CN205857376U - A kind of novel joint attachment means being applicable to prefabricated concrete structure - Google Patents

Abstract

The utility model proposes a new node connection device suitable for assembled concrete structures, including: a node damper, which is a node friction damper or a node metal damper; an end plate, which includes a first connecting plate and a second connecting plate , respectively arranged at both ends of the node damper; connecting bolts, respectively installing the end plates on both sides on the prefabricated beams, prefabricated columns or shear walls with reserved channels. The utility model proposes a high-performance node connection device suitable for prefabricated concrete structures, which can change the force transmission path of the beam-column and beam-wall nodes, bypass the node area, and reduce the force of the nodes, thus achieving simplified Purpose of node construction.

Description

A new node connection device suitable for prefabricated concrete structures

technical field

The utility model relates to the field of construction, and in particular to a new node connection device suitable for prefabricated concrete structures, which can be applied to prefabricated frame structures, prefabricated frame-shear wall structures and prefabricated frame-shear wall structures in earthquake-prone areas. core tube structure.

Background technique

At present, in order to meet the requirements of being equivalent to cast-in-place and ensure the overall performance of the prefabricated concrete structure, the joint structure of the prefabricated concrete structure is complicated, which causes many difficulties in design, production and construction, and seriously restricts the development of building industrialization. The utility model proposes a high-performance node connection device suitable for prefabricated concrete structures, which can change the force transmission path of the beam-column and beam-wall nodes, bypass the node area, reduce the force of the node, and thus simplify Design to achieve the purpose of simplifying the node structure.

During the construction of prefabricated concrete buildings, many support systems are bound to be used for hoisting and assembling various prefabricated components. The installation of supports will cause chaos on the construction site and affect the construction progress. Using the high-performance node connection of the utility model, the beam support can be omitted, and the prefabricated beam is directly placed on the connection steel plate of the node device and fixed with bolts during hoisting, without further support. In this way, the setting of supports on the construction site can be reduced, the messy situation on the construction site can be greatly improved, and the construction efficiency can be greatly improved.

Compared with cast-in-place concrete structures, prefabricated concrete structures have relatively weaker integrity and complex node structures. At the same time, the seismic performance of prefabricated concrete structures has drawn close attention from the engineering and academic circles. Existing studies have shown that the failure characteristics of prefabricated concrete structures under earthquakes are mainly manifested in the discreteness and collapse of the overall structure due to the failure of the connections between components, while the prefabricated components themselves are less damaged. In the past, research on the seismic performance of prefabricated concrete structures at home and abroad mainly focused on the joints of the components, and there were relatively few studies on the overall seismic performance of the structure. The research on joints is mainly devoted to improving the seismic capacity of component joints through certain structural measures, which belongs to the category of traditional seismic structures, but complex structural measures often lead to complicated construction of component joints, and the overall structure still relies on the plastic deformation of its own components to consume Earthquake energy is dissipated, and the structure as a whole lacks effective isolation measures for vertical earthquake motion. Seeking a more reasonable seismic performance and resisting a certain degree of unpredictable catastrophic earthquake has become the primary task for the further development of prefabricated concrete structures.

Energy dissipation and shock absorption technology is an effective method for the application of modern structural vibration control theory in structural anti-seismic fortification. Existing engineering examples have verified its effectiveness in improving structural anti-seismic performance, ensuring the structural safety of building structures under strong earthquakes and personnel safety. Therefore, the application of energy dissipation and shock absorption technology to prefabricated concrete structures can greatly improve the seismic performance of the structure to a certain extent, so that the structure can meet the seismic fortification requirements under the action of earthquakes, which has important engineering value and broad application prospects.

The application of shock absorption technology to precast concrete structures can effectively improve the problem of weak seismic performance of precast concrete structure joints, realize the passive control and energy dissipation of the superstructure under earthquake action, and have an important theory for improving the overall seismic performance of precast concrete structures Significance and engineering application value.

Most of the dampers currently developed are generally connected to the main structure through steel supports. The support structures mainly include oblique bar type, herringbone type, gantry type, cross type, etc. These additional support members increase the damper installation on the one hand. The construction process and time, and waste of materials; on the other hand, the steel support installed in the structure increases the lateral stiffness, but it is also easy to generate additional internal forces on the structure; moreover, the layout of doors and windows in the building structure is greatly restricted. It takes up too much building space, affects the use function of the structure, gives people a sense of depression in space, and hinders the beauty of the building. Moreover, the market for these dampers is still monopolized by several companies, resulting in very expensive dampers. In addition, there is no effective way to realize these dampers in the corresponding design and analysis software, making it difficult for structural designers to understand And its performance and characteristics are well known, which restricts the application of this energy dissipation and shock absorption technology in structures, especially in the beam-column joint area with poor seismic performance.

The utility model is installed at the node position of the structure, does not affect the layout of building doors and windows, does not need to occupy too much building space, and does not cause space depression and affect the appearance of the building.

Utility model content

The utility model proposes a high-performance node connection device suitable for the assembled concrete structure, aiming at the disadvantages of complex joint connection of the assembled concrete structure and many support systems on the construction site. The product has three functions of force transmission, support and damping. That is, in the construction stage, the connection can provide temporary support for the installation of prefabricated components, eliminating the need for traditional support systems, saving the construction period and cost of the project; in the normal use stage, This connection can provide force transmission for the structure, reduce the internal force of the node, and provide space for simplifying the structure of the node; during an earthquake, the energy dissipation performance of the node can be used to reduce the seismic response of the structure, thereby protecting the main building from damage caused by the earthquake force . In addition, in order to overcome the problem that the size of traditional structure energy-consuming and shock-absorbing products is large and affects the use of building functions, it is proposed to integrate the damping function into the above-mentioned connecting products to realize the miniaturization and integration of seismic dampers and minimize the impact on the building. The effect of using space.

In order to achieve the above purpose, the utility model proposes a new node connection device suitable for prefabricated concrete structures, including:

a nodal damper, which is a nodal friction damper or a nodal metal damper;

end plates, including a first connecting plate and a second connecting plate, respectively arranged at both ends of the node damper;

Bolts are connected, and the end plates on both sides are respectively installed on prefabricated beams, prefabricated columns or shear walls with reserved channels.

Further, the node friction damper is provided with friction plates, which include six friction plates and five friction plates, the five friction plates and six friction plates are interlaced and fixed by bolts to form a friction plate.

Further, the six friction plates are six fan-shaped plates arranged side by side on the surface of the end plate, each fan-shaped plate is respectively provided with an arc-shaped round head slideway along its arc angle.

Further, the five-friction plates are five fan-shaped plates arranged side by side on the surface of the end plate, and the arc angle and thickness of the plates are respectively matched with the arc angle and spacing of the six friction plates.

Further, the node metal damper is composed of an inner steel plate, two outer steel plates, mild steel energy-dissipating steel sheets and hoops,

Wherein, the inner steel plate is hollowed out, and the two outer steel plates are also hollowed out. The inner steel plate and the outer steel plate are placed in parallel. They are respectively vertically embedded in the hollows of the outer steel plates on both sides, and the outer surface of the outer steel plates is provided with a limit hoop, and the part of the soft steel energy-dissipating steel sheet protruding from the outer steel plate is connected with the limit hoop by bolts.

Further, the hoop is located on the outer side of the outer steel plate and welded to the outer surface of the outer steel plate, and the hoop is connected to the mild steel energy-dissipating steel sheet by high-strength bolts to fix the mild-steel energy-dissipating steel sheet.

Further, the mild steel energy-dissipating steel sheet is made of steel with a yield strength between 100MPa and 225MPa.

Further, the inner steel plate, the outer steel plate and the hoop are made of steel with a yield strength not lower than 235MPa.

Further, the end plate is made of steel with a yield strength not lower than 235MPa.

The utility model proposes a high-performance node connection device suitable for prefabricated concrete structures, and is mainly suitable for beam-column and beam-wall nodes of prefabricated concrete frames, frame shears, and frame tube structures.

Prefabricated frame columns and prefabricated frame beams, core tube shear walls and prefabricated frame beams are connected through nodes, and the node force is transmitted through dampers, bypassing the beam-column and beam-wall node areas, changing the prefabricated concrete structure beam-column, The internal force transmission path of the beam-wall joint reduces the bending moment and shear force value at the end of the joint, making the force of the prefabricated concrete structure system more reasonable; thereby changing the design control section position of the beam-column and beam-wall ends, making the seismic design The mechanism of "strong nodes and weak components" can be realized, and the reduction of the internal force in the node area can optimize the design to achieve the purpose of simplifying the design. It can effectively reduce and delay the development of cracks in the core area of the wall and column joints, move the plastic hinge at the core area of the joint outward, and protect the relatively weak core area of the joint and the post-casting area at the beam end.

The new node connection can be directly installed in the structural beam-column, beam-wall node area, avoiding the use of other auxiliary installations and supporting rods, and the embedded parts of the node connection can be accurately embedded in the prefabricated component manufacturing process to ensure the installation accuracy of the device . During the construction process, the steel plate connecting the end plate on one side of the new node connection is connected to the frame column or the embedded part of the shear wall, and no additional support is required. Then hoist the prefabricated frame beam, place the prefabricated beam on the end plate on the other side of the new node connection and fix it with the embedded parts of the prefabricated beam with bolts. At this time, the node damper is used as a temporary support for the beam, which can avoid the traditional support System, reduce construction process and time, avoid material waste, save construction period and cost.

Under the frequent earthquake level, the new joint can provide a certain stiffness for the structure and reduce the lateral deformation of the structure, but it does not provide damping; under the basic intensity and rare earthquake level, the damping of the joint plays a role to realize energy dissipation and shock absorption role, thereby protecting other major stress-bearing components. The damper can not only improve the energy dissipation capacity of the connection nodes of the prefabricated concrete structure, control the cracking of the beam at the node position, but also dissipate energy to protect the main structure, improve the seismic performance of the overall structure, and avoid serious damage or collapse of the structure in the earthquake , to achieve a "win-win" effect of improving the seismic performance of the components and the overall structure. The post-earthquake repair is convenient, and the energy-dissipating shock-absorbing device connecting the beam-column and the beam-wall is replaced to provide hardware guarantee for structural recoverability.

This high-performance node connection device cancels the auxiliary support rods in the traditional damper, and connects the embedded parts in the beam, column and wall through the connecting steel plates on both sides. The damper is installed at the node of the beam column or beam wall, and the volume is relatively small. Small and flexible, it will not affect the function of the building. It is only necessary to place embedded parts when making prefabricated components (prefabricated columns, prefabricated beams, prefabricated walls), and connect the connecting steel plate of the damper to the prefabricated components through bolts during installation. The operation is simple and fast. This type of connection is suitable for mass production in factories to ensure accuracy. This is in line with the requirements of the industrialization of prefabricated buildings.

High-performance joint connections of fabricated concrete structures are able to meet design codes and performance-based seismic design requirements.

Description of drawings

Fig. 1 is a schematic structural diagram of a node friction damper in a preferred embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a node metal damper in a preferred embodiment of the present invention.

Fig. 3 is a schematic layout diagram of the node connection device in a preferred embodiment of the present invention.

Fig. 4 is a schematic diagram of the force transmission path of the node connecting device structure in a preferred embodiment of the present invention.

detailed description

The specific embodiments of the present invention are given below in conjunction with the accompanying drawings, but the present invention is not limited to the following embodiments. According to the following description and claims, the advantages and features of the utility model will be more clear. It should be noted that all the drawings are in very simplified form and use imprecise ratios, which are only used for the purpose of conveniently and clearly assisting in describing the embodiment of the present utility model.

Please refer to Fig. 1 and Fig. 2, Fig. 1 is a schematic structural diagram of a node friction damper according to a preferred embodiment of the present invention. Fig. 2 is a schematic structural diagram of a node metal damper in a preferred embodiment of the present invention. The utility model proposes a new node connection device suitable for prefabricated concrete structures, including: a node damper, which is a node friction damper 100 or a node metal damper 600; an end plate 200, which includes a first connecting plate 210 and a second connecting plate The two connecting plates 220 are respectively arranged at both ends of the node damper 100; the connecting bolts 300 are used to respectively install the two end plates 200 on the prefabricated beams, prefabricated columns or shear walls with reserved channels.

According to a preferred embodiment of the present utility model, the node friction damper 100 is provided with a friction plate 400, which includes six friction plates 410 and five friction plates 420, the five friction plates 420 and six friction plates 410 Staggered combination and fixed by bolt 500 connection. The end plates 200 on both sides are rectangular plates, and the friction plate 400 is fixedly connected to the end plates 200 .

Further, the six friction plates 410 are six fan-shaped plates arranged side by side on the surface of the end plate 200, and each fan-shaped board is respectively provided with an arc-shaped round head slideway along its arc angle. The five-friction plates 420 are five fan-shaped plates arranged side by side on the surface of the end plate 200 , and their arc angles and plate thicknesses match the arc angles and spacing of the six-friction plates 410 . Mounting screw holes are provided on the end plate 200 connected to the friction plate 400, and the end plates 200 on both sides of the friction plate 400 are respectively installed on the prefabricated beams, Prefabricated columns or shear walls. The included angle, size and shape of the two end plates of the node friction damper 100 need to match the size and included angle of the prefabricated beams, prefabricated columns, and shear walls on which the damper is to be installed, and six friction plates need to be processed accordingly 410 and the sector angle, spacing and thickness of the five friction plates 420 to ensure the stable sliding of the friction plates.

The node metal damper 600 is composed of an inner steel plate 610, two outer steel plates 620, a mild steel energy-dissipating steel plate 630 and a hoop 640, wherein the inner steel plate 620 is hollowed out, and the two outer steel plates 620 Also in the form of a hollow, the inner steel plate 610 and the outer steel plate 620 are placed in parallel, the middle part of the mild steel energy-dissipating steel sheet 630 is vertically embedded in the hollow of the inner steel plate 610, and the two ends are respectively vertically embedded in the hollow of the outer steel plates 620 on both sides. , the outer surface of the outer steel plate 620 is provided with a limiting hoop 640, and the part of the mild steel energy-dissipating steel sheet 630 protruding from the outer steel plate is connected with the limiting hoop 640 by bolts. The end plates 700 on both sides are rectangular plates, and the inner steel plate 610 and the outer steel plate 620 are fixedly connected with the two end plates 700 respectively. Shear wall connections.

Further, the hoop piece 640 is located on the outer side of the outer steel plate 620 and welded on the outer surface of the outer steel plate 620. The hoop piece 640 and the mild steel energy-dissipating steel sheet 630 are connected by high-strength bolts to fix the The mild steel energy-dissipating steel sheet 630 is described. The mild steel energy-dissipating steel sheet 630 is made of steel with yield strength between 100 MPa and 225 MPa, and its size and thickness should be determined according to the structural size and energy consumption requirements in the actual shock absorption scheme. The inner steel plate 610, the outer steel plate 620, the hoop piece 640 and the end plates 700 on both sides are made of steel with a yield strength not lower than 235MPa.

Please refer to FIG. 3 and FIG. 4 . FIG. 3 is a schematic layout diagram of a node connection device in a preferred embodiment of the present invention. Fig. 4 is a schematic diagram of the force transmission path of the node connecting device structure in a preferred embodiment of the present invention. Prefabricated frame columns and prefabricated frame beams, shear walls and prefabricated frame beams are connected through the new node, and the node force is transmitted through the device, bypassing the beam-column and beam-wall node areas, so that the beam-column and beam-wall nodes are stressed Reduced, so that the design can be simplified to achieve the purpose of simplifying the node structure. During the construction process, the new node connection is pre-fixed on the frame column or shear wall through the connecting steel plate, and then the prefabricated frame beam is fixed on the connecting steel plate of the node, eliminating the support of the frame beam.

At present, in order to ensure the integrity of the prefabricated concrete structure, the connection structure of the beam-column and beam-wall joint areas is complicated, and the number of steel bars is large, which brings a lot of trouble to the design, production, and construction, and restricts the development of building industrialization. Adopting the high-performance node connection technology of the utility model, by setting a new type of node device, the internal force transmission path of the beam-column and beam-wall nodes of the prefabricated concrete structure is changed, and the bending moment and shear force value at the end of the node are reduced, so that the prefabricated concrete structure The force of the structural system is more reasonable; thereby changing the position of the design control section of the beam-column and beam-wall ends, so that the "strong node, weak member" mechanism in the seismic design can be realized, and the reduction of the internal force in the node area can optimize the design. Reducing the number of reinforcements in the beam-column and beam-wall joint areas achieves the purpose of simplifying the design, and at the same time reduces the difficulty of prefabricated component production and construction assembly. For the mid-beam-column joints in the prefabricated concrete structure, the shear force at the joint position is reduced after the dampers are arranged, so as to realize the requirement of "strong shear and weak bending" in the seismic design, and at the same time, the external forces generated by the dampers can basically balance each other. Axial forces on nodal members have no effect.

The high-performance node connection device can be directly installed in the structural beam-column, beam-wall node area, avoiding the use of other auxiliary installation and support rods, and the embedded parts connecting the damper can be accurately embedded in the prefabricated component manufacturing process, ensuring Damper installation accuracy. During the construction process of traditional prefabricated concrete structures, many supports will be set under the beams, which will affect the construction speed. By adopting the high-performance node connection technology of the utility model, the support under the beam can be omitted. During the construction process, the steel plate connecting the end plate on one side of the damper is connected with the frame column or the embedded part of the shear wall, without setting support. Then hoist the prefabricated frame beam, place the prefabricated beam on the end plate on the other side of the damper and fix it with the embedded parts of the prefabricated beam with bolts. At this time, the node damper acts as a temporary support for the beam, which can eliminate the traditional support system , Reduce construction procedures and time, avoid material waste, save construction period and cost.

Taking the node metal damper as an example to illustrate the energy dissipation and shock absorption principle of the new high-performance node connection. The sideways deformation of the prefabricated concrete structure under the action of the earthquake causes the relative rotational displacement of the beam-column and beam-wall node areas, which drives the shear hysteretic deformation of the soft steel energy-dissipating steel sheet of the new metal node damper, which has become the first in the node area of the protective structure. An anti-seismic defense line is installed to reduce the lateral displacement and interstory displacement angle of the structure, and effectively protect the beam-column and beam-wall joints. The new metal node damper forms an energy-dissipating and shock-absorbing system by connecting the inner and outer steel plates with the structural embedded parts or post-anchored connecting parts. The soft steel energy-dissipating steel sheets are fixed between the outer and inner steel plates, and the inner and outer The relative displacement is generated to drive the energy consumption of the soft steel energy-dissipating steel sheet to shear and deform, and the inner and outer steel plates themselves do not participate in the deformation energy consumption. Under the frequent earthquake level, the new node damper provides a certain stiffness for the structure, reduces the lateral deformation of the structure, and does not provide damping; realizes the energy dissipation mechanism under the basic intensity and rare earthquake level, and plays the role of energy dissipation and shock absorption function, thereby protecting other main stress components. The damper can not only improve the energy dissipation capacity of the connection nodes of the prefabricated concrete structure, control the cracking of the beam at the node position, but also dissipate energy to protect the main structure, improve the seismic performance of the overall structure, and avoid serious damage or collapse of the structure in the earthquake , to achieve a "win-win" effect of improving the seismic performance of the components and the overall structure.

Traditional dampers are bulky and occupy building space, and some auxiliary components or supports need to be installed during construction. These additional support components increase the construction process and time of damper installation and waste materials. The setting of supports will also restrict the arrangement of doors and windows in the building structure, occupy too much building space, affect the use function of the structure, give people a sense of depression in space, and hinder the beauty of the building. The use of this high-performance node connection device can cancel the auxiliary support rods in the traditional damper, and connect the embedded parts in the beam, column and wall through the connecting steel plates on both sides. The damper is installed at the node of the beam column or beam wall. Small in size, flexible in use, and will not affect the function of the building. It is only necessary to place embedded parts when making prefabricated components (prefabricated columns, prefabricated beams, prefabricated walls), and connect the connecting steel plate of the damper to the prefabricated components through bolts during installation. The operation is simple and fast. This type of connection is suitable for mass production in factories to ensure accuracy. This is in line with the requirements of the industrialization of prefabricated buildings.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Those with ordinary knowledge in the technical field to which the utility model belongs can make various changes and modifications without departing from the spirit and scope of the utility model. Therefore, the protection scope of the present utility model should be defined by the claims.

Claims (9)

1. A novel joint connection device suitable for fabricated concrete structures, characterized in that it comprises: a nodal damper, which is a nodal friction damper or a nodal metal damper; end plates, including a first connecting plate and a second connecting plate, respectively arranged at both ends of the node damper; Bolts are connected, and the end plates on both sides are respectively installed on prefabricated beams, prefabricated columns or shear walls with reserved channels. 2. The novel node connection device suitable for prefabricated concrete structures according to claim 1, wherein the node friction damper is provided with friction plates, which include six friction plates and five friction plates, so The five friction plates and the six friction plates are interlaced and fixed by bolts to form the friction plates. 3. The new node connection device suitable for prefabricated concrete structures according to claim 2, characterized in that, the six friction plates are six fan-shaped plates arranged side by side on the surface of the end plate, and the upper edge of each fan-shaped plate The arc angles are respectively provided with arc-shaped round head slideways. 4. The new node connection device suitable for prefabricated concrete structures according to claim 2, characterized in that, the five friction plates are five fan-shaped plates arranged side by side on the surface of the end plate, and the angle of the arc is the same as that of the plate The thicknesses match the arc angles and spacings of the six friction plates respectively. 5. The new node connection device suitable for prefabricated concrete structures according to claim 1, characterized in that the node metal damper consists of an inner steel plate, two outer steel plates, mild steel energy-dissipating steel sheets and ferrules components, Wherein, the inner steel plate is hollowed out, and the two outer steel plates are also hollowed out. The inner steel plate and the outer steel plate are placed in parallel. They are respectively vertically embedded in the hollows of the outer steel plates on both sides, and the outer surface of the outer steel plates is provided with a limit hoop, and the part of the soft steel energy-dissipating steel sheet protruding from the outer steel plate is connected with the limit hoop by bolts. 6. The novel node connection device suitable for prefabricated concrete structures according to claim 5, characterized in that, the hoop is located on the outside of the outer steel plate and welded on the outer surface of the outer steel plate, the hoop and The mild steel energy-dissipating steel sheets are connected by high-strength bolts to fix the mild-steel energy-dissipating steel sheets. 7. The new node connection device suitable for prefabricated concrete structures according to claim 5, wherein the soft steel energy-dissipating steel sheet is made of steel with a yield strength between 100MPa and 225MPa. 8. The new node connection device suitable for prefabricated concrete structures according to claim 5, wherein the inner steel plate, outer steel plate and hoop are made of steel with a yield strength of not less than 235MPa. 9. The new node connection device suitable for prefabricated concrete structures according to claim 1, wherein the end plate is made of steel with a yield strength not lower than 235MPa.