CN112554168B - Low-frequency damping square nine-hole pile earthquake glume structure - Google Patents
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- CN112554168B CN112554168B CN202011419692.5A CN202011419692A CN112554168B CN 112554168 B CN112554168 B CN 112554168B CN 202011419692 A CN202011419692 A CN 202011419692A CN 112554168 B CN112554168 B CN 112554168B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
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- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- 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
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Abstract
The invention discloses a low-frequency damping square nine-hole pile earthquake glume structure which mainly comprises a thin-wall steel pipe, a rubber column and a concrete layer. The structure is simple. The arrangement of the designed seismic metastructures can be arranged along the building in a segmented and annular manner according to the site environment and geological conditions of the building, so that the building is fully and effectively protected. The structure of the invention is a periodic structure designed based on a phononic crystal theory and has band gap characteristics. When a seismic surface wave comes, the seismic surface wave in the band gap range cannot pass through the designed structure. The device is arranged on the periphery of the building and is not connected with the building, and can shield the seismic surface waves remotely, thereby protecting the building. The earthquake glume structure designed by the invention is not directly connected with a building and is arranged outside the building at a certain distance from the building. Therefore, under a large earthquake, the deformation of the seismic metastructure does not affect the structure. Meanwhile, the seismic metastructure can effectively attenuate the seismic surface wave in the full band gap range, and the building is protected.
Description
Technical Field
The invention relates to a low-frequency damping square nine-hole pile seismic metasone structure, which is a new structure capable of effectively controlling and attenuating seismic surface waves.
Background
The earthquake activities in China are characterized by shallow earthquake sources, wide distribution, high frequency and high intensity, and are a country with serious earthquake disasters. The loss caused by an earthquake is mainly due to the collapse of buildings, thereby possibly causing property loss and casualties. There are various types of seismic waves generated by earthquakes, with the seismic surface waves causing the greatest damage to the structure. Surface waves have the characteristics of low frequency, high amplitude and difficult attenuation, and common control methods are difficult to control and attenuate seismic surface waves. The large number of seismic damages indicates that the frequency spectrum of the seismic wave peak causing the destruction of surface buildings is around 2 Hz. In practice, most buildings correspond to resonant frequencies in the range of 2-10 Hz. Therefore, the seismic surface wave in the range of 2-10Hz has great damage to common buildings and seriously affects the personal safety of residents. The seismic metastructure is a periodic structure based on a phononic crystal theory and has a band gap characteristic. In the band gap frequency range, seismic waves cannot penetrate through a seismic metastructure, so that a new way is provided for seismic protection. The invention uses the principle of phononic crystal to control mechanical waves, adopts concrete, steel pipes and rubber to form a damping structure, and realizes the control and attenuation of seismic waves.
The frequency modulation shock absorption is one of common building anti-seismic measures, and the frequency modulation shock absorption method can be divided into three methods of active, semi-active and hybrid control according to the adopted means. The active control stability is poor, the influence factors are more, and the broadband damping effect is poor. And semi-active control has strong limitations. Also, this seismic method is difficult to control and isolate low frequency surface waves. Therefore, the seismic isolation and reduction structure is simple in structure and strong in adaptability, can effectively control and attenuate low-frequency seismic surface waves, and has important significance for protecting urban buildings and other structures sensitive to vibration, such as electronic factories, nuclear power plants, ancient buildings, precise laboratories and the like.
Disclosure of Invention
The invention discloses a low-frequency damping square nine-hole pile seismic metastructure and relates to a seismic metastructure for attenuating seismic surface waves. The square nine-hole pile seismic metastructure aims at providing the square nine-hole pile seismic metastructure which can attenuate seismic surface waves in all directions and at multiple angles, protect buildings, effectively reduce seismic disasters and reduce the post-disaster repair and maintenance cost of the buildings.
The invention relates to a low-frequency damping square nine-hole pile seismic metasoma structure, which is designed on the periphery of a building foundation and is characterized in that: the concrete hollow structure comprises a first hollow steel pipe 1, a second hollow steel pipe 2, a third hollow steel pipe 3, a fourth hollow steel pipe 4, a fifth hollow steel pipe 5, a sixth hollow steel pipe 6, a seventh hollow steel pipe 7, an eighth hollow steel pipe 8, a ninth hollow steel pipe 9, a rubber column 10 and a concrete layer 11. The first hollow steel tube 1, the second hollow steel tube 2, the third hollow steel tube 3, the fourth hollow steel tube 4, the fifth hollow steel tube 5, the sixth hollow steel tube 6, the seventh hollow steel tube 7, the eighth hollow steel tube 8 and the ninth hollow steel tube 9 are all square structures, the rubber column 10 comprises nine through holes, the rubber column 10 is wrapped outside the nine hollow steel tubes, and the concrete layer 11 is enclosed outside the rubber column 10.
The outer side lengths of the first hollow steel pipe 1, the second hollow steel pipe 2, the third hollow steel pipe 3, the fourth hollow steel pipe 4, the fifth hollow steel pipe 5, the sixth hollow steel pipe 6, the seventh hollow steel pipe 7, the eighth hollow steel pipe 8 and the ninth hollow steel pipe 9 are all 0.40m, the inner side lengths are 0.27m and the heights are 20m, and hot-rolled seamless steel pipes are adopted. The side length of the rubber column 6 is 1.6m, the height is 20m, and industrial rubber is selected. The outer side length of the concrete layer 7 is 2m, the inner side length is 1.6m, the height is 20m, and C20-C40 plain concrete is selected.
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 seismic metastructure formed by extension of the structural unit cells is not less than the size of a building foundation.
The technical scheme of the invention is as follows:
a low-frequency damping square nine-hole pile earthquake metastructure is formed by extending designed earthquake metastructure unit cells along two vertical 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 the seismic surface wave within the range of 2-10Hz, so that the building is protected from being damaged by the seismic surface wave.
When the seismic surface wave comes, the nine-hole hollow steel pipe in the seismic metasoma unit cell, the unit cell and the unit cell vibrate, and the combined seismic metasoma structure can generate a band gap, so that the seismic surface wave is effectively controlled and attenuated, and the building is protected.
The seismic glume-like structural unit cell designed by the invention consists of a first hollow steel pipe 1, a second hollow steel pipe 2, a third hollow steel pipe 3, a fourth hollow steel pipe 4, a fifth hollow steel pipe 5, a sixth hollow steel pipe 6, a seventh hollow steel pipe 7, an eighth hollow steel pipe 8, a ninth hollow steel pipe 9, a rubber column 10 and a concrete layer 11. Nine hollow steel pipes are respectively embedded into the rubber column 10 in sequence according to specific positions, and the outer walls of the steel pipes are tightly bonded with rubber. And a square hollow concrete column 11 is additionally arranged on the outer side of the rubber layer 10, so that the outer side of the rubber layer is tightly connected with the inner side of the concrete column.
The cross sections of the nine hollow steel pipes and the concrete layer 11 are both hollow and square, and the cross section of the rubber column (10) is nine-hole square.
The axes of the nine hollow steel pipes, the rubber column 10 and the concrete layer 11 are superposed.
Nine hollow steel pipes, the rubber column 10 and the concrete layer 11 have the same height, and the upper surface and the lower surface are on the same horizontal plane.
The low-frequency damping square nine-hole pile seismic metastructure designed by the invention is prepared by adopting different materials.
The materials of the low-frequency damping square nine-hole pile seismic metastructure designed by the invention comprise concrete, rubber and steel. Referring to fig. 2 and 3, the concrete density ρ of the concrete layer1=2500 kg/m3Young's modulus E1=4×1010Pa; poisson ratio gamma1= 0.2; rubber density of rubber column rho2=1300 kg/m3Young's modulus E2=1.02×105Pa; poisson ratio gamma2= 0.47; steel Density rho of hollow Steel pipe3=7850 kg/m3Young's modulus E3=2.1×1011Pa; poisson ratio gamma3= 0.3; three materials.
Compared with a frequency modulation damping control method, the method has the following advantages:
1) effectively control and attenuate low frequency seismic surface waves. The square nine-hole seismic metastructure designed by the invention can effectively control and attenuate seismic surface waves within the range of 2-10Hz and can effectively protect various buildings with resonance frequency within the range.
2) The designed seismic metastructure can have different purposes. In addition to effective control and attenuation of seismic surface waves in the 10Hz range, effective attenuation is provided for all surface acoustic waves that may occur in the 2-10Hz range.
3) The structure is simple. The invention relates to an earthquake metastructure which mainly comprises a hollow steel pipe, a rubber column and a concrete protective layer. The structure is simple.
4) Can be applied to various buildings in different areas and under different site conditions. According to parameters such as the field of the region and the height of the protected building, the size parameters of all components of the seismic metastructure can be adjusted, so that the seismic metastructure is applied to various geological conditions and different buildings.
5) The materials are common, the low-frequency damping square nine-hole pile seismic metasoma structure designed by the invention adopts three materials, namely steel, rubber and concrete. These materials are common in building construction and are readily available.
6) The building is protected in a full range and multiple angles. The arrangement of the designed seismic metastructures can be arranged along the building in a segmented and annular manner according to the site environment and geological conditions of the building, so that the building is fully and effectively protected.
7) Remotely shielding the seismic surface waves. The structure of the invention is a periodic structure designed based on a phononic crystal theory and has band gap characteristics. When a seismic surface wave comes, the seismic surface wave in the band gap range cannot pass through the designed structure. The shielding device is arranged on the periphery of the building and is not connected with the building, and can shield the seismic surface waves remotely, thereby protecting the building.
8) The earthquake glume structure designed by the invention is not directly connected with a building and is arranged outside the building at a certain distance from the building. Under the condition of large earthquake, the deformation of the earthquake metamaterial structure does not influence the structure. Meanwhile, the seismic metastructure can effectively attenuate the seismic surface wave in the full band gap range, and the building is protected.
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 wide-band-gap square nine-hole pile seismic metasequoia unit cell provided by the invention.
Fig. 3 is a top view of a low-frequency wide-band-gap square nine-hole pile seismic metasoma unit cell provided by the invention.
Fig. 4 is a diagram of an energy band structure of a low-frequency wide-band-gap square nine-hole pile seismic metastructure provided by the invention.
Fig. 5 is a transmission spectrum of a seismic metastructure consisting of ten rows of square nine-hole pile seismic metastructures when rayleigh waves are excited in the Γ X direction, provided by the present invention.
Wherein: 1. a first hollow steel pipe; 2. a second hollow steel pipe; 3. a third hollow steel pipe; 4. a fourth hollow steel pipe; 5. a fifth hollow steel pipe; 6. a sixth hollow steel pipe; 7. a seventh hollow steel pipe and 8. an eighth hollow steel pipe; 9. a ninth hollow steel pipe; 10. a rubber column; 11. and a concrete layer.
Detailed Description
The invention is described in detail below with reference to the attached drawing figures: the low-frequency damping square nine-hole pile earthquake glume structure comprises a first hollow steel pipe 1, a second hollow steel pipe 2, a third hollow steel pipe 3, a fourth hollow steel pipe 4, a fifth hollow steel pipe 5, a sixth hollow steel pipe 6, a seventh hollow steel pipe 7, an eighth hollow steel pipe 8, a ninth hollow steel pipe 9, a rubber column 10 and a concrete layer 11.
First, a rubber column having a prepared hole, which is 2cm larger than the cross-sectional area of the square steel pipe column, is installed. The interface centroid of the rubber column is used as the center, a coordinate system is established at the section, the preformed holes are from top to bottom, and the coordinates of the central positions of the first row of three holes are respectively as follows: (-0.5 m,0.5 m) (0, 0.5 m) (0.5 m ); the coordinates of the central positions of the three holes in the second row are respectively as follows: (-0.5 m, 0) (0, 0) (0.5 m, 0); the coordinates of the center of the third row of three holes are respectively as follows: nine points (-0.5 m ) (0, -0.5 m) (0.5 m, -0.5 m).
After the rubber columns are arranged, nine hollow steel pipes are sequentially embedded into the reserved holes of the rubber columns respectively. Embedding the first hollow steel pipe 1 into the rubber column 10, wherein the centroid of the first hollow steel pipe 1 is coincided with the position of (0, 0.5 m), repeating the steps, and the centroid of the second hollow steel pipe 2 is coincided with the position of (0.5 m ); the centroid of the third hollow steel tube 3 is coincided with the position of (0.5 m, 0); the 4-shaped center of the fourth hollow steel pipe is superposed with the position of (0.5 m, -0.5 m); the centroid of the fifth hollow steel pipe 5 coincides with the position of (0, 0); the centroid of the sixth hollow steel pipe 6 is coincided with the position of (0 to-0.5 m); the centroid of the seventh hollow steel tube 7 is coincided with the position (-0.5 m ); the 8-shaped center of the eighth hollow steel pipe is superposed with the position of (-0.5 m, 0); the centroid of the ninth hollow steel tube 9 coincides with the position (-0.5 m,0.5 m). When the prepared hole is too large, the prepared hole can be filled with resin to ensure the close fit between the hollow steel pipe and the rubber.
After that, outside the rubber column 10, a concrete layer 11 is provided. The outer part of the rubber column 10 is closely attached to the inner part of the concrete layer 11.
The upper and lower surfaces of the hollow steel pipe, the rubber layer 10 and the concrete layer 11 are respectively parallel and level, and the heights of the hollow steel pipe, the rubber layer and the concrete layer are equal.
And after finishing a seismic metastructure, arranging the seismic metastructure unit cell below the ground surface at the periphery of the building. And repeating the steps, wherein the quantity of the manufactured seismic metasoma unit cells can be arranged along the circumferential direction of the building.
Referring to fig. 2 and 3, the low-frequency damping square nine-hole pile seismic metasoma structure comprises a first hollow steel pipe 1, a second hollow steel pipe 2, a third hollow steel pipe 3, a fourth hollow steel pipe 4, a fifth hollow steel pipe 5, a sixth hollow steel pipe 6, a seventh hollow steel pipe 7, an eighth hollow steel pipe 8 and a ninth hollow steel pipe 9, wherein the outer side length is 0.40m, the inner side length is 0.27m, the height is 20m, and hot-rolled seamless steel pipes are adopted. The side length of the rubber column 10 is 1.6m, the height is 20m, and industrial rubber is selected. The outer side length of the concrete layer 11 is 2m, the inner side length is 1.6m, the height is 20m, and C20-C40 plain concrete is selected.
And after finishing the earthquake metasoma, arranging the earthquake metasoma unit cell below the soil around the building. And repeating the steps to manufacture the number of the seismic metasoma unit cells until the number of the seismic metasoma unit cells can be arranged along the circumferential direction of the building. Please refer to fig. 1 for arrangement positions.
The specific material parameters are as follows:
concrete: density p1=2500 kg/m3Young's modulus E1=4×1010Pa; poisson ratio gamma1=0.2；
Rubber: density p2=1300 kg/m3Young's modulus E2=1.02×105Pa; poisson ratio gamma2=0.47；
Hollow steel column: density p3=7850 kg/m3Young's modulus E3=2.1×1011Pa; poisson ratio gamma3=0.3；
Referring to fig. 4, the structure has a band gap in the range of 2-10Hz, and the light gray region is the full band gap range of the band structure. In the attenuation seismic surface wave region regulated and controlled by the seismic metastructure designed by the invention, five full band gaps are found and are respectively positioned as follows: the first one is: 2.19Hz-3.72 Hz; a second strip: 4.85Hz-5.82 Hz; and a third: 6.61Hz-6.85 Hz.
Please refer to fig. 5, wherein the light gray area is the attenuation region of the calculated transmission spectrum. When the surface wave is excited along the direction of gamma, the range of a transmission spectrum attenuation area can completely cover the range of 2-10Hz by calculating the seismic metastructure transmission spectrum consisting of ten rows of square nine-hole pile seismic metastructure unit cells. The method also shows that the designed seismic metastructure can effectively protect various buildings with the resonance frequency within the full band gap frequency range.
In conclusion, the low-frequency damping square nine-hole pile seismic metastructure designed by the invention has the characteristic of low-frequency band gap, so that seismic surface waves in the frequency range of the full band gap can be effectively controlled and attenuated, and the seismic metastructure has good damping performance and the function of protecting buildings.
Claims (2)
1. The utility model provides a square nine-hole stake earthquake metasoma structure of low frequency shock attenuation which characterized in that: the square nine-hole pile seismic metasoma is formed by continuously extending designed seismic metasoma unit cells in two mutually perpendicular directions in a horizontal plane; the square nine-hole pile seismic metastructure is arranged below the ground surface at the periphery of a building foundation and is annularly and sectionally arranged along the building in a certain range, and the band gap characteristic of a periodic structure is utilized to attenuate seismic surface waves within the range of 2-10Hz and protect the building from being damaged by the seismic surface waves; when the seismic surface wave comes, the nine-hole hollow steel pipe in the single cell of the seismic metasoma structure, the single cell and the single cell vibrate, and the combined seismic metasoma structure can generate band gaps, so that the seismic surface wave is effectively controlled and attenuated, and the building is further protected;
the seismic glume-structure unit cell consists of a first hollow steel pipe (1), a second hollow steel pipe (2), a third hollow steel pipe (3), a fourth hollow steel pipe (4), a fifth hollow steel pipe (5), a sixth hollow steel pipe (6), a seventh hollow steel pipe (7), an eighth hollow steel pipe (8), a ninth hollow steel pipe (9), a rubber column (10) and a concrete layer (11); nine hollow steel pipes are respectively embedded into the rubber column (10) in sequence according to specific positions, the nine hollow steel pipes are arranged according to a square shape, and the outer walls of the steel pipes are tightly bonded with the rubber column; a square hollow concrete layer (11) is additionally arranged on the outer side of the rubber column (10) to ensure that the outer side of the rubber column is tightly connected with the inner side of the concrete layer;
the rubber column comprises a rubber column body, wherein a first hollow steel pipe (1), a second hollow steel pipe (2), a third hollow steel pipe (3), a fourth hollow steel pipe (4), a fifth hollow steel pipe (5), a sixth hollow steel pipe (6), a seventh hollow steel pipe (7), an eighth hollow steel pipe (8) and a ninth hollow steel pipe (9) are all square structures, the rubber column (10) comprises nine through holes, the rubber column body (10) is wrapped outside the nine hollow steel pipes, and a concrete layer (11) is enclosed outside the rubber column body (10);
the outer side lengths of the first hollow steel pipe (1), the second hollow steel pipe (2), the third hollow steel pipe (3), the fourth hollow steel pipe (4), the fifth hollow steel pipe (5), the sixth hollow steel pipe (6), the seventh hollow steel pipe (7), the eighth hollow steel pipe (8) and the ninth hollow steel pipe (9) are all 0.40m, the inner side length is 0.27m, the height is 20m, and hot-rolled seamless steel pipes are adopted; the side length of the rubber column (10) is 1.6m, the height is 20m, and industrial rubber is selected; the outer edge of the concrete layer (11) is 2m long, the inner edge is 1.6m long, the height is 20m, and C20-C40 plain concrete is selected;
the cross sections of the first hollow steel pipe (1), the second hollow steel pipe (2), the third hollow steel pipe (3), the fourth hollow steel pipe (4), the fifth hollow steel pipe (5), the sixth hollow steel pipe (6), the seventh hollow steel pipe (7), the eighth hollow steel pipe (8), the ninth hollow steel pipe (9) and the concrete layer (11) are all hollow squares, and the cross section of the rubber column (10) is a nine-hole square;
the structure is characterized by comprising a structure consisting of a first hollow steel pipe (1), a second hollow steel pipe (2), a third hollow steel pipe (3), a fourth hollow steel pipe (4), a fifth hollow steel pipe (5), a sixth hollow steel pipe (6), a seventh hollow steel pipe (7), an eighth hollow steel pipe (8) and a ninth hollow steel pipe (9), wherein the axes of three parts, namely a rubber column (10) and a concrete layer (11), are superposed;
the structure that first hollow steel pipe (1), second hollow steel pipe (2), third hollow steel pipe (3), fourth hollow steel pipe (4), fifth hollow steel pipe (5), sixth hollow steel pipe (6), seventh hollow steel pipe (7), eighth hollow steel pipe (8), ninth hollow steel pipe (9) are constituteed, and rubber column (10) and concrete layer (11) triplex height are the same, and triplex upper surface, lower surface all are on same horizontal plane.
2. The low-frequency damping square nine-hole-pile seismic metastructure according to claim 1, wherein: concrete density rho of concrete layer1=2500 kg/m3Young's modulus E1=4×1010Pa, Poisson's ratio gamma1= 0.2; rubber density of rubber column rho2=1300 kg/m3Young's modulus E2=1.02×105Pa, Poisson's ratio gamma2= 0.47; steel Density of hollow Steel pipe3=7850 kg/m3Young's modulus E3=2.1×1011Pa, Poisson's ratio gamma3=0.3。
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000080819A (en) * | 1998-09-03 | 2000-03-21 | Shimizu Corp | Fitting structure for base isolation device |
| CN111206623A (en) * | 2020-01-16 | 2020-05-29 | 西安建筑科技大学 | Diamond seismic metamaterial with low-frequency damping characteristic |
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- 2020-12-06 CN CN202011419692.5A patent/CN112554168B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000080819A (en) * | 1998-09-03 | 2000-03-21 | Shimizu Corp | Fitting structure for base isolation device |
| CN111206623A (en) * | 2020-01-16 | 2020-05-29 | 西安建筑科技大学 | Diamond seismic metamaterial with low-frequency damping characteristic |
Non-Patent Citations (1)
| Title |
|---|
| 地震超材料的应用与研究进展;石南南等;《功能材料》;20190930(第9期);第09019-09026页 * |
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