CN103306316A - Three-dimensional composite friction pendulum vibration isolator based on nonlinear energy trap - Google Patents
Three-dimensional composite friction pendulum vibration isolator based on nonlinear energy trap Download PDFInfo
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- CN103306316A CN103306316A CN 201310169183 CN201310169183A CN103306316A CN 103306316 A CN103306316 A CN 103306316A CN 201310169183 CN201310169183 CN 201310169183 CN 201310169183 A CN201310169183 A CN 201310169183A CN 103306316 A CN103306316 A CN 103306316A
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Abstract
The invention discloses a three-dimensional composite friction pendulum vibration isolator based on a nonlinear energy trap. Structural vibration frequency is staggered away from seismic oscillation dominant frequency and a large amount of seismic oscillation input energy is absorbed by using the characteristics of attenuation and absorption of vibration energy, absorption of vibration frequency bandwidth and the like existing in the nonlinear energy trap as well as a vertical vibration isolation disk-shaped spring, so that the multi-dimensional seismic response of a structure is reduced, and seismic hazards of building structures are prevented. The three-dimensional composite friction pendulum vibration isolator comprises a metal sliding sleeve, a disk-shaped spring, a polytetrafluoroethylene sliding joint, a nonlinear energy trap and pile caps, wherein the disk-shaped spring is arranged in the metal sliding sleeve; the polytetrafluoroethylene sliding joint is arranged on the disk-shaped spring; the polytetrafluoroethylene sliding joint is in relative sliding contact with an upper pile cap through a polytetrafluoroethylene coating; the side face of the nonlinear energy trap is connected with the disk-shaped spring through a rigid spring; the nonlinear energy trap is in rolling contact with a lower pile cap through a rolling shaft; sliding surfaces of the upper and lower pile caps are spherical surfaces. The three-dimensional composite friction pendulum vibration isolator is used for resisting possible violent earthquakes.
Description
Technical field:
The present invention relates to a kind of three-dimensional compound friction pendulum isolator based on non-linear energy wells, belong to earthquake isolation control field.
Background technology:
From the seismographic record obtained as can be seen, because earthquake mechanism, different apart from distance and place soil layer property, each seismographic record has its specific dominant frequency, namely has abundant energy in some frequency.The rigidity of common non-shock insulation tier building is big, the cycle short, and its basic cycle, just in time on the frequency range of earthquake input energy maximum, therefore corresponding acceleration response was more much bigger than ground motion.If make the frequency of structure motion miss the abundant dominant frequency of these energy contents, just can reduce the seismic response of structure.
Summary of the invention:
The purpose of this invention is to provide a kind of three-dimensional compound friction pendulum isolator based on non-linear energy wells.
Seismic isolation technology is exactly a kind of a kind of means of effective reduction seismic response, by being arranged on superstructure and the shock-absorbing and energy-dissipating device between the lower support structure time, reduces seismic energy to the input of superstructure, thereby reduces the vibration of superstructure.Working mechanism based on traditional friction pendulum, though displacement and the displacement of superstructure interlayer that can obviously reduce agent structure horizontal earthquake reaction input but amplify the shock insulation layer simultaneously, can not reach the vertical geological process of attenuating structure, and it is only just effective at the seismic stimulation of certain frequency, produce resonance with nearly tomography long period impulse type seismic wave easily, these all become restriction friction-pendulum shock-insulation technology to the great bottleneck of degree of depth practicability development, and other seismic isolation technology also often seems unable to do what one wishes in the face of these challenges the time.A kind of three-dimensional compound friction pendulum isolator based on non-linear energy wells is now proposed, the non-linear energy wells of one of the educational circles of international vibration isolation in recent years forward position focus is applied to breakthroughly the improvement of friction-pendulum shock-insulation device, utilize efficient absorbing rate, the absorbing bandwidth that himself has and can realize target energy transfer etc. novel characteristics, can make the friction-pendulum shock-insulation device realize the function of good distortion decay seismic energy, fully keep traditional shock isolating pedestal feature again, can effectively solve the excessive and vertical base isolation problem of shock insulation layer displacement.The disk spring vertical vibration-damping apparatus is composed in parallel by disk spring and viscoelastic damper.Can effectively solve the difficult problem of vertical large bearing capacity and vertical damping.This device not only has suitable energy-dissipating and shock-absorbing ability, and stable performance, compact conformation, and processing and fabricating is easy.Except being used for to be used for the vibration isolation of plant equipment the base isolation of engineering structures.Therefore, have broad application prospects.On the basis of fully having studied based on the three-dimensional compound friction pendulum earthquake isolating equipment characteristics of non-linear energy wells, design has also been made the damping device model, the energy-dissipating and shock-absorbing effect of this model is carried out static load and dynamic loading test research and theory analysis, studied parameters such as equivalent damping ratio, friction factor, restoring force model, rigidity, vibration frequency.Result of study shows: this three-dimensional compound friction pendulum earthquake isolating equipment has ability and suitable rigidity and the damping capacity of good distortion decay seismic energy, and the vertical earthquake vertical rigidity in the shock insulation layer, vertical bearing capacity and effective enough effective displacements can both be satisfied the deformation requirements under big shake, design earthquake and effect.
Above-mentioned purpose realizes by following technical scheme:
A kind of three-dimensional compound friction pendulum isolator based on non-linear energy wells, its composition comprises: be fixed on down the following bearing sheet Internal Spherical Surface base on the apron piece, put round metal tubular sliding sleeve on the bearing sheet Internal Spherical Surface base under described, built-in involutory combined type disk spring, put the polytetrafluoroethylene (PTFE) arthrodia on the described involutory combined type disk spring, described convex surface polytetrafluoroethylene (PTFE) arthrodia contacts with sphere with last bearing sheet by polytetrafluorethylecoatings coatings, described top deck links to each other with last apron piece, described round metal tubular sliding sleeve links to each other by rigid spring with non-linear energy wells, and described non-linear energy wells contacts with bottom deck by roller bearing.
Further, described top deck bottom is smooth sphere, and the arthrodial convex surface diameter of described convex surface polytetrafluoroethylene (PTFE) is consistent with the top deck smooth sphere, but the convex spherical chord length is less than the chord length of top deck; Described bearing sheet Internal Spherical Surface down is smooth sphere, and described round metal tubular sliding sleeve soffit convex surface diameter is consistent with the top deck smooth sphere, but the convex spherical chord length is less than the chord length of top deck.
Three-dimensional compound friction pendulum isolator based on non-linear energy wells belongs to earthquake isolation control field.
Based on the three-dimensional compound friction pendulum isolator of non-linear energy wells, its composition comprises: 1, following bearing sheet; 2, involutory combined type disk spring; 3, non-linear energy wells; 4, rigid spring; 5, convex surface polytetrafluoroethylene (PTFE) arthrodia; 6, round metal tubular sliding sleeve; 7, go up bearing sheet; 8, polytetrafluorethylecoatings coatings; 9, go up embedded bar; 10, go up apron piece; 11, following apron piece; 12, following embedded bar; 13, roller bearing.
Device body is made up of non-linear energy wells, rigid spring, round metal tubular sliding sleeve, involutory combined type disk spring, polytetrafluoroethylene (PTFE) arthrodia.Described non-linear energy wells is connected with rigid spring with round metal tubular sliding sleeve; Described involutory combined type disk spring places round metal tubular sliding sleeve inside, and described polytetrafluoroethylene (PTFE) arthrodia also places in the round metal tubular sliding sleeve, connects involutory combined type disk spring and last bearing plate, contacts with sphere with last bearing plate; Described device body round metal tubular sliding sleeve bottom surface is convex spherical, contacts with sphere with following bearing plate.
This technical scheme has following beneficial effect:
1, between the bottom that can be arranged on building based on the three-dimensional compound friction pendulum isolator of non-linear energy wells and the basic end face, also can be arranged on foundation bottom, separate on the basis in making superstructure and being cemented in ground, the natural vibration period of extending structure.Utilize the non-linear rigidity spring of non-linear energy wells not have specific intrinsic frequency simultaneously, can and absorb energy with the multistage frequency vibration of main structure, the new kink characteristics that has big absorbing bandwidth again reaches the purpose that decay consumes the earthquake motion energy and suppresses the influence of long period seismic wave.If the damping of building is constant, then acceleration response is greatly diminished, thereby reduces the earthquake response of structure, hinder seismic wave to the top structure-borne, reduce or eliminated the damage of structural element, guaranteed the safety of building better, reach the purpose of structure " no collapsing with strong earthquake ".Therefore the present invention can be used for resisting following contingent vibrations consumingly.
2, the two layers of slide plane up and down based on the three-dimensional compound friction pendulum isolator of non-linear energy wells are sphere, and dead load and vertical geological process are provided by the restoring force of device body.The distinctive circular sliding surface of three-dimensional compound friction pendulum isolator based on non-linear energy wells not only makes it have from limit, from reset function and good stability of vibration, need not to set up damping to concentric mechanism, and earthquake energy greatly, thereby the displacement that reduces shock insulation layer and superstructure reduces earthquake response.This device is more easy in actual applications, increases the reliability of earthquake isolating equipment.The friction factor difference of two-layer slide plane can provide different hunting frequencies up and down.Under little shake effect, device body is along bearing plate slip (going up pendulum) in the upper strata; Under the geological process of setting up defences and the big shake effect, device body is along lower floor's bearing plate slip (bottom); Therefore stage and the cycle of swing can be set according to big shake and design earthquake response by the friction factor of selecting sphere curvature radius and each slip concave surface.Each slide plane has fixing radius of curvature in a certain critical displacement range, in case when bearing slide displacement amount surpassed this critical displacement, its slide plane namely became the inclined-plane of a fixed slope, the shock insulation cycle namely becomes infinity, that is does not have resonance cycle.
3, involutory combined type disk spring can also effectively be resisted vertical geological process, has effectively remedied the shortcoming that general friction-pendulum shock-insulation device can only be resisted horizontal earthquake action
4, the present invention is not particularly limited form of structure and the number of plies, easy construction, but following applicable elements is arranged:
(1) more complete apron piece is arranged.
(2) superstructure structure connection (as frame column, collar tie beam, constructional column etc.) is more
Description of drawings: accompanying drawing 1 is the structural representation of this product.Description of reference numerals is as follows:
1---following bearing sheet; 2---involutory combined type disk spring; 3---non-linear energy wells; 4---rigid spring; 5---the polytetrafluoroethylene (PTFE) arthrodia; 6---sliding sleeve; 7---go up bearing sheet; 8---polytetrafluorethylecoatings coatings; 9---go up embedded bar; 10---go up apron piece; 11---following apron piece; 12---following embedded bar; 13---roller bearing.
The specific embodiment:
Embodiment 1:
Based on the three-dimensional compound friction pendulum isolator of non-linear energy wells, its composition comprises: device body is made up of round metal tubular sliding sleeve 6, involutory combined type disk spring 4 and polytetrafluoroethylene (PTFE) arthrodia 5.Round metal tubular sliding sleeve 6 contacts with following bearing sheet 1, involutory combined type disk spring 4 is positioned in the round metal tubular sliding sleeve 6, put polytetrafluoroethylene (PTFE) arthrodia 5 on the involutory combined type disk spring 4, polytetrafluoroethylene (PTFE) arthrodia 5 contacts with last bearing sheet 7 by polytetrafluorethylecoatings coatings 8; Last bearing sheet 7 links to each other with last apron piece 10 by last embedded bar 9; Non-linear energy wells 3 links to each other with round metal tubular sliding sleeve 6 by rigid spring 4; Non-linear energy wells 3 contacts with following bearing sheet 1 by roller bearing 13; Bottom deck 1 and top deck 7 are all sphere with the contacted slide plane of device body.
Embodiment 2:
The above-mentioned three-dimensional compound friction pendulum isolator based on non-linear energy wells, described top deck 7 soffits are smooth sphere, described top deck 7 links to each other with last apron piece 10 by last embedded bar 9, and embedded bar 12 linked to each other with following apron piece 11 under described bearing sheet down 1 passed through.When device body (round metal tubular sliding sleeve 6, involutory combined type disk spring 4, polytetrafluoroethylene (PTFE) arthrodia 5) after the sphere of the relative top deck 7 of end face slides, the gravity of superstructure provides a restoring force of getting back to former balance position can for the top cap, convex spherical 6 radiuses of described polytetrafluoroethylene (PTFE) arthrodia 5 are consistent with top deck 7 smooth spheres, but the convex spherical chord length will be controlled in 1/3～1/4 of top deck chord length.
The course of work is described:
The above-mentioned three-dimensional compound friction pendulum isolator based on non-linear energy wells for newly constructed house, will consider that earthquake isolating equipment respectively needs one deck apron piece up and down when design, guarantee that each becomes whole to the shock insulation layer up and down.
In the middle of when shake takes place doughtily, the horizontal rigidity of earthquake isolating equipment is less, frictional force between polytetrafluoroethylene (PTFE) arthrodia 5 and the polytetrafluorethylecoatings coatings 7 is very little, structure is the occurred level Flexible Sliding about this layer, the antidetonation system of " rigidity " the is become isolation structure system of " flexibility ", prolong (T=2～4s) for example its natural vibration period greatly, away from (Ts=0.2～1.2s) and the place eigenperiod (Tg=0.2～1.0s) natural vibration period of superstructure, thereby ground vibration is separated effectively, reduce the earthquake response of superstructure significantly.Non-linear energy wells 3 makes this earthquake isolating equipment have good distortion attenuation function by the influence of rigid spring 4 performances to the dissipation inhibition long period seismic wave of main body isolation structure vibrational energy.Involutory combined type disk spring 4 can not only effectively be resisted vertical geological process, also has the characteristic that elastic deformation, elasticity are recovered, born vertical load and earthquake energy simultaneously.
The effect of putting isolator based on the three-dimensional compound friction of non-linear energy wells is: utilize the high absorbing rate of non-linear energy wells NES to finish the implementation method of optimum target energy transmission to promote the decay to the isolation structure vibrational energy significantly in shock isolation system on the one hand, can prolong the natural vibration period of building on the other hand, the fundamental frequency of structure is in outside the high-energy seismic frequency scope, thereby can reduces the earthquake response of building effectively.The friction-pendulum shock-insulation device not only can not be lost its supporting capacity when support of buildings, but also wants to bear the big displacement between basis and the superstructure.
Should take mounting means behind the earthquake isolating equipment for the shock insulation stabilization works.After cutting off insulating course stake, post or wall partly earthquake isolating equipment is installed again, must be guaranteed construction safety at behind the house foundation periphery backfill excavation dangerous situation that occurs being carried out necessary interim support, protection to house integral body or part at this moment; Antidetonation countermeasure in sequence of construction, construction precision, the construction etc. is carried out design.
If the shock insulation stabilization works of pile foundation part can be installed earthquake isolating equipment in the following order:
(1) excavation pit excavates the basis, bottom around building;
(3) set bearing plate, temporary support structure is installed, cut off stake, post;
(4) metal embedded part and earthquake isolating equipment are installed;
(5) withdraw interim support;
(6) basic earthwork backfill, compacting.
Claims (2)
1. the three-dimensional compound friction based on non-linear energy wells is put isolator, its composition comprises: be fixed on down the following bearing sheet on the apron piece, described round metal tubular sliding sleeve is that convex spherical contacts with bottom deck, described involutory combined type disk spring is positioned in the round metal tubular sliding sleeve, described polytetrafluoroethylene (PTFE) arthrodia upper surface is protruding sphere with last bearing sheet to contact with the curvature sphere, the bottom is then stretched in the round metal tubular sliding sleeve and is contacted with disk spring, the non-linear energy wells of metal links to each other with round metal tubular sliding sleeve by rigid spring, the non-linear energy wells of metal contacts with bottom deck by roller bearing, and the contacted slide plane of bottom deck and top deck and device body is all sphere.
2. the three-dimensional compound friction based on non-linear energy wells according to claim 1 is put isolator, it is characterized in that: the non-linear energy wells of described metal links to each other with the earthquake isolating equipment body by rigid spring, and the non-linear energy wells quality of metal is far smaller than the quality of earthquake isolating equipment body; Described top deck bottom is smooth sphere, and the arthrodial radius of described polytetrafluoroethylene (PTFE) is consistent with the top deck smooth sphere, but the convex spherical chord length is less than the chord length of top deck; The built-in disk spring of described genus cylindrical shape sliding sleeve.
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| CN105256910A (en) * | 2015-09-24 | 2016-01-20 | 同济大学 | Fully nonlinear rubber spring damping device |
| CN105332442A (en) * | 2015-11-05 | 2016-02-17 | 同济大学 | Particle damper with nonlinear rigidity |
| CN105370792A (en) * | 2015-12-23 | 2016-03-02 | 黄斌 | Shock isolation device for construction equipment |
| CN105804261A (en) * | 2016-03-21 | 2016-07-27 | 同济大学 | Suspended type novel material damper |
| CN105863098A (en) * | 2016-05-11 | 2016-08-17 | 东北林业大学 | Multistage frequency conversion friction pendulum and spring three-dimensional composite shock isolator |
| CN106121076A (en) * | 2016-06-24 | 2016-11-16 | 马鞍山市秋枫工程塑料异型材料制造有限责任公司 | A kind of skyscraper shock-damping structure and method of construction thereof |
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| CN105256910B (en) * | 2015-09-24 | 2017-07-28 | 同济大学 | Complete non-linear rubber spring damping device |
| CN105332442B (en) * | 2015-11-05 | 2017-06-13 | 同济大学 | Granule damper with non-linear rigidity |
| CN105332442A (en) * | 2015-11-05 | 2016-02-17 | 同济大学 | Particle damper with nonlinear rigidity |
| CN105370792A (en) * | 2015-12-23 | 2016-03-02 | 黄斌 | Shock isolation device for construction equipment |
| CN105804261A (en) * | 2016-03-21 | 2016-07-27 | 同济大学 | Suspended type novel material damper |
| CN105863098A (en) * | 2016-05-11 | 2016-08-17 | 东北林业大学 | Multistage frequency conversion friction pendulum and spring three-dimensional composite shock isolator |
| CN106121076A (en) * | 2016-06-24 | 2016-11-16 | 马鞍山市秋枫工程塑料异型材料制造有限责任公司 | A kind of skyscraper shock-damping structure and method of construction thereof |
| CN106121076B (en) * | 2016-06-24 | 2019-06-25 | 马鞍山市秋枫工程塑料异型材料制造有限责任公司 | A kind of skyscraper shock-damping structure and its method of construction |
| CN106522375A (en) * | 2016-10-26 | 2017-03-22 | 清华大学 | Frictional pendulum sliding support |
| CN106522375B (en) * | 2016-10-26 | 2019-03-01 | 清华大学 | Friction pendulum slip support abutment |
| CN107604810A (en) * | 2017-08-04 | 2018-01-19 | 东南大学 | A kind of Self-resetting friction pendulum three-dimensional shock damping and insulation bearing |
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| CN107461450B (en) * | 2017-08-08 | 2019-03-22 | 北京空间飞行器总体设计部 | A kind of Nonlinear Dynamic Vibration Absorbers of achievable target energy transmission |
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Application publication date: 20130918 |