CN114319625A - Shock isolation device for resisting earthquake in rare occurrence and building shock isolation method - Google Patents
Shock isolation device for resisting earthquake in rare occurrence and building shock isolation method Download PDFInfo
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Abstract
The invention relates to the technical field of anti-seismic equipment, and provides a shock isolation device for resisting a rare earthquake and a building shock isolation method, wherein the shock isolation device for resisting the rare earthquake comprises a sliding component and a shock isolation support, and the sliding component comprises a substrate and a sliding panel; the shock insulation support comprises a support body and a lower connecting plate arranged at the bottom of the support body, and the lower connecting plate is arranged on the sliding panel and slides synchronously with the sliding panel. When an extremely rare earthquake occurs, the horizontal shearing force applied to the support main body of the shock insulation support is larger than the friction force between the sliding panel and the top of the substrate, the shock insulation support is connected with the sliding panel through the lower connecting plate and slides on the substrate, so that the horizontal shearing deformation of the shock insulation support can be limited to avoid shearing damage, the magnitude of the seismic force of the device resisting the extremely rare earthquake and transmitting to the upper structure is limited, and meanwhile, the shock insulation device resisting the extremely rare earthquake still has higher seismic energy dissipation capacity.
Description
Technical Field
The invention relates to the technical field of earthquake-proof equipment, and particularly provides a shock isolation device for resisting earthquake which is extremely rare and a building shock isolation method.
Background
For a basic shock insulation structure, a Lead Rubber shock insulation support (LRB) system is the most widely used basic shock insulation system at home and abroad at present. The inventor preliminarily discusses the seismic response characteristics under the action of extremely rare earthquakes for a basic shock insulation structure (hereinafter referred to as LRB basic shock insulation structure) adopting an LRB shock insulation system, and researches show that: 1) when the foundation isolation structure is subjected to an overlarge earthquake (extremely rare earthquake), compared with the traditional base fixing structure, the insecurity that the damage of the upper structure is increased sharply exists; 2) although the design concept of reducing the seismic fortification intensity of the superstructure according to the existing GB50011-2010 building seismic design Specification does not fundamentally influence the seismic performance of the LRB basic seismic isolation structure under the effects of fortification and rare earthquakes, the adoption of a design mode of reducing the seismic fortification intensity on the superstructure is not advisable under the effect of rare earthquakes; 3) how to ensure good earthquake resistance of a basic earthquake-proof structure under the action of fortification and rare earthquakes and safety performance under the action of extremely rare earthquakes is a challenging problem.
The LRB basic isolation structure has the phenomenon that the damage of the upper structure is rapidly increased when the LRB basic isolation structure is subjected to the action of an earthquake rarely, and the reason can be explained from a compression-shear experiment curve of the lead core rubber isolation support under different shear strain loads. FIG. 1 shows a hysteresis curve of a lead rubber isolation bearing (LRB 300 isolation bearing for short) with the diameter of 300mm under the action of constant vertical compressive stress and under different shear strain loads. The total thickness of the rubber layers of the LRB300 seismic isolation support is 59.0 mm; the vertical compressive stress is 10.0 MPa; the horizontal loading frequency and the waveform are respectively 0.25Hz and sine wave; the horizontal load shear strain is 100%, 150%, 200%, 250%, 300%, 350% and 400% in this order (horizontal load shear strain is the ratio of the horizontal maximum load displacement to the total thickness of the rubber layer). As can be seen from fig. 1: with the increase of horizontal loading shear strain, the hardening phenomenon of the LRB300 shock insulation support is more obvious, and the corresponding maximum shear force of the support is increased; in addition, according to GB/T20688.1-2007 part 1 of rubber mount: the test method for the vibration isolation rubber support determines that under the condition of increasing horizontal loading shear strain, the corresponding horizontal equivalent damping ratio of the LRB300 vibration isolation support is greatly reduced (sequentially: 24.2%, 20.4%, 18.5%, 16.0%, 14.5%, 13.7% and 12.8%). Therefore, under the earthquake action of increasing strength of the LRB basic shock insulation structure, on one hand, the earthquake force transmitted to the upper structure is increased along with the increase of the maximum horizontal shear strain of the shock insulation support; on the other hand, the seismic energy dissipation capacity of the LRB isolation bearing is reduced due to the horizontal shear strain of the isolation bearing which is increased continuously. This is one of the reasons why the LRB base-isolated structure is not good in earthquake-resistant performance under the action of very rare earthquakes. In addition, the rubber shock insulation support is used as a key component of the whole basic shock insulation structure, and under the action of an extremely rare earthquake, the horizontal shear deformation of the rubber shock insulation support possibly exceeds the horizontal deformation capacity of the rubber shock insulation support, so that the basic shock insulation structure is damaged.
Disclosure of Invention
The invention aims to provide a shock isolation device for resisting an earthquake which is extremely rare, and aims to solve the problem that the existing shock isolation support cannot meet the shock isolation requirement under the earthquake which is extremely rare.
In order to achieve the purpose, the invention adopts the technical scheme that:
in a first aspect, the invention provides a seismic isolation device for resisting an extremely rare earthquake, which is used for isolating the earthquake under the extremely rare earthquake and comprises a sliding component and a seismic isolation support, wherein the sliding component comprises a substrate and a sliding panel arranged on the top of the substrate, and the sliding panel is used for overcoming the friction force and sliding on the top surface of the substrate; the shock insulation support is used for the deformation to consume energy in order to realize the shock attenuation, and the shock insulation support includes the support main part and locates the lower connecting plate of support main part bottom, and lower connecting plate sets up on the panel that slides and slides in step with the panel that slides.
The invention has the beneficial effects that: the shock insulation device for resisting the extremely rare earthquakes, provided by the invention, combines the sliding component with the shock insulation support for use, connects the lower connecting plate of the shock insulation support with the sliding panel of the sliding component, when the extremely rare earthquakes occur, the horizontal shearing force applied to the support main body of the shock insulation support is larger than the friction force between the sliding panel and the top of the substrate, and the support main body is connected to the sliding panel through the lower connecting plate and slides on the substrate, so that the horizontal shearing deformation of the support main body can be limited to avoid shearing damage, meanwhile, the magnitude of the earthquake force transmitted to the upper structure by the shock insulation device for resisting the extremely rare earthquakes is also limited, and meanwhile, the shock insulation device for resisting the extremely rare earthquakes still has higher earthquake energy dissipation capability; meanwhile, in rare earthquakes, the horizontal shearing force borne by the shock-isolating support is smaller than the friction force between the sliding panel and the top of the base, and the shock-isolating support cannot slide, so that the good shock resistance of the shock-isolating support under the fortification and rare earthquakes is inherited, and the requirement of multi-stage shock-resistant fortification is met.
In one embodiment, the base top is formed with a friction end forming a friction face toward one end side of a slip panel provided on the friction face and adapted to slide on the friction face against a friction force.
By adopting the technical scheme, the sliding panel is supported by the friction end part of the substrate, and the sliding panel is placed on the friction surface of the friction end part to generate friction force.
In one embodiment, the glide member is a glide isolation mount.
By adopting the technical scheme, the sliding part adopts the sliding shock insulation support to ensure the shock resistance under the condition of extremely rare earthquakes.
In one embodiment, the slip panel is a teflon panel.
By adopting the technical scheme, the sliding panel is made of the polytetrafluoroethylene panel so as to improve the friction force between the sliding panel and the friction end part.
In one embodiment, the isolation bearing is a lead rubber isolation bearing.
Through adopting foretell technical scheme, select lead core rubber shock insulation support for use with shock insulation support, utilize the good shock insulation effect of lead core rubber shock insulation support to promote the whole shock resistance who resists the shock insulation device that extremely rare meets the earthquake.
In one embodiment, the coefficient of friction f between the slip panel and the top surface of the substrateSLIs composed of
Wherein q isDIn order to resist the yield-weight ratio of the shock isolation device which is extremely rare to meet the earthquake, G is the rubber shear modulus of the lead core rubber shock isolation support, sigma is the vertical compressive stress of the lead core rubber shock isolation support, u is the vertical compressive stress of the lead core rubber shock isolation supportSLSliding displacement, T, of seismic isolation devices to resist very rare earthquakesRThe thickness of the rubber layer of the lead core rubber shock insulation support is shown.
By adopting the above technical solution, it can be known from the above formula of the friction coefficient that the friction coefficient can be determined according to the desired slip displacement.
In one embodiment, the isolation bearing is a rubber isolation bearing.
Through adopting foretell technical scheme, select rubber shock mount with the isolation bearing for use, utilize the shock insulation performance of rubber material to improve holistic shock resistance.
In a second aspect, the present invention provides a method of isolating seismic structures from buildings using an isolation apparatus as described above which is resistant to very rare earthquakes, the method comprising:
assembling to form a shock isolation device for resisting the extremely rare earthquakes, and arranging a shock isolation support on the sliding component so as to connect a lower connecting plate of the shock isolation support with a sliding panel of the sliding component;
the bottom of the building is provided with a shock isolation device for resisting earthquake which is extremely rare, the base of the sliding component is used for being connected with the foundation, and the support main body of the shock isolation support is used for being connected with the building.
The invention has the beneficial effects that: the building shock insulation method provided by the invention ensures that the shock insulation building can still have good shock resistance under the extremely rare earthquake on the basis of carrying out shock insulation by using the shock insulation device for resisting the extremely rare earthquake, and meets the requirement of multistage shock resistance fortification.
In one embodiment, the method further comprises: adjusting the coefficient of friction between the slip panel and the top surface of the substrate such that the slip panel slips in the event of a rare earthquake.
Through adopting foretell technical scheme, through adjusting the coefficient of friction between the top surface to the panel that slides and the basement for the shearing force that plumbous core rubber shock insulation support received under the earthquake of rare chance is greater than frictional force, and plumbous core rubber shock insulation support can slide on the friction surface, makes the shock insulation device who resists earthquake of rare chance still have good anti-seismic performance under the earthquake of rare chance.
In one embodiment, in the step of adjusting the coefficient of friction between the slip panel and the top surface of the substrate: the onset displacement is set to be the same as the maximum horizontal shear deformation of the seismic isolation device resisting the extremely rare earthquake under the action of the rare earthquake.
By adopting the technical scheme, the sliding displacement is set to be the same as the maximum horizontal shear deformation of the shock isolation device for resisting the extremely rare earthquake under the action of the rare earthquake, so that the shock resistance of the shock isolation device for resisting the extremely rare earthquake is better.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a hysteresis performance curve of a conventional lead core rubber vibration isolation support with the diameter of 300mm under different levels of shear strain;
FIG. 2 is a trilinear restorative force model of a seismic isolation apparatus against extreme rare earthquakes according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a seismic isolation device for resisting an extremely rare earthquake according to an embodiment of the invention.
Wherein, in the figures, the respective reference numerals:
100. shock isolation devices to resist very rare earthquakes; 10. a sliding member; 11. a substrate; 12. a slip panel; 13. rubbing the end; 131. a friction surface; 20. a shock insulation support; 21. a support body; 22. a lower connecting plate.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The lead rubber shock insulation support system is the most widely used basic shock insulation system at home and abroad at present, and has excellent shock insulation performance under rare bases. However, in the rare earthquake situation, the damage of the upper structure of the lead core rubber shock insulation support can be rapidly increased, so that under the earthquake action of increasing strength of the basic shock insulation structure of the lead core rubber shock insulation support, on one hand, the earthquake force transmitted to the upper structure is increased along with the increase of the maximum horizontal shear strain of the shock insulation support; on the other hand, the seismic energy dissipation capacity of the lead rubber isolation bearing is reduced due to the horizontal shear strain of the isolation bearing which is increased continuously. This is one of the reasons why the lead rubber vibration isolation support has poor anti-seismic performance under the action of very rare earthquakes. In addition, the rubber shock insulation support is used as a key component of the whole basic shock insulation structure, and under the action of an extremely rare earthquake, the horizontal shear deformation of the rubber shock insulation support possibly exceeds the horizontal deformation capacity of the rubber shock insulation support, so that the basic shock insulation structure is damaged.
Therefore, the invention provides a shock isolation device for resisting the extremely rare earthquake and a building shock isolation method, wherein the shock isolation device for resisting the extremely rare earthquake is used by connecting a lead rubber shock isolation support with a sliding shock isolation support in series, the lead rubber shock isolation support is arranged on a sliding panel of the sliding shock isolation support, when the extremely rare earthquake occurs, the shearing force applied to the lead rubber shock isolation support exceeds the friction force between the sliding panel and the friction end part of the sliding shock isolation support, so that the lead rubber shock isolation support synchronously slides the sliding panel to limit the horizontal shearing deformation of the shock isolation support so as to avoid shearing damage, and simultaneously, the magnitude of the seismic force transmitted to an upper structure by the shock isolation device for resisting the extremely rare earthquake is limited, and the shock isolation device for resisting the extremely rare earthquake still has stronger shock isolation effect under the extremely rare earthquake.
Referring to fig. 2 and 3, in a first aspect, the present invention provides a seismic isolation apparatus 100 for resisting a rare earthquake, which is used for isolating a seismic isolation under the rare earthquake, and includes a sliding component 10 and a seismic isolation support 20, wherein the sliding component 10 includes a base 11 and a sliding panel 12 disposed on the top of the base 11, and the sliding panel 12 is used for sliding on the top surface of the base 11 against a friction force; the vibration isolation support 20 is used for dissipating energy to achieve vibration absorption, the vibration isolation support 20 comprises a support main body 21 and a lower connecting plate 22 arranged at the bottom of the support main body 21, and the lower connecting plate 22 is arranged on the sliding panel 12 and slides synchronously with the sliding panel 12.
When an earthquake happens rarely, the support main body 21 of the vibration isolation support 20 is subjected to large shearing force, after the horizontal shearing force applied to the support main body 21 exceeds the friction force between the sliding panel 12 and the top of the substrate 11, the support main body 21 slides on the top of the substrate 11 through the lower connecting plate 22 and the connected sliding panel 12 to limit the horizontal shearing deformation of the vibration isolation support 20 so as to avoid shearing damage, and meanwhile, the sliding process of the sliding panel 12 on the top of the substrate 11 can also absorb a large amount of earthquake energy to achieve the vibration isolation effect. The support body 21 may be a damping block made of a material with a buffering property, such as rubber, silicone, etc., and a rubber damping block is preferred in this embodiment; alternatively, the support body can also adopt a damping block made of composite materials, such as a lead rubber support. The vibration isolation support 20 is used for vibration isolation during a defense earthquake and a rare earthquake, when the rare earthquake occurs, the shearing force applied to the support main body 21 is not enough to drive the support main body to be connected with the sliding panel 12 through the lower connecting plate 22 to slide on the substrate 11, and therefore the vibration absorption effect during the rare earthquake mainly depends on the deformation energy consumption and the vibration absorption of the support main body 21 of the vibration isolation support 20. Therefore, the shock isolation device 100 for resisting the extremely rare earthquake combines the advantages of the lead rubber support and the sliding shock isolation support, solves the problem that the lead rubber support cannot exert the shock resistance effect of temperature under the action of earthquakes with different intensities at the same time, and can meet the requirement of multistage shock resistance fortification.
According to the working principle of the seismic isolation device 100 for resisting the extremely rare earthquake, the mechanical analysis of the seismic isolation device 100 for resisting the extremely rare earthquake can be simplified into a trilinear restoring force model as shown in fig. 2. In FIG. 2, FIAnd uIRestoring force and horizontal deformation of the seismic isolation apparatus 100 against the extremely rare earthquakes, respectively; u. ofYAnd uSLRespectively the yield displacement and the skidding displacement of the shock isolation device 100 for resisting the extremely rare earthquake; qDAnd QSLRespectively, the yield force of the seismic isolation device 100 against the extremely rare earthquakes (Q since no relative sliding occurs at this timeDOr the yield force of the lead core rubber shock insulation support) and the slip force; k is a radical ofE、kIAnd kSLPre-yield elastic stiffness, post-yield stiffness and post-skid stiffness, respectively, of seismic isolation apparatus 100 against extremely rare earthquakes (generally assuming kSL0), wherein kEAnd kIThe elastic stiffness before yielding and the stiffness after yielding of the lead core rubber seismic isolation bearing can also be considered. Because the shock insulation device 100 for resisting the extremely rare earthquake essentially acts as a lead core rubber shock insulation support under the action of defense and the rare earthquake, the basic mechanical property parameters of the shock insulation device 100 for resisting the extremely rare earthquake can be defined based on the mechanical property parameters of the lead core rubber shock insulation support.
According to the shock isolation device 100 for resisting the extremely rare earthquakes, the sliding component 10 and the shock isolation support 20 are combined for use, the lower connecting plate 22 of the shock isolation support 20 is connected with the sliding panel 12 of the sliding component 10, when the extremely rare earthquakes occur, the shearing force applied to the support main body 21 of the shock isolation support 20 is larger than the friction force between the sliding panel 12 and the top of the substrate 11, and the support main body 21 is connected to the sliding panel 12 through the lower connecting plate 22 and slides on the substrate 11, so that the horizontal shearing deformation of the support main body can be limited to avoid shearing damage, the magnitude of the seismic force transmitted to an upper structure by the shock isolation device for resisting the extremely rare earthquakes is also limited, and meanwhile, the shock isolation device for resisting the extremely rare earthquakes still has high seismic energy dissipation capacity; meanwhile, in rare earthquakes, the horizontal shearing force applied to the shock-isolating support 20 is smaller than the friction force between the sliding panel 12 and the top of the base 11, and the shock-isolating support 20 cannot slide, so that the good shock resistance of the shock-isolating support 20 under the fortification and rare earthquakes is inherited, and the requirement of multi-stage shock-resistant fortification is met.
Referring to fig. 3, in an embodiment, a friction end 13 is formed on the top of the base 11, the friction end 13 forms a friction surface 131 toward one end side of the sliding panel 12, and the sliding panel 12 is disposed on the friction surface 131 and slides on the friction surface 131 against a friction force. The sliding panel 12 is arranged on the friction end part 13, the sliding panel 12 is supported by the friction surface 131, when an earthquake occurs, the sliding panel 12 has the tendency of relative movement with the friction end part 13, and the sliding panel 12 can slide only when the horizontal shearing force applied to the vibration isolation support 20 is greater than the friction force; namely, under the condition of extremely rare earthquakes, after the shock-isolating support 20 is subjected to excessive shearing force, the sliding panel 12 can slide, and at the moment, the shock-isolating support 20 is matched with the sliding component 10 to realize the shock-isolating effect.
Referring to fig. 3, in one embodiment, the sliding member 10 is a sliding isolation mount. The sliding component 10 adopts a sliding vibration isolation support to ensure the shock resistance under the condition of extremely rare earthquakes. When the horizontal shearing force applied to the vibration-isolating support 20 is greater than the friction force applied to the sliding panel 12, the vibration-isolating support 20 slides relatively along with the sliding panel 12, so that the degree of shearing deformation of the vibration-isolating support 20 is limited, deformation and damage are avoided, and the vibration-isolating effect under the condition of extremely rare earthquakes is ensured.
Referring to fig. 3, in one embodiment, the slip panel 12 is a teflon panel. The polytetrafluoroethylene plate (also called as a polytetrafluoroethylene plate, a teflon plate and a teflon plate) is divided into two types of die pressing and turning. The polytetrafluoroethylene plate has extremely excellent comprehensive properties: high and low temperature resistance (between minus 192 ℃ and 260 ℃), corrosion resistance (strong acid, strong alkali, aqua regia and the like), weather resistance, high insulation, high lubrication, no adhesion, no toxicity and the like. The polytetrafluoroethylene panel is used as the sliding panel 12, so that the service life of the sliding vibration isolation support can be ensured, and the comprehensive performance of the sliding vibration isolation support can be improved.
In one embodiment, the isolation mounts 20 are rubber isolation mounts. The vibration isolation support 20 is made of rubber, and the vibration isolation performance of the rubber is utilized to improve the overall vibration isolation capacity.
In one embodiment, the isolation mounts 20 are lead rubber isolation mounts. The lead rubber shock insulation support 20 is selected as the shock insulation support, and the good shock insulation effect of the lead rubber shock insulation support is utilized to improve the overall shock resistance of the shock insulation device 100 for resisting the earthquake which is rare. Lead rubber isolation bearing is preferred as isolation bearing 20 in this application.
Referring to fig. 2 and 3, in one embodiment, the coefficient of friction f between slip panel 12 and the top surface of base 11SLIs composed of
Wherein q isDIn order to resist the bending-weight ratio of the seismic isolation device 100 in the rare earthquake, G is the rubber shear modulus of the lead rubber seismic isolation support, sigma is the vertical compressive stress of the lead rubber seismic isolation support, uSLSlip-off displacement, T, of seismic isolation apparatus 100 to resist extremely rare earthquakesRThe thickness of the rubber layer of the lead core rubber shock insulation support is shown. As can be seen from the above formula of the friction coefficient, the friction coefficient can be determined according to the desired slip displacement. Wherein a slip-off displacement u is suggestedSLThe size of the shock insulation device 100 can be equal to the maximum horizontal shear deformation of the lead core rubber shock insulation support under the action of the extremely rare earthquake. When the specifications of the shock insulation devices 100 resisting the extremely rare earthquakes are uniform (namely the specifications of the lead rubber shock insulation supports are uniform), and the number of the shock insulation devices 100 resisting the extremely rare earthquakes is N, according to the literature 'shock insulation structure design', the period T of the shock insulation devices 100 resisting the extremely rare earthquakesIDiameter D of lead core rubber shock insulation support, rubber shear modulus G, vertical pressure sigma borne by support and total thickness T of inner rubber layerRAnd a second shape coefficient S2(i.e., diameter D and total thickness T of inner rubber layerRRatio of (d) there is the following relationship:
wherein g is the acceleration of gravity. For parameter QSLThen depends on the coefficient of friction f between the teflon plate and the friction end 13SLAnd the vertical pressure σ to which the support is subjected. According to resistance to very rare earthquakesThe working mechanism of the shock isolation device 100 is that the lead rubber shock isolation support does not slide in rare earthquakes, but slides in extreme rare earthquakes, so that the shock isolation device has the following components:
seismic isolation period T of seismic isolation apparatus 100 considering resistance to extremely rare earthquakesIRigidity k after yielding with lead core rubber shock insulation supportIThe following relationships exist:
wherein, W is the total weight borne by the seismic isolation device 100 resisting the extremely rare earthquakes, namely:
by combining the above formulas, the friction coefficient f can be obtainedSLIs described in (1).
In a second aspect, the present invention provides a method of isolating seismic structures using an isolation apparatus 100 as described above, which is resistant to very rare earthquakes, the method comprising:
assembling to form a shock isolation device 100 for resisting the extremely rare earthquake, arranging a shock isolation support 20 on the sliding component 10, and connecting a lower connecting plate 22 of the shock isolation support 20 with a sliding panel 12 of the sliding component 10;
the bottom of the building is provided with a shock insulation device 100 for resisting the extremely rare earthquakes, the base 11 of the sliding component 10 is used for being connected with a foundation, and the support body 21 of the shock insulation support 20 is used for being connected with the building.
By adopting the method to defend the extremely rare earthquake, when the extremely rare earthquake occurs, the support main body 21 of the shock-insulation support 20 firstly generates shearing deformation energy consumption to buffer earthquake impact, when the horizontal shearing force borne by the shock-insulation support 20 is greater than the friction force between the sliding panel 12 and the top of the substrate 11, the support main body 21 pushes the sliding panel 12 to overcome the friction force to slide through the lower connecting plate 22, so that the horizontal shearing deformation of the support main body 21 can be limited to avoid shearing damage, and the magnitude of the earthquake force which is transmitted to the upper structure by the shock-insulation device resisting the extremely rare earthquake is also limited, thereby absorbing a large amount of earthquake energy to realize the effect of buffering the earthquake impact.
The building shock insulation method provided by the invention ensures that the shock insulation building can still have good shock resistance under the extremely rare earthquake on the basis of carrying out shock insulation by using the shock insulation device 100 for resisting the extremely rare earthquake, and meets the requirement of multistage earthquake fortification.
In one embodiment, the method further comprises: the coefficient of friction between the slip panel 12 and the top surface of the substrate 11 is adjusted so that the slip panel 12 slips in the very rare earthquakes. Through adjusting the coefficient of friction between the top surface of the substrate 11 and the sliding panel 12, the shearing force applied to the lead rubber shock insulation support in the extremely rare earthquake is greater than the friction force, and the lead rubber shock insulation support can slide on the friction surface 131, so that the shock insulation device 100 for resisting the extremely rare earthquake still has good shock resistance in the extremely rare earthquake.
In one embodiment, in the step of adjusting the coefficient of friction between slip panel 12 and the top surface of base 11: the onset displacement is set to be the same as the maximum horizontal shear deformation of the seismic isolation apparatus 100 against the extremely rare earthquakes under the rare earthquakes. The maximum horizontal shear deformation of the shock isolation device 100 resisting the extremely rare earthquake under the rare earthquake is set to be the same as the maximum horizontal shear deformation of the shock isolation device 100 resisting the extremely rare earthquake, so that the shock resistance of the shock isolation device 100 resisting the extremely rare earthquake is better.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A seismic isolation apparatus resistant to extreme rare earthquakes for isolating seismic isolation in extreme rare earthquakes, comprising:
the sliding component comprises a substrate and a sliding panel arranged on the top of the substrate, and the sliding panel is used for overcoming the friction force to slide on the top surface of the substrate;
the shock insulation support is used for deforming and consuming energy to achieve shock absorption, comprises a support main body and a lower connecting plate arranged at the bottom of the support main body, and the lower connecting plate is arranged on the sliding panel and slides synchronously with the sliding panel.
2. Seismic isolation apparatus as claimed in claim 1 which is resistant to extreme rare earthquakes, wherein: the top of the base is formed with a friction end, the friction end forms a friction surface towards one end side of the sliding panel, and the sliding panel is arranged on the friction surface and is used for overcoming the friction force to slide on the friction surface.
3. Seismic isolation apparatus as claimed in claim 2 which is resistant to extreme rare earthquakes, wherein: the sliding component is a sliding vibration isolation support.
4. Seismic isolation apparatus as claimed in claim 2 which is resistant to extreme rare earthquakes, wherein: the sliding panel is a polytetrafluoroethylene panel.
5. A seismic isolation apparatus as claimed in claim 3 which is resistant to extreme rare earthquakes, wherein: the shock insulation support is a lead core rubber shock insulation support.
6. Seismic isolation apparatus as claimed in claim 5 which is resistant to extreme rare earthquakes, wherein: coefficient of friction f between the slip panel and the top surface of the substrateSLIs composed of
Wherein q isDIs said toThe yield-weight ratio of the shock isolation device for resisting the extremely rare earthquake is that G is the rubber shear modulus of the lead core rubber shock isolation support, sigma is the vertical compressive stress of the lead core rubber shock isolation support, and u is the vertical compressive stress of the lead core rubber shock isolation supportSLFor the sliding displacement, T, of the seismic isolation device against extremely rare earthquakesRThe thickness of the rubber layer of the lead core rubber shock insulation support is the thickness of the rubber layer of the lead core rubber shock insulation support.
7. Seismic isolation apparatus as claimed in any of claims 1 to 4 against extremely rare earthquakes, characterized in that: the shock insulation support is a rubber shock insulation support.
8. A method of seismic isolation in a building using a seismic isolation apparatus as claimed in any of claims 1 to 7 which is resistant to extremely rare earthquakes, the method comprising:
assembling to form a shock isolation device for resisting the extremely rare earthquake, and arranging a shock isolation support on the sliding component so as to connect a lower connecting plate of the shock isolation support with a sliding panel of the sliding component;
the bottom of the building is provided with a shock isolation device for resisting earthquake which is extremely rare, the base of the sliding component is used for being connected with a foundation, and the support main body of the shock isolation support is used for being connected with the building.
9. A method of isolating vibration from a building as in claim 8, further comprising:
adjusting a coefficient of friction between the slip panel and the top surface of the substrate such that the slip panel slips in the event of a rare earthquake.
10. A method of isolating vibration from a building according to claim 9, wherein in the step of adjusting the coefficient of friction between the slip panel and the top surface of the base: the sliding displacement is set to be the same as the maximum horizontal shear deformation of the shock isolation device resisting the extremely rare earthquake under the action of the rare earthquake.
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