CN114896867B - Shock insulation structure and design method thereof - Google Patents

Abstract

The invention discloses a shock insulation structure, in particular to the technical field of civil engineering shock insulation, which comprises a concrete box, a concrete cap, a low-rigidity rubber bearing, a steel cylinder and a metamaterial enveloping layer, wherein the concrete box is of a four-side hollow square column structure, the concrete cap comprises two cube flat plates which are arranged up and down and have the same shape, the low-rigidity rubber bearing is positioned between the steel cylinder and the concrete cap, the diameter of the steel cylinder is the same as that of the low-rigidity rubber bearing, the metamaterial enveloping layer is uniformly wrapped on the side surface of the steel cylinder, and the metamaterial enveloping layer is made of a negative poisson ratio material. The invention discloses a negative poisson ratio local resonance type resonator which is formed by periodically arranging the negative poisson ratio local resonance type resonator by utilizing the characteristics of good damping and energy absorption of a negative poisson ratio metamaterial and the characteristic of realizing low-frequency vibration isolation of a local resonance type earthquake metamaterial.

Description

A seismic isolation structure and design method thereof

technical field

The invention relates to the technical field of earthquake isolation in civil engineering, and more specifically, the invention relates to an earthquake isolation structure and a design method thereof.

Background technique

The ability of earthquakes is carried by seismic waves, and its frequency ranges from 0.1-20Hz, while traditional isolation barriers are difficult to achieve isolation of low-frequency seismic waves.

In order to solve the problem that traditional seismic isolation barriers are difficult to isolate low-frequency seismic waves, the present invention combines the characteristics of negative Poisson's ratio metamaterials with good damping and energy absorption characteristics and local resonance seismic metamaterials to achieve low-frequency seismic isolation, and invents a new The seismic metamaterial energy dissipator is combined with a new type of seismic metamaterial energy dissipator to form a shock isolation barrier capable of realizing an ultra-low frequency band gap. Based on the deep learning method, the reverse design method of the seismic isolation barrier of the present invention is realized by analyzing the specific engineering seismic isolation band gap requirements. The invention can realize the isolation of ultra-low frequency seismic waves in the field of engineering seismic isolation, and at the same time, the proposed design method can improve the pertinence and efficiency of seismic isolation barrier design for specific projects.

Contents of the invention

In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a seismic isolation structure and its design method, which can be realized by using negative Poisson’s ratio metamaterials with good damping and energy absorption characteristics and local resonance seismic metamaterials. Due to the characteristics of low-frequency isolation, a negative Poisson's ratio local resonance resonator was invented, and it was periodically arranged to form a seismic metamaterial isolation barrier. The isolation barrier can obtain a low-frequency band gap and realize the isolation of low-frequency seismic waves. To solve the problems raised in the background technology above.

To achieve the above object, the present invention provides the following technical solutions: a shock-isolation structure, including a concrete box, a concrete cap, a low-rigidity rubber bearing, a steel cylinder and a metamaterial envelope.

In a preferred embodiment, the concrete box is a four-sided hollow square column structure, and the top and bottom of the concrete box are reserved with back-shaped platform grooves. The four-sided hollow square column structure is composed of four rectangular flat plates with the same shape. According to the connection of the long sides, the rectangular slab is made of concrete pouring, and its total mass is used as the main design parameter to protect the negative Poisson’s ratio local resonance resonator. The concrete box affects the isolation efficiency of the isolation unit. The above design parameters are determined by the inverse design method of the seismic barrier.

In a preferred embodiment, the concrete cap includes two cubic slabs arranged up and down and of the same shape. The cube slabs are poured from concrete. The dimensions are the same, and the size of the cube plate located below is the same as the size of the back-shaped platform groove reserved at the bottom of the concrete box. The concrete box and the concrete cap form a whole, and its mass is used as a design parameter to affect the frequency band gap of the seismic isolation barrier. The width and scope are determined by the reverse design method of the seismic isolation barrier.

In a preferred embodiment, the low-stiffness rubber bearing is two low-stiffness elastic rubber blocks in the form of cylinders, the low-stiffness rubber bearing is located between the steel cylinder and the concrete cap, and the concrete cap and the steel cylinder The body is connected by a low-stiffness rubber bearing to adjust the natural resonance frequency of the negative Poisson's ratio local resonance type resonator.

In a preferred embodiment, the diameter of the steel cylinder is the same as that of the low-stiffness rubber bearing, and the top and bottom surfaces of the steel cylinder are respectively connected to the low-stiffness rubber bearings at the upper and lower ends, which act as a negative Poisson's ratio local resonance The effective mass of the type resonator can adjust the upper and lower limits of the frequency band gap.

In a preferred embodiment, the metamaterial envelope is evenly wrapped on the side of the steel cylinder, and the metamaterial envelope is made of a negative Poisson's ratio material, and the negative Poisson's ratio material has better energy absorption and The damping characteristic can play the role of increasing the damping and energy absorption of the local resonator. The elastic modulus, negative Poisson's ratio and mass density of the metamaterial itself are used as the design parameters of the seismic isolation unit, which can be determined by the reverse design method based on the deep neural reverse design method according to the actual engineering.

In a preferred embodiment, it also includes an adversarial deep neural network reverse design method, including a parameter decoder and an adversarial deep learning reverse design method, which can calculate the required design for the target frequency band gap in actual engineering parameters to realize the precise reverse design of each parameter of the new seismic isolation barrier.

In a preferred embodiment, the parameter decoder is a linear or nonlinear mapping between the design parameters of the seismic barrier and its attenuation domain bandgap, and can decode the design parameters into the seismic isolation bandgap frequency, which can be specifically expressed as an equation model mapping Or machine learning model mapping. This mapping consists of statistical empirical formulas for large amounts of data or classifiers or perceptrons for machine learning models.

In a preferred embodiment, the adversarial deep learning reverse design method includes an adversarial deep learning model, the input layer is the target design bandgap, the middle layer is the output model parameter, and the discriminator is a parameter decoder. Under the supervision of a high-precision parameter decoder, the adversarial deep learning reverse design method can more accurately generate the design parameters of the seismic barrier with the target band gap. Under the supervision of a higher-precision parameter decoder, the adversarial deep learning reverse design method can be more accurate Accurately generate seismic isolation barrier design parameters for the target bandgap.

Technical effect and advantage of the present invention:

1. Through the seismic isolation structure and design method designed by the present invention, compared with the prior art, the use of negative Poisson's ratio metamaterials has good damping and energy absorption characteristics and local resonance seismic metamaterials can realize the characteristics of low frequency seismic isolation , invented a negative Poisson's ratio local resonance resonator, and arranged it periodically to form a seismic metamaterial isolation barrier, which can obtain a low-frequency band gap and realize the isolation of low-frequency seismic waves;

2. Establish an adversarial deep learning model based on the corresponding database, use the decoder as a supervisory module, and input the upper and lower limits of the band gap of the target attenuation domain into the deep learning model in combination with the ultra-low frequency target isolation requirements of the actual project, The output design parameters are decoded by the decoder, and the error compared with the target design parameters is used as the training error for supervised training. In this deep learning model, when the error converges to 0, the design parameter value of the specified frequency bandgap is obtained when the model converges, which is the same as Compared with the existing technology, the deep learning method is applied to the reverse design of the periodic metamaterial ultra-low frequency bandgap seismic isolation barrier. The adversarial deep learning model based on the high-precision pre-training parameter decoder can target the The seismic isolation band gap realizes the precise design of the seismic isolation band gap of the actual target engineering isolation frequency, and improves the efficiency of actual engineering design.

Description of drawings

Fig. 1 is the layout form schematic diagram of a kind of seismic isolation structure of the present invention;

Fig. 2 is the structural representation of a kind of seismic isolation structure of the present invention;

Fig. 3 is a schematic diagram of the deep learning model training process of the reverse design method of the seismic isolation structure of the present invention.

Fig. 4 is the large sample schematic diagram of the concrete cap in the seismic isolation structure of the present invention;

Fig. 5 is the split schematic diagram of concrete box and concrete cap in the seismic isolation structure of the present invention;

Fig. 6 is a schematic diagram of the dispersion curve of the isolation structure obtained through the deep learning model in Embodiment 1 of the present invention.

Reference signs are: 1. concrete box; 2. concrete cap; 3. low-rigidity rubber bearing; 4. steel cylinder; 5. supermaterial envelope.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Example 1

As a kind of seismic isolation structure shown in accompanying drawing 1-6, the vibration isolation structure in this embodiment is a new type of seismic metamaterial energy dissipator, specifically a negative Poisson's ratio local resonance type resonator, including a concrete box 1, a concrete cap 2. Low stiffness rubber bearing 3, steel cylinder 4 and metamaterial envelope 5.

The thickness of the concrete box 1 is 0.1m, the size of the concrete cap 2 is length: width: height = 1.7m: 1.7m: 0.3m, the cross-sectional radius of the low stiffness rubber bearing 3 and the steel cylinder 4 is r = 0.5 m, wherein the thickness of the low-stiffness rubber bearing 3 is _Tc is 0.1m, and the height of the steel cylinder 4 is 1.7m, and the thickness of the negative Poisson’s ratio material in the metamaterial envelope 5 wrapped on the steel cylinder 4 is _Tn is 0.1m, the negative Poisson's ratio material in this embodiment is shown in Figure 5.

The Poisson's ratio v, elastic modulus E, mass density ρ of the negative Poisson's ratio material, the total weight of the concrete box Mb and the spacing a and b of the new seismic metamaterial energy dissipator in the isolation barrier are used as design parameters.

Based on the above-mentioned reverse design method, first, an appropriate number of numerical analysis models are established by intersecting the selectable value ranges of each design parameter, and a database corresponding to different parameter values and the attenuation band gap of the seismic isolation barrier is obtained.

Based on the corresponding database construction described above, a decoder is constructed according to a certain mapping relationship. In this example, a neural network is used to train the decoder. Based on the database data input and training the neural network, a decoder can be obtained, which accepts the input of design parameters and returns the output of the isolation band gap.

An adversarial deep learning model is established based on the corresponding database, and the decoder is used as a supervisory module. Combined with the ultra-low frequency target isolation requirements of the actual project, the upper and lower limits of the band gap of the target attenuation domain are input into the deep learning model, and the output design The parameters are used to supervise the training of this deep learning model, and when the model converges, the design parameter values of the specified frequency bandgap are obtained. The structure of the deep learning model is shown in FIG. 3 .

Based on the adversarial deep learning model, input the target ultra-low frequency range of 3-6Hz in an actual project, and obtain the design parameters: Poisson's ratio v of negative Poisson's ratio material is -0.7, and elastic modulus E is 2.5×10 ⁴ pa , the mass density ρ is 120kg/m ³ , and the design parameters are adjusted by controlling the ratio of negative Poisson's ratio materials. The total weight M _b of the concrete box is 11kN, the distance between single-layer seismic isolation units is a=0.7m, and the distance between different layers of seismic-isolation units is b=0.5m.

Numerical simulation of the obtained design parameters is carried out, and the results are shown in Figure 6. Figure 6 is a numerical simulation of the seismic isolation barrier constructed by the new seismic metamaterial energy dissipator. Based on the adversarial deep learning network model, the Dispersion curves of new seismic metamaterial dissipators obtained through parametric scanning of material parameters and periodic array parameter settings.

Referring to Figure 6, the gray area is the seismic isolation bandgap of the new seismic metamaterial dissipator, and the range of the bandgap is 1.6-7.8Hz. The dotted line in the figure indicates the velocity of the shear wave, and the solid line indicates the velocity of the Rayleigh wave. Wave velocity, the left part of the solid line represents the range of surface waves harmful to buildings, and the right part represents the body wave. Usually the frequency of seismic waves is between 0.1-20Hz, so this structure can effectively attenuate ultra-low frequency seismic waves. According to the design parameters, the novel seismic metamaterial energy dissipator is periodically laid out. Referring to FIG. 1, a novel seismic metamaterial shock-isolation barrier of the present invention is formed, which shows that the present invention is very effective in attenuating low-frequency seismic waves.

Example 2

This embodiment provides another kind of seismic isolation structure. The vibration isolation structure in this embodiment is a new type of seismic metamaterial energy dissipator, specifically a negative Poisson's ratio local resonance type resonator, including a concrete box 1, a concrete cap 2, a low stiffness Rubber bearing 3, steel cylinder 4 and metamaterial envelope 5;

The hollow concrete box 1 is used to place all the internal components of the new seismic metamaterial energy dissipator; the concrete cap 2 is used for the upper and lower capping of the concrete box 1, and transmits the external vibration to the steel cylinder 4; the steel cylinder 4 is used to support the two A concrete cap 2; the low-stiffness rubber bearing 3 is used to connect the concrete cap 2 and the steel cylinder 4, and transmits the vibration effect and absorbs part of the seismic energy; the metamaterial envelope layer 5 adopts a negative Poisson's ratio material for absorption and damping Shock wave energy. The invention can improve the vibration isolation capability of ultra-low frequency seismic waves, and realizes the reverse design of the vibration isolation barrier based on the reverse design method aiming at the actual band gap requirement.

The working principle of the present invention: when the seismic wave propagates into the seismic isolation barrier, the band gap in the attenuation domain is 1.6-7.8 Hz, including most of the ultra-low frequency seismic waves, and the surface wave is absorbed by the seismic isolation barrier or converted into The body wave propagating downwards realizes the ability to attenuate low-frequency seismic waves. The working principle of the reverse design method is to use the deep learning method to fit the corresponding relationship database based on the corresponding relationship between each parameter and the output bandgap obtained by numerical simulation, and realize the function of inputting the target frequency bandgap and outputting the design parameters.

In summary, the present invention provides a new type of seismic metamaterial isolation barrier and its reverse design method, which can generate an ultra-wide low-frequency band gap when an earthquake occurs, effectively suppress low-frequency resonance phenomena, and then achieve the purpose of attenuating low-frequency seismic waves. At the same time, it realizes the ability to quickly complete the parameter design of the seismic isolation barrier for different working conditions.

The last few points should be explained: First, in the description of this application, it should be explained that, unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, which can be mechanical connection Or electrical connection, it can also be the internal communication of two components, it can be directly connected, "up", "down", "left", "right", etc. are only used to indicate the relative positional relationship, when the absolute position of the object being described Change, the relative positional relationship may change;

Secondly: in the drawings of the disclosed embodiments of the present invention, only the structures related to the disclosed embodiments are involved, other structures can refer to the usual design, and the same embodiment and different embodiments of the present invention can be combined with each other if there is no conflict;

Finally: the above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the present invention within the scope of protection.

Claims (4)

1. A shock-isolation structure, characterized in that: comprise a concrete box (1), a concrete cap (2), a low-rigidity rubber bearing (3), a steel cylinder (4) and a metamaterial envelope (5); The concrete box (1) is a four-sided hollow square column structure, and the top and bottom of the concrete box (1) all reserve a back-shaped platform groove. The four-sided hollow square column structure is composed of four rectangular flat plates with the same shape according to the length The sides are connected, and the rectangular slab is made of concrete; The concrete cap (2) includes two cubic flat plates arranged up and down and of the same shape, the cubic flat plates are formed by pouring concrete, and the size of the upper cubic flat plate is the same as that of the reserved back-shaped platform groove on the top of the concrete box (1) , the size of the cube plate located below is the same as the size of the back-shaped platform groove reserved at the bottom of the concrete box (1), and the concrete box (1) and the concrete cap (2) form an integral body; The low rigidity rubber bearing (3) is a low rigidity elastic rubber block in the form of two cylinders, the low rigidity rubber bearing (3) is located between the steel cylinder and the concrete cap, the concrete cap (2) and the steel cap The cylinder (4) is connected by a low-rigidity rubber bearing (3); The diameter of the steel cylinder (4) is the same as that of the low stiffness rubber bearing (3), and the top and bottom surfaces of the steel cylinder (4) are respectively connected to the low stiffness rubber bearings (3) at the upper and lower ends; The metamaterial envelope (5) is evenly wrapped on the side of the steel cylinder (4), and the metamaterial envelope (5) is made of negative Poisson's ratio material. 2. A kind of seismic isolation structure according to claim 1, characterized in that: it also includes a reverse design method of adversarial deep neural network, including a parameter decoder and a reverse design method of adversarial deep learning. 3. The reverse design method of a confrontational deep neural network according to claim 2, characterized in that: the parameter decoder is a linear or nonlinear mapping between the design parameters of the seismic barrier and its attenuation domain band gap. 4. a kind of confrontational deep neural network reverse design method according to claim 3, is characterized in that: described confrontational deep learning reverse design method comprises confrontational deep learning model, and its input layer is the target design bandgap upper and lower limits , the middle layer is the design parameter of the vibration isolation barrier, and the discriminator is the parameter decoder.

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