Prefabricated steel structure beam-column joints with replaceable hub-type energy dissipation and construction methods

Abstract

This invention relates to a prefabricated beam-column joint structure, and more particularly to a prefabricated steel structure beam-column joint with replaceable hub-type energy dissipation and its construction method. The joint includes a prefabricated steel beam and a prefabricated steel column. Outwardly extending arc-shaped connecting plates are fixed to both sides of the web of one end of the prefabricated steel beam. An arc-shaped connecting plate is fixed to the outer side of the flange of the prefabricated steel column, located between the two arc-shaped connecting plates. The arc-shaped connecting plate is rotatably connected to the arc-shaped connecting plate of the beam end. Gear sleeves are fixed to the outer side of the arc-shaped connecting plates. Hub-type arc-shaped end plates are installed on the flanges of the prefabricated steel column, located outside the corresponding gear sleeves. The hub-type arc-shaped end plates have a circular array of fan-shaped holes, and their inner sides have toothed grooves that mate with the gear sleeves. This beam-column joint achieves functional recoverability while ensuring that the failure modes of the prefabricated steel structure beam-column joint are controllable.

Description

Technical Field

[0001] This invention relates to a prefabricated beam-column joint structure, and more particularly to a prefabricated steel structure beam-column joint with replaceable hub-type energy dissipation and its construction method. Background Technology

[0002] With my country's socio-economic development, the construction industry faces labor shortages and high labor costs. Meanwhile, the drawbacks of traditional on-site casting construction are becoming increasingly apparent, such as severe environmental pollution and the large volume of difficult-to-manage construction waste. Prefabricated steel structures offer advantages such as short construction cycles, energy efficiency, environmental friendliness, and high-quality components, aligning with my country's strategic direction of industrialization and sustainable development in the construction industry, and thus possess significant development potential.

[0003] Compared to cast-in-place structures, prefabricated structures have weaker overall integrity and stiffness, and the mechanical properties of beam-column joints largely determine the structural load-bearing capacity. As key force-transmitting components in prefabricated steel structures, beam-column joints are also their weakest points; failure at these joints can lead to a loss of structural integrity and negatively impact the structure's seismic performance.

[0004] Currently, the beam-column connection forms in prefabricated structures are diverse, and their failure modes are also different. Although the load-bearing capacity and ductility of prefabricated structures can be guaranteed to reach those of cast-in-place structures through reasonable design, the damage development and failure modes of the structure are difficult to control. In addition, severe plasticity occurs at beam-column joints under seismic loading, resulting in excessive residual deformation of the structure. Post-earthquake repair is difficult and costly, making it difficult to achieve rapid restoration of structural function after an earthquake, which is detrimental to the sustainable development of engineering structures.

[0005] Therefore, it is necessary to develop new beam-column joint forms to improve the integrity and seismic performance of prefabricated structures, while also improving the post-earthquake recoverability of the structure. Summary of the Invention

[0006] The purpose of this invention is to provide a prefabricated steel structure beam-column joint with replaceable hub-type energy dissipation and a construction method thereof. This beam-column joint achieves functional recoverability of the prefabricated steel structure beam-column joint while ensuring that the failure modes of the prefabricated steel structure beam-column joint are controllable.

[0007] The technical solution of the present invention is as follows: a prefabricated steel structure beam-column joint with replaceable hub-type energy dissipation includes a prefabricated steel beam and a prefabricated steel column. An outwardly extending arc-shaped connecting plate is fixed to both sides of the web of one end of the prefabricated steel beam. An arc-shaped connecting plate is fixed to the outer side of the flange of the prefabricated steel column, located between the two arc-shaped connecting plates at the beam ends. The arc-shaped connecting plate at the column end is rotatably connected to the arc-shaped connecting plate at the beam end. Gear sleeves are fixed to the outer side of the arc-shaped connecting plates at the beam ends. Hub-type arc-shaped end plates are installed on the flanges of the prefabricated steel column. The hub-type arc-shaped end plates are located outside the corresponding gear sleeves. A circular array of fan-shaped holes is provided on the hub-type arc-shaped end plates. A toothed groove that mates with the gear sleeve is provided on the inner side of the hub-type arc-shaped end plates.

[0008] Furthermore, the precast steel beam is an I-shaped steel beam; the precast steel column is an H-shaped steel column.

[0009] Furthermore, bolt holes are provided at intervals on one end of the web of the precast steel beam, and bolt holes are provided on one end of the arc-shaped connecting plate at the beam end. The arc-shaped connecting plate at the beam end is connected to the web of the beam by bolts passing through the bolt holes.

[0010] Furthermore, the column end arc-shaped connecting plate is welded to the wing plate of the precast steel column, and a pin is rotatably connected to the column end arc-shaped connecting plate. The two ends of the pin pass through the beam end arc-shaped connecting plate respectively. A groove for the end of the pin to extend into is provided on the side of the gear sleeve that connects to the beam end arc-shaped connecting plate.

[0011] Furthermore, the center of the pin is coaxial with the center of the arc-shaped connection at the column end, the center of the arc-shaped connection plate at the beam end, the center of the gear sleeve, and the center of the tooth groove.

[0012] Furthermore, the toothed groove is disposed within the fan-shaped holes arranged in a circular array, and the axis of the toothed groove is coaxial with the axis of the fan-shaped holes arranged in a circular array.

[0013] Furthermore, the end of the gear sleeve that connects to the arc-shaped connecting plate at the beam end has a central section, and the end of the gear sleeve that mates with the arc-shaped end plate of the hub has a toothed section. A number of toothed grooves are correspondingly provided in the toothed groove, and the depth of the toothed groove does not exceed the thickness of the arc-shaped end plate of the hub.

[0014] Furthermore, the hub-type arc-shaped end plate is connected to the flange of the precast steel column via L-shaped angle steel stiffeners and bolted connections.

[0015] Furthermore, in the area where the precast steel column connects to the precast steel beam, and between the two flanges of the precast steel column, steel column stiffening ribs parallel to the column web are welded.

[0016] A construction method for prefabricated steel structure beam-column joints with replaceable hub-type energy dissipation includes the following steps:

[0017] (1) Weld steel column stiffening ribs on both sides parallel to the web of the column between the two flanges inside the precast steel column, wherein the bolt holes on the flanges of the precast steel column are staggered from the stiffening ribs of the steel column.

[0018] (2) After the stiffening ribs of the steel column are welded, the arc-shaped connecting plate at the column end is welded to the outer side of the flange of the precast steel column.

[0019] (3) After the column end arc-shaped connecting plate is welded, the beam end arc-shaped connecting plate is connected to both sides of the web of the precast steel beam, and the column end arc-shaped connecting plate is sandwiched between the two beam end arc-shaped connecting plates. A pin is inserted into the center hole of the column end arc-shaped connecting plate and the beam end arc-shaped connecting plate to form a rotating connection. The two ends of the pin protrude from the beam end arc-shaped connecting plate respectively.

[0020] (4) After the pin is installed, a gear sleeve is set on the outside of the arc-shaped connecting plate at the beam end, and the end of the pin is embedded in the corresponding gear sleeve. The gear sleeve is then welded to the corresponding arc-shaped connecting plate at the beam end.

[0021] (5) After the gear sleeve is welded, the gear of the gear sleeve is embedded into the gear groove of the hub-type arc-shaped end plate;

[0022] (6) Connect the hub-type arc end plate and the L-shaped angle steel stiffening rib to the flange on the outer side of the wing plate on one side of the precast steel column using bolts, and the construction assembly is completed.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] (1) The construction process of this invention is a dry construction process, which improves the appearance of the facade. The entire construction process is clean and tidy. Most of the interconnections between components are bolted, which makes construction convenient and ensures quality.

[0025] (2) The present invention uses a steel structure energy dissipation connection to process a ring array of fan-shaped holes on the hub-type arc end plate, thereby transferring the position of the plastic hinge from the H-shaped steel beam-column node to the hub-type arc end plate at the beam-column connection. This causes the hub-type arc end plate to fail before other parts, ensuring the safety of the node core area and effectively improving the seismic performance of the structure.

[0026] (3) The present invention creatively transforms the connection between the hub-type arc end plate and the gear sleeve into the form of gear embedded in the slot, which is not only easy to install during construction, but also extremely convenient in the process of replacing the hub-type arc end plate; the hub-type arc end plate and the column plane are connected by L-shaped angle steel stiffening ribs and reinforced with bolts, realizing easy repair and quick replacement of the energy-consuming connection after damage, reducing material consumption, reducing repair costs, improving construction efficiency, and having a certain degree of economy, while greatly reducing safety risks.

[0027] Figure 1 This is a schematic diagram of the prefabricated steel structure beam-column joint structure with replaceable hub-type energy dissipation according to the present invention.

[0028] Figure 2 The post-earthquake damage shape of the prefabricated steel structure beam-column joint with replaceable hub-type energy dissipation according to the present invention;

[0029] Figure 3 This is an exploded view of the present invention;

[0030] Figure 4 This is a schematic diagram of the hub-type arc-shaped end plate structure of the present invention;

[0031] Figure 5 This is a schematic diagram of the structure of the gear sleeve of the present invention;

[0032] Figure 6 This is a schematic diagram of the installation structure of the stiffening rib plate of the present invention;

[0033] Figure 7 This is a schematic diagram of the connection of the arc-shaped connecting plate on the column flange of the present invention;

[0034] Figure 8 This is a schematic diagram showing the connection of the arc-shaped connecting plate at the web of the beam and the embedding of the pin in this invention.

[0035] Figure 9 This is a schematic diagram of the connection of the gear sleeve of the present invention;

[0036] Figure 10 This is a schematic diagram of the connection of the hub-type arc-shaped end plate of the present invention;

[0037] Figure 11 This is a schematic diagram of the connection of the L-shaped angle steel stiffening ribs of the present invention;

[0038] In the diagram: 10-Precast steel beam; 11-Bolt hole; 20-Precast steel column; 21-Bolt hole; 22-Steel column stiffening rib; 30-Beam end arc-shaped connecting plate; 31-Bolt hole; 40-Column end arc-shaped connecting plate; 50-Gear sleeve; 51-Groove; 52-Central section; 53-Toothed section; 60-Hub-type arc-shaped end plate; 61-Fan-shaped hole; 62-Toothed groove; 63-Toothed groove; 64-Bolt hole; 70-Pin; 80-L-shaped angle steel stiffening rib. Detailed Implementation

[0039] To make the above features and advantages of the present invention more readily understood, specific embodiments are described below in conjunction with the accompanying drawings, but the present invention is not limited thereto.

[0040] refer to Figures 1 to 11

[0041] A prefabricated steel structure beam-column joint with replaceable hub-type energy dissipation includes a prefabricated steel beam 10 and a prefabricated steel column 20. An outwardly extending arc-shaped connecting plate 30 is fixed to both sides of the web of one end of the prefabricated steel beam. An arc-shaped connecting plate 40 located between the two arc-shaped connecting plates is fixed to the outer side of the flange of the prefabricated steel column. The arc-shaped connecting plate is rotatably connected to the arc-shaped connecting plate of the beam end. Gear sleeves 50 are fixed to the outer side of the arc-shaped connecting plates of the beam end. Hub-type arc-shaped end plates 60 are installed on the flanges of the prefabricated steel column. The hub-type arc-shaped end plates are located outside the corresponding gear sleeves. The hub-type arc-shaped end plates have a circular array of fan-shaped holes 61 to form energy dissipation holes. The inner side of the hub-type arc-shaped end plates has toothed grooves 62 that mate with the gear sleeves, thereby transmitting bending moment through the compression of the gears and the grooves.

[0042] In this embodiment, the precast steel beam is an I-shaped steel beam; the precast steel column is an H-shaped steel column.

[0043] In this embodiment, bolt holes 11 are provided at intervals on one end of the web of the precast steel beam, and bolt holes 31 are provided on one end of the arc-shaped connecting plate at the beam end. The arc-shaped connecting plate at the beam end is connected to the web of the beam by bolts passing through the bolt holes and nuts.

[0044] In this embodiment, the column-end arc-shaped connecting plate is welded to the flange of the precast steel column. A pin 70 is rotatably connected to the column-end arc-shaped connecting plate, with both ends of the pin passing through the beam-end arc-shaped connecting plate, thereby ensuring the shear force transmission of the prefabricated beam-column joint and improving the joint's rotational capacity. A groove 51 for the pin end to extend into is provided on the side of the gear sleeve that connects to the beam-end arc-shaped connecting plate.

[0045] In this embodiment, the column-end arc-shaped connecting plate is located at the middle position of the two hub-type arc-shaped end plates.

[0046] In this embodiment, the center of the pin shaft is coaxial with the center of the arc-shaped connection at the column end, the center of the arc-shaped connection plate at the beam end, the center of the gear sleeve, and the center of the tooth groove.

[0047] In this embodiment, the toothed groove is disposed inside the fan-shaped holes arranged in a circular array, and the axis of the toothed groove is coaxial with the axis of the fan-shaped holes arranged in a circular array.

[0048] In this embodiment, the end of the gear sleeve connected to the arc-shaped connecting plate at the beam end is a central section 52, and the end of the gear sleeve that mates with the hub-type arc-shaped end plate is a toothed section 53. The toothed groove is provided with a plurality of toothed grooves 63 that mate with the convex teeth of the toothed sleeve. The depth of the toothed groove does not exceed the thickness of the hub-type arc-shaped end plate.

[0049] In this embodiment, bolt holes 21 are provided at intervals on the flange of the wing plate located in the area where the precast steel column and the precast steel beam are connected, and bolt holes 64 are provided at intervals on the hub-type arc-shaped end plate. The hub-type arc-shaped end plate is connected to the flange of the precast steel column by bolts through L-shaped angle steel stiffening ribs 80.

[0050] In this embodiment, steel column stiffening ribs 22 parallel to the column web are welded in the area where the precast steel column connects to the precast steel beam and between the two flanges of the precast steel column, so as to ensure that both flanges of the precast steel column can withstand the load transmitted by the energy dissipation connection.

[0051] The post-earthquake damage shapes of the prefabricated steel structure beam-column joints with replaceable hub-type energy dissipation connections are as follows: Figure 2 As shown. The specific working mechanism is as follows:

[0052] Under seismic loading, the energy generated by the relative rotation between beams and columns causes the arc-shaped connecting plates at the beam ends to rotate relative to the arc-shaped connecting plates at the column ends. The two gear sleeves then convert this energy into torque, which is then transmitted through the gear slots by the two hub-type arc-shaped end plates. Due to the circularly arranged fan-shaped holes on the hub-type arc-shaped end plates, the energy generated by the torque on the gear sleeves is converted into lateral shear force on the small steel columns between the holes, causing plastic deformation of the small steel columns along the direction of rotation. Figure 2 As shown. The shear force of the entire energy-dissipating connection, namely the lateral shear force generated by the relative lateral displacement of the arc-shaped connection plate at the beam end relative to the arc-shaped connection plate at the column end, is borne by the central pin.

[0053] The above-mentioned construction method for prefabricated steel structure beam-column joints with replaceable hub-type energy dissipation includes the following steps:

[0054] (1) Stiffening ribs 22 of the steel column are welded to both sides of the precast steel column 20, parallel to the web plate, to ensure that both flanges of the steel column can withstand the load transmitted by the energy dissipation connection. Figure 6 As shown; the bolt holes on the precast steel column flange are staggered from the stiffening ribs 22 of the steel column.

[0055] (2) After the stiffening ribs 22 of the steel column are welded, the arc-shaped connecting plate 40 at the column end is welded to the outer side of the flange of the precast steel column 20, such as Figure 7 As shown;

[0056] (3) After the column-end arc-shaped connecting plate 40 is welded, the beam-end arc-shaped connecting plate 30 is then bolted to both sides of the web of the precast steel beam 10. The column-end arc-shaped connecting plate 40 is sandwiched between the two beam-end arc-shaped connecting plates 30. A pin 70 is inserted into the central hole of the column-end arc-shaped connecting plate 40 and the beam-end arc-shaped connecting plate 30 to form a rotating connection. The two ends of the pin 70 protrude from the beam-end arc-shaped connecting plate 50, as shown below. Figure 8 As shown;

[0057] (4) After the pin 70 is installed, a gear sleeve 50 is respectively set on the outer side of the arc-shaped connecting plate 30 at the beam end, and the end of the pin 70 is embedded in the groove 51 of the corresponding gear sleeve 50. The gear sleeve 50 is then welded to the corresponding arc-shaped connecting plate 30 at the beam end to form a structure that encloses the pin 70 inside, such as... Figure 9 As shown;

[0058] (5) After the gear sleeve 50 is welded, the gear of the gear sleeve 50 is embedded into the gear groove 62 of the hub-type arc-shaped end plate 60, such as... Figure 10 As shown;

[0059] (6) The hub-type arc end plate 60 and the L-shaped angle steel stiffening rib 80 are connected to the flange of the outer side of the wing plate on one side of the precast steel column 20 by bolts, and the construction and assembly are completed.

[0060] The method for post-earthquake repair and replacement of the prefabricated steel structure beam-column joints with replaceable hub-type energy dissipation is as follows:

[0061] Under seismic loading, the prefabricated steel structure beam-column joint with replaceable hub-type energy dissipation rotates around the pin 70, using the compression between gears and gear slots to transmit bending moment. By weakening the hub-type arc-shaped end plate 60 as an energy dissipation element, the deformation of the beam-column joint can be mainly concentrated on the hub-type arc-shaped end plate 60. After an earthquake, the prefabricated steel structure beam-column joint with replaceable hub-type energy dissipation connection will only experience severe plastic deformation in the hub-type arc-shaped end plate 60, while other components remain intact. When repairing the beam-column joint to restore its function, it is only necessary to remove the bolts on the L-shaped angle steel stiffener 80, remove the two severely plastic hub-type arc-shaped end plates 60, embed the new hub-type arc-shaped end plates 60, and then reinstall the L-shaped angle steel stiffener 80 and tighten the bolts. This completes the post-earthquake repair and replacement, which is simple, convenient, and highly efficient. During the replacement process, due to the support of the arc-shaped connecting plates at the column end and the arc-shaped connecting plates at the two beam ends, the precast steel beam 10 will not detach from the precast steel column 20 after the hub-type arc-shaped end plate 60 is removed.

[0062] The above description is only a preferred embodiment of the present invention. For those skilled in the art, designing different forms of prefabricated steel structure beam-column joints with replaceable hub-type energy dissipation and construction methods according to the teachings of the present invention does not require creative labor. All equivalent changes, modifications, substitutions and variations made in accordance with the scope of the patent application of the present invention without departing from the principles and spirit of the present invention shall be covered by the present invention.

Claims

1. A prefabricated steel structure beam-column joint with replaceable hub energy dissipation, comprising a prefabricated steel beam and a prefabricated steel column, characterized in that, The web of the precast steel beam is provided with bolt holes at one end, and the one end of the arc-shaped connecting plate is provided with bolt holes correspondingly, and the arc-shaped connecting plate is connected with the web through the bolt.

2. The prefabricated steel structure beam-column joint with replaceable hub-type energy dissipation according to claim 1, characterized in that, The precast steel beam is a steel beam with an I-shaped cross section, and the precast steel column is a steel column with an H-shaped cross section.

3. The prefabricated steel structure beam-column joint with replaceable hub-type energy dissipation according to claim 1 or 2, characterized in that, The web of the precast steel beam is provided with bolt holes at one end, and the one end of the arc-shaped connecting plate is provided with bolt holes correspondingly, and the arc-shaped connecting plate is connected with the web through the bolt.

4. The prefabricated steel structure beam-column joint with replaceable hub-type energy dissipation according to claim 1, characterized in that, The axis of the pin shaft is coaxial with the center of the arc-shaped connecting plate, the center of the arc-shaped connecting plate, the axis of the gear sleeve and the axis of the tooth-shaped groove.

5. The prefabricated steel structure beam-column joint with replaceable hub-type energy dissipation according to claim 1, characterized in that, The hub-shaped arc-shaped end plate is connected to the flange of the precast steel column through the L-shaped angle steel stiffener and the bolt connector.

6. The prefabricated steel structure beam-column joint with replaceable hub-type energy dissipation according to claim 1 or 5, characterized in that, The precast steel column is provided with steel column stiffening rib plates parallel to the web of the column between the two flanges.

7. A construction method applied to the energy-dissipated assembled steel structure beam-column joint with replaceable hub as claimed in claim 1, characterized in that, The steps include: (1) The steel column stiffening rib plates parallel to the web of the column are welded between the two flanges in the precast steel column, and the bolt holes on the flanges of the precast steel column are staggered with the steel column stiffening rib plates; (2) After the steel column stiffening rib plates are welded, the arc-shaped connecting plate is welded to the outer side of the flanges of the precast steel column; (3) After the arc-shaped connecting plate is welded, the arc-shaped connecting plate is connected to the web of the precast steel beam, and the arc-shaped connecting plate is clamped between the two arc-shaped connecting plates, and a pin shaft is inserted into the center holes of the arc-shaped connecting plates to form a rotating connection, and the two ends of the pin shaft protrude from the arc-shaped connecting plates. (4) After the pin shaft is installed, a gear sleeve is arranged outside the beam end arc-shaped connecting plate, the end of the pin shaft is embedded into the corresponding gear sleeve, and the gear sleeve is welded with the corresponding beam end arc-shaped connecting plate; (5) After the gear sleeve is welded, the gear of the gear sleeve is embedded into the gear groove of the wheel hub type arc-shaped end plate; (6) The wheel hub type arc-shaped end plate and the L-shaped angle steel stiffening rib are connected to the flange on the outer side surface of the wing plate on one side of the prefabricated steel column by using a bolt connecting piece, and the construction and assembly are completed.

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