CN214531244U - Multilayer unidirectional tuning liquid column damper - Google Patents
Multilayer unidirectional tuning liquid column damper Download PDFInfo
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- CN214531244U CN214531244U CN202120088933.6U CN202120088933U CN214531244U CN 214531244 U CN214531244 U CN 214531244U CN 202120088933 U CN202120088933 U CN 202120088933U CN 214531244 U CN214531244 U CN 214531244U
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Abstract
The utility model relates to a multilayer one-way tuning liquid column damper, which is a U-shaped box body as a whole, and the box body is formed by enclosing a plurality of U-shaped plates which are stacked from inside to outside but are not contacted and U-shaped end plates positioned at both sides of all the U-shaped plates; the horizontal section of each U-shaped plate is provided with a baffle plate, two adjacent U-shaped plates and two U-shaped end plates on two sides form a U-shaped cavity respectively, liquid is filled in each U-shaped cavity to form a liquid column, and the U-shaped cavities are independent from each other; the top of each U-shaped cavity is open and is positioned on the same horizontal plane. The utility model discloses on the basis of current one-way harmonious liquid column damper, through the mode of range upon range of setting up the U template, realized the promotion of damping effect, can enlarge harmonious frequency bandwidth and control the multistage mode of vibration of structure simultaneously, also can increase the quality of liquid in the attenuator in order to improve the control efficiency of certain order mode of vibration; the self-oscillation frequency of the unidirectional tuning liquid column damper is easy to adjust, and the unidirectional tuning liquid column damper is convenient to install and maintain.
Description
Technical Field
The utility model belongs to the technical field of civil structure vibration control device, in particular to one-way harmonious liquid column damper of multilayer.
Background
Tuned Liquid Column Dampers (TLCD), proposed by Sakai in 1989, are economical, simple structural vibration control devices that have received extensive attention and research in the field of structural control. The TLCD is usually a U-shaped rectangular tank filled with liquid, the frequency of the TLCD is made to approach the frequency of the building structure by adjusting the length of the liquid (the liquid frequency of the TLCD depends on the total length of the liquid in the horizontal and vertical sections, and the natural frequency of vibration of the TLCD is generally adjusted by adjusting the length of the vertical section of liquid), and energy dissipation is achieved by liquid head loss due to liquid movement and viscous effects in the boundary layer when vibrating. TLCD has control efficiency height, installation convenient, the low characteristics of maintenance cost, and wherein the liquid that is used for the power consumption can also be used as building structure's fire prevention water and domestic water simultaneously, has very high practicality. A large number of experiments, numerical simulations and engineering practices prove that the TLCD has a wide application prospect in the aspect of structural vibration control, can be suitable for reducing structural vibration induced by wind load, earthquake load, wave load, ice load and the like, and has good control performance on common bridge structures, high-rise reinforced concrete structures, high-rise steel structures, wind generating sets and the like.
At present, the liquid of a common single layer TLCD corresponds to only one natural frequency of vibration. TLCD has good control when the natural frequency of the building structure being controlled and the natural frequency of the TLCD are close to each other. However, when the self-oscillation frequency of the TLCD deviates from the self-oscillation frequency of the structure by a relatively large amount, the control performance cannot be guaranteed. The deviation of the frequency of the TLCD from the natural frequency of vibration of the building structure may be due to: (1) the designed natural frequency of the structure may change during long-term structure use; (2) the structure is damaged under the earthquake condition, and the natural vibration frequency changes suddenly. While the natural frequency of TLCD depends only on the depth of the liquid within it. When the structure frequency changes due to external conditions and the TLCD frequency is not changed, the TLCD frequency deviates from the structure natural frequency, resulting in a decrease in control performance. Thus, the control performance of a single layer TLCD is very frequency sensitive.
SUMMERY OF THE UTILITY MODEL
Can only tune to the limitation of a certain specific frequency for overcoming current one-way harmonious liquid column damper (TLCD), increase the quality of liquid in the attenuator in order to improve control efficiency simultaneously under the prerequisite that does not occupy extra space, an object of the utility model is to provide a one-way harmonious liquid column damper of multilayer, on the basis of traditional harmonious liquid column damper (TLCD), through the setting of a plurality of range upon range of U type pipes of placing and corresponding baffle, realize on the harmonious frequency band of broad high-efficiently to the effect of structure damping power consumption, can improve control stability, the multistage type of shaking of simultaneous control structure.
The utility model provides a technical scheme that its technical problem adopted is:
the utility model provides a multilayer one-way tuned liquid column damper, which is characterized in that the multilayer one-way tuned liquid column damper is a U-shaped box body, and the box body is formed by enclosing a plurality of U-shaped plates which are stacked from inside to outside but not contacted and U-shaped end plates positioned at both sides of all the U-shaped plates; the horizontal section of each U-shaped plate is provided with a baffle plate, two adjacent U-shaped plates and two U-shaped end plates on two sides form a U-shaped cavity respectively, liquid is filled in each U-shaped cavity to form a liquid column, and the U-shaped cavities are independent from each other; the top of each U-shaped cavity is open and is positioned on the same horizontal plane.
Further, the mass of the multilayer one-way tuning liquid column damper is 1% -20% of the mass of the controlled structure.
Further, the distance between every two adjacent U-shaped plates is set to be the same or different, and the wall thickness of the horizontal section and the wall thickness of the vertical section of each U-shaped plate are 1-10% of the length of the horizontal section of the outermost U-shaped plate.
Further, the number of U-shaped plates is 3-7.
Furthermore, the area of each baffle is 0-95% of the cross section area of the horizontal section of the corresponding U-shaped plate; the thickness of each baffle plate is 50-150% of the wall thickness of the corresponding U-shaped plate.
The utility model discloses a characteristics and beneficial effect:
1. the utility model utilizes the geometrical characteristics of the U-shaped plates, and the U-shaped plates with smaller geometrical size are partially stacked between the vertical sections and the bottom horizontal sections at the two sides of each U-shaped plate, so that the quality of the liquid in the damper is increased on the premise of not occupying extra space to improve the control efficiency; when the structure moves in the vibration control direction of the damper, the liquid movement in the damper generates a damping effect, and the tuned vibration reduction of the building structure in the direction is realized.
2. The utility model discloses can be applied to following 2 kinds of scenes: (1) the liquid in the U-shaped cavities corresponds to a certain specific natural vibration frequency, the U-shaped geometric shape of the TLCD is fully utilized, the mass of the liquid in the damper is increased under the condition of a certain damper floor area, and the control efficiency of the damper on a certain vibration mode is improved; (2) the liquid in the U-shaped cavities respectively corresponds to a plurality of different self-vibration frequencies, so that the tuning frequency band of the damper is greatly widened, the control of the damper is more stable, and the multi-order vibration mode has the application prospect of simultaneously controlling the structure.
3. The utility model discloses the area of the internal baffle of well different U die cavities can set the diverse to the liquid damping ratio diverse that realizes different U type pipes, thereby improves the holistic robustness of device.
4. The utility model provides a liquid among the one-way harmonious liquid column damper of multilayer corresponds a plurality of different natural frequency of shaking or a certain specific natural frequency of shaking, and these natural frequency of shaking can change through changing the depth of water in corresponding region, and is convenient easy going.
5. The installation of the multilayer one-way tuning liquid column damper on the top of the structure is a feasible, simple and effective method for reducing the dynamic excitation vibration effect.
Drawings
Fig. 1 is a schematic structural diagram of a multi-layer unidirectional tuned liquid column damper (the number of U-shaped plates is 4) according to an embodiment of the present invention.
FIG. 2 is a top view of the multi-layer unidirectional tuned fluid column damper of FIG. 1.
Fig. 3 is a sectional view taken along the line a-a of the multi-layer unidirectional tuned fluid column damper of fig. 2.
Reference numbers in the figures:
1-a U-shaped plate; 2, a baffle plate; 3-a liquid; 4-U-shaped end plate.
Detailed Description
The present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to the following embodiments.
As shown in fig. 1-3, the utility model provides a one-way harmonious liquid column damper of multilayer wholly appears as the box of U type in the outward appearance, this U type box is enclosed by a plurality of U template 1 that from inside to outside stack up but not contact and the U type end plate 4 that is located all U template both sides and closes to form, the horizontal section department of each U template 1 is equipped with baffle 2 respectively, each two adjacent U templates 1 and both sides U type end plate 4 form a U type cavity respectively, each U type cavity is internal to be filled with liquid 3 respectively and forms the liquid column, each U type cavity is independent each other between the body, in order to avoid the flow of liquid 3 between different U type cavity bodies; the tops of the U-shaped cavities are open and are positioned on the same horizontal plane; the horizontal section of the outermost layer U-shaped plate 1 is the lowest in position and the longest in length, and the vertical sections on the two sides of the outermost layer U-shaped plate 1 are the longest in length; the horizontal section of the innermost U-shaped pipe 1 is highest in position and shortest in length, and the vertical sections on the two sides of the innermost U-shaped pipe are shortest in length; the horizontal section of each U-shaped pipe 1 is provided with a baffle 2, and each baffle 2 is fixedly connected to the wall surface of the U-shaped pipe 1 which is in contact with the baffle 2; further, the area of each baffle 2 can be set according to a specific application scene. Each U-tube 1 is filled with a specific mass of liquid 3 to form a liquid column of a specific height.
The embodiment of the present invention provides a concrete implementation and functional description of each component part as follows:
in the damper of the embodiment, the U-shaped plate 1, the baffle plate 2 and the U-shaped end plate 4 can be made of steel, glass or plastic. The details of the design of each component are as follows: the distance between every two adjacent U-shaped plates 1 can be set to be the same or different, the wall thickness of the horizontal section and the vertical section of each U-shaped plate 1 is 1-10% of the length of the horizontal section of the outermost U-shaped plate 1, so that the U-shaped plates 1 have enough rigidity to bear static water or hydrodynamic pressure from liquid 3, the tops of the U-shaped plates 1 are open and located on the same horizontal plane, the number of the U-shaped plates 1 is preferably 3-7, so that the internal space of the outermost U-shaped plate is fully utilized, the total mass of the liquid is reasonably controlled, and excessive extra weight is prevented from being added to a controlled building structure; the thickness of each baffle plate 2 is 50-150% of the wall thickness of the corresponding U-shaped plate 1, so that the baffle plates 2 have enough rigidity; the water head loss coefficient of the TLCD device is changed by arranging the baffles 2, the baffles with different areas correspond to different water head loss coefficients, the area of each baffle 2 is 0% -95% of the cross section area of the horizontal section of the corresponding U-shaped plate 1 so as to ensure that the damper has a proper water head loss coefficient, and each baffle 2 can be arranged at any position of the horizontal section of the corresponding U-shaped plate 1. In the embodiment, 3 laminated U-shaped pipes 1 form a unidirectional multilayer tuned liquid column damper, and each baffle 2 is arranged at the midpoint of the horizontal section of the corresponding U-shaped plate 1; the mass ratio of the damper to the controlled structure is 1% -20%, and the vibration control direction (controlled direction) is parallel to the horizontal section of each U-shaped plate 1.
For an N-layer building structure, a damper with (N +1) U-shaped plates 1 (N U-shaped cavities are contained in the damper) is placed at the top layer of the structure, and then the motion equation of liquid in the ith U-shaped cavity in the damper is expressed as follows:
in the formula, m1iMass of first equivalent liquid, m2iA second equivalent liquid mass;
horizontal acceleration of the nth layer (i.e., the top layer) of the controlled structure;
yiacceleration, speed and displacement of liquid in an ith U-shaped cavity in the damper are respectively measured; c. CfiDamping the liquid in the ith U-shaped cavity in the damper; k is a radical offiThe rigidity of the liquid in the ith U-shaped cavity body in the damper is set;
seismic oscillation acceleration is adopted; g is the acceleration of gravity; a. theHiAnd AViAre respectively the ith U-shaped cavity in the damperCross-sectional area of horizontal segment and vertical segment on one side, HiAnd ViRespectively the length of the liquid in the horizontal section and the single-side vertical section of the ith U-shaped cavity body in the damper, rhowiIs the density, eta, of the liquid in the ith U-shaped cavity in the damperiThe cross section area ratio of the vertical section and the horizontal section of the liquid in the ith U-shaped cavity in the damper is shown; deltaiThe coefficient of head loss in the ith U-shaped cavity body in the damper (the calculation formula is specifically shown in an empirical prediction formula of the coefficient of head loss in a handbook of hydro-acoustical resistance, an author Idelchik IE, a publisher CRCPres, 1994), psiiThe degree of closure of the baffle of the ith U-shaped cavity in the damper (namely the percentage of the area of the baffle in the cross section area of the horizontal section of the corresponding U-shaped plate 1), and the control performance of the damper can be improved by a proper head loss coefficient.
The equation of motion for the nth layer of the controlled structure can be expressed as:
in the formula, mf,totalIs the total mass of liquid in the damper; m issN，csN，ksNThe mass, damping and stiffness of the nth layer of the controlled structure,
xN-1respectively the horizontal velocity and displacement of the (N-1) th layer of the controlled structure.
(generally speaking, the above two equations of motion are solved in a discrete time domain by a Newmark-beta time domain stepwise integration method (see structural dynamics, Liu Jing Bo, Du Xiu Li Master eds., mechanical industry Press, 2005 years))
Liquid natural vibration circular frequency omega in ith U-shaped cavity bodyfi[rad/s]It can be quickly calculated by:
the damper has the following use process:
the multi-layer one-way tuning liquid column damper is arranged at the top of a controlled structure, and liquid 3 (pure water or viscous liquid such as oil and glycerol) is contained in each U-shaped cavity. When the controlled structure is excited by external vibration, the damper generates a damping effect through the movement of the internal liquid 3 and the liquid head loss caused by the viscous action in the boundary layer, and the tuned vibration reduction of the structure in the controlled direction (the direction parallel to the horizontal sections of the U-shaped plates) can be realized. In the working process of the damper, the liquid column height in the damper is adjusted, so that the natural vibration frequency of the liquid in the damper is close to the natural vibration frequency of a controlled structure. The liquid in each U-shaped cavity body corresponds to a natural vibration frequency, and the damper in the embodiment can adjust 3 different or same natural vibration frequencies of the liquid. Under the condition of 3 different liquid natural vibration frequencies, a wider tuning frequency band ensures that the damper can realize vibration control with higher robustness, and can also be applied to multi-order vibration modes of a simultaneous control structure; under the condition of 3 same liquid natural vibration frequencies, the vibration control can be efficiently realized on a certain order vibration mode of the structure in a controlled direction.
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention and is not actually limited thereto. Therefore, if the person skilled in the art receives the teaching of the present invention, the protection scope of the present invention shall not be limited to the embodiments and the embodiments similar to the above-mentioned technical solution without creative design.
Claims (7)
1. The multi-layer one-way tuning liquid column damper is characterized in that the multi-layer one-way tuning liquid column damper is a U-shaped box body integrally, and the box body is formed by enclosing a plurality of U-shaped plates (1) which are stacked from inside to outside and are not in contact with each other and U-shaped end plates (4) positioned on two sides of all the U-shaped plates; the horizontal section of each U-shaped plate (1) is respectively provided with a baffle (2), each two adjacent U-shaped plates (1) and the U-shaped end plates (4) on two sides respectively form a U-shaped cavity, liquid (3) is respectively filled in each U-shaped cavity to form a liquid column, and the U-shaped cavities are independent from each other; the top of each U-shaped cavity is open and is positioned on the same horizontal plane.
2. The multi-layer one-way tuned fluid column damper according to claim 1, wherein the mass of said multi-layer one-way tuned fluid column damper is 1-20% of the mass of the controlled structure.
3. The multi-layer one-way tuning liquid column damper as claimed in claim 1 or 2, wherein the distance between every two adjacent U-shaped plates (1) is set to be the same or different, and the wall thickness of the horizontal section and the vertical section of each U-shaped plate (1) is 1-10% of the horizontal section of the outermost U-shaped plate (1).
4. The multi-layer one-way tuning liquid column damper as claimed in claim 1 or 2, wherein the number of the U-shaped plates (1) is 3-7.
5. The multi-layer one-way tuning liquid column damper as claimed in claim 1 or 2, wherein the area of each baffle plate (2) is 0% -95% of the cross-sectional area of the horizontal section of the corresponding U-shaped plate (1); the thickness of each baffle (2) is 50-150% of the wall thickness of the corresponding U-shaped plate (1).
6. The multi-layer one-way tuning liquid column damper as claimed in claim 1 or 2, wherein the baffle (2) is arranged at any position of the horizontal section of the corresponding U-shaped plate (1).
7. The multi-layer one-way tuned fluid column damper according to claim 1 or 2, wherein the vibration control direction is a direction parallel to the horizontal section of each U-shaped plate (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120088933.6U CN214531244U (en) | 2021-01-13 | 2021-01-13 | Multilayer unidirectional tuning liquid column damper |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120088933.6U CN214531244U (en) | 2021-01-13 | 2021-01-13 | Multilayer unidirectional tuning liquid column damper |
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| Publication Number | Publication Date |
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| CN214531244U true CN214531244U (en) | 2021-10-29 |
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| CN202120088933.6U Active CN214531244U (en) | 2021-01-13 | 2021-01-13 | Multilayer unidirectional tuning liquid column damper |
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- 2021-01-13 CN CN202120088933.6U patent/CN214531244U/en active Active
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