CN113309813B - Semi-active vibration absorption and energy dissipation control system for restraining vortex-induced vibration of bridge - Google Patents
Semi-active vibration absorption and energy dissipation control system for restraining vortex-induced vibration of bridge Download PDFInfo
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- CN113309813B CN113309813B CN202110607188.6A CN202110607188A CN113309813B CN 113309813 B CN113309813 B CN 113309813B CN 202110607188 A CN202110607188 A CN 202110607188A CN 113309813 B CN113309813 B CN 113309813B
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- 230000000452 restraining effect Effects 0.000 title claims description 7
- 230000002829 reductive effect Effects 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000004677 Nylon Substances 0.000 claims abstract description 5
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- 230000000694 effects Effects 0.000 claims description 6
- 230000009022 nonlinear effect Effects 0.000 claims description 4
- 238000013016 damping Methods 0.000 abstract description 5
- 230000002401 inhibitory effect Effects 0.000 abstract description 4
- 229910052751 metal Inorganic materials 0.000 description 7
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
- F16F15/06—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs
- F16F15/067—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs using only wound springs
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
- F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/28—Counterweights, i.e. additional weights counterbalancing inertia forces induced by the reciprocating movement of masses in the system, e.g. of pistons attached to an engine crankshaft; Attaching or mounting same
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Abstract
The invention belongs to the technical field of wind-induced vibration control of bridges, and provides a semi-active vibration absorption and energy dissipation control system for inhibiting vortex-induced vibration of a bridge, which has the advantages and characteristics compared with the traditional tuned mass damping system: (1) the spring is horizontally arranged at the bottom of the beam, the length is not limited, and the requirement of low-frequency target frequency can be met; (2) the multiple springs in series and parallel connection can realize different target frequencies through different combinations, and meet the control requirements of multi-stage vortex vibration; (3) the fiber reinforced nylon material spring is adopted, and the slotting treatment is carried out on the spring, so that the frequency implementation range can be greatly widened; (4) the material and the form of the mass body are not limited, a water bag can be adopted, the cost is low, and the disassembly, the assembly and the quality adjustment are convenient; (5) the pulleys with different coaxial diameters are adopted, so that the high-frequency vibration control efficiency can be obviously improved; (6) the vibration of the mass body is controlled through manual semi-automatic intervention, so that higher control efficiency is realized; (7) the device is small in size and is arranged at the bottom of the beam, so that the appearance is basically not influenced; (8) the engineering cost is greatly reduced.
Description
Technical Field
The invention belongs to the technical field of wind-induced vibration control of bridges, and relates to a semi-active vibration absorption and energy dissipation control system for inhibiting vortex-induced vibration of a bridge.
Background
Vortex-induced vibration (vortex vibration for short) of a large-span bridge sometimes occurs, adverse effects are caused to a bridge structure and drivers and passengers on the bridge, and even social panic is caused, so that the vortex-induced vibration needs to be prevented and controlled. The large-span bridge is generally vertical bending vortex vibration, and torsional vortex vibration happens rarely. Moreover, even with torsional vortex vibration, the amplitude is generally small and the problem is not serious. The tuned mass damper can be used for controlling the vibration of the bridge, however, the vertical bending vortex vibration frequency of the bridge is low (<0.2Hz, even lower than 0.1Hz), so that the adoption of the tuned mass damper requires that the stretching or compressing length of a spring reaches several meters or even dozens of meters, the lower the frequency is, the smaller the corresponding system stiffness is, the longer the spring is required (in a square relation with the vibration period), the larger the mass is, and the higher the cost is. On the one hand, the main beam is difficult to directly install, and on the other hand, the traditional metal spring is adopted, so that the mass of the metal spring is very large, dozens of tons of the metal spring are reached, and the applicability of the metal spring is greatly reduced. Therefore, the conventional tuned mass dampers currently available are generally only used in situations where the vibration frequency is higher than 0.2 Hz. In summary, it is necessary to provide more advanced, more applicable and more economical mechanical measures for vortex vibration control through intensive research.
Disclosure of Invention
The invention provides a semi-active vibration absorption and energy dissipation control system for inhibiting bridge vortex vibration. Aiming at the characteristics of low vertical vortex vibration frequency, possible multi-order vortex vibration and wide frequency band of a long-span bridge, the traditional tuned mass damper is improved in multiple aspects, so that the tuned mass damper is more convenient, economic, efficient and practical. The specific invention contents and the advantages and the characteristics thereof are as follows: the springs are horizontally arranged at the bottom of the main beam instead of being vertically suspended inside the box beam, so that the springs are not limited by space any more, have any length and can realize any vibration frequency; the horizontally arranged springs can be divided into a plurality of sections, different system target stiffness can be realized by selecting different lengths, and further the vibration frequency can be adjusted in a large range, so that the multi-stage vortex vibration control device can be conveniently suitable for controlling multi-stage vortex vibration; in order to realize lower vibration frequency, a fiber reinforced nylon material with rigidity and density far lower than that of steel is selected, so that the engineering cost can be greatly reduced; the spring material can be subjected to hole opening and grooving treatment, so that the rigidity of the spring is further reduced, the length of the spring is shortened, and the engineering cost is reduced; the material and the form of the mass body of the vibration control system are not limited, steel plates, steel blocks, concrete blocks, water bags and the like can be adopted, the disassembly and the parameter adjustment are convenient, and the cost can be reduced by one order of magnitude or even two orders of magnitude compared with the traditional tuned mass damper with the same tonnage; the two pulleys which are coaxial and have different diameters are adopted, so that the vibration of the mass body can be amplified, the weight of the mass body can be obviously reduced under the condition that the control efficiency is unchanged, or the control efficiency is obviously improved under the condition that the weight of the mass body is unchanged, the cost is further reduced, the advantages and the competitiveness of the pulley are further improved, and the pulley is especially obvious in the case of higher frequency; the vibration control device is small in size, is arranged at the bottom of the beam, can be temporarily retracted when not in work, and basically does not affect the appearance of the bridge; the mass body vibration control is convenient, the damping parameters are adjustable, the ultra-damping can be realized under the condition that the mass body reaches the specified large amplitude through the human intervention, and the control efficiency is improved; the system is not limited to controlling bridge vortex vibration, and can also inhibit certain bridge flutter, and the energy consumption capability of the system can be improved only by adjusting the rigidity, the mass and the damping parameters of the system, so that the system can be used for flutter control.
The technical scheme of the invention is as follows:
a semi-active vibration absorption and energy dissipation control system for restraining vortex-induced vibration of a bridge comprises a spring end plate 1, a linear extension spring 2, a vertical lifting rope 3, a sliding block 4, a sliding way 5, a first high-strength rope 6, a first pulley 7, a second pulley 8, a second high-strength rope 9, a mass body 10, a pulley fixing device 11, an energy dissipation device 12, an electric control jack 13 and a controller 14, wherein the spring end plate is fixed on a main beam bottom plate; the spring end plate 1 is fixedly connected with the bottom plate of the main beam and is used for fixing one or a plurality of linear extension springs 2 which are horizontally arranged and connected in series or in parallel; for controlling the low-frequency vortex vibration, the original length and the stretching length of the linear tension spring 2 are generally longer, and reach several meters or even dozens of meters, so that large deflection can be generated under the action of self weight, and at the moment, vertical lifting points are provided for the linear tension spring 2 at intervals by a plurality of vertical lifting ropes 3; the upper end of the vertical lifting rope 3 is connected with the sliding block 4; the slide block 4 is embedded in a slide way 5 fixed on the bottom plate of the main beam; in the process that the linear extension spring 2 extends and retracts in the horizontal direction, the vertical lifting rope 3 and the sliding block 4 slide in the slideway 5, and basically no horizontal force is provided; the slide way 5 can be continuous or segmented, and the sliding stroke of the slide block 4 can be met; one end of a first high-strength rope 6 is connected with the tail end of the linear extension spring 2, the other end of the first high-strength rope is fixed and wound on a first pulley 7, the winding length is enough, and the requirement of the linear extension spring 2 on extension and retraction is met; the first pulley 7 is fixed coaxially with a second pulley 8 of larger diameter; the upper end of a second high-strength rope 9 is fixed and wound on the second pulley 8, the winding length is enough, and the lower end of the second high-strength rope 9 is connected with a mass body 10; the first pulley 7 and the second pulley 8 are supported below the main beam by a fixing device 11; by designing parameters such as the rigidity of the linear tension spring 2, the diameters of the first pulley 7 and the second pulley 8, the mass of the mass body 10 and the like, the vibration frequency of the vibration control system is basically consistent with the controlled vortex vibration frequency of the bridge, and when the bridge generates vertical or torsional vortex vibration, the mass body 10 can generate large-amplitude resonance to absorb the vibration energy of the bridge and play a role in inhibiting the vibration of the bridge; if the damping of the vibration control system is low, the energy consumption is low, and the mechanical energy (kinetic energy and potential energy) of the mass body 10 which vibrates greatly needs to be consumed, and the energy dissipater 12 is adopted to achieve the aim; the energy dissipater 12 is connected with the electric control jack 13 and is controlled by the electric control jack to move and be in a state; the controller 14 is used for controlling the electric control jack 13 to drive the energy dissipater 12 to clamp the second pulley 8 when the speed of the mass body 10 is basically close to zero, then the second pulley 8 is loosened, kinetic energy and potential energy of the mass body 10 are consumed rapidly by friction, friction energy dissipation can be generated between the energy dissipater 12 and the second pulley 8 all the time in the vibration process of the mass body 10, friction energy dissipation can also be performed in an automobile hub braking mode, the specific mode is not limited, and related parameters can be determined through optimization design, so that the optimal control effect is achieved.
The spring end plate 1 is made of a steel plate with stiffening ribs, so that sufficient rigidity and strength are ensured, the spring end plate can be welded at a proper position of a main beam bottom plate, and can be fixed on a bridge pier (tower or platform) when the span of a bridge is small or high-order modal vibration needs to be controlled, and the parameters are related to the original length, the stretching length, the position of the pulley fixing device 11 and the like of the linear tension spring 2;
the linear tension spring 2 has good linear elasticity and limit tension length, the model, the rigidity and the length of the linear tension spring are related to parameters such as bridge vortex vibration frequency, the diameter ratio of the first pulley 7 and the second pulley 8, the mass of the mass body 10 and the like, the mass of the linear tension spring is as small as possible, and not only can the material cost and the construction cost be reduced, but also the sag effect of the linear tension spring can be reduced; the linear extension spring 2 can be one through long, can be connected in series in a segmented mode, and does not necessarily adopt the same specification; the springs with different lengths connected in series can realize different tensile stiffness, so that the vibration frequency is adjusted; a plurality of springs can be connected in parallel according to the strength and rigidity requirements;
the linear tension spring 2 is not limited to metal springs such as steel, aluminum alloy, titanium alloy and the like, and for the low-frequency vibration control situation, the spring needs to be very long, at the moment, the metal spring may not have applicability, and fiber reinforced nylon materials with lower rigidity and density and the like need to be adopted, and the materials need to meet the characteristics of high strength, low elastic modulus, good linear elasticity, low density, low unit price and the like;
the linear extension spring 2 is not limited to a round solid section, and can also adopt a proper form of opening a hole and slotting as required to further reduce the extension stiffness of the linear extension spring, so that the original length of the linear extension spring is shortened to achieve the aim of reducing the construction cost;
the vertical spring lifting rope 3 is light, high in strength, small in stretching deformation and generally provided with a plurality of lifting ropes, is arranged at different positions of the linear extension spring 2, and mainly aims to reduce the sag effect of the linear extension spring 2 so as to reduce the nonlinear effect and ensure the vibration control efficiency;
the sliding block 4 slides freely in the slideway 5, and the friction coefficient is as small as possible;
in order to reduce or eliminate the sag effect and the nonlinear effect of the linear extension spring 2, the vertical lifting rope 3, the sliding block 4 and the slideway 5 are not necessarily adopted, and various modes can be provided, such as that the linear extension spring 2 is arranged in a horizontally arranged pipeline, a groove or even a flat plate, or is sleeved on a horizontally arranged pipe rod, and the like, and the defects that mutual friction exists, the performance of the spring is influenced, and some parameters are not convenient to accurately control;
the first pulley 7 and the second pulley 8 have enough strength and rigidity, the diameter ratio is not limited, and the pulleys can be designed and selected according to requirements; for low frequency vibration (e.g. lower than 0.15Hz), the second pulley 8 is not needed, and for higher vibration frequency, the diameter ratio of the second pulley 8 to the first pulley 7 is larger, so that the overall performance is better;
the first high-strength rope 6 and the second high-strength rope 9 are sufficient in length, strength and rigidity, and small in diameter as much as possible, so that a part of the first high-strength rope and a part of the second high-strength rope are respectively wound on the first pulley 7 and the second pulley 8 in the vibration process;
the shape and material of the mass body 10 are not limited, and steel plates, steel blocks, lead blocks, concrete blocks or water bags can be adopted, and the water bags are recommended in the invention for the following reasons: the disassembly and assembly are convenient, the cost is low, the self weight is convenient to adjust (a water inlet and a water outlet are respectively arranged at the upper part and the bottom part), and the danger coefficient is low; under the non-working state, the water is discharged, and the water bag is folded, so that the appearance of the bridge is basically not influenced;
the energy dissipation device 12 is made of a material with a large friction coefficient and good wear resistance, and when the mass body 10 vibrates up and down and the second pulley 8 rotates, the energy dissipation device 12 can also be in contact with the mass body to consume energy through friction; it is also possible to clamp the pulley 8 with the dissipator 12 only when the mass 10 reaches a given amplitude (preferably at a speed close to 0) and then slowly relax, dissipating the kinetic and potential energy of the vibrating system by friction between them;
the electric control jack 13 has enough power and output precision;
the controller 14 has higher control precision;
the semi-active vibration absorption and energy dissipation control system can rapidly absorb vibration through the mass body 10, and timely consume mechanical energy of the mass body 10 through the energy dissipation device 12, so that the energy dissipation device enters the next vibration cycle to rapidly absorb mechanical energy of a bridge, and inhibit bridge vibration.
For the control of the torsional vortex vibration of the bridge, the device can be arranged on the upstream side and the downstream side of the main beam of the bridge, the horizontal linear tension spring 2 can also be arranged along the transverse direction of the main beam, and the transverse width of the bridge can generally meet the requirement due to the fact that the torsional vibration frequency is relatively high (>0.2 Hz).
If the mass 10 is large enough and the diameter of the second pulley 8 to the first pulley 7 is large enough, the vibration absorbing capacity of the mass 10 will be large enough, and eventually it will also provide a strong enough energy consuming capacity to control the bridge flutter.
On one hand, the weight of a single set of mass body 10 can be reduced, and the specification of the linear extension spring 2 is correspondingly adjusted; on the other hand, the horizontal tension of the single spring end plate 1 can be reduced; the horizontal force of the pulley fixing device 11 can be offset, and the local stress of the main beam is improved.
For the high-frequency (such as >0.25Hz) vibration control working condition, the tensile length and the original length of the spring can be basically controlled within 10m, two sets of devices can be manufactured in a bilateral symmetry mode, the two sets of devices are symmetrically installed in a frame capable of bearing enough horizontal pressure, and the frame is fixed at the bottom of the main beam, so that the main beam only bears vertical load and does not have horizontal load, and the structure is more favorably stressed and is easy to accept.
The invention has the beneficial effects that: (1) the springs are horizontally arranged instead of being vertical, so that the springs are not limited by the internal space of the main beam, can be suitable for any frequency and have wider application range; (2) the spring can be divided into a plurality of sections, so that the vibration frequency of the system can be adjusted in a large range; (3) the spring is not limited to a traditional metal spring, and is made of a fiber reinforced nylon material and is matched with appropriate treatments such as hole opening and slotting, so that the quality and cost of the spring under the low-frequency vibration working condition can be greatly reduced; (4) the material and the form of the mass body are not limited, a water bag can be adopted, the cost is low, and the disassembly, assembly and adjustment are convenient; (5) the pulleys with the same shaft and different diameters are adopted, so that the weight of the mass body can be obviously reduced under the condition that the control efficiency is unchanged, or the control efficiency can be obviously improved under the condition that the weight of the mass body is unchanged, and the economy is better under the high-frequency condition; (6) the device is small in size, is arranged at the bottom of the beam, does not affect the appearance basically, can be made into two sets or even more sets, improves the stress and reduces the manufacturing cost; (7) the vibration of the mass body is convenient to control, the mechanical energy of the mass body is quickly consumed through human intervention, and the control efficiency of the bridge vibration is improved; (8) the method can control the bridge vortex vibration (vertical bending and torsion) and can also inhibit certain bridge flutter.
Drawings
Fig. 1 is a structural diagram of a semi-active vibration absorption and energy dissipation control system for suppressing vortex-induced vibration of a large-span bridge.
Fig. 2 is an enlarged view of a portion of the pulley energy dissipation device of fig. 1.
In the figure: the device comprises a spring end plate 1, a linear extension spring 2, a vertical lifting rope 3, a sliding block 4, a slideway 5, a first high-strength rope 6, a first pulley 7, a second pulley 8, a second high-strength rope 9, a mass body 10, a pulley fixing device 11, an energy dissipation device 12, an electric control jack 13 and a controller 14.
Detailed Description
The following detailed description of the embodiments of the present invention is provided in conjunction with the drawings and the technical solutions, but the embodiments of the present invention are not limited thereto:
as shown in fig. 1, a semi-active vibration absorption and energy dissipation control system for suppressing vortex-induced vibration of a long-span bridge comprises a spring end plate 1 fixed on a main beam bottom plate, a linear extension spring 2, a vertical lifting rope 3, a sliding block 4, a slideway 5, a first high-strength rope 6, a first pulley 7, a second pulley 8, a second high-strength rope 9, a mass body 10, a pulley fixing device 11, an energy dissipation device 12, an electric control jack 13 and a controller 14; the spring end plate 1 is usually arranged at the bottom of a main beam or on a pier (tower or platform), can be made of a stiffening rib steel plate and is used for fixing one or a plurality of linear extension springs 2 which are horizontally arranged and are connected in series or in parallel; the original length and the stretching length of the linear extension spring 2 are generally longer, vertical lifting points are provided at intervals by a plurality of vertical lifting ropes 3, and the nonlinear effect caused by sag is reduced; the upper end of the vertical lifting rope 3 is connected with the sliding block 4; the slide block 4 is embedded in a slide way 5 fixed on the bottom plate of the main beam; one end of a first high-strength rope 6 is connected with the tail end of the linear extension spring 2, the other end of the first high-strength rope is fixed and wound on a first pulley 7, the winding length is enough, and the requirement of the linear extension spring 2 on extension and retraction is met; the first pulley 7 is fixed coaxially with a second pulley 8 of larger diameter; the upper end of a second high-strength rope 9 is fixed and wound on the second pulley 8, the winding length is enough, and the lower end of the second high-strength rope 9 is connected with a mass body 10; the first pulley 7 and the second pulley 8 are supported below the main beam by a fixing device 11; the energy dissipater 12 is connected with the electric control jack 13 and is controlled by the electric control jack to move and be in a state; the controller 14 is used for controlling the electric control jack 13 to drive the energy dissipater 12, clamping the second pulley 8 when the speed of the mass body 11 is basically close to zero, then loosening, quickly consuming kinetic energy and potential energy of the mass body 11 by means of friction, and generating friction energy dissipation between the energy dissipater 12 and the second pulley 8 in the vibration process of the mass body 10; according to the vibration frequency of the bridge, parameters such as the rigidity of the linear tension spring 2, the mass of the mass body 10, the diameter ratio of the first pulley 7 to the second pulley 8 and the like are set, so that the vibration frequency of the control system is close to the vibration frequency of the bridge, the vibration energy of the bridge is transferred to the semi-active vibration absorption and energy dissipation control system by using the resonance energy absorption principle, and the total energy of the semi-active vibration absorption and energy dissipation control system is dissipated by using the friction between the energy dissipation device 12 and the second pulley 8, so that the vibration of the bridge is restrained. If two sets of devices are symmetrically arranged left and right, the weight of a single set of mass body 10 can be reduced, and the specification of the linear extension spring 2 is correspondingly adjusted; the horizontal tension of the single spring end plate 1 can also be reduced; the horizontal force of the pulley fixing device 11 can be offset, and the local stress of the main beam is improved. For the high-frequency working condition, when the extension length of the spring is shorter, two sets of devices can be manufactured in a bilateral symmetry mode and are symmetrically installed in a frame fixed at the bottom of the main beam, and therefore structural stress is improved.
The semi-active vibration absorption and energy dissipation control system for restraining the bridge vortex vibration can conveniently adjust system parameters to meet the control requirement of multi-stage vertical bending vortex-induced vibration, can control the bridge torsional vortex vibration and can restrain certain bridge vibration, improve the critical vibration wind speed and reduce the amplitude, can be applied to vortex vibration, vibration and galloping control of other structures by properly modifying the device, and is wide in application range, convenient, rapid, safe and practical.
The foregoing is merely exemplary of the preferred embodiments of the present invention and is not intended to limit the invention in any manner. Any equivalent alterations, modifications or improvements, etc. made to the above examples by those skilled in the art using the teachings of the present invention, are still within the scope of the present invention.
Claims (10)
1. A semi-active vibration absorption and energy dissipation control system for restraining vortex-induced vibration of a bridge is characterized by comprising spring end plates (1) fixed on a bottom plate of a main beam, linear extension springs (2), vertical lifting ropes (3), a sliding block (4), a sliding way (5), a first high-strength rope (6), a first pulley (7), a second pulley (8), a second high-strength rope (9), a mass body (10), a pulley fixing device (11), an energy dissipation device (12), an electric control jack (13) and a controller (14); the spring end plate (1) is fixed on the main beam bottom plate and used for fixing the starting end of the linear extension spring (2) which is horizontally arranged; the upper end of the vertical lifting rope (3) is connected with the sliding block (4), and the vertical lifting rope and the sliding block are arranged at intervals to provide vertical lifting points for the linear extension spring (2); the sliding block (4) is embedded in a slide way (5) fixed on the bottom plate of the main beam; one end of a first high-strength rope (6) is connected with the tail end of the linear extension spring (2), and the other end of the first high-strength rope is fixed and wound on a first pulley (7); the first pulley (7) and the second pulley (8) are coaxially fixed, and the diameter of the second pulley (8) is larger than that of the first pulley (7); the upper end of a second high-strength rope (9) is fixed and wound on the second pulley (8), and the lower end of the second high-strength rope is connected with a mass body (10); the first pulley (7) and the second pulley (8) are supported below the main beam bottom plate by a pulley fixing device (11); the energy dissipater (12) is connected with the electric control jack (13), and the electric control jack (13) is fixed below the main beam bottom plate; the controller (14) is used for controlling the electric control jack (13) to further drive the energy dissipater (12); the mass of the linear tension spring (2), the rigidity of the linear tension spring (2), the mass of the mass body (10) and the diameter ratio of the first pulley (7) to the second pulley (8) are adjusted to enable the vibration frequency of the semi-active vibration absorption and energy dissipation control system to be close to the vibration frequency of the bridge, the vibration energy of the bridge is transferred to the semi-active vibration absorption and energy dissipation control system by utilizing the resonance energy absorption principle, and the total energy of the semi-active vibration absorption and energy dissipation control system is dissipated by utilizing the friction between the energy dissipation device (12) and the second pulley (8), so that the vibration of the bridge is restrained.
2. The semi-active vibration absorption and energy dissipation control system for restraining the vortex-induced vibration of the bridge according to claim 1, wherein the vertical lifting ropes (3), the sliding blocks (4) and the sliding ways (5) are adopted to reduce or eliminate the sag effect and the nonlinear effect of the linear tension springs (2), and the linear tension springs (2) are replaced by being placed in a horizontally placed pipeline, a groove, a flat plate or sleeved on a horizontally placed pipe rod.
3. The semi-active vibration absorption and energy dissipation control system for restraining the vortex-induced vibration of the bridge according to claim 1 or 2, wherein the linear tension spring (2) is horizontally arranged on a bottom plate of the main beam, and has no limit on the length and the inner space of the main beam; the linear tension spring (2) is made of fiber reinforced nylon materials and is subjected to hole opening or grooving treatment, so that the material consumption can be reduced.
4. The semi-active vibration absorption and energy dissipation control system for suppressing the vortex-induced vibration of the bridge according to claim 1 or 2, wherein 2 sets of semi-active vibration absorption and energy dissipation control systems are symmetrically arranged, so that the weight of a single set of semi-active vibration absorption and energy dissipation control system can be reduced, the horizontal force of the spring end plate (1) and the pulley fixing device (11) is eliminated, and the stress of the bridge is improved.
5. The system according to claim 3, wherein 2 sets of the semi-active vibration absorption and energy dissipation control systems are symmetrically arranged, so that the weight of a single set of the semi-active vibration absorption and energy dissipation control system can be reduced, the horizontal force of the spring end plate (1) and the pulley fixing device (11) can be eliminated, and the stress of the bridge can be improved.
6. The semi-active vibration absorption and dissipation control system for suppressing bridge vortex-induced vibration according to claim 1, 2 or 5, wherein the linear tension springs (2) are one-piece long, and are arranged in series or in parallel in sections.
7. The semi-active vibration absorption and dissipation control system for suppressing bridge vortex-induced vibration of claim 3, wherein the linear tension springs (2) are one-piece long, and are arranged in series or in parallel in sections.
8. The semi-active vibration absorption and dissipation control system for suppressing bridge vortex-induced vibration of claim 4, wherein the linear tension springs (2) are one-piece long, and are arranged in series or in parallel in sections.
9. The system for controlling energy dissipation through semi-active vibration absorption according to claim 1, 2, 5, 7 or 8, wherein the mass (10) is a steel plate, a steel block, a lead block, a concrete block or a water bag.
10. The system for controlling energy dissipation through semi-active vibration absorption for suppressing bridge vortex-induced vibration as claimed in claim 6, wherein the mass body (10) is a steel plate, a steel block, a lead block, a concrete block or a water bag.
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| CN113789879B (en) * | 2021-09-07 | 2022-09-16 | 湖南省潇振工程科技有限公司 | Pulley type tuned mass eddy current damper |
| CN115110405A (en) * | 2022-07-29 | 2022-09-27 | 大连理工大学 | Tuned mass inertial capacity damper for inhibiting low-frequency vortex-induced vibration of long-span bridge |
| CN118407325B (en) * | 2024-06-27 | 2024-10-18 | 中南大学 | Ultra-low frequency vortex-vibration control vibration damping device and method for large-span bridge girder |
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