CN112302188A - Multistage shock-insulation rubber-sliding system support and shock insulation effect calculation method thereof - Google Patents
Multistage shock-insulation rubber-sliding system support and shock insulation effect calculation method thereof Download PDFInfo
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- 230000035939 shock Effects 0.000 title claims abstract description 62
- 238000009413 insulation Methods 0.000 title claims abstract description 42
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- 238000002955 isolation Methods 0.000 claims description 18
- -1 polytetrafluoroethylene Polymers 0.000 claims description 16
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 16
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 16
- 229910001220 stainless steel Inorganic materials 0.000 claims description 15
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/36—Bearings or like supports allowing movement
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
- E04H9/022—Bearing, supporting or connecting constructions specially adapted for such buildings and comprising laminated structures of alternating elastomeric and rigid layers
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Abstract
The invention provides a multistage shock insulation rubber-sliding system support which comprises a laminated shock absorber (1), wherein the upper surface and the lower surface of the laminated shock absorber (1) are respectively connected with an upper sliding system (2) and a lower sliding system (3) in a sliding manner, and the dynamic friction coefficient mu of the upper sliding system (2) is1Less than the dynamic friction coefficient mu of the lower slip system (3)2. The invention also provides a method for calculating the shock insulation effect of the multistage shock insulation rubber-sliding system support. The invention realizes the multi-stage shock insulation function under the condition of unchanged plane area by arranging the laminated shock absorber and the upper and lower sliding systems: the shock insulation effect of the laminated shock absorber is mainly exerted in case of small shock; when the magnitude of the shock is increased, the vibration level is increased,the increase of the horizontal earthquake inertia force enables the upper sliding system to start working; when a rare earthquake occurs, the lower sliding system starts to work and simultaneously plays a role in protecting the laminated shock absorber, and the support system can greatly reduce the damage of earthquake motion to the upper structure when playing a role together.
Description
Technical Field
The invention relates to a multistage vibration isolation rubber-sliding system support and a vibration isolation effect calculation method thereof, and belongs to the technical field of building vibration isolation.
Background
The destruction and collapse of house buildings caused by earthquakes are the most main factors causing casualties, so the earthquake resistance of the buildings is an important subject in the fields of earthquake engineering, civil engineering and the like. The vibration isolation support plays an important role in building vibration resistance, and the basic principle is that a certain energy dissipation device is arranged between an upper structure and a lower foundation, and the purpose of reducing the vibration of the upper structure is achieved by dissipating the energy of seismic waves transmitted from the lower part. A large number of tests and earthquake damage surveys prove that the seismic isolation support can effectively reduce the damage of horizontal seismic inertia force to a building structure.
The existing shock insulation device mainly comprises a laminated rubber shock insulation support, a shock insulation elastic sliding plate support and a shock insulation rubber-sliding plate combined support. The shock insulation rubber-sliding plate combined support can effectively reduce the seismic energy transferred to an upper building structure by simultaneously playing the energy consumption effects of the flexible deformation of rubber and the plastic sliding of the sliding plate, and is more and more widely applied. However, the existing rubber-sliding plate combined support adopts a single friction pair, the allowed sliding displacement is small under the condition of limiting the plane size, different shock insulation effects on seismic loads with different strengths and characteristics cannot be realized, and meanwhile, the rubber body cannot be protected.
In addition, the conventional rubber-sliding plate combined support is difficult to obtain the dynamic friction coefficient and the limited displacement which can achieve the optimal shock insulation effect under the action of specific earthquake motion through calculation, so that the dynamic friction coefficient of a friction pair and the limited displacement when the friction pair slides cannot be scientifically selected, and the shock insulation effect of the rubber-sliding plate combined support cannot be scientifically evaluated.
Disclosure of Invention
The invention aims to solve the technical problem of providing a multistage vibration isolation rubber-sliding system support which can simultaneously realize the optimized vibration isolation effect of multistage earthquakes.
Meanwhile, the invention provides a method for calculating the shock insulation effect of the multistage shock insulation rubber-sliding system support, the method can calculate the shock insulation effect obtained by combining a certain dynamic friction coefficient and a limited displacement under a specific earthquake motion condition, and based on the calculation of different combinations, the dynamic friction coefficient and the limited displacement combination which can achieve the optimal shock insulation effect under the specific earthquake motion action can be obtained.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the multistage shock-insulation rubber-sliding system support comprises a laminated shock absorber, wherein the upper surface and the lower surface of the laminated shock absorber are respectively connected with an upper sliding system and a lower sliding system in a sliding manner, and the dynamic friction coefficient mu of the upper sliding system1Less than the dynamic friction coefficient mu of the lower slip system2。
The upper surface and the lower surface of the laminated shock absorber are fixedly connected with an upper connecting plate and a lower connecting plate respectively, the upper connecting plate is in sliding connection with the first middle sliding plate through a second sliding friction pair, the lower connecting plate is in sliding connection with the second middle sliding plate through a third sliding friction pair, the first middle sliding plate is in sliding connection with the top plate through the first sliding friction pair, and the second middle sliding plate is in sliding connection with the bottom plate through a fourth sliding friction pair; the inner side edges of the top plate, the first middle sliding plate, the second middle sliding plate and the bottom plate are provided with limiting rings, and the laminated shock absorber is coated with a rubber protective layer.
The length of the top plate is larger than the diameter of the first intermediate sliding plate, and the diameter of the first intermediate sliding plate is larger than that of the upper connecting plate.
The length of the bottom plate is larger than the diameter of the second intermediate sliding plate, and the diameter of the second intermediate sliding plate is larger than that of the lower connecting plate.
The first sliding friction pair, the second sliding friction pair, the third sliding friction pair and the fourth sliding friction pair all comprise polytetrafluoroethylene plates and stainless steel sliding plates.
The roof the slide in the middle of first middle the slide in the middle of the second with the medial surface of bottom plate has all welded the stainless steel slide, slide in the middle of first middle the upper junction plate the slide in the middle of the second with the lateral surface of lower connecting plate all is provided with the recess, the recess is embedded to have the polytetrafluoroethylene board, corresponding the polytetrafluoroethylene board with the stainless steel slide contacts.
The dynamic friction coefficients of the first sliding friction pair and the second sliding friction pair are smaller than those of the third sliding friction pair and the fourth sliding friction pair.
The laminated shock absorber includes a laminated rubber body composed of a plurality of rubber layers and a plurality of steel plates.
The roof is square, all be provided with the connecting hole on four angles of roof.
A method for calculating the shock insulation effect of a multistage shock insulation rubber-sliding system support comprises the following steps:
local vibration acceleration exceeding mu1When the first sliding friction pair and the second sliding friction pair start to slide, the relative sliding acceleration a1Calculated by the following formula:
a1＝ag-μ1g (1)
in the formula (1), agIs the input original seismic acceleration, g is the gravity acceleration, mu1Is the dynamic friction coefficient of the first sliding friction pair and the second sliding friction pair, a1Relative sliding acceleration of the first sliding friction pair and the second sliding friction pair is obtained;
relative sliding velocity v at arbitrary time t1(t) and relative sliding displacement d1(t) can be calculated by the following formula:
d1(t)＝L1 (3)
wherein v is1(t0) And d1(t0) Are each t0Relative sliding speed and relative sliding displacement of the first sliding friction pair and the second sliding friction pair at the moment; the limit displacement of the upper slip system and the lower slip system is respectively L1And L2To representAnd the judgment conditions for stopping sliding of the first sliding friction pair and the second sliding friction pair are as follows:
v1(t) 0 or d1(t)＝L1
When d is1(t)＝L1When the earthquake motion continues in the same direction, the local vibration acceleration exceeds mu2When the corresponding third sliding friction pair and the fourth sliding friction pair start to slide, the relative sliding acceleration a of the third sliding friction pair and the fourth sliding friction pair2Relative sliding velocity v2(t) and relative sliding displacement d2(t) can be calculated in the same manner as in the above formula; finally, the ultimate working conditions of the third sliding friction pair and the fourth sliding friction pair are as follows:
d1(t)＝L1，d2(t)＝L2
in the whole earthquake motion action process, earthquake motion acceleration a 'after energy dissipation and shock insulation is carried out through sliding of friction pairs of an upper sliding system and a lower sliding system'gCalculated by the following formula:
a'g＝ag-a1-a2 (4)。
through the steps, the shock insulation effect obtained by combining a certain dynamic friction coefficient and the limited displacement under the specific earthquake motion condition can be calculated. Based on the calculation of different combinations, the combination of the dynamic friction coefficient and the limited displacement which can achieve the optimal shock insulation effect under the action of specific earthquake motion can be obtained.
The invention has the beneficial effects that:
the invention provides a multistage vibration-isolating rubber-sliding system support, which is characterized in that an upper sliding system, a lower sliding system and a middle laminated shock absorber are designed to jointly form energy-consuming vibration-isolating elements, and the upper sliding system and the lower sliding system are respectively provided with two groups of sliding friction pairs formed by polytetrafluoroethylene plates and stainless steel sliding plates. Aiming at earthquakes of different grades, the laminated shock absorber mainly plays a shock absorption role in small earthquakes; when the local vibration strength is increased, the earthquake inertia force is increased to cause relative sliding between the polytetrafluoroethylene plate and the stainless steel sliding plate, and because the dynamic friction coefficient of the first sliding friction pair and the dynamic friction coefficient of the second sliding friction pair are both smaller than the dynamic friction coefficients of the third sliding friction pair and the fourth sliding friction pair, the upper sliding system firstly starts to work, and the support slides between the first sliding friction pair and the second sliding friction pair, so that the upper sliding system and the laminated shock absorber play an energy dissipation role together during the middle vibration; when the structure suffers from a large earthquake, due to the limitation of the limiting ring, after the first sliding friction pair and the second sliding friction pair reach the maximum displacement, the lower sliding system starts to work, namely the third sliding friction pair and the fourth sliding friction pair start to slide, at the moment, the whole rubber-sliding system cooperatively plays an energy dissipation role, and the laminated shock absorber is protected through the friction energy dissipation of the lower sliding system. When the support systems work together, the damage of earthquake motion to the upper structure is greatly reduced.
Meanwhile, the invention provides a method for calculating the shock insulation effect of the multistage shock insulation rubber-sliding system support, and the dynamic friction coefficients of the sliding friction pairs in the upper and lower sliding systems and the distribution of the limited displacement can be adjusted according to the actual needs and the characteristics of the designed earthquake motion, so that the energy consumption effects of different purposes are achieved, and the shock insulation effects of different earthquake intensity areas are optimized.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a sectional view taken along line A-A of FIG. 1;
FIG. 3 is a diagram of the shock insulation effect of two sets of friction pairs of an upper slipping system and a lower slipping system under different dynamic friction coefficient settings;
FIG. 4 is a diagram showing the seismic isolation effect of the present invention with only an upper sliding system and with both upper and lower sliding systems.
Detailed Description
The invention further describes a multistage vibration-isolating rubber-sliding system support and a calculation method of a friction coefficient thereof in detail by combining the attached drawings and specific embodiments.
As shown in figures 1-2, a multistage vibration isolation rubber-sliding system support comprises a laminated vibration absorber 1, a top plate 10, a bottom plate 12, a first intermediate sliding plate 6, a second intermediate sliding plate 8 and a rubber protective layer 16, wherein a limit ring 14 matched with the first intermediate sliding plate 6 is arranged at the edge of the bottom surface of the top plate 10, an upper connecting plate 4 is arranged on the upper surface of the laminated vibration absorber 1, a limit ring 14 matched with the upper connecting plate 4 is arranged at the edge of the bottom surface of the first intermediate sliding plate 6, a lower connecting plate 5 is arranged on the lower surface of the laminated vibration absorber 1, a limit ring 14 matched with the lower connecting plate 5 is arranged at the edge of the upper surface of the second intermediate sliding plate 8, a bottom plate 12 is arranged on the lower surface of the second intermediate sliding plate 8, a limit ring 14 matched with the second intermediate sliding plate 8 is arranged at the edge of the bottom plate 12, a first sliding friction pair 11 composed of a polytetrafluoroethylene plate and, a second sliding friction pair 7 consisting of a polytetrafluoroethylene plate and a stainless steel sliding plate is arranged between the first middle sliding plate 6 and the upper connecting plate 4, a third sliding friction pair 9 consisting of a polytetrafluoroethylene plate and a stainless steel sliding plate is arranged between the lower connecting plate 5 and the second middle sliding plate 8, and a fourth sliding friction pair 13 consisting of a polytetrafluoroethylene plate and a stainless steel sliding plate is arranged between the second middle sliding plate 8 and the bottom plate 12. The coefficient of dynamic friction of the upper slip system 2 (first and second sliding friction pairs) is smaller than that of the lower slip system 3 (third and fourth sliding friction pairs).
The length of the top plate 10 is greater than the diameter of the first intermediate sliding plate 6, and the diameter of the first intermediate sliding plate 6 is greater than the diameter of the upper connecting plate 4.
The length of the bottom plate 12 is greater than the diameter of the second intermediate sliding plate 8, and the diameter of the second intermediate sliding plate 8 is greater than the diameter of the lower connecting plate 5.
Roof 10 the slide 6 in the middle of the first slide 8 in the middle of the second with the medial surface of bottom plate 12 has all welded the stainless steel slide, slide 6 in the middle of the first upper junction plate 4 the slide 8 in the middle of the second with the lateral surface of lower junction plate 5 all is provided with the recess, the recess is embedded to have the polytetrafluoroethylene board, it is corresponding the polytetrafluoroethylene board with the stainless steel slide contacts.
The laminated shock absorber 1 includes a laminated rubber body composed of a plurality of rubber layers and a plurality of steel plates.
The top plate 10 is square, and four corners of the top plate 10 are provided with connecting holes 15.
The first intermediate sliding plate 6, the second intermediate sliding plate 8, the upper connecting plate 4 and the lower connecting plate 5 are all circular plates.
The retainer ring 14 is fixed by bolts.
The embodiment provides a multistage shock insulation rubber-sliding system support which mainly comprises an upper sliding system, a lower sliding system and a laminated rubber body, wherein the upper sliding system and the lower sliding system are respectively provided with two groups of sliding friction pairs consisting of polytetrafluoroethylene plates and stainless steel sliding plates. Aiming at earthquakes of different grades, the laminated rubber body mainly plays a role in damping in small earthquakes; when the local vibration strength is increased, the earthquake inertia force is increased to cause relative sliding between the polytetrafluoroethylene plate and the stainless steel sliding plate, because the dynamic friction coefficient of the first sliding friction pair 11 and the dynamic friction coefficient of the second sliding friction pair 7 are both smaller than the dynamic friction coefficients of the third sliding friction pair 9 and the fourth sliding friction pair 13, the upper sliding system 2 starts to work at first, and the support slides between the first sliding friction pair and the second sliding friction pair, therefore, the upper sliding system 2 and the laminated rubber body play an energy consumption role together during the middle earthquake; when the structure encounters a large earthquake, due to the limitation of the limiting ring 14, after the first sliding friction pair 11 and the second sliding friction pair 7 reach the maximum displacement, the lower sliding system 3 starts to work, namely the third sliding friction pair and the fourth sliding friction pair start to slide, at the moment, the whole rubber-sliding system cooperatively plays an energy consumption role, and the laminated rubber body in the middle is protected through the friction energy consumption of the lower sliding system 3. When the support systems work together, the damage of earthquake motion to the upper structure is greatly reduced.
In the case of a certain planar dimension of the seat, the dynamic friction coefficient and the allowable slip amount of each sliding friction pair in the present embodiment are not fixed. According to the actual needs and the characteristics of the designed earthquake motion, the dynamic friction coefficient of each sliding friction pair in the up-and-down sliding system can be adjusted and the distribution of displacement is limited, thereby achieving the energy consumption effects of different purposes. The size between the dynamic friction coefficients of the first sliding friction pair and the second sliding friction pair in the upper sliding system 2 does not need to be specified clearly, but different shock insulation effects can be achieved by setting different friction coefficients, and compared with a single friction pair, the shock insulation system has the advantages that the specific dynamic friction coefficients of the two sliding friction pairs can be given according to the specific structural design earthquake dynamic load time course, and the optimal shock insulation effect is achieved.
Next, the present embodiment provides a method for calculating the seismic isolation effect of a multistage seismic isolation rubber-slip system support, which is a method for selecting friction pairs with different dynamic friction coefficients according to the characteristics of seismic oscillation. For two different kinetic coefficients of friction mu1And mu2(μ1＜μ2)，
Local vibration acceleration exceeding mu1When the sliding force is applied, the first sliding friction pair 11 and the second sliding friction pair 7 start to slide, and the relative sliding acceleration a1Calculated by the following formula:
a1＝ag-μ1g (1)
in the formula (1), agIs the input original seismic acceleration, g is the gravity acceleration, mu1Is the dynamic friction coefficient of the first sliding friction pair and the second sliding friction pair, a1Relative sliding acceleration of the first sliding friction pair and the second sliding friction pair is obtained;
relative sliding velocity v at arbitrary time t1(t) and relative sliding displacement d1(t) can be calculated by the following formula:
d1(t)＝L1 (3)
wherein v is1(t0) And d1(t0) Are each t0Relative sliding speed and relative sliding displacement of the first sliding friction pair and the second sliding friction pair at the moment; the limiting displacement amounts of the upper sliding system 2 and the lower sliding system 3 are L1And L2If the first sliding friction pair and the second sliding friction pair stop sliding, the judgment conditions are as follows:
v1(t) 0 or d1(t)＝L1
When d is1(t)＝L1When the earthquake motion continues in the same direction, the local vibration acceleration exceeds mu2At the same time, the respective third sliding friction pair 9 and fourth sliding friction pair 13 start to slide, and their relative sliding acceleration a2Relative sliding velocity v2(t) and relative sliding displacement d2(t) can be calculated in the same manner as in the above formula; finally, the ultimate working conditions of the third sliding friction pair 9 and the fourth sliding friction pair 13 are as follows:
d1(t)＝L1，d2(t)＝L2
seismic dynamic acceleration a 'after energy dissipation and shock insulation through sliding of friction pairs of the upper sliding system 2 and the lower sliding system 3 in the whole seismic dynamic action process'gCalculated by the following formula:
a'g＝ag-a1-a2 (4)。
therefore, through the steps, the shock insulation effect obtained by combining a certain dynamic friction coefficient and the limited displacement under a specific earthquake motion condition can be calculated. Based on the calculation of different combinations, the combination of the dynamic friction coefficient and the limited displacement which can achieve the optimal shock insulation effect under the action of specific earthquake motion can be obtained. FIG. 3 shows two sets of friction pairs (μ)1And mu2) The shock insulation effect under different dynamic friction coefficient setting conditions is shown, wherein, the first condition is that two dynamic friction coefficients are both mu1As a result, in the case of two, the two friction coefficients are respectively μ1And mu2(μ1＜μ2) The result of (1). It can be seen that a smaller dynamic friction coefficient can trigger sliding when the earthquake intensity is smaller so as to achieve a more ideal seismic isolation effect, but due to the limitation of the allowable sliding displacement, the time for maintaining the ideal seismic isolation effect when the earthquake motion continues to increase is relatively shorter, so that a situation that a large earthquake motion cannot be isolated at some time (the result of the situation one in fig. 3) can occur; by the above steps, based on a certain valueAfter two optimal friction coefficient combinations are selected according to specific seismic motion characteristics, although the seismic isolation effect is not good in the former case when the seismic motion is small, the better seismic isolation effect can be achieved in the whole seismic process (the result of the case two in fig. 3).
The same is true for the third and fourth sliding friction pairs in the downslip regime.
As shown in fig. 4, in addition, after the sliding systems are arranged at the upper and lower parts of the laminated shock absorber 1, compared with the sliding system arranged only at the upper part, the shock insulation effect is greatly improved, and the plane size of the support does not need to be increased.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
As used herein, unless otherwise specified the use of the ordinal adjectives "first", "second", "third", etc., to describe a common object, merely indicate that different instances of like objects are being referred to, and are not intended to imply that the objects so described must be in a given sequence, either temporally, spatially, in ranking, or in any other manner.
While the invention has been described with respect to a limited number of embodiments, those skilled in the art, having benefit of this description, will appreciate that other embodiments can be devised which do not depart from the scope of the invention as described herein. Furthermore, it should be noted that the language used in the specification has been principally selected for readability and instructional purposes, and may not have been selected to delineate or circumscribe the inventive subject matter. Accordingly, many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the appended claims. The present invention has been disclosed in an illustrative rather than a restrictive sense, and the scope of the present invention is defined by the appended claims.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (10)
1. The multistage shock insulation rubber-sliding system support is characterized by comprising a laminated shock absorber (1), wherein the upper surface and the lower surface of the laminated shock absorber (1) are respectively connected with an upper sliding system (2) and a lower sliding system (3) in a sliding manner, and the dynamic friction coefficient mu of the upper sliding system (2) is1Less than the dynamic friction coefficient mu of the lower slip system (3)2。
2. The multistage vibration-isolating rubber-sliding system support seat is characterized in that an upper connecting plate (4) and a lower connecting plate (5) are fixedly connected to the upper surface and the lower surface of the laminated vibration absorber (1) respectively, the upper connecting plate (4) is in sliding connection with a first intermediate sliding plate (6) through a second sliding friction pair (7), the lower connecting plate (5) is in sliding connection with a second intermediate sliding plate (8) through a third sliding friction pair (9), the first intermediate sliding plate (6) is in sliding connection with a top plate (10) through a first sliding friction pair (11), and the second intermediate sliding plate (8) is in sliding connection with a bottom plate (12) through a fourth sliding friction pair (13); the inner side edges of the top plate (10), the first middle sliding plate (6), the second middle sliding plate (8) and the bottom plate (12) are provided with limiting rings (14), and a rubber protective layer (16) is coated outside the laminated shock absorber (1).
3. Multistage vibration-isolated rubber-slip system mount according to claim 2, wherein the length of the top plate (10) is greater than the diameter of the first intermediate sliding plate (6), and the diameter of the first intermediate sliding plate (6) is greater than the diameter of the upper connecting plate (4).
4. A multistage vibration-isolated rubber-slip system mount according to claim 2, wherein the length of said base plate (12) is greater than the diameter of said second intermediate sliding plate (8), and the diameter of said second intermediate sliding plate (8) is greater than the diameter of said lower connecting plate (5).
5. The multistage vibration-isolated rubber-sliding system support according to claim 2, wherein the first sliding friction pair (11), the second sliding friction pair (7), the third sliding friction pair (9) and the fourth sliding friction pair (13) comprise polytetrafluoroethylene plates and stainless steel sliding plates.
6. The multistage vibration isolation rubber-sliding system support according to claim 5, wherein the stainless steel sliding plates are welded on the inner side surfaces of the top plate (10), the first intermediate sliding plate (6), the second intermediate sliding plate (8) and the bottom plate (12), grooves are formed in the outer side surfaces of the first intermediate sliding plate (6), the upper connecting plate (4), the second intermediate sliding plate (8) and the lower connecting plate (5), the polytetrafluoroethylene plates are embedded in the grooves, and the corresponding polytetrafluoroethylene plates are in contact with the stainless steel sliding plates.
7. Multistage vibration-isolated rubber-slip system mount according to claim 2, wherein the dynamic friction coefficient of each of the first sliding friction pair (11) and the second sliding friction pair (7) is smaller than the dynamic friction coefficient of each of the third sliding friction pair (9) and the fourth sliding friction pair (13).
8. A multi-stage vibration-isolating rubber-sliding system mount according to claim 2, wherein said laminated shock absorber (1) comprises a laminated rubber body composed of a plurality of rubber layers and a plurality of steel plates.
9. The multistage vibration-isolating rubber-sliding system support according to claim 2, wherein the top plate (10) is square, and four corners of the top plate (10) are provided with connecting holes (15).
10. The method for calculating the seismic isolation effect of the multistage-seismic-isolation rubber-slip system support according to claim 2, characterized by comprising the following steps of:
local vibration acceleration exceeding mu1When the sliding is started, the first sliding friction pair (11) and the second sliding friction pair (7) start to slide, and the relative sliding acceleration a1Calculated by the following formula:
a1＝ag-μ1g (1)
in the formula (1), agIs the input original seismic acceleration, g is the gravity acceleration, mu1Is the dynamic friction coefficient of the first sliding friction pair and the second sliding friction pair, a1Relative sliding acceleration of the first sliding friction pair and the second sliding friction pair is obtained;
relative at any time tSliding velocity v1(t) and relative sliding displacement d1(t) can be calculated by the following formula:
d1(t)＝L1 (3)
wherein v is1(t0) And d1(t0) Are each t0Relative sliding speed and relative sliding displacement of the first sliding friction pair and the second sliding friction pair at the moment; the limited displacement of the upper sliding system (2) and the lower sliding system (3) is respectively L1And L2If the first sliding friction pair and the second sliding friction pair stop sliding, the judgment conditions are as follows:
v1(t) 0 or d1(t)＝L1
When d is1(t)＝L1When the earthquake motion continues in the same direction, the local vibration acceleration exceeds mu2When the corresponding third sliding friction pair (9) and fourth sliding friction pair (13) start to slide, the relative sliding acceleration a of the sliding friction pairs2Relative sliding velocity v2(t) and relative sliding displacement d2(t) can be calculated in the same manner as in the above formula; finally, the ultimate working conditions of the third sliding friction pair (9) and the fourth sliding friction pair (13) are as follows:
d1(t)＝L1，d2(t)＝L2
in the whole earthquake motion action process, earthquake motion acceleration a 'after energy dissipation and shock insulation is carried out through sliding of friction pairs of the upper sliding system (2) and the lower sliding system (3)'gCalculated by the following formula:
a'g＝ag-a1-a2 (4)。
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