C-type double-link buckling-restrained step-by-step energy-dissipating assembled beam-to-column connection node

Abstract

The present invention proposes a C-type double-chain buckling-restrained stepped energy-dissipating assembled beam-to-column connection node, comprising: a steel column with a cantilever beam on it; a steel beam, both ends of which are butt-connected to the cantilever beams on the steel columns on both sides, and a gap is reserved at the butt joint; two sets of C-type double-chain buckling-restrained stepped energy-dissipating devices, each set comprising: two strip 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 through a high-strength bolt group; two L-shaped web connecting plates with crescent-shaped ear plates, which are respectively connected to the web at the butt joint of the steel beam and the cantilever beam through a high-strength bolt group, and the two L-shaped web connecting plates with crescent-shaped ear plates are mutually connected through a high-strength bolt group; a pin-shaft shear damping chain rod, which passes through the ear plate and the crescent-shaped ear plate to connect the strip flange cover plate with the ear plate and the L-shaped web connecting plate with the crescent-shaped ear plate. The present invention is designed based on the concept of centralized control of plastic damage and replaceable energy-absorbing components. All plastic damage can be centralized and controlled on the energy-absorbing components, effectively protecting the main structure from damage. After an earthquake, only the energy-absorbing components need to be replaced to achieve continuous structural function of the building.

Description

Technical Field

[0001] The present invention relates to the technical field of building structures, in particular to prefabricated assembled structures, and in particular to a C-shaped double-chain buckling-restrained stepped energy-dissipating assembled beam-column connection node. 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 present invention provides a C-type double-link buckling-restrained stepped energy-dissipating assembled beam-column connection node, which aims to solve the problems of easy buckling of dog-bone weakening plates in the same type of beam-column node devices and easy premature failure of traditional web connection plates, and to reduce the adverse effects of the plastic hinges at the beam ends on the beam-column node domain.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] The present invention provides a C-type double-chain buckling-restrained stepped energy-dissipating assembled beam-column connection node, comprising: a steel column with a cantilever beam on it, both of which are I-shaped / H-shaped; an I-shaped / H-shaped steel beam, both ends of which are butt-connected to the cantilever beams on the steel columns on both sides, and a gap is reserved at the butt joint; two sets of C-type double-chain buckling-restrained stepped energy-dissipating devices are connected to the two sides of the web by bolts at the butt joint of the steel beam and the cantilever beam, and are used to connect the steel beam and the cantilever beam, and each set of the C-type double-chain buckling-restrained stepped energy-dissipating devices is connected to the two sides of the web by bolts at the butt joint of ... The energy dissipation devices include: two strip flange cover plates with ear plates, which are respectively connected to the inner sides of the upper and lower flanges at the joints of the steel beam and the cantilever beam through high-strength bolt groups; two L-shaped web connecting plates with crescent-shaped ear plates, which are respectively connected to the webs at the joints of the steel beam and the cantilever beam through high-strength bolt groups, and the two L-shaped web connecting plates with crescent-shaped ear plates are mutually connected through high-strength bolt groups; a pin-shaft shear damping chain rod passes through the ear plates and the crescent-shaped ear plates to connect the strip flange cover plates with ear plates and the L-shaped web connecting plates with crescent-shaped ear plates. The beam-column connection node of the present invention is designed based on the concept of centralized control of plastic damage and replaceable energy dissipation elements. All plastic damage can be centralized and controlled on the energy dissipation elements, and the main structure will not produce irreversible plastic deformation, which effectively protects the main structure from damage. The C-type double-chain buckling-restrained staged energy dissipation device can effectively prevent the strip flange cover with ear plates on the compression side from buckling prematurely during an earthquake, and achieve staged energy dissipation under small, moderate, large and super-large earthquakes.

[0008] In some embodiments, the gap size is 15-25 mm.

[0009] In some embodiments, the strip flange cover plate with ear plates is made of ordinary strip steel plates.

[0010] In some embodiments, the strip flange cover 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 arranged equidistantly in the middle weakened area; and two end opening areas, wherein a plurality of bolt holes are provided in the two end opening areas, wherein one end is connected and fixed to the flange of the cantilever beam by a high-strength bolt group, and the other end is connected and fixed to the flange of the steel beam by a high-strength bolt group. The strip flange cover with ear plates provided by the present invention can undergo buckling deformation to dissipate part of the energy when the node is deformed, and can further continue to be used as an anti-buckling member.

[0011] In some embodiments, the ear plate openings of the strip flange cover plate with ear plates are circular holes.

[0012] In some embodiments, four ear plates of the strip flange cover plate with ear plates are arranged equidistantly.

[0013] In some embodiments, the L-shaped web connecting plate with crescent-shaped ear plate comprises: a first limb, wherein the first limb of one L-shaped web connecting plate with crescent-shaped ear plate is connected and fixed to the web of the cantilever beam by a high-strength bolt group, and the first limb of another L-shaped web connecting plate with crescent-shaped ear plate is connected and fixed to the web of the steel beam by a high-strength bolt group, and a plurality of crescent-shaped ear plates are arranged equidistantly at the upper and lower ends of the first limb; a second limb, wherein the second limb of one L-shaped web connecting plate with crescent-shaped ear plate is connected to the second limb of another L-shaped web connecting plate with crescent-shaped ear plate by a high-strength bolt group. The present invention provides a method that can effectively reduce the problem of excessive shear stress, and prevent the web connecting plate from losing its bearing capacity prematurely due to excessive shear force under moderate and large earthquakes, thereby causing the entire beam-column node to fail.

[0014] In some embodiments, the crescent-shaped ear plate opening of the L-shaped web connecting plate with crescent-shaped ear plate is an oblong hole.

[0015] In some embodiments, two crescent-shaped ear plates of the L-shaped web connecting plate with crescent-shaped ear plates are equidistantly arranged at the upper and lower ends of the first limb.

[0016] In some embodiments, four pin-shaft shear damping chain rods are provided, which are arranged in groups of two, respectively passing through the multiple crescent-shaped ear plates at the upper and lower ends of the first limb of two L-shaped web connecting plates with crescent-shaped ear plates and the corresponding ear plates on the two strip flange cover plates with ear plates.

[0017] The beneficial effects of the present invention compared with the prior art are as follows: the C-shaped double-link buckling-restrained step-by-step energy-dissipating assembled beam-column connection node provided by the present invention moves the plastic hinge outwards away from the vertical load-bearing components, and the connection device connects the H-shaped steel column and the steel beam welded with the cantilever beam. The cantilever beam is appropriately strengthened to prevent the cantilever beam from being damaged earlier than the connection area, and then the plastic hinge is moved outwards and controlled near the connection device to avoid causing damage to the vertical load-bearing components. Specifically, it can at least bring the following beneficial effects:

[0018] 1. The present invention 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 will not produce 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.

[0019] 2. The C-type double-chain buckling restraint staged energy dissipation device provided in the present invention can effectively prevent the strip flange cover plate with ear plates on the compression side from buckling prematurely during an earthquake. If the strip flange cover plate with ear plates on the compression side produces elastic buckling under small or moderate earthquakes, the weakened section bulges upward without hitting or slightly hitting the pin shear damping chain rod, and the pin shear damping chain rod slides in the oblong hole and is finally limited at the edge of the oblong hole. At this time, the shear force on the pin shear damping chain rod is not large and is still in the elastic stage. The C-type double-chain buckling restraint staged energy dissipation device can effectively limit the out-of-plane deformation of the strip flange cover plate with ear plates on the compression side, thereby avoiding further development of elastic buckling. At this time, the weakened section will not enter the plastic stage, which is the first energy dissipation stage. Under large and extremely large earthquakes, the strip flange cover with ear plates on the compression side bulges upward and hits the pin shear damping chain rod. The pin shear damping chain rod deforms and consumes energy under the action of shear force until the shear force exceeds its bearing capacity, and the pin shear damping chain rod breaks. After the break, the crescent-shaped ear plate supports the strip flange cover with ear plates on the compression side, and the weakened section enters the plastic stage and undergoes plastic buckling. It can continue to be used as an anti-buckling component, thereby limiting the further development of its out-of-plane bulging, which is the second energy dissipation stage, thus achieving step-by-step energy dissipation.

[0020] 3. The present invention uses an L-shaped web connecting plate to replace the traditional rectangular web connecting plate, which can effectively reduce the problem of excessive shear stress in the traditional rectangular web connecting plate. Under moderate or severe earthquakes, the web connecting plate is prone to lose its bearing capacity prematurely due to excessive shear force, which in turn causes the entire beam-column node to fail, affecting the overall safety of the structure. The high-strength bolts connecting the two L-shaped web connecting plates are in a state of tension shear or compression shear when the cantilever beam and the steel beam produce a relative rotation angle. By applying a bolt preload, the two L-shaped web connecting plates are prevented from being pulled apart prematurely under moderate or severe earthquakes, causing them to lose their bearing capacity.

[0021] 4. The present invention 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 present invention 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.

[0022] 5. All welding processes of the present invention can be completed in the prefabrication factory, which produces standard "modules". The construction site only needs to locate the reserved bolt holes and assemble the "modules" with high-strength bolts to complete the structural installation, which has the characteristics of high modularization. This "building blocks" construction concept reduces the use of labor and reduces the difficulty of construction, thereby effectively shortening the construction period.

[0023] 6. The present invention can be applied to a single-story building, 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.

[0024] 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

[0025] 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.

[0026] 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.

[0027] Figure 1 A three-dimensional diagram of a C-type double-link buckling-restrained step-by-step energy-dissipating assembled beam-column connection node;

[0028] Figure 2 It is a decomposition diagram of a C-type double-link buckling-restrained step-by-step energy-dissipating assembled beam-column connection node;

[0029] Figure 3 It is a front view of a C-type double-link buckling-restrained stepped energy-dissipating assembled beam-column connection node;

[0030] Figure 4 This is a decomposition diagram of a C-type double-chain buckling-restrained step-by-step energy dissipation device;

[0031] Figure 5 This is a three-dimensional diagram of another C-type double-link buckling-restrained stepped energy-dissipating prefabricated beam-column connection node.

[0032] Markings in the figure:

[0033] 1-steel column, 11-steel column web stiffener;

[0034] 2-Cantilever beam;

[0035] 3- Steel beam;

[0036] 4-C type double-chain buckling restrained step-by-step energy dissipation device;

[0037] 5-High-strength bolt group;

[0038] 6- strip flange cover with ear plate, 61- middle weakened area, 62- opening areas at both ends, 63- ear plate;

[0039] 7-L-shaped web connecting plate with crescent-shaped ear plate, 71-first limb, 72-second limb, 73-crescent-shaped ear plate;

[0040] 8-pin shear damping chain rod.

[0041] In the various drawings, the same or corresponding reference numerals represent the same or corresponding parts. DETAILED DESCRIPTION

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] like Figure 1-3 As shown, a C-type double-link buckling-restrained stepped energy-dissipating assembled beam-to-column connection node provided by the present invention mainly comprises: a steel column 1, a steel beam 3, two sets of C-type double-link buckling-restrained stepped energy-dissipating devices 4, and a plurality of high-strength bolt groups 5.

[0048] Specifically, the steel column 1 is provided with 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 of the steel beam 3 with the steel column 1, so that the force at the beam-column node is more reasonable. To prevent sudden changes in force flow, the cantilever beam 2 can 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 is steadily weakened to the width of the steel beam 3. The cantilever beam 2 is connected to the steel beam 3 through a C-type double-chain buckling restraint step-by-step energy dissipation device 4, forming a C-type double-chain buckling restraint step-by-step energy dissipation assembled beam-column connection node.

[0049] In the C-type double-link buckling-restrained stepped energy-dissipating assembled beam-column connection node, a gap of 15 to 25 mm is reserved at the joint between the steel beam 3 and the cantilever beam 2. This is convenient for deformation energy dissipation at the node, which is equivalent to making a small weakening here, making it convenient to control the location of plastic damage and avoid local compressive stress when the steel beam 3 and the cantilever beam 2 rotate relative to each other, thereby damaging the main structure.

[0050] In the present invention, 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 C-shaped double-chain buckling restrained staged energy dissipation device 4.

[0051] 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.

[0052] See also Figure 1-3 , two sets of C-type double-chain buckling-restrained 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 by high-strength bolt groups 5 at the joints between the steel beam 3 and the cantilever beam 2. It is easy to understand that the two sets of C-type double-chain buckling-restrained staged energy dissipation devices 4 provide buckling restraint + energy dissipation, which are mainly considered as buckling restraint components, and also have damping energy dissipation functions, which are 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 combination with the specific structure.

[0053] like Figure 2 Two sets of C-type double-link buckling-restrained stepped energy dissipation devices 4 are provided with bolt holes corresponding to the webs and upper and lower flanges of the cantilever beam 2 and the steel beam 3. The two sets of C-type double-link buckling-restrained stepped energy dissipation devices 4 are connected to both sides of the web at the joint between the steel beam 3 and the cantilever beam 2 through high-strength bolt groups 5, and are symmetrically arranged on both sides of the web. In this way, the connection and fixation of the steel beam 3 and the cantilever beam 2 are achieved with the help of two sets of C-type double-link buckling-restrained stepped energy dissipation devices 4.

[0054] In a specific embodiment, see Figure 4 The two sets of C-type double-chain buckling restrained staged energy dissipation devices 4 have the same structure. Each set of C-type double-chain buckling restrained staged energy dissipation devices 4 includes: two strip flange cover plates 6 with ear plates, two L-shaped web connecting plates 7 with crescent-shaped ear plates, a pin shear damping chain rod 8, and a high-strength bolt group 5.

[0055] Specifically, the strip flange cover plate 6 with ear plates is, for example, made of strip steel plates, the length of which is determined according to 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 in advance to the middle weakened area 61 or formed integrally with the cover plate. While ensuring that the strip flange cover plate 6 with ear plates can play a due buckling restraint role, the number of ear plates 63 can be flexibly designed, for example, two, four or more. The number of ear plates 63 should be an even number to match the two L-shaped web connecting plates 7 with crescent-shaped ear plates. Four are preferred in the embodiment of the present invention.

[0056] 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 steel beam 3 and the cantilever beam 2 are provided with bolt holes correspondingly. The two strip 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 steel beam 3 and the cantilever beam 2 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 present invention, it is preferred that four bolt holes are provided at each end of the opening areas 62 at both ends.

[0057] Different from the traditional practice, the web connecting plate of the present invention adopts an L-shaped web connecting plate 7 with a crescent-shaped ear plate. The two L-shaped web connecting plates 7 with crescent-shaped ear plates are symmetrically distributed on the left and right, and are respectively connected to the webs of the steel beam 3 and the cantilever beam 2 at the joint. Obviously, the L-shaped structure has a near-web limb and a non-near-web limb. The near-web limbs of the two L-shaped web connecting plates 7 with crescent-shaped ear plates are respectively connected to the webs at the joints of the steel beam 3 and the cantilever beam 2 through a high-strength bolt group 5. At the same time, the non-near-web limbs of the two L-shaped web connecting plates 7 with crescent-shaped ear plates are mutually connected and fixed through a high-strength bolt group 5, and the two L-shaped web connecting plates 7 with crescent-shaped ear plates are connected to two strip flange cover plates 6 with ear plates, forming a C-shaped double-chain buckling restrained step-by-step energy dissipation device 4.

[0058] Specifically, the L-shaped web connecting plate 7 with a crescent-shaped ear plate includes a first limb 71, a second limb 72 and a crescent-shaped ear plate 73, wherein one of the L-shaped web connecting plates 7 with a crescent-shaped ear plate is arranged on one side of the cantilever beam 2 at the joint, and its first limb 71 is connected and fixed to the web of the cantilever beam 2 by a high-strength bolt group 5, and the other L-shaped web connecting plate 7 with a crescent-shaped ear plate is arranged on one side of the steel beam 3 at the joint, and its first limb 71 is connected and fixed to the web of the steel beam 3 by a high-strength bolt group 5, and bolt holes are correspondingly opened on the webs of the steel beam 3 and the cantilever beam 2, the two L-shaped web connecting plates 7 with crescent-shaped ear plates are open and back to back, and the two second limbs 72 are back-to-back, and the high-strength bolt group 5 passes through the two second limbs 72 to connect and fix the L-shaped web connecting plates 7 with crescent-shaped ear plates to each other.

[0059] The crescent-shaped ear plates 73 are arranged at the upper and lower ends of the first limb 71, and multiple crescent-shaped ear plates are arranged equidistantly. Under the premise of ensuring that the two strip flange cover plates 6 with ear plates can have the due buckling restraint effect, the number of crescent-shaped ear plates 73 can be flexibly designed, such as two, three or more. Of course, it should be consistent with the number of ear plates 63. Two is preferred in this embodiment.

[0060] Correspondingly, four pin-shaft shear damping chain rods 8 are provided in the present invention, and the four pin-shaft shear damping chain rods 8 are arranged in groups of two, and are respectively used to connect one of the L-shaped web connecting plates 7 with crescent-shaped ear plates and the upper and lower strip flange cover plates 6 with ear plates. Specifically, one pin-shaft shear damping chain rod 8 passes through the two crescent-shaped ear plates 73 at the upper end of the first limb 71 of the L-shaped web connecting plate 7 with crescent-shaped ear plates and two of the four corresponding ear plates 63 on the upper strip flange cover plate 6 with ear plates, and the other pin-shaft shear damping chain rod 8 passes through the two crescent-shaped ear plates 73 at the lower end of the first limb 71 of the L-shaped web connecting plate 7 with crescent-shaped ear plates and two of the four corresponding ear plates 63 on the lower strip flange cover plate 6 with ear plates. The other L-shaped web connecting plate 7 with crescent-shaped ear plates is connected in the same manner as the strip flange cover plate 6 with ear plates.

[0061] In the present invention, the opening of the ear plate 63 is a circular hole, and the opening of the crescent-shaped ear plate 73 is an oblong hole. The strip flange cover plate 6 with the ear plate is connected to the L-shaped 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 73. Under the action of an earthquake, the strip 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 shear force on the pin shear damping chain rod is not large and is still in the elastic stage. The C-type double-chain buckling constraint stepped energy dissipation device 4 can effectively limit the out-of-plane deformation of the strip flange cover plate 6 with the ear plate on the compression side, thereby avoiding its premature buckling.

[0062] It should be noted that the crescent-shaped ear plate 73 is used as a connecting chain rod and is used to provide buckling restraint on the strip flange cover plate 6 with ear plates when the chain rod breaks in the later stage. The crescent shape is only for the convenience of description. The crescent shape is a better form, and it can also be a long triangular hole plate. The specific parameters of the ear plate 63, the crescent-shaped ear plate 73 and the pin shear damping chain rod 8 should be determined according to the actual working conditions to ensure that the C-type double-chain 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.

[0063] Through the C-type double-chain buckling restraint step-by-step energy dissipation assembled beam-column connection node provided by the present invention, under the action of an earthquake, the beam-column node deforms. During small and medium earthquakes, the strip flange cover plate 6 with ear plates on the compression side undergoes buckling deformation and energy dissipation. Under the action of tension or pressure, the middle weakened area 61 produces plastic deformation to dissipate part of the energy. 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 strip flange cover plate 6 with ear plates on the compression side continues to bulge upward. The bend hits the pin shear damping chain rod 8, and the pin shear damping chain rod 8 produces deformation and energy consumption under the action of shear force. When the shear force exceeds the bearing capacity of the pin shear damping chain rod 8, the pin shear damping chain rod 8 breaks. After breaking, the crescent-shaped ear plate 73 of the L-shaped web connecting plate 7 with crescent-shaped ear plate hits the strip flange cover plate 6 with ear plate on the compression side, and the weakened section enters the plastic stage and undergoes plastic buckling. It can continue to be used as an anti-buckling component, thereby limiting the further development of its out-of-plane bulging, which is the second energy consumption stage.

[0064] Continue to see Figure 5 The present invention provides another C-type double-link buckling-restrained stepped energy-dissipating assembled beam-column connection node, which also includes: a steel column 1, a steel beam 3, two sets of C-type double-link buckling-restrained stepped energy-dissipating devices 4, and a plurality of high-strength bolt groups 5.

[0065] The difference is that the two strip flange covers 6 with ear plates are SMA steel plates, 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 synergistically, which improves the reliability of the energy dissipation mechanism of the present invention.

[0066] In addition, the pin-shaft shear damping chain rod combined with the SMA self-resetting energy dissipation device provides a "fuse" function, which can effectively prevent the strip 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 degrade the energy dissipation and self-resetting performance.

[0067] In the SMA flange cover, the pin shear damping chain rod should be made of 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, which supports the weakened section of the cover plate and further plays a certain anti-buckling function.

[0068] The C-shaped double-link buckling-restrained step-by-step energy dissipation device 4 of the present invention 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.

[0069] When irreversible plastic deformation occurs in the C-type double-link buckling-restrained staged energy dissipation device 4 after an earthquake, the damage of the C-type double-link 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 C-type double-link buckling-restrained staged energy dissipation device 4 and the main structure should be released, and the C-type double-link 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, with good earthquake resistance, and is widely applicable to light industrial plants, high-rise building systems, etc.

[0070] 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 variations 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.

[0071] Although several specific implementation details are included in the above discussion, these should not be construed as limiting the scope of the present invention. Certain features described in the context of separate embodiments 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. A C-type double-link buckling-restrained stepped energy-dissipating assembled beam-column connection node, 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 with the cantilever beams on the steel columns on both sides, and a gap is reserved at the butt joint; Two sets of C-type double-chain buckling-restrained staged 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 C-type double-chain buckling-restrained staged energy dissipation devices includes: Two strip 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; the strip flange cover plate with ear plates comprises a middle weakened area and ear plates, the middle weakened area is formed by opening notches on both sides of the middle section of the cover plate to form dog bone weakening, and a plurality of ear plates are arranged equidistantly in the middle weakened area; Two L-shaped web connecting plates with crescent-shaped ear plates are respectively connected to the web at the joint of the steel beam and the cantilever beam through a high-strength bolt group, and the two L-shaped web connecting plates with crescent-shaped ear plates are connected to each other through a high-strength bolt group; the crescent-shaped ear plate opening of the L-shaped web connecting plate with crescent-shaped ear plates is an oblong hole; The pin-shaft shear damping chain rod passes through the ear plate and the crescent-shaped ear plate to connect the strip flange cover plate with the ear plate and the L-shaped web connecting plate with the crescent-shaped ear plate.

2. The beam-column connection node according to claim 1, characterized in that: The gap size is 15~25mm.

3. The beam-column connection node according to claim 1, characterized in that: The strip-shaped flange cover plate with ear plates is made of ordinary strip-shaped steel plates.

4. The beam-column connection node according to claim 1, characterized in that: The strip flange cover plate with ear plates also includes: 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 cantilever beam by a high-strength bolt group, and the other end of which is connected and fixed to the flange of the steel beam by a high-strength bolt group.

5. The beam-column connection node according to claim 1, characterized in that: The ear plate openings of the strip-shaped flange cover plate with ear plates are round holes.

6. The beam-column connection node according to claim 1, characterized in that: The strip flange cover plate with ear plates has four ear plates arranged at equal intervals.

7. The beam-column connection node according to claim 1, characterized in that: The L-shaped web connecting plate with crescent-shaped ear plates comprises: The first limb, wherein the first limb of one L-shaped web connecting plate with a crescent-shaped ear plate is connected and fixed to the web of the cantilever beam by a high-strength bolt group, and the first limb of the other L-shaped web connecting plate with a crescent-shaped ear plate is connected and fixed to the web of the steel beam by a high-strength bolt group, and a plurality of crescent-shaped ear plates are equidistantly arranged at the upper and lower ends of the first limb; The second limb of one L-shaped web connecting plate with a crescent-shaped ear plate and the second limb of another L-shaped web connecting plate with a crescent-shaped ear plate are connected to each other through a high-strength bolt group.

8. The beam-column connection node according to claim 7, characterized in that: The crescent-shaped ear plates of the L-shaped web connecting plate with crescent-shaped ear plates are arranged two at equal distances at the upper and lower ends of the first limb.

9. The beam-column connection node according to claim 7, characterized in that: The pin-shaft shear damping chain rods are provided with four, which are in groups of two and pass through the multiple crescent-shaped ear plates at the upper and lower ends of the first limb of two L-shaped web connecting plates with crescent-shaped ear plates and the corresponding ear plates on the two strip flange cover plates with ear plates.

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