Friction buckling two-order composite damper

Abstract

The utility model discloses a friction buckling two-order composite damper. The friction buckling two-order composite damper comprises an L-shaped cover plate, a friction steel plate, a conical steel bar, a middle steel plate and a bottom support. The two L-shaped cover plates are connected with the friction steel plate through bolts, the two L-shaped cover plates are connected in a back-to-back mode, the friction steel plate is clamped between the two L-shaped cover plates, bolt holes formed in the friction steel plate are oval holes with long axes in the horizontal direction, and round bolt holes are formed in the back-to-back connecting positions of the two L-shaped cover plates. The diameter of the round bolt hole is smaller than the length of the long axis of the oval hole. When external force is applied, sliding friction occurs between the L-shaped cover plate and the friction steel plate to dissipate energy, when displacement is larger than a non-slip gap, the lower conical steel bar is driven to participate in energy dissipation work, so that rigidity is improved, when displacement reaches yield displacement, the lower conical steel bar enters a plastic deformation stage, and stable energy dissipation continues along with increase of displacement. Therefore, damage to structural members is reduced, and the effect of protecting a main body structure is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of two-stage composite dampers of friction buckling, which can be used as supporting members in fabricated frame, and also can be used in corresponding reinforcement field. BACKGROUND

[0002] As one of the disasters with extremely destructive power in nature, earthquakes pose a severe challenge to the safety and stability of building structures. Although traditional building structure design has taken into account certain seismic measures, under the action of strong earthquakes, the inherent damping of the structure often fails to effectively dissipate all the input seismic energy, which may lead to serious damage or even collapse of the structure.

[0003] In order to improve the seismic performance of building structures, the innovative technology of energy dissipation damper is introduced in modern seismic design concept. The energy dissipation damper utilizes its own hysteretic characteristics to absorb and dissipate the energy transmitted to the structure by seismic waves when an earthquake occurs, thereby reducing the seismic response of the structure. This mechanism is equivalent to installing buckling energy dissipation components at some specific parts of the building structure, which can significantly improve the damping ratio of the structure while increasing the stiffness of the structure body, effectively reducing the displacement and acceleration response of the structure. However, the damper with a single yielding mechanism has a significantly reduced stiffness after yielding, resulting in an increase in lateral deformation of the structure under strong earthquakes, which may cause excessive deformation damage to non-structural components or structural components, and is not conducive to post-earthquake repair.

[0004] To solve the above problems, the utility model provides a kind of two-stage composite dampers of friction buckling. Two L-shaped cover plates are designed on the upper part of the component and connected to the friction steel plate by bolts, which not only facilitates installation and disassembly, but also provides sufficient connection strength to ensure that the damper will not be damaged under stress. To ensure the symmetry of the structure, four tapered steel rods are provided at the lower part of the component. The lower tapered steel rods are connected to the friction steel plate through the middle steel plate, which enhances the integrity and stability of the damper, allowing the lower tapered steel rods to more effectively transfer and dissipate energy when they are in operation. The cover plate is connected to the bottom of the H-shaped steel beam by bolts, and has two-stage energy dissipation mode to dissipate energy. When subjected to external force, the cover plate and the friction steel plate slide and rub to dissipate energy. When the displacement is greater than the slip clearance, the lower tapered steel rods are activated to increase the stiffness. When the yield point is reached, the lower tapered steel rods enter the plastic deformation stage to continue to dissipate energy stably. The damper significantly reduces the damage suffered by the structural components by combining friction energy dissipation and metal buckling energy dissipation, thereby effectively protecting the integrity and safety of the main structure. Compared with existing dampers, the damper has a simple structure and reliable connection, so the maintenance cost is low during use, and it is easy to check and replace. Its energy dissipation mechanism is intuitive and clear, and can achieve the effects of phased yielding, two-stage energy dissipation and stiffness enhancement. SUMMARY

[0005] The frictional buckling two-stage composite damper has the characteristics of simple assembly, easy material selection, simple manufacturing, energy dissipation of double stages, energy dissipation by relative sliding of the frictional steel plate in the early stage, participation of the conical steel rod in work when the displacement is greater than the anti-slip gap, continuous energy dissipation after yielding, and the characteristics of phased yielding, double-stage energy dissipation and stiffness improvement.

[0006] A frictional buckling two-stage composite damper, comprising L-shaped cover plates (1), frictional steel plates (2), conical steel rods (3), middle steel plates (4) and bottom supports (6); the two L-shaped cover plates (1) and the frictional steel plates (2) are connected by bolts, the two L-shaped cover plates (1) are connected back to back and the frictional steel plates (2) are clamped in the middle, bolt holes provided in the frictional steel plates (2) are oval holes (7) with a horizontal direction as a long axis, circular bolt holes are provided at positions where the two L-shaped cover plates (1) are connected back to back, and the diameter of the circular bolt holes is smaller than the length of the long axis of the oval holes (7).

[0007] The frictional buckling two-stage composite damper has the characteristics of simple assembly, easy material selection, simple manufacturing, energy dissipation of double stages, energy dissipation by relative sliding of the frictional steel plate in the early stage, participation of the conical steel rod in work when the displacement is greater than the anti-slip gap, continuous energy dissipation after yielding, and the characteristics of phased yielding, double-stage energy dissipation and stiffness improvement.

[0008] The frictional buckling two-stage composite damper has the characteristics of simple assembly, easy material selection, simple manufacturing, energy dissipation of double stages, energy dissipation by relative sliding of the frictional steel plate in the early stage, participation of the conical steel rod in work when the displacement is greater than the anti-slip gap, continuous energy dissipation after yielding, and the characteristics of phased yielding, double-stage energy dissipation and stiffness improvement.

[0009] The frictional buckling two-stage composite damper has the characteristics of simple assembly, easy material selection, simple manufacturing, energy dissipation of double stages, energy dissipation by relative sliding of the frictional steel plate in the early stage, participation of the conical steel rod in work when the displacement is greater than the anti-slip gap, continuous energy dissipation after yielding, and the characteristics of phased yielding, double-stage energy dissipation and stiffness improvement.

[0010] The frictional buckling two-stage composite damper has the characteristics of simple assembly, easy material selection, simple manufacturing, energy dissipation of double stages, energy dissipation by relative sliding of the frictional steel plate in the early stage, participation of the conical steel rod in work when the displacement is greater than the anti-slip gap, continuous energy dissipation after yielding, and the characteristics of phased yielding, double-stage energy dissipation and stiffness improvement.

[0011] The frictional buckling two-stage composite damper has the characteristics of simple assembly, easy material selection, simple manufacturing, energy dissipation of double stages, energy dissipation by relative sliding of the frictional steel plate in the early stage, participation of the conical steel rod in work when the displacement is greater than the anti-slip gap, continuous energy dissipation after yielding, and the characteristics of phased yielding, double-stage energy dissipation and stiffness improvement.

[0012] This utility model provides a two-stage composite damper for friction buckling. When subjected to external force, the L-shaped cover plate and the friction steel plate engage in sliding friction to dissipate energy. When the displacement exceeds the anti-slip gap, the lower conical steel rod is driven to participate in energy dissipation, thereby increasing stiffness. When the yield point is reached, the lower conical steel rod enters the plastic deformation stage, continuing to stably dissipate energy, thus reducing damage to structural components and protecting the main structure. It achieves the characteristics of staged yielding, two-stage energy dissipation, and further stiffness enhancement. Attached Figure Description

[0013] Figure 1 This is a front view of a support component for a two-stage composite damper with friction buckling according to the present invention.

[0014] Figure 2 This is a side view of a support component for a two-stage composite damper with friction buckling according to the present invention.

[0015] Figure 3 This is a top view of a two-stage composite damper support component for friction buckling according to the present invention.

[0016] Figure 4 for Figure 1 AA section view in the middle;

[0017] Figure 5 for Figure 1 BB cross-section diagram in the middle;

[0018] Figure 6 for Figure 1 CC cross-section view in the middle;

[0019] Figure 7 This is an equivalent model for finite element simulation.

[0020] Figure 8 The hysteresis curve is obtained from finite element simulation.

[0021] In the diagram: 1. L-shaped cover plate, 2. Friction steel plate, 3. Conical steel bar, 4. Middle steel plate, 5. Bolt, 6. Bottom support, 7. Elliptical hole, 8. Friction damper. Detailed Implementation

[0022] The present invention will be described in detail below with reference to specific embodiments.

[0023] like Figures 1-4As shown, a two-stage composite damper of frictional buckling includes an L-shaped cover plate (1), a friction steel plate (2), a conical steel rod (3), a middle steel plate (4), a bolt (5), and a bottom support (6). The two L-shaped cover plates (1) and the friction steel plate (2) are connected by the bolt (5), the two L-shaped cover plates (1) are connected back to back, and the friction steel plate (2) is clamped in the middle. The bolt hole in the friction steel plate (2) is an oval hole 7 with a long axis in the horizontal direction, similar to a runway-shaped bolt hole. Two circular bolt holes are provided in the two L-shaped cover plates (1), and the diameter of the circular bolt hole is smaller than the length of the long axis of the oval hole 7. In this way, under the action of horizontal reciprocating force, sliding displacement can occur between the L-shaped cover plate (1) and the friction steel plate (2), and energy can be dissipated through sliding friction between the two.

[0024] The conical steel rod (3) is provided with four conical steel rods (3), one end of the four conical steel rods (3) is fixed to the lower surface of the middle steel plate (4), the friction steel plate (2) is fixed to the lower surface of the middle steel plate (4), for example, the connection can be achieved by welding, the other end of the four conical steel rods (3) is welded to the bottom support (6), and two bolt holes are provided in the top of each L-shaped cover plate (1). During use, the two L-shaped cover plates (1) are fixedly connected to the bottom of the H-shaped steel beam by four bolts 5.

[0025] Each conical steel rod (3) includes two conical steel rods, the tips of the two conical steel rods are fixed together, the ratio of the diameter of the end of the conical steel rod (3) to the middle diameter is greater than 3.2:1, and the ratio of the length of the conical steel rod (3) to the end diameter is greater than 4:1.

[0026] The thickness of the L-shaped cover plate (1) and the friction steel plate (2) is 8mm-15mm.

[0027] When subjected to external force, such as finite element model analysis Figure 7 As shown, through finite element simulation, the ratio of the length of the conical steel rod (3) to the end diameter is greater than 4:1. Based on the data of damper test, the friction coefficient between the L-shaped cover plate (1) and the friction steel plate (2) is 0.2-0.25, and the friction force is adjusted by adjusting the pre-tightening force of the bolt (5) between the L-shaped cover plate (1) and the friction steel plate (2). The control condition of the damper is formula (1):

[0028]

[0029] In the formula, f is the yield strength of the conical steel rod (3) steel material, d is the diameter of the end of the conical steel rod (3), h is the length of the conical steel rod (3), N is the pre-tightening force of the bolt (5), and μ is the friction coefficient between the L-shaped cover plate (1) and the friction steel plate (2).

[0030] The L-shaped cover plate and the friction steel plate slide to dissipate energy; when the displacement is greater than the anti-slip gap, the lower conical steel rod is driven to participate in the energy dissipation work, thereby increasing the stiffness, and when reaching the yield point, the lower conical steel rod enters the plastic deformation stage to continue to stably dissipate energy, thereby reducing the damage of the structural member and achieving the effect of protecting the main structure. The hysteresis curve of the frictional buckling two-stage composite damper is shown in Figure 8 The hysteresis curve of the frictional buckling two-stage composite damper is shown in

[0031] It should be understood that the above description can be improved or changed by those skilled in the art, and all such improvements and changes shall fall within the protection scope of the appended claims of the present application.

Claims

1. A frictional buckling two-stage compound damper characterized by, It includes L-shaped cover plate (1), friction steel plate (2), conical steel rod (3), middle steel plate (4), bottom support (6), two L-shaped cover plate (1) and friction steel plate (2) are connected by bolts, two L-shaped cover plate (1) back-to-back connection, and the friction steel plate (2) is clamped in the middle, the bolt hole of the friction steel plate (2) is the long axis of the horizontal direction oval hole (7), two L-shaped cover plate (1) back-to-back connection position is set up round bolt hole, the diameter of the round bolt hole is less than the long axis length of the oval hole (7).

2. The frictional buckling two-stage compound damper according to claim 1, wherein Four conical steel rods (3) are arranged, one end of the four conical steel rods (3) is fixed on the lower surface of the middle steel plate (4), the friction steel plate (2) is fixed on the lower surface of the middle steel plate (4), the other end of the four conical steel rods (3) is welded with the bottom support (6).

3. The frictional buckling two-stage compound damper according to claim 1, wherein Two bolt holes are set up on the top of each L-shaped cover plate (1), two L-shaped cover plate (1) are fixed and connected on the H-shaped steel beam bottom by four bolts in use.

4. The frictional buckling two-stage compound damper according to claim 1, wherein Each conical steel rod (3) includes two conical steel rods, two conical steel rods are fixed together at the tip.

5. The frictional buckling two-stage compound damper according to claim 1, wherein The ratio of the diameter of the end of the conical steel rod (3) to the middle diameter is greater than 3.2:1, and the ratio of the length of the conical steel rod (3) to the end diameter is greater than 4:

1.

6. The frictional buckling two-stage compound damper according to claim 1, wherein The thickness of the L-shaped cover plate (1) and the friction steel plate (2) is 8mm-15mm.

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