A self-resetting beam-column energy-dissipating joint based on spatial friction surface without prestressed tendons

Abstract

This invention discloses a self-resetting beam-column energy-dissipating node based on a spatial friction surface that eliminates the need for prestressing tendons. It includes an I-beam, an I-beam column, and a self-resetting torsional damper. The self-resetting torsional damper comprises a friction mechanism with a spatial friction surface, a limiting steel plate, a round steel pipe pin, a disc spring, and a high-strength bolt. The limiting steel plate is positioned above and below the friction mechanism. The round steel pipe pin passes through the friction mechanism and connects the upper and lower limiting steel plates. The disc spring is positioned between the limiting steel plate and the friction mechanism. The high-strength bolt passes through the limiting steel plate, the disc spring, and the friction mechanism to achieve an overall hinged connection. The friction mechanism includes a double-sided corrugated spatial friction plate, a first single-sided corrugated spatial friction plate, and a second single-sided corrugated spatial friction plate, all three interlocking. The double-sided corrugated spatial friction plate is connected to the I-beam, and the limiting steel plate is connected to the I-beam column. This invention eliminates the need for on-site prestressing tendons, resulting in high construction efficiency and excellent energy dissipation and self-resetting capabilities.

Description

Technical Field

[0001] This invention belongs to the field of novel prefabricated steel structure technology, specifically relating to a self-resetting beam-column energy dissipation node based on a spatial friction surface that does not require tensioning of prestressed tendons. Background Technology

[0002] Earthquake disasters are a significant constraint on stable economic development. Recent earthquakes and subsequent rescue efforts have demonstrated that many houses become unusable due to residual displacement, and the economic losses and time costs of rebuilding negatively impact normal production and daily life in affected areas for an extended period. Currently, precast steel structures using prestressed tendons employ special node construction methods to achieve contact-lift behavior at the nodes, resulting in a unique flag-shaped hysteresis curve. Because this type of self-setting steel frame requires significant prestressing during assembly, it demands high-level construction techniques.

[0003] To improve assembly efficiency, self-resetting supports that deform axially are prestressed and assembled in the factory, requiring only on-site installation of the finished product. Numerous engineering applications have already demonstrated this. The self-resetting mechanism using "double sleeves" with prestressing tendons is common in supports, but its internal structure is complex, and construction errors such as component length differences are difficult to avoid, leading to a decrease in the initial stiffness of the self-resetting support. This change in key design parameters may introduce certain safety hazards. To address the insufficient axial deformation capacity of the support, disc springs are used instead of prestressing tendons. This new type of self-resetting support offers better axial deformation capacity and cost-effectiveness. Shape memory alloys (SMAs) possess excellent shape memory and hyperelastic properties. Supports using this new material have simple construction but are expensive, and their performance is affected by temperature. Furthermore, support installation occupies space under beams, obstructs the indoor view of residents, causing discomfort, and necessitates the rearrangement of passageways related to spatial division to avoid the supports. Additionally, the overall steel consumption of the supports is significant. Currently, torsional dampers have gradually become a research hotspot due to their small footprint and the fact that their arrangement does not affect the division of usable space. However, related research focuses on improving the energy dissipation capacity of the dampers. In addition, due to the change in deformation mode, the installation space for torsional dampers is even narrower, and self-resetting mechanisms are not suitable for torsional dampers.

[0004] A novel friction damper employs a friction surface at a fixed angle to the horizontal direction, resulting in a simple structure. It utilizes geometric nonlinearity to achieve self-resetting, and this device shows broad application prospects in self-resetting supports with axial motion. Applying this principle to a torsional damper, under torsional deformation mode, if a friction plane with the same radial slope is still used, excessive local stress will occur during rotation. Therefore, the fixed-angle friction plane is modified to a spatial friction surface. Furthermore, due to the limitations of high-strength bolt connections or welding, beam-column joints only allow in-plane rotation within the joint area. However, the upper and lower friction surfaces generate out-of-plane displacement while torturing in the plane. To prevent out-of-plane torsional failure of the end plate during in-plane rotation, this self-resetting friction damper is difficult to directly apply in this joint area. Summary of the Invention

[0005] To address the aforementioned problems, the present invention aims to provide a self-resetting beam-column energy dissipation node based on a spatial friction surface that does not require tensioning of prestressing tendons.

[0006] The specific technical solution is as follows:

[0007] A self-resetting beam-column energy dissipation node based on a spatial friction surface and without the need for prestressed tendons includes an I-beam column, an I-beam with a reinforcing connection at the end, and a self-resetting torsional damper with a spatial friction surface. The self-resetting torsional damper includes a friction mechanism with a spatial friction surface, a limiting steel plate, a round steel pipe pin, a disc spring, and high-strength bolts. The limiting steel plate is located above and below the friction mechanism, and the upper and lower limiting steel plates are fixedly connected by the round steel pipe pin. The disc spring is located between the limiting steel plate and the friction mechanism. The high-strength bolts pass through the limiting steel plate, the disc spring, and the friction mechanism to achieve the overall hinge of the self-resetting torsional damper. The high-strength bolts are subjected to torque according to design requirements. The friction mechanism includes a double-sided corrugated space friction plate with a spatial friction surface, a first single-sided corrugated space friction plate, and a second single-sided corrugated space friction plate. The corrugated surfaces of the first and second single-sided corrugated space friction plates are respectively engaged with the corrugated surfaces of the double-sided corrugated space friction plate. The first single-sided corrugated space friction plate, the double-sided corrugated space friction plate, and the second single-sided corrugated space friction plate are arranged in sequence to ensure that the corrugated contact surfaces are in a closed and reliable contact state. The round steel pipe pin passes through the friction mechanism. The double-sided corrugated space friction plate is connected to the reinforcing connection device, and the limiting steel plate is connected to the I-beam column.

[0008] Furthermore, the double-sided corrugated space friction plate, the first single-sided corrugated space friction plate, and the second single-sided corrugated space friction plate all adopt spatial curved surfaces, including multiple friction surfaces. One side of each friction surface is a crest line, and the other side is a trough line. The height of the crest line and the trough line along the radial direction is consistent, ensuring that the double-sided corrugated space friction plate, the first single-sided corrugated space friction plate, and the second single-sided corrugated space friction plate can still maintain reliable contact during the misalignment process.

[0009] Considering the wear resistance of the double-sided corrugated space friction plate, the first single-sided corrugated space friction plate, and the second single-sided corrugated space friction plate, it is recommended to use No. 45 steel or add brass friction plates. The friction coefficient of the above two materials is about 0.2-0.25. It is recommended that the slope of the space surface at the center of the high-strength bolt be 15°.

[0010] Furthermore, the first single-sided corrugated space friction plate and the second single-sided corrugated space friction plate both have first circular through holes on the trough and crest lines of the corrugated surface, and the double-sided corrugated space friction plate both have elliptical through holes on the trough and crest lines.

[0011] Furthermore, the first and second single-sided corrugated space friction plates have a first circular through hole on their planar sides, and an annular groove for placing disc springs is also provided. The diameter of the annular groove is similar to the outer diameter of the disc springs. Multiple disc springs are placed in the annular groove, and pressure is applied to the disc springs by a high-strength bolt passing through its center. This generates reliable normal pressure between the contact surfaces of the double-sided corrugated space friction plates, the first single-sided corrugated space friction plates, and the second single-sided corrugated space friction plates. The starting bending moment of this damper is related to the normal pressure, the material of the friction plates, and the processing method. Under horizontal seismic action, after the beam-column joint reaches the starting bending moment, the intermediate double-sided corrugated space friction plate... The plate slides relative to the first and second single-sided corrugated spatial friction plates, consuming the energy input from the earthquake through friction. Simultaneously, as the first and second single-sided corrugated spatial friction plates move uphill, gaps form between them and the double-sided corrugated spatial friction plates, resulting in out-of-plane deformation. Therefore, multiple disc springs are designed to meet the out-of-plane deformation requirements. These disc springs continue to be compressed as gaps form, continuously increasing the pressure between the double-sided corrugated spatial friction plate and the first and second single-sided corrugated spatial friction plates. Thus, the load-bearing capacity of the torque-type damper continues to increase after activation, which is beneficial for consuming earthquake energy and further improving energy dissipation capacity. After the earthquake, the pressure within the combination of multiple disc springs forces the first and second single-sided corrugated spatial friction plates, which have slid upwards, back to or near their initial positions. Compared to the peak displacement, the residual displacement of the damper after the earthquake is negligible.

[0012] Furthermore, the limiting steel plate is evenly provided with second circular through holes, and the inner surface of the limiting steel plate is also provided with an annular groove for placing disc springs at the locations of the second circular through holes. Multiple high-strength bolts pass through the corresponding second circular through holes, disc springs, first circular through holes, and elliptical through holes to connect the limiting steel plate and the friction mechanism. The high-strength bolts fix the friction mechanism to ensure that the torque damper can rotate under horizontal seismic action.

[0013] Furthermore, the two ends of the round steel pipe pin are welded to the limiting steel plate.

[0014] To eliminate the out-of-plane deformation that increases with in-plane torsional deformation during the upward movement of the first and second single-sided corrugated space friction plates in the torsional damper, a "shear pin" is formed between the limiting steel plate and the first and second single-sided corrugated space friction plates. This pin can only transmit in-plane bending moments but allows axial compression. The limiting steel plate, the first single-sided corrugated space friction plate, and the second single-sided corrugated space friction plate have circular holes with dimensions similar to those of high-strength bolts, and each is equipped with annular grooves. Under the action of in-plane bending moments, the shear effect of the high-strength bolts and the fixing effect of the upper and lower annular grooves on the disc springs ensure that the rotation angles between the limiting steel plate and the first and second single-sided corrugated space friction plates are the same, thus ensuring reliable transmission of in-plane bending moments. Meanwhile, since the axial stiffness of the high-strength bolts is much greater than that of the disc spring assembly, the continued compression displacement of the disc spring assembly is approximately equal to the out-of-plane deformation of the first and second single-sided corrugated space friction plates, ensuring that the out-of-plane displacement of the limiting steel plate under the "clamping" effect of the high-strength bolts can be ignored.

[0015] Furthermore, one end of the double-sided corrugated space friction plate is connected to the reinforcing connection device via a connecting plate, and one end of the limiting steel plate is connected to the I-beam column via a connecting plate.

[0016] Because the high-strength bolts and multiple disc springs are connected in series, the length of the disc springs shortens under pressure as torque is applied. Therefore, torque should be applied in two stages during installation: an initial torque of 50-60% of the design value, followed by a second tightening to reach the design value. This method minimizes initial installation errors outside the plane caused by uneven preload of the high-strength bolts, avoiding adverse effects on the in-plane torsional performance of the node. Next, the flatness of the limiting steel plate is checked, and the preload of the bolts around the rotation center is ensured to be uniform. After completing these checks, the limiting steel plate is welded to both ends of the round steel pipe pin. Finally, the limiting steel plate and the double-sided corrugated space friction plate are welded to the end connecting plates. After final assembly in the factory, the assembly is transported to the site, where bolt connections are used to complete the installation of this new type of node.

[0017] The beneficial effects of this invention are as follows:

[0018] The beam-column joint of this invention utilizes frictional energy dissipation. Its key component, the self-resetting torsional damper, remains in an elastic state while effectively dissipating energy input during horizontal earthquakes. This avoids the failure of beam-column joints in traditional bending steel frames due to material nonlinearity, which could lead to joint failure or even overall structural collapse. The beam-column joint effectively eliminates or reduces residual deformation in steel frame structures caused by earthquakes. Furthermore, the self-resetting frame using this new joint eliminates the need for on-site prestressing, allowing for factory assembly and rapid on-site installation. Post-earthquake disassembly and replacement of the beam-column joint are also convenient. The initial starting force of this new beam-column joint can be controlled by the design preload of high-strength bolts, the friction coefficient of the friction surface material, and the slope angle. Due to its simple structure and clear deformation mechanism, it is easy for designers to apply. Compared to traditional frames with self-resetting supports, the self-resetting frame using the new beam-column joint does not significantly increase steel consumption and does not obstruct the building's interior space, effectively improving the living experience. Attached Figure Description

[0019] Figure 1 It is a schematic diagram of the top view of the structure of the present invention;

[0020] Figure 2 A three-dimensional structural diagram of a self-resetting torsional damper;

[0021] Figure 3 This is a cross-sectional view of a self-resetting torsional damper.

[0022] Figure 4 A schematic diagram of the connection method between the limiting steel plate and the round steel pipe pin.

[0023] Figure 5 This is a schematic diagram of the inner three-dimensional structure of the first single-sided corrugated space friction plate;

[0024] Figure 6 A schematic diagram of the outer three-dimensional structure of the first single-sided corrugated space friction plate;

[0025] Figure 7 A schematic diagram of the three-dimensional structure of a double-sided corrugated space friction plate;

[0026] Figure 8 This is a schematic diagram of the structure of a self-resetting torsional damper after rotation.

[0027] Figure 9 This is a top view of a self-resetting torsional damper after it has rotated.

[0028] In the diagram: 1. I-beam column; 2. I-beam beam; 3. Self-resetting torsional damper; 31. Friction mechanism; 311. Double-sided corrugated space friction plate; 312. First single-sided corrugated space friction plate; 313. Second single-sided corrugated space friction plate; 314. First circular through hole; 315. Elliptical through hole; 316. Annular groove; 32. Limiting steel plate; 321. Second circular through hole; 33. Round steel pipe pin; 34. Disc spring; 35. High-strength bolt; 36. Connecting plate. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings, but the scope of protection of the present invention is not limited thereto.

[0030] like Figures 1 to 3 As shown, a self-resetting beam-column energy dissipation node based on a spatial friction surface and without the need for prestressed tendons includes an I-beam column 1, an I-beam 2, a self-resetting torsional damper 3, and a connecting plate 36. The self-resetting torsional damper 3 includes a friction mechanism 31 with a spatial friction surface, two limiting steel plates 32, a round steel pipe pin 33, multiple disc springs 34, and multiple high-strength bolts 35. The friction mechanism 31 includes a double-sided corrugated spatial friction plate 311 with a spatial friction surface, a first single-sided corrugated spatial friction plate 312, and a second single-sided corrugated spatial friction plate 313, as shown. Figure 5 , Figure 6 and Figure 7 As shown, the double-sided corrugated space friction plate 311, the first single-sided corrugated space friction plate 312, and the second single-sided corrugated space friction plate 313 all adopt spatial curved surfaces. Each corrugated surface includes multiple continuous friction surfaces. One side of each friction surface is a crest line, and the other side is a trough line. The crest line and trough line maintain the same radial height. The first single-sided corrugated space friction plate 312 and the second single-sided corrugated space friction plate 313 each have a first circular through hole 314 on both the trough line and the crest line. The double-sided corrugated space friction plate 311 has a first circular through hole 314 on both the trough line and the crest line. Elliptical through holes 315 are provided on the peak lines. Annular slots 316 for placing disc springs 34 are also provided at the first circular through hole 314 on the planar side of the first single-sided corrugated space friction plate 312 and the second single-sided corrugated space friction plate 313. The corrugated surfaces of the first single-sided corrugated space friction plate 312 and the second single-sided corrugated space friction plate 313 are respectively engaged with the corrugated surfaces of the double-sided corrugated space friction plate 311. The first single-sided corrugated space friction plate 312 and the second single-sided corrugated space friction plate 313 have the same disc structure, such as... Figure 4As shown, the limiting steel plate 32 has evenly spaced second circular through holes 321. The inner surface of the limiting steel plate 32 also has an annular groove 316 for placing disc springs 34 at the location of the second circular through holes 321. Two limiting steel plates 32 are respectively positioned above and below the friction mechanism 31, so that the friction mechanism 31 is located between the limiting steel plates 32. The upper and lower limiting steel plates 32 are welded to the upper and lower ends of the round steel pipe pin 33, and the round steel pipe pin 33 passes through the friction mechanism 31. Multiple disc springs... Spring 34 is located in the annular groove 316 between the upper and lower limiting steel plate 32 and the friction mechanism 31. Multiple high-strength bolts 35 pass through the corresponding second circular through hole 321, disc spring 34, first circular through hole 314 and elliptical through hole 315 to realize the overall hinge of the self-resetting torsional damper 3. One end of the double-sided corrugated space friction plate 311 is connected to the reinforcing connection device of the I-beam 2 through the connecting plate 36. One end of the limiting steel plate 32 is connected to the I-beam column 1 through the connecting plate 36.

[0031] During installation, first align the corrugated peaks / valleys to ensure the corrugated contact surfaces are in a closed and reliable contact state. Simultaneously, the round steel pipe pin 33 sequentially passes through the center positions of the first single-sided corrugated space friction plate 312, the double-sided corrugated space friction plate 311, and the second single-sided corrugated space friction plate 313. Disc springs 34 are placed in the annular groove 316 between the limiting steel plate 32 and the first and second single-sided corrugated space friction plates 312 and 313, as designed. The limiting steel plates 32 on both sides and the round steel pipe pin... 33. Welding: High-strength bolts 35 connect the limiting steel plate 32, disc spring 34, and friction mechanism 31, and apply torque to the high-strength bolts 35 according to design requirements; then check the flatness of the limiting steel plate 32, and ensure that the preload of the high-strength bolts 35 around the rotation center is the same. Finally, connect the limiting steel plate 32 and the double-sided corrugated space friction plate 311 to the connecting plate 36 respectively. After factory assembly, transport to the site. The connecting plate 36 can be connected to the I-beam column 1 and I-beam beam 2 by bolt connection to complete the node installation.

[0032] like Figure 8 and Figure 9As shown, when the node moves in the plane, the disc spring 34 and the high-strength bolt 35 in the annular groove 316 act as "shear pins" during the rotation process. They only allow the out-of-plane distance between the limiting steel plate 32 and the corrugated plate to change, but ensure that the rotation angle is the same. Therefore, during the torsion process, the disc spring 34 always maintains axial deformation. When in-plane torsional deformation occurs, the first single-sided corrugated space friction plate 312 and the second single-sided corrugated space friction plate 313 move upward along the curved surface, resulting in out-of-plane deformation. A "shear pin" is formed between the limiting steel plate 32 and the first and second single-sided corrugated space friction plates 312 and 313, which can only transmit in-plane bending moments but allow axial compression. Under the action of in-plane bending moments, the shear effect of the high-strength bolt 35 and the fixing effect of the annular groove 316 on the disc spring 34 ensure that the rotation angle between the limiting steel plate 32 and the first and second single-sided corrugated space friction plates 312 and 313 is the same, that is, the reliable transmission of in-plane bending moments. At the same time, since the axial stiffness of the high-strength bolt 35 is much greater than that of the disc spring 34, and the disc spring 34 is connected in series with the high-strength bolt 35, the out-of-plane deformation of the limiting steel plate 32 is approximately equal to the continued compression of the disc spring 34, ensuring that the out-of-plane displacement of the limiting steel plate 32 is negligible. Under horizontal seismic loading, after the beam-column joint reaches the initiating bending moment, the first single-sided corrugated spatial friction plate 312, the double-sided corrugated spatial friction plate 311, and the second single-sided corrugated spatial friction plate 313 slide relative to each other. Friction between the contact surfaces dissipates the energy input from the earthquake. Simultaneously, as the first and second single-sided corrugated spatial friction plates 312 and 313 move uphill, gaps form between them and the double-sided corrugated spatial friction plate 311. As the disc spring 34 continues to be compressed due to these gaps, its internal force continuously increases. At this time, the pressure between the contact surfaces of the first single-sided corrugated spatial friction plate 312, the double-sided corrugated spatial friction plate 311, and the second single-sided corrugated spatial friction plate 313 also continuously increases. Therefore, the load-bearing capacity of the torsional damper continues to increase after initiation. After the earthquake, due to its internal pressure, the disc spring 34 ensures that the first and second single-sided corrugated spatial friction plates 312 and 313, which have slid upwards or downwards, return to or approach their initial positions.

Claims

1. A self-resetting beam-column energy dissipation joint based on a spatial friction surface and without the need for tensioned prestressing tendons, characterized in that, The device includes an I-beam column (1), an I-beam beam (2) with a reinforcing connection device at the end, and a self-resetting torsional damper (3) with a spatial friction surface. The self-resetting torsional damper (3) includes a friction mechanism (31) with a spatial friction surface, a limiting steel plate (32), a round steel pipe pin (33), a disc spring (34), and a high-strength bolt (35). The limiting steel plate (32) is located above and below the friction mechanism (31). The upper and lower limiting steel plates (32) are fixedly connected by the round steel pipe pin (33), and the round steel pipe pin (33) passes through the friction mechanism (31). The disc spring (34) is located between the limiting steel plate (32) and the friction mechanism (31). The high-strength bolt (35) passes through the limiting steel plate (32), the disc spring (34), and the friction mechanism (31) to achieve the overall hinge of the self-resetting torsional damper (3). The friction mechanism (31) includes a double-sided corrugated space friction plate (311) with a spatial friction surface, a first single-sided corrugated space friction plate (312) and a second single-sided corrugated space friction plate (313). The corrugated surfaces of the first single-sided corrugated space friction plate (312) and the second single-sided corrugated space friction plate (313) are respectively engaged and connected with the corrugated surface of the double-sided corrugated space friction plate (311). The double-sided corrugated space friction plate (311) is connected to a reinforcing connection device, and the limiting steel plate (32) is connected to the I-beam column (1).

2. The self-resetting beam-column energy dissipation joint based on a spatial friction surface and without the need for tensioned prestressing tendons as described in claim 1, characterized in that, The double-sided corrugated space friction plate (311), the first single-sided corrugated space friction plate (312), and the second single-sided corrugated space friction plate (313) all adopt a space curved surface, including multiple friction surfaces. One side of each friction surface is a crest line and the other side is a trough line. The crest line and the trough line have the same radial height.

3. The self-resetting beam-column energy dissipation joint based on a spatial friction surface and without the need for tensioned prestressing tendons as described in claim 2, characterized in that, The first single-sided corrugated space friction plate (312) and the second single-sided corrugated space friction plate (313) both have a first circular through hole (314) on the trough line and the crest line of the corrugated surface, and the double-sided corrugated space friction plate (311) both have an elliptical through hole (315) on the trough line and the crest line of the corrugated surface.

4. The self-resetting beam-column energy dissipation joint based on a spatial friction surface and without the need for tensioned prestressing tendons as described in claim 3, characterized in that, The first single-sided corrugated space friction plate (312) and the second single-sided corrugated space friction plate (313) have a first circular through hole (314) on their flat side, and an annular slot (316) for placing a disc spring (34) is also provided.

5. The self-resetting beam-column energy dissipation joint based on a spatial friction surface and without the need for tensioned prestressing tendons as described in claim 4, characterized in that, The limiting steel plate (32) is evenly provided with a second circular through hole (321). The inner surface of the limiting steel plate (32) is provided with an annular groove (316) for placing a disc spring (34) at the location of the second circular through hole (321). Multiple high-strength bolts (35) are connected by passing through the corresponding second circular through hole (321), disc spring (34), first circular through hole (314) and elliptical through hole (315).

6. The self-resetting beam-column energy dissipation joint based on a spatial friction surface and without the need for tensioned prestressing tendons as described in claim 1, characterized in that, The two ends of the round steel pipe pin (33) are welded to the limiting steel plate (32).

7. The self-resetting beam-column energy dissipation joint based on a spatial friction surface and without the need for tensioned prestressing tendons as described in claim 1, characterized in that, One end of the double-sided corrugated space friction plate (311) is connected to the reinforcing connection device through the connecting plate (36), and one end of the limiting steel plate (32) is connected to the I-beam column (1) through the connecting plate (36).

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