Fabricated beam-column connecting joint of additional chain rod type buckling constraint staged energy consumption device

Abstract

The utility model provides an assembly type beam-column connection node of an additional chain rod type buckling constraint staged energy consumption device, which comprises a steel column, a beam column, a beam column and a beam column, the two ends of the steel beam are in butt joint with the cantilever beams on the steel columns on the two sides; each set of chain rod type buckling constraint staged energy consumption device comprises two flange cover plates with lug plates, and the two flange cover plates are connected to the inner sides of an upper flange and a lower flange at the butt joint position of the steel beam and the cantilever beam at the butt joint position through high-strength bolt groups correspondingly; the two web connecting plates with crescent ear plates are respectively connected to the upper parts and the lower parts of webs of the steel beam and the cantilever beam at the butt joint part through high-strength bolt groups; and the two pin shaft anti-shearing damping chain rods respectively penetrate through the lug plates and the crescent lug plates to connect the flange cover plates with the lug plates and the web connecting plates with the crescent lug plates. According to the utility model, through the additional chain rod type buckling constraint staged energy consumption device, the elastic work under small and medium earthquakes is realized, the plasticity is realized under large earthquakes and super-large earthquakes, and the dog bone weakening type flange cover plate on the pressed side can be effectively prevented from buckling too early and losing the bearing capacity.

Description

Technical Field

[0001] The utility model relates to the technical field of building structures, in particular to prefabricated assembled structures, and specifically to an assembled beam-column connection node with an additional chain-rod type buckling restraint step-by-step energy dissipation device. Background Art

[0002] Prefabricated steel structures, with their advantages of sustainability, low consumption, and high industrialization, relatively perfectly make up for the disadvantages of traditional structural solutions and adapt to the current concept of sustainable development.

[0003] The steel frame beam-column connection nodes designed based on the design concepts of centralized control of plastic damage and replaceable energy-absorbing elements can effectively control the plastic damage on the energy-absorbing elements, while keeping the main structure in an elastic state. After an earthquake, only the energy-absorbing elements that have caused irreversible plastic damage need to be replaced to restore the structural function of the building, thus reducing the difficulty of post-earthquake repair of traditional steel structures and further reducing the economic losses caused by repair difficulties and loss of building functions.

[0004] As an important lateral resistance system, steel frame structure is widely used in earthquake-prone areas. The beam-column connection node plays an important role in transferring the plate load to the vertical load-bearing components. The frame structure designed according to the traditional design concept dissipates seismic energy through plastic deformation in the core area, such as the plastic hinge of the beam segment. This design method is recognized by most designers for its relatively clear force mechanism and simple and clear structure. However, the plastic hinge of the beam segment may cause negative effects such as strength destruction of the beam-column node domain and instability of the node domain, which will lead to the failure of the vertical load-bearing components, which does not conform to the design concept of "strong column and weak beam" and "strong node". To solve this problem, designers often solve these problems by setting stiffening ribs at the node domain position. The introduction of stiffening ribs makes the originally crowded node domain more complicated, and the stiffening ribs generally need to be welded to the main structure. The introduction of welds makes the stress field in the node domain more complicated, and the complex stress field is prone to unpredictable situations. Summary of the invention

[0005] In view of the shortcomings of the prior art, the utility model provides an assembled beam-column connection node with an additional link-rod type buckling restraint stepped energy dissipation device, aiming to solve the problem that the dog-bone weakening plate of the same type of beam-column node device is prone to buckling and loses its bearing capacity, and to reduce the adverse effects of the plastic hinge at the beam end on the beam-column node domain.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0007] The utility model firstly provides an assembled beam-column connection node with an additional chain-rod buckling restraint stepped energy dissipation device, comprising: a steel column with a cantilever beam thereon, both of which are I-shaped / H-shaped; a steel beam, which is I-shaped / H-shaped, and whose two ends are butt-connected with the cantilever beams on the steel columns on both sides; two sets of chain-rod buckling restraint stepped energy dissipation devices, which are oppositely connected to the two sides of the web at the butt joint of the steel beam and the cantilever beam by bolts, and are used to connect the steel beam and the cantilever beam, and each set of the chain-rod buckling restraint stepped energy dissipation devices comprises: two flange cover plates with ear plates, which are respectively connected to the inner sides of the upper and lower flanges at the butt joint of the steel beam and the cantilever beam by high-strength bolt groups; two web connecting plates with crescent-shaped ear plates, which are respectively connected to the upper and lower parts of the web at the butt joint of the steel beam and the cantilever beam by high-strength bolt groups; two pin-shaft shear damping chain rods, which respectively pass through the ear plates and the crescent-shaped ear plates to connect the flange cover plates with ear plates and the web connecting plates with crescent-shaped ear plates.

[0008] In some embodiments, a gap is reserved at the joint between the steel beam and the cantilever beam.

[0009] In some embodiments, the gap size is 15-25 mm.

[0010] In some embodiments, the flange cover plate with ear plates includes: a middle weakened area, wherein the middle weakened area is formed by opening notches on both sides of the middle section of the cover plate to form a dog-bone weakening; ear plates, wherein a plurality of ear plates are equidistantly arranged in the middle weakened area; and opening areas at both ends, wherein a plurality of bolt holes are opened in the opening areas at both ends, one end of which is connected and fixed to the flange of the steel beam by a group of high-strength bolts, and the other end of which is connected and fixed to the flange of the cantilever beam by a group of high-strength bolts.

[0011] In some embodiments, the ear plate opening of the flange cover plate with ear plates is a circular hole.

[0012] In some embodiments, the web connecting plate with crescent-shaped ear plates includes: a web connecting plate body, wherein at least two groups of bolt holes are symmetrically provided on the web connecting plate body, wherein one group of bolt holes is connected and fixed to the web of the steel beam by a high-strength bolt group, and the other group of bolt holes is connected and fixed to the web of the cantilever beam by a high-strength bolt group; a crescent-shaped ear plate, wherein a plurality of crescent-shaped ear plates are equidistantly arranged on one side of the web connecting plate body close to the flange cover plate with the ear plate, and correspond one-to-one to the ear plates.

[0013] In some embodiments, the crescent-shaped ear plate opening of the web connecting plate with crescent-shaped ear plate is an oblong hole.

[0014] In some embodiments, the flange cover plate with ear plates is an SMA cover plate.

[0015] In some embodiments, the joint between the steel beam and the cantilever beam is tightened.

[0016] The beneficial effects of the utility model compared with the prior art are: the assembled beam-column connection node with an additional chain-rod buckling restraint step-by-step energy dissipation device provided by the utility model can effectively prevent the dog-bone weakened flange cover plate on the compression side from buckling prematurely and losing its bearing capacity under large and super large earthquakes through the additional chain-rod buckling restraint step-by-step energy dissipation device. Specifically, it can at least bring the following beneficial effects:

[0017] 1. The utility model is designed based on the concept of centralized control of plastic damage and replaceable energy-consuming components. All plastic damage can be centralized and controlled on the energy-consuming components, and the main structure remains elastic without irreversible plastic deformation, effectively protecting the main structure from damage. After the earthquake, only the energy-consuming components need to be replaced to achieve continuous structural functions of the building, which reduces the difficulty of building repair and shortens the repair time, is conducive to the rapid recovery of building functions, and thus significantly reduces economic losses.

[0018] 2. The utility model transmits bending moment in the form of tension or pressure through the dog-bone weakened flange cover plate set at the flange. Under the action of tension or pressure, the middle weakened area produces plastic deformation to dissipate part of the energy. The pin shear damping chain rod produces plastic deformation to dissipate part of the energy under the action of shear force. Therefore, through reasonable design, the utility model can have multiple energy dissipation mechanisms, avoiding the failure of the overall connection caused by the failure of a single energy dissipation mechanism, and improving safety and reliability.

[0019] 3. Self-reset and energy dissipation mechanism: The utility model further adopts SMA flange cover, and SMA can provide reliable self-reset force, which can effectively reduce the residual deformation of the beam-column node after the earthquake. In addition, SMA itself can dissipate part of the energy, and the reasonably designed pin shear damping chain rod dissipates part of the energy through shear deformation. The two energy dissipation elements can dissipate energy in a coordinated manner, which improves the reliability of the energy dissipation mechanism of the utility model.

[0020] 4. "Fuse" function: The utility model uses an additional chain-rod type buckling-restrained SMA self-resetting energy dissipation device to effectively prevent the dog-bone weakened flange cover from producing large out-of-plane deformation under moderate and severe earthquakes, causing the SMA to enter the plastic yield stage and deteriorate the energy dissipation and self-resetting performance.

[0021] 5. All welding processes of the utility model can be completed in the prefabrication factory. The prefabrication factory produces standard "modules". The construction site only needs to locate according to the reserved bolt holes and use high-strength bolts to assemble the "modules" to complete the structural installation. It has the characteristics of high modularity. This "building blocks" construction concept reduces the use of labor and reduces the difficulty of construction, thereby effectively shortening the construction period.

[0022] 6. The utility model can be applied to a single layer, and can also be combined with detachable and replaceable shear walls, energy-absorbing supports, etc. to form a frame-shear wall system and a frame-support system, and can be flexibly applied to multi-story and high-rise building systems.

[0023] It should be understood that the implementation of any embodiment of the present utility model 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

[0024] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. 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.

[0025] 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 of 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.

[0026] Figure 1 A three-dimensional diagram of a prefabricated beam-column connection node with an additional link-type buckling restraint step-by-step energy dissipation device;

[0027] Figure 2 It is a decomposition diagram of a prefabricated beam-column connection node with an additional chain-rod type buckling restraint step-by-step energy dissipation device;

[0028] Figure 3 It is a front view of a prefabricated beam-column connection node with an additional link-type buckling restraint staged energy dissipation device;

[0029] Figure 4 This is the decomposition diagram of the chain-rod type buckling restrained staged energy dissipation device.

[0030] Figure 5 A three-dimensional diagram of a prefabricated beam-column connection node with an additional link-type buckling restraint SMA self-resetting energy dissipation;

[0031] Figure 6 It is a decomposition diagram of a prefabricated beam-column connection node with an additional chain-type buckling restraint SMA self-resetting energy dissipation;

[0032] Figure 7 It is a front view of a prefabricated beam-column connection node with an additional chain-type buckling restraint SMA self-resetting energy dissipation.

[0033] Markings in the figure:

[0034] 1-steel column, 11-steel column web stiffener;

[0035] 2-Cantilever beam;

[0036] 3- Steel beam;

[0037] 4-chain-rod buckling-restrained staged energy dissipation device;

[0038] 5-High-strength bolt group;

[0039] 6-flange cover with ear plate, 61-middle weakened area, 62-opening areas at both ends, 63-ear plate;

[0040] 7-web connecting plate with crescent-shaped ear plate, 71-web connecting plate body, 72-crescent-shaped ear plate;

[0041] 8-pin shear damping chain rod.

[0042] In the various drawings, the same or corresponding reference numerals represent the same or corresponding parts. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model more clear, the embodiments of the utility model are further described in detail in combination with the embodiments and drawings. Here, the illustrative embodiments of the utility model and their description are used to explain the utility model, but are not used as limitations of the utility model.

[0044] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" 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.

[0045] 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.

[0046] It is also necessary to understand that terms such as "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" indicating 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 device, component or structure referred to must have a specific direction, be constructed or operate in a specific direction, and cannot be understood as a limitation on the present invention.

[0047] 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 utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0048] like Figure 1-3 As shown, the utility model provides an assembled beam-column connection node with an additional chain-rod type buckling restraint staged energy dissipation device, which mainly includes: a steel column 1, a steel beam 3, two sets of chain-rod type buckling restraint staged energy dissipation devices 4, and a plurality of high-strength bolt groups 5.

[0049] Specifically, the steel column 1 has a cantilever beam 2, the length of which is determined according to the force analysis and design. The cantilever beams 2 on the steel columns 1 on both sides are butt-connected with the two ends of the steel beam 3 to avoid the direct connection between the steel beam 3 and the steel column 1, so that the force at the beam-column node is more reasonable. The cantilever beam 2 is connected to the steel beam 3 through a chain-rod buckling restraint step-by-step energy dissipation device 4, forming an assembled beam-column connection node with an additional chain-rod buckling restraint step-by-step energy dissipation device.

[0050] In the assembled beam-column connection node with an additional chain-rod type buckling restraint staged energy dissipation device, a gap of 15 to 25 mm is reserved at the joint between the steel beam 3 and the cantilever beam 2. When subjected to an earthquake, the cantilever beam end rotates with the flange as the rotation center, which facilitates deformation energy dissipation at the node. It is also equivalent to making a small weakening here, which is convenient for controlling the location of plastic damage and avoiding local compressive stress when the steel beam 3 and the cantilever beam 2 rotate relative to each other, thereby preventing local compression from damaging the main structure.

[0051] In order to prevent sudden changes in force flow, the cantilever beam 2 should be provided with an arc weakening section at a distance of 200 to 250 mm from the steel column 1 so that the width of the cantilever beam 2 can be steadily weakened to the width of the steel beam 3.

[0052] In the utility model, the steel column 1, the cantilever beam 2 and the steel beam 3 all adopt an I-shaped / H-shaped cross-section form, so as to facilitate the arrangement of the chain-rod type buckling restraint step-by-step energy dissipation device 4.

[0053] Steel column web stiffening plates 11 are arranged on both sides of the web of the steel column 1 corresponding to the upper and lower flanges of the cantilever beam 2. The two steel column web stiffening plates 11 are flush with the upper and lower flanges of the cantilever beam 2 and are welded to the web and left and right flanges of the steel column 1 to strengthen the upper and lower flanges of the cantilever beam 2 near the column end.

[0054] See also Figure 1-3 , two sets of chain-rod type buckling restraint staged energy dissipation devices 4 are used to connect the cantilever beam 2 and the steel beam 3 on the steel column 1, and are connected to the two sides of the web in opposition through a high-strength bolt group 5 at the joint between the cantilever beam 2 and the steel beam 3. It is easy to understand that the two sets of chain-rod type buckling restraint staged energy dissipation devices 4 provide buckling restraint + energy dissipation, and are mainly considered as buckling restraint components. Under small and medium earthquakes, the chain rod can effectively prevent the flange cover with ear plates from buckling prematurely. Under large and super-large earthquakes, after the chain rod breaks and exits work, the crescent-shaped ear plate can also play an anti-buckling role. At the same time, it also has the function of damping energy dissipation, which is used for graded energy dissipation under earthquake action. After the earthquake action ends, the graded energy dissipation function can be restored by removing the bolts and replacing the energy dissipation components. The specific energy dissipation mechanism will be elaborated in detail in the following text in conjunction with the specific structure.

[0055] like Figure 2 Bolt holes are opened corresponding to the webs and upper and lower flanges of the two sets of chain-rod type buckling restrained step-by-step energy dissipation devices 4 and the cantilever beam 2 and the steel beam 3. The two sets of chain-rod type buckling restrained step-by-step energy dissipation devices 4 are connected to the two sides of the web at the joint of the cantilever beam 2 and the steel beam 3 through high-strength bolt groups 5, and are symmetrically arranged on both sides of the web, between the upper and lower flanges. In this way, the connection and fixation of the steel beam 3 and the cantilever beam 2 are achieved with the help of the two sets of chain-rod type buckling restrained step-by-step energy dissipation devices 4.

[0056] In a specific embodiment, see Figure 4 The two sets of chain-rod type buckling restrained step-by-step energy dissipation devices 4 have the same structure. Each set of chain-rod type buckling restrained step-by-step energy dissipation devices 4 includes: two flange cover plates 6 with ear plates, two web connecting plates 7 with crescent-shaped ear plates, two pin-shaft shear damping chain rods 8, and a high-strength bolt group 5.

[0057] Specifically, the flange cover plate 6 with ear plates is, for example, made of a strip steel plate, the length of which is determined according to the design requirements, and includes a middle weakened area 61, two end opening areas 62 and ear plates 63. The middle weakened area 61 is, for example, formed by opening notches on both sides of the middle section of the strip steel plate to form a dog-bone weakening. A plurality of ear plates 63 are equidistantly arranged in the middle weakened area 61. The ear plates 63 are ordinary ear plates, which are shown in a triangular shape in the figure. The ear plates 63 can be welded to the middle weakened area 61 in advance or formed integrally with the cover plate. While ensuring that the dog-bone weakened flange cover plate 6 can play a due buckling restraint role, the number of ear plates 63 can be flexibly designed, for example, two, three or more. Three is preferred in the embodiment of the utility model.

[0058] The opening areas 62 at both ends are preset with multiple bolt holes, which are arranged in a line. The upper and lower flanges at the joint of the cantilever beam 2 and the steel beam 3 are provided with bolt holes correspondingly. The two flange cover plates 6 with ear plates are respectively connected to the inner sides of the upper and lower flanges at the joint of the cantilever beam 2 and the steel beam 3 through high-strength bolt groups 5. The number of bolt holes can be flexibly designed according to needs to ensure the connection strength. In the embodiment of the utility model, it is preferred that four bolt holes are provided at each end of the opening areas 62 at both ends.

[0059] The web connecting plate 7 with crescent-shaped ear plates includes a web connecting plate body 71 and a crescent-shaped ear plate 72. The web connecting plate body 71 is, for example, a square steel plate. At least two groups of bolt holes are symmetrically opened on the square steel plate, and each group has multiple bolt holes. The figure shows that two groups of bolt holes are opened on the left and right, and each group has two bolt holes on the upper and lower sides. The webs of the steel beam 3 and the cantilever beam 2 are respectively provided with bolt holes. The two web connecting plate bodies 71 are arranged up and down. One group of the two groups of bolt holes on each web connecting plate body 71 is connected and fixed to the web of the steel beam 3 by a high-strength bolt group 5, and the other group is connected and fixed to the web of the cantilever beam 2 by a high-strength bolt group 5. The two web connecting plate bodies 71 are not connected, and can be separated by a small gap to prevent the structural body from being damaged due to local compression when the steel beam 3 and the cantilever beam 2 rotate relative to each other. Figure 3 shown.

[0060] The crescent-shaped ear plate 72 is arranged on one side edge of the web connecting plate body 71. Specifically, the crescent-shaped ear plate 72 on the upper web connecting plate body 71 is welded on its upper side edge, and the crescent-shaped ear plate 72 on the lower web connecting plate body 71 is welded on its lower side edge, so as to facilitate one-to-one matching and connection with the ear plate 63 on the corresponding flange cover plate 6 with ear plate.

[0061] Multiple crescent-shaped ear plates 72 are arranged at equal intervals. Under the premise of ensuring that the dog-bone weakened flange cover plate 6 can be properly restrained from bending, the number of crescent-shaped ear plates 72 can be flexibly designed, such as two, three or more. Of course, the number should be consistent with the number of ear plates 63. Three is preferred in this embodiment.

[0062] Correspondingly, two pin-shaft shear damping chain rods 8 are provided in the utility model, and the two pin-shaft shear damping chain rods 8 are respectively used to connect the upper and lower web connecting plates 7 with crescent-shaped ear plates and the flange cover plates 6 with ear plates. Specifically, one of the pin-shaft shear damping chain rods 8 passes through the ear plate 63 of the flange cover plate 6 with ear plates on the lower flange and the through hole on the crescent-shaped ear plate 72 of the corresponding web connecting plate 7 with crescent-shaped ear plates, and the other pin-shaft shear damping chain rod 8 passes through the ear plate 63 of the flange cover plate 6 with ear plates on the upper flange and the through hole on the crescent-shaped ear plate 72 of the corresponding web connecting plate 7 with crescent-shaped ear plates, so as to be connected and fixed.

[0063] In the utility model, the opening of the ear plate 63 is a circular hole, and the opening of the crescent-shaped ear plate 72 is an oblong hole. The flange cover plate 6 with the ear plate is connected to the web connecting plate 7 with the crescent-shaped ear plate through the pin shear damping chain rod 8 that passes through the ear plate 63 and the crescent-shaped ear plate 72. Under the action of an earthquake, the flange cover plate 6 with the ear plate on the compression side undergoes buckling deformation to dissipate energy, and the plate bulges upward without hitting or slightly hitting the pin shear damping chain rod 8. The pin shear damping chain rod 8 slides in the oblong hole and is finally limited at the edge of the oblong hole. At this time, the chain-rod type buckling constraint stepped energy dissipation device 4 can effectively limit the out-of-plane deformation of the flange cover plate 6 with the ear plate on the compression side, thereby avoiding its premature buckling.

[0064] It should be noted that the crescent-shaped ear plate 72 is used as a connecting link and is used to provide buckling restraint on the dog-bone weakened flange cover plate 6 when the link breaks in the later stage. The crescent shape is only for the convenience of description. The crescent shape is a preferred form, and it can also be a long triangular hole plate. The specific parameters of the ear plate 63, the crescent-shaped ear plate 72 and the pin shear damping chain rod 8 should be determined according to the actual working conditions to ensure that the chain-type buckling restraint step-by-step energy dissipation device 4 can achieve elastic work under small and medium earthquakes, and enter plasticity under large and super-large earthquakes to achieve the step-by-step anti-buckling function.

[0065] The assembled beam-column connection node with the additional link-rod type buckling restraint step-by-step energy dissipation device provided by the utility model, under the action of an earthquake, the beam-column node is deformed, and during small and medium earthquakes, the flange cover plate 6 with the ear plate on the compression side buckles and deforms to dissipate energy, and under the action of tension or pressure, the middle weakened zone 61 produces plastic deformation to dissipate part of the energy, and the cover plate bulges upward without hitting or slightly hitting the pin shear damping chain rod 8, which is the first energy dissipation stage; during large and super-large earthquakes, the flange cover plate 6 with the ear plate on the compression side continues to bulge upward to hit the pin shear damping chain rod 8, and the pin shear damping chain rod 8 produces plastic deformation to dissipate part of the energy under the action of shear force, and when the shear force exceeds the bearing capacity of the pin shear damping chain rod 8, the pin shear damping chain rod 8 breaks, and the crescent-shaped ear plate 72 of the web connecting plate 7 with the crescent-shaped ear plate hits the flange cover plate 6 with the ear plate on the compression side, and can continue to be used as an anti-buckling member, which is the second energy dissipation stage.

[0066] Continue to see Figure 5-7 The utility model provides another assembled beam-column connection node with an additional link-type buckling restraint step-by-step energy dissipation device, which also includes: a steel column 1, a steel beam 3, two sets of link-type buckling restraint step-by-step energy dissipation devices 4, and a plurality of high-strength bolt groups 5. In addition, the two sets of link-type buckling restraint step-by-step energy dissipation devices 4 have the same structure, and each set of link-type buckling restraint step-by-step energy dissipation devices 4 includes: two flange cover plates 6 with ear plates, two web connection plates 7 with crescent-shaped ear plates, two pin-shaft shear damping link rods 8, and a high-strength bolt group 5.

[0067] The difference is that the two flange covers 6 with ears are dog-bone weakened SMA flange covers with ears, and the cantilever beam 2 and the steel beam 3 are tightly connected, so that the SMA can provide a better self-reset effect. The other structures are the same. By using the SMA flange cover, the SMA can provide a reliable self-reset force, which can effectively reduce the residual deformation of the beam-column node after the earthquake. In addition, the SMA itself can dissipate part of the energy, and the reasonably designed pin shear damping chain rod dissipates part of the energy through shear deformation. The two energy dissipation elements can dissipate energy in a coordinated manner, which improves the reliability of the energy dissipation mechanism of the utility model.

[0068] In addition, the additional chain-rod buckling-restrained SMA self-resetting energy dissipation device provides a "fuse" function, which can effectively prevent the flange cover with ear plates from producing large out-of-plane deformation under large and extremely large earthquakes, causing the SMA to enter the plastic yield stage and deteriorate the energy dissipation and self-resetting performance.

[0069] In the dog-bone weakened SMA flange cover with ear plates, the pin shear damping chain rod should use steel with a low yield point. The material properties of other components should be determined according to the specific working conditions and their yield points should not be lower than the steel used for the pin shear damping chain rod. In this way, the pin shear damping chain rod occupies a secondary position in the energy dissipation system to ensure that it withdraws from work before the cover fails. After its fracture, the anti-buckling function is taken over by the ear plate, and the ear plate supports the weakened section of the cover plate, further playing a certain anti-buckling function.

[0070] The chain-rod type buckling restraint step-by-step energy dissipation device 4 of the utility model is symmetrically arranged at both ends of the same frame beam, and can be arranged in a single layer or multiple layers in the frame system, which can comprehensively and systematically improve the bearing capacity of the steel frame system and has good assemblability.

[0071] When irreversible plastic deformation occurs in the chain-bar buckling restrained staged energy dissipation device 4 after an earthquake, the damage of the chain-bar buckling restrained staged energy dissipation device 4 should be evaluated first, and then the connecting bolts should be removed for replacement, the connection between the chain-bar buckling restrained staged energy dissipation device 4 and the main structure should be released, and the chain-bar buckling restrained staged energy dissipation device 4 should be replaced as a whole. The concept of restorable function development is realized by using easily replaceable energy dissipation components, which has good earthquake resistance and is widely applicable to light industrial plants, high-rise building systems, etc.

[0072] 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 of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

[0073] Although several specific implementation details are included in the above discussion, these should not be interpreted as limiting the scope of the present invention. Certain features described in the context of a separate embodiment may also be implemented in a single implementation in combination. On the contrary, the various features described in the context of a single implementation may also be implemented in multiple implementations individually or in any suitable sub-combination.

Claims

1. An assembled beam-column connection node with an additional link-type buckling restraint staged energy dissipation device, characterized in that: include: Steel columns with cantilever beams on them, both of which are I- / H-shaped; The steel beam is I-shaped / H-shaped, and its two ends are butt-connected to the cantilever beams on the steel columns on both sides; Two sets of chain-rod type buckling restrained step-by-step energy dissipation devices are connected to both sides of the web by bolts at the joint between the steel beam and the cantilever beam, and are used to connect the steel beam and the cantilever beam, and each set of the chain-rod type buckling restrained step-by-step energy dissipation devices includes: Two flange cover plates with ear plates are respectively connected to the inner sides of the upper and lower flanges at the joints between the steel beam and the cantilever beam through high-strength bolt groups; Two web connecting plates with crescent-shaped ear plates are respectively connected to the upper and lower parts of the web at the joint between the steel beam and the cantilever beam through a group of high-strength bolts; Two pin-shaft shear damping chain rods respectively pass through the ear plate and the crescent-shaped ear plate to connect the flange cover plate with the ear plate and the web connecting plate with the crescent-shaped ear plate.

2. The beam-column connection node according to claim 1, characterized in that: A gap is reserved at the joint between the steel beam and the cantilever beam.

3. The beam-column connection node according to claim 2, characterized in that: The gap size is 15 to 25 mm.

4. The beam-column connection node according to claim 1, characterized in that: The flange cover plate with ear plates is made of strip steel plates, and dog-bone weakening notches are provided on both sides.

5. The beam-column connection node according to claim 4, characterized in that: The flange cover plate with ear plates comprises: A middle weakened area, wherein the middle weakened area is formed by opening notches on both sides of the middle section of the cover plate to form a dog bone weakening; Ear plates, a plurality of ear plates are arranged equidistantly in the middle weakened area; The two end opening areas each have a plurality of bolt holes, one end of which is connected and fixed to the flange of the steel beam by a high-strength bolt group, and the other end of which is connected and fixed to the flange of the cantilever beam by a high-strength bolt group.

6. The beam-column connection node according to claim 5, characterized in that: The ear plate openings of the flange cover plate with ear plates are round holes.

7. The beam-column connection node according to claim 1, characterized in that: The web connecting plate with crescent-shaped ear plates comprises: A web connecting plate body, wherein the web connecting plate body is provided with at least two groups of bolt holes symmetrically, wherein one group of bolt holes is connected and fixed to the web of the steel beam through a high-strength bolt group, and the other group of bolt holes is connected and fixed to the web of the cantilever beam through a high-strength bolt group; A plurality of crescent-shaped ear plates are equidistantly arranged on one side of the web connecting plate body close to the flange cover plate with the ear plates, and correspond one to one with the ear plates.

8. The beam-column connection node according to claim 7, characterized in that: The crescent-shaped ear plate opening of the web connecting plate with the crescent-shaped ear plate is an oblong hole.

9. The beam-column connection node according to claim 1, characterized in that: The flange cover plate with ear plates is an SMA cover plate.

10. The beam-column connection node according to claim 9, characterized in that: The butt joint between the steel beam and the cantilever beam is tightened.

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