Energy consumption type beam column rigid connection joint and energy consumption type beam column structure system

Abstract

The invention relates to an energy consumption type beam column rigid connection joint and an energy consumption type beam column structure system. The rigid connection joint comprises a column side fixing piece, at least two column side first connecting plates are welded and fixed to a column body, corresponding to one side of a steel beam, of a frame column, and a column side second connecting plate is welded and fixed to a column body, corresponding to one side of the steel beam, of the frame column; the beam end plate is welded and fixed to the beam end, corresponding to one side of the frame column, of the steel beam, at least two sets of beam end first connecting plates are welded and fixed to the beam end plate, and the beam end second connecting plate is welded and fixed to the beam end plate, located between the two sets of beam end first connecting plates and corresponding to the column side second connecting plate; the at least two groups of variable stiffness connecting rods are respectively connected with the column side first connecting plate and the beam end first connecting plate, and the pin shaft is connected with the column side second connecting plate and the beam end second connecting plate. The energy consumption type beam column rigid connection joint and the energy consumption type beam column structure system have enough energy consumption capacity, the position of the plastic hinge is controllable, the plastic hinge is easy to replace after a strong earthquake, and the energy consumption type beam column rigid connection joint and the energy consumption type beam column structure system can be widely applied to multi-story and high-rise steel structure buildings.

Description

Technical Field

[0001] The invention relates to the technical field of building structure design, in particular to a structural connection node, specifically an energy-absorbing beam-column rigid connection node and an energy-absorbing beam-column structural system. Background Art

[0002] In the design of multi-story steel structures, the reasonable design of nodes is an important part of ensuring structural safety. Although steel is a homogeneous material with high strength and good ductility, steel structure components are prone to buckling, instability and brittle failure, and the instability and brittle failure of components almost always occur in the beam-column connection node area. Unreasonable node design will not only cause brittle failure of the node, but also cause a large amount of steel to be used, which artificially causes the cost of steel structure to be high, which has seriously restricted the development of high-rise steel structures. Statistics show that in previous earthquake disasters, more than 70% of steel structure damage occurred at node connections.

[0003] The deformation performance of steel structures mainly depends on the connection, design, construction and production of nodes, among which the design plays a decisive role. The design principle of steel structure nodes is "strong nodes and weak components", that is, to ensure that the plastic hinge area appears before the node area at the beam end under strong earthquakes, and at the same time, the plastic hinge area should have a certain rotation ability to dissipate as much seismic energy as possible. In fact, in actual structures now, although some structural measures have been taken to meet the "strong nodes and weak components", the effect is not ideal. The plastic energy dissipation capacity of steel beams is limited, and it is difficult to repair after a strong earthquake.

[0004] Plastic hinges appear on beams near the column surface, which may cause large thickness-direction strains in the material of the column flange and place high plastic deformation requirements on the weld metal and the heat-affected zone around it. These situations may also lead to brittle failure. Therefore, in order to achieve reliable performance, it is better to connect the beam and column in the structure so that the plastic hinge moves outward. There are two ways to move the plastic position outward from the column surface. One is to locally weaken the beam section at a certain distance from the column surface (weakened node), and the other is to locally strengthen the node part (strengthened node). The typical length of the plastic hinge in a steel beam is about half the height of the beam. When the node is locally strengthened, the plastic hinge position can be taken as 1 / 3 of the height of the beam at the edge of the strengthened part. Although local strengthening of the node can also move the plastic hinge outward, it should be very careful not to cause a weak column, which is contrary to the principle of strong column and weak beam. This form can achieve the purpose of transferring the plastic hinge, but when the plastic hinge is formed, it will cause a rapid decrease in the bearing capacity of the node. In addition, the energy dissipation capacity of this type of node is also very limited. The plastic zone often cannot be controlled in the weakened zone, and the node is very difficult to repair after an earthquake.

[0005] In general, at present, there are mainly weakened nodes and strengthened nodes. Although they can achieve the purpose of transferring plastic hinges, they have the following shortcomings:

[0006] 1) Once a plastic hinge is formed, it will cause a rapid decrease in the node bearing capacity.

[0007] 2) The energy dissipation capacity of the node is very limited, and the plastic zone often cannot be controlled within the weakened zone.

[0008] 3) It is very difficult to repair nodes after an earthquake. Summary of the invention

[0009] In view of the deficiencies in the prior art, the present invention provides an energy-absorbing beam-column rigid connection node and an energy-absorbing beam-column structural system, which not only has sufficient energy absorption capacity, but also has controllable yield energy absorption capacity and controllable plastic hinge position. It is also easy to replace after a strong earthquake and can be widely used in multi-story steel structure buildings.

[0010] The technical solution of the present invention is as follows:

[0011] The present invention first provides an energy-absorbing beam-column rigid connection node, which comprises:

[0012] A column side fixing member, the column side fixing member comprises a first column side connecting plate and a second column side connecting plate, at least two groups of the first column side connecting plates are welded and fixed to the column body on one side of the frame column corresponding to the steel beam, and are arranged at intervals up and down, the second column side connecting plate is welded and fixed to the column body on one side of the frame column corresponding to the steel beam, and is located between the two groups of the first column side connecting plates;

[0013] A beam end fixing member, the beam end fixing member comprises a beam end plate, a first beam end connecting plate and a second beam end connecting plate, wherein the beam end plate is welded and fixed to the beam end of the steel beam on one side of the frame column corresponding to the beam, at least two groups of the first beam end connecting plates are welded and fixed to the beam end plate and correspond to at least two groups of the first column side connecting plates, the second beam end connecting plate is welded and fixed to the beam end plate and is located between the two groups of the first beam end connecting plates and corresponds to the second column side connecting plate;

[0014] A connecting member, the connecting member includes a variable stiffness connecting rod and a pin, at least two groups of the variable stiffness connecting rods respectively connect the first connecting plate on the column side and the first connecting plate on the beam end, and the pin connects the second connecting plate on the column side and the second connecting plate on the beam end.

[0015] According to a preferred embodiment of the present invention, the node is just connected:

[0016] When the frame column is a concrete column, a column side embedded steel plate is embedded in the column body on the corresponding side of the steel beam, and the first column side connecting plate and the second column side connecting plate are both welded and fixed to the column side embedded steel plate;

[0017] When the frame column is a steel column, the first column-side connecting plate and the second column-side connecting plate are both welded and fixed to the steel column.

[0018] According to a preferred embodiment of the present invention, the node is just connected:

[0019] The back of the pre-embedded steel plate on the column side is anchored in the concrete column through anchor bars.

[0020] According to a preferred embodiment of the present invention, the node is just connected:

[0021] The second connecting plate on the column side and the second connecting plate at the beam end both adopt ear plates, and the ear plates are strongly welded to the frame columns, steel beams, etc.

[0022] According to a preferred embodiment of the present invention, the node is just connected:

[0023] The cross-sectional strength of the ear plate shall not be less than 1.3 times the strength of the web of the steel beam, and the shear bearing capacity of the pin shall not be less than 1.2 times the shear bearing capacity of the ear plate.

[0024] According to a preferred embodiment of the present invention, the node is just connected:

[0025] The variable stiffness connecting rod is fixed to the first connecting plate on the column side and the first connecting plate on the beam end by bolt connection.

[0026] According to a preferred embodiment of the present invention, the node is just connected:

[0027] The variable stiffness connecting rod is made of low yield point steel so as to yield before the end of the steel beam.

[0028] According to a preferred embodiment of the present invention, the node is just connected:

[0029] The variable stiffness link adopts a BRB support or a small viscous damper.

[0030] According to a preferred embodiment of the present invention, the node is just connected:

[0031] The plane size of the beam end plate is larger than the cross-sectional size of the steel beam, and a stiffening plate is welded and connected between the back of the beam end plate and the steel beam, and the stiffening plates are symmetrically arranged at the top and bottom of the steel beam.

[0032] The present invention also provides an energy-absorbing beam-column structural system, comprising a frame column and a steel beam, wherein the frame column and the steel beam are connected via the rigid connection node.

[0033] Beneficial effects: The energy-absorbing beam-column rigid joint and energy-absorbing beam-column structural system proposed in the present invention can achieve at least the following beneficial effects:

[0034] (1) The energy-absorbing beam-column rigid connection node provided by the present invention is different from the yield mechanism of the end of the steel beam in the traditional node. By adopting a connecting rod rigid connection combined with a pin hinge connection, under the action of an earthquake, there are bending moments and shear forces at the ends of the beams. The bending moments are borne by the upper and lower connecting rods, and the shear forces are borne by the pins. Under the action of the bending moments, the upper and lower connecting rods will produce tensile and compressive deformation energy consumption, thereby dissipating the earthquake energy.

[0035] (2) The present invention provides an energy-absorbing beam-column rigid joint, which has controllable yield energy absorption capacity, strong deformation capacity, strong energy absorption capacity, and controllable bearing capacity, thereby ensuring the safety and reliability of the overall structure. The yield energy absorption capacity of the traditional beam-column connection node is determined by the steel beam itself, and the energy absorption hysteresis curve is determined by the steel material of the steel beam. The present invention adopts a variable stiffness connecting rod, and the yield energy absorption capacity is controlled by the connecting rod. The connecting rod can be a BRB support or a small viscous damper, etc. Its energy absorption capacity is determined by the energy absorption capacity of the BRB or the viscous damper, so that the yield energy absorption capacity can be controlled.

[0036] (3) The energy-dissipating beam-column rigid joint provided by the present invention is different from the yield mechanism of the end of the steel beam in the traditional node. The position of the plastic hinge of the rigid joint is controllable. The position of the plastic hinge is at the position where the connecting rod yields. The calculation can be simplified by the middle position of the connecting rod. The yield time and energy dissipation capacity of the plastic hinge can be controlled by setting or adjusting the strength and stiffness of the connecting rod, so that the position of the plastic hinge can be controlled.

[0037] (4) The energy-absorbing beam-column rigid joint provided by the present invention can reduce earthquake secondary disasters, quickly restore building functions, and is basically unaffected. The node repair after the earthquake is simple and convenient, and has strong operability. The energy-absorbing component of the present invention is a connecting rod unit. Under the action of an earthquake, the connecting rod unit yields or dissipates energy in other forms. Only the connecting rod unit is damaged. After the earthquake, the connecting rod unit can be directly replaced. Due to the presence of the pin, other temporary supports are generally not required during replacement.

[0038] (5) The energy-absorbing beam-column rigid joint provided by the present invention has a simple structure, fast construction speed and saves construction time.

[0039] It should be understood that the implementation of any embodiment of the present invention does not mean that multiple or all of the above-mentioned beneficial effects must be possessed or achieved at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0041] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment in size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0042] Figure 1 A schematic diagram showing the assembly state of a rigid joint according to an embodiment of the present invention (concrete column);

[0043] Figure 2 Exemplary illustration Figure 1 Schematic diagram of the middle rigid joint before assembly (concrete column);

[0044] Figure 3 Exemplary illustration Figure 1 Schematic diagram of the embedded parts of the column shaft, where (a) is the main view and (b) is the side view;

[0045] Figure 4 A schematic diagram of a rigid connection node (steel column) according to another embodiment of the present invention is exemplified.

[0046] Markings in the figure:

[0047] Rigid joint 100, frame column 200, steel beam 300;

[0048] Column side fixing part 1, column body embedded part 11, column side first connecting plate 12, column side second connecting plate 13;

[0049] Beam end fixing member 2, beam end plate 21, beam end first connecting plate 22, beam end second connecting plate 23, stiffening plate 24;

[0050] Connecting piece 3, variable stiffness connecting rod 31, and pin 32.

[0051] The same or corresponding symbols in the drawings indicate the same or corresponding parts. DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solution and advantages of the embodiments of the present invention more clearly understood, the embodiments of the present invention are further described in detail below in conjunction with the embodiments and drawings. Here, the illustrative embodiments of the present invention and their description are used to explain the present invention, but are not intended to limit the present invention.

[0053] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] It should be understood that the terms "include / comprise", "consist of..." or any other variations are intended to cover non-exclusive inclusion, so that a product, device, process or method that includes a series of elements includes not only those elements, but also may include other elements not explicitly listed when necessary, or also includes elements inherent to such product, device, process or method. In the absence of more restrictions, the elements defined by the sentence "include / comprise...", "consist of..." do not exclude the presence of other identical elements in the product, device, process or method that includes the elements.

[0055] It is also necessary to understand that terms such as "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" to indicate directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device, component or structure must have a specific direction, be constructed or operate in a specific direction, and should not be understood as a limitation on the present invention.

[0056] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0057] In view of the current shortcomings of both weakened nodes and strengthened nodes, such as insufficient node bearing capacity, limited node energy dissipation capacity and difficulty in post-earthquake repair, the present invention provides an energy-absorbing beam-column rigid connection node and an energy-absorbing beam-column structural system to solve the corresponding problems and meet the needs of multi-story and high-rise steel structure building structures.

[0058] The implementation of the present invention is described in detail below in conjunction with preferred embodiments.

[0059] like Figure 1-4 As shown, Figure 1 A schematic diagram showing the assembly state of a rigid joint according to an embodiment (concrete column); Figure 2 Show Figure 1 Schematic diagram of the middle rigid joint before assembly (concrete column); Figure 3 Show Figure 1 Schematic diagram of embedded parts of column shaft; Figure 4 A schematic diagram of a rigid connection node (steel column) of another embodiment is shown.

[0060] Referring to 1-3, taking a concrete column as an example, an energy-absorbing beam-column rigid connection node 100 is first shown, connecting the frame columns 200 and the steel beams 300 on both sides. The rigid connection node 100 is mainly composed of a column side fixing member 1, a beam end fixing member 2 and a connecting member 3, and the connecting member 3 connects the column side fixing member 1 and the beam end fixing member 2 on both sides, thereby realizing the assembled connection and fixing of the beam and column, and meeting the requirements of bearing capacity, energy dissipation and post-earthquake repair.

[0061] Specifically, as the name implies, the column side fixing member 1 is set on the frame column 200 and connected and fixed to the frame column 200. The column side fixing member 1 first includes a column side first connecting plate 12. The column side first connecting plates 12 are set in at least two groups in height. The two groups of column side first connecting plates 12 are welded and fixed to the column body on one side of the frame column 200 corresponding to the steel beam 300, and are arranged at intervals up and down. The positions of the upper and lower intervals correspond to the upper and lower edges of the steel beam, or are more upward and downward relative to the upper and lower edges of the steel beam, so as to facilitate docking with the steel beam. In addition, there are generally no less than two groups of column side first connecting plates 12 on the plane, which are arranged symmetrically to ensure the overall stability of the support.

[0062] The column-side fixing member 1 also includes a column-side second connecting plate 13, which is arranged in a group in height, and is arranged between two groups of column-side first connecting plates 12. Similar to the column-side first connecting plates 12, the column-side second connecting plates 13 are welded and fixed to the column body on one side of the frame column 200 corresponding to the steel beam 300. In addition, there are generally no less than two groups of column-side second connecting plates 13 on the plane, which are arranged symmetrically to ensure the overall stability of the support.

[0063] It should be noted that the shape and size of the first column-side connecting plate 12 are determined according to design requirements. The cross-section shown in the figure is rectangular, and it can be a square block, a strip plate, etc., as long as it is suitable for connecting a variable stiffness connecting rod.

[0064] The shape and size of the second column-side connecting plate 13 are determined according to design requirements, but the second column-side connecting plate 13 should extend toward one side of the steel beam to facilitate the connection of the pin shaft.

[0065] In addition, in the case where the frame column 200 is a concrete column, in order to facilitate the fixing of the first connecting plate 12 and the second connecting plate 13 on the column side, a column body embedded part 11 is embedded in the column body on the side of the corresponding steel beam 300. The column body embedded part 11 is preferably, for example, a square or rectangular steel plate. The steel plate is embedded in the column body when the concrete column is manufactured, and the outer surface is flush with the surface of the column body. A plurality of anchor bars are welded and connected to the back side of the steel plate (the inward side). The plurality of anchor bars can be tied and connected to the main bars of the concrete column and are firmly embedded in the column body with the help of the plurality of anchor bars. The first connecting plate 12 and the second connecting plate 13 on the column side are both welded and fixed to the steel plate (the outward side).

[0066] Continue to see Figure 1-2 As the name implies, the beam end fixing member 2 is arranged at one end of the steel beam 300 and is connected and fixed to the steel beam 300. The beam end fixing member 2 first includes a beam end plate 21. The beam end plate 21 adopts a square or rectangular steel plate and is welded and fixed to the end of the steel beam 300. The beam end plate 21 is mainly used to set the first beam end connecting plate 22 and the second beam end connecting plate 23.

[0067] The beam end fixing member 2 also includes a first beam end connecting plate 22, which corresponds to the first column side connecting plate 12, and is arranged in at least two groups in height. The at least two groups of first beam end connecting plates 22 are welded and fixed to the beam end plate 21, and correspond to the positions of the at least two groups of column side first connecting plates 12. The first beam end connecting plate 22 can adopt the same structural form as the first column side connecting plate 12.

[0068] The beam end fixing member 2 also includes a second beam end connecting plate 23, which is arranged in a group and is located between two groups of first beam end connecting plates 22, corresponding to the position of the column side second connecting plate 13. The beam end second connecting plate 23 can adopt the same structural form as the column side second connecting plate 13.

[0069] See also Figure 1-2 The rigid joint 100 of the present invention is provided with a connecting member 3 for connecting the column side fixing members 1 and the beam end fixing members 2 on both sides.

[0070] The connecting member 3 first includes a variable stiffness connecting rod 31, of which at least two groups are provided, with bolt holes at both ends, which correspond one-to-one with two groups of column-side first connecting plates 12 and two groups of beam-end first connecting plates 22, and are fixed by high-strength bolts.

[0071] There are two groups of variable stiffness connecting rods, which work together through the upper and lower variable stiffness connecting rods to resist the bending moment at the end of the steel beam. Under the reciprocating action of the earthquake, the variable stiffness connecting rod yields and dissipates energy, thereby reducing the seismic damage to the structure and ensuring the safety of the overall structure. After the earthquake, it is very convenient to replace the variable stiffness connecting rod. In order to ensure that the variable stiffness connecting rod yields before the end of the steel beam under the action of the earthquake, the variable stiffness connecting rod should be made of low yield point steel, and the cross section is determined according to calculations. Generally, buckling restraint supports, viscous dampers, etc. can be used. The specific specifications need to be determined comprehensively according to the earthquake intensity and the required dissipation of earthquake energy.

[0072] The connecting member 3 also includes a pin 32. The free ends of the second connecting plate 13 on the column side and the second connecting plate 23 on the beam end are preset with pin holes. The pin 32 passes through the pin holes to connect the second connecting plate 13 on the column side and the second connecting plate 23 on the beam end.

[0073] In a preferred embodiment, the second connecting plate 13 on the column side and the second connecting plate 23 on the beam end are both in the form of ear plates, one end of the ear plate on the column side is welded and fixed to the steel column 200 (or the column body embedded part 11), and the other end is preset with a pin hole, and one end of the ear plate on the beam end is welded and fixed to the steel beam 300 (beam end plate 21), and the other end is preset with a pin hole, and the two ear plates are connected by a pin 32.

[0074] The ear plate on the column side is connected to the ear plate at the beam end through a pin to bear the shear force at the end of the steel beam. The cross-sectional strength of the ear plate is generally not less than 1.3 times the strength of the steel beam web, and the shear bearing capacity of the pin is not less than 1.2 times the shear bearing capacity of the ear plate.

[0075] By using the connecting rod to connect rigidly and the ear plate pin to connect hingedly, under the action of earthquake, there are bending moments and shear forces at the ends of the beams. The shear force is borne by the ear plate pin, and the bending moment is borne by the upper and lower connecting rods. Under the action of bending moment, the upper and lower connecting rods will produce tensile and compressive deformation energy consumption, thereby dissipating seismic energy.

[0076] In addition, the present invention preferably designs the plane size of the beam end plate 21 to be larger than the cross-sectional size of the steel beam 300. The main purposes are: first, to increase the size of the end plate to form an expansion at the beam end so as to facilitate the arrangement of the first connecting plate 22 and the second connecting plate 23 at the beam end; second, the cross section of the steel beam is generally an H-shaped or box-shaped cross section, and adding an end plate facilitates connection; third, to increase the rigidity of the beam end node, reduce the deformation of the beam end, and try to control most of the deformation to occur in the energy consumption area, thereby improving the energy consumption capacity of the rigid node and improving the energy consumption efficiency. At this time, in order to ensure the rigidity of the beam end plate 21, it is necessary to weld and connect the stiffening plate 24 between the back of the beam end plate 21 and the steel beam 300, for example, to weld and connect with the upper and lower flanges of the steel beam 300, and the stiffening plate 24 is symmetrically arranged on the upper and lower flanges of the steel beam 300. In addition to meeting the calculation requirements, the size of the stiffening ribs must also meet the structural requirements.

[0077] like Figure 4As shown, another form of rigid connection node is shown. In this embodiment, the frame column 200 is a steel column, such as an H-shaped steel column. The rigid connection node 100 is basically the same as the case of a concrete column. The difference is that there is no need to set a column body embedded part 11 on the steel column. The first column side connecting plate 12 and the second column side connecting plate 13 are directly welded and fixed to the steel column. For the H-shaped steel column, they are welded and fixed to the flange plate.

[0078] On the basis of the rigid connection node 100 , by connecting the frame column 200 and the steel beam 300 , an energy-absorbing beam-column structural system can be obtained.

[0079] The energy-absorbing beam-column rigid connection node and the energy-absorbing beam-column structural system involved in the present invention can be widely used in industrial and civil multi-story steel structure buildings.

[0080] The terms used in this document are selected to best explain the principles of the embodiments, practical applications or technical improvements in the marketplace, or to enable other ordinary technicians in this technical field to understand the embodiments disclosed herein.

[0081] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. An energy-absorbing beam-column rigid joint, characterized in that: The newly connected nodes include: A column side fixing member, the column side fixing member comprises a first column side connecting plate and a second column side connecting plate, at least two groups of the first column side connecting plates are welded and fixed to the column body on one side of the frame column corresponding to the steel beam, and are arranged at intervals up and down, the second column side connecting plate is welded and fixed to the column body on one side of the frame column corresponding to the steel beam, and is located between the two groups of the first column side connecting plates; A beam end fixing member, the beam end fixing member comprises a beam end plate, a first beam end connecting plate and a second beam end connecting plate, wherein the beam end plate is welded and fixed to the beam end of the steel beam on one side of the frame column corresponding to the beam, at least two groups of the first beam end connecting plates are welded and fixed to the beam end plate and correspond to at least two groups of the first column side connecting plates, the second beam end connecting plate is welded and fixed to the beam end plate and is located between the two groups of the first beam end connecting plates and corresponds to the second column side connecting plate; A connecting member, the connecting member includes a variable stiffness connecting rod and a pin, at least two groups of the variable stiffness connecting rods respectively connect the first connecting plate on the column side and the first connecting plate on the beam end, and the pin connects the second connecting plate on the column side and the second connecting plate on the beam end.

2. The rigid joint according to claim 1, characterized in that: When the frame column is a concrete column, a column side embedded steel plate is embedded in the column body on the corresponding side of the steel beam, and the first column side connecting plate and the second column side connecting plate are both welded and fixed to the column side embedded steel plate; When the frame column is a steel column, the first column-side connecting plate and the second column-side connecting plate are both welded and fixed to the steel column.

3. The rigid joint according to claim 2, characterized in that: The back of the pre-embedded steel plate on the column side is anchored in the concrete column through anchor bars.

4. The rigid joint according to claim 1, characterized in that: The second connecting plate on the column side and the second connecting plate at the beam end both adopt ear plates, and the ear plates are strongly welded to the frame columns, steel beams, etc.

5. The rigid joint according to claim 4, characterized in that: The cross-sectional strength of the ear plate shall not be less than 1.3 times the strength of the web of the steel beam, and the shear bearing capacity of the pin shall not be less than 1.2 times the shear bearing capacity of the ear plate.

6. The rigid joint according to claim 1, characterized in that: The variable stiffness connecting rod is fixed to the first connecting plate on the column side and the first connecting plate on the beam end by bolt connection.

7. The rigid joint according to claim 1, characterized in that: The variable stiffness connecting rod is made of low yield point steel so as to yield before the end of the steel beam.

8. The rigid joint according to claim 7, characterized in that: The variable stiffness link adopts a BRB support or a small viscous damper.

9. The rigid joint according to claim 1, characterized in that: The plane size of the beam end plate is larger than the cross-sectional size of the steel beam, and a stiffening plate is welded and connected between the back of the beam end plate and the steel beam, and the stiffening plates are symmetrically arranged at the top and bottom of the steel beam.

10. An energy-absorbing beam-column structural system, comprising a frame column and a steel beam, characterized in that: The frame column and the steel beam are connected via the rigid connection node described in any one of claims 1 to 9.

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