Fabricated composite energy-consuming steel beam column joint with strong and weak axis characteristics

Abstract

The invention belongs to the technical field of assembly type steel structures and seismic resistance and shock absorption, and particularly relates to an assembly type composite energy dissipation steel beam column joint with strong and weak axis characteristics. A flange of a frame column is connected with a strong-axis frame beam, and a soft steel energy dissipation device is arranged between the frame column and the strong-axis frame beam; lower end plates of the mild steel energy dissipation devices are connected with flanges of the strong-axis frame beams, and upper end plates of the mild steel energy dissipation devices are connected with flanges of the frame columns; webs of the frame columns are connected with the weak-axis frame upper beam and the weak-axis frame lower beam, the frame columns are connected with the weak-axis frame upper beam and the weak-axis frame lower beam through respective end plates, and a rubber cushion plate is arranged between every two corresponding end plates. The end plate on one side of the frame column, the rubber cushion plate and the end plate on one side of the weak-axis frame upper beam or the weak-axis frame lower beam are connected through disc spring bolt energy dissipation assemblies. According to the steel beam column joint, the differentiation design concept of a strong axis and a weak axis is fused, the double beams are arranged in the weak axis direction, the overall stability and bearing capacity of the structure are improved, and the energy dissipation capacity of the joint is enhanced through energy dissipation devices in different directions.

Description

Technical Field

[0001] The invention belongs to the technical field of assembled steel structure and anti-seismic and shock-absorbing technology, and in particular relates to an assembled composite energy-absorbing steel beam-column node with strong and weak axis characteristics. Background Art

[0002] With the development of modern construction technology, prefabricated steel structures have attracted widespread attention due to their advantages such as fast construction speed, high material utilization rate, and low environmental impact. In earthquake-prone areas, the seismic performance of structures is particularly important. The beam-column nodes of steel structures are key parts for force transmission and distribution, and their performance is directly related to the seismic performance of the entire structure. Traditional steel beam-column nodes are prone to local buckling and weld cracking under earthquakes, resulting in reduced seismic performance of the structure. Therefore, improving the seismic performance and damage controllability of steel beam-column nodes has become a hot research topic.

[0003] H-shaped steel beam-column joints usually show obvious strong and weak axis characteristics, that is, they have higher bearing capacity and stiffness in one direction (strong axis), but are relatively weak in the other direction (weak axis). This characteristic is particularly significant under horizontal loads such as earthquakes and wind loads, which may lead to asymmetric structural response and concentration of local damage, and have an adverse effect on the seismic performance of the structure. Studies have shown that both earthquake action and seismic response of frame structures have multidimensional effects. In this process, steel beam-column joints are subjected to the combined action of multiple internal forces such as bending moment, shear force, torque and axial force from different directions. The combined action of these internal forces can easily cause node damage. Strong earthquake damage surveys in recent years have further confirmed the multidimensional characteristics of the seismic response of steel beam-column joints. Node damage and the formation of plastic hinges at the ends of beams are particularly common in frame structures. Therefore, by adding energy dissipation devices in different directions of steel beam-column joints, the components in these devices are preferentially plastically deformed and absorb energy, which can effectively enhance the energy dissipation capacity of steel beam-column joints, thereby significantly improving their seismic and shock-absorbing performance.

[0004] In the design of steel beam-column joints, especially in the weak axis direction, traditional single-beam structures often face the problem of insufficient bearing capacity and stability, which limits the performance and safety of steel structure buildings. Although some improvement measures have been taken, they are often accompanied by increased material usage and increased construction complexity. In response to this challenge, setting up a double-beam structure in the weak axis direction of the steel beam-column joint can improve the overall stability and bearing capacity of the structure, providing a new and effective solution for the design and construction of steel structure buildings. Summary of the invention

[0005] In order to enable the steel beam-column node to effectively dissipate energy when subjected to earthquakes in different directions and to improve the replaceability of the node after an earthquake, the present invention provides an assembled composite energy-absorbing steel beam-column node with strong and weak axis characteristics.

[0006] The purpose of the present invention is to be achieved by adopting the following technical solutions. According to the present invention, an assembled composite energy-absorbing steel beam-column node with strong and weak axis characteristics includes a frame column, a strong axis frame beam, a weak axis frame upper beam, and a weak axis frame lower beam. The flange of the frame column is connected to the strong axis frame beam. In the strong axis direction, a soft steel energy-absorbing device is arranged between the frame column and the strong axis frame beam. The lower end plate of the soft steel energy-absorbing device is connected to the flange of the strong axis frame beam, and the upper end plate is connected to the flange of the frame column. In the weak axis direction, the web of the frame column is connected to the weak axis frame upper beam and the weak axis frame lower beam. The frame column is connected to the weak axis frame upper beam and the weak axis frame lower beam through their respective end plates. A rubber pad is arranged between the two corresponding end plates. The end plate on one side of the frame column, the rubber pad and the end plate on one side of the weak axis frame upper beam or the weak axis frame lower beam are connected by a disc spring bolt energy-absorbing assembly.

[0007] Furthermore, the flange of the strong axis frame beam and the flange of the frame column are connected by T-shaped steel connectors, and the connection between the flange of the strong axis frame beam and the web of the T-shaped steel connector, and the connection between the flange of the frame column and the flange of the T-shaped steel connector are both connected by high-strength bolts.

[0008] Furthermore, the bolt holes of the frame columns, strong axis frame beams and T-shaped steel connectors used to install high-strength bolts are 1-3 mm larger than the diameter of the screw rods of the high-strength bolts.

[0009] Furthermore, a spacing is left between the end of the strong axis frame beam and the flange of the corresponding T-shaped steel connector.

[0010] Furthermore, a spacing is left between the flange of the T-shaped steel connector on the same side of the frame column and the strong axis frame beam and the corresponding upper end plate, and a spacing is left between the web and the corresponding lower end plate.

[0011] Furthermore, the soft steel energy dissipation device includes an inner arc connecting plate, an outer arc connecting plate, soft steel, an upper end plate, and a lower end plate. The inner arc connecting plate and the outer arc connecting plate are parallel to each other and outer arc connecting plates are provided on both sides of the inner arc connecting plate. One end of the inner arc connecting plate is located on the upper end plate, and one end of the outer arc connecting plate is located on the lower end plate. The other ends of the inner arc connecting plate and the outer arc connecting plate are both in a suspended state. The inner arc connecting plate and the outer arc connecting plate are connected by multiple groups of soft steels distributed along the arc length. The width direction of the soft steel is parallel to the width direction of the inner arc connecting plate and the outer arc connecting plate. Each group of soft steel includes two soft steels distributed in its width direction, and the shape of the soft steel is X-shaped.

[0012] Furthermore, a partition is vertically welded to the web of the frame column, stiffening ribs are welded to both ends of the partition, and end plates are welded to the other ends of the stiffening ribs and the partition. The end plate on one side of the frame column is connected to the end plate on the upper beam of the weak axis frame or the lower beam of the weak axis frame through a disc spring bolt energy-absorbing assembly.

[0013] Furthermore, the disc spring bolt energy dissipation assembly includes a screw, a nut, a gasket, a lead damper, and a disc spring. The gasket and the lead damper are sequentially sleeved on the screw and then passed through the end plate and the rubber pad. Then the gasket, the disc spring, the gasket, and the nut are sequentially installed on the other end of the screw.

[0014] Compared with the prior art, the present invention is beneficial in that: The steel beam-column node integrates the differentiated design concepts of strong axis and weak axis. In order to provide greater torsional rigidity and bending resistance and enhance the stability of the entire node, a double-beam structure is set in the weak axis direction to improve the overall stability and bearing capacity of the structure. In order to cope with the impact of seismic waves in different directions on the steel beam-column node, the seismic energy is absorbed by the plastic deformation of the soft steel energy-absorbing device in the strong axis direction, and the energy-absorbing capacity of the steel beam-column node is enhanced by the deformation of the disc spring bolt energy-absorbing component in the weak axis direction. Relying on energy-absorbing devices in different directions to enhance the energy-absorbing capacity of the node can effectively reduce the seismic response of the main structure.

[0015] In order to avoid brittle failure of the steel beam-column node due to tearing of the weld during an earthquake, existing technologies have proposed improvement measures such as strengthening and weakening, aiming to achieve the outward movement of the plastic hinge. Since it is difficult to replace damaged components in welded steel beam-column nodes, the steel beam-column node components adopt a detachable connection method to improve their overall deformation capacity and replaceability after an earthquake. All components of the steel beam-column node can be connected by high-strength bolts or disc spring bolt energy-dissipating components. This design simplifies the on-site construction process, enables rapid replacement of components after an earthquake, improves post-earthquake recovery efficiency, enhances the recoverability of the structure after an earthquake, and significantly improves the level of prefabricated industrialization of the node, which is in line with the development concept of prefabricated buildings in my country.

[0016] A soft steel energy-absorbing device is added to the steel beam-column node in the strong axis direction to make the node have a stronger energy-absorbing capacity; a rubber plate is added at the connection between the weak axis beam and the column, which can provide a certain elastic buffer when subjected to external loads and reduce the impact of impact force on the component; a disc spring bolt energy-absorbing component is used to protect the steel beam-column node.

[0017] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following specifically cites a preferred embodiment and describes it in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional schematic diagram of an embodiment of an assembled composite energy-absorbing steel beam-column node with strong and weak axis characteristics of the present invention; Figure 2 for Figure 1Arrangement of the mild steel energy dissipation device in the direction of the medium-strong axis; Figure 3 for Figure 1 Schematic diagram of medium-soft steel energy dissipation device; Figure 4 for Figure 3 Structural diagram of mild steel in mild steel energy dissipation device; Figure 5 for Figure 1 Schematic diagram of the T-shaped steel connector; Figure 6 for Figure 1 Schematic diagram of the beam-column joint in the direction of the weak axis; Figure 7 for Figure 6 Schematic diagram of the end plate connection in the weak axis direction; Figure 8 for Figure 6 Schematic diagram of the energy dissipation assembly of the middle disc spring bolt; Fig. 9 for Figure 8 A cross-sectional view of the energy dissipation assembly of the middle disc spring bolt; Fig.10 for Fig. 9 Schematic diagram of the middle disc spring.

[0019] Reference numerals 1-frame column, 2-strong axis frame beam, 3-weak axis frame upper beam, 4-weak axis frame lower beam, 5-high-strength bolts, 6-T-steel connector, 7-rubber pad, 8-stiffening rib, 9-partition, 10-mild steel energy dissipation device, 11-disc spring bolt energy dissipation assembly, 12-inner arc connecting plate, 13-outer arc connecting plate, 14-mild steel, 15-upper end plate, 16-lower end plate, 17-end plate, 18-screw, 19-nut, 20-gasket, 21-lead damping, 22-disc spring. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0021] An embodiment of an assembled composite energy-absorbing steel beam-column node with strong and weak axis characteristics of the present invention is as follows: Figures 1 to 10As shown, the node includes a frame column 1, a strong axis frame beam 2, a weak axis frame upper beam 3, a weak axis frame lower beam 4, a rubber pad 7, a stiffening rib 8, a partition 9, a soft steel energy dissipation device 10, and a disc spring bolt energy dissipation assembly 11. This node is based on the traditional steel beam-column node, and a soft steel energy dissipation device 10 is added in the strong axis direction. When the structure is subjected to an earthquake, the soft steel energy dissipation device 10 takes the lead in resisting the earthquake and controlling the deformation and damage of the structure.

[0022] In the strong axis direction, the frame column 1 is connected to the strong axis frame beam 2 through the T-steel connector 6. In order to facilitate the replaceability of the components after the earthquake, the flange of the frame column 1 and the flange of the T-steel connector 6, and the flange of the strong axis frame beam 2 and the web of the T-steel connector 6 are connected by high-strength bolts 5. The upper and lower flanges of the strong axis frame beam 2 are connected to the frame column 1 through the T-steel connector 6. In this embodiment, bolt holes that are 1-3mm larger than the diameter of the screw rod of the high-strength bolt 5 are set on the frame column 1, the strong axis frame beam 2 and the T-steel connector 6, which is convenient for the construction and installation of the high-strength bolt 5, and when the structure resists the earthquake, a certain relative slip is allowed between the structural components, thereby enhancing the relative rotation between the beams and columns and alleviating the damage to the nodes caused by the earthquake. In this embodiment, a soft steel energy dissipation device 10 is installed 10-30 mm away from the flange and web edge of the T-steel connector 6. It absorbs and dissipates seismic energy through a unique energy dissipation mechanism and provides a certain ductility to improve the seismic performance of the node.

[0023] The mild steel energy dissipation device 10 comprises an inner arc connecting plate 12, an outer arc connecting plate 13, mild steel 14, an upper end plate 15, and a lower end plate 16. The inner arc connecting plate 12 is connected to the upper end plate 15, and the outer arc connecting plate 13 is connected to the lower end plate 16. The other ends of the inner arc connecting plate 12 and the outer arc connecting plate 13 are both in a suspended state, and the arc length from the inner arc connecting plate 12 to the lower end plate 16 is the same as the arc length from the outer arc connecting plate 13 to the upper end plate 15 (the arc length is 0.25-0.5L, where L is the length of the center arc line of the inner arc connecting plate 12 or the outer arc connecting plate 13). The inner arc connecting plate 12 and the outer arc connecting plate 13 are connected into a whole through 6-8 groups of mild steel 14 of the same shape and perpendicular to the arc connecting plate (inner arc connecting plate 12 or outer arc connecting plate 13). The width direction of the mild steel 14 is parallel to the width direction of the inner arc connecting plate 12 and the outer arc connecting plate 13. The mild steel 14 is arranged at intervals of 50-100mm along the arc direction, and its thickness is 6-12mm. The shape of the mild steel 14 is X-shaped, and its minimum width is located at 0.5P (P is the net spacing between the inner arc connecting plate 12 and the outer arc connecting plate 13), and the maximum width B of the mild steel 14 is 1 / 3-1 / 2 of the width of the arc connecting plate. Two mild steels 14 (i.e., a group of mild steels 14) are vertically arranged at the same position between the inner arc connecting plate 12 and the outer arc connecting plate 13. A group of mild steels 14 includes two mild steels 14 distributed in the width direction of the mild steel 14. In the length direction of the mild steel 14, the width of the mild steel 14 first decreases and then increases. In order to enhance the aesthetics of the component, the outer edge of the intersection of the mild steel 14 section change is chamfered, and the chamfer angle R is 10°-30°.

[0024] The upper end plate 15 is installed on the frame column 1 at a distance of 10-30mm from the flange edge of the corresponding T-shaped steel connector 6, and the lower end plate 16 is installed on the strong axis frame beam 2 at a distance of 10-30mm from the web edge of the corresponding T-shaped steel connector 6, so that there is a certain gap between the T-shaped steel connector 6 and the soft steel energy dissipation device 10, allowing the two components to slide without interfering with each other. The upper end plate 15 and the flange of the frame column 1, and the lower end plate 16 and the flange of the strong axis frame beam 2 are connected by high-strength bolts 5. The projections of the inner arc connecting plate 12 and the outer arc connecting plate 13 in the direction parallel to the weak axis overlap, and the radius of the arc formed by the projection of the inner arc connecting plate 12 and the outer arc connecting plate 13 is equal and the center of the circle coincides. In order to ensure that the steel beam-column node has a certain rotation ability, the distance between the end of the strong axis frame beam 2 and the flange of the corresponding T-shaped steel connector 6 is 10-30mm.

[0025] In order to enhance the rapid replaceability of the steel beam-column joint after an earthquake, the components are connected by high-strength bolts 5. In this embodiment, the distance from the center position of the outermost high-strength bolt 5 on the component to the edge of the corresponding component is 30-60 mm, and the distance between the centers of two high-strength bolts 5 is 70-100 mm.

[0026] In order to provide greater torsional rigidity and bending resistance and enhance the overall stability of the node, the single beam on the weak axis of the traditional spatial node is changed to a double beam structure, that is, the weak axis frame upper beam 3 and the weak axis frame lower beam 4. The partition 9 is welded on the web of the frame column 1, and the partition 9 is vertically arranged and vertically welded on the web of the frame column 1. The upper and lower ends of the partition 9 are vertically welded with stiffening ribs 8. The frame column 1, the stiffening rib 8 and the partition 9 are welded as a whole to facilitate the connection between the beam and the column in the weak axis direction. An end plate 17 is respectively arranged at the end of the partition 9, the stiffening rib 8 and the end of the corresponding weak axis frame upper beam 3 or weak axis frame lower beam 4, and the two end plates 17 are butted to facilitate the connection between the column and the beam. The upper flange of the weak axis frame upper beam 3 is flush with the upper flange of the strong axis frame beam 2, and the distance between the weak axis frame upper beam 3 and the weak axis frame lower beam 4 is 100-500mm. In order to avoid local bending deformation of the end plate 17 in the connection area under the action of load, a rubber pad 7 is arranged between the two end plates 17 to increase the allowable deformation capacity of the end plate 17 and reduce the local bending deformation of the end plate 17 under the action of load. The end plate 17 on one side of the frame column 1 is connected to the end plate 17 on one side of the weak axis frame upper beam 3 or the weak axis frame lower beam 4 by two rows of disc spring bolt energy absorbing components 11. The disc spring bolt energy absorbing component 11 has excellent bidirectional resettability and significantly reduces the post-earthquake residual deformation after encountering extreme loads such as earthquakes. The distance from the center of the disc spring bolt energy absorbing component 11 to the edge of the corresponding component is 40-80mm, and the distance between the centers of the two disc spring bolt energy absorbing components 11 is 60-100mm. The thickness of the end plate 17 and the rubber pad 7 are both 6-12mm.

[0027] The disc spring bolt energy dissipation assembly 11 is an assembled combination bolt, which includes a screw rod 18, a nut 19, a gasket 20, a lead damper 21 and a disc spring 22. The lead damper 21 is sleeved on the screw rod 18, one end of which is against the nut of the screw rod 18 through the corresponding gasket 20 and is connected to the nut, and the other end is against the end plate 17 on one side of the frame column 1. The nut 19 is threadedly connected to the other end of the screw rod 18, one end of the disc spring 22 is against the nut 19 through the corresponding gasket 20, and the other end is against the end plate 17 on one side of the weak axis frame upper beam 3 or the weak axis frame lower beam 4 through the corresponding gasket 20. As the main load-bearing component of the connection assembly, the screw rod 18 should have sufficient strength and rigidity to meet different connection requirements. The nut 19 cooperates with the screw rod 18, and the nut 19 is used to tighten the connection to prevent loosening under load. The gasket 20 is located between the nut 19, the nut of the screw 18 and the corresponding structural member, and is used to protect the surface of the structural member to avoid stress concentration caused by small-area contact and local damage to the component. The lead damper 21 is arranged between the nut of the screw 18 and the corresponding end plate 17, and provides energy dissipation through its plastic deformation, effectively absorbing and consuming energy. The lead damper 21 adopts a circular cross-section, and its diameter should be slightly smaller than the diameter of the corresponding gasket, and the length is 20mm-50mm. The disc spring 22 is arranged between the corresponding end plate 17 and the nut 19, and adopts a matching combination method to enhance the deformation capacity of the disc spring bolt energy dissipation assembly 11. The number of matching combinations is 2-5 groups, and each group includes two matching combinations of disc springs 22. The disc spring bolt energy dissipation assembly 11 has a good two-way self-reset function, and can significantly reduce the post-earthquake residual deformation after encountering extreme loads such as earthquakes.

[0028] The functions of the present invention are summarized as follows: An assembled composite energy-absorbing steel beam-column node with strong and weak axis characteristics is used in the steel frame structure. The components in the steel beam-column node are connected by high-strength bolts 5 or disc spring bolt energy-absorbing assemblies 11, which facilitates the replaceability of components after an earthquake, reduces maintenance costs and repair time, and conforms to the concept of assembled development. The design of the steel beam-column node adopts a double-beam structure to enhance its stability and bearing capacity in the weak axis direction. Soft steel energy-absorbing devices 10 and disc spring bolt energy-absorbing assemblies 11 are respectively provided in the strong axis and weak axis directions of the node. These devices effectively absorb and dissipate seismic energy through plastic deformation. This design reduces damage to the main structure, adds a new line of seismic defense to the structure, and thus improves the seismic resistance of the overall structure.

[0029] Compared with the prior art, the advantages of the present invention are as follows: 1) The present invention discloses an assembled composite energy-absorbing steel beam-column node with strong and weak axis characteristics, which integrates the differentiated design concepts of the strong axis and the weak axis and is configured as a double-beam structure in the weak axis direction. This structure can improve the torsional and bending resistance of the node, enhance the bearing capacity in the weak axis direction, and enhance the structural stability.

[0030] 2) In the assembled composite energy-absorbing steel beam-column node with strong and weak axis characteristics of the present invention, a soft steel energy-absorbing device 10 is used as the core energy-absorbing component in the strong axis direction of the steel beam-column node, and the rotational deformation of the arc plate is limited by the soft steel 14. When an earthquake occurs, the soft steel component in the soft steel energy-absorbing device 10 can effectively dissipate the seismic energy through significant plastic deformation, thereby enhancing the energy absorption and deformation capacity of the steel beam-column node, thereby improving the shock absorption performance and energy consumption efficiency of the entire building structure.

[0031] 3) In the assembled composite energy-absorbing steel beam-column node with strong and weak axis characteristics of the present invention, one end of the outer arc connecting plate 13 and the inner arc connecting plate 12 in the soft steel energy-absorbing device 10 are respectively at a large distance from the upper end plate 15 and the lower end plate 16, which can reserve rotation space for the steel beam-column node, further enhancing the energy absorption capacity of the soft steel energy-absorbing device 10.

[0032] 4) In the assembled composite energy-absorbing steel beam-column node with strong and weak axis characteristics of the present invention, the application of the disc spring bolt energy-absorbing assembly 11 in the steel beam-column node provides an efficient, reliable and economical seismic solution, enhances the overall collaborative working ability of the node, improves the bearing capacity of the node, and absorbs and dissipates energy through the elastic deformation of the disc spring 22 and the plastic deformation of the lead damper 21, thereby improving the seismic performance of the structure, reducing node damage under earthquake action, and realizing the self-resetting ability of the node.

[0033] 5) In the assembled composite energy-absorbing steel beam-column node with strong and weak axis characteristics of the present invention, by applying energy-absorbing technologies such as soft steel energy-absorbing devices 10 and disc spring bolt energy-absorbing components 11, the plastic deformation of the steel beam-column node can be effectively reduced, thereby enhancing its shock absorption and seismic performance and energy-absorbing capacity. After an earthquake occurs, by replacing these energy-absorbing devices, the function of the structure can be quickly restored, thereby improving the seismic toughness and use efficiency of the entire structure.

[0034] 6) In the assembled composite energy-absorbing steel beam-column node with strong and weak axis characteristics of the present invention, during construction, each component can be prefabricated in a factory, processed and transported to the site, and then installed using high-strength bolts 5 and disc spring bolt energy-absorbing components 11. This method improves the assembly and assembly speed of the building structure, fully reflects the requirements and characteristics of the assembled steel structure, and effectively solves the problem of low level of building industrialization in my country.

[0035] 7) In the assembled composite energy-absorbing steel beam-column node with strong and weak axis characteristics of the present invention, in the strong axis direction, the beams and columns are connected by T-shaped steel connectors 6 and high-strength bolts 5; in the weak axis direction, the end plates 17 and the disc spring bolt energy-absorbing components 11 are used for connection. These connection methods are typical semi-rigid connections, which not only give the steel beam-column node a certain rotation ability and enhance the seismic performance of the node, but also effectively prevent the node from brittle failure.

[0036] 8) In an assembled composite energy-absorbing steel beam-column node with strong and weak axis characteristics of the present invention, a rubber pad 7 is arranged between the end plate 17 on one side of the frame column 1 in the weak axis direction and the end plate 17 on one side of the weak axis frame upper beam 3 and the weak axis frame lower beam 4, which provides a certain flexible connection, allowing the structure to have a certain deformation space when subjected to force, adjusting the relative displacement between the weak axis frame upper beam 3, the weak axis frame lower beam 4 and the corresponding stiffening rib 8, reducing stress concentration and the vibration response of the node, and thereby improving the seismic performance of the steel beam-column node.

[0037] Embodiment 1: 1) In the assembled composite energy-absorbing steel beam-column node with strong and weak axis characteristics described in the present invention, in the spatial node, the rotation axis around the maximum moment of inertia and section modulus is defined as the strong axis direction, and the rotation axis around the minimum moment of inertia and section modulus is defined as the weak axis direction. The main load-bearing components in the steel beam-column node are frame columns 1, strong axis frame beams 2, weak axis frame upper beams 3, and weak axis frame lower beams 4. Figure 1 The schematic diagram shown is a spatial node of a column in a frame structure, which is taken from a building with a height of 3m and a span of 3.6m for both the strong axis and weak axis. The frame column 1 is selected at 1.5m on the upper and lower floors, and the left and right parts of the strong axis frame beam 2 and the weak axis frame upper beam 3 or the weak axis frame lower beam 4 are all selected at 1.8m. The frame column 1 adopts HW300×300×10×15 hot-rolled H-shaped steel, and all beams adopt HN350×175×7×11 hot-rolled H-shaped steel. The connection method and cross-sectional dimensions of the weak axis frame upper beam 3, weak axis frame lower beam 4 and frame column 1 are the same. The distance between the double beams is 250mm, and this spacing avoids mutual collision between components in the steel beam-column node, and a certain space is reserved for bolt installation.

[0038] 2) Reference Figure 2 , the strong axis frame beam 2 is directly opposite to the flange of the frame column 1, the flange of the T-shaped steel connector 6 is close to the flange of the frame column 1, the web of the T-shaped steel connector 6 is close to the flange of the strong axis frame beam 2, and two rows and two columns of high-strength bolts 5 are used to connect the frame column 1, the strong axis frame beam 2 and the T-shaped steel connector 6 into a whole, forming a typical semi-rigid node. In order to increase the energy dissipation capacity of the steel beam-column node, a soft steel energy dissipation device 10 is set in the strong axis direction, the lower end plate 16 of the soft steel energy dissipation device 10 is connected to the flange of the strong axis frame beam 2 at a distance of 20mm from the web edge of the corresponding T-shaped steel connector 6, and the upper end plate 15 of the soft steel energy dissipation device 10 is connected to the flange of the frame column 1 at a distance of 20mm from the flange edge of the corresponding T-shaped steel connector 6. The connection between the soft steel energy dissipation device 10 and the frame column 1 and the strong axis frame beam 2 is fixed by two rows and two columns of high-strength bolts 5, so as to realize the replaceability of the device after the earthquake.

[0039] 3) Reference Figure 3The center arc lines of the inner arc connecting plate 12 and the outer arc connecting plate 13 in the mild steel energy dissipation device 10 are parallel to each other, one end of the inner arc connecting plate 12 is located at the center of the upper end plate 15, and one end of the outer arc connecting plate 13 is located 20mm away from the corresponding edge of the lower end plate 16. The other ends of the inner arc connecting plate 12 and the outer arc connecting plate 13 are both suspended, and the two sections of the suspended distance are the same, which is 1 / 3 of the length of the center arc line of the arc connecting plate. Two mild steels 14 are arranged along the width direction of the arc connecting plate, and 6 groups of mild steels 14 are arranged at intervals of 60mm along the arc direction. The width of the upper end plate 15 and the lower end plate 16 is the same as the flange width of the strong axis frame beam 2, the length is 150-300mm, and the thickness is 6-12mm.

[0040] 4) Reference Figure 4 The shape of the mild steel 14 is X-shaped, and its minimum width is located at 0.5P (P is the net distance between the inner arc connecting plate 12 and the outer arc connecting plate 13), and the width is half of the height of the arc connecting plate. In order to enhance the aesthetics of the component, the outer edge of the cross-section change intersection of the mild steel 14 is chamfered, and the chamfer angle is 20°.

[0041] 5) Reference Figure 5 When installing with high-strength bolts 5, in order to reduce the difference in pre-tension of high-strength bolts 5 that are tightened first and later, the tightening of high-strength bolts 5 on the same T-shaped steel connector 6 must be divided into two steps: initial tightening and final tightening. Final tightening torque = torque coefficient × pre-tension × bolt nominal diameter, and the initial tightening torque is 50% of the final tightening torque. High-strength bolts 5 are arranged in two rows and two columns. The diameter of the bolt hole is 2mm larger than the diameter of the screw, and the distance between the centers of two adjacent bolt holes is 4d0 (d0 is the diameter of the bolt hole), and the distance from the center of the bolt hole to the edge of the corresponding connecting member is 2d0.

[0042] 6) Reference Figure 6 and Figure 7The thickness of the auxiliary connecting components stiffening ribs 8 and partitions 9 in the weak axis direction are respectively the same as the thickness of the flange and web of the weak axis frame upper beam 3 or the weak axis frame lower beam 4, and the stiffening ribs 8, partitions 9 are fixed to the frame column 1 by double-sided groove right-angle fillet welding to form a whole. In order to facilitate the connection of the weak axis frame upper beam 3, the weak axis frame lower beam 4 and the corresponding stiffening ribs 8 and partitions 9 through the disc spring bolt energy dissipation component 11, the end plates 17 of the same thickness are welded at the ends of the stiffening ribs 8, partitions 9 and the weak axis frame upper beam 3, and the weak axis frame lower beam 4, with a thickness of 10mm. At the same time, a rubber pad 7 with excellent elasticity and friction is arranged between the two matching end plates 17 to reduce the local bending deformation of the end plates 17 under load. The end plate 17 on one side of the frame column 1, the rubber pad 7 and the end plate 17 on one side of the weak axis frame upper beam 3 or the weak axis frame lower beam 4 are connected by two rows and two columns of disc spring bolt energy absorbing components 11, and two disc spring bolt energy absorbing components 11 are connected to both sides of the web of the weak axis frame upper beam 3 and the weak axis frame lower beam 4. The distance between the center of the hole of the disc spring bolt energy absorbing component 11 and the edge of the corresponding end plate 17 is twice the diameter of the hole, and the distance between the centers of two adjacent holes is 4 times the diameter of the hole.

[0043] 7) Reference Figure 8 and Fig. 9 When installing the disc spring bolt energy dissipation assembly 11, the gasket 20 and the lead damper 21 should be put on the screw 18 first. After the screw 18 passes through the corresponding connecting fixed component (end plate 17 and rubber pad 7), the gasket 20, disc spring 22, gasket 20 and nut 19 should be installed on the screw 18 in sequence. Finally, the torque wrench is used to tighten the nut 19 by initial tightening and final tightening to complete the installation. Among them, the lead damper 21 adopts a circular cross-section, and its diameter should be slightly smaller than the gasket diameter, and the length is 30mm. The disc spring 22 in the disc spring bolt energy dissipation assembly 11 adopts a matching combination to enhance the deformation capacity of the disc spring bolt energy dissipation assembly 11, and the number of matching combinations is 4 groups.

[0044] 8) Reference Fig.10 The maximum outer diameter of the disc spring 22 in the disc spring bolt energy dissipation assembly 11 is 28 mm, the inner diameter is 14.2 mm, and the height is 2.5 mm. The deformation of the combined assembly is the sum of the deformations of each disc spring 22. The deformation of the disc spring 22 is used to absorb energy, which can reduce the serious damage to the node components caused by the earthquake. After the earthquake, only the disc spring components in the disc spring bolt energy dissipation assembly 11 are replaced, thereby improving the post-earthquake recovery efficiency and reducing the recovery cost.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An assembled composite energy-absorbing steel beam-column node with strong and weak axis characteristics, characterized in that: The invention comprises a frame column (1), a strong axis frame beam (2), a weak axis frame upper beam (3), and a weak axis frame lower beam (4); the flange of the frame column (1) is detachably connected to the strong axis frame beam (2); in the direction of the strong axis, a soft steel energy dissipation device (10) is arranged between the frame column (1) and the strong axis frame beam (2); the lower end plate (16) of the soft steel energy dissipation device (10) is detachably connected to the flange of the strong axis frame beam (2), and the upper end plate (15) is detachably connected to the flange of the frame column (1); in the direction of the weak axis, the frame The web of the frame column (1) is connected to the weak axis frame upper beam (3) and the weak axis frame lower beam (4); the frame column (1) is connected to the weak axis frame upper beam (3) and the weak axis frame lower beam (4) via respective end plates (17); a rubber pad (7) is arranged between two corresponding end plates (17); and the end plate (17) on one side of the frame column (1), the rubber pad (7) and the end plate (17) on one side of the weak axis frame upper beam (3) or the weak axis frame lower beam (4) are connected via a disc spring bolt energy dissipation assembly (11).

2. The assembled composite energy-absorbing steel beam-column node with strong and weak axis characteristics according to claim 1 is characterized in that: The flange of the strong axis frame beam (2) and the flange of the frame column (1) are connected by means of a T-shaped steel connector (6), and the connection between the flange of the strong axis frame beam (2) and the web of the T-shaped steel connector (6) and the connection between the flange of the frame column (1) and the flange of the T-shaped steel connector (6) are both connected by means of high-strength bolts (5).

3. The assembled composite energy-absorbing steel beam-column node with strong and weak axis characteristics according to claim 2 is characterized in that: The bolt holes of the frame column (1), the strong axis frame beam (2) and the T-shaped steel connecting piece (6) for installing the high-strength bolts (5) are 1-3 mm larger than the diameter of the screw rod of the high-strength bolt (5).

4. The assembled composite energy-absorbing steel beam-column node with strong and weak axis characteristics according to claim 2 is characterized in that: A spacing is left between the end of the strong axis frame beam (2) and the flange of the corresponding T-shaped steel connecting piece (6).

5. The assembled composite energy-absorbing steel beam-column node with strong and weak axis characteristics according to claim 2 is characterized in that: A spacing is left between the flange of the T-shaped steel connector (6) on the same side of the frame column (1) and the strong axis frame beam (2) and the corresponding upper end plate (15), and a spacing is left between the web and the corresponding lower end plate (16).

6. The assembled composite energy-absorbing steel beam-column node with strong and weak axis characteristics according to claim 1 is characterized in that: The soft steel energy dissipation device (10) comprises an inner arc connecting plate (12), an outer arc connecting plate (13), soft steel (14), an upper end plate (15), and a lower end plate (16); the inner arc connecting plate (12) and the outer arc connecting plate (13) are parallel to each other, and outer arc connecting plates (13) are provided on both sides of the inner arc connecting plate (12); one end of the inner arc connecting plate (12) is located on the upper end plate (15), and one end of the outer arc connecting plate (13) is located on the lower end plate (16); and the other ends of the inner arc connecting plate (12) and the outer arc connecting plate (13) are both in a suspended state; the inner arc connecting plate (12) and the outer arc connecting plate (13) are connected by a plurality of groups of soft steel (14) distributed along the arc length; the width direction of the soft steel (14) is parallel to the width direction of the inner arc connecting plate (12) and the outer arc connecting plate (13); each group of soft steel (14) comprises two soft steels (14) distributed in its width direction; and the shape of the soft steel (14) is X-shaped.

7. The assembled composite energy-absorbing steel beam-column node with strong and weak axis characteristics according to claim 1 is characterized in that: The web of the frame column (1) is vertically welded with a partition plate (9), stiffening ribs (8) are welded to both ends of the partition plate (9), and the other ends of the stiffening ribs (8) and the partition plate (9) are welded with an end plate (17), and the end plate (17) on one side of the frame column (1) is connected to the end plate (17) on the weak axis frame upper beam (3) or the weak axis frame lower beam (4) via a disc spring bolt energy dissipation assembly (11).

8. The assembled composite energy-absorbing steel beam-column node with strong and weak axis characteristics according to claim 1 is characterized in that: The disc spring bolt energy dissipation assembly (11) comprises a screw rod (18), a nut (19), a washer (20), a lead damper (21), and a disc spring (22). The washer (20) and the lead damper (21) are sequentially sleeved on the screw rod (18) and then passed through the end plate (17) and the rubber pad (7). Then, the washer (20), the disc spring (22), the washer (20), and the nut (19) are sequentially installed on the other end of the screw rod (18).

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