CN113944251B

CN113944251B - Earthquake isolation structure

Info

Publication number: CN113944251B
Application number: CN202010694797.5A
Authority: CN
Inventors: 张彪; 曹玮
Original assignee: Sichuan Yihill Technology Co ltd
Current assignee: Mingyixuan Technology Development Chengdu Co ltd
Priority date: 2020-07-18
Filing date: 2020-07-18
Publication date: 2023-01-24
Anticipated expiration: 2040-07-18
Also published as: CN113944251A

Abstract

The application relates to a novel earthquake isolation structure which comprises a periodic structure, wherein the periodic structure comprises a plurality of mass blocks, and the mass blocks are overlapped in the direction vertical to the ground; each mass block comprises an outer mass body and an inner mass body, the inner mass body is positioned in the outer mass body, and an elastic piece used for connecting the inner mass body and the outer mass body is arranged between the inner mass body and the outer mass body; an elastic structure is arranged between the two adjacent mass blocks and is used for connecting the two adjacent mass blocks.

Description

Earthquake isolation structure

Technical Field

The application relates to the field of earthquake isolation technology of buildings and structures, in particular to a novel earthquake isolation structure.

Background

Earthquake is a natural phenomenon which can not be avoided in human society, and 90% or more of casualties and economic losses caused by earthquake are caused by building collapse. Therefore, all countries in the world are dedicated to doing engineering earthquake resistance and disaster reduction work, improving the earthquake fortification level of construction engineering and improving the earthquake resistance of the construction engineering.

The use of periodic structures in seismic isolation has been extensively studied over the past few years. Experiments and theories show that the finely designed periodic structure can be effectively used for seismic isolation. The existing periodic seismic isolation structure technology generally considers that seismic waves of a certain frequency band are attenuated in an XY plane (in a plane parallel to the ground), so that the seismic waves of the frequency band are prevented from being transmitted to a building main body, and the seismic isolation purpose is achieved; other related art solves the seismic isolation problem involving the vertical (Z direction) by a 3D periodic structure. In these 3D structures, the periodicity is present in all three directions (X, Y and Z directions), and in practical applications, we need a simple, direct and efficient periodic structure that can concentrate on the seismic isolation effect in the Z direction (vertical to the ground).

Disclosure of Invention

The application provides a novel earthquake isolation structure for isolation. For convenience of description, the term "building" as used in this application encompasses "structure" unless otherwise indicated.

The application provides a novel earthquake isolation structure adopts following technical scheme:

a novel seismic isolation structure comprises a periodic structure, wherein the periodic structure comprises a plurality of mass blocks, and the mass blocks are overlapped along the direction vertical to the ground;

each mass block comprises an outer mass body and an inner mass body, the inner mass body is positioned in the outer mass body, and an elastic piece used for connecting the inner mass body and the outer mass body is arranged between the inner mass body and the outer mass body;

an elastic structure is arranged between two adjacent mass blocks and is used for connecting the two adjacent mass blocks;

the mass block and the elastic structure form a one-dimensional resonant mass chain in the direction vertical to the ground;

eigenfrequency of the inner massf _m Is the eigenfrequency of the one-dimensional resonant mass chainf ₀ More than 1.2 times of the size.

Preferably, the inner mass body is provided with at least one.

Preferably, the outer mass body comprises a shell, a filling space is arranged in the shell, a filling block is arranged in the filling space, and the inner mass body is connected with the filling block through an elastic piece.

Preferably, the elastic member is one of a coil spring, rubber, or a plate spring.

Preferably, the elastic structure comprises a connecting spring, and two ends of the connecting spring are respectively connected with the two mass blocks.

Preferably, the elastic structure comprises a pillar, an elastic material body is arranged on the end part of the pillar, and the pillar is connected with the mass block through the elastic material body.

Preferably, the elastic material body is one of rubber, a coil spring, or a plate spring.

Preferably, two adjacent mass blocks are provided with a sliding layer on the opposite surfaces.

Preferably, a mechanical reinforcing layer is arranged between the sliding layer and the mass block.

Drawings

FIG. 1 is a schematic view of one embodiment of a periodic structure of the present application;

FIG. 2 is a schematic diagram of the present application showing the dispersion relationship of the periodic structure of FIG. 1;

FIG. 3 is a power map of an earthquake of the present application;

FIG. 4 is a block diagram of a building of the present application;

FIG. 5 is a schematic view of another embodiment of a periodic structure of the present application;

FIG. 6 is a schematic view of an embodiment of a proof mass in a periodic structure of the present application;

FIG. 7 is a schematic view of an embodiment of the present application showing an inner mass;

FIG. 8 is a schematic view of an embodiment of the present application showing an outer mass;

FIG. 9 is a schematic view of another embodiment of a proof mass in a periodic structure of the present application; (ii) a

FIG. 10 is a schematic view of one embodiment of a spring structure used in the present application;

FIG. 11 is a schematic view of another embodiment of a flexible structure used in the present application;

FIG. 12 is a schematic view of other embodiments of the present application for showing a resilient structure;

FIG. 13 is a schematic view of other embodiments of the present application for showing a resilient structure;

FIG. 14 is a schematic diagram of an embodiment of the present application showing lossless relative motion between adjacent masses;

FIG. 15 is a schematic diagram of an embodiment of the present application for demonstrating lossless relative motion between adjacent masses

FIG. 16 is a schematic diagram of an embodiment of the present application for demonstrating lossless relative motion between adjacent masses;

FIG. 17 is a schematic diagram of an embodiment of the present application showing the application of a periodic structure to a structure;

FIG. 18 is a schematic diagram of another embodiment of the present application for illustrating the application of a periodic structure to a structure;

FIG. 19 is a schematic diagram of an embodiment of the present application showing the application of a plurality of different periodic structures to a structure;

FIG. 20 is a schematic diagram of another embodiment of the present application showing the application of a plurality of different periodic structures to a structure.

Description of reference numerals: 1. a periodic structure; 11. a mass block; 111. an outer mass; 1111. a housing; 1112. filling the space; 1113. filling blocks; 112. an inner mass body; 113. an elastic member; 12. an elastic structure; 121. a connecting spring; 122. a pillar; 123. a body of resilient material; 1231. a coil spring; 124. a body of rigid material; 13. a sliding layer; 131. a mechanical reinforcement layer; 2. a shock insulation support; 3. a building; 31. a support column; 32. a building unit; 4. a first isolation structure; 5. and a second isolation structure.

Detailed Description

The present application is described in further detail below with reference to figures 1-20.

Those skilled in the art will appreciate that the following examples and corresponding descriptions are selected for purposes of illustration and are not to be construed as limiting the invention. Other variations within the scope of the invention are also encompassed by the invention.

The embodiment of the application discloses novel earthquake isolation structure.

The seismic isolation structure disclosed herein has periodicity in a direction perpendicular to ground, while the periodic structure has a dispersion relationship in a direction perpendicular to ground, the dispersion relationship including an acoustic branch and an optical branch, the optical branch and the acoustic branch defining a bandgap (i.e., a frequency gap). The frequency gap is a frequency region that can be selected to correspond to a particular power region in the seismic power spectrum. The frequency gap may also be selected to correspond to a primary vibration frequency of a protected structure 3.

The periodic structure 1 includes a plurality of mass blocks 11, the plurality of mass blocks 11 are stacked in a direction perpendicular to the ground, each mass block 11 includes an outer mass body 111 and an inner mass body 112 located inside the outer mass body 111, the inner mass body 112 and the outer mass body 111 are elastically connected through an elastic member 113, the inner mass body 112 can be replaced by a plurality of mass bodies, and the plurality of inner mass bodies 112 are elastically connected with each other to form a two-dimensional or one-dimensional elastic vibrator system, while the outer mass body 111 can be a single mass body or a composite mass, for example, the outer mass body 111 can be a housing made of a first material and includes one or more spaces therein, and a second material can selectively fill the spaces, thereby effectively adjusting the resonant frequency.

The elastic member 113 is one of a coil spring, rubber, or a plate spring, and the coil spring can more conveniently realize a required elastic coefficient with respect to rubber, and can also more effectively realize performances such as fire prevention, high temperature (low temperature) resistance, temperature impact resistance, fatigue resistance, and the like.

Ideally, no loss of relative motion (e.g., no friction) is desired between adjacent masses 11 when viewed in a direction perpendicular to the ground, and in practice, it is desirable to minimize the friction between adjacent masses 11, and for this purpose, a sliding layer 13 may be used between adjacent masses 11, and such sliding layer 13 may be teflon or the like.

The periodic structure 1 may be located between the support column 31 and the foundation of the building 3, or may be used together with other seismic isolation mounts 2 such as rubber seismic isolation pads, or may place a plurality of periodic structures 1 having different main frequencies at different positions of the building 3.

Referring to fig. 1, fig. 1 schematically illustrates a periodic structure 1 according to the present application, where the periodic structure 1 includes a plurality of mass blocks 11, the mass blocks 11 are elastically connected to each other through elastic structures 12, each mass block 11 includes an outer mass body 111 and an inner mass body 112, the inner mass body 112 is connected to the outer mass body 111 through an elastic member 113, and the mass blocks 11, the outer mass body 111 of the mass blocks 11, the inner mass body 112, the elastic member 113 between the outer mass body 111 and the outer mass body 111, and the elastic structures 12 between the mass blocks 11 together form a seismic isolation structure with local resonance.

Those skilled in the art will appreciate that the configuration of FIG. 1 is for illustrative purposes only and that other variations within the scope of the present application are applicable; for example, the periodic structure 1 may have any suitable number of masses 11, and may be two or more, or three or more, or four or more. Each mass 11 may contain one or more internal masses, as will be discussed in more detail in later sections.

The basic principle of the periodic structure 1 shown in fig. 1 can be summarized as follows:

without damping, the periodic structure 1 is a conservative system, which can be described mathematically as:

8230and (formula 1).

Wherein,m _i is the mass of the inner mass 112,m _e is the mass of the outer mass 111,k _i which is an internal elastic coefficient, is determined by the elastic member 113,k _e as an external elastic coefficient, determined by the elastic structure 12,u _i is the displacement of the inner mass 112,u _e for displacement of the outer mass 111, superscriptjAnd（j+1）are respectively the firstjIs first and second（j+1）The mass block 11 is provided with a plurality of elastic elements,E _k 、V _p andErespectively kinetic energy, potential energy and total energy of a particular mass 11.

Since the whole system is a conservative system, it is possible to obtain

8230The formula 2.

Combining

equations

1 and 2, the following equation 3 can be obtained:

8230The formula 3.

According to Bloch theory, the general solution of equation 3 can be written as:

8230and (formula 4).

WhereinqIs the wave number of the wave, and,Lis the spatial constant (period in the direction perpendicular to the ground) of the mass block 11 in the periodic structure 1 of fig. 1.ωIs the angular frequency.B _i AndB _e related to the phase offset. In combination with equations 1 to 4, the dispersion relation of the periodic structure 1 of fig. 1 can be obtained. As shown in equation 5:

\8230; (equation 5).

Referring to fig. 2, for illustrative purposes, the dispersion relation of a periodic structure 1 is exemplarily shown in fig. 2; wherein the longitudinal axis is in [ Hz]Frequency is displayed in units of [ rad ] across]Wavenumber is shown in units, and the filled squares represent the optical branches of the dispersion relation; the open circles represent the acoustic branches of the dispersion relation, the optical and acoustic branches defining the band gap (frequency gap), in particular from the frequency at the acoustic branchf _ac At the beginning, to the frequency of the optical branchf _op Cut-off, frequencyf _ac Andf _op the frequency range therebetween is the band gap, the band gap width is Δf ₀ And are combined withf ₀ As a center, when the frequency of a vibration wave is in the band gapf _ac ，f _op ]Within this range, the vibration waves will be attenuated and cannot propagate in the periodic structure 1, and the energy carried by the vibration waves is therefore not transmitted into the periodic structure 1, which characteristic can be used for seismic isolation of the building 3.

For seismic isolation purposes, the periodic structure 1 in FIG. 1 can be designed such that its eigenfrequencies aref ₀ Having a suitable value (in a direction perpendicular to the ground) for the groundSeismic isolation, optionallyf ₀ Equal to or less than 50Hz, such as equal to or less than 30Hz, such as equal to or less than 20Hz, such as equal to or less than 10Hz, more preferably equal to or less than 5Hz, such as more preferably equal to or less than 3Hz, more preferably equal to or less than 1Hz; while the gap width deltaf ₀ According to the centre frequencyf ₀ Preferably of a larger value, to achieve isolation of more seismic frequency components, e.g. the band gap width Δf ₀ Has a value of 1Hz or more, 1.5Hz or more, 2Hz or more.

Referring to FIG. 3, in a seismic isolation embodiment, the periodic structure 1 of FIG. 1 may be designed such that its band gap corresponds to a frequency region corresponding to a region of seismic energy concentration, and FIG. 3 exemplarily illustrates a seismic energy frequency spectrum in which the peak of energy is located at about 7.6[ deg. ] Hz]Frequency of (2)f _p To (3). From 0[ 2 ] Hz]To 10Hz]The frequency region has the maximum accumulated energy, and when the frequency region is applied, the center frequency of the band gap of the seismic isolation structure can be enabled to bef ₀ (i.e., eigenfrequency) and peak frequency in the seismic energy spectrumf _p Aligning; gap width Δ ₀ With the frequency width Δ of the energy spectrumf _p Substantially aligned, with this arrangement, at a frequency of Δf _p The internal seismic waves are attenuated and cannot be transmitted in the periodic structure 1, and the energy carried by the seismic waves with the frequencies cannot be transmitted to the periodic structure 1, and when the seismic isolation structure is applied to the building 3, the energy of the seismic waves cannot be transmitted to the building 3 through the periodic structure 1, so that the purpose of isolating the seismic is achieved.

Referring to fig. 4, in some cases, the center frequency of the band gap of the periodic structure 1 in fig. 1 may also be designed to substantially coincide with one main vibration frequency of the building 3, such as one main vibration frequency of the building 3 in fig. 4f _b0 We can then design the seismic isolation structure of FIG. 1 such that the center frequency of its bandgap isf ₀ Is substantially equal tof _b0 This embodiment can effectively isolate building productsThe resonance seismic wave component is generated, so that the condition that the building 3 resonates in the earthquake is reduced, and the building 3 is protected.

The periodic structure 1 in fig. 1 can be implemented in various ways.

In one embodiment as shown in fig. 5, for simplicity and demonstration purposes, the periodic structure 1 in fig. 5 only shows two masses 11, each mass 11 comprising an inner mass 112 and an outer mass 111, the inner mass 112 being connected to the outer mass 111 by elastic members 113, it being noted that although two elastic members 113 are provided in this example, any suitable number of elastic members 113 may be provided, and the elastic members 113 may be any suitable elastic body, such as coil springs, rubber, leaf springs, etc.

The two masses 11 are connected by means of an elastic structure 12, in particular the elastic structure 12 is connected to the outer mass 111 of the two masses 11, it being noted that in this embodiment the two masses 11 can move relative to each other in a plane parallel to the ground, the inner mass 112 also moving relative to the outer mass 111 in a plane parallel to the ground; the elastic structure 12 defines an external elastic coefficient of the relative movement of the two masses 11 in a plane parallel to the ground, for which reason the elastic structure 12 between adjacent masses 11 may exhibit elasticity in a direction parallel to the ground and "inelasticity", such as stiffness, in a direction perpendicular to the ground. In other embodiments, the elastic structure 12 between adjacent masses 11 can exhibit elasticity both in a direction parallel to the ground and in a direction perpendicular to the ground, which is advantageous for preventing overturning of the target structure. Also with this configuration, inner mass 112 can vibrate within each individual mass 11, and masses 11 can vibrate relative to each other to form a resonance, it being noted that inner mass 112 can also vibrate in a plane parallel to the ground.

In order to make the eigen-frequency of the inner mass 112 of any one of the masses 11f _m Away from the center frequency of the band gapf ₀ The eigenfrequency of the inner mass 112f _m Set as the eigenfrequency of a one-dimensional resonant mass chainThe ratio is 1.2 times or more, 1.5 times or more, 1.7 times or more, 2.5 times or more, 3.5 times or more, 5.5 times or more, 10 times or more. In other embodiments, the eigen-frequency of the inner mass 112 of any one of the masses 11 is far from the main vibration frequency of the target building 3f _b0 Such as the eigen-frequency of the inner mass 112f _m Is the main vibration frequency of the building 3f _b0 1.2 times or more, 1.5 times or more, 2.5 times or more, 5.5 times or more, 10 times or more.

Referring to fig. 6, in order to meet the requirement of frequency, two or more inner masses 112 may be provided, and when two or more inner masses 112 are provided, two adjacent inner masses 112 are connected by an elastic member 113 to form an inner mass chain, the inner mass chain is connected to the outer mass 111 by the elastic member 113, and the inner mass chain may independently perform simple harmonic vibration in the mass 11, and the inner mass chain may be configured to vibrate in a direction perpendicular to the ground; also in some examples, the chain of masses may also form a two-dimensional array of inner masses, such that the chain of inner masses may also vibrate in a plane parallel to the ground.

Those skilled in the art will appreciate that an internal mass chain, or a two-dimensional array of internal masses, may have any suitable number of internal masses 112 depending on particular requirements, such as frequency matching. It is noted that in some embodiments, the eigen-frequency of the mass 112 within any one of the inner masses 11 of any one of the masses 11f _m Away from the center frequency of the band gap, e.g., the eigen-frequency of any of the inner masses 112f _m Is the centre frequency of the band gapf ₀ 1.2 times or more, 1.5 times or more, 2.5 times or more, 5.5 times or more, 10 times or more. In some embodiments, the eigen-frequency of mass 112 within any one of masses 11f _m The main vibration frequency far from the target building 3f _b Such as the eigen-frequency of the inner mass 112f _m Is a main vibration frequency of the target building 3f _b 1.2 times ofOr more than, 1.5 times or more than, 2.5 times or more than, 5.5 times or more than, 10 times or more than.

As described in the above formulas 1 to 5, referring to the periodic structure 1 in fig. 1, the periodic structure 1 may be a conservative system. In practical applications, when the inner mass 112 or inner mass chain vibrates with respect to the outer mass 111, friction may be generated due to the motion, resulting in energy loss. This problem can be reduced by providing a sliding layer 13. A typical material for the sliding layer 13 is teflon, which sliding layer 13 has a desired load-bearing capacity in a direction perpendicular to the ground surface while having a very small friction coefficient, for example 0.5 or less, 0.1 or less, 0.05 or less, 0.04 or less, in a direction parallel to the ground surface. In a specific implementation, such a sliding layer 13 can be applied on any surface that is in contact and has a relative motion.

Fig. 7 exemplarily shows an embodiment, and it can be seen from fig. 7 that the inner mass body 112 has upper and lower main surfaces, which move with the outer mass body 111 to generate friction during use. For this purpose, sliding layers 13 can be provided on both the upper and lower main surfaces, so that the movement friction is reduced.

In other embodiments, as shown in fig. 8, the outer mass 111 may also be provided with a sliding layer 13 on its major inner surface, and the outer mass 111 may have two major inner surfaces that may cause friction during operation (e.g., with the inner mass 112) and may be provided with a sliding layer 13.

It can be seen in equation 5 above that the dispersion relation and thus the bandgap depend on the mass of the inner mass 112m _i And the mass of the outer mass 111m _e And other parameters in a seismic isolation system such as internal and external spring rates. In order to achieve matching of the outer mass 111 and the inner mass 112 in practical applications, and thus to achieve a desired band gap and center frequency, the outer mass 111 may be implemented in various suitable geometries, such as a vessel containing an interior space.

In one embodiment as shown in fig. 9, the mass 11 includes an outer mass 111, an inner mass 112 and a resilient member 113 for connecting the outer mass 111 and the inner mass 112, the outer mass 111 includes a housing 1111, two filling spaces 1112 are provided in the housing 1111, the filling spaces 1112 are provided with filling blocks 1113, the filling blocks 1113 may be made of any suitable material to achieve the desired mass characteristics, the inner mass 112 is located between the filling blocks 1113 on both sides and connected with the filling blocks 1113 through the resilient member 113, the outer mass 111 may be made of steel material, such as Q235 steel material, and the filling blocks 1113 are made of concrete, rock, steel or any suitable material. It is noted that the inner mass 112 may be configured as a plurality of inner masses 112, and as described above, the inner masses 112 may be arranged in a one-dimensional or two-dimensional resonant array.

Two adjacent masses 11 are connected by an elastic structure 12, so that the masses 11 represent a simple harmonic oscillator system in the direction perpendicular to the ground, and the elastic structure 12 may be in any suitable form.

In one embodiment as shown in fig. 10, two adjacent masses 11 are connected by a connecting spring 121, and the connecting spring 121 enables the masses 11 to form the periodic structure 1 in the direction perpendicular to the ground and enables the masses 11 to move in a plane parallel to the ground without damage.

In another embodiment, shown in fig. 11, two adjacent masses 11 are connected by two struts 122, and the struts 122 are connected to the masses 11 by a body 123 of resilient material, which may be rubber, having a typical young's modulus of 1.2e6pa, thereby defining a spring constant.

Referring to fig. 12, in other embodiments, the ends of the struts 122 may be connected to the mass 11 by a body 123 of elastomeric material on one side and a body 124 of rigid material on the other side.

Referring to fig. 13, in other embodiments, a coil spring 1231 may be incorporated into the system, as in fig. 10, to provide that the coil spring 1231 supports 122 are connected to the mass 11, and the use of the coil spring 1231 is effective to achieve the desired elastic connection, while the coil spring 1231 is effective to resist high temperature, low temperature, and temperature shock, fire, material fatigue, etc. Here, the helical spring 1231 can also be exchanged for another spring, in particular a metal spring, such as a leaf spring.

As mentioned above, it is desirable in the periodic structure 1 to move relatively in a plane parallel to the ground with approximately no friction, or to minimize friction when moving relatively the masses 11 in a direction parallel to the ground, which can be facilitated by the use of the sliding layer 13.

In one embodiment, as shown in fig. 14, a sliding layer 13 is disposed between adjacent masses 11, the sliding layer 13 providing minimal friction movement between the adjacent masses 11, and the sliding layer 13 may be teflon or a material having a coefficient of friction of 1 or less, 0.5 or less, 0.1 or less, 0.05 or less, 0.04 or less.

Referring to fig. 15, in addition to placing the sliding layer 13 between the masses 11, the sliding layer 13 may also be coated or attached on the masses 11.

In some applications it may be desirable to use multiple masses 11 to protect the building 3.

Referring to fig. 16, in order to enable the mass 11 to move relatively while maintaining the vertical load capacity, a mechanical reinforcement layer 131 is disposed between the mass 11 and the sliding layer 13, and the mechanical reinforcement layer 131 may be made of steel or other materials.

The periodic structure 1 can be isolated in various ways.

Referring to fig. 17, as an example, a building 3 has two supporting columns 31, the two supporting columns 31 are fixed on two periodic structures 1 respectively, and the two periodic structures 1 are further fixed on the ground, wherein in an example in which the two periodic structures 1 have band gaps corresponding to specific seismic frequency regions, upon occurrence of an earthquake, seismic waves in the specific frequency regions will be significantly attenuated, and seismic energy carried is isolated outside the building 3, thereby protecting the building 3; in another example, the periodic structure 1 has a band gap corresponding to the main vibration frequency of the building 3, and resonance of the building 3 can be effectively avoided in the event of an earthquake.

Referring to fig. 18, the periodic structure 1 may be used with other seismic isolation devices 2, such as a rubber mount, which is placed on top of the periodic structure 1 and fixed on the periodic structure 1, a support column 31 of the building 3 is prevented on top of the rubber mount, and the periodic structure 1 is fixed on the ground, and the combination of the rubber mount and the periodic structure 1 further improves the seismic isolation performance of the building 3, and the periodic structure 1 may be configured to have a band gap corresponding to the energy power spectrum or the main vibration frequency of the building 3, which will not be repeated here.

Referring to fig. 19, in some applications, a building 3 may contain a plurality of building units 32, each corresponding to a different principal vibration frequency, for which we may provide a plurality of periodic structures 1 of different bandgaps, and in fig. 19, the building 3 includes a plurality of building units 32 vertically stacked, each building unit 32 having a principal vibration frequency different from the other building units 32, and therefore we provide a plurality of periodic structures 1, each periodic structure 1 being configured with a bandgap corresponding to the principal vibration frequency of each building unit 32, and the support pillars 31 of each building unit 32 being respectively located on the corresponding periodic structure 1.

Referring to fig. 20, the periodic structure 1 of the present application may be provided for use between foundations of a building 3, the periodic structures 1 may have the same or different bandgap characteristics, in fig. 18 there is provided a first isolation structure 4 and a second isolation structure 5, both the first isolation structure 4 and the second isolation structure 5 are composed of the periodic structure 1, the first isolation structure 4 and the second isolation structure 5 are placed between foundations and bottom foundations of the building 3, a load distribution layer may be provided between the building 3 and the periodic structure 1, wherein the first isolation structure 4 may have a bandgap corresponding to the seismic energy power spectrum so as to exclude the primary energy of an earthquake from the building 3, the second isolation structure 5 may have a bandgap corresponding to the primary vibration frequency of the building 3 so as to avoid earthquake induced resonances, it is noted that fig. 20 is for illustrative purposes only, other variations of fig. 20 are also applicable, for example, the same periodic structure 1 may be placed in adjacent structures, and in some applications, the periodic structure 1 having substantially the same bandgap may be used for the entire lower portion of the foundation.

Those skilled in the art will appreciate that the foregoing discussion is for the purpose of illustration, and that the examples presented above are some of many possible examples, and that other variations are possible. For example, some of the above embodiments are described in connection with buildings. Indeed, the invention is also applicable to structures or similar artificially constructed objects or structures. In some embodiments, the present invention relates to a structure that may be used as a building, or as a component of a building, or as a portion of a component. In the above description, some embodiments of the invention are used with support posts. Some embodiments of the invention may also be used between a wall or other vertical structural member of a building, structure or the like and a foundation, or between a foundation and a foundation, or between a vertical member and a horizontal member.

Reference throughout this specification to "one embodiment," "an example embodiment," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the purview of one skilled in the art to effect such feature, structure, or characteristic in connection with other ones of the embodiments. Moreover, for ease of understanding, some method steps are described as separate steps; however, the steps described separately should not be considered to necessarily have to be performed in a certain order. That is, some steps may be performed in another order at the same time. In addition, the exemplary diagrams illustrate various methods according to embodiments of the invention. Such exemplary method embodiments herein are described with and can be applied to corresponding apparatus embodiments. However, these method examples are not intended to limit the present invention.

Although a few embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the invention. The foregoing embodiments are, therefore, to be considered in all respects illustrative rather than limiting of the invention described herein. The scope of the invention is indicated by the appended claims rather than by the foregoing description. All changes which come within the meaning and range of equivalency of the specification are to be embraced within their scope. The term "preferably" as used in this specification is not exclusive and means "preferably but not limited to". The terms in the claims, consistent with the general concepts of the invention as described in the specification, should be interpreted in their broadest scope. For example, the terms "connected" and "coupled" (and derivatives thereof) mean directly and indirectly connected/coupled, as another example, "having" and "including" and derivatives thereof and variants or phrases are intended to have the same meaning as "comprising" (i.e., both are open "terms) -the only phrases" consisting of 8230that makes up "and" consisting essentially of 8230that makes up "should be considered" closed "unless the phrase" means "and the associated function appears in a claim and that such claim does not describe sufficient structure to perform that function.

Claims

1. An earthquake isolation structure is characterized in that:

comprising a periodic structure (1), the periodic structure (1) comprising a plurality of masses (11), the masses (11) being stacked in a direction perpendicular to the ground;

each mass block (11) comprises an outer mass body (111) and an inner mass body (112), the inner mass body (112) is located in the outer mass body (111), and an elastic piece (113) used for connecting the inner mass body (112) and the outer mass body (111) is arranged between the inner mass body (112) and the outer mass body (111);

an elastic structure (12) is arranged between two adjacent mass blocks (11), and the elastic structure (12) is used for connecting the two adjacent mass blocks (11);

the mass block (11) and the elastic structure (12) form a one-dimensional resonant mass chain in the direction vertical to the ground;

eigenfrequency of the inner mass (112)f _m Is the eigenfrequency of the one-dimensional resonant mass chainf ₀ More than 1.2 times of the size.

2. A seismic isolation structure as claimed in claim 1, wherein: at least one inner mass body (112) is arranged.

3. A seismic isolation structure as claimed in claim 1, wherein: the outer mass body (111) comprises a shell (1111), a filling space (1112) is arranged in the shell (1111), a filling block (1113) is arranged in the filling space (1112), and the inner mass body (112) is connected with the filling block (1113) through an elastic piece (113).

4. A seismic isolation structure as claimed in claim 1, wherein: the elastic member (113) is one of a coil spring, rubber, or a plate spring.

5. A seismic isolation structure as claimed in claim 1, wherein: the elastic structure (12) comprises a connecting spring (121), and two ends of the connecting spring (121) are respectively connected with the two mass blocks (11).

6. A seismic isolation structure as claimed in claim 1, wherein: the elastic structure (12) comprises a support pillar (122), an elastic material body (123) is arranged at the end part of the support pillar (122), and the support pillar (122) is connected with the mass block (11) through the elastic material body (123).

7. A seismic isolation structure as claimed in claim 6, wherein: the elastic material body (123) is one of rubber, a spiral spring (1231) or a plate spring.

8. A seismic isolation structure as claimed in claim 1, wherein: and sliding layers (13) are arranged on the opposite surfaces of the two adjacent mass blocks (11).

9. A seismic isolation structure as claimed in claim 8, wherein: a mechanical reinforcing layer (131) is arranged between the sliding layer (13) and the mass block (11).