Novel function-recoverable fabricated steel reinforced concrete beam-column joint structure

Abstract

The invention relates to a novel function-recoverable fabricated steel reinforced concrete beam-column joint structure which comprises a prefabricated steel reinforced concrete column and a prefabricated steel reinforced concrete beam which are vertically connected through a recoverable joint connecting area. The recoverable joint connecting area comprises a concrete shell, a filling block, an energy consumption folded plate, an energy consumption plate, connecting plates and connecting bolts, overhanging beam sections are arranged at the connecting positions of the steel reinforced concrete column and the steel reinforced concrete beam, and the connecting plates are fixedly mounted on the two side faces of webs of the two overhanging beam sections in an attached mode through transversely penetrating bolts; the upper surfaces of the upper wing plates and the lower surfaces of the lower wing plates of the two overhanging beam sections are provided with energy consumption plates respectively, the lower surfaces of the upper wing plates and the upper surfaces of the lower wing plates of the two overhanging beam sections are provided with energy consumption folded plates respectively, and the energy consumption plates, the energy consumption folded plates and the wing plates are fixed in a penetrating mode through connecting bolts. The profile steel is slow in response to external environment temperature change, and temperature deformation is reduced.

Description

Technical field: The present invention belongs to the technical field of steel structures, and in particular relates to a green, environmentally friendly, recoverable assembled beam-column node structure that is earthquake-resistant and progressively collapse-resistant. Background technology: As the concept of green, circular and low-carbon development is integrated into the construction industry, many new structural forms and construction methods have been proposed in the research on earthquake resistance and progressive collapse resistance; among them, the recoverable functional structure has become a new type of efficient earthquake-resistant system, forming a building structure with a full life cycle.

[0003] Prefabricated structures are the key development direction in the field of green buildings and building industrialization. They have the advantages of improving production efficiency, energy saving, environmental protection, and reducing pollution, and have broad application prospects. However, the beam-column nodes and connection parts in prefabricated frame structures are weak links in earthquake resistance and are prone to structural damage.

[0004] In building structures, the situation of "strong beams and weak columns" often occurs in beam-column joints, causing the entire building to collapse, seriously endangering people's lives and property. In order to improve the shortcomings of prefabricated frame structures, it is necessary to explore new prefabricated connection methods to better realize the concept of "strong columns and weak beams" and further study the working mechanism of the beam hinge mechanism.

[0005] The current development trend of prefabricated buildings focuses on high precision, standardization, normalization and integration of products; the construction of prefabricated structures replaces wet operations with dry operations, which improves work efficiency and shortens construction periods; however, this type of prefabricated composite structure still has many important wet operations at the node connection parts, and the binding and positioning difficulties of steel bars and the hidden dangers of pouring quality directly lead to a significant reduction in the high precision and standardization of such node forms. In addition, prefabricated structural materials tend to use a large amount of lightweight materials to reduce the weight of the building and increase the flexible connection of the prefabricated type, which is also contrary to the current design status of prefabricated steel concrete beams. This type of node still has many problems in the actual construction process, such as a lot of manual work, a large amount of on-site wet work, and unstable engineering quality. In order to solve the above problems, some related building structures have been improved by using prefabricated steel concrete composite structures.

[0006] China's patent CN 115030309 A "A concrete beam-column assembled node with cantilever beam section" includes two H-shaped steel beams embedded in the cantilever beam end and the prefabricated beam end respectively, the I-shaped sections of the two H-shaped steel beams are close to or fit together, and two sets of upper and lower angle steels are respectively provided on both sides of the web of the H-shaped steel beam, the long limb of the angle steel fits the web of the H-shaped steel beam and is fixed thereto, the short limb of the angle steel fits the upper wing plate or the lower wing plate of the H-shaped steel beam, and the upper and lower wing plates of the H-shaped steel beam are both provided with steel plates, which are fixed together with the short limb of the angle steel on the same side by a number of bolts; the node form is simple to make and easy to construct, and the beam-column node can be quickly assembled into a whole. This node combines the good yield energy dissipation effect of steel structure with traditional reinforced concrete, and can transfer the plastic hinge from the core area of ​​the beam-column to the H-shaped steel beam, which not only protects the core area of ​​the beam-column node from damage, but also improves the seismic performance of the beam-column node; at the same time, this node adopts steel structure dry connection, which greatly improves the on-site construction efficiency.

[0007] China's CN 218148861 U patent for "A prefabricated steel-concrete beam-column node" locks the T-shaped I-shaped steel embedded inside the column of the prefabricated beam-column node with two sets of back-to-back U-shaped channel steel embedded inside the prefabricated beam through high-strength bolts, and energy-absorbing gaskets are placed between the fitting surfaces. This beam-column node solves the shortcomings of poor seismic performance of prefabricated beam-column nodes, while avoiding the problems of dense steel bars in the core area of ​​the column node and easy collision between steel bars during on-site construction and assembly.

[0008] The design of the concrete beam-column assembly node in the prior art still easily causes brittle failure of the prefabricated steel concrete beam-column node during the stress process, and it is irreparable. At the same time, the steel structure at the beam-column node is exposed to the natural environment for a long time and is susceptible to corrosion, which not only affects the aesthetics of the building, but also threatens the structural safety and service life of the building. Summary of the invention: In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a green, environmentally friendly, recoverable prefabricated beam-column node structure that is resistant to earthquakes and progressive collapse. This green, environmentally friendly, recoverable prefabricated beam-column node structure that is resistant to earthquakes and progressive collapse greatly improves the overall stability of the structure, makes the steel section unresponsive to changes in external environmental temperature, and reduces temperature deformation.

[0010] The present invention discloses a novel assembled steel-concrete beam-column node structure with recoverable functions, characterized in that it comprises a prefabricated steel-concrete column and a steel-concrete beam, wherein the steel-concrete column and the steel-concrete beam are vertically connected via a recoverable node connection area, wherein the recoverable node connection area comprises a concrete shell, a filling block, an energy-absorbing folding plate, an energy-absorbing plate, a connecting plate and a connecting bolt, wherein the connection between the steel-concrete column and the steel-concrete beam is provided with an outrigger beam section, the two side surfaces of the webs of the two outrigger beam sections are fixedly provided with connecting plates by cross bolts, the upper surfaces of the upper wing plates and the lower surfaces of the lower wing plates of the two outrigger beam sections are respectively provided with energy-absorbing plates, the lower surfaces of the upper wing plates and the upper surfaces of the lower wing plates of the two outrigger beam sections are respectively provided with energy-absorbing folding plates, the energy-absorbing plates, the energy-absorbing folding plates and the wing plates are connected and fixed by connecting bolts, the outer sides of the webs of the two outrigger beam sections are provided with filling blocks, and the outer peripheral covers of the two outrigger beam sections are provided with a concrete shell.

[0011] Furthermore, the concrete shell comprises two U-shaped concrete blocks with notches arranged opposite to each other, an outwardly extending pin is arranged on the end face of the notch of the first concrete block, and an inwardly extending slot which can be plugged into the outwardly extending pin is arranged on the end face of the notch of the second concrete block.

[0012] Furthermore, the bottoms of the grooves of the first concrete block and the second concrete block are both provided with through-holes for facilitating the insertion of connecting bolts, and the connecting bolts are locked and fixed by nuts after passing through the through-holes.

[0013] Furthermore, the connecting plate is a rectangular plate, on which through holes for the transverse bolts are arranged, and the web of the extended beam section is also provided with through holes for the transverse bolts.

[0014] Furthermore, the energy absorbing plate and the energy absorbing folding plate are both rectangular plates, the two sides of the energy absorbing plate are provided with concave arc parts, the middle part of the energy absorbing folding plate has an arched part, and the concave arc part and the arched plate are directly opposite to the intersection of the two extended beam sections.

[0015] Furthermore, the wing plate is provided with through holes for passing connecting bolts.

[0016] Furthermore, the above-mentioned steel-concrete columns and steel-concrete beams are both prefabricated beams and prefabricated columns in the form of steel-concrete outer shells; the prefabricated beams and prefabricated columns are mainly composed of steel, structural reinforcement and an outer shell concrete protective layer.

[0017] Furthermore, the filling block is made of lightweight, heat-insulating material.

[0018] Furthermore, a concrete floor is laid on the above-mentioned steel concrete beam and the recoverable node connection area; a reserved operation groove is opened on the concrete floor for easy disassembly and assembly of the recoverable node connection area, and a concrete cover plate is installed in the reserved operation groove.

[0019] The advantages of the novel recoverable assembled steel-concrete beam-column node structure of the present invention are as follows: 1. The new node of the present invention overcomes the shortcomings of steel structure being susceptible to corrosion and poor fire resistance, and eliminates the construction process of rust removal and fire-retardant coating. The combined effect of steel and concrete greatly improves the overall stability of the structure, making the steel slow to react to changes in external environmental temperature and reducing temperature deformation.

[0020] 2. The present invention meets the design principle of strong columns and weak beams, and realizes the outward movement of plastic hinges through the connecting components in the recoverable node connection area, thereby achieving a ductile failure mode and improving the seismic and anti-collapse performance of the node.

[0021] 3. The energy-absorbing folded plates provided at the upper and lower wing plates in the beam-column node area of ​​the present invention increase the ductility of the node, reduce the possibility of brittle failure of the beam-column node, and greatly improve the earthquake resistance and progressive collapse resistance of the beam-column node.

[0022] 4. The nodes of the present invention are recoverable, and the energy-absorbing plates provided in the beam-column node area are replaceable. When the beam-column node is damaged, it can be repaired by replacing the energy-absorbing plates, thereby further improving the service life of the beam-column node and saving economic costs.

[0023] 5. The light-weight and heat-insulating filling blocks of the present invention can mitigate the impact of temperature changes and reduce the deadweight of the structure, and can also serve as built-in templates for prefabricated beams.

[0024] 6. The present invention is a recoverable steel-concrete beam-column steel structure with simple structure, convenient operation, environmentally friendly materials, easy disassembly and recycling. Description of the drawings: Figure 1 It is a schematic diagram of the overall structure of a novel assembled steel-concrete beam-column node with restorable functions according to the present invention.

[0026] Figure 2 It is a schematic diagram of the disassembly of a novel functionally restorable assembled steel-concrete beam-column node structure of the present invention.

[0027] Figure 3 This is a diagram of the steps for installing a new type of restorable function assembled steel-concrete beam-column node connection plate of the present invention.

[0028] Figure 4 This is a diagram of the installation steps of a new type of restorable function assembled steel-concrete beam-column node energy-absorbing plate of the present invention.

[0029] Figure 5 This is a diagram of the steps for installing a novel, restorable function assembled steel-concrete beam-column node filling block of the present invention.

[0030] Figure 6This is a diagram of the steps for installing a new type of restorable function assembled steel-concrete beam-column node concrete shell of the present invention.

[0031] Figure 7 This is a completed installation diagram of the recoverable node connection area of ​​a new type of prefabricated steel-concrete beam-column node with recoverable functions according to the present invention.

[0032] Figure 8 It is a schematic diagram of the overall structure of a novel functionally restorable assembled steel-concrete beam-column node of the present invention taking into account the floor condition.

[0033] The numbers in the attached drawings are: 1—steel concrete column; 2—steel concrete beam; 3—concrete shell; 4—filling block; 5—energy absorption folded plate; 6—dog bone energy absorption plate; 7—connecting plate; 8—connecting bolt; 9—recoverable node connection area; 10—concrete floor slab; 11—concrete cover plate; 12—cross bolt; 13—through hole; 14—reserved operation groove; 15—extended beam section; 16—concave arc portion; 17—arched portion; 18—extended latch; 19—built-in slot. Specific implementation method: A novel prefabricated steel-concrete beam-column node structure with restorable functions of the present invention comprises a prefabricated steel-concrete column 1 and a steel-concrete beam 2, wherein the steel-concrete column 1 and the steel-concrete beam 2 are vertically connected via a restorable node connection area 9, and both the steel-concrete column 1 and the steel-concrete beam 2 are prefabricated beams and prefabricated columns in the form of steel wrapped in concrete; the prefabricated beams and prefabricated columns are mainly composed of steel, structural reinforcement and an outer concrete protective layer (which is the prior art and will not be described in detail).

[0035] The recoverable node connection area 9 includes a concrete shell 3, a filling block 4, an energy-absorbing folding plate 5, an energy-absorbing plate 6, a connecting plate 7 and a connecting bolt 8. The connection between the steel-concrete column 1 and the steel-concrete beam 2 is provided with an extended beam section 15 (that is, an I-shaped steel cantilever beam section is extended from the side walls of the steel-concrete column 1 and the steel-concrete beam 2 for beam-column connection). The two side surfaces of the webs of the two extended beam sections are fixedly mounted with connecting plates 7 by cross bolts 12. The connecting plate 7 is a rectangular plate on which through holes for passing the cross bolts 12 are arranged. The web of the extended beam section 15 is also provided with through holes for passing the cross bolts. The web of the extended beam section is clamped between the two connecting plates 7 by the cross bolts 12.

[0036] The recoverable node connection area 9 forms a plastic deformation area in the beam-column node, realizes the outward movement of the plastic hinge, and causes damage to occur in the energy dissipation plate.

[0037] Energy-absorbing plates 6 are installed on the upper surfaces of the upper wing plates and the lower surfaces of the lower wing plates of the two outrigger beam sections, respectively. Energy-absorbing folded plates 5 are installed on the lower surfaces of the upper wing plates and the upper surfaces of the lower wing plates of the two outrigger beam sections, respectively. Both the energy-absorbing plates 6 and the energy-absorbing folded plates 7 are rectangular plates. Concave arc portions 16 are provided on both sides of the energy-absorbing plate 6. The middle part of the energy-absorbing folded plate 7 has an arched portion 17. The concave arc portion and the arched plate are directly opposite to the intersection of the two outrigger beam sections.

[0038] The energy absorbing plate 6, the energy absorbing folding plate 5 and the wing plate are provided with through holes for passing the connecting bolts 8. The energy absorbing plate 6, the energy absorbing folding plate 5 and the wing plate are fixed by passing the connecting bolts 8 through the through holes. The outer side of the web of the two outrigger beam sections is provided with a filling block 4, and the filling block 4 is a lightweight, heat-insulating material (such as a foam filling block).

[0039] The outer cover of the two outrigger beam sections is provided with a concrete shell 3, which includes two U-shaped concrete blocks with grooves arranged opposite to each other. An outrigger pin 18 is provided on the end face of the groove of the first concrete block, and a built-in slot 19 that can be plugged into the outrigger pin is provided on the end face of the groove of the second concrete block. By plugging the outrigger pin 18 into the built-in slot 19, better positioning and docking of the two concrete blocks can be achieved.

[0040] In order to better fix the two concrete blocks, the bottom of the groove of the first concrete block and the second concrete block are provided with a through-hole 13 for the connection bolt 8 to pass through. After the connection bolt 8 passes through the through-hole 13, it is locked and fixed by a nut. After the extended pin 18 is plugged and positioned with the built-in slot 19, the connection bolt 8 also passes through the through-hole 13 and is locked and fixed by a nut.

[0041] A concrete floor slab 10 is laid on the steel concrete beam 2 and the recoverable node connection area 9; a reserved operation groove 14 is provided on the concrete floor slab 10 for easy disassembly and assembly of the recoverable node connection area 9, a concrete cover slab 11 is installed in the reserved operation groove, and a pull ring is provided on the surface of the concrete cover slab 11, so as to facilitate the removal of the concrete cover slab 11 from the reserved operation groove 14; the concrete floor slab 10 can be a cast-in-place concrete floor slab, and an operation groove 14 is reserved when cast-in-place. The concrete cover slab 11 is a prefabricated concrete block, and after the beam-column node is assembled and the floor slab is cast, the concrete cover slab 11 is placed in the reserved operation groove 14 of the concrete floor slab 10, and can be fixed by buckles, so as to facilitate the subsequent routine maintenance and component replacement of the beam-column node.

[0042] The installation steps of the new type of restorable assembled steel-concrete beam-column node of the present invention are as follows: first, the steel-concrete column and the steel-concrete beam are bolted together at the web of the extended beam section through a connecting plate 7 and connecting bolts 8, such as Figure 3 As shown; and then at the wing plate of the outrigger beam section, a recoverable connection is made by respectively using an energy-absorbing folding plate 5, an energy-absorbing plate 6 and a connecting bolt 8, such as Figure 4As shown; the energy-absorbing folding plates 5 and 6 absorb energy by deformation to achieve a ductile failure mode and avoid brittle fracture; the recoverable connection repairs the damage to the structure by replacing the energy-absorbing folding plates 5 and 6 during earthquake resistance and collapse resistance.

[0043] Secondly, during the installation of the prefabricated steel-concrete beam-column node, the filling block 4 is made of lightweight, heat-insulating materials, such as foam filling blocks, to achieve the purpose of mitigating the impact of temperature changes and reducing the deadweight of the structure; when the steel-concrete beam is prefabricated, the filling block can act as a built-in formwork; in addition, the shape of the filling block 4 in the restorable node connection area 9 can be flexibly prefabricated according to the spatial position.

[0044] Finally, in the installation of the assembled steel-concrete beam-column node, the concrete protective shell 3 is assembled and installed after the node is bolted and reversibly connected. The concrete protective shell 3 is a prefabricated concrete protective layer, which is divided into two parts (the first concrete block and the second concrete block); the extended pins and the built-in slots are pre-set to facilitate the installation of the upper and lower protective shells and enhance the integrity and stability of the node. The concrete protective shell 3 is not used as the main force-bearing structure, and after the upper and lower concrete protective shells are assembled, they are connected to the internal node through the connecting bolts 8 to form an outer protective layer; the connection between the concrete protective shell 3 and the connecting bolts 8 is bolted by the connecting bolts 8 extending outward to the outside of the concrete protective shell 3.

[0045] The I-shaped steel beam can be made of Q235 steel, and the connecting bolts can be made of high-strength bolts.

[0046] The advantages of the novel recoverable assembled steel-concrete beam-column node structure of the present invention are as follows: 1. The new node of the present invention overcomes the shortcomings of steel structure being susceptible to corrosion and poor fire resistance, and eliminates the construction process of rust removal and fire-retardant coating. The combined effect of steel and concrete greatly improves the overall stability of the structure, making the steel slow to react to changes in external environmental temperature and reducing temperature deformation.

[0047] 2. The present invention meets the design principle of strong columns and weak beams, and realizes the outward movement of plastic hinges through the connecting components in the recoverable node connection area, thereby achieving a ductile failure mode and improving the seismic and anti-collapse performance of the node.

[0048] 3. The energy-absorbing folded plates provided at the upper and lower wing plates in the beam-column node area of ​​the present invention increase the ductility of the node, reduce the possibility of brittle failure of the beam-column node, and greatly improve the earthquake resistance and progressive collapse resistance of the beam-column node.

[0049] 4. The nodes of the present invention are recoverable, and the energy-absorbing plates provided in the beam-column node area are replaceable. When the beam-column node is damaged, it can be repaired by replacing the energy-absorbing plates, thereby further improving the service life of the beam-column node and saving economic costs.

[0050] 5. The light-weight and heat-insulating filling blocks of the present invention can mitigate the impact of temperature changes and reduce the deadweight of the structure, and can also serve as built-in templates for prefabricated beams.

[0051] 6. The present invention is a recoverable steel-concrete beam-column steel structure with simple structure, convenient operation, environmentally friendly materials, easy disassembly and recycling.

[0052] The above is only a preferred embodiment of the present invention. For ordinary technicians in this field, according to the teachings of the present invention, it does not require creative labor to design a new type of prefabricated steel plate combined shock-absorbing wall design method that takes into account multi-stage stress in different forms. Without departing from the principles and spirit of the present invention, all equal changes, modifications, substitutions and variations made within the scope of the patent application of the present invention should fall within the scope of the present invention.

Claims

1. A novel prefabricated steel-concrete beam-column node structure with restorable functions, characterized in that: The invention comprises a prefabricated steel concrete column (1) and a steel concrete beam (2), wherein the steel concrete column (1) and the steel concrete beam (2) are vertically connected via a recoverable node connection area (9), wherein the recoverable node connection area (9) comprises a concrete shell (3), a filling block (4), an energy dissipation folded plate (5), an energy dissipation plate (6), a connection plate (7) and connection bolts (8), and an extended beam section is provided at the connection between the steel concrete column (1) and the steel concrete beam (2), and the two extended beam sections are connected to each other. The web plates of the two outrigger beam sections are fixedly mounted with connecting plates (7) by means of transverse bolts (12); the upper surfaces of the upper wing plates and the lower surfaces of the lower wing plates of the two outrigger beam sections are respectively mounted with energy absorbing plates (6); the lower surfaces of the upper wing plates and the upper surfaces of the lower wing plates of the two outrigger beam sections are respectively mounted with energy absorbing folding plates (5); the energy absorbing plates (6), the energy absorbing folding plates (5) and the wing plates are connected and fixed by means of connecting bolts (8); the outer sides of the web plates of the two outrigger beam sections are provided with filling blocks (4); and the outer peripheral covers of the two outrigger beam sections are provided with concrete shells (3).

2. The novel functionally restorable assembled steel-concrete beam-column node structure according to claim 1 is characterized in that: The concrete shell (3) comprises two U-shaped concrete blocks with notches arranged opposite to each other, an outwardly extending plug pin is provided on the end face of the notch of the first concrete block, and a built-in slot capable of plugging with the outwardly extending plug pin is provided on the end face of the notch of the second concrete block.

3. The novel functionally restorable assembled steel-concrete beam-column node structure according to claim 2 is characterized in that: The groove bottoms of the first concrete block and the second concrete block are both provided with through-holes (13) for facilitating the insertion of the connecting bolts (8); the connecting bolts (8) are locked and fixed by nuts after passing through the through-holes (13).

4. The novel functionally restorable assembled steel-concrete beam-column node structure according to claim 1 is characterized in that: The connecting plate (7) is a rectangular plate on which through holes for the transverse bolts to pass through are arranged, and the web of the extended beam section is also provided with through holes for the transverse bolts to pass through.

5. The novel functionally restorable assembled steel-concrete beam-column node structure according to claim 1 is characterized in that: The energy dissipation plate (6) and the energy dissipation folded plate (7) are both rectangular plates. The energy dissipation plate (6) has concave arc portions on both sides. The energy dissipation folded plate 7 has an arch portion in the middle. The concave arc portion and the arched plate face the intersection of the two extended beam sections.

6. The novel functionally restorable assembled steel-concrete beam-column node structure according to claim 1 is characterized in that: The wing plate is provided with a through hole for passing a connecting bolt (8).

7. The novel functionally restorable assembled steel-concrete beam-column node structure according to claim 1 is characterized in that: The steel-concrete column (1) and the steel-concrete beam (2) are both prefabricated beams and columns in the form of steel-concrete encased in concrete; the prefabricated beams and prefabricated columns are mainly composed of steel, structural reinforcement and an outer concrete protective layer.

8. The novel functionally restorable assembled steel-concrete beam-column node structure according to claim 1 is characterized in that: The filling block (4) is made of lightweight, heat-insulating material.

9. The novel functionally restorable assembled steel-concrete beam-column node structure according to claim 1 is characterized in that: A concrete floor slab (10) is laid on the steel concrete beam (2) and the recoverable node connection area (9).

10. The novel functionally restorable assembled steel-concrete beam-column node structure according to claim 9 is characterized in that: The concrete floor slab (10) is provided with a reserved operation groove (14) for facilitating the disassembly and assembly of the recoverable node connection area (9), and a concrete cover plate (11) is installed in the reserved operation groove.

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