CN1067700A - PTFE damping box on the building foundation - Google Patents
PTFE damping box on the building foundation Download PDFInfo
- Publication number
- CN1067700A CN1067700A CN 91103794 CN91103794A CN1067700A CN 1067700 A CN1067700 A CN 1067700A CN 91103794 CN91103794 CN 91103794 CN 91103794 A CN91103794 A CN 91103794A CN 1067700 A CN1067700 A CN 1067700A
- Authority
- CN
- China
- Prior art keywords
- ptfe
- damping
- damping box
- building
- foundation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
Abstract
PTFE damping box on the building foundation, it belongs to building building technology.The coefficient of sliding friction between PTFE damping box top cover and base plate is 0.02, and it is placed between the upper lower burrs on basis, constitutes the composite foundation that can slide between a kind of upper lower burrs.When the basis lower wall moved with seimic ground level, because the existence of damping box, passing to the basic horizontal force of going up dish 4 only was its frictional force, and F=0.02W, W are superstructure deadweight and loading, are equivalent to the horizontal seismic force of 5 °～6 ° of intensity area.Reach the effect of damping.PTFE damping box can be placed on the strip foundation, and sheet cuts down, and on the box foundation, also can be used on the single footing of reinforced concrete frame post, on the basis of some structure, also can be placed on other position of building and structure.
Description
The invention belongs to building building technology, PTFE damping box can be positioned on the basis of building or other positions, is a kind of simple and effective glissando.
Earthquake is very big to the destructiveness of building, and especially to brick mix structure, it is very general and serious destroying 8 °, 9 ° and above intensity area, and the people's lives and property is caused very big harm.Earthquake is very complicated to the failure mechanism of building, factor is a lot, earthquake itself very big with chance property, be difficult to give and estimate existing earthquake resistant code and adopt the response spectrum method to calculate seismic forces, also be a kind of approximate method, the design principles of earthquake resistant code is to split and do not fall, and alleviates the destruction of building, avoid casualties, reduce economic loss.Building will increase cost for this reason, is 1-3% for 8 ° of districts, and 9 ° of districts are 5-8%, even so, still is difficult to reach gratifying effect.Actual earthquake is still very big to the destruction of building, is decided to be 6 ° of intensity area as Tangshan is former, and 7.8 grades of violent earthquakes took place on July 28th, 1976, the urban district earthquake intensity is XI degree and X degree, in XI degree district, various houses fall to put down substantially, indivedual heavy damages, X degree district, multistory brick-and-concrete structure, industrial premises, reinforced concrete frame, great majority collapse or heavy damage, and casualties reaches 400,000, worldwide earthquake frequently takes place especially, causes a tremendous loss of lives and property loss.Various countries also lack the cost-effective means of resisting at present, effectively resist earthquake disaster, are the big problem of pendulum in face of the people of the world.
The objective of the invention is to propose a kind of PTFE damping box, polytetrafluoroethylene (PTFE) is called for short F
4, have chemical-resistant stability.Heat resistance, serviceability temperature are-200 ℃-260 ℃, and suction is ageing-resistant hardly, F
4The compressive strength of plate, 25 ℃ is 129kg/cm during 5% distortion
2, for obtaining F
4Best rigidity, requiring its degree of crystallinity is 75-80%.Greasy property is good, and friction factor is very low, with the coefficient of sliding friction of steel be 0.04-0.12.The last lid and bottom of PTFE damping box are posted polyfluortetraethylene plate and stainless steel polishing plate respectively, fill out therebetween with 295 silicone grease, its coefficient of sliding friction is below 0.02, PTFE damping box is positioned between the upper lower burrs on basis, constitute the composite foundation that can slide between a kind of upper lower burrs, its coefficient of sliding friction drops to below 0.02, passes to the power that dish is gone up on the basis, be its frictional force only, thereby reach the purpose of damping.
Invention is to realize like this, when earthquake causes the ground level motion, the lower wall 1 on basis is with its motion, by the coefficient of sliding friction of PTFE damping box thereon is 0.02, the horizontal seismic force that it is superstructure that basic upward dish 4 is passed in event only is its frictional force, be on it loading 2%, and reach the purpose of damping.
For the building of placing II type PTFE damping box except that can be to the horizontal earthquake load damping, but to vertical seismic forces also damping.
Fig. 1, PTFE damping box are placed on the strip foundation.
Fig. 2, PTFE damping box are placed on the single footing of reinforced concrete frame post.
Fig. 3, PTFE damping box I type
Fig. 4, PTFE damping box II type
Fig. 5, earth sectional schematic diagram
Fig. 6, seimic wave propagation and forms of motion schematic diagram
Fig. 7, typical earthquake acceleration schematic diagram
The operating principle of PTFE damping box on the building foundation is described in conjunction with Fig. 1, Fig. 2, when earthquake causes the horizontal movement on ground, the lower wall 1 on basis is with its motion, by the end 2 of thereon PTFE damping box and the coefficient of sliding friction between the lid 3 be 0.02, only be 0.02 times of loading on it so pass to the horizontal force of going up dish 4 in the basis, be frictional force F=0.02W, W is superstructure deadweight and loading.The horizontal seismic force that is equivalent to 5 °, 6 ° earthquake intensity.Thereby reach the purpose of damping.Because friction factor and movement velocity relation are little, in other words, no matter the earthquake of much earthquake magnitudes takes place, with much intensity area, the suffered horizontal seismic force of superstructure changes little, all is 0.02W, removes the cycle that the non-friction direction changes, it is the cycle of ground movement acceleration, approaching with the natural vibration period of superstructure, resonate, horizontal force just can increase, but because the existence of the damping of building own, make its magnifying power numerical value become finite quantity, as amplify 8 times, just be equivalent to the horizontal seismic force of 8 ° of earthquake zonies, horizontal seismic force is much smaller when still than the building that does not apply damping box resonance taking place, and can avoid house collapse.From also reminding us here, even placed PTFE damping box on the building foundation, must avoid the predominant period of foundation soil the natural vibration period of building.
In conjunction with Fig. 3, Fig. 4 the making of PTFE damping box being described, is the damping effect of realizing PTFE damping box, must guarantee the enough little coefficient of sliding friction between polyfluortetraethylene plate and corrosion resistant plate, and this just requires corrosion resistant plate and F
4The plate surfacing is smooth, and the lubricating grease filling therebetween.
Fig. 3 is seen in the making of PTFE damping box I type, and other has some explanation:
1, top board 4 base plates 1 of box can be with plastic production ageing-resistant, water-fast, cold-resistant, corrosion-resistant, difficult combustion, as chlorinated polyvinyl chloride CPVC, r=1.5, σ=610kg/cm
2,-20 ℃ of impact strengths are 25-60kg/cm
2, the about 20 yuan/kg of sheet material price, roof and floor thickness can be used the thick chlorinated polyvinyl chloride plate of 3mm.
2, the polyfluortetraethylene plate 3 that 1.5mm is thick, i.e. F
4Plate is of a size of a-200, b-200, F
4The one side of plate is after purified treatment such as degreasing, 3-5 in this face immersion naphthalene-sodium complex liquid is taken out (another side definitely can not be stained with) after second, immediately this face is immersed and remove superfluous organic matter (another side can not be stained with) in the acetone, dry down in infrared rays after the water flushing again, the Φ 5 that holes thereon, spacing 35.Sodium in the naphthalene sodium complex molecule can destroy F
4The C-F key on surface is separated F, carbonization takes place, the F after this carbonization
4The surface is coated with the DG-3 bonding adhesive, on the chlorinated polyvinyl chloride top board of composite pressing after rubber is polished, and normal temperature cure.
3, the 1Cr18Ni9Ti corrosion resistant plate 2 that 1.5mm is thick is of a size of a, b, and a mirror polish, other rubber polishing is coated with the DG-3 bonding adhesive, on the chlorinated polyvinyl chloride base plate of composite pressing after rubber is polished, normal temperature cure.
4, at F
4Reach F in the hole, garden of plate
4And be coated with 295 thicker silicone grease 6 of one deck between corrosion resistant plate, with lubricated.
5, be F with the thick polyvinyl fluoride thin film of 50 μ m
1Film 5, wide by 140, each is 20 wide up and down, is coated with the DG-3 bonding adhesive and sticks on chlorinated polyvinyl chloride top board 4 and the base plate 1, around the sealing PTFE damping box.F
1Hair side should be got with sand paper earlier in film and chlorinated polyvinyl chloride plate abutting edge, compresses normal temperature cure after the bonding.
Polyvinyl fluoride has anticorrosive property, good cryogenic property, and serviceability temperature-100-150 ℃, be celebrated so that weatherability is ageing-resistant, hot strength is 450kg/cm
2, elongation rate 115-250%, water absorption rate 0.5%.
Fig. 4 is seen in the making of PTFE damping box II type.Explanation is with the I type, i.e. chlorinated polyvinyl chloride base plate 1 in the PTFE damping box II type, top board 4, corrosion resistant plate 2, F
4Plate 3, polyvinyl fluoride weather strip 5,295 silicone grease 6, all be same as damping box I type, only add the thick neoprene plate 7 of one＞15mm for 2 times at corrosion resistant plate, size is with corrosion resistant plate 2, in order to the damping of vertical seismic forces, just with the DG-3 bonding adhesive with sticking on the neoprene plate 7 below the corrosion resistant plate of surperficial rubber polishing, stick on the chlorinated polyvinyl chloride base plate down.
In conjunction with Fig. 5,6,7, from the structure of the earth, the formation of earthquake, the type of seismic wave, proterties and the relevant damping effect that further specifies teflon carrier of quoting as proof.
The earth is that an average diameter is 6400 kilometers an ellipse garden spheroid, so far the history in existing 4,500,000,000 years.Three layers that earth do as one likes matter is different constitute, and outermost layer is the very thin earth's crust, and the centre is very thick earth mantle, the innermost earth's core that cries, and as shown in Figure 5, most in the world earthquakes occur in the earth's crust.
Push earth's crust rock stratum by the natural force that crustal movement produces, make its weak part that fracture dislocation take place suddenly, cause vibration, i.e. earthquake.
Seimic vibration is propagated to all directions from focus with the form of ripple, Here it is seismic wave, and seismic wave is a kind of elastic wave, it comprises two kinds of bulk waves that can be by earth body and is only limited near propagate the ground two kinds of ground rolls, as shown in Figure 6.
Bulk wave includes compressional wave and shear wave, and compressional wave also claims the P ripple, is the compressional wave that is outwards transmitted by focus, and the direction of vibration of particle is consistent with the direction of advance of ripple, and the cycle that generally shows as is short, amplitude is little; Shear wave also claims the S ripple, it is the shearing wave that outwards transmits by focus, the direction of vibration of particle and the direction of advance of ripple are perpendicular, it is longer generally to show as the cycle, amplitude is bigger, and the vibration of horizontal direction is bigger than the vibration of vertical direction, and the S ripple can only be propagated in solid, and the P ripple can both be propagated in solid, fluid.
Ground roll also claims the L ripple, generally can be described as the secondary wave that bulk wave repeatedly reflects to form through bed boundary, and it comprises auspicious Leibo and Love wave, and the acceleration of L ripple correspondence generally all is less.
From the ground acceleration kymogram, Fig. 7 as can be seen, the P ripple arrives at first, it is slower that the S ripple arrives, ground roll arrives bulk wave after, generally from the P ripple to the vibration the S ripple initial fine motion, the later vibration of S ripple is principal oscillation.
The vibration of mean level direction is greater than vertical motion during earthquake, and the ability of house opposing horizontal seismic force is less than the ability of the vertical seismic forces of opposing, and therefore the glissando to building carrying out horizontal direction is very necessary, and is can simultaneously vertical damping better.
The low-friction coefficient of polytetrafluoroethylene (PTFE) all has argumentation in many scientific and technical workses, at " chemical products handbook, synthetic resin and plastics " middle P155, the polytetrafluoroethylene (PTFE) greasy property is good, having very low sound attitude friction factor, is 0.07 to the friction factor of metal, and the self friction coefficient is low to moderate 0.01, in " engineering plastics application " P64 page or leaf that First Machinery Industry Department's Materials Research Laboratories is compiled, F
4Static and dynamic friction coefficient to steel is 0.04, and in " engineering plastics " that Shi Fuan compiles, F4 has very little coefficientoffriction, μ increases with the increase of V, tend towards stability when above to linear velocity 0.5-1m/s, and μ quiet＜μ is moving, μ reduces with the increase of load, to load 8 * 10
5Be tending towards constant when Pa is above, the μ of F4 can be lower than 0.01 under the high speed high load capacity, and μ do not vary with temperature, and only when surface temperature was higher than fusing point, friction factor just sharply increased.F4 is to the friction factor 0.09-0.12 of metal among " English " J.A. Bu Laidesen work " plastic material " P384, self friction coefficient 0.02-0.10, " plastics performance evaluation " P96 of Shanghai plastic institute Huang Deyu chief editor, the friction factor minimum of pure polytetrafluoroethylene (PTFE), 0.131-0.136, filled polytetrafluoroethylene is a kind of desirable bearing and supporting slide block material, friction factor improves few, compression creep reduces a lot, as 20% carbon fiber filler polytetrafluoroethylene (PTFE), compressive strength is 187kg/cm at 25 ℃ during 5% distortion
2, μ=0.17.And the coefficientoffriction of polytetrafluoroethylene (PTFE) is relevant with friction condition, and μ is about 0.02 when oil dripping rubs.
Among Miu Jingyuan, the Ye Mubian " fluoroplastics-processing and application ", F
4The low-friction coefficient of supporting slide block and high bearing capacity are widely used as the supporting slide block of bridge etc., its polyfluortetraethylene plate and stainless actual measurement μ＜0.05, again according to the comrade of railway research institute bridge chamber, add lubricating grease after, μ=0.001-0.005.
That the most close with this PTFE damping box situation is exactly F
4Supporting slide block, I estimate that its friction coefficient mu is to record under very little speed, and ground movement speed is bigger during earthquake, below the general 1m/s, but the time have only 1-2 minute, with reference to their experimental result, I get the F of PTFE damping box
4The coefficient of sliding friction of plate and stainless steel polishing plate is 0.01, considers that one is used the safety factor 2 more than 50 years for a long time, is taken as 0.02.
Also can use filler polytetrafluoroethylene (PTFE) or F
46Deng replacing polytetrafluoroethylene (PTFE), as replacing F with 20% carbon fiber filler polytetrafluoroethylene (PTFE)
4Do damping box, its bearing capacity improves 1.5 times, and creep reduces a lot, and μ slightly increases.
PTFE damping box can be used for 7 °, and 8 °, on the building and structure of 9 ° and above intensity area, can be positioned on the strip foundation of multi-storey building, as shown in Figure 1, wherein 5 is 50 thick seams, the pitch flax silk is filled out in the seam outside, smears 20 solid cement mortars outward.6 is 160 wide F
1Film sticks at the basis with the DG-3 bonding adhesive and goes up dish 4, and each is 20 wide for lower wall 1, in order to seal the space between the basic upper lower burrs.Also can be placed on the single footing of multistory reinforced concrete frame post, as shown in Figure 2, structure is the same shown in 5,6; Bar shaped, the sheet that also can be placed on highrise building cuts down or the top of box foundation, shown in similar Fig. 1,2.
The structure of placing PTFE damping box should take into full account himself stability, adopts aspect ratio, and the less bodily form of depth-width ratio is for well.The friction factor of damping box calculates frictional force by 0.01 when considering wind load, and to resist the wind lotus, insufficient section is resisted with the motar of 5 shown in Fig. 1,2, the size of showing this area's wind load, the label and the thickness of decision motar, its energy wind resistance, but can not be antiseismic.
The PTFE damping box damping effect can reach 50-60%, and it is few to increase cost, is below 2% to 8 ° of districts, or does not increase cost, and 9 ° of districts do not increase cost, or reduces cost.
Claims (4)
1, polytetrafluoroethylene (PTFE) has very low friction factor, and this is to have in the scientific and technological book, but utilizing its this characteristic is my invention with damping, and the PTFE damping box on a kind of building foundation is exactly an embodiment.
2, described by claim 1, the PTFE damping box on a kind of building foundation, many damping boxes place between the upper lower burrs on basis, constitute the composite foundation that can slide between a kind of upper lower burrs.Damping box is an obturator, it is characterized in that: post polyfluortetraethylene plate and corrosion resistant plate on top board and the base plate respectively, sliding agent is full of therebetween, can slide between them, and sidewall can slide with top board and base plate with the sealing of flexible plastic film.PTFE damping box has I type and II type.It is characterized in that the I type is to the horizontal seismic force damping, the II type is to level and brisance can damping vertically.
3, described by claim 1, the low-friction coefficient material has polytetrafluoroethylene (PTFE), 20% carbon fiber filler polytetrafluoroethylene (PTFE), F46 etc.
4, described by claim 1, PTFE damping box can be positioned on the strip foundation of building, sheet cut down with box foundation on, on the single footing of reinforced concrete frame post, on the basis of some structure or the like, PTFE damping box also can be used for other position of building and structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91103794 CN1067700A (en) | 1991-06-13 | 1991-06-13 | PTFE damping box on the building foundation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91103794 CN1067700A (en) | 1991-06-13 | 1991-06-13 | PTFE damping box on the building foundation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1067700A true CN1067700A (en) | 1993-01-06 |
Family
ID=4906262
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91103794 Pending CN1067700A (en) | 1991-06-13 | 1991-06-13 | PTFE damping box on the building foundation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1067700A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101769016A (en) * | 2010-03-09 | 2010-07-07 | 张德新 | Anti-seismic device of building |
| CN104032766A (en) * | 2014-05-16 | 2014-09-10 | 同济大学 | LNG liquid storage tank shock insulation layer |
| US9926972B2 (en) | 2015-10-16 | 2018-03-27 | Roller Bearing Company Of America, Inc. | Spheroidial joint for column support in a tuned mass damper system |
| CN108884653A (en) * | 2016-02-04 | 2018-11-23 | I·特奥保德利 | Ground |
| CN110439948A (en) * | 2019-09-02 | 2019-11-12 | 南京工业大学 | It is a kind of to reduce the floating damping device for putting bottom of article coefficient of friction |
-
1991
- 1991-06-13 CN CN 91103794 patent/CN1067700A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101769016A (en) * | 2010-03-09 | 2010-07-07 | 张德新 | Anti-seismic device of building |
| CN101769016B (en) * | 2010-03-09 | 2011-07-27 | 张德新 | Anti-seismic device of building |
| CN104032766A (en) * | 2014-05-16 | 2014-09-10 | 同济大学 | LNG liquid storage tank shock insulation layer |
| US9926972B2 (en) | 2015-10-16 | 2018-03-27 | Roller Bearing Company Of America, Inc. | Spheroidial joint for column support in a tuned mass damper system |
| CN108884653A (en) * | 2016-02-04 | 2018-11-23 | I·特奥保德利 | Ground |
| CN108884653B (en) * | 2016-02-04 | 2021-10-29 | I·特奥保德利 | Foundation |
| CN110439948A (en) * | 2019-09-02 | 2019-11-12 | 南京工业大学 | It is a kind of to reduce the floating damping device for putting bottom of article coefficient of friction |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Koh et al. | A simple mechanical model for elastomeric bearings used in base isolation | |
| JP3646926B2 (en) | Earthquake countermeasures that support buildings and objects with a long-period virtual pendulum | |
| Constantinou et al. | NCEER-Taisei Corporation research program on sliding seismic isolation systems for bridges: experimental and analytical study of a friction pendulum system (FPS) | |
| Malhotra | Practical nonlinear seismic analysis of tanks | |
| Ambrose | Building structures | |
| Nanda et al. | Suitable friction sliding materials for base isolation of masonry buildings | |
| Tokimatsu et al. | Simplified procedures for the evaluation of settlements in clean sands | |
| Tsopelas et al. | NCEER-Taisei corporation research program on sliding seismic isolation systems for bridges: experimental and analytical study of a system consisting of sliding bearings and fluid restoring force/damping devices | |
| CN1067700A (en) | PTFE damping box on the building foundation | |
| Tsiavos et al. | Experimental investigation of a highly efficient, low-cost PVC-Rollers Sandwich (PVC-RS) seismic isolation | |
| Subramani et al. | Earthquake analysis of structure by base isolation technique in SAP | |
| Robinson | Seismic isolation of civil buildings in New Zealand | |
| CN1560395A (en) | Three-dimemsional vibration insulationg system | |
| Ertürk et al. | Seismic damage assessment based on site observation following the Düzce (Gölyaka) earthquake (Mw= 5.9, November 23, 2022) | |
| Tyler | Rubber bearings in base-isolated structures: A summary paper | |
| CN2688786Y (en) | Three-dimensional shock isolative seats | |
| Pall et al. | Seismic response of a friction-base-isolated house in Montreal | |
| Chikhi et al. | Dynamic buckling of cylindrical storage tanks during earthquake excitations | |
| Kerileng et al. | Base Isolation Systems in Multi-Storey Structures | |
| Erdoğan et al. | Seismic protection strategies for damage mitigation in structures | |
| Wang et al. | Finite Element Analysis of Dynamic Time History of Steel Frame Structure Filled with Rubber Brick | |
| Benfer et al. | San Fernando, California, Earthquake of February 9, 1971: Effects on building structures. 2 v | |
| Skinner et al. | Steel beam dampers for increasing the earthquake resistance of structures | |
| Maneetes | Development of a seismic dissipating mechanism for precast concrete cladding panels | |
| Khan et al. | Dynamic behaviour of interlocking plastic-block structure using Shake Table |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C01 | Deemed withdrawal of patent application (patent law 1993) | ||
| WD01 | Invention patent application deemed withdrawn after publication |