section is borne by the web connection cover plate 4;

There is no filler material between the threaded rod of the high-strength bolt and the wall of the oblong hole.

The number of high-strength bolts required to connect the H-shaped non-yield steel beam 1 to the device meets the requirements for transmitting the shear force of the energy dissipation component.

The specific implementation of the present invention will be described below by taking a possible embodiment of the present invention as an example.

Device processing:

The H-shaped non-yield steel beam 1 was split into two sections at the factory and conventional columns with cantilever sections were machined. According to the flange width, flange thickness and web height and web thickness of H-type non-yielding steel beam 1, select and process the corresponding dog-bone flange connection cover plate 2, flange connection cover plate pressure unit 3, The web is connected to the cover plate 4 and the high-strength bolts.

Device installation:

The flange connection cover plate pressure unit 3 is aligned with the dog-bone flange connection cover plate 2, and the high-strength bolts 3 5-3 pass through the flange connection cover plate pressure unit bolt holes 8 in sequence, and the dog-bone flange connection The bolt holes 6 of the cover plate are connected with the H-type non-yield steel beam 1; the high-strength bolts 1 5-1 pass through the oblong hole 9 of the flange connection cover plate pressure-bearing unit and the oblong hole 7 of the dog-bone flange connection cover plate in sequence. The overlapping part is connected with the H-shaped non-yielding steel beam 1 . High-strength bolts 2 5-2 are connected to the H-shaped non-yielding steel beam 1 through the web connection cover plate 4 .

The utility model proposes a flange connection cover plate pressure-bearing device. The device staggers and arranges the oblong holes on the dog-bone flange connection cover plate 2 and the flange connection cover plate pressure-bearing unit 3, so as to achieve the object bearing tension and compression load. The purpose of separation is that when the node flange is in tension, it is mainly supported by the high-strength bolts connecting the cover plate 2 with the dog-bone flange, and the high-strength bolts connecting the flanges with the cover plate pressure unit 3 when under pressure. The compressive force effectively avoids the phenomenon that the flange connection cover plate is greatly buckled outside the plane due to the compression when the node rotation angle is too large.

The following is the specific force analysis process:

When the joint steel beam flange is under tension, the force can be divided into two stages: the first stage is when the joint angle is small, the force passes through the static friction contact surface of the high-strength bolt bolt head and the flange connecting cover plate pressure-bearing unit 3, and is transmitted to the The flange is connected to the cover plate pressure-bearing unit 3, and the high-strength bolt is friction type at this time; the second stage is when the joint angle is large, due to the weakened flange connecting the cover plate pressure-bearing unit wall of the oblong hole 9 and the screw of the high-strength bolt. There is a certain sliding space between them, so during the sliding process of the high-strength bolt in the oblong hole, a part of the force is generated by the friction force generated by the contact surface between the bolt head of the high-strength bolt and the flange connection cover pressure unit 3, and is transmitted to the flange connection cover In the plate pressure-bearing unit 3, another part of the force is transmitted to the dog-bone flange connection cover plate 2 by the contact surface of the high-strength bolt screw and the hole wall of the dog-bone flange connection cover plate oblong hole 7. The high-strength bolt is a pressure-bearing type .

When the joint steel beam flange is compressed, the force can be divided into two stages: the first stage is when the joint rotation angle is small, the force passes through the static friction contact surface of the high-strength bolt bolt head and the flange connection cover plate pressure-bearing unit 3, and is transmitted to the The flange is connected to the cover plate bearing unit 3, and the high-strength bolts are friction type; the second stage is when the joint angle is large, the high-strength bolts are in contact with the wall of the oblong hole 9 of the flange connection cover plate pressure-bearing unit after the oblong hole slips. , and transmit the force to the flange connection cover plate pressure-bearing unit 3, at this time, the high-strength bolts are of the pressure-bearing type. During the compression process, the dog-bone flange connection cover plate 2 is basically in a state of no stress.

Therefore, the device can effectively avoid the phenomenon of buckling of the dog-bone flange connection cover plate 2 when the node is bent. The dog-bone flange connects the thickness of the cover plate 2. The device can ensure the fullness of the hysteresis curve, improve the energy dissipation capacity and deformation capacity of the node, and better exert the seismic performance of the node.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should The technical solutions are modified or equivalently replaced without departing from the purpose and scope of the technical solutions, and they should all be included in the scope of the claims of the present invention.

Claims (6)

1. A weakened flange connection cover plate pressure bearing device, characterized in that: it comprises a pair of H-type non-yield steel beams (1) on the same horizontal plane, and two H-type non-yield steel beams (1) are spliced together , the web of the H-type non-yield steel beam (1) is vertical, the upper and lower flanges of the H-type non-yield steel beam (1) are set horizontally, and the outer side of one of the H-type non-yield steel beams (1) is fixed at the vertical On the straight steel plate, the splices of the flanges at the upper and lower ends of the H-shaped non-yielding steel beam (1) are respectively fixed with a dog-bone flange connection cover plate (2) symmetrical with respect to the web, and the dog-bone flange The flange connection cover plate (2) is fixed to the outside of the flange connection cover plate pressure-bearing unit (3), and the front and rear sides of the web joint of the H-shaped non-yield steel beam (1) are symmetrically fixed with web connection covers respectively. plate (4). 2. A weakened flange connection cover plate pressure-bearing device according to claim 1, characterized in that: high-strength bolts one (5-1) pass through the flange connection cover plate pressure-bearing unit on the side away from the steel plate in turn (3) The dog-bone flange connects the cover plate (2) and the flange of the movable H-shaped non-yielding steel beam (1) and then is fixed by bolts, and three high-strength bolts (5-3) pass through the side near the steel plate in turn. The flange is connected to the cover plate pressure unit (3), the dog-bone flange is connected to the cover plate (2) and the flange of the fixed H-shaped non-yield steel beam (1) is fixed by bolts. 3. A weakened flange connection cover plate pressure-bearing device according to claim 2, characterized in that: the left and right ends of the dog-bone flange connection cover plate (2) are arranged with three (5) high-strength bolts respectively. -3) The dog-bone flange connection cover plate bolt hole (6) matched with the high-strength bolt 1 (5-1) and the dog-bone flange connection cover plate oblong hole (7), the flange connection cover plate bears pressure The left and right ends of the unit (3) are respectively arranged with flange connection cover plate pressure-bearing unit bolt holes (8) and flanges matched with high-strength bolts (5-3) and high-strength bolts (5-1). The oblong hole (9) of the pressure-bearing unit of the connecting cover plate, the oblong hole (9) of the pressure-bearing unit of the flange connecting cover plate and the oblong hole (7) of the dog-bone flange connecting cover plate are not completely overlapped, and the overlapping part is one size. The hole diameter of the high-strength bolt, the high-strength bolt one (5-1) is connected with the flange of the H-shaped non-yield steel beam (1) through the overlapping part. 4. A weakened flange connecting cover plate pressure bearing device according to claim 1, characterized in that: the middle part of the dog-bone flange connecting cover plate (2) is provided with symmetrical two sides in the width direction. Arc notch. 5. A weakened flange connection cover plate pressure-bearing device according to claim 1, characterized in that: the dog-bone flange connection cover plate (2) and the flange connection cover plate pressure bearing unit (3) The width is the same, the length is the same, and the two overlap. 6. A weakened flange connection cover plate pressure-bearing device according to claim 5, characterized in that: the thickness of the flange connection cover plate pressure-bearing unit (3) is slightly larger than that of the dog-bone flange connection cover plate ( 2) thickness.

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