Post-tensioned prestressed self-resetting fabricated RCS beam-column joint

Abstract

The utility model discloses a post-tensioned prestressing self-resetting assembly type RCS beam column joint which comprises a precast concrete column, a steel beam, a first lug plate, a second lug plate, a pin shaft, a shearing screw rod, a prestressing steel bar and a prestressing anchorage device. One end of the first lug plate is fixedly connected with the prefabricated concrete column, the other end of the first lug plate is movably connected with the second lug plate through a pin shaft and a shearing screw, and the other end of the second lug plate is fixedly connected with the steel beam. And the other end is anchored and connected with the steel beam through a pre-stressed anchorage device after being tensioned. According to the assembly type RCS beam column joint, energy can be dissipated through plastic deformation generated by the bending and shearing action of the shearing screws under the earthquake action, the joint is endowed with the good self-resetting capacity through the tensioned prestressed tendons, and the anti-seismic performance and the post-earthquake repairable performance of the assembly type RCS beam column joint can be remarkably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of building materials, in particular to a post-tensioned prestressed self-resetting assembled RCS beam-column node. Background Art

[0002] The reinforced concrete column and steel beam (RCS) hybrid structure has the characteristics of "low cost and high efficiency". It is a new type of prefabricated structural system that can give full play to the structural and economic advantages of steel and concrete materials. Through reasonable design, the node connection of the RCS structure can show semi-rigid characteristics similar to the semi-rigid connection of steel structure beams and columns, so that this type of node has the advantages of good ductility, strong energy dissipation capacity, and easy repair. The use of prefabricated RCS structure not only has the advantages of ordinary RCS structure, but also has the advantages of fast construction, high quality, and environmental protection. Therefore, the research on prefabricated RCS structure is of great significance. The design connection concept of the node in the RCS structure is related to the overall strength, stiffness and seismic performance of the RCS structure.

[0003] For this reason, more and more scholars at home and abroad have begun to pay attention to the performance of RCS node recoverable structures and conduct relevant research, proposing various technical measures or new structural systems, including the use of self-reset structural technology, replaceable concentrated damage energy-absorbing components, etc. Due to the differences in energy consumption and self-reset mechanisms, the energy consumption capacity and post-earthquake recoverable performance of different RCS nodes will be greatly affected, thereby affecting the overall seismic resistance of the RCS structure.

[0004] Therefore, it is of great significance for technical personnel in this field to optimize the energy consumption and self-reset function of the RCS node and further improve the seismic performance of the RCS prefabricated beam-column node. Utility Model Content

[0005] To achieve the above-mentioned purpose, the utility model provides a post-tensioned prestressed self-resetting assembled RCS beam-column node.

[0006] The technical solution adopted by the utility model is:

[0007] A post-tensioned prestressed self-resetting assembled RCS beam-column node comprises a precast concrete column, a steel beam, a first ear plate, a second ear plate, a pin shaft, a shear screw, a prestressed steel bar and a prestressed anchor; one end of the first ear plate is fixedly connected to the precast concrete column, and the other end is movably connected to the second ear plate through the pin shaft and the shear screw, and the other end of the second ear plate is fixedly connected to the steel beam, and a prestressed steel bar is arranged between the precast concrete column and the steel beam, one end of the prestressed steel bar is connected to the precast concrete column, and the other end is tensioned and anchored to the steel beam through the prestressed anchor.

[0008] Further, the prestressed steel bars are connected to the web of the steel beam.

[0009] Further, the prestressed steel bars are connected to the steel beam flanges.

[0010] Furthermore, the steel beam is a section steel beam or a composite beam.

[0011] Furthermore, the prestressed steel bars are precision-rolled threaded steel bars, steel strands or prestressed steel bars.

[0012] Furthermore, a hole for installing prestressed steel bars is reserved in the precast concrete column.

[0013] Furthermore, there are a plurality of prestressed steel bars which are evenly arranged between the precast concrete columns and the steel beams.

[0014] Furthermore, the ear plate 1 is connected to the precast concrete column through an embedded part, the embedded part is embedded in the precast concrete column when the precast concrete column is cast, and the ear plate 1 is welded to the embedded part.

[0015] Furthermore, a pin hole is provided at one end where ear plate one and ear plate two are connected, and a plurality of screw holes surround the pin hole. The pin can rotatably pass through the pin hole to connect ear plate one and ear plate two, and the shear screw passes through the screw hole and is pre-tightened by a bolt.

[0016] Furthermore, at least one ear plate 1 and at least one ear plate 2 are provided.

[0017] Beneficial effects of the utility model:

[0018] 1. By combining node assembly components with node energy-consuming parts, the node form is optimized, the node construction method is simplified, and the application and promotion of prefabricated components are facilitated.

[0019] 2. By using shear screws to connect the two ear plates, the shear screws can produce plastic deformation to absorb seismic energy during an earthquake. By setting prestressed steel bars between the steel beams and the precast concrete columns, the prestressed steel bars will be subjected to a certain tension after being tensioned. This tension can, to a certain extent, cause them to produce a certain displacement after being subjected to external loads, and when the external load is reduced or disappears, the strain generated by the internal prestress can restore the original position, thereby enabling the node to achieve a certain degree of self-reset function. After the earthquake, only the damaged shear screws need to be replaced to restore the function.

[0020] 3. In actual engineering applications, node parameters can be determined based on seismic performance design indicators; seismic performance can be improved by changing the diameter of the energy absorption rod, the material of the energy absorption rod, the diameter of the pin, the distance from the pin to the center of the energy absorption rod, the distance between the ear plates, the prestressing force of the prestressed steel bars, and the number and spacing of the prestressed steel bars to meet the seismic design requirements of the actual project.

[0021] 4. This application is simple and convenient, and can achieve the goal of dissipating energy at the epicenter and performing lossless repair after the earthquake. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a front view of the post-tensioned prestressed self-resetting assembled RCS beam-column node of Example 1.

[0023] Figure 2 for Figure 1 Top view of the .

[0024] Figure 3 for Figure 1 Side view of.

[0025] Figure 4 This is a front view of the post-tensioned prestressed self-resetting assembled RCS beam-column node of Example 2.

[0026] Figure 5 for Figure 4 Top view of the .

[0027] Figure 6 for Figure 4 Side view of.

[0028] Figure 7 This is a structural diagram of the ear plate.

[0029] Figure 8 This is the structural diagram of ear plate 2.

[0030] Fig. 9 This is the structural diagram of the connection between ear plate 1 and embedded parts.

[0031] Figure numerals: 1. Precast concrete column; 2. Steel beam; 21. End plate; 3. Ear plate one; 31. Pin hole of ear plate one; 32. Shear screw hole of ear plate one; 4. Ear plate two; 41. Pin hole of ear plate two; 42. Shear screw hole of ear plate two; 5. Pin; 6. Shear screw; 7. Prestressed steel bar; 8. Prestressed anchor; 9. Web plate; 12. Embedded parts. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings and a preferred implementation manner.

[0033] Example 1

[0034] See also Figure 1-Figure 3 and Figure 7-Figure 9The present embodiment provides a post-tensioned prestressed self-resetting assembled RCS beam-column node, including a precast concrete column 1, two steel beams 2, 6 ear plates 1 3, 4 ear plates 2 4, 2 pins 5, 16 shear screws 6, 8 prestressed steel bars 7 and 8 prestressed anchors 8.

[0035] In this embodiment, the embedded part 12 is made of H-shaped steel, and the H-shaped steel is arranged vertically. Six ear plates 13 are symmetrically welded to the two sides of the embedded part 12 in groups of three. A spacing for accommodating the ear plate 2 4 is set between two adjacent ear plates 13, and the spacing is greater than the thickness of the ear plate 2 4. In specific implementation, the ear plate 13 is a flat steel plate with an arc-shaped end and a straight end. The straight end surface of the ear plate 13 is vertically welded to the two sides of the H-shaped steel to form an embedded component. A pin hole 31 and eight screw holes 32 are provided at the arc-shaped end of the ear plate 13, and the eight screw holes 32 surround the pin hole 31.

[0036] The precast concrete column 1 is a reinforced concrete structure. During pouring, the embedded components are embedded in the precast concrete column 1 for positioning, and then a reserved channel for the prestressed steel bars 7 is set in the precast concrete column 1 using a PVC pipe. The reserved channels should meet the requirements of the "Design Code for Prestressed Concrete Structures": the horizontal clear distance between channels in precast components should not be less than 1 times the channel diameter, 1.25 times the coarse aggregate particle size, and 50 mm, whichever is greater. The clear distance from the channel to the edge of the component should not be less than 30 mm, and should not be less than 50% of the channel diameter; the inner diameter of the reserved channel should be 10 mm to 20 mm larger than the outer diameter of the prestressed tendon, and the cross-sectional area of ​​the channel should be (3.0 to 4.0) times the cross-sectional area of ​​the prestressed tendon.

[0037] In this embodiment, the steel beam 2 is made of I-beam, and end plates 21 are provided at both ends of the steel beam 2, and a web plate 9 is provided at one end close to the outer end plate. Four through holes are provided on the end plate 21 and the web plate 9 for passing the prestressed steel bars 7. In other embodiments, the steel beam 2 may also be a composite beam, or a new material profile beam such as FRP.

[0038] Four ear plates 2 4 are symmetrically welded in groups of two on the end plates 21 of the two steel beams 2. In specific implementation, the ear plate 2 4 is a flat steel plate with an arc-shaped end and a straight-line end. The straight-line end surface of the ear plate 2 4 is vertically welded to the side surface of the I-beam. A pin hole 41 and eight screw holes 42 are provided at the arc-shaped end of the ear plate 2 4, and the eight screw holes 42 surround the pin hole 41.

[0039] During assembly, the end of the ear plate 2 4 with an arc is inserted between the two ear plates 1 3, the pin hole 41 corresponds to the pin hole 31, the 8 screw holes 42 and the 8 screw holes 32 correspond one by one, the pins 5 are passed through the pin holes 41 and the pin holes 31, the shear screws 6 are passed through the 8 screw holes 42 and the 8 screw holes 32 one by one and pre-tightened by bolts, so that the ear plate 2 4 and the ear plate 1 3 can be movably connected; one end of the prestressed steel bar 7 passes through the reserved channel of the precast concrete column 1, and the other end passes through the through hole on the steel beam 2, and after tensioning, it is anchored on the outer end plate of the steel beam 2 through the prestressed anchor 8.

[0040] The pin-ear plate rotation structure shall comply with the relevant provisions of the "Steel Structure Design Standard GB50017-2017".

[0041] The material of the shear screw 6 is preferably a steel with a low yield point and high ductility, such as LYP225, BLP225, LYP235 or LYP160, and the diameter of the shear screw is 10-30 mm to ensure that the node has a better energy dissipation capacity.

[0042] Prestressed anchor 8 should comply with the relevant provisions of the current national standards "Anchors, clamps and connectors for prestressed tendons" GB / T14370 and "Technical Code for Application of Anchors, Clamps and Connectors for Prestressed Reinforcement" JGJ85.

[0043] The prestressed steel bars 7 are materials and components capable of providing prestress, such as prestressed steel strands, prestressed steel rods, SMA strands, and SMA rods.

[0044] Example 2

[0045] See also Figure 4-Figure 6 The only difference between this embodiment and embodiment 1 is that there are 4 ear plates 3, 2 ear plates 4, one end of the prestressed steel bar 7 passes through the reserved channel of the precast concrete column 1, and the other end is tensioned and anchored on the upper and lower flanges of the steel beam 2 through the prestressed anchor 8.

[0046] The above is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention, and these improvements and modifications are also within the protection scope of the present invention.

Claims

1. A post-tensioned prestressed self-resetting assembled RCS beam-column node, characterized in that: The invention comprises a precast concrete column (1), a steel beam (2), a first ear plate (3), a second ear plate (4), a pin shaft (5), a shear screw (6), a prestressed steel bar (7) and a prestressed anchor (8); one end of the first ear plate (3) is fixedly connected to the precast concrete column (1), and the other end is movably connected to the second ear plate (4) through the pin shaft (5) and the shear screw (6); the other end of the second ear plate (4) is fixedly connected to the steel beam (2); a prestressed steel bar (7) is arranged between the precast concrete column (1) and the steel beam (2); one end of the prestressed steel bar (7) is connected to the precast concrete column (1), and the other end is tensioned and then anchored to the steel beam (2) through the prestressed anchor (8).

2. A post-tensioned prestressed self-resetting assembled RCS beam-column node according to claim 1, characterized in that: The prestressed steel bars (7) are connected to the web of the steel beam (2).

3. The post-tensioned prestressed self-resetting assembled RCS beam-column node according to claim 1 is characterized in that: The prestressed steel bars (7) are connected to the flanges of the steel beams (2).

4. The post-tensioned prestressed self-resetting assembled RCS beam-column node according to claim 1, characterized in that: The steel beam (2) is a profiled steel beam or a composite beam.

5. The post-tensioned prestressed self-resetting assembled RCS beam-column node according to claim 1, characterized in that: The prestressed steel bar (7) is a precision-rolled threaded steel bar, a steel strand or a prestressed steel bar.

6. The post-tensioned prestressed self-resetting assembled RCS beam-column node according to claim 1, characterized in that: A hole for installing prestressed steel bars (7) is reserved in the precast concrete column (1).

7. The post-tensioned prestressed self-resetting assembled RCS beam-column node according to claim 1, characterized in that: There are a plurality of prestressed steel bars (7) which are evenly arranged between the precast concrete column (1) and the steel beam (2).

8. The post-tensioned prestressed self-resetting assembled RCS beam-column node according to claim 1, characterized in that: The ear plate 1 (3) is connected to the precast concrete column (1) through an embedded part (12); the embedded part (12) is embedded in the precast concrete column (1) when the precast concrete column (1) is cast; and the ear plate 1 (3) is welded to the embedded part (12).

9. The post-tensioned prestressed self-resetting assembled RCS beam-column node according to claim 1, characterized in that: A pin hole is provided at one end of the connecting ear plate 1 (3) and the ear plate 2 (4), and a plurality of screw holes surround the pin hole. A pin (5) rotatably passes through the pin hole to connect the ear plate 1 (3) and the ear plate 2 (4), and a shear screw (6) passes through the screw hole and is pre-tightened by a bolt.

10. The post-tensioned prestressed self-resetting assembled RCS beam-column node according to claim 1, characterized in that: At least one ear plate 1 (3) and at least one ear plate 2 (4) are provided.

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