Energy dissipation and vibration reduction self-resetting cable device for large-span prestressed steel structure

Abstract

The application discloses a large-span prestressed steel structure energy dissipation and vibration reduction self-resetting cable device, which comprises a baffle arranged on the left and right sides, a cable penetrating through the baffles, a cushion block and an anchor for anchoring the cable, a steel pull rod penetrating through the left and right baffles in sequence, a cushion plate welded at the two ends of the steel pull rod, a steel strand penetrating through the center of the steel pull rod, a second anchor for anchoring the steel strand, a spiral spring nested outside the steel pull rod and welded at the inner sides of the left and right baffles at the two ends, respectively, an upper dislocation plate welded at the inner side of the left baffle, a lower dislocation plate welded at the inner side of the right baffle, an energy dissipation device penetrating through upper and lower strip-shaped bolt holes in sequence, wherein the energy dissipation device comprises a screw rod, upper and lower nuts and upper and lower friction gaskets, and further comprises a friction energy dissipation block embedded between the upper and lower dislocation plates and a stopper for preventing the friction energy dissipation block from falling off; the device can realize energy dissipation and vibration reduction through the tensile and compressive deformation of the spiral spring and the relative sliding of the upper and lower dislocation plates, and can realize the self-resetting function through the steel strand in the steel pull rod and the spiral spring.

Description

Technical Field

[0001] This invention relates to the field of civil engineering technology, and in particular to an energy-dissipating, vibration-damping, self-resetting cable device for large-span prestressed steel structures. Background Technology

[0002] With urbanization and the continuous evolution of building structures, the application of large-span steel structures in public buildings is gradually increasing. Prestressed steel structures are a typical form of large-span steel structure, characterized by their light weight, high load-bearing capacity, strong spanning ability, and aesthetically pleasing design. They are widely used in large public buildings such as high-speed rail stations, airport terminals, and convention centers, which play a vital urban role, are densely populated, and attract significant public attention; their structural performance directly impacts public safety. However, when facing dynamic loads (such as common pulsating winds and earthquakes), large-span prestressed steel structures often exhibit large dynamic responses due to insufficient energy dissipation, posing new challenges to structural stability and safety.

[0003] To achieve energy dissipation, vibration reduction, and self-correcting performance in structures, numerous researchers have proposed various energy dissipation and vibration reduction devices and technologies for different structural systems, effectively controlling structural vibration and enhancing structural energy dissipation. However, there are still relatively few energy dissipation, vibration reduction, and self-correcting devices for large-span prestressed steel structures. Furthermore, existing energy dissipation, vibration reduction, or self-correcting devices mainly target the structure, key compression members, and nodes, neglecting the issue of fatigue damage and relaxation of cables under dynamic loads, which in turn affects the stress performance of connected components or the overall structure.

[0004] Some studies have shown that long-span prestressed tensioned truss structures are highly sensitive to wind loads. This is because under wind loads, the cable tension in the tensioned truss structure decreases significantly, and cable relaxation may even occur. Cable relaxation and loss of function mean that the tensioned truss structure will "abruptly transform" into a general truss structure, resulting in a qualitative decline in its load-bearing capacity and greatly increasing the risk of structural collapse. Therefore, improving the energy dissipation, vibration reduction, and self-correcting capabilities of the cables is of great significance for the safety and durability of long-span prestressed steel structures. Summary of the Invention

[0005] To solve the above technical problems, the present invention provides an energy-dissipating and vibration-damping self-resetting cable device for a large-span prestressed steel structure, comprising two mutually symmetrical baffles for fixing the cable, the two baffles being parallel to each other and arranged vertically, and an even number of resetting devices vertically connected between the two baffles, the resetting devices being used to keep the distance between the two baffles constant, all the resetting devices being symmetrically distributed along the height and width directions of the baffles, the resetting device comprising a steel tie rod vertically penetrating through the two baffles, the two ends of the steel tie rod being respectively fixed with pads that abut against the outer surface of the corresponding side baffle, the steel tie rod having a coaxially formed strip hole inside, and a steel strand having both ends respectively fixed to the corresponding side pads passing through the strip hole, and a helical spring coaxially sleeved on the steel tie rod and in a natural state connected between the two baffles;

[0006] A horizontal upper sliding plate and a lower sliding plate are arranged vertically between the two baffles. The upper sliding plate and the lower sliding plate are fixed to different baffles. A friction energy dissipation block for self-resetting cable friction is provided between the upper sliding plate and the lower sliding plate for shear deformation. The upper and lower ends of the friction energy dissipation block abut against the upper sliding plate and the lower sliding plate, respectively. The ends of the upper sliding plate and the lower sliding plate that are not connected to the baffles are respectively provided with downward protruding blocks and upward protruding blocks.

[0007] An even number of vertical energy-consuming devices are provided between the upper sliding plate and the lower sliding plate. The energy-consuming devices are symmetrically distributed along the length and width of the upper sliding plate. The energy-consuming devices include upper strip bolt holes and lower strip bolt holes symmetrically opened on the upper sliding plate and the lower sliding plate, respectively. They also include screws that vertically penetrate the upper strip bolt holes and the lower strip bolt holes, and the screws do not abut against the inner walls of the upper strip bolt holes and the lower strip bolt holes.

[0008] The upper and lower ends of the screw are respectively threaded with an upper nut and a lower nut. The upper and lower ends of the screw are also respectively fitted with an upper friction washer and a lower friction washer. The upper and lower surfaces of the upper friction washer abut against the upper bolt and the upper sliding plate, respectively. The upper and lower surfaces of the lower friction washer abut against the lower sliding plate and the lower bolt, respectively.

[0009] The technical solution further defined in this invention is:

[0010] Furthermore, the baffle is set as a rectangular plate, and a pad is provided at the center of the side of the baffle that is close to the friction energy dissipation block. A first anchor is provided on the side of the pad that is close to the friction energy dissipation block. The cable passes through the baffle and the pad on the same side in sequence and is then anchored to the first anchor on the corresponding side.

[0011] As described above, a self-resetting cable device for energy dissipation and vibration reduction of a large-span prestressed steel structure includes a second anchor for fixing both ends of the steel strand to the corresponding side plate. The second anchor abuts against the side of the plate away from the baffle. After passing through the plate, the steel strand is anchored to the second anchor on the corresponding side.

[0012] As described above, a self-resetting cable device for energy dissipation and vibration reduction in a large-span prestressed steel structure has a circular hole on the pad plate that is coaxial with the steel tie rod and has the same diameter. The steel tie rod is inserted into the circular hole and welded to the two sides of the pad plate in the thickness direction.

[0013] As described above, in a large-span prestressed steel structure energy-dissipating and vibration-damping self-resetting cable device, the inner diameter of the strip hole is set to 1.2 times the diameter of the steel strand.

[0014] As described above, a self-resetting cable device for energy dissipation and vibration reduction in a large-span prestressed steel structure has a through hole on the baffle for the steel tie rod to pass through. The inner diameter of the through hole is 2mm larger than the diameter of the steel tie rod, so that the steel tie rod and the baffle can move relative to each other.

[0015] As described above, in a self-resetting cable device for energy dissipation and vibration reduction of a large-span prestressed steel structure, the friction energy dissipation block is made of rubber or elastic polymer.

[0016] As described above, a self-resetting cable device for energy dissipation and vibration reduction in a large-span prestressed steel structure has four reset devices and four energy dissipation devices.

[0017] As described above, in a large-span prestressed steel structure energy dissipation and vibration reduction self-resetting cable device, the cross-section of the stop block along the width direction of the baffle is set as a right-angled triangle, and the side of the stop block near the friction energy dissipation block is set in the vertical direction.

[0018] As described above, the energy-dissipating and vibration-damping self-resetting cable device for a large-span prestressed steel structure is made of any one of carbon steel, low alloy steel, high alloy steel, and stainless steel; the steel strand is made of multiple steel wires twisted together, and the steel wires are made of any one of carbon steel, low alloy steel, high alloy steel, and stainless steel.

[0019] The beneficial effects of this invention are:

[0020] (1) In this invention, the energy dissipation capacity of the cable of the large-span prestressed steel structure under dynamic load is enhanced. By introducing the energy dissipation and vibration reduction self-resetting cable device into the cable, the helical spring can realize hysteresis energy dissipation, while the friction energy dissipation block and the energy dissipation device can also realize friction energy dissipation. The two work together to greatly improve the energy dissipation capacity of the cable of the large-span prestressed steel structure, effectively absorb the energy input from the outside, reduce the dynamic response of the structure and the cable, and help improve the safety of the large-span prestressed steel structure under dynamic load and extend the service life of the structure.

[0021] (2) In this invention, the self-resetting ability of large-span prestressed steel structures can be effectively improved. The cable has a good self-resetting ability through the helical spring and steel strand. This design not only has a significant effect in the stress stage of the cable, but also is expected to prevent or reduce the cable tension relaxation phenomenon during long-term service, thereby improving the overall stability of the structure. The steel strand in the steel tie rod is always in a tensile state from the start of work, which is equivalent to providing a large preload to the steel tie rod, which can reduce the stress deformation of the steel tie rod and improve the load-bearing capacity and strength of the steel tie rod. When the external load increases, the internal forces of the steel strand and helical spring increase, and the cable device will generate a large self-resetting ability. After the external load decreases or disappears, the cable device can automatically return to the initial state. Attached Figure Description

[0022] Figure 1 This is a front view of the overall structure of an embodiment of the present invention;

[0023] Figure 2 This is a top view of the overall structure of an embodiment of the present invention;

[0024] Figure 3 This is a side view of the overall structure of an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the steel tie rod in an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the structure of the pad in an embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of the connection between the steel tie rod and the pad in an embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram of the energy-consuming device in an embodiment of the present invention;

[0029] Figure 8 This is a schematic diagram of the upper misaligned plate in an embodiment of the present invention;

[0030] Figure 9 This is a schematic diagram of the baffle structure in an embodiment of the present invention;

[0031] Figure 10 This is a schematic diagram of the structure of the first anchor in an embodiment of the present invention;

[0032] Figure 11 This is a schematic diagram of the forces acting on the overall device during normal operation according to an embodiment of the present invention;

[0033] Figure 12 This is a schematic diagram of the forces acting on the overall device under dynamic load according to an embodiment of the present invention.

[0034] Among them, 1. cable; 2. baffle; 21. through hole; 3. reset device; 31. steel tie rod; 311. strip hole; 32. pad; 321. round hole; 33. steel strand; 34. helical spring; 35. second anchor; 4. upper misalignment plate; 41. upper strip bolt hole; 5. lower misalignment plate; 51. lower strip bolt hole; 6. friction energy dissipation block; 7. stop block; 8. energy dissipation device; 81. screw; 82. upper nut; 83. lower nut; 84. upper friction pad; 85. lower friction pad; 9. pad block; 10. first anchor. Detailed Implementation

[0035] This embodiment provides an energy-dissipating, vibration-damping, and self-resetting cable device for a large-span prestressed steel structure, such as... Figures 1 to 10 As shown, it includes two baffles 2 spaced apart in the horizontal direction. Figure 1 The diagram shows that the baffles 2 are rectangular plates positioned vertically on the left and right sides. A pad 9 is located on the side of the baffles 2 closest to each other, with the pad 9 positioned at the center of the baffle 2. A first anchor 10 is located on the side of the pad 9 away from the corresponding side baffle 2. The cable 1 passes through the baffle 2 and pad 9 on the same side and is then anchored to the first anchor 10 on the corresponding side. In practical applications, the cable 1 and the first anchor 10 can also be replaced with high-strength connectors connected to the support, allowing the device in this embodiment to be used both in the middle and at the end of the cable 1 in a large-span prestressed steel structure. The support is an important component in an engineering structure, primarily used to support and fix structures such as beams, slabs, and columns, ensuring that these structures can bear the weight and external loads within the design range. The support also plays a crucial role in transferring loads to the foundation, thereby ensuring the stability and safety of the entire structure.

[0036] Four reset devices 3 are vertically connected between the two baffles 2. The reset devices 3 are used to keep the distance between the two baffles 2 unchanged, and the four reset devices 3 are symmetrically distributed at the four corners of the baffles 2. The reset device 3 includes a steel tie rod 31 that penetrates vertically through the two baffles 2. The steel tie rod 31 is made of any one of carbon steel, low alloy steel, high alloy steel and stainless steel. The baffles 2 are also provided with through holes 21 for the steel tie rod 31 to pass through. The inner diameter of the through hole 21 is 2mm larger than the diameter of the steel tie rod 31, so that the steel tie rod 31 and the baffles 2 can move relative to each other.

[0037] The steel tie rod 31 has a pad 32 fixed at both ends, which abuts against the outer surface of the corresponding side baffle 2. The pad 32 has a circular hole 321 that is coaxial with the steel tie rod 31 and has the same diameter. The steel tie rod 31 is welded to the two sides of the pad 32 in the thickness direction by inserting it into the circular hole 321.

[0038] The steel tie rod 31 has a coaxial slotted hole 311 inside, through which a coaxial steel strand 33 is threaded. The steel strand 33 is made of multiple steel wires twisted together. The material of the steel wires is any one of carbon steel, low alloy steel, high alloy steel, and stainless steel. The inner diameter of the slotted hole 311 is 1.2 times the diameter of the steel strand 33. A second anchor 35 is provided on the side of the pad 32 away from the baffle 2. The second anchor 35 abuts against the pad 32. The two ends of the steel strand 33 are respectively anchored to the second anchor 35 on the corresponding side. A helical spring 34 is also connected between the two baffles 2, coaxially sleeved on the steel tie rod 31 and in its natural state.

[0039] A horizontal upper sliding plate 4 and a lower sliding plate 5 are arranged vertically between the two baffles 2. The upper sliding plate 4 and the lower sliding plate 5 are fixed on different baffles 2. A friction energy dissipation block 6 that allows shear deformation is provided between the upper sliding plate 4 and the lower sliding plate 5. The friction energy dissipation block 6 is made of rubber or elastic polymer. The upper and lower ends of the friction energy dissipation block 6 abut against the upper sliding plate 4 and the lower sliding plate 5, respectively. When the upper sliding plate 4 and the lower sliding plate 5 move relative to each other, a large friction force will be generated on the contact surface with the friction energy dissipation block 6, thereby achieving the effect of energy dissipation and vibration reduction.

[0040] The upper sliding plate 4 and the lower sliding plate 5 are respectively provided with downward protruding blocks 7 at the ends that are not connected to the baffle 2. The cross-section of the block 7 along the width direction of the baffle 2 is set as a right-angled triangle, and the side of the block 7 near the friction energy dissipation block 6 is set in the vertical direction.

[0041] Four vertical energy-consuming devices 8 are provided between the upper sliding plate 4 and the lower sliding plate 5. The energy-consuming devices 8 are symmetrically distributed along the length and width of the upper sliding plate 4. The position distribution of the reset device 3 does not affect the normal operation of the energy-consuming devices 8. The position distribution of the energy-consuming devices 8 does not affect the sliding of the friction energy-consuming block 6 along the length of the steel tie rod 31.

[0042] The energy-consuming device 8 includes an upper strip bolt hole 41 and a lower strip bolt hole 51 symmetrically opened on the upper sliding plate 4 and the lower sliding plate 5, respectively, and also includes a screw 81 that vertically penetrates the upper strip bolt hole 41 and the lower strip bolt hole 51, and the screw 81 does not abut against the inner wall of the upper strip bolt hole 41 and the lower strip bolt hole 51.

[0043] The upper and lower ends of the screw 81 are threaded with an upper nut 82 and a lower nut 83, respectively. The upper and lower ends of the screw 81 are also fitted with an upper friction washer 84 and a lower friction washer 85, respectively. The upper and lower surfaces of the upper friction washer 84 abut against the upper bolt and the upper sliding plate 4, respectively. The upper and lower surfaces of the lower friction washer 85 abut against the lower sliding plate 5 and the lower bolt, respectively. The upper strip bolt hole 41 and the lower strip bolt hole 51 are provided so that the screw 81 can drive the upper friction washer 84 and the lower friction washer 85 to slide. The upper friction washer 84 and the lower friction washer 85 generate sliding friction, thereby increasing the energy dissipation capacity of the structure.

[0044] The working principle of the energy-dissipating, vibration-damping, and self-resetting cable device for the large-span prestressed steel structure in this embodiment is as follows: When the cable 1 is tensioned, the cable force increases, thereby driving the two baffles 2 to move in opposite directions, that is, the left baffle 2 moves to the left and the right baffle 2 moves to the right. The movement of the baffles 2 will stretch the steel tie rod 31, thereby tensioning the steel strands 33 inside the steel tie rod 31. In addition, the movement of the baffles 2 will also stretch the helical spring 34 to generate an elastic restoring force.

[0045] like Figures 11 to 12 As shown, assuming the cable force of cable 1 is P after installation, and the initial deformation of the device is x, since the helical spring 34 and steel strand 33 are stretched, we assume the internal force of the helical spring 34 is F, the internal force of the steel strand 33 is T, and the tension of the steel rod 31 is S. At this time, the structure is in equilibrium. Using the isolation method for force analysis, the following equilibrium equations can be listed:

[0046] (1);

[0047] In the formula, n represents the number of steel tie rods 31, the number of helical springs 34, or the number of steel strands 33; m represents the number of energy dissipation devices 8. When the number of steel tie rods 31, helical springs 34, and steel strands 33 are different, different letters are used to represent them; f1 represents the frictional force generated between the friction energy dissipation block 6 and the upper misaligned plate 4 and the lower misaligned plate 5 respectively; f2 represents the frictional force generated between the upper friction pad 84 and the upper misaligned plate 4, and between the lower friction pad 85 and the lower misaligned plate 5.

[0048] When the cable 1 experiences cable slack due to long-term service, P will decrease, and the total force on the right side of the corresponding formula (1) will also decrease. The frictional forces f1 and f2 remain unchanged. Therefore, only the tension of the steel rod 31, the restoring force of the steel strand 33, and the restoring force of the helical spring 34 will decrease. Since the steel strand 33 and the helical spring 34 are in a stretched state, when the external load decreases, the steel strand 33 and the helical spring 34 can automatically contract. The contraction of the steel strand 33 causes the tension of the steel rod 31 to decrease, and the contraction of the helical spring 34 drives the baffle 2 to move in the direction of mutual approach, that is, the left baffle 2 moves to the right and the right baffle 2 moves to the left, so that the cable 1 is put back into a straight state, which can prevent the cable 1 from directly exiting the work.

[0049] When a structure is subjected to external dynamic loads (such as pulsating wind or earthquakes), assuming the cable force increases... Afterwards, the corresponding device will generate The deformation, as can be seen from the deformation coordination, will also cause corresponding deformations in the steel tie rod 31, the steel strand 33, and the helical spring 34. Assuming the tensile force of the deformed steel tie rod 31 changes... The internal force of the coil spring 34 changed. The internal force of the steel strand 33 changed. Finally, the system returns to equilibrium, and the equilibrium equation is as follows:

[0050] (2);

[0051] Combining formulas (1) and (2), we can obtain the following equation:

[0052] (3);

[0053] From the above formula (3), it can be seen that the incremental load The force is converted into the restoring force of the steel strand 33, the tension of the steel tie rod 31, and the restoring force of the helical spring 34. Therefore, after the external load is removed from operation, the device can return to its initial state, thus giving the device a good self-resetting ability.

[0054] During the entire stress deformation process, the helical spring 34 of the device continuously hysteresis and dissipates energy. In addition, the upper friction pad 84, the lower friction pad 85, and the friction energy dissipation block 6 also continuously dissipate energy through friction, which consumes a large amount of externally input energy, thereby achieving the purpose of reducing the dynamic response of the structure.

[0055] It is also worth noting that in this working state, the screw 81 does not contact the upper strip bolt hole 41 and the lower strip bolt hole 51. That is, the screw 81 does not come into contact with the inner wall of the upper strip bolt hole 41 and the lower strip bolt hole 51 at all. For structural safety considerations, when the screw 81 contacts the two ends of the upper strip bolt hole 41 or the lower strip bolt hole 51 in opposite directions, it is considered that the axial force of the cable 1 has reached its peak value, and the structure needs to be maintained in time, because the screw 81 may be sheared if the external load continues to increase.

[0056] Because the energy dissipation capacity of the cables 1 in ordinary large-span prestressed steel structures is insufficient or nonexistent, the large-span prestressed steel structures will exhibit significant dynamic responses under dynamic loads such as pulsating wind or earthquakes. This accelerates fatigue damage or relaxation of the structure or components, shortens the service life of the structure, and increases the risk of structural collapse. By introducing an energy-dissipating, vibration-damping, and self-resetting cable device into the cables 1, the helical spring 34 achieves hysteretic energy dissipation, while the friction energy dissipation block 6 and the energy dissipation device 8 also achieve friction energy dissipation. The two work together to significantly improve the energy dissipation capacity of the cables 1 in large-span prestressed steel structures, effectively absorb externally input energy, reduce the dynamic response of the structure and cables 1, and improve the safety of large-span prestressed steel structures under dynamic loads, as well as extend the service life of the structure.

[0057] Because the self-resetting ability of cables 1 in ordinary large-span prestressed steel structures is relatively weak, or even completely lacking, cable relaxation may occur during long-term service, thus affecting the overall stability of the structure. Furthermore, under accidental vertical loads, the rapid increase in cable force of prestressed cables 1 may cause plastic deformation. The helical spring 34 and steel strand 33 provide cables 1 with good self-resetting ability. This design not only has a significant effect during the stress stage of cables 1, but also has the potential to prevent or mitigate cable relaxation during long-term service, improving the overall stability of the structure. The steel strand 33 in the steel tie rod 31 is always in a tensile state from the start of operation, which is equivalent to providing a large preload to the steel tie rod 31, reducing the stress deformation of the steel tie rod 31 and improving its load-bearing capacity and strength. When the external load increases, the internal forces of the steel strand 33 and helical spring 34 both increase, resulting in a greater self-resetting ability for the cable 1 device. After the external load decreases or disappears, the cable 1 device can automatically return to its initial state.

[0058] The energy-dissipating, vibration-damping, and self-resetting cable device for the large-span prestressed steel structure in this embodiment can not only effectively improve the energy dissipation capacity of cable 1, but also automatically adjust the deformation of cable 1, thereby preventing cable 1 from becoming loose and preventing cable 1 from exiting the working state, thus enhancing the structure's anti-collapse performance. By dissipating externally input energy, reducing the dynamic response of the structure, and utilizing external forces to generate a large self-resetting force within the structure itself, this device is expected to extend the service life of the large-span prestressed steel structure, improve its overall performance, and better cope with the challenges of dynamic loads.

[0059] In addition to the embodiments described above, the present invention may have other implementations. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. A self-resetting cable device for energy dissipation and vibration reduction in large-span prestressed steel structures, characterized in that: It includes two symmetrical baffles (2) for fixing the cable (1), the two baffles (2) are parallel to each other and set in the vertical direction, and an even number of reset devices (3) are vertically connected between the two baffles (2). The reset devices (3) are used to keep the distance between the two baffles (2) unchanged. All reset devices (3) are symmetrically distributed along the height and width directions of the baffles (2). The reset device (3) includes a steel rod (31) that penetrates vertically through the two baffles (2). The two ends of the steel rod (31) are respectively fixed with pads (32) that abut against the outer surface of the corresponding side baffle (2). The steel rod (31) has a coaxial slot (311) inside. A steel strand (33) with its two ends fixed on the corresponding side pad (32) passes through the slot (311). A helical spring (34) is coaxially sleeved on the steel rod (31) and in its natural state between the two baffles (2). A horizontal upper sliding plate (4) and a lower sliding plate (5) are arranged vertically between the two baffles (2). The upper sliding plate (4) and the lower sliding plate (5) are fixed on different baffles (2). A friction energy dissipation block (6) for shear deformation is provided between the upper sliding plate (4) and the lower sliding plate (5). The upper and lower ends of the friction energy dissipation block (6) abut against the upper sliding plate (4) and the lower sliding plate (5) respectively. The ends of the upper sliding plate (4) and the lower sliding plate (5) that are not connected to the baffles (2) are respectively provided with downward protruding blocks (7). An even number of vertical energy-consuming devices (8) are provided between the upper sliding plate (4) and the lower sliding plate (5). The energy-consuming devices (8) are symmetrically distributed along the length and width of the upper sliding plate (4). Each energy-consuming device (8) includes an upper strip bolt hole (41) and a lower strip bolt hole (51) symmetrically opened on the upper sliding plate (4) and the lower sliding plate (5), respectively. It also includes a screw (81) that vertically penetrates the upper strip bolt hole (41) and the lower strip bolt hole (51), and the screw (81) does not abut against the inner wall of the upper strip bolt hole (41) and the lower strip bolt hole (51). The upper and lower ends of the screw (81) are respectively threaded with an upper nut (82) and a lower nut (83). The upper and lower ends of the screw (81) are also respectively fitted with an upper friction pad (84) and a lower friction pad (85). The upper and lower surfaces of the upper friction pad (84) abut against the upper bolt and the upper sliding plate (4) respectively. The upper and lower surfaces of the lower friction pad (85) abut against the lower sliding plate (5) and the lower bolt respectively.

2. The energy-dissipating and vibration-damping self-resetting cable device for a large-span prestressed steel structure according to claim 1, characterized in that: The baffle (2) is a rectangular plate. A pad (9) is provided at the center of the side of the baffle (2) near the friction energy dissipation block (6). A first anchor (10) is provided on the side of the pad (9) near the friction energy dissipation block (6). The cable (1) passes through the baffle (2) and the pad (9) on the same side in sequence and is then anchored to the first anchor (10) on the corresponding side.

3. The energy-dissipating and vibration-damping self-resetting cable device for a large-span prestressed steel structure according to claim 1, characterized in that: The reset device (3) further includes a second anchor (35) for fixing the two ends of the steel strand (33) to the corresponding side pad (32). The second anchor (35) abuts against the side of the pad (32) away from the baffle (2). The steel strand (33) passes through the pad (32) and is anchored to the second anchor (35) on the corresponding side.

4. The energy-dissipating and vibration-damping self-resetting cable device for a large-span prestressed steel structure according to claim 3, characterized in that: The pad (32) has a circular hole (321) that is coaxial with the steel tie rod (31) and has the same diameter. The steel tie rod (31) is welded to the two sides of the pad (32) in the thickness direction by inserting it into the circular hole (321).

5. The energy-dissipating and vibration-damping self-resetting cable device for a large-span prestressed steel structure according to claim 1, characterized in that: The inner diameter of the strip hole (311) is set to 1.2 times the diameter of the steel strand (33).

6. The energy-dissipating and vibration-damping self-resetting cable device for a large-span prestressed steel structure according to claim 1, characterized in that: The baffle (2) has a through hole (21) for the steel tie rod (31) to pass through. The inner diameter of the through hole (21) is 2mm larger than the diameter of the steel tie rod (31), so that the steel tie rod (31) and the baffle (2) can move relative to each other.

7. The energy-dissipating and vibration-damping self-resetting cable device for a large-span prestressed steel structure according to claim 1, characterized in that: The friction energy dissipation block (6) is made of rubber.

8. The energy-dissipating and vibration-damping self-resetting cable device for a large-span prestressed steel structure according to claim 1, characterized in that: The number of reset devices (3) is set to 4, and the number of energy-consuming devices (8) is also set to 4.

9. The energy-dissipating and vibration-damping self-resetting cable device for a large-span prestressed steel structure according to claim 1, characterized in that: The cross-section of the stop block (7) along the width direction of the baffle (2) is set as a right triangle, and the stop block (7) is set in the vertical direction on one side of the friction energy dissipation block (6).

10. The energy-dissipating and vibration-damping self-resetting cable device for a large-span prestressed steel structure according to claim 1, characterized in that: The steel tie rod (31) is made of any one of carbon steel, low alloy steel, high alloy steel and stainless steel; the steel strand (33) is made of multiple steel wires twisted together, and the steel wires are made of any one of carbon steel, low alloy steel, high alloy steel and stainless steel.

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