CN112663684A - Low-frequency damping nine-round-pile earthquake glume structure - Google Patents
Low-frequency damping nine-round-pile earthquake glume structure Download PDFInfo
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Abstract
The invention discloses a low-frequency damping nine-round-pile earthquake glume structure which is formed by extending earthquake glume structure unit cells in two mutually vertical directions in a horizontal plane and is designed on the periphery of a building foundation, wherein the earthquake glume structure unit cells comprise first steel piles, second steel piles, first hollow concrete piles, second hollow concrete piles and a soil layer. The cross sections of the first steel pile and the second steel pile are circular. The cross sections of the first hollow concrete pile and the second hollow concrete pile are both circular rings. The soil layer cross-section is square, and nine circular through holes are distributed on the soil layer cross-section. The four small circular through holes are respectively positioned at four opposite corners of the square and have equal center spacing with the large circular through holes. The center distance of each small round through hole is equal. The low-frequency damping nine-round-pile seismic metamaterial structure has the advantages of omnibearing and multi-angle seismic surface wave attenuation, building protection, simple material drawing, convenience in arrangement, effective reduction of seismic disasters, and reduction of building post-disaster repair and maintenance cost.
Description
Technical Field
The invention relates to a low-frequency damping nine-sub round pile seismic metasoma structure, which is a new structure with good control and attenuation effects on seismic surface waves.
Background
China is located between an Eurasian seismic zone and a Pacific seismic zone, the earthquake is frequent, the intensity is high, the earthquake focus is shallow, the earthquake risk is high, the urban bearing body has serious earthquake damage, and a plurality of projects have huge and complex structures, such as transformer substations, and a large number of transformer substations need to be built in earthquake-resistant adverse areas with high earthquake intensity due to uneven distribution of energy bases and electric loads. The structural damage caused by earthquake, personal casualties and secondary disasters caused by earthquake bring huge economic loss and irreversible damage to the society. Therefore, it is very important for earthquake prevention and control, especially for earthquake prevention and control of major projects. Among the various types of seismic waves, the surface seismic wave is the most damaging to buildings due to the characteristics of low frequency, high amplitude, slow attenuation and the like. A large number of previous earthquake damage researches show that seismic waves within the range of 0.1-20Hz easily cause building resonance.
In a common earthquake-resistant method, energy dissipation and shock absorption components are arranged in a building, and a part of earthquake energy is consumed through elastic-plastic deformation of the components, so that the earthquake energy applied to the building is reduced. However, under a great shock, the method can cause great elastic-plastic deformation of the building. Recently, the 'earthquake metastructure' researched in the field of solid mechanics provides a new approach for earthquake protection. Based on a phononic crystal theory, the principle that a phononic crystal controls mechanical waves is utilized to carry out ordered structure design on key physical dimensions of the material, and a periodic structure with extraordinary physical properties, namely a seismic metastructure, is obtained. In order to effectively control and attenuate low-frequency seismic surface waves and reduce seismic damage loss, the invention introduces the definition of 'seismic metastructure', adopts concrete and steel to form a damping structure, has simple structure and strong flexibility, is convenient for construction operation, and has very important significance for protecting heavy building structures such as transformer substations, ancient buildings and the like.
Disclosure of Invention
The invention discloses a low-frequency damping nine-round-pile seismic metastructure and relates to a seismic metastructure for attenuating seismic surface waves. The low-frequency damping nine-round-pile seismic glume structure aims at providing the low-frequency damping nine-round-pile seismic glume structure which is omnibearing and multi-angle and can attenuate seismic surface waves, protect buildings, is simple in material taking and convenient to arrange, effectively reduces seismic disasters and reduces the post-disaster repair and maintenance cost of the buildings.
The invention relates to a low-frequency damping nine-round-pile seismic metastructure which is formed by extending a plurality of seismic metastructure unit cells in two mutually vertical directions in a horizontal plane and is designed on the periphery of a building foundation; each seismic metasoma unit cell comprises a first steel pile (1), a second steel pile (3), a first hollow concrete pile (2), a second hollow concrete pile (4) and a soil layer (5). The cross section of the soil layer (5) is square, and nine circular through holes are distributed on the soil layer. The four small circular through holes are respectively positioned in the centers of the four sides of the square, and the distances between the four small circular through holes and the centers of the large circular through holes are equal. The other four small circular through holes are respectively positioned at four opposite corners of the square and have equal center spacing with the large circular through holes. The center distance of each small round through hole is equal. The first steel pile (1) and the first hollow concrete pile (2) are arranged in the middle of the large circular through hole. The second steel pile (3) and the second hollow concrete pile (4) are arranged between the eight small circular through holes. The sections of the first steel pile (1) and the second steel pile (3) are circular. The sections of the first hollow concrete pile (2) and the second hollow concrete pile (4) are both circular rings.
The radius of the first steel pile (1) is 0.4m, the height is 18m, and common carbon structural steel is selected. The radius of the second steel pile (3) is 0.1m, the height is 18m, and common carbon structural steel is selected. The outer diameter of the first hollow concrete pile (2) is 0.45m, the inner diameter is 0.4m, the height is 18m, and C20-C30 plain concrete is selected. The outer diameter of the second hollow concrete pile (4) is 0.15m, the inner diameter is 0.1m, the height is 18m, and C20-C30 plain concrete is selected. The side length of the square cross section of the soil layer (5) is 2m, the height of the soil layer is 18m, and the soil layer is made of sandy soil. The distances between the centers of the four small circular piles positioned at the centers of the four sides of the square structure and the centers of the large circular piles are all 0.7 m. The center distance between the small circular piles and the large circular piles at the four opposite corners of the square structure is 0.99 m. The center distance of each small round pile is 0.7 m.
The structure of the invention is arranged on the periphery of a building foundation, the top surface of the structure is flush with the ground surface, and the structure is arranged along the circumferential direction of the building and is 6m away from the building horizontally. The peripheral size of the periodic structure formed by the extension of the unit cell structure is not less than the size of the building foundation.
The technical scheme of the invention is as follows:
a low-frequency damping nine-round-pile earthquake glume structure is formed by continuously extending designed earthquake glume structure unit cells along two mutually perpendicular directions in a horizontal plane. The periodic structure is arranged below the ground surface at the periphery of the building foundation and is arranged along the circumferential direction of the building in a segmented mode within a certain range, and the band gap characteristic of the periodic structure is utilized to attenuate seismic surface waves within the range of 4-16Hz, so that the building is protected from being damaged by the seismic surface waves.
The first steel pile (1), the second steel pile (3), the first hollow concrete pile (2), the second hollow concrete pile (4) and the soil layer (5) are the same in height, and the upper surface and the lower surface are on the same horizontal plane.
The cross sections of the first steel pile (1) and the second steel pile (3) are circular, the cross sections of the first hollow concrete pile (2) and the second hollow concrete pile (4) are circular rings, and the cross section of the soil layer (5) is square.
The first steel pile (1), the first hollow concrete pile (2) and the soil layer (5) are overlapped with each other in axle center.
The low-frequency damping nine-sub round pile seismic metamaterial structure designed by the invention is prepared from different materials.
The materials of the low-frequency damping nine-sub circular pile seismic glume structure comprise concrete, steel and soil. Referring to FIGS. 2 and 3, the density ρ of the concrete1＝2500kg/m3(ii) a Young's modulus E1＝4×1010Pa; poisson ratio gamma10.2; density of steel rho2＝7850kg/m3(ii) a Young's modulus E2＝2.1×1011Pa; poisson ratio gamma20.3; soil density of soil layer rho3＝1800kg/m3(ii) a Young's modulus E3＝2×107Pa; poisson ratio gamma3＝0.3。
Compared with the prior energy dissipation, shock absorption and earthquake resistance method, the invention at least has the following advantages:
1) the low-frequency damping nine-sub circular-pile seismic metastructure designed by the invention is a periodic structure, is designed based on a phonon crystal theory, has a band gap characteristic, and can effectively control and attenuate seismic surface waves within a range of 4-16 Hz. By utilizing the low-frequency damping nine-round-pile earthquake glume structure, various building structures with the resonance frequency within the range of 4-16Hz can be effectively protected.
2) The seismic metastructure designed by the cable can effectively control and attenuate the seismic surface wave within the range of 4-16Hz, and has a certain attenuation function on the elastic surface wave within the range of 4-16 Hz.
3) The seismic metastructure designed by the invention is not arranged on the building structure itself but arranged on the periphery of the building structure. When an earthquake occurs, the surface wave of the earthquake in the band gap range can be attenuated and even isolated by the designed earthquake metastructure, and can not pass through the designed structure, so that the effect of protecting the building structure is achieved.
4) Furthermore, when a large earthquake occurs, if the band gap comprises a resonance frequency, the surface wave of the earthquake in the band gap frequency range can be attenuated or isolated, so that irreparable harm caused by dangerous elastic-plastic deformation of the building can be avoided.
5) The low-frequency damping nine-sub circular pile seismic metamaterial structure designed by the invention uses materials commonly used in building engineering. The steel, concrete and sand used in the design are very common and easy to obtain in the building construction process.
6) Furthermore, the seismic metastructure designed by the invention has a simpler structure and mainly comprises three parts, namely a steel pile, a hollow concrete pile and a soil layer, which have two different sizes. The processing and manufacturing are convenient, and the construction operation is convenient.
7) The low-frequency damping nine-round-pile seismic glume structure designed by the invention is very flexible to apply. Due to the difference of geological conditions, building environments and the like in different areas, the earthquake-resistant requirements of different site conditions and building structures can be met by adjusting the material parameters or the sizes of the components of the earthquake metastructure.
8) Furthermore, the arrangement form of the designed seismic metastructure can be flexibly adjusted according to the difference of the environment and the geological conditions of the area where the building structure is located. The designed seismic metastructure can be adjusted to be arranged along the subsection and the annular direction of the building, the site condition is fully utilized, the flexibility is improved, and the seismic benefit is increased.
Drawings
Fig. 1 is a schematic diagram of the arrangement of the seismic metastructures provided by the present invention.
FIG. 2 shows a low-frequency damping nine-round-pile seismic metastructural unit cell provided by the invention.
FIG. 3 is a top view of a low-frequency damping nine-round-pile seismic metastructural unit cell provided by the invention.
Fig. 4 is a diagram of an energy band structure of a low-frequency damping nine-round-pile seismic metastructure provided by the invention.
Fig. 5 is a seismic metastructure transmission spectrum composed of ten rows of low-frequency shock-absorbing nine-round-pile seismic metastructure unit cells when rayleigh waves are excited in the direction of the khaki provided by the present invention.
Wherein: 1. a first steel pile; 2. a first concrete pile; 3. a second steel pile; 4. a second concrete pile; 5. and (4) a soil layer.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The nine-round-pile seismic glume-structure unit cell with the low-frequency shock absorption function consists of a first steel pile (1), a second steel pile (3), a first hollow concrete pile (2), a second hollow concrete pile (4) and a soil layer (5).
Firstly, coating a first hollow concrete pile (2) on the outer side of a first steel pile (1) to obtain a large round pile. And secondly, coating a second hollow concrete pile (4) on the outer side of the second steel pile (3) to obtain the small-sized round pile. And repeating the second step to obtain eight small-sized round piles.
The outer side of the first steel pile (1) is tightly attached to the inner side of the first hollow concrete pile (2). And similarly, the outer side of the second steel pile (3) is tightly attached to the inner side of the second hollow concrete pile (4).
Then, the soil pit is dug according to the structural arrangement schematic diagram of fig. 1. Nine round piles are set as shown in fig. 3. The four small circular piles are respectively positioned in the centers of four sides of the square structure, and the distance between the four small circular piles and the center of the large circular pile is 0.7 m. The other four small circular piles are respectively positioned at four opposite corners of the square structure, and the distance between the other four small circular piles and the center of the large circular pile is 0.99 m. The center distance of each small round pile is 0.7 m. And finally, filling soil to obtain the low-frequency damping nine-round-pile earthquake glume-structure unit cell with the side length of 2m and the height of 18 m.
The first steel pile (1), the second steel pile (3), the first hollow concrete pile (2), the second hollow concrete pile (4) and the soil layer (5) are the same in height, and the upper surface and the lower surface are on the same horizontal plane.
And (3) repeating the steps, referring to the structural arrangement schematic diagram shown in FIG. 1, manufacturing the rest seismic metastructural unit cells, and arranging the rest seismic metastructural unit cells in a segmented annular manner around the building.
As shown in fig. 2 and 3, the radius of the first steel pile (1) of the low-frequency damping nine-round-pile seismic glume structure is 0.4m, the height of the first steel pile is 18m, and common carbon structural steel is selected. The radius of the second steel pile (3) is 0.1m, the height is 18m, and common carbon structural steel is selected. The outer diameter of the first hollow concrete pile (2) is 0.45m, the inner diameter is 0.4m, the height is 18m, and C20-C30 plain concrete is selected. The outer diameter of the second hollow concrete pile (4) is 0.15m, the inner diameter is 0.1m, the height is 18m, and C20-C30 plain concrete is selected. The side length of the square cross section of the soil layer (5) is 2m, the height of the soil layer is 18m, and the soil layer is made of sandy soil.
The specific material parameters are as follows:
concrete: density p1＝2500kg/m3(ii) a Young's modulus E1＝4×1010Pa; poisson ratio gamma1＝0.2；
Steel: density p2＝7850kg/m3(ii) a Young's modulus E2＝2.1×1011Pa; poisson ratio gamma2＝0.3；
Soil: density p3＝1800kg/m3(ii) a Young's modulus E3＝2×107Pa; poisson ratio gamma3＝0.3；
As shown in fig. 4, an energy band structure diagram of the seismic metastructure designed by the present invention is given, in which the full band gap range of the energy band structure is marked with a light gray area. The calculation shows that the designed seismic metastructure has band gaps in the range of 4-16Hz, and four full band gaps exist in the controllable attenuation seismic surface wave region, which are respectively as follows: the first one is: 4.27Hz-7.49 Hz; a second bar: 9.83-10.84 Hz; and a third: 11.65Hz-13.73 Hz; fourth, the method comprises the following steps: 14.52Hz-15.51 Hz. The total width of the band gap is 7.3 Hz.
As shown in FIG. 5, the transmission spectrum of the seismic metastructure designed by the present invention is given. When rayleigh waves are excited in the Γ X direction at a distance of 40m from the seismic metasoma, a transmission spectrum of the seismic metasoma composed of ten rows of nine circular piles of seismic metasoma cells. Wherein the attenuation region of the transmission spectrum is marked by the light grey area. It can be found that the attenuation region calculated from the transmission spectrum is substantially identical to the full band gap of the band structure. This shows that the seismic surface wave in the full band gap frequency range can be effectively controlled and attenuated by the low-frequency damping nine-round-pile seismic metamaterial structure designed by the invention.
In conclusion, the nine-round-pile seismic metastructure with low frequency damping designed by the invention has good damping performance. Compared with the existing energy dissipation, shock absorption and earthquake resistance modes, the energy dissipation, shock absorption and earthquake resistance device is simple in structure and strong in operability. Due to the characteristic of low-frequency band gap, the low-frequency seismic surface wave can be effectively controlled and attenuated when an earthquake occurs. This is of great importance for the protection of buildings, especially heavy building structures such as substations, historic buildings and the like.
Claims (4)
1. The utility model provides a nine round pile earthquake glume structures of low frequency shock attenuation which characterized in that: the earthquake metasoma structure is formed by extending an earthquake metasoma structure unit cell in two mutually perpendicular directions in a horizontal plane and is arranged on the periphery of a building foundation, wherein the earthquake metasoma structure unit cell comprises a first steel pile (1), a second steel pile (3), a first hollow concrete pile (2), a second hollow concrete pile (4) and a soil layer (5); the cross section of the soil layer (5) is square, and nine circular through holes are distributed on the soil layer; the four small circular through holes are respectively positioned in the centers of the four sides of the square and have equal center distances with the large circular through holes; the four small circular through holes are respectively positioned at four opposite corners of the square and have equal center spacing with the large circular through holes; the center distances of all the small circular through holes are equal; the first steel pile (1) and the first hollow concrete pile (2) are arranged in the middle of the large circular through hole; the second steel pile (3) and the second hollow concrete pile (4) are arranged between the eight small circular through holes.
2. The low-frequency damping nine-round-pile seismic metastructure according to claim 1, wherein: the first steel pile (1) and the second steel pile (3) are made of common carbon structural steel.
3. The low-frequency damping nine-round-pile seismic metastructure according to claim 1, wherein: C20-C30 plain concrete is selected as the first hollow concrete pile (2) and the second hollow concrete pile (4); the soil layer (5) is made of sandy soil.
4. The low-frequency damping nine-round-pile seismic metastructure according to claim 1, wherein: the sections of the first steel pile (1) and the second steel pile (3) are circular; the sections of the first hollow concrete pile (2) and the second hollow concrete pile (4) are both circular rings.
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| CN202011509994.1A CN112663684A (en) | 2020-12-19 | 2020-12-19 | Low-frequency damping nine-round-pile earthquake glume structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114108860A (en) * | 2021-11-26 | 2022-03-01 | 哈尔滨工程大学 | Damping unit cell with phononic crystal low-frequency filtering characteristic and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000001862A (en) * | 1998-06-16 | 2000-01-07 | Penta Ocean Constr Co Ltd | Foundation structure |
| CN105908770A (en) * | 2016-06-03 | 2016-08-31 | 河海大学 | Novel building vibration isolation base |
| CN110506144A (en) * | 2016-10-21 | 2019-11-26 | 帝国学院创新有限公司 | Earthquake protection structure |
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2020
- 2020-12-19 CN CN202011509994.1A patent/CN112663684A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000001862A (en) * | 1998-06-16 | 2000-01-07 | Penta Ocean Constr Co Ltd | Foundation structure |
| CN105908770A (en) * | 2016-06-03 | 2016-08-31 | 河海大学 | Novel building vibration isolation base |
| CN110506144A (en) * | 2016-10-21 | 2019-11-26 | 帝国学院创新有限公司 | Earthquake protection structure |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114108860A (en) * | 2021-11-26 | 2022-03-01 | 哈尔滨工程大学 | Damping unit cell with phononic crystal low-frequency filtering characteristic and preparation method thereof |
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Application publication date: 20210416 |
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