A vibration damping beam based on a non-linear energy sink

Abstract

The present application relates to a kind of vibration damping beams based on nonlinear energy sink, belong to building technology field, vibration damping beam includes: main beam, including first I-shaped steel beam and the first straw board being arranged around the outer periphery of first I-shaped steel beam, first I-shaped steel beam is installed with horizontal vibration absorption component and vertical vibration absorption component;Horizontal vibration absorption component includes horizontal oscillator and first elastic member, horizontal oscillator can move along the extension direction of first I-shaped steel beam, one end of first elastic member is connected with horizontal oscillator, the other end is connected with first I-shaped steel beam;Vertical vibration absorption component includes vertical oscillator and second elastic member, vertical oscillator can move in the longitudinal section of first I-shaped steel beam, one end of second elastic member is connected with vertical oscillator, the other end is connected with first I-shaped steel beam;Sub-beam, connected with main beam, sub-beam includes second I-shaped steel beam and the second straw board being arranged around the outer periphery of second I-shaped steel beam, second I-shaped steel beam is installed with negative stiffness nonlinear energy sink.

Description

Technical Field

[0001] This invention relates to the field of building technology, and in particular to a vibration-damping beam based on a nonlinear energy trap. Background Technology

[0002] Modern buildings are increasingly adopting green building materials. Currently, the most commonly used building materials are steel combined with concrete. The main beams and secondary beams are connected by welding, and the entire beam structure is made of rigid materials. This results in poor sound insulation and environmental protection. When an earthquake occurs, the building structure vibrates significantly and has poor earthquake resistance. Summary of the Invention

[0003] This invention provides a vibration-damping beam based on a nonlinear energy trap to address the shortcomings of poor seismic resistance in existing beam structures.

[0004] This invention provides a vibration-damping beam based on a nonlinear energy trap, comprising:

[0005] The main beam includes a first I-beam and a first straw board. The first straw board is arranged around the outer periphery of the first I-beam. A horizontal vibration-absorbing assembly and a vertical vibration-absorbing assembly are installed inside the first I-beam. The horizontal vibration-absorbing assembly includes a horizontal vibrator and a first elastic element. The horizontal vibrator is movable along the extension direction of the first I-beam. One end of the first elastic element is connected to the horizontal vibrator, and the other end is connected to the first I-beam. The vertical vibration-absorbing assembly includes a vertical vibrator and a second elastic element. The vertical vibrator is movable within the longitudinal section of the first I-beam. One end of the second elastic element is connected to the vertical vibrator, and the other end is connected to the first I-beam.

[0006] The secondary beam is connected to the main beam. The secondary beam includes a second I-beam and a second straw plate. The second straw plate is arranged around the outer periphery of the second I-beam. A negative stiffness nonlinear energy trap is installed inside the second I-beam.

[0007] According to the present invention, a vibration damping beam for a nonlinear energy trap is provided, wherein the first I-beam includes a first cold-formed thin-walled steel section and a second cold-formed thin-walled steel section, the first cold-formed thin-walled steel section and the second cold-formed thin-walled steel section are welded back to back to form an I-beam with flanges, and the first straw board is bonded to the outer periphery of the first I-beam.

[0008] According to the present invention, a vibration damping beam for a nonlinear energy trap further includes a vertical track connecting the upper and lower flanges of the first I-beam. The vertical vibrator is slidably mounted on the vertical track. Two first elastic elements are respectively mounted on opposite sides of the vertical vibrator. The two first elastic elements located on the same side of the vertical vibrator are symmetrically arranged with respect to the vertical track.

[0009] According to the present invention, a vibration damping beam for a nonlinear energy trap further includes transverse reinforcing ribs, which are fixed to the upper and lower flanges of the first I-beam. A horizontal track is fixedly connected between the two transverse reinforcing ribs, and the horizontal vibrator is slidably mounted on the horizontal track. Two second elastic members are respectively installed on opposite sides of the horizontal track along its direction of movement.

[0010] According to the present invention, a vibration damping beam for a nonlinear energy trap is provided, wherein silicone damping is installed at the connection between the end of the secondary beam and the main beam.

[0011] According to the present invention, a vibration damping beam for a nonlinear energy trap is provided, wherein the main beam and the secondary beam are connected by a main-secondary beam node connector.

[0012] According to the present invention, a vibration-damping beam for a nonlinear energy trap is provided, wherein the horizontal vibration-absorbing components and the vertical vibration-absorbing components are uniformly arranged along the length direction of the first I-beam, and the arrangement density of the horizontal vibration-absorbing components and the vertical vibration-absorbing components is increased at the end supports of the main beam and at the mid-span of the main beam.

[0013] According to the present invention, a vibration damping beam for a nonlinear energy trap includes a negative stiffness spring and a guide rail. The guide rail is fixed to the lower part of the upper flange of the second I-beam. One end of the negative stiffness spring is connected to the guide rail, and the other end is connected to the second I-beam.

[0014] According to the present invention, a vibration damping beam with a nonlinear energy trap is provided, wherein the negative stiffness nonlinear energy trap is evenly distributed along the extension direction of the second I-beam, and the distribution density is increased at the end beam support and the mid-span of the second I-beam.

[0015] According to the present invention, a vibration damping beam for a nonlinear energy trap is provided, wherein the second straw board is bonded to the outer periphery of the second I-beam.

[0016] The vibration-damping beam based on a nonlinear energy trap provided by this invention, by setting horizontal vibration-absorbing components, vertical vibration-absorbing components, and a negative rigid nonlinear energy trap on the beam, can provide vibration reduction for the structure from the moment it is subjected to external forces. Furthermore, the horizontal vibration-absorbing components, vertical vibration-absorbing components, and negative rigid nonlinear energy trap exhibit good robustness, maintaining a good vibration-damping effect even when the structural dynamic characteristics change. This effectively prevents the phenomenon of structural collapse due to column failure without the vibration dampers activating. In addition, both the main beam and secondary beams include straw boards. Utilizing the lightweight and high-strength characteristics of straw boards, the load-bearing capacity and stability of the vibration-damping beam can be effectively enhanced. The straw boards also improve the heat insulation and thermal insulation effects of the vibration-damping beam, improving building comfort. Moreover, the flame-retardant properties of the straw boards effectively prevent fires and improve building safety. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the main beam in the vibration-damping beam based on a nonlinear energy trap provided in an embodiment of the present invention.

[0019] Figure 2 This is a right view of the main beam in an embodiment of the present invention.

[0020] Figure 3 This is a front view of the main beam in an embodiment of the present invention.

[0021] Figure 4 This is a structural plan view of the secondary beam in the vibration-damping beam based on the nonlinear energy trap provided in this embodiment of the invention.

[0022] Figure 5 yes Figure 4 The diagram shows a cross-sectional view of the secondary beam.

[0023] Figure label:

[0024] 1. First straw board; 11. Horizontal straw board; 12. Vertical straw board; 2. First I-beam; 21. First cold-formed thin-walled steel section; 22. Second cold-formed thin-walled steel section; 3. Vertical vibration absorption assembly; 31. Vertical track; 32. Vertical vibrator; 33. Second elastic element; 4. Horizontal vibration absorption assembly; 41. Horizontal track; 42. Horizontal vibrator; 43. First elastic element; 5. Transverse reinforcing rib; 6. Negative stiffness nonlinear energy trap; 61. Second I-beam; 62. Guide rail; 63. Negative stiffness spring; 7. Main and secondary beam node connectors; 71. Weld; 72. Bolt; 8. Silicone damping; 9. Second straw board. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0026] The terms "first" and "second" in the specification and claims of this invention may explicitly or implicitly include one or more of those features. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0027] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] The following is combined Figures 1-5 The present invention describes a vibration-damping beam based on a nonlinear energy trap.

[0030] Reference Figure 1 and Figure 4 This invention provides a vibration-damping beam based on a nonlinear energy trap, comprising a main beam and a secondary beam connected to the main beam. The main beam includes a first I-beam 2 and a first straw plate 1 surrounding the outer periphery of the first I-beam 2. A vertical vibration-absorbing component 3 and a horizontal vibration-absorbing component 4 are installed within the first I-beam 2. The secondary beam includes a second I-beam 61 and a second straw plate 9 surrounding the outer periphery of the second I-beam 61. A negative stiffness nonlinear energy trap 6 is installed within the second I-beam 61.

[0031] like Figure 1 and Figure 2 As shown, the horizontal vibration damping assembly 4 includes a horizontal vibrator 42 and a first elastic element 43. The horizontal vibrator 42 is movable along the extending direction of the first I-beam 2. One end of the first elastic element 43 is connected to the horizontal vibrator 42, and the other end is connected to the first I-beam 2. Figure 1 and Figure 3 As shown, the vertical vibration absorption assembly 3 includes a vertical vibrator 32 and a second elastic element 33. The vertical vibrator 32 is movable within the longitudinal section of the first I-beam 2. One end of the second elastic element 33 is connected to the vertical vibrator 32, and the other end is connected to the first I-beam 2.

[0032] Because straw boards are lightweight and high-strength, they can effectively enhance the load-bearing capacity and stability of beams. Furthermore, straw boards also have certain heat insulation and thermal insulation effects, improving building comfort. Additionally, steel has poor fire resistance and softens when exposed to fire, while straw boards have flame-retardant properties, effectively preventing fires and improving building safety. The vibration-damping beam based on a nonlinear energy trap provided in this embodiment of the invention includes straw boards in both the main and secondary beams, thereby improving the safety, comfort, and stability of the building.

[0033] Current structural design follows the "strong column, weak beam" principle, artificially amplifying the design bending moment of columns while leaving the beams unchanged. After adjustment, the bending resistance of columns is stronger than before, while the beams remain the same. This means the column's capacity is increased more than the beam's. Therefore, when beams and columns are subjected to stress together, the beam ends usually yield before the columns. By placing horizontal vibration-absorbing components 4, vertical vibration-absorbing components 3, and negative rigid nonlinear energy traps on the beams, vibration reduction can be achieved from the moment external forces are applied. Furthermore, the horizontal vibration-absorbing components 4, vertical vibration-absorbing components 3, and negative rigid nonlinear energy traps exhibit good robustness, maintaining a good vibration reduction effect even when the structural dynamic characteristics change. This effectively prevents the structural collapse that occurs when columns fail, even if the vibration dampers fail to activate.

[0034] The first I-beam 2 is equipped with a horizontal vibration absorption component 4 and a vertical vibration absorption component 3, and the secondary beam is equipped with a negative stiffness nonlinear energy trap 6. When subjected to vibrations caused by an earthquake, the horizontal vibration absorption component 4, the vertical vibration absorption component 3 and the negative stiffness nonlinear energy trap 6 can generate nonlinear restoring force, so that it can still maintain a good vibration reduction effect when the dynamic characteristics of the structure change.

[0035] Specifically, such as Figure 1 As shown, the main beam comprises a first cold-formed thin-walled steel section 21 and a second cold-formed thin-walled steel section 22, which are welded back-to-back to form an I-shaped steel beam with flanges. A first straw board 1 is adhered to the outer surface of the first I-shaped steel beam 2 using adhesive, thereby providing the first I-shaped steel beam 2 with better load-bearing capacity, stability, sound insulation, and thermal insulation performance.

[0036] like Figure 1 As shown, the first straw board 1 includes a horizontal straw board 11 and a vertical straw board 12. One horizontal straw board 11 is attached to the outer side of the first cold-formed thin-walled steel section 21, and the other horizontal straw board 11 is attached to the outer side of the second cold-formed thin-walled steel section 22. The outer sides of the first cold-formed thin-walled steel section 21 and the second cold-formed thin-walled steel section 22 are both flat plates with folded edges on opposite sides. One vertical straw board 12 is attached to the folded edge of the first cold-formed thin-walled steel section 21 and the second cold-formed thin-walled steel section 22 located on the same side, and the other vertical straw board 12 is attached to the other folded edge of the first cold-formed thin-walled steel section 21 and the second cold-formed thin-walled steel section 22 located on the same side. Thus, the first straw board 1 is arranged around the first I-beam 2.

[0037] A vertical track 31 is provided on one side of the web of the first I-beam 2, and a vertical vibrator 32 is slidably installed on the vertical track 31. Two first elastic elements 43 are respectively installed on opposite sides of the vertical vibrator 32, and the two first elastic elements 43 located on the same side of the vertical vibrator 32 are symmetrically arranged with respect to the vertical track 31.

[0038] like Figure 1 and Figure 3 As shown, two vertical tracks 31 are arranged in parallel, and the vertical vibrator 32 is slidably sleeved on the two vertical tracks 31. The first elastic element 43 is a compression spring or a tension spring. Four first elastic elements 43 are respectively arranged on the upper and lower sides of the vertical vibrator 32.

[0039] When vertical seismic forces affect the vibration-damping beam, the vertical vibrator 32 vibrates along the vertical track 31. At this time, the first elastic element 43 will generate a negative incremental restoring force, which weakens the response of the vibration-damping beam to vertical seismic forces and improves the safety of the vibration-damping beam.

[0040] like Figure 1 and Figure 2 As shown, the first I-beam 2 is provided with transverse reinforcing ribs 5, and a horizontal track 41 is provided between the transverse reinforcing ribs 5. The horizontal vibrator 42 slides along the horizontal track 41. Figure 1 and Figure 2 As shown, two horizontal tracks 41 are arranged in parallel, and a horizontal vibrator 42 is slidably mounted on the two horizontal tracks 41. Four compression springs are connected around the horizontal vibrator 42 as second elastic elements 33. When a horizontal seismic action affects the vibration-damping beam, the horizontal vibrator 42 vibrates along the horizontal tracks 41. At this time, the second elastic elements 33 will generate a negative incremental restoring force, which weakens the response of the vibration-damping beam to the horizontal seismic action.

[0041] The horizontal vibration-absorbing components 4 and the vertical vibration-absorbing components 3 are arranged on opposite sides or the same side of the web of the first I-beam 2. To improve the vibration reduction effect of the vibration-damping beam, horizontal vibration-absorbing components 4 are provided on opposite sides of the web of the first I-beam 2, and multiple horizontal vibration-absorbing components 4 are spaced apart along the length of the first I-beam 2 on one side of the web. Similarly, multiple vertical vibration-absorbing components 3 are spaced apart along the length of the first I-beam 2 on each side of the web.

[0042] Since the vibration damping beam bears a large load at the end support and mid-span of the beam, the vertical vibration absorption components 3 and the horizontal vibration absorption components 4 are evenly arranged along the span direction of the first I-beam 2, and the arrangement density is increased at the end support and mid-span of the first I-beam 2 to prevent the weak points of the steel beam from being damaged under the action of earthquake.

[0043] The secondary beams have the same structure as the main beams, such as... Figure 4 and Figure 5As shown, the structure includes a second I-beam 61 and a second straw plate 9 surrounding the outer periphery of the second I-beam 61. Specifically, the second I-beam 61 serves as a skeletal support structure within the space enclosed by the second straw plate 9. The second I-beam 61 acts as an oscillator in the secondary beam, and a guide rail 62 is installed along the span of the secondary beam on the lower part of the upper flange of the second I-beam 61. A negative stiffness spring 63 connects the second I-beam 61 and the guide rail 62. When a horizontal seismic action affects the vibration-damping beam, the oscillator vibrates along the track. At this time, the compressed spring generates a negative incremental restoring force, weakening the response of the oscillator.

[0044] Similarly, the weak sections of the secondary beam are usually located at the beam end supports and the mid-span section. By setting multiple negative stiffness springs 63 to form multiple negative stiffness nonlinear energy traps 6 at the weak points, it is more likely that they can fully play their vibration reduction role.

[0045] Treating the secondary beam as a whole as a vibrator, without adding an additional vibrator, reduces the weight of the structure, facilitates construction, and can effectively reduce vibration.

[0046] like Figure 4 and Figure 5 As shown, the main beam and secondary beam are connected by a main-secondary beam node connector 7. The main-secondary beam node connector 7 includes a weld 71 and bolts 72. Figure 5 As shown, the end of the second I-beam 61 has multiple rows of screw holes. Each row has five screw holes along the width of the second I-beam 61, and five bolts 72 are respectively inserted into the five screw holes to connect the second I-beam 61 to the first I-beam 2. The abutment of the second I-beam 61 and the first I-beam 2 is welded together to form a weld 71. In the event of an earthquake, the load is borne by the weld 71 and the bolts 72. In the event of a rare earthquake, the ordinary bolts 72 and the weld 71 may break due to insufficient load-bearing capacity.

[0047] The vibration-damping beam provided in this embodiment of the invention has a silicone damper 8 installed at the connection between the end of the secondary beam and the main beam. The silicone damper 8 at the end of the secondary beam forms a rotatable plastic hinge. When an earthquake occurs, the silicone damper 8 begins to dissipate energy, thereby reducing the damage of the earthquake to the structure.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vibration-damping beam for a nonlinear energy trap, characterized in that, include: The main beam includes a first I-beam and a first straw board. The first straw board is arranged around the outer periphery of the first I-beam. A horizontal vibration-absorbing assembly and a vertical vibration-absorbing assembly are installed inside the first I-beam. The horizontal vibration-absorbing assembly includes a horizontal vibrator and a first elastic element. The horizontal vibrator is movable along the extension direction of the first I-beam. One end of the first elastic element is connected to the horizontal vibrator, and the other end is connected to the first I-beam. The vertical vibration-absorbing assembly includes a vertical vibrator and a second elastic element. The vertical vibrator is movable within the longitudinal section of the first I-beam. One end of the second elastic element is connected to the vertical vibrator, and the other end is connected to the first I-beam. The secondary beam is connected to the main beam. The secondary beam includes a second I-beam and a second straw board. The second straw board is arranged around the outer periphery of the second I-beam. A negative stiffness nonlinear energy trap is installed inside the second I-beam. The negative stiffness nonlinear energy trap includes a negative stiffness spring and a guide rail. The guide rail is fixed to the lower part of the upper flange of the second I-beam. One end of the negative stiffness spring is connected to the guide rail, and the other end is connected to the second I-beam.

2. The vibration-damping beam of the nonlinear energy trap according to claim 1, characterized in that, The first I-beam includes a first cold-formed thin-walled steel section and a second cold-formed thin-walled steel section. The first cold-formed thin-walled steel section and the second cold-formed thin-walled steel section are welded back to back to form an I-beam with flanges. The first straw board is bonded to the outer periphery of the first I-beam.

3. The vibration-damping beam of the nonlinear energy trap according to claim 1, characterized in that, It also includes a vertical track connecting the upper and lower flanges of the first I-beam, the vertical vibrator being slidably mounted on the vertical track, and two first elastic elements being mounted on opposite sides of the vertical vibrator, with the two first elastic elements located on the same side of the vertical vibrator being symmetrically arranged with respect to the vertical track.

4. The vibration-damping beam of the nonlinear energy trap according to claim 1, characterized in that, It also includes transverse reinforcing ribs, which are fixed to the upper and lower flanges of the first I-beam. A horizontal rail is fixedly connected between the two transverse reinforcing ribs. The horizontal vibrator is slidably mounted on the horizontal rail. Two second elastic elements are respectively installed on opposite sides of the horizontal rail along its direction of movement.

5. The vibration-damping beam of the nonlinear energy trap according to claim 1, characterized in that, Silicone damping is installed at the connection between the end of the secondary beam and the main beam.

6. The vibration-damping beam of the nonlinear energy trap according to claim 1 or 5, characterized in that, The main beam and the secondary beam are connected by a main-secondary beam node connector.

7. The vibration-damping beam of the nonlinear energy trap according to claim 1, characterized in that, The horizontal and vertical vibration-absorbing components are evenly arranged along the length of the first I-beam, and the density of the horizontal and vertical vibration-absorbing components is increased at the end supports of the main beam and at the mid-span of the main beam.

8. The vibration-damping beam of the nonlinear energy trap according to claim 1, characterized in that, The negative stiffness nonlinear energy traps are evenly distributed along the extension direction of the second I-beam, with increased density at the end supports and mid-span of the second I-beam.

9. The vibration-damping beam of the nonlinear energy trap according to claim 1, characterized in that, The second straw board is bonded to the outer periphery of the second I-beam.

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