CN114606987A - Grid type seismic lamb wave barrier structure - Google Patents
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- CN114606987A CN114606987A CN202210239826.8A CN202210239826A CN114606987A CN 114606987 A CN114606987 A CN 114606987A CN 202210239826 A CN202210239826 A CN 202210239826A CN 114606987 A CN114606987 A CN 114606987A
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- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
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- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/08—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against transmission of vibrations or movements in the foundation soil
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Abstract
The invention discloses a grid type seismic lamb wave barrier structure which is formed by periodically arranging grid type seismic lamb wave barrier structure unit cells around a target protection building and combining the grid type seismic lamb wave barrier structure unit cells into a whole, wherein the generated band gap characteristic can block seismic lamb waves under specific frequency. The grid type seismic lamb wave barrier structure unit cell comprises a structure formed by combining an embedded steel core (1), a rubber layer (2) and soil (3). The steel core is a hollow steel core in a shape like a Chinese character 'jing' formed by vertically and symmetrically embedding four same steel plates, the rubber layer is wrapped on the outer side of the steel core in the same thickness, and soil is wrapped on the outer side of the rubber layer. The grid type seismic lamb wave barrier structure can attenuate seismic surface waves within the range of 11.05-21.25Hz, and the seismic surface waves within the frequency range cannot be transmitted through a seismic metamaterial, so that the purpose of protecting a target building is achieved, and the seismic function is realized.
Description
Technical Field
The invention relates to a grid type seismic lamb wave barrier structure, in particular to a seismic metamaterial structure for blocking seismic surface waves, especially lamb wave propagation.
Background
Until now, earthquake is one of the most harmful and damaging natural disasters to human society, and according to statistics, about 500 ten thousand earthquakes occur in the world every year, and over 120 ten thousand people die of earthquake only in the last century. Therefore, realizing low-cost and high-efficiency shock resistance is still a proposition studied by the current scholars. In recent years, seismic metamaterial structures have appeared in the field of seismic design with their excellent seismic performance. The fundamental resonance frequency of a building is generally about 2Hz, and the frequency of the seismic surface wave is generally 0.1 to 20Hz, which is just in the range of the fundamental resonance frequency of the building, so the seismic surface wave has great harm to the building. The traditional anti-seismic method mainly adopts the mode of arranging an energy dissipation device or an isolation support on the structure, but has obvious defects of poor durability, short service life and difficult replacement of the anti-seismic device, and the method cannot be adopted for important buildings such as ancient buildings, the number of the current complex-structure buildings is increased day by day, and the traditional anti-seismic method cannot meet the requirements of building structures. Therefore, based on the wave barrier structure developed from the solid physics field to the seismic engineering field by the phononic crystal, the generated band gap characteristic can block the propagation of seismic surface waves under specific frequency, and a new thought is provided for seismic design.
Heretofore, the adjusting mechanisms of the seismic metamaterial are mainly divided into two types, namely a Bragg scattering mechanism and a local resonance mechanism, and the wavelength corresponding to the band gap frequency generated by the Bragg scattering mechanism and the lattice constant are in the same order, so that the structural size designed based on the Bragg scattering mechanism is too large to realize wide application; the local resonance mechanism has the characteristic of 'controlling large wavelength in a small size', but due to the narrow band gap, the wide-range attenuation of frequency is difficult to realize. Therefore, the invention aims to design a low-frequency wide-band-gap seismic metamaterial structure based on a local resonance mechanism, so that the attenuation of seismic waves can be effectively controlled, the seismic aim is achieved, and the metamaterial structure has important significance for protecting buildings with special seismic requirements, such as ancient buildings, nuclear power stations, precise instrument laboratories and the like.
Disclosure of Invention
The invention discloses a grid type earthquake lamb wave barrier structure, and relates to a wave barrier structure which can shield or attenuate earthquake waves before the earthquake waves are transmitted to a protected building, so that the earthquake resistance of the building is achieved by the characteristics of low cost, easiness in material taking, simple structure, wide application range and the like, the damage of the earthquake waves to the building is controlled and attenuated, and the loss caused by disasters is reduced.
The invention relates to a grid type seismic lamb wave barrier structure, which is formed by periodically arranging grid type seismic lamb wave barrier structure unit cells around a target protection building to form a whole, wherein the generated band gap characteristic can block seismic lamb waves under specific frequency. The grid type seismic lamb wave barrier structure unit cell comprises a structure formed by combining an embedded steel core (1), a rubber layer (2) and soil (3). The steel core forms "well" font cavity steel core for the perpendicular symmetry gomphosis of four the same steel sheets, and the rubber layer wraps up in the steel core outside with the same thickness, and soil wraps up in the rubber layer outside, and whole structure is square column, structural dimension: the length is 2m, the thickness is 2m, and the height is 4 m.
The invention relates to a grid type seismic lamb wave barrier structure, wherein an inner steel core of the grid type seismic lamb wave barrier structure is of a 'groined' hollow structure formed by vertically and symmetrically embedding four steel plates with the same material parameters, and each steel plate is 1.9m in length, 0.2m in thickness and 4m in height.
Furthermore, the rubber layer wraps the outer side of the steel core in a thickness of 0.05m, and the height of the rubber layer is 4 m.
Furthermore, soil is wrapped on the outer side of the rubber layer and consists of earth columns with three sizes, and the hollow part of the steel core and the outer layer part of the rubber are filled with the earth columns with the three sizes, so that the whole size is a structural unit cell with the length of 2m, the thickness of 2m and the height of 4 m.
The grid type seismic lamb wave barrier structure is arranged around a target protection building in a surrounding mode in a periodic arrangement mode, the unit cell center distance is 2m, and seismic waves are blocked by seismic metamaterials before being transmitted to the target protection building through the generated band gap characteristic, so that the seismic waves are effectively inhibited and attenuated, and the target building is protected.
The technical scheme of the invention is as follows:
the invention provides a grid type seismic lamb wave barrier structure which is vertically and continuously extended in two directions and annularly arranged around a target protection building, seismic waves cannot penetrate through a seismic metamaterial structure to reach the building through band gap characteristics, and are blocked or attenuated at the seismic metamaterial structure.
The invention relates to a grid type seismic lamb wave barrier structure unit cell which consists of an embedded steel core (1), a rubber layer (2) and a soil layer (3). The rubber layer (2) with the thickness of 0.05m is coated on the outer side of the embedded steel core (1) to form a composite hollow structure in a shape like a Chinese character jing, and the composite hollow structure in the shape like the Chinese character jing is placed in a soil layer to form a structural unit cell with the length of 2m, the thickness of 2m and the height of 4 m.
The centroids of all parts of the embedded steel core (1), the rubber layer (2) and the soil layer (3) are overlapped, and the three components are vertically symmetrical in a horizontal plane and are overlapped along the central axis in the height direction.
The grating type seismic lamb wave barrier structure material is common, simple in components and easy to obtain.
Please refer to fig. 2 and fig. 3. The invention relates to a material of a grid type seismic lamb wave barrier structure, which comprises steel, rubber and soil. The material parameters of the components are detailed as follows, and the material parameters of the steel plate are as follows: density p1＝7784kg/m3(ii) a Young's modulus E1＝2.10×1011Pa; poisson ratio gamma10.3; density of rubber layer ρ2＝1300kg/m3(ii) a Young's modulus E2＝1.2×105Pa; poisson ratio gamma20.47. Density of soil ρ3＝1800kg/m3(ii) a Young's modulus E3＝2.0×107Pa; poisson ratio gamma3＝0.3。
The invention relates to a grid type seismic lamb wave barrier structure which has the following advantages:
1) the size is small, and the large-scale process production is easy. The band gap mechanism generated by the grid type seismic lamb wave barrier structure is local resonance, and the grid type seismic lamb wave barrier structure is characterized in that the lattice constant of the grid type seismic lamb wave barrier structure can be far smaller than the wavelength, the lattice constant of a structural unit cell is 2m, and the lattice constant of a structure designed based on a Bragg scattering mechanism generally reaches 10m or more. Therefore, the structure has small size and is suitable for large-scale process production.
2) The application condition is flexible, and the application range is wide. The band gap frequency of the grating type seismic lamb wave barrier structure is two frequency bands of 11.05-21.25Hz, and seismic lamb waves in the frequency range cannot pass through the seismic metamaterial structure. It is worth noting that the band gap range of the structure is not fixed, and different band gap ranges can be generated by changing the material parameters of the thickness, the density, the Young modulus and the like of steel and rubber so as to achieve the anti-seismic purpose of different buildings.
Furthermore, the structure can be used for resisting earthquake, and can also be applied to damping vibration generated under the conditions of underground operation, track construction, tunnel excavation, use of large-scale vibration equipment and the like.
3) And (4) protecting the region coverage. The grid type seismic lamb wave barrier structure can protect a single building, the attenuation of the grid type seismic lamb wave barrier structure to seismic waves can extend to a range area behind a metamaterial structure, the seismic metamaterial structure can attenuate the seismic waves in a multi-angle and all-around mode so as to protect a target building, and a certain protection effect is achieved on a building group.
4) The structural composition material is easy to obtain and low in cost. The components of the structure are steel, rubber and soil, which are common materials in the engineering field, and the structure is low in cost and easy to obtain.
5) Easy to be assembled and disassembled again, and the service cycle is prolonged. The traditional anti-seismic method of engineering is to arrange a shock-absorbing structure such as a vibration isolation support in a building, and the traditional anti-seismic method has the defects that the durability is poor and the support cannot be replaced. The grid type seismic lamb wave barrier structure is buried on the ground surface around a building, and after the grid type seismic lamb wave barrier structure is used for a long time, the grid type seismic lamb wave barrier structure is convenient to replace and easy to realize for partial metamaterial structures which are seriously damaged and cannot continuously meet the use requirements.
6) The structure is simple. The structure is formed by the embedded steel core (1), the rubber layer (2) and the soil layer (3) according to the requirements of the invention to form a structural unit cell, the structural form is simple, and the structure is easy to put into practical production and application.
Drawings
FIG. 1 is a schematic view of the structural arrangement of a grid type seismic lamb wave barrier according to the present invention;
FIG. 2 is a top view of a grid seismic lamb wave barrier unit cell according to the present invention;
FIG. 3 is a band diagram of a grating seismic lamb wave barrier structure according to the invention;
FIG. 4 is a transmission spectrum of a grid seismic lamb wave barrier structure simulation experiment of the present invention;
wherein: 1. embedding the steel core; 2. a rubber layer; 3. and (4) a soil layer.
Detailed Description
In order to make the functions, technical solutions and advantages of the present invention clearer, embodiments of the present invention will be further described with reference to the accompanying drawings.
The invention provides a grid type seismic lamb wave barrier structure, wherein a structural unit cell of the grid type seismic lamb wave barrier structure consists of an embedded steel core (1), a rubber layer (2) and a soil layer (3).
Referring to fig. 1, four steel plates with the same size are combined into a chimeric steel core structure (1) through a welding process, wherein the size of each steel plate is as follows: the length was 1.9m, the thickness 0.2m and the height 4 m. The interior of the rubber layer (2) is hollow, the steel core is wrapped by the rubber layer, and the thickness of the wrapped rubber layer is 0.05 m.
Further, a soil layer (3) is filled in the hollow part and the outer side of the steel core to form a grid type seismic lamb wave barrier structure unit cell, the unit cell length is 2m, the thickness is 2m, and the height is 4 m.
Furthermore, the formed grid type seismic lamb wave barrier structure unit cells are periodically arranged around a target protection building, the centroid distance of the two unit cells is 2m, and the upper plane and the lower plane are flush.
The centroids of the embedded steel core (1), the rubber layer (2) and the soil layer (3) are superposed with each other and are superposed along the central axis in the height direction.
The specific material parameters are as follows:
steel: density p1＝7784kg/m3(ii) a Young's modulus E1＝2.10×1011Pa; poisson ratio gamma1＝0.3；
Rubber: density p2＝1300kg/m3(ii) a Young's modulus E2＝1.02×105Pa; poisson ratio gamma2＝0.47。
Soil: density p3＝1800kg/m3(ii) a Young's modulus E3＝2.0×107Pa; poisson ratio gamma3＝0.3。
Referring to fig. 3, fig. 3 is a diagram of a band structure (also called a frequency dispersion graph) of the structure, in which the full-range band gap generated by the structure is marked by a gray region. According to the result of the calculation of the energy band structure, the structure has a wide band gap in the range of 0.1-20 Hz. The frequency range of the band gap is 11.05-21.25Hz, and the band gap width is 10.20 Hz.
Referring to fig. 4, fig. 4 is a simulated transmission spectrum of the structure. In the experiment, 10 rows of unit cells are periodically arranged in front of a target protection building, a generated transmission spectrum attenuation domain is marked by a gray area, and the transmission spectrum attenuation domain is 11.30-21.30Hz, which is consistent with the band gap range of an energy band structure.
In summary, the invention provides a grid type seismic lamb wave barrier structure, which is based on the local resonance principle and utilizes the band gap characteristic to attenuate lamb waves, but the invention is not limited to lamb waves and has good attenuation effects on body waves and surface waves. The earthquake-proof structure is periodically arranged on the outer side of the building, so that the earthquake waves can be effectively attenuated before reaching the target protection building, and the earthquake-proof structure is low in cost. In addition, according to the seismic design requirements of the building, different band gap frequency ranges can be obtained by changing the material parameters of the structure so as to meet the seismic requirements of different buildings, the structure is flexible and changeable, the application range is wide, and the grid type seismic lamb wave barrier structure is particularly suitable for large-scale important buildings such as nuclear power stations, ancient buildings, precise laboratories and the like.
Claims (6)
1. A grid type seismic lamb wave barrier structure is characterized in that: the grid type seismic lamb wave barrier structure unit cells are periodically arranged around a target protection building to form a whole, and the generated band gap characteristic can block seismic lamb waves under specific frequency; the grid type seismic lamb wave barrier structure unit cell comprises a structure formed by combining an embedded steel core (1), a rubber layer (2) and soil (3); the steel core is a hollow steel core in a shape like a Chinese character 'jing' formed by vertically and symmetrically embedding four same steel plates, the rubber layer is wrapped on the outer side of the steel core in the same thickness, soil is wrapped on the outer side of the rubber layer, and the whole structure is a square column.
2. A grid-type seismic lamb wave barrier structure according to claim 1, wherein: the internal steel core of the seismic wave barrier structure is vertically and symmetrically embedded by four steel plates with completely the same material parameters to form a hollow structure in a shape like a Chinese character 'jing'.
3. A grid-type seismic lamb wave barrier structure according to claim 1, wherein: the rubber layer is wrapped on the outer side of the steel core in a thickness of 0.05m, and the height of the rubber layer is 4 m.
4. A grid-type seismic lamb wave barrier structure according to claim 1, wherein: the soil is wrapped on the outer side of the rubber layer and consists of soil columns with three sizes, and the hollow part of the steel core and the outer layer part of the rubber are filled in the soil columns with the three sizes.
5. A grid-type seismic lamb wave barrier structure according to claim 1, wherein: the unit cell consists of an embedded steel core (1), a rubber layer (2) and a soil layer (3); and coating a rubber layer (2) with the thickness of 0.05m on the outer side of the embedded steel core (1) to form a composite hollow structure in a shape like a Chinese character jing, and placing the composite hollow structure in the soil layer.
6. A grid-type seismic lamb wave barrier structure according to claim 1, wherein: the centroids of all parts of the embedded steel core (1), the rubber layer (2) and the soil layer (3) are overlapped, and the three components are vertically symmetrical in a horizontal plane and are overlapped along the central axis in the height direction.
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- 2022-03-12 CN CN202210239826.8A patent/CN114606987A/en active Pending
Patent Citations (6)
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| CN112878384A (en) * | 2021-01-18 | 2021-06-01 | 西北工业大学 | Seismic metamaterial and method for blocking seismic lamb wave propagation |
| CN113389292A (en) * | 2021-06-17 | 2021-09-14 | 北京工业大学 | Wave barrier structure with low-frequency ultra-wide attenuation domain and manufacturing method |
| CN113389294A (en) * | 2021-06-17 | 2021-09-14 | 北京工业大学 | Low-frequency damping cross fractal wave barrier structure and manufacturing method thereof |
| CN113389295A (en) * | 2021-06-17 | 2021-09-14 | 北京工业大学 | Combined steel type seismic surface wave barrier structure and manufacturing method thereof |
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