An energy dissipation beam-column joint

Abstract

The present invention discloses an energy dissipation type beam-column node, comprising a steel column and a steel beam, wherein the steel beam comprises an intermediate beam section and a short beam section for welding to the steel column, wherein a gap is provided between the intermediate beam section and the short beam section, wherein the web of the intermediate beam section and the web of the short beam section are connected via a rotational friction energy dissipation damper, and the flange plate of the intermediate beam section and the flange plate of the short beam section are connected via a connecting plate and / or a damper. The short beam section and the intermediate beam section are connected via the rotational friction energy dissipation damper. Under the action of a relatively small earthquake, the beam-column node does not rotate, and only elastic deformation occurs at the node. Under the action of a strong earthquake, the beam-column node rotates, and the friction interface of the rotational friction energy dissipation damper forms a rotational friction force, thereby dissipating the seismic energy, so that the main beam-column components in the beam-column node basically maintain elasticity, thereby improving the seismic performance under strong earthquakes and effectively reducing the damage to the beam-column node.

Description

Technical Field

[0001] The present invention relates to the field of earthquake resistance technology, and more particularly to an energy dissipation beam-column node. Background Art

[0002] Early earthquake-resistant engineering designs for traditional steel frame structures mostly followed the "strong nodes and weak components" seismic design concept, but this still could not prevent problems such as stress concentration and magnetic damage at the nodes during strong earthquakes. For example, in the Northridge and Kobe earthquakes in the 1990s, a large number of steel structure beam-column welded nodes suffered brittle failure.

[0003] In summary, how to improve the seismic performance of nodes and reduce the damage to nodes caused by strong earthquakes is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide an energy-dissipating beam-column node, in which a rotational friction energy-absorbing damper is provided between the middle beam section and the short beam section of the steel beam, which can generate rotational friction and dissipate seismic energy when the beam-column node rotates, thereby reducing the damage and destruction of the beam-column node caused by strong earthquakes.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] An energy dissipation beam-column node comprises a steel column and a steel beam, wherein the steel beam comprises an intermediate beam section and a short beam section for being welded to the steel column, a gap being provided between the intermediate beam section and the short beam section, the web of the intermediate beam section and the web of the short beam section being connected via a rotational friction energy dissipation damper, and the flange plate of the intermediate beam section and the flange plate of the short beam section being connected via a connecting plate and / or a damper.

[0007] Preferably, the rotational friction energy dissipation damper comprises a rotational friction hinge, two web connecting plates and two friction plates, wherein the web connecting plates and the friction plates are symmetrically arranged on both sides of the web of the middle beam section;

[0008] One end of the web connecting plate and the friction plate is connected to the web of the short beam section via high-strength bolts with preload, and the other end is connected to the web of the middle beam section via the rotary friction hinge;

[0009] The web of the middle beam section is provided with at least one row of waist-shaped holes parallel to the beam axis, and the web connecting plate is provided with circular holes corresponding to the waist-shaped holes one by one, and the high-strength bolts are sequentially passed through the circular holes of the web connecting plate on one side, the waist-shaped holes of the middle beam section, and the circular holes of the web connecting plate on the other side;

[0010] The short side dimension of the waist-shaped hole is larger than the screw diameter of the high-strength bolt by 2 mm, and the long side dimension of the waist-shaped hole is larger than the allowable sliding displacement of the high-strength bolt.

[0011] Preferably, the rotary friction hinge includes a pin shaft and a fastening nut threadedly engaged with the pin shaft, and the pin shaft passes through the web connecting plate, the friction plate and the web of the middle beam section.

[0012] Preferably, the high-strength bolts are evenly distributed along the length direction of the web of the short beam section, and the high-strength bolts are evenly distributed along the height direction of the web of the short beam section.

[0013] Preferably, the upper flange plate of the middle beam section and the upper flange plate of the short beam section are connected via the connecting plate, and the upper flange plate of the middle beam section and the connecting plate, and the upper flange plate of the short beam section and the connecting plate are all connected via high-strength bolts.

[0014] Preferably, the damper includes an annular damper, an X-shaped damper or a triangular damper.

[0015] Preferably, the lower flange plate of the short beam section is provided with a cantilever plate, and the damper is provided between the lower flange plate of the middle beam section and the cantilever plate.

[0016] Preferably, the connecting plate is provided below the lower flange plate of the short beam section and the lower flange plate of the middle beam section, and the damper is provided between the connecting plate and at least one of the lower flange plate of the short beam section and the lower flange plate of the middle beam section.

[0017] Preferably, the connecting plate is provided above the lower flange plate of the middle beam section, the lower flange plate of the middle beam section and the connecting plate are connected by high-strength bolts, and the damper is provided between the lower flange plate of the short beam section and the connecting plate.

[0018] The energy dissipation beam-column node provided by the present invention does not rotate under the action of a relatively small earthquake, and only elastic deformation occurs at the node; under the action of a strong earthquake, the beam-column node rotates, and the friction interface of the rotational friction energy dissipation damper forms a rotational friction force, thereby dissipating the seismic energy, so that the main beam-column components in the beam-column node basically maintain elasticity, thereby improving the seismic performance under strong earthquakes and effectively reducing the damage to the beam-column node.

[0019] At the same time, the flange plate of the middle beam section and the flange plate of the short beam section can be connected through a damper. During a strong earthquake, the damper cooperates with the rotational friction energy-absorbing damper to dissipate energy, further reducing the damage and destruction of the beam-column node under the action of a strong earthquake. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0021] Figure 1 This is a structural diagram of a specific embodiment 1 of the energy dissipation beam-column node provided by the present invention;

[0022] Figure 2 This is a structural diagram of a specific embodiment 2 of the energy dissipation beam-column node provided by the present invention;

[0023] Figure 3 This is a structural diagram of a specific embodiment 3 of the energy dissipation beam-column node provided by the present invention;

[0024] Figure 4 Schematic diagram of the assembly of the middle beam section, short beam section and rotational friction energy dissipation damper.

[0025] Figures 1-4 middle:

[0026] 1 is a steel column, 2 is a steel beam, 21 is an intermediate beam section, 22 is a short beam section, 3 is a rotational friction energy dissipation damper, 31 is a web connecting plate, 32 is a friction plate, 33 is a pin, 34 is a fastening nut, 4 is a damper, 5 is a connecting plate, 6 is a high-strength bolt, 7 is a cantilever plate, 8 is a stiffening rib, and 9 is a reinforcement plate. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] The core of the present invention is to provide an energy-dissipating beam-column node. A rotational friction energy-absorbing damper is provided between the middle beam section and the short beam section of the steel beam. When the beam-column node rotates, rotational friction force is generated and seismic energy is dissipated, thereby reducing the damage and destruction of the beam-column node caused by strong earthquakes.

[0029] Please refer to Figures 1-4 , Figure 1 This is a structural diagram of a specific embodiment 1 of the energy dissipation beam-column node provided by the present invention; Figure 2 This is a structural diagram of a specific embodiment 2 of the energy dissipation beam-column node provided by the present invention; Figure 3This is a structural diagram of a specific embodiment 3 of the energy dissipation beam-column node provided by the present invention; Figure 4 Schematic diagram of the assembly of the middle beam section, short beam section and rotational friction energy dissipation damper.

[0030] The energy dissipation beam-column node provided by the present invention includes a steel column 1 and a steel beam 2. The steel beam 2 includes an intermediate beam section 21 and a short beam section 22 for welding to the steel column 1. A gap is provided between the intermediate beam section 21 and the short beam section 22. The web of the intermediate beam section 21 and the web of the short beam section 22 are connected by a rotational friction energy dissipation damper 3. The flange plate of the intermediate beam section 21 and the flange plate of the short beam section 22 are connected by a connecting plate 5 and / or a damper 4.

[0031] Please refer to Figure 1-Figure 3 The short beam section 22 is welded to the flange of the steel column 1. In order to enhance the strength of the beam-column node, preferably, the web of the steel column 1 is welded with a stiffening rib 8 that is flush with the flange plate of the short beam section 22.

[0032] The middle beam section 21 and the short beam sections 22 on either side together form the steel beam 2. The length of the middle beam section 21, the length of the short beam sections 22, and the width of the gap between the middle beam section 21 and the short beam sections 22 are calculated and determined based on the design strength of the beam-column joint in actual construction. In a specific embodiment, the width of the gap between the middle beam section 21 and the short beam sections 22 is set to 30 mm.

[0033] During a strong earthquake, the beam-column joint rotates, causing the short beam section 22 welded to the steel column 1 and the intermediate beam section 21 to rotate relative to each other. This causes the rotational friction damper 3 connecting the webs of the two to generate rotational friction, dissipating seismic energy. The type and size of the rotational friction damper 3, as well as the connection method between the rotational friction damper 3 and the steel beam 2, are determined according to actual construction needs and will not be detailed here.

[0034] In order to enhance the connection strength between the middle beam section 21 and the short beam section 22 , a connecting plate 5 and / or a damper 4 are provided between the flange plate of the middle beam section 21 and the flange plate of the short beam section 22 .

[0035] The arrangement and location of the connecting plate 5 and the damper 4 are not limited. The connecting plate 5 may span the flange plate of the middle beam section 21 and the flange plate of the short beam section 22, and be connected to the flange plate of the middle beam section 21 and the flange plate of the short beam section 22 respectively by high-strength bolts 6, such as Figure 1 As shown; the connecting plate 5 may also be in contact with and connected to one of the flange plates of the intermediate beam section 21 and the flange plates of the short beam section 22, and connected to the other through a damper 4 or an I-beam, a steel pipe or other connecting member, such as Figure 3 As shown; it can also be a connecting plate 5 parallel to the flange plate of the intermediate beam section 21, the flange plate of the short beam section 22 is set, and both ends of the connecting plate 5 are connected by a damper 4 or an I-beam, a steel pipe or other connecting member, such as Figure 2 shown.

[0036] In addition to enhancing the connection strength, the damper 4 can cooperate with the rotational friction energy dissipation damper 3 to dissipate seismic energy, further reducing the damage to the beam-column node during an earthquake.

[0037] The damper 4 may include an annular damper, an X-shaped damper or a triangular damper, etc. The specific type, size and quantity of the damper 4 are determined according to the design shock absorption requirements of the actual construction, and will not be repeated here.

[0038] In this embodiment, the short beam section 22 and the middle beam section 21 welded to the steel column 1 are connected by a rotational friction energy dissipation damper 3. Under the action of a smaller earthquake, the beam-column node does not rotate, and only elastic deformation occurs at the node; under the action of a strong earthquake, the beam-column node rotates, and the friction interface of the rotational friction energy dissipation damper 3 forms a rotational friction force, thereby dissipating the seismic energy, so that the main beam-column components in the beam-column node basically maintain elasticity, thereby improving the seismic performance under strong earthquakes and effectively reducing the damage to the beam-column node.

[0039] At the same time, the flange plate of the middle beam section 21 and the flange plate of the short beam section 22 can be connected through the damper 4. During a strong earthquake, the damper 4 cooperates with the rotational friction energy-absorbing damper 3 to jointly consume energy, further reducing the damage and destruction of the beam-column node under the action of a strong earthquake.

[0040] Preferably, please refer to Figure 1-Figure 3 The upper flange plate of the middle beam section 21 and the upper flange plate of the short beam section 22 are connected by a connecting plate 5. The upper flange plate and the connecting plate 5 of the middle beam section 21 and the upper flange plate and the connecting plate 5 of the short beam section 22 are all connected by high-strength bolts 6 to enhance the connection strength between the middle beam section 21 and the short beam section 22.

[0041] Based on the above embodiment, the structure of the rotational friction energy dissipation damper 3 is defined. Please refer to Figure 4 The rotational friction energy dissipation damper 3 includes a rotational friction hinge, two web connecting plates 31 and two friction plates 32. The web connecting plates 31 and the friction plates 32 are symmetrically arranged on both sides of the web of the middle beam section 21; one end of the web connecting plate 31 and the friction plate 32 is connected to the web of the short beam section 22 by a high-strength bolt 6 with preload, and the other end is connected to the web of the middle beam section 21 by a rotational friction hinge; the web of the middle beam section 21 is provided with at least one row of waist-shaped holes parallel to the beam axis, and the web connecting plate 31 is provided with circular holes corresponding to the waist-shaped holes one by one. The high-strength bolts 6 pass through the circular holes of the web connecting plate 31, the waist-shaped holes of the web of the middle beam section 21 and the circular holes of the web connecting plate 31 on the other side in sequence; the short side dimension of the waist-shaped hole is larger than the bolt diameter of the high-strength bolt 6 by 2 mm, and the long side dimension of the waist-shaped hole is larger than the allowable sliding displacement of the high-strength bolt 6.

[0042] It should be noted that the beam axis here refers to the axis of the web of the middle beam section 21, that is, the axis of the steel beam 2.

[0043] Among them, the web connecting plate 31 is used to connect the web of the middle beam section 21 and the web of the short beam section 22. The length of the web connecting plate 31 is determined according to factors such as the gap width between the middle beam section 21 and the short beam section 22, the size of the rotating friction hinge, and the size and number of the high-strength bolts 6.

[0044] The friction plate 32 is used to generate rotational friction during rotation and hinder the relative rotation of the middle beam section 21 and the short beam section 22 to dissipate seismic energy. The type, shape, size and setting position of the friction plate 32 are determined according to actual construction needs and will not be repeated here.

[0045] The rotating friction hinge provides a rotation axis for the short beam section 22 to rotate relative to the middle beam section 21. Figure 4 The rotary friction hinge includes a pin 33 and a fastening nut 34 threadedly matched with the pin 33. The pin 33 passes through the web connecting plate 31, the friction plate 32 and the web of the middle beam section 21.

[0046] The material and size of the pin 33 are determined based on the design strength calculation of the rotary friction hinge to prevent the pin 33 from being broken due to excessive torsional stress during a strong earthquake; the size of the fastening nut 34 is determined based on the size of the pin 33.

[0047] The high-strength bolts 6 are used to connect the web connecting plate 31 and the web of the short beam section 22, and bear the shear load when the shear force at the beam end is too large. Their specific size, quantity, distribution and preload value need to be calculated and determined based on the design connection strength of the rotational friction dissipation damper 3 and the short beam section 22.

[0048] In order to meet the requirements of the high-strength bolts 6 rotating and bearing shear loads, the bolt connection holes of the web of the middle beam section 21 are set as waist-shaped holes.

[0049] Preferably, high-strength bolts 6 can be evenly distributed along the length direction of the web of the short beam section 22, and high-strength bolts 6 can be evenly distributed along the height direction of the web of the short beam section 22, so that each point of the short beam section 22 is subjected to relatively uniform force.

[0050] In this embodiment, one end of the rotational friction energy dissipation damper 3 is rotationally connected to the middle beam section 21 through a rotational friction hinge, and the other end is fixedly connected to the short beam section 22 through a high-strength bolt 6. During a strong earthquake, the short beam section 22 rotates relative to the middle beam section 21 through the rotational friction hinge. At the same time, the relative rotation of the two causes rotational friction to be generated between the friction plate 32 and the web connecting plate 31 and the web of the middle beam section 21, thereby dissipating the vibration energy.

[0051] In a specific embodiment of the present invention, please refer to Figure 1 The lower flange plate of the short beam section 22 is provided with a cantilever plate 7, and a damper 4 is provided between the lower flange plate of the middle beam section 21 and the cantilever plate 7.

[0052] Preferably, a reinforcing plate 9 is provided between the web of the short beam section 22 and the cantilever plate 7. The web of the short beam section 22 and the reinforcing plate 9, and the reinforcing plate 9 and the cantilever plate 7 are all welded to enhance the connection strength between the cantilever plate 7 and the short beam section 22.

[0053] The shape, size and connection position of the reinforcing plate 9 are determined according to factors such as the size of the short beam section 22 in actual construction and the length of the cantilever plate 7 extending out of the short beam section 22.

[0054] In another embodiment of the present invention, please refer to Figure 2 A connecting plate 5 is provided below the lower flange plate of the short beam section 22 and the lower flange plate of the middle beam section 21, and a damper 4 is provided between the connecting plate 5 and at least one of the lower flange plate of the short beam section 22 and the lower flange plate of the middle beam section 21.

[0055] The damper 4 is fixedly connected to the lower flange plate and the connecting plate 5 by high-strength bolts 6. In addition, the damper 4 can also be replaced by connecting parts such as I-beams and steel pipes.

[0056] In another embodiment of the present invention, please refer to Figure 3 A connecting plate 5 is provided above the lower flange plate of the middle beam section 21. The lower flange plate of the middle beam section 21 and the connecting plate 5 are connected by high-strength bolts 6. A damper 4 is provided between the lower flange plate of the short beam section 22 and the connecting plate 5.

[0057] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0058] The above is a detailed introduction to the energy dissipation beam-column joint provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. An energy dissipation beam-column joint, comprising a steel column (1) and a steel beam (2), characterized in that: The steel beam (2) comprises an intermediate beam section (21) and a short beam section (22) for being welded to the steel column (1); the web of the steel column (1) is welded with a stiffening rib (8) flush with the flange plate of the short beam section (22); a gap is provided between the intermediate beam section (21) and the short beam section (22); the web of the intermediate beam section (21) and the web of the short beam section (22) are connected via a rotational friction energy dissipation damper (3); the flange plate of the intermediate beam section (21) and the flange plate of the short beam section (22) are connected via a connecting plate (5) and / or a damper (4); the damper (4) comprises an annular damper, an X-shaped damper or a triangular damper; The upper flange plate of the middle beam section (21) and the upper flange plate of the short beam section (22) are connected via the connecting plate (5), and the upper flange plate of the middle beam section (21) and the connecting plate (5), as well as the upper flange plate of the short beam section (22) and the connecting plate (5) are all connected via high-strength bolts (6); The lower flange plate of the short beam section (22) is provided with a cantilever plate (7), and the damper (4) is provided between the lower flange plate of the middle beam section (21) and the cantilever plate (7); Alternatively, the connecting plate (5) is provided below both the lower flange plate of the short beam section (22) and the lower flange plate of the middle beam section (21), and the damper (4) is provided between at least one of the lower flange plate of the short beam section (22) and the lower flange plate of the middle beam section (21) and the connecting plate (5); Alternatively, the connecting plate (5) is provided above the lower flange plate of the middle beam section (21), the lower flange plate of the middle beam section (21) and the connecting plate (5) are connected via high-strength bolts (6), and the damper (4) is provided between the lower flange plate of the short beam section (22) and the connecting plate (5); The rotational friction energy dissipation damper (3) comprises a rotational friction hinge, two web connecting plates (31) and two friction plates (32), wherein the web connecting plates (31) and the friction plates (32) are symmetrically arranged on both sides of the web of the middle beam section (21); One end of the web connecting plate (31) and the friction plate (32) are connected to the web of the short beam section (22) via a high-strength bolt (6) with preload, and the other end is connected to the web of the middle beam section (21) via the rotary friction hinge; The web of the short beam section (22) is provided with at least one row of waist-shaped holes parallel to the beam axis, the web connecting plate (31) is provided with circular holes corresponding to the waist-shaped holes one by one, the high-strength bolts (6) pass through the circular holes of the web connecting plate (31) on one side, the waist-shaped holes of the short beam section (22), and the circular holes of the web connecting plate (31) on the other side in sequence, and the high-strength bolts (6) are used to bear shear loads; The short side dimension of the waist-shaped hole is larger than the screw diameter of the high-strength bolt (6) by 2 mm, and the long side dimension of the waist-shaped hole is larger than the allowable sliding displacement of the high-strength bolt (6).

2. The energy dissipation beam-column node according to claim 1, characterized in that: The rotary friction hinge includes a pin shaft (33) and a fastening nut (34) threadedly matched with the pin shaft (33); the pin shaft (33) passes through the web connecting plate (31), the friction plate (32) and the web of the middle beam section (21).

3. The energy dissipation beam-column joint according to claim 1, characterized in that: The high-strength bolts (6) are evenly distributed along the length direction of the web of the short beam section (22), and the high-strength bolts (6) are evenly distributed along the height direction of the web of the short beam section (22).

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