Precast beam and precast column node structure with punching damage resistance

Abstract

The invention relates to the field of building structures, and discloses a punching-damage-resistant node structure of precast beams and precast columns, the punching-damage-resistant node structure comprises the precast columns, connecting rings and a plurality of precast beams, the precast columns are sleeved with the connecting rings used for bearing constraining force, and reinforcing meshes used for generating a thin film effect are connected between the connecting rings and the precast columns; a plurality of prefabricated beams are connected to the outer portion of a connecting ring, and the multiple prefabricated beams jointly act on the connecting ring, so that the connecting ring is in a tension balance state. Load transmission between the prefabricated column and the prefabricated beam is adjusted through the thin film effect generated by the reinforcing mesh, so that damage to the structure under the extreme condition is delayed, premature punching damage of components is avoided, the stability of beam-column joints is improved, and the overall ductility of a frame under the extreme damage condition of the column can be remarkably improved.

Description

Technical Field

[0001] The invention relates to the field of building structures, in particular to a node structure of prefabricated beams and prefabricated columns with punching shear damage resistance. Background Art

[0002] With the continuous development of economies around the world, my country's total economic volume has increased rapidly, the scale of infrastructure construction has always been at the forefront of the world, and the demand for industrialization of the construction industry has become more and more urgent. Prefabricated buildings have been increasingly widely used due to their relatively high construction efficiency, resource saving, and reduced construction costs. In prefabricated beam-column nodes, the construction of beam-column nodes is generally achieved by welding steel components on prefabricated columns and prefabricated beams on site or by bolting. However, due to the complex stress conditions in the beam-column node area, especially in extreme cases such as earthquakes, there is often an incoordination in the load transfer between the beam-column node area and the prefabricated columns and prefabricated beams, resulting in insufficient bearing capacity or seismic stress resistance in the beam-column node area, which in turn leads to low ductility in the beam-column node area and shear failure. Especially for structures with relatively large loads, beam-column node assembly schemes are rare, and they are more easily damaged under the influence of disasters such as earthquakes, making it difficult for people to escape and causing casualties. Summary of the invention

[0003] In view of the above problems, the present invention provides a pressure-bearing structure that can avoid premature shear failure of components and increase their stability. It can significantly improve the overall ductility of the frame under extreme damage conditions. The specific solution is as follows: A node structure of prefabricated beams and prefabricated columns with punching shear damage resistance, comprising prefabricated columns, connecting rings and a plurality of prefabricated beams, wherein the prefabricated columns are sleeved with connecting rings for bearing restraining force, and a steel mesh for generating a membrane effect is connected between the connecting rings and the prefabricated columns; Furthermore, the steel mesh structure is a radial structure with the prefabricated column as the origin or a bidirectional cantilever beam structure.

[0004] Furthermore, the connecting ring is circular, and the midpoint of the connecting ring coincides with the axis of the prefabricated column.

[0005] Furthermore, the precast beams, precast columns and connecting rings are all reinforced concrete structures, the precast beams are basket beams, a first grouting channel is reserved on the outside of the connecting ring, and precast steel bars inserted into the first grouting channel are provided at the end of the precast beam; the multiple steel bars in the precast column are respectively tied and connected with the multiple reinforcement heads of the corresponding steel mesh; the inner side of the connecting ring is provided with multiple second grouting holes corresponding to the reinforcement heads of the steel mesh, and the multiple reinforcement heads are respectively inserted into the corresponding second grouting channels.

[0006] Furthermore, the prefabricated beams, prefabricated columns and connecting rings are all steel structures, the prefabricated columns are cross-shaped steel columns, the prefabricated beams are I-shaped steel beams, the connecting rings are steel circular rings, the prefabricated columns are welded and fixed to the ribs of the steel mesh, the steel mesh is welded and fixed to the connecting rings, and the connecting rings are welded and fixed to the prefabricated beams.

[0007] Furthermore, a first steel grid arranged vertically is provided on the inner side of the connecting ring, the first steel grid is arranged circumferentially along the inner side of the connecting ring, the first steel grid is at the same height as the prefabricated column, the first steel grid is welded and fixed to the connecting ring or the first steel grid is tied to the steel mesh by a connecting piece, and the connecting piece is a steel hoop ring or a concrete ring; a second steel grid arranged vertically is provided on the outer side of the connecting ring, the second steel grid is arranged circumferentially along the outer side of the connecting ring, the second steel grid is at the same height as the prefabricated column, and the second steel grid is welded and fixed to the connecting ring.

[0008] Furthermore, a plurality of steel support brackets for supporting the connecting ring are provided at the bottom of the connecting ring. The plurality of steel support brackets are evenly arranged along the circumference of the prefabricated column. The bottom of the steel support bracket is fixedly connected to the surface of the prefabricated column, and the top of the steel support bracket is fixedly connected to the bottom of the connecting ring.

[0009] Furthermore, multiple prefabricated beams are connected to prefabricated columns. A groove is provided on the upper surface of the beam body at one end of the prefabricated beam connected to the prefabricated column. The length of the groove matches the radius of the connecting ring. The connecting ring is embedded in the grooves on the multiple prefabricated beams, and the connecting ring is fixedly connected to the multiple grooves by steel bars.

[0010] Furthermore, an annular frame beam for bearing the restraining force is provided outside the connecting ring, the connecting ring is located inside the annular frame beam, and multiple prefabricated beams pass through the connecting ring and are connected to the annular frame beam. Multiple prefabricated beams are combined with the connecting ring to replace the steel mesh to produce a membrane effect.

[0011] Furthermore, support columns are evenly arranged on the periphery of the annular frame beam, and the prefabricated columns located at the center of the annular frame beam can be arranged or not arranged according to actual needs.

[0012] Compared with the prior art, the advantages of the present invention are as follows: 1. The present invention arranges a steel mesh with tensile properties between the connecting ring and the prefabricated column. When the prefabricated column is damaged, the membrane effect generated by the steel mesh is used to adjust the load transfer between the prefabricated column and the prefabricated beam, thereby delaying the damage of the structure under extreme conditions, avoiding premature shear damage of the components, increasing the stability of the beam-column node, and significantly improving the overall ductility of the frame under extreme damage conditions.

[0013] 2. The present invention improves the lateral stiffness of the structure by arranging the first and second steel grids inside and outside the connecting ring, which can significantly improve the seismic performance of the structure and increase the reliability of the structure.

[0014] 3. The process of the present invention is easy to control, and the construction quality can be well controlled. It can significantly improve the assembly and industrialization degree of concrete structures, facilitate construction, reduce construction difficulty, improve the construction speed and production efficiency of the project, shorten the construction period, and reduce the project cost.

[0015] 4. The connecting ring of the present invention can be embedded in the groove of the prefabricated beam. The prefabricated beam is arranged under the connecting ring to exert the load-bearing and force-transmitting functions of the beam itself, and can also support the deadweight of the connecting ring, so that the connecting ring only has a temporary supporting function when the column is sheared and damaged, and is not subjected to or is subjected to very small forces on a daily basis, thereby ensuring the reliability of the connecting ring in emergencies. Instruction Manual

[0016] Figure 1 It is a structural diagram of the present invention; Figure 2 The overall structural diagram for setting the connection ring and steel grid in the building; Figure 3 Structural drawings of reinforced concrete structures for precast columns, precast beams and connection rings; Figure 4 Structural drawings of precast columns, precast beams and connecting rings for steel structures; Figure 5 Structural diagram for setting steel bar supports at the bottom of the connecting ring; Figure 6 A structural diagram showing a prefabricated beam base at the bottom of the connecting ring; Figure 7 , Figure 8 All of them are structural diagrams that use annular frame beams to provide restraint, and precast beams and connecting rings to form a steel mesh to produce a membrane effect; Fig. 9 This is a structural diagram of setting support columns outside the ring frame beam; Fig.10 This is the structural diagram without prefabricated columns in the above figure; Reference numerals: 1. Precast column; 2. Precast beam; 3. Connecting ring; 4. Steel mesh; 5. First steel grid; 6. Second steel grid; 7. Steel support; 8. Groove; 9. Ring frame beam; 10. Support column. DETAILED DESCRIPTION

[0017] The technical solution of the present invention will be described clearly and completely below. Figure 1 To Attachment Figure 7 , the implementation methods of this patent are described in detail. The following examples are used to illustrate the present invention, but cannot be used to limit the present invention. Example

[0018] like Figure 1 and Figure 2As shown, a node structure of a prefabricated beam 2 and a prefabricated column 1 with punching shear damage resistance includes a prefabricated column 1, a connecting ring 3 and a plurality of prefabricated beams 2, wherein the outer portion of the prefabricated column 1 is sleeved with a connecting ring 3 for bearing a restraining force, and a steel mesh 4 for generating a membrane effect is connected between the connecting ring 3 and the prefabricated column 1; The outside of the connection ring 3 is connected with a plurality of prefabricated beams 2, and the plurality of prefabricated beams 2 act together on the connection ring 3, so that the connection ring 3 is in a tension balance state.

[0019] The connecting ring 3 can be a closed loop structure such as a circle or a regular polygon, and the midpoint of the connecting ring 3 coincides with the axis of the prefabricated column 1. In the present invention, an outer wall can be arranged outside the connecting ring 3 to wrap the prefabricated column 1, so as to protect the connecting ring 3 and the prefabricated column 1, and the prefabricated beam 2 passes through the outer wall and is connected to the connecting ring 3. This embodiment is suitable for buildings with high seismic resistance indicators, such as earthquake-prone areas, air defense fortification buildings, etc., and small and medium-sized buildings with one to two floors and a total area of ​​no more than 800 square meters. Example

[0020] like Figure 1 and Figure 2 As shown, a vertically arranged first steel grid 5 is provided on the inner side of the connecting ring 3, and the first steel grid 5 is arranged circumferentially along the inner side of the connecting ring 3, and the first steel grid 5 is at the same height as the prefabricated column 1. The first steel grid 5 is welded and fixed to the connecting ring 3 or the first steel grid 5 is tied to the steel mesh 4 by a connecting piece, and the connecting piece is a steel hoop ring; a vertically arranged second steel grid 6 is provided on the outer side of the connecting ring 3, and the second steel grid 6 is arranged circumferentially along the outer side of the connecting ring 3, and the second steel grid 6 is at the same height as the prefabricated column 1. The second steel grid 6 is welded and fixed to the connecting ring 3, and the outer wall is located outside the second steel grid 6. Example

[0021] like Figure 3 As shown, the precast beam 2, precast column 1 and connecting ring 3 are all reinforced concrete structures. The precast beam 2 is a basket beam, i.e. a cross beam. The steel mesh 4 structure is a radial structure with the precast column 1 as the origin. A first grouting channel is reserved on the outside of the connecting ring 3. The end of the precast beam 2 is provided with a precast steel bar inserted into the first grouting channel. The multiple steel bars in the precast column 1 are respectively tied and connected with the multiple steel bars of the corresponding steel mesh 4. The inner side of the connecting ring 3 is provided with multiple second grouting channels corresponding to the steel bars of the steel mesh 4. The multiple steel bars are respectively inserted into the corresponding second grouting channels. The cement mortar is injected into the first grouting channel and the second grouting channel and then solidified and fixed.

[0022] like Figure 4As shown, the precast beam 2, precast column 1 and connecting ring 3 are all steel structures, the steel mesh 4 structure is a bidirectional cantilever beam structure, the precast column 1 is a cross-shaped steel column, the precast beam 2 is an I-shaped steel beam, the connecting ring 3 is a steel ring or a concrete ring, the precast column 1 is welded and fixed to the reinforcement head of the steel mesh 4, the steel mesh 4 is welded and fixed to the connecting ring 3, the connecting ring 3 is welded and fixed to the precast beam 2, and the connecting ring 3 and the precast beam 2 can also be fixed by driving steel nails. Example

[0023] like Figure 5 As shown, a plurality of steel support seats 7 for supporting the connecting ring 3 are provided at the bottom of the connecting ring 3. The plurality of steel support seats 7 are evenly arranged along the circumference of the prefabricated column 1. The bottom of the steel support seats 7 is fixedly connected to the surface of the prefabricated column 1, and the top of the steel support seats 7 is fixedly connected to the bottom of the connecting ring 3.

[0024] like Figure 6 As shown, multiple prefabricated beams 2 are connected to the prefabricated column 1. A groove 8 is provided on the upper surface of the beam body at one end of the prefabricated beam 2 connected to the prefabricated column 1. The length of the groove 8 matches the radius of the connecting ring 3. The connecting ring 3 is embedded in the grooves 8 on the multiple prefabricated beams 2. The connecting ring 3 and the multiple grooves 8 are fixedly connected by steel bars. Example

[0025] like Figure 7 and Figure 8 As shown, an annular frame beam 9 for bearing the restraining force is provided outside the connecting ring 3, the connecting ring 3 is located inside the annular frame beam 9, and the plurality of prefabricated beams 2 pass through the connecting ring 3 and are connected to the annular frame beam 9. The plurality of prefabricated beams 2 are combined with the connecting ring 3 to replace the steel mesh 4 to produce a membrane effect.

[0026] The prefabricated beams 2 and columns can be spliced ​​with interfaces or holes can be opened on the prefabricated beams 2 or columns to facilitate the insertion of components, and high-strength bolts can be used for connection, which facilitates the rapid installation and disassembly of the building, realizes the recycling of components, and is conducive to the promotion and application of prefabricated buildings.

[0027] In the above embodiment, the precast beam 2 and the connecting ring 3 are combined to replace the steel mesh 4 to produce the membrane effect. The annular frame beam 9 in the above structure needs to have a sufficient area to ensure that the precast beam 2 and the connecting ring 3 have a certain ductility, so that the precast beam 2 and the connecting ring 3 can be deformed by ductility when subjected to a constraint force, thereby producing a membrane effect. The structure of this embodiment is suitable for buildings that require a larger plane space and a larger column distance, such as large shopping malls, office buildings, underground parking lots, etc.

[0028] like Fig. 9 and Fig.10As shown, support columns 10 are evenly arranged on the periphery of the annular frame beam 9 , and the prefabricated column 1 can be arranged or not arranged at the center of the annular frame beam 9 according to actual needs.

[0029] The above structure is an improvement based on the needs of building space. If the building is a small building, it is impossible to arrange a large number of prefabricated columns 1 to support the building. Therefore, an annular frame beam 9 occupying the entire building plane is set, and multiple supporting columns 10 are evenly distributed on the periphery of the annular frame beam 9 for support. The prefabricated column 1 at the center of the annular frame beam 9 can be set or cancelled according to actual needs.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A node structure of a prefabricated beam (2) and a prefabricated column (1) having a punching shear failure resistance, characterized in that: It comprises a prefabricated column (1), a connecting ring (3) and a plurality of prefabricated beams (2); the outer portion of the prefabricated column (1) is sleeved with a connecting ring (3) for bearing a restraining force; a steel mesh (4) for generating a membrane effect is connected between the connecting ring (3) and the prefabricated column (1); The outside of the connection ring (3) is connected to a plurality of prefabricated beams (2), and the plurality of prefabricated beams (2) act together on the connection ring (3), so that the connection ring (3) is in a tension balance state.

2. The node structure of the prefabricated beam (2) and the prefabricated column (1) with punching shear resistance according to claim 1, characterized in that: The steel mesh (4) structure is a radial structure with the prefabricated column (1) as the origin or a bidirectional cantilever beam structure.

3. The node structure of the prefabricated beam (2) and prefabricated column (1) with punching shear failure resistance according to claim 2, characterized in that: The connecting ring (3) is circular, and the midpoint of the connecting ring (3) coincides with the axis of the prefabricated column (1).

4. The node structure of the prefabricated beam (2) and the prefabricated column (1) with punching shear resistance according to claim 3, characterized in that: The precast beam (2), precast column (1) and connecting ring (3) are all reinforced concrete structures; the precast beam (2) is a basket beam; a first grouting channel is reserved on the outside of the connecting ring (3); a precast steel bar inserted into the first grouting channel is provided at the end of the precast beam (2); a plurality of steel bars in the precast column (1) are respectively tied and connected to a plurality of steel bars of a corresponding steel mesh (4); a plurality of second grouting channels corresponding to the steel bars of the steel mesh (4) are provided on the inside of the connecting ring (3); the plurality of steel bars are respectively inserted into the corresponding second grouting channels.

5. The node structure of the prefabricated beam (2) and prefabricated column (1) with punching shear resistance according to claim 3, characterized in that: The prefabricated beam (2), prefabricated column (1) and connecting ring (3) are all steel structures. The prefabricated column (1) is a cross-shaped steel column, the prefabricated beam (2) is an I-shaped steel beam, and the connecting ring (3) is a steel circular ring. The prefabricated column (1) is fixed to the reinforcing bar head of the steel mesh (4) by welding, the steel mesh (4) is fixed to the connecting ring (3) by welding, and the connecting ring (3) is fixed to the prefabricated beam (2) by welding.

6. The node structure of the prefabricated beam (2) and prefabricated column (1) with punching shear resistance according to claim 3, characterized in that: A first steel grid (5) arranged vertically is provided on the inner side of the connecting ring (3), the first steel grid (5) is arranged circumferentially along the inner side of the connecting ring (3), the first steel grid (5) is at the same height as the prefabricated column (1), the first steel grid (5) is welded and fixed to the connecting ring (3), or the first steel grid (5) is tied to the steel mesh (4) via a connecting piece, the connecting piece is a steel hoop ring or a concrete ring; a second steel grid (6) arranged vertically is provided on the outer side of the connecting ring (3), the second steel grid (6) is arranged circumferentially along the outer side of the connecting ring (3), the second steel grid (6) is at the same height as the prefabricated column (1), and the second steel grid (6) is welded and fixed to the connecting ring (3).

7. The node structure of the prefabricated beam (2) and prefabricated column (1) with punching shear failure resistance according to claim 3, characterized in that: A plurality of steel bar supports (7) for supporting the connecting ring (3) are provided at the bottom of the connecting ring (3); the plurality of steel bar supports (7) are evenly arranged along the circumference of the prefabricated column (1); the bottom of the steel bar support (7) is fixedly connected to the surface of the prefabricated column (1); and the top of the steel bar support (7) is fixedly connected to the bottom of the connecting ring (3).

8. The node structure of the prefabricated beam (2) and prefabricated column (1) with punching shear resistance according to claim 3, characterized in that: A plurality of prefabricated beams (2) are connected to a prefabricated column (1); a groove (8) is provided on the upper surface of the beam body at one end of the prefabricated beam (2) connected to the prefabricated column (1); the length of the groove (8) matches the radius of the connecting ring (3); the connecting ring (3) is embedded in the grooves (8) on the plurality of prefabricated beams (2); and the connecting ring (3) and the plurality of grooves (8) are fixedly connected by steel bars.

9. The node structure of the prefabricated beam (2) and prefabricated column (1) with punching shear failure resistance according to claim 2, characterized in that: An annular frame beam (9) for bearing a restraining force is provided outside the connecting ring (3); the connecting ring (3) is located inside the annular frame beam (9); a plurality of prefabricated beams (2) pass through the connecting ring (3) and are connected to the annular frame beam (9); the plurality of prefabricated beams (2) are combined with the connecting ring (3) to replace the steel mesh (4) to produce a membrane effect.

10. According to the node structure of the prefabricated beam (2) and the prefabricated column (1) with shear resistance performance as described in claim 9, the support columns (10) are evenly arranged on the periphery of the annular frame beam (9), and the prefabricated column (1) located at the center of the annular frame beam (9) can be set or not according to actual needs.

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