Fabricated negative Poisson's ratio seismic wave barrier and design method thereof

Abstract

The invention discloses a fabricated negative Poisson's ratio seismic wave barrier and a design method thereof.The seismic wave barrier is composed of a plurality of barrier unit arrays arranged in sequence, each barrier unit comprises a negative Poisson's ratio base, a concrete frame and a soil body, and the negative Poisson's ratio base is provided with a placement groove for mounting the concrete frame; the concrete frame is arranged in the placement groove, the negative Poisson's ratio base is connected with the concrete frame through a plurality of connecting pieces, a mounting hole is formed in the middle of the concrete frame, the mounting hole is filled with the soil body, and the negative Poisson's ratio base, the concrete frame and the soil body are connected into a whole and form a metamaterial structure unit. Through the elastic wave band gap filtering effect of the wave barrier unit array made of the metamaterial, control and attenuation of seismic surface waves are realized.

Description

Technical Field

[0001] The invention relates to the technical field of engineering shock absorption, and in particular to an assembled negative Poisson's ratio seismic wave barrier and a design method thereof. Background Art

[0002] Earthquakes are extremely destructive natural disasters. The strong vibrations caused by earthquakes and the secondary disasters derived from them have brought extremely serious casualties and huge property losses to human society. When earthquake waves propagate inside and on the surface of the earth, they will have a strong impact on various building structures, causing catastrophic consequences such as cracks, tilts, and even collapses in buildings.

[0003] Among the many types of seismic waves, Rayleigh waves are typical surface waves with a frequency distribution in the range of 0.1–20 Hz. This frequency range is very close to the fundamental resonance frequency of most building structures. When Rayleigh waves act on buildings, resonance is easily induced, which causes the vibration amplitude of the building to increase sharply, and the degree of damage to the building is significantly amplified. Traditional shock absorption technology mainly adopts methods such as setting up seismic isolation bearings and using dampers. Seismic isolation bearings can reduce the transmission of seismic energy to the upper structure to a certain extent, but the isolation effect for low-frequency seismic waves is limited, and its scope of application is restricted by various factors such as building type and site conditions. Dampers mainly reduce structural vibration by consuming seismic energy. However, when facing ultra-low frequency and ultra-wideband seismic waves, it is often difficult to achieve the ideal shock absorption effect, and performance degradation and high maintenance costs may occur during long-term use. The limitations of these traditional shock absorption technologies have prompted researchers to continuously explore more effective methods for seismic wave attenuation and building structure protection.

[0004] Metamaterials, as an emerging artificial composite material or composite structure, are constructed from carefully designed artificial microstructure units. Compared with traditional materials existing in nature, metamaterials exhibit unique static and dynamic properties. These extraordinary properties do not originate from the chemical composition of the material itself, but depend on the special structure of the microstructure units and the complex interaction between them and the surrounding medium. Metamaterials have great control and design freedom, so their performance can be customized according to specific needs. In the field of earthquake engineering, periodic seismic wave barriers are constructed based on metamaterials. By rationally designing the microstructure units and their arrangement of metamaterials, they can significantly attenuate Rayleigh waves in the target range, thereby effectively protecting the structural safety of buildings. At present, the research on metamaterials in seismic wave attenuation is still in the stage of continuous development and improvement, but the great potential it shows provides new ideas and ways to solve the threat of earthquake disasters to building structures.

[0005] With the accelerated advancement of the construction industrialization process in modern society, prefabricated structures have been widely used as a new form of construction. They have many advantages such as fast construction speed, no influence from weather, strong quality controllability, environmental protection and energy saving. The advantages of prefabricated construction also facilitate the customized design of metamaterials.

[0006] The present invention combines the negative Poisson's ratio characteristics of metamaterials and the band gap characteristics of phononic crystals to construct an assembled negative Poisson's ratio seismic wave barrier, which can reduce the harm of seismic waves to structural safety and life safety with a small initial investment, and has significant economic and social benefits. Summary of the invention

[0007] In view of the above problems existing in the prior art, the purpose of the present invention is to provide an assembled negative Poisson's ratio seismic wave barrier and a design method thereof, so as to achieve control and attenuation of seismic surface waves through the elastic wave band gap filtering effect of the wave barrier unit array constructed of metamaterials.

[0008] In order to achieve the above-mentioned purpose, the present invention provides an assembled negative Poisson's ratio seismic wave barrier, which is composed of a plurality of barrier unit arrays arranged in sequence, wherein the barrier unit includes a negative Poisson's ratio base, a concrete frame, and a soil body, wherein the negative Poisson's ratio base is provided with a mounting groove for installing the concrete frame, and the concrete frame is arranged in the mounting groove, and the negative Poisson's ratio base is connected to the concrete frame through a plurality of connecting parts, and a mounting hole is provided in the middle of the concrete frame, and the soil body is filled in the mounting hole, and the negative Poisson's ratio base, the concrete frame, and the soil body are connected to form a whole and form a metamaterial structural unit.

[0009] Furthermore, the negative Poisson's ratio base is a negative Poisson's ratio foam base.

[0010] Furthermore, the negative Poisson's ratio base is composed of a rectangular bottom plate and vertical plates respectively vertically connected to four sides of the rectangular bottom plate, and the rectangular bottom plate and the vertical plates cooperate to form a rectangular placement groove.

[0011] Furthermore, the concrete frame is a rectangular frame, which corresponds to the wall of the rectangular placement groove, and the concrete frame is arranged in the rectangular placement groove and the side wall is in contact with the wall of the rectangular placement groove;

[0012] The installation hole in the middle of the concrete frame cooperates with the bottom of the rectangular placement groove to form a filling groove that can be filled with soil.

[0013] Furthermore, the plurality of connecting members are distributed equidistantly along the vertical plates in the negative Poisson's ratio base, and the connecting members pass through the vertical plates in turn and are connected to the concrete frame.

[0014] Furthermore, a steel cage is embedded in the concrete frame.

[0015] Furthermore, four corners of the concrete frame are respectively pre-embedded with pre-embedded sleeves, and the pre-embedded sleeves are connected with hanging parts.

[0016] In order to achieve the above object, the design method of the assembled negative Poisson's ratio seismic wave barrier provided by the present invention is used for any one of the above items, and the design method comprises:

[0017] S1: First, determine the design objectives based on the site environment, including the main frequency of the earthquake and the expected vibration reduction effect;

[0018] S2: Select the materials and structural parameters to be used for the barrier unit and design the barrier unit. Customizable material parameters include mass density, elastic modulus and Poisson's ratio, etc. Customizable structural parameters include negative Poisson's ratio base, concrete frame, soil shape, side length, thickness, etc. By designing the geometric dimensions and material parameters of the barrier unit, the band gap frequency band, i.e., the frequency range that produces a shock absorption effect, can be adjusted;

[0019] S3: For the metamaterial structural unit composed of negative Poisson's ratio base, concrete frame and soil, the band structure is obtained by dispersion analysis to determine the band gap range;

[0020] S4: Determine whether the band gap can cover the target vibration frequency. If the band gap can cover the target vibration frequency, proceed to the next design step. If the band gap interval does not match the target frequency, modify the material parameters and structural parameters of the barrier unit until the band gap meets the target frequency.

[0021] S5: determining the arrangement of seismic wave barriers, including the arrangement spacing, number of arrangement rows, number of arrangement, etc. of several barrier units, and calculating the transmission function;

[0022] S6: Determine whether the shock absorption effect meets the requirements. If the shock absorption effect does not meet the expectations, adjust the layout and number of barrier units in the seismic wave barrier until the transmission function meets the design expectations, and thus obtain the final design.

[0023] Furthermore, the specific process of modifying the material parameters of the barrier unit in S4 includes reducing the band gap starting frequency by lowering the elastic modulus of the negative Poisson's ratio base, concrete frame, and soil and increasing the Poisson's ratio; increasing the band gap width by reducing the density of the negative Poisson's ratio base, concrete frame, and soil, increasing the elastic modulus and reducing the Poisson's ratio; the specific process of modifying the structural parameters of the barrier unit includes increasing the band gap width and band gap range by increasing the side length of the negative Poisson's ratio base and increasing the thickness.

[0024] Furthermore, the specific process of adjusting the arrangement and number of barrier units in the seismic wave barrier in S6 includes reducing the arrangement spacing between a number of barrier units, increasing the number of arrangement rows and the number of arrangements, and the transmission function will gradually increase.

[0025] The assembled negative Poisson's ratio seismic wave barrier and the design method thereof provided by the present invention can fully exert the ultra-low frequency wide band gap filtering effect of the negative Poisson's ratio metamaterial by arranging the designed seismic wave barrier on the seismic wave propagation path, thereby reducing the negative impact of low-frequency earthquake vibrations on personal safety and building structures.

[0026] It can also achieve the regulation of specific frequency ranges and attenuation effects of seismic waves. The present invention utilizes seismic metamaterial vibration-damping bandgap filtering technology to achieve vibration attenuation of seismic waves of specific frequencies by adjusting the material parameters, structural parameters and layout of the wave barrier unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0028] Figure 1 A schematic diagram of the overall structure of the assembled negative Poisson's ratio seismic wave barrier provided by the present invention;

[0029] Figure 2 A schematic structural diagram of a barrier unit in an assembled negative Poisson's ratio seismic wave barrier provided by the present invention;

[0030] Figure 3 A schematic diagram of a dispersion analysis of a barrier unit in the assembled negative Poisson's ratio seismic wave barrier provided by the present invention;

[0031] Figure 4 A schematic diagram of a transmission function analysis of the assembled negative Poisson's ratio seismic wave barrier provided by the present invention;

[0032] Figure 5 A schematic diagram of the assembled negative Poisson's ratio seismic wave barrier provided by the present invention performing time domain analysis through seismic waves;

[0033] Figure 6 A schematic diagram of the frequency analysis of the assembled negative Poisson's ratio seismic wave barrier provided by the present invention through seismic waves;

[0034] Figure 7 A schematic diagram showing the influence of the arrangement and quantity of the assembled negative Poisson's ratio seismic wave barrier provided by the present invention on the transmission function;

[0035] Figure 8 A schematic diagram of the influence of material parameters on the band gap range in the assembled negative Poisson's ratio seismic wave barrier provided by the present invention;

[0036] Fig. 9 A schematic diagram of the influence of structural parameters on the band gap range in the assembled negative Poisson's ratio seismic wave barrier provided by the present invention;

[0037] Fig.10A flow chart of the design method of the assembled negative Poisson's ratio seismic wave barrier provided by the present invention.

[0038] Illustration Description:

[0039] Seismic wave barrier 10;

[0040] Barrier unit 100 , negative Poisson's ratio base 110 , rectangular bottom plate 111 , vertical plate 112 , rectangular mounting groove 113 , concrete frame 120 , mounting hole 121 , soil 130 , connecting piece 200 , steel cage 300 , embedded sleeve 410 , and hanging piece 420 . DETAILED DESCRIPTION

[0041] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below with reference to specific diagrams.

[0042] See also Figure 1-Figure 2 , which is a schematic diagram of the structure of the assembled negative Poisson's ratio seismic wave barrier provided by the present invention.

[0043] As can be seen from the figure, the assembled negative Poisson's ratio seismic wave barrier 10 provided by the present invention includes a component of a plurality of barrier units 100 .

[0044] The seismic wave barrier 10 is composed of an array of barrier units 100 arranged in sequence;

[0045] Furthermore, the barrier unit 100 includes a negative Poisson's ratio base 110, a concrete frame 120, and a soil body 130; the negative Poisson's ratio base 110 is a structural main body, used to carry other components.

[0046] The negative Poisson's ratio base 110 is provided with a placement groove for installing the concrete frame 120, the concrete frame 120 is arranged in the placement groove, and the negative Poisson's ratio base 110 and the concrete frame 120 are connected by a plurality of connecting members 200;

[0047] A mounting hole 121 is provided in the middle of the concrete frame 120, and the soil 130 is filled in the mounting hole 121. The negative Poisson's ratio base 110, the concrete frame 120, and the soil 130 are connected to form a whole and form a metamaterial structural unit.

[0048] Specifically, the negative Poisson's ratio base 110 is a negative Poisson's ratio foam base.

[0049] The negative Poisson's ratio base 110 is composed of a rectangular bottom plate 111 and vertical plates 112 vertically connected to four sides of the rectangular bottom plate 111, and the rectangular bottom plate 111 and the vertical plates 112 cooperate to form a rectangular placement groove 113;

[0050] The concrete frame 120 is a rectangular frame, which corresponds to the groove wall of the rectangular placement groove 113. The concrete frame 120 is arranged in the rectangular placement groove 113 and the side wall is in contact with the groove wall of the rectangular placement groove 113.

[0051] The mounting hole 121 in the middle of the concrete frame 120 cooperates with the bottom of the rectangular placement groove 113 to form a filling groove that can be filled with the soil 130.

[0052] A plurality of connecting members 200 are distributed in sequence and at equal intervals along the vertical plates 112 in the negative Poisson's ratio base 110 . The connecting members 200 pass through the vertical plates 112 in sequence and are connected to the concrete frame 120 .

[0053] Furthermore, in this solution, the mounting hole 121 is preferably in a regular octagonal shape.

[0054] In order to further improve the structural strength of the barrier unit 100, a steel cage 300 is embedded in the concrete frame 120, and the steel cage 300 can maintain the overall strength and rigidity of the whole.

[0055] Furthermore, concrete reinforcement is provided at the four corners of the concrete frame 120 to reduce stress concentration.

[0056] In order to facilitate the hoisting of the barrier unit 100 , embedded sleeves 410 are respectively embedded in the four corners of the concrete frame 120 , and the embedded sleeves 410 are connected with hoisting parts 420 for hoisting and installation during the construction process.

[0057] In order to protect the target building, according to the main frequency of the seismic surface wave and the target shock absorption level requirements, the material parameters and structural parameters of the barrier unit 100 are selected to construct the barrier unit 100. The assembled negative Poisson's ratio seismic wave barrier 10 is arranged on the propagation path of the seismic wave, and the barrier unit 100 is prefabricated in the factory. After the maintenance is completed, the on-site hoisting and installation construction is carried out. When the seismic wave propagates to the barrier unit 100, the band gap filtering effect is generated due to the interaction between the metamaterial structure and the seismic wave, resulting in the localization and attenuation of the seismic energy.

[0058] The present solution does not limit the material parameters and structural parameters mentioned above, and can be determined according to actual needs. For example, the structural parameters are: the side length of the negative Poisson's ratio base 110 is preferably 2m, the height of the negative Poisson's ratio base 110 is preferably 0.5m, the side length of the concrete frame 120 is preferably 1.8m, and the side length of the soil block 130 is c=1.6m.

[0059] The material parameters are as follows: the elastic modulus of the negative Poisson's ratio base 110 is 2.5e4 Pa, the density is 120kg / m3, and the Poisson's ratio is -0.8; the elastic modulus of the concrete frame 120 is 4e10 Pa, the density is 2500kg / m3, and the Poisson's ratio is 0.3; the elastic modulus of the soil 130 is 2e7 Pa, the density is 1800kg / m3, and the Poisson's ratio is 0.3.

[0060] The dispersion analysis is performed on the metamaterial structural unit composed of the negative Poisson's ratio base 110, the concrete frame 120, and the soil 130, such as Figure 3 This figure is a schematic diagram of the dispersion analysis of the barrier unit 100. The energy band structure of the barrier unit 100 is obtained. The results show that it has an ultra-low frequency and ultra-wide bandwidth attenuation band gap in the range of 2.4-50 Hz, that is, it can attenuate seismic waves within this frequency range.

[0061] In addition, a plurality of barrier units 100 are arrayed to form a seismic wave barrier 10, and a transmission function analysis is performed on the seismic wave barrier 10, such as Figure 4 This figure is a schematic diagram of the transmission function analysis of the seismic wave barrier 10. It can be seen that there is a significant attenuation domain within 2.4-50Hz, with a maximum attenuation amplitude of 403.9dB, and the frequency range of the attenuation domain is consistent with the band gap.

[0062] Furthermore, if the transmission function obtained by the above analysis does not meet the design expectation, the transmission function can be changed by adjusting the arrangement and number of the barrier units 100;

[0063] Since the negative Poisson's ratio seismic wave barrier 10 proposed by the present invention is arranged on the propagation path of the seismic surface wave, the seismic surface wave of a specific frequency is attenuated through the band gap filtering effect. Therefore, as the arrangement spacing decreases, the number of arrangement rows and the number of arrangement increase, the transmission function will gradually increase, and the attenuation effect will gradually increase. Taking the influence of the number of arrangement rows on the transmission function as an example, the transmission functions of different numbers of arrangement rows are calculated as follows, Figure 7 It is a schematic diagram showing the influence of the arrangement and quantity of the seismic wave barrier 10 on the transmission function;

[0064] It can be seen that the attenuation ranges corresponding to the wave barriers of 5 rows and 3 columns and 5 rows and 10 columns are basically the same, but the maximum attenuation amplitudes are different. The maximum attenuation amplitudes of the wave barriers of 5 rows and 3 columns and 5 rows and 10 columns are 168.3dB and 403.9dB, and as the number of rows increases, the overall attenuation effect of the bandgap frequency band gradually increases. For actual engineering applications, the number of rows and the number of arrangements do not need to be too many, and the arrangement spacing does not need to be very small, as long as the expected attenuation effect can be achieved through calculation, so as to achieve a balance between attenuation effect and cost savings.

[0065] In order to verify its attenuation effect on seismic waves, the classic 1940 El Centro earthquake wave was used for time domain and frequency domain analysis, such as Figure 5 This figure is a schematic diagram of time domain analysis of the seismic wave barrier 10 through seismic waves; Figure 6 This figure is a schematic diagram of frequency domain analysis of the seismic wave barrier 10 through seismic waves; it can be seen that significant attenuation effects are achieved in both time and frequency.

[0066] In addition, by adjusting the structural parameters such as shape, side length, thickness and material parameters such as elastic modulus, density and Poisson's ratio of the negative Poisson's ratio base 110, the concrete frame 120 and the soil 130, the reflection, scattering and transmission characteristics of the barrier unit 100 to seismic waves can be changed, and the band gap range can be regulated to meet the diverse needs of different regions and different building types for seismic wave attenuation in different frequency ranges.

[0067] Further, regarding the corresponding relationship between the material parameters and the band gap range, taking the negative Poisson's ratio base 110 as an example, Figure 8 , by adjusting its mass density, elastic modulus and Poisson's ratio, the band gap range can be adjusted. Taking the first band gap as an example, the specific rules are shown in the figure. As the density gradually increases, the band gap starting frequency remains basically unchanged, the band gap cutoff frequency gradually decreases, and the band gap width decreases; as the elastic modulus gradually increases, the band gap starting frequency and cutoff frequency both increase synchronously, and the band gap width increases; as the Poisson's ratio changes from negative to positive and gradually increases, the band gap starting frequency decreases, the band gap cutoff frequency decreases, and the band gap width decreases. In summary, the band gap starting frequency can be reduced by reducing the elastic modulus and increasing the Poisson's ratio; the band gap width can be increased by reducing the density of the negative Poisson's ratio base, increasing the elastic modulus and reducing the Poisson's ratio;

[0068] Further, regarding the corresponding relationship between the structural parameters and the band gap range, taking the negative Poisson's ratio base 110 as an example, Fig. 9 , by adjusting its geometric parameters such as shape, side length and thickness, the band gap range can be adjusted. As the side length of the negative Poisson's ratio base 110 increases, the starting frequency of the band gap increases, and the cut-off frequency increases. Since the increase in the cut-off frequency is significantly greater than the increase in the starting frequency, the band gap width increases significantly. As the thickness h of the wave barrier gradually increases, its frequency decreases, the cut-off frequency increases, and the band gap width increases. In addition, in addition to being set to a square, the negative Poisson's ratio base 110 can also be set to different shapes such as a circle, a hexagon, an octagon, and the corresponding band gap range can be obtained by calculation. The choice of specific shape can be determined according to the site construction needs and the type of mold. In summary, the band gap width and band gap range can be increased by increasing the inner side length of the negative Poisson's ratio base 110 (increasing the b / a ratio) and increasing the thickness (h / a).

[0069] In terms of material selection, the present invention uses metamaterials, concrete and soil as the main unit components, which can significantly reduce the manufacturing cost while ensuring the performance of the wave barrier structure. Compared with the traditional local resonance unit construction scheme using steel as a scatterer, it has a significant cost advantage. In addition, the present invention fills the interior of the wave barrier unit with soil 130, and the filling of soil 130 can play a role in structural positioning, ensuring the accurate positioning and stable layout of the wave barrier structure, and can improve the overall stability of the wave barrier structure under the action of seismic waves. In summary, the assembled negative Poisson's ratio seismic wave barrier structure proposed in the present invention has the advantages of significant shock absorption effect, customizable control, easy construction, and high installation efficiency.

[0070] Based on the assembled negative Poisson's ratio seismic wave barrier constructed by the above scheme, this scheme also provides a design method, such as Figure 7 This is a flow chart of the design method of the assembled negative Poisson's ratio seismic wave barrier. The construction steps are as follows:

[0071] S1: First, determine the design objectives based on the site environment, including the main frequency of the earthquake and the expected vibration reduction effect;

[0072] S2: Select the material and structural parameters to be used for the barrier unit 100, and design the barrier unit 100, wherein the customizable material parameters include mass density, elastic modulus, and Poisson's ratio, etc., and the customizable structural parameters include the shape, side length, and thickness of the negative Poisson's ratio base 110, the concrete frame 120, and the soil 130, etc. By designing the geometric dimensions and material parameters of the barrier unit 100, the band gap frequency band, that is, the frequency range that produces a shock absorption effect, can be adjusted;

[0073] S3: performing a dispersion analysis on the metamaterial structural unit composed of the negative Poisson's ratio base 110, the concrete frame 120, and the soil 130 to obtain an energy band structure and determine a band gap range;

[0074] S4: Determine whether the band gap can cover the target vibration frequency. If the band gap can cover the target vibration frequency, proceed to the next design step. If the band gap interval does not match the target frequency, modify the material parameters and structural parameters of the barrier unit 100 until the band gap meets the target frequency.

[0075] Furthermore, the specific process of modifying the material parameters of the barrier unit 100 includes reducing the band gap starting frequency by lowering the elastic modulus of the negative Poisson's ratio base 110, the concrete frame 120, and the soil 130 and increasing the Poisson's ratio; increasing the band gap width by reducing the density of the negative Poisson's ratio base 110, the concrete frame 120, and the soil 130, increasing the elastic modulus and reducing the Poisson's ratio; the specific process of modifying the structural parameters of the barrier unit 100 includes increasing the band gap width and the band gap range by increasing the side length of the negative Poisson's ratio base 110 and increasing the thickness.

[0076] S5: determining the arrangement of the seismic wave barrier 10, including the arrangement spacing, the number of arrangement rows, the number of arrangement, etc. of the plurality of barrier units 100, and calculating the transmission function;

[0077] S6: Determine whether the shock absorption effect meets the requirements. If the shock absorption effect (measured in dB) does not meet the expectations, adjust the arrangement and number of barrier units 100 in the seismic wave barrier 100 until the transmission function meets the design expectations, thereby obtaining the final design.

[0078] Furthermore, the specific process of adjusting the arrangement and number of barrier units 100 in the seismic wave barrier 100 includes reducing the arrangement spacing between a number of barrier units 100, increasing the number of arrangement rows and the number of arrangements, and the transmission function will gradually increase.

[0079] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An assembled negative Poisson's ratio seismic wave barrier, characterized in that: The seismic wave barrier is composed of a plurality of barrier unit arrays arranged in sequence, wherein the barrier unit comprises a negative Poisson's ratio base, a concrete frame, and a soil body. The negative Poisson's ratio base is provided with a mounting groove for installing the concrete frame, and the concrete frame is arranged in the mounting groove. The negative Poisson's ratio base is connected to the concrete frame through a plurality of connecting parts. A mounting hole is provided in the middle of the concrete frame, and the soil body is filled in the mounting hole. The negative Poisson's ratio base, the concrete frame, and the soil body are connected to form a whole and form a metamaterial structural unit.

2. The assembled negative Poisson's ratio seismic wave barrier according to claim 1 is characterized in that: The negative Poisson's ratio base is a negative Poisson's ratio foam base.

3. The assembled negative Poisson's ratio seismic wave barrier according to claim 1 is characterized in that: The negative Poisson's ratio base is composed of a rectangular bottom plate and vertical plates respectively vertically connected to four sides of the rectangular bottom plate, and the rectangular bottom plate and the vertical plates cooperate to form a rectangular placement groove.

4. The assembled negative Poisson's ratio seismic wave barrier according to claim 3 is characterized in that: The concrete frame is a rectangular frame, which corresponds to the rectangular placement groove wall. The concrete frame is arranged in the rectangular placement groove and the side wall is in contact with the rectangular placement groove wall. The installation hole in the middle of the concrete frame cooperates with the bottom of the rectangular placement groove to form a filling groove that can be filled with soil.

5. The assembled negative Poisson's ratio seismic wave barrier according to claim 3 is characterized in that: The plurality of connecting members are distributed equidistantly along the vertical plates in the negative Poisson's ratio base in sequence, and the connecting members pass through the vertical plates in sequence and are connected to the concrete frame.

6. The assembled negative Poisson's ratio seismic wave barrier according to claim 1, characterized in that: A steel cage is embedded in the concrete frame.

7. The assembled negative Poisson's ratio seismic wave barrier according to claim 1, characterized in that: The four corners of the concrete frame are respectively pre-buried with pre-buried sleeves, and the pre-buried sleeves are connected with hanging parts.

8. A method for designing an assembled negative Poisson's ratio seismic wave barrier, characterized in that: include: S1: First, determine the design objectives based on the site environment, including the main frequency of the earthquake and the expected vibration reduction effect; S2: Select the materials and structural parameters to be used for the barrier unit and design the barrier unit. Customizable material parameters include mass density, elastic modulus and Poisson's ratio, etc. Customizable structural parameters include negative Poisson's ratio base, concrete frame, soil shape, side length, thickness, etc. By designing the geometric dimensions and material parameters of the barrier unit, the band gap frequency band, i.e., the frequency range that produces a shock absorption effect, can be adjusted; S3: For the metamaterial structural unit composed of negative Poisson's ratio base, concrete frame and soil, the band structure is obtained by dispersion analysis to determine the band gap range; S4: Determine whether the band gap can cover the target vibration frequency. If the band gap can cover the target vibration frequency, proceed to the next design step. If the band gap interval does not match the target frequency, modify the material parameters and structural parameters of the barrier unit until the band gap meets the target frequency. S5: determining the arrangement of seismic wave barriers, including the arrangement spacing, number of arrangement rows, number of arrangement, etc. of several barrier units, and calculating the transmission function; S6: Determine whether the shock absorption effect meets the requirements. If the shock absorption effect does not meet the expectations, adjust the layout and number of barrier units in the seismic wave barrier until the transmission function meets the design expectations, and thus obtain the final design.

9. The design method of the assembled negative Poisson's ratio seismic wave barrier according to claim 8 is characterized in that: The specific process of modifying the material parameters of the barrier unit in S4 includes reducing the band gap starting frequency by lowering the elastic modulus of the negative Poisson's ratio base, concrete frame, and soil and increasing the Poisson's ratio; The gap width is increased by reducing the density of the negative Poisson's ratio base, concrete frame, and soil, increasing the elastic modulus and reducing the Poisson's ratio; the specific process of modifying the structural parameters of the barrier unit includes increasing the gap width and gap range by increasing the side length of the negative Poisson's ratio base and increasing the thickness.

10. The design method of the assembled negative Poisson's ratio seismic wave barrier according to claim 8 is characterized in that: The specific process of adjusting the arrangement and number of barrier units in the seismic wave barrier in S6 includes reducing the arrangement spacing between a number of barrier units, increasing the number of arrangement rows and the number of arrangements, and the transmission function will gradually increase.

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