Function-recoverable flange wave type I-shaped steel joint connecting device

Abstract

The invention relates to a function-recoverable flange wave type I-shaped steel joint connecting device which comprises a main beam, a cross beam, a column end connecting piece and a pair of first connecting plates, one end of the column end connecting piece is connected with the main beam, and two flanges at the end, away from the main beam, of the column end connecting piece are bent oppositely to form a first bend; two flanges at one end of the cross beam are oppositely bent to form a second bend, the outer edge of the second bend is attached to the outer edge of the first bend, the first connecting plate is arranged between the column end connecting piece and the cross beam, and the first connecting plate is attached to the column end connecting piece and the flange side of the cross beam; and a second connecting plate is also arranged between the column end connecting piece and the cross beam. According to the node connecting device, wave starting is carried out above and below the original flange welding position, and the energy dissipation capacity and the anti-seismic property of the node can be effectively improved. The node damage position is controlled at the preset connecting piece part, and after the connecting piece is damaged, the node body is still intact and has certain bearing capacity.

Description

Technical Field

[0001] This invention relates to the fields of building technology and structural engineering technology, and in particular to a functionally recoverable flange-wave-shaped I-beam joint connection device. Background Technology

[0002] Industrial buildings are structures that provide physical space for various production activities, including factories, warehouses, and power facilities. To meet the large span requirements of industrial buildings, steel structures are often used in their design. I-beams, as an important component of steel structures, have superior bending and shear resistance compared to reinforced concrete beams, playing a crucial role in the entire structure.

[0003] The connection between I-beams and steel columns in steel structures is particularly important. The common connection method for I-beams in this connection is welding the upper and lower flanges of the I-beam and bolting the web of the I-beam. This connection method can meet the stress mode under static conditions, but under seismic loading, it often has poor energy dissipation capacity, stress concentration is prone to occur at the weld, and the welds of steel structures often suffer brittle failure due to substandard quality. This causes the structure to fail prematurely before it can fully perform its function. After the structure fails, it will produce large deformations, and it is difficult to restore the entire building structure. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the existing steel structure connection method, which has poor seismic performance and is difficult to restore after an earthquake.

[0005] To address the aforementioned technical problems, this invention provides a functionally recoverable flange-wave-shaped I-beam node connection device, comprising: a main beam, a crossbeam, a column end connector, and a pair of first connecting plates. The cross-sections of the main beam, crossbeam, and column end connector are all I-beam structures. One end of the column end connector is connected to the main beam, and the two flanges of the end of the column end connector away from the main beam are bent relative to each other to form a first bend. The two flanges of one end of the crossbeam are bent relative to each other to form a second bend, and the outer edge of the second bend is abutted against the outer edge of the first bend. The first connecting plates are disposed between the column end connector and the crossbeam, and the first connecting plates are abutted against the flange sides of the column end connector and the crossbeam. A second connecting plate is also disposed between the column end connector and the crossbeam, and the second connecting plate is abutted against one side of the web of the column end connector and the web of the crossbeam.

[0006] In one embodiment of the present invention, the first connecting plate is detachably connected to the column end connector and the crossbeam by a first bolt.

[0007] In one embodiment of the present invention, the surface of the first connecting plate is provided with a plurality of first connecting holes, and the surfaces of the column end connector and the flange of the crossbeam are provided with second connecting holes that cooperate with the first connecting holes.

[0008] In one embodiment of the present invention, both the first connecting hole and the second connecting hole are circular through holes.

[0009] In one embodiment of the present invention, the first connecting hole is an elongated through hole, the second connecting hole is a circular through hole, and the length direction of the elongated through hole is consistent with the axial direction of the column end connector and the crossbeam.

[0010] In one embodiment of the present invention, the first connecting plate has arc-shaped notches on both sides along the axial direction of the column end connector and the crossbeam, and the arc-shaped notches are directly opposite the fitting points of the first bend and the second bend.

[0011] In one embodiment of the present invention, the height and width of the column end connector and the crossbeam are equal.

[0012] In one embodiment of the present invention, the second connecting plate is detachably connected to the column end connector and the crossbeam by a second bolt.

[0013] In one embodiment of the present invention, the surface of the second connecting plate is provided with a plurality of third connecting holes, and the surface of the column end connector and the crossbeam is provided with a fourth connecting hole that mates with the third connecting holes.

[0014] In one embodiment of the present invention, an avoidance opening is provided at the edge of the end where the web of the column end connector and the web of the crossbeam are attached.

[0015] Compared with the prior art, the above-described technical solution of the present invention has the following advantages:

[0016] This invention discloses a functionally recoverable flange-wave-shaped I-beam joint connection device. This device creates waves above and below the original flange welding position, effectively improving the joint's energy dissipation capacity and seismic performance. Several different connection devices are designed to control the joint failure location to a pre-set connection point. Even after the connection fails, the main body of the joint remains intact and retains a certain load-bearing capacity. Attached Figure Description

[0017] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is an exploded view of the overall structure of the present invention;

[0020] Figure 3 for Figure 1 Schematic diagram of the structure of the central column end connector;

[0021] Figure 4 This is a schematic diagram of the structure of the first connecting plate in Embodiment 1;

[0022] Figure 5 This is a schematic diagram of the structure of the first connecting plate in Embodiment 2;

[0023] Figure 6 This is a schematic diagram of the structure of the first connecting plate in Embodiment 3;

[0024] Figure 7 This is a schematic diagram of the structure of the first connecting plate in Embodiment 4;

[0025] Figure 8 This is a schematic diagram of the structure of the first connecting plate in Embodiment 5;

[0026] Figure 9 This is a load-deformation hysteresis curve diagram in this invention;

[0027] Explanation of reference numerals in the accompanying drawings: 1. Main beam; 2. Crossbeam; 3. Column end connector; 4. First connecting plate; 5. Second connecting plate; 6. First bolt; 7. Second bolt; 21. Second connecting hole; 22. Second bend; 23. Fourth connecting hole; 24. Clearance opening; 31. First bend; 41. First connecting hole; 42. Arc-shaped notch; 51. Third connecting hole. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0029] Reference Figures 1-3As shown, this invention discloses a functionally recoverable flange-wave-shaped I-beam node connection device, comprising: a main beam 1, a crossbeam 2, a column end connector 3, and a pair of first connecting plates 4. The cross sections of the main beam 1, the crossbeam 2, and the column end connector 3 are all I-beam structures. One end of the column end connector 3 is connected to the main beam 1. The two flanges of the end of the column end connector 3 away from the main beam 1 are bent relative to each other to form a first bend 31. The two flanges of one end of the crossbeam 2 are bent relative to each other to form a second bend 22. The outer edge of the second bend 22 is in contact with the outer edge of the first bend 31. The first connecting plates 4 are disposed between the column end connector 3 and the crossbeam 2, and the first connecting plates 4 are in contact with the flange sides of the column end connector 3 and the crossbeam 2. A second connecting plate 5 is also disposed between the column end connector 3 and the crossbeam 2, and the second connecting plate 5 is in contact with one side of the web of the column end connector 3 and the web of the crossbeam 2.

[0030] The present invention provides a column end connector 3 between the main beam 1 and the cross beam 2. The column end connector 3 is connected to the cross beam 2 with an arc-shaped bend and is connected by a first connecting plate 4 and a second connecting plate 5. When the first connecting plate 4 is damaged, the main body of the node is still intact and has a certain load-bearing capacity. Moreover, the upper and lower flange bends will be stretched under the action of earthquake, so that the whole structure has a strong energy dissipation capacity and ductility, and improves the seismic effect.

[0031] In seismic design, plastic hinge failure often occurs in structures. The seismic design principle is strong column and weak beam. Ideally, the plastic hinge should be located on the beam 2. For the structure, in order to ensure that the plastic hinge is located on the beam 2 and to prevent the plastic hinge from being located at the mid-span of the beam 2 and causing excessive damage to the beam, it is ideal to control the location of the plastic hinge near the end of the beam 2. This invention controls the failure location on the connecting device of the beam 2, which can effectively make the plastic hinge at the node occur at the end of the beam 2.

[0032] Specifically, in this invention, the column end connector 3 is disposed between the crossbeam 2 and the main beam 1, and the length of the column end connector 3 is much smaller than the size of the crossbeam 2. One end of the column end connector 3 is welded to the main beam 1, and the other end of the column end connector 3 is connected by a first connecting plate 4 and a second connecting plate 5. The first connecting plate 4 is disposed on the flange surface of the column end connector 3 and the crossbeam 2, and the second connecting plate 5 is disposed on the web surface of the column end connector 3 and the crossbeam 2. In this invention, the end of the column end connector 3 connected to the crossbeam 2 is provided with a first bend 31, and similarly, the end of the crossbeam 2 connected to the column end connector 3 is provided with a second bend 22. Both the first bend 31 and the second bend 22 are bent into a corrugated shape towards one side of the web, and the first bend 31 and the second bend 22 are arranged perpendicular to the length axis of the crossbeam 2. In the actual assembly process, the first bend 31 and the second bend 22 are fitted together to form a complete corrugation between the column end connector 3 and the crossbeam 2, and then connected by the first connecting plate 4 and the second connecting plate 5. The node failure location is controlled at the pre-set first connecting plate 4. After the first connecting plate 4 fails, the node body remains intact and has a certain load-bearing capacity. Secondly, after the first connecting plate 4 fails, the upper and lower flange wave-generating structures of the column end connector 3 and the beam 2 will be stretched under the seismic action, giving the entire structure a strong energy dissipation capacity and ductility.

[0033] The node connection device of the present invention generates waves above and below the original flange welding position, which can effectively improve the energy dissipation capacity and seismic performance of the node. The failure location of the node can be controlled at a pre-set position. When the first connecting plate 4 is damaged, the main body of the node remains intact and has a certain load-bearing capacity.

[0034] Furthermore, the first connecting plate 4 is detachably connected to the column end connector 3 and the crossbeam 2 by the first bolt 6.

[0035] Specifically, the first connecting plate 4 is connected to the column end connector 3 and the crossbeam 2 by the first bolt 6. During an earthquake, the bolt connection provides better seismic resistance; and during post-earthquake repair, the first connecting plate 4 can be easily replaced. As a preferred embodiment of the present invention, the first connecting plate 4 can also be fixed to the column end connector 3 and the crossbeam 2 by welding. Compared with the bolt connection, the welding method can improve the connection strength between the crossbeam 2 and the column end connector 3.

[0036] Furthermore, the surface of the first connecting plate 4 is provided with a plurality of first connecting holes 41, and the surfaces of the column end connector 3 and the flange of the crossbeam 2 are provided with second connecting holes 21 that cooperate with the first connecting holes 41.

[0037] Specifically, in the actual assembly process, the first connecting plate 4 is fitted with the flanges of the column end connector 3 and the crossbeam 2, so that the first connecting hole 41 and the second connecting hole 21 are aligned. Then, the first bolt 6 is passed through the first connecting hole 41 and the second connecting hole 21 to connect the column end connector 3 and the crossbeam 2.

[0038] Reference Figure 3 and Figure 8 As shown, in a preferred embodiment of the present invention, both the first connecting hole 41 and the second connecting hole 21 are circular through holes. The first bolt 6 is mainly subjected to shear, and the first connecting hole 41 and the second connecting hole 21 provide "rigid constraints" on the first bolt 6, resulting in direct and concentrated force transmission and high connection stiffness.

[0039] Furthermore, as another embodiment of the present invention, refer to Figure 4 and Figure 5 As shown, in a preferred embodiment of the present invention, the first connecting hole 41 is an elongated through hole, the second connecting hole 21 is a circular through hole, and the length direction of the elongated through hole is consistent with the axial direction of the column end connector 3 and the crossbeam 2.

[0040] Specifically, the first connecting hole 41 can also be an elongated hole. During an earthquake, the left and right swaying of the entire building allows the first bolt 6 to be adjusted left and right within the elongated hole, reducing the shear stress on the first bolt 6 and further improving the seismic resistance of the entire structure.

[0041] Furthermore, referring to Figure 5 and Figure 7 As shown, the first connecting plate 4 has arc-shaped notches 42 on both sides along the axial direction of the column end connector 3 and the crossbeam 2. The arc-shaped notches 42 are directly opposite the joint of the first bend 31 and the second bend 22.

[0042] Specifically, the arc-shaped notch 42 is located on both sides of the first connecting plate 4, meaning the width in the middle of the first connecting plate 4 is smaller than the width at both ends, giving the entire first connecting plate 4 a dog-bone shape. This structure makes the first connecting plate 4 easier to break at the arc-shaped notch 42, allowing for precise control of the breakage location. In actual assembly, to ensure connection strength, the thickness of the dog-bone shaped first connecting plate 4 is greater than the thickness of the rectangular first connecting plate 4.

[0043] Furthermore, the height and width of the column end connector 3 and the crossbeam 2 are equal, meaning the dimensions of the I-beams on both sides are equal, which ensures the connection strength between the crossbeam 2 and the column end connector 3. Secondly, during assembly, the first bend 31 and the second bend 22 can fit together completely, allowing the entire bend to be stretched during an earthquake, thus ensuring seismic performance.

[0044] Furthermore, the second connecting plate 5 is detachably connected to the column end connector 3 and the crossbeam 2 via a second bolt 7. The surface of the second connecting plate 5 has multiple third connecting holes 51, and the surfaces of the column end connector 3 and the crossbeam 2 have fourth connecting holes 23 that mate with the third connecting holes 51.

[0045] Specifically, the second connecting plate 5 further secures the column end connector 3 and the beam 2. After an earthquake, if the first connecting plate 4 is damaged, the second connecting plate 5 can still ensure the load-bearing capacity of the entire structure. Similarly, the second connecting plate 5 is detachably connected to the column end connector 3 and the beam 2 by the second bolt 7, facilitating the assembly and disassembly of the entire structure and subsequent maintenance. Compared with welding, bolted connections can also improve the seismic performance of the entire structure.

[0046] Furthermore, an avoidance opening 24 is provided at the edge where the web of the column end connector 3 and the web of the crossbeam 2 are attached, so as to avoid the first bend 31 and the second bend 22.

[0047] In this invention, the main beam 1, column end connector 3, crossbeam 2, first connecting plate 4, and second connecting plate 5 are all made of Q345 steel, and the first bolt 6 and second bolt 7 are both 10.9 grade high-strength bolts. The testing methods involved in the following embodiments are as follows:

[0048] Method for testing the ultimate bearing capacity of joints: An ultimate bearing capacity test was conducted on beam-column joint elements using a quasi-static loading experiment. The column top and column base of main beam 1 were both connected by planar hinges to simulate the inflection point boundary conditions. The specimen was preloaded twice using a vertical jack installed at the column top, and then vertical axial force was applied in two stages to the predetermined load, 0.5 kN and 1.0 kN respectively. After each load stage, the load was maintained for 1 minute, and data was collected. After the predetermined vertical axial force was applied, the beam end support (one end of beam 2) was installed to ensure that no additional internal forces were introduced into the beam end during the application of the axial force; the beam end also used a hinged connection. Finally, a low-cycle reciprocating load was applied to the beam end until the specimen failed, and the axial force at the column top remained constant throughout the loading process. The loading is controlled by displacement. The displacement angles are 1 / 1000, 1 / 800, 1 / 500, 1 / 400, and 1 / 300, with each level cycling once. When the displacement angles are 1 / 200, 1 / 150, 1 / 100, 1 / 75, 1 / 50, 1 / 35, 1 / 30, 1 / 25, and 1 / 20, each level cycles three times.

[0049] Method for detecting the limit displacement of nodes: One displacement gauge is placed at the top of the column and one at the end of the beam of the specimen to measure the displacement during the loading process; two strain gauges are placed on each side of the crossbeam 2 and the main beam 1 along the longitudinal and transverse directions, and three strain rosettes are placed on the surface of the nodes along the diagonal direction.

[0050] Calculation method for node energy dissipation capacity: The energy dissipation capacity of the specimen, refer to... Figure 9 As shown, the energy dissipation factor should be measured by the area enclosed by the load-deformation hysteresis curve, and should be calculated using the following formula:

[0051]

[0052] Example 1 is a connection device for a rectangular steel column with an oblong hole and an I-beam. One end of the column end connector 3 is welded to the main beam 1, and the flange of the other end of the column end connector 3 is connected to the flange of the crossbeam 2 through a first connecting plate 4. (Refer to...) Figure 4 As shown, the first connecting plate 4 is a rectangular plate, and the first connecting hole 41 is an oblong hole; the web of the column end connector 3 and the web of the crossbeam 2 are connected by the second connecting plate 5.

[0053] Example 2 is a connection device for a steel column with a dog-bone shaped oblong hole steel plate and an I-beam, referring to... Figure 5 As shown, compared with Embodiment 1, the first connecting hole 41 in this embodiment is also an oblong hole. The difference is that the shape of the first connecting plate 4 is dog bone shaped, making the first connecting plate 4 easier to be damaged, and the node damage position is precisely controlled on the first connecting plate 4.

[0054] Example 3 is a connection device between a welded steel column and an I-beam, referring to... Figure 6 As shown, compared to Embodiment 1, the surface of the first connecting plate 4 in this embodiment does not have the first connecting hole 41, and the first connecting plate 4 is welded and fixed to the column end connector 3 and the crossbeam 2; similarly, the second connecting plate 5 is connected to the column end connector 3 and the crossbeam 2 by the second bolt 7.

[0055] Example 4 is a connection device for welded steel columns made of dog-bone steel plates and I-beams, referring to... Figure 6 and Figure 7 As shown, compared to Embodiment 3, the first connecting plate 4 in this embodiment is dog-bone shaped. Similarly, the first connecting plate 4 is fixed to the column end connector 3 and the crossbeam 2 by welding, and the second connecting plate 5 is connected to the column end connector 3 and the crossbeam 2 by the second bolt 7.

[0056] Example 5 is a connection device between a perforated steel plate and an I-beam, referring to... Figure 8 As shown, compared with Embodiment 1, the first connecting plate 4 in this embodiment is also a rectangular steel plate. The difference is that the first connecting hole 41 is a circular through hole. The first connecting plate 4 is connected to the column end connector 3 and the crossbeam 2 by the first bolt 6.

[0057] For Embodiment 1, the construction method is as follows: the cross-sectional dimensions of the main beam 1 are 400mm×400mm×15mm×21mm, the cross-sectional dimensions of the cross beam 2 and the column end connector 3 are 300mm×150mm×10mm×10mm, the thickness of the first connecting plate 4 and the second connecting plate 5 is 5mm, the diameter of the second connecting hole 21, the third connecting hole 51 and the fourth connecting hole 23 is 20mm, the width of the first connecting hole 41 (oblong hole) is 20mm, and the diameter of the first bolt 6 and the second bolt 7 is 16mm.

[0058] Based on the above-mentioned methods for detecting ultimate bearing capacity and ultimate displacement, the ultimate bearing capacity and ultimate displacement of the nodes were measured, and the energy dissipation capacity of the nodes was calculated. The results are as follows: the ultimate bearing capacity of the node is 90.87 kN, the ultimate displacement of the node is 109.59 mm, and the energy dissipation coefficient is 0.265.

[0059] The traditional construction method for I-beams is as follows: the upper and lower flanges of the crossbeam 2 are welded to the main beam 1, and the web of the crossbeam 2 is bolted to the main beam 1. Similarly, the cross-sectional dimensions of the main beam 1 are 400mm×400mm×15mm×21mm, the cross-sectional dimensions of the crossbeam 2 are 300mm×150mm×10mm×10mm, the thickness of the second connecting plate 5 is 5mm, the diameter of the opening on the web surface is 20mm, and the bolt diameter is 16mm.

[0060] Based on the above-mentioned methods for detecting ultimate bearing capacity and ultimate displacement, the ultimate bearing capacity and ultimate displacement of the nodes were measured, and the energy dissipation capacity of the nodes was calculated. The results are as follows: the ultimate bearing capacity of the node is 107.45 kN, the ultimate displacement of the node is 86.32 mm, and the energy dissipation coefficient is 0.234.

[0061] The comparison shows that the node connection structure of the present invention can effectively improve energy consumption capacity.

[0062] In summary, this invention introduces a functionally recoverable flange-wave-type I-beam joint connection device. This joint connection device improves upon existing I-beam connection technology by creating waves above and below the original flange welding position, effectively enhancing the joint's energy dissipation capacity and seismic performance. This invention also designs several different connection devices that can control the joint failure location to a pre-set connection point. Even after the connection point fails, the main body of the joint remains intact and retains a certain load-bearing capacity.

[0063] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A functionally recoverable flange-wave-shaped I-beam node connection device, characterized in that, include: The system comprises a main beam, a crossbeam, a column end connector, and a pair of first connecting plates. The cross-sections of the main beam, crossbeam, and column end connector are all I-beam structures. One end of the column end connector is connected to the main beam. The two flanges of the end of the column end connector away from the main beam are bent relative to each other to form a first bend. The two flanges of one end of the crossbeam are bent relative to each other to form a second bend. The outer edge of the second bend is in contact with the outer edge of the first bend. The first connecting plates are disposed between the column end connector and the crossbeam, and are in contact with the flange sides of the column end connector and the crossbeam. A second connecting plate is also disposed between the column end connector and the crossbeam, and is in contact with one side of the web of the column end connector and the web of the crossbeam.

2. The functionally recoverable flange-wave-shaped I-beam node connection device according to claim 1, characterized in that: The first connecting plate is detachably connected to the column end connector and the crossbeam by a first bolt.

3. The functionally recoverable flange-wave-shaped I-beam node connection device according to claim 1, characterized in that: The surface of the first connecting plate is provided with a plurality of first connecting holes, and the surfaces of the column end connector and the flange of the crossbeam are provided with second connecting holes that mate with the first connecting holes.

4. The functionally recoverable flange-wave-shaped I-beam node connection device according to claim 3, characterized in that: Both the first connecting hole and the second connecting hole are circular through holes.

5. The functionally recoverable flange-wave-shaped I-beam node connection device according to claim 3, characterized in that: The first connecting hole is an oblong through hole, and the second connecting hole is a circular through hole, with the length direction of the oblong through hole aligned with the axial direction of the column end connector and the crossbeam.

6. The functionally recoverable flange-wave-shaped I-beam node connection device according to claim 1, characterized in that: The first connecting plate has arc-shaped notches on both sides along the axial direction of the column end connector and the crossbeam, and the arc-shaped notches are directly opposite the joint of the first bend and the second bend.

7. The functionally recoverable flange-wave-shaped I-beam node connection device according to claim 1, characterized in that: The height and width of the column end connector and the crossbeam are equal.

8. The functionally recoverable flange-wave-shaped I-beam node connection device according to claim 1, characterized in that: The second connecting plate is detachably connected to the column end connector and the crossbeam by a second bolt.

9. The functionally recoverable flange-wave-shaped I-beam node connection device according to claim 8, characterized in that: The surface of the second connecting plate is provided with a plurality of third connecting holes, and the surface of the column end connector and the crossbeam is provided with a fourth connecting hole that mates with the third connecting holes.

10. The functionally recoverable flange-wave-shaped I-beam joint connection device according to claim 1, characterized in that: The edge of the column end connector where the web plate and the web plate of the crossbeam meet is provided with a clearance opening.

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