Tension-resistant energy dissipation seismic isolation bearing

Abstract

The application discloses a kind of anti-tension energy dissipation isolation bearing, belong to building structure seismic mitigation and isolation technical field, including a support body and two more than the anti-tension energy dissipation steel plate installed in the side of support body;Support body includes upper connecting steel sheet, lower connecting steel sheet and rubber unit;Rubber unit is columnar structure, its upper end surface and lower end surface are connected with upper connecting steel sheet and lower connecting steel sheet respectively relative arrangement, and the side of upper connecting steel sheet and the side of lower connecting steel sheet are one by one relative;Each anti-tension energy dissipation steel plate is equipped with several steel strips;Anti-tension energy dissipation steel plate uses mild steel material;Each anti-tension energy dissipation steel plate, its upper end is installed in the side of upper connecting steel sheet, lower end is installed in the side of lower connecting steel sheet.The application utilizes anti-tension energy dissipation steel plate in support to provide support anti-tension bearing mechanism, simultaneously utilize steel yield dissipate certain seismic input energy, reduce the interlayer displacement of isolation layer, realize the anti-tension energy dissipation characteristic of isolation bearing.

Description

Technical Field

[0001] This invention belongs to the field of seismic isolation technology for building structures, and specifically relates to a tensile energy-dissipating seismic isolation bearing. Background Technology

[0002] Seismic isolation bearings are typically made of flexible materials such as rubber, characterized by low horizontal stiffness and high vertical stiffness. By arranging seismic isolation bearings between the building foundation or the substructure and the superstructure, the natural period of the overall structure can be extended, effectively reducing the seismic forces transmitted to the superstructure, thereby mitigating the seismic response and damage to the superstructure and ensuring that the building's functions are as unaffected as possible by earthquakes.

[0003] Currently, seismic isolation bearings have been widely used in engineering projects in my country, and some projects have withstood actual earthquakes, demonstrating good seismic isolation effects. Furthermore, the "Regulations on Seismic Management of Construction Projects" issued by the state encourages the adoption of seismic isolation and damping technologies in buildings such as schools, kindergartens, and hospitals. Therefore, seismic isolation bearings have broad development prospects in my country.

[0004] Seismic isolation bearings are typically made of rubber units bonded to connecting steel plates. However, rubber materials have low tensile stiffness and bearing capacity; their design tensile stress should not exceed 1 MPa, which is far below the compressive design strength. For high-rise buildings, when the superstructure experiences a large overturning moment under seismic or wind loads, the seismic isolation bearings may have insufficient tensile bearing capacity.

[0005] Therefore, the insufficient tensile capacity of seismic isolation bearings is a major problem restricting their widespread application in high-rise buildings. In order to improve the tensile performance of seismic isolation bearings and reduce the lateral displacement of the isolation layer, it is necessary to develop a new and simple tensile energy-dissipating seismic isolation bearing. Summary of the Invention

[0006] In view of this, the present invention provides a tensile energy-dissipating seismic isolation bearing, which utilizes the tensile energy-dissipating steel plate in the bearing to provide the tensile bearing mechanism, and at the same time utilizes the yielding of steel to dissipate a certain amount of seismic input energy, thereby reducing the inter-story displacement of the isolation layer and realizing the tensile energy-dissipating characteristics of the seismic isolation bearing.

[0007] This invention is achieved through the following technical solution:

[0008] A tensile energy-dissipating seismic isolation bearing includes: a bearing body and two or more tensile energy-dissipating steel plates installed on the side of the bearing body;

[0009] The support body includes an upper connecting steel plate, a lower connecting steel plate, and a rubber unit;

[0010] The rubber unit is a columnar structure, with an upper connecting steel plate connected to its upper end face and a lower connecting steel plate connected to its lower end face. The upper connecting steel plate and the lower connecting steel plate are arranged opposite to each other.

[0011] The upper connecting steel plate and the lower connecting steel plate are plate-shaped structures of the same size, and the sides of the upper connecting steel plate and the sides of the lower connecting steel plate are opposite each other.

[0012] Each of the tensile energy-consuming steel plates is provided with several steel bars; the tensile energy-consuming steel plates are made of mild steel; each of the tensile energy-consuming steel plates is perpendicular to the plane where the upper connecting steel plate and the lower connecting steel plate are located; the upper end of the tensile energy-consuming steel plate is installed on one side of the upper connecting steel plate, and the lower end is installed on one side of the lower connecting steel plate;

[0013] The tensile energy-dissipating seismic isolation bearing is installed on the main structure to be subjected to vibration reduction.

[0014] Furthermore, each of the tensile energy-consuming steel plates is composed of an integrally formed upper connecting strip, a lower connecting strip, and several steel strips, and let the steel strips be steel strip A;

[0015] Several steel bars A are evenly spaced between the upper connecting bar and the lower connecting bar.

[0016] Furthermore, each of the tensile energy-consuming steel plates is composed of several independent steel bars, let the steel bars be steel bars B;

[0017] Each of the steel bars B is an I-beam.

[0018] Furthermore, each of the steel bars B has a through hole machined at its upper and lower ends; the upper and lower ends of the steel bars B are respectively connected to the upper connecting steel plate and the lower connecting steel plate by screws.

[0019] Each of the steel bars B can rotate around the threaded post through a through hole.

[0020] Furthermore, both the upper and lower connecting steel plates are square; when a tensile energy-dissipating steel plate is installed on each of the four sides of the support body, the thickness t, width b, length h, and number n of each steel bar on each tensile energy-dissipating steel plate simultaneously satisfy the following:

[0021] 4ntbf y >F;

[0022]

[0023] In the formula, 4ntbf y The tensile bearing capacity of the tensile energy dissipation support, F represents the lateral stiffness of the four tensile energy-dissipating steel plates installed on the bearing body in a horizontal lateral displacement direction, F represents the tensile design value of the seismic isolation bearing, K represents the lateral stiffness of the bearing body, fy represents the tensile strength of the tensile energy-dissipating steel plate, and E represents the elastic modulus of the tensile energy-dissipating steel plate.

[0024] Furthermore, the support body after installing the tensile energy-dissipating steel plate is installed on the main structure; both the upper connecting steel plate and the lower connecting steel plate are squares with a side length of a.

[0025] The edge distance S1 between the end of one side of the upper connecting steel plate and the lower connecting steel plate and the end of the tensile energy dissipation plate is greater than 1. And S1 is greater than 10cm.

[0026] Furthermore, after the support body is installed on the main structure, a tensile energy-dissipating steel plate is installed; both the upper connecting steel plate and the lower connecting steel plate are squares with a side length of a.

[0027] The edge distance S1 between the end of one side of the upper connecting steel plate and the lower connecting steel plate and the end of the tensile energy dissipation plate is greater than three times the screw diameter d, and S1 is greater than twice the screw length.

[0028] Beneficial effects:

[0029] (1) A tensile energy-dissipating seismic isolation bearing of the present invention has two or more tensile energy-dissipating steel plates respectively installed on the side of the bearing body, which can reduce the lateral displacement of the seismic isolation layer. The tensile energy-dissipating seismic isolation bearing can not only improve the tensile performance of the bearing body, but also dissipate a certain amount of seismic input energy through the yielding of the tensile energy-dissipating steel plates, thereby playing the role of tensile energy dissipation. Each tensile energy-dissipating steel plate is provided with several steel bars, and the tensile energy-dissipating steel plate is made of soft steel. When the upper connecting steel plate on the tensile energy-dissipating seismic isolation bearing is displaced relative to the lower connecting steel plate in a horizontal direction, the two opposing tensile energy-dissipating steel plates can deform. The setting of steel bars can reduce the lateral stiffness of the tensile energy-dissipating bearing body, thereby reducing the influence of lateral stiffness on the seismic isolation effect. Furthermore, the tensile energy-dissipating steel plates are easy to disassemble and replace when damaged during use.

[0030] (2) A tensile energy dissipation seismic isolation bearing of the present invention, wherein each tensile energy dissipation steel plate is composed of several independent steel bars B, and the upper and lower ends of the steel bars B are machined with a through hole, which can rotate around the threaded column. The structure can further reduce the lateral stiffness of the tensile energy dissipation bearing and ensure its seismic isolation effect.

[0031] (3) In a tensile energy-dissipating seismic isolation bearing of the present invention, the thickness t, width b, length h, and number n of each steel bar on each tensile energy-dissipating steel plate simultaneously satisfy 4ntbf. y >F and While ensuring that the lateral stiffness of the tensile energy-dissipating steel plate does not affect the seismic isolation effect of the support body, the tensile performance is improved to meet different tensile force requirements.

[0032] (4) In a tensile energy-dissipating seismic isolation bearing of the present invention, both the upper connecting steel plate and the lower connecting steel plate are square with a side length of a. The bearing body, after installing the tensile energy-dissipating steel plate, is installed on the main structure. At this time, the side distance S1 is greater than 1. Furthermore, S1 is greater than 10cm. The design method can avoid the tensile energy-dissipating steel plate affecting the installation of the support body. After the support body is installed on the main structure, the tensile energy-dissipating steel plate is installed. At this time, the edge distance S1 is greater than three times the screw diameter d, and S1 is greater than twice the screw length. The design method can avoid the screws installed on two adjacent sides from affecting each other and ensure the stability of the connection of the tensile energy-dissipating steel plate. Attached Figure Description

[0033] Figure 1 This is a structural schematic diagram of a tensile energy-dissipating seismic isolation bearing according to the present invention;

[0034] Figure 2 This is a schematic diagram of the support body of the present invention;

[0035] Figure 3 This is a top view of the support body of the present invention;

[0036] Figure 4 This is a front view of the tensile energy-dissipating steel plate of the present invention;

[0037] Figure 5 This is a schematic diagram showing the deformation of the tensile energy-dissipating steel plate of the present invention under horizontal lateral displacement of the support;

[0038] Figure 6 This is a schematic diagram of the tensile energy-dissipating steel bar seismic isolation bearing of the present invention;

[0039] Figure 7 This is a schematic diagram of the tensile energy-dissipating steel bar B of the present invention under horizontal lateral displacement of the support;

[0040] Among them, 1-support body, 2-tensile energy-consuming steel plate, 3-upper connecting steel plate, 4-lower connecting steel plate, 5-rubber unit, 6-steel bar B. Detailed Implementation

[0041] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0042] Example 1:

[0043] This embodiment provides a tensile energy-dissipating seismic isolation bearing, such as Figure 1 As shown, it includes: a support body 1 and two or more tensile energy-dissipating steel plates 2; the two or more tensile energy-dissipating steel plates 2 are installed on the side of the support body 1; in this embodiment, the tensile energy-dissipating steel plates 2 are preferably four;

[0044] Four tensile energy-dissipating steel plates 2 are installed around the support body 1;

[0045] like Figure 2 and Figure 3 As shown, the support body 1 consists of an upper connecting steel plate 3, a lower connecting steel plate 4, and a rubber unit 5. The rubber unit 5 is a columnar structure, with the upper connecting steel plate 3 connected to its upper end and the lower connecting steel plate 4 connected to its lower end. The upper connecting steel plate 3 and the lower connecting steel plate 4 are arranged opposite to each other. The upper connecting steel plate 3 and the lower connecting steel plate 4 are square plate structures of the same size. The sides of the upper connecting steel plate 3 and the lower connecting steel plate 4 are opposite to each other. A row of threaded holes perpendicular to the surface is machined on the side of the upper connecting steel plate 3 and the lower connecting steel plate 4. The threaded holes of the upper connecting steel plate 3 and the lower connecting steel plate 4 on the same side correspond one-to-one. The spacing S2 between each row of threaded holes meets the requirements of the "Steel Structure Design Standard" GB50017.

[0046] like Figure 4 As shown, each of the tensile energy-consuming steel plates 2 is composed of an integrally formed upper connecting strip, a lower connecting strip, and several steel strips A; the several steel strips A are evenly spaced at a set distance and distributed between the upper connecting strip and the lower connecting strip; each of the tensile energy-consuming steel plates 2 is perpendicular to the plane where the upper connecting plate 3 and the lower connecting plate 4 are located; each of the upper connecting strip and the lower connecting strip is machined with a row of threaded holes; the threaded holes on the upper connecting strip of each of the tensile energy-consuming steel plates 2 correspond one-to-one with the threaded holes on the lower connecting strip; The threaded holes on the upper and lower connecting strips of each of the tensile energy-dissipating steel plates 2 correspond one-to-one with the threaded holes on one side of the upper connecting steel plate 3 and the lower connecting steel plate 4; the upper and lower connecting strips of each of the tensile energy-dissipating steel plates 2 are fixed to the threaded holes on the same side of the upper connecting steel plate 3 and the lower connecting steel plate 4 by threaded connection; in this embodiment, the number of steel strips on each tensile energy-dissipating steel plate 2 is the same as the number of threaded holes on the upper and lower connecting strips; the tensile energy-dissipating steel plate 2 is made of mild steel.

[0047] like Figure 5 As shown, when the support body 1 undergoes horizontal lateral displacement, the upper connecting steel plate 3 is displaced by a displacement u in the horizontal direction relative to the lower connecting steel plate 4. At this time, the tensile energy dissipation steel plate 2 also deforms in the horizontal direction.

[0048] In each of the tensile energy-dissipating steel plates 2, the thickness t, width b, length h, and number n of each steel bar A simultaneously satisfy the following:

[0049] 4ntbf y >F;

[0050]

[0051] In the formula, 4ntbf y The tensile bearing capacity of the tensile energy dissipation support, F is the lateral stiffness of the four tensile energy-dissipating steel plates installed on the bearing body (1) in a horizontal lateral displacement direction, F is the tensile design value of the tensile energy-dissipating seismic isolation bearing, K is the lateral stiffness of the bearing body 1, and f is the tensile stiffness of the four tensile energy-dissipating steel plates installed on the bearing body (1) in a horizontal lateral displacement direction. y E represents the tensile strength of the tensile energy-dissipating steel plate 2, and E represents the elastic modulus of the tensile energy-dissipating steel plate 2.

[0052] When in use, the tensile energy-dissipating seismic isolation bearing needs to be installed on the main structure to be damped. The assembly method between the tensile energy-dissipating steel plate 2 and the bearing body 1 can be divided into two types. The first type involves connecting the tensile energy-dissipating steel plate 2 before the bearing body 1 is installed on the main structure. That is, the tensile energy-dissipating steel plate 2 is already connected to the bearing body 1 at the factory. This method can protect the bearing body 1 from deformation and damage during transportation and installation. Using the first method, it is necessary to ensure the installation space required for the upper connecting steel plate 3 and lower connecting steel plate 4 of the bearing body 1 to connect with the main structure. Therefore, when the side length of both the upper connecting steel plate 3 and lower connecting steel plate 4 is 'a', the edge distance S1 between the end of one side of the upper connecting steel plate 3 and lower connecting steel plate 4 and the end of the tensile energy-dissipating plate 2 is greater than... And S1 is greater than 10cm; the second method is to install the support body 1 on the main structure and then connect the tensile energy dissipation steel plate 2; when the second method is adopted, the edge distance S1 is greater than three times the screw diameter d (meeting the requirements of the "Steel Structure Design Standard" GB50017), and the edge distance S1 is greater than twice the screw length to avoid the screws installed on two adjacent sides from affecting each other.

[0053] Example 2:

[0054] This embodiment 2 provides a tensile energy-dissipating seismic isolation bearing. Based on embodiment 1, the tensile energy-dissipating steel plate 2 is composed of several independent steel bars B, each steel bar B being an I-beam. Each steel bar B has a through hole machined at its upper and lower ends. The upper and lower ends of each steel bar B are respectively connected by screws to two corresponding threaded holes on the upper connecting steel plate 3 and the lower connecting steel plate 4 on the same side. The diameter of the through hole on each steel bar B is slightly larger than the diameter of the screw thread, allowing the steel bar B to rotate around the threaded post. Figure 7 As shown, when the support body 1 undergoes horizontal lateral displacement, the threaded holes at the upper and lower ends of the steel bar B rotate around the screw; the lateral stiffness of the steel bar B is lower than that of the tensile energy-dissipating steel plate 2, so the use of the steel bar B can further reduce the influence of lateral stiffness on the seismic isolation effect.

[0055] In summary, the above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A tensile energy-dissipating seismic isolation bearing, characterized in that, include: A support body (1) and two or more tensile energy-dissipating steel plates (2) installed on the side of the support body (1); The support body (1) includes an upper connecting steel plate (3), a lower connecting steel plate (4), and a rubber unit (5); The rubber unit (5) is a columnar structure, with an upper connecting steel plate (3) connected to its upper end face and a lower connecting steel plate (4) connected to its lower end face. The upper connecting steel plate (3) and the lower connecting steel plate (4) are arranged opposite to each other. The upper connecting steel plate (3) and the lower connecting steel plate (4) are plate-shaped structures of the same size, and the sides of the upper connecting steel plate (3) and the sides of the lower connecting steel plate (4) are opposite to each other. The tensile energy-consuming steel plate (2) is made of mild steel; each of the tensile energy-consuming steel plates (2) is perpendicular to the plane where the upper connecting steel plate (3) and the lower connecting steel plate (4) are located; the upper end of the tensile energy-consuming steel plate (2) is installed on one side of the upper connecting steel plate (3), and the lower end is installed on one side of the lower connecting steel plate (4); The tensile energy-dissipating seismic isolation bearing is installed on the main structure to be subjected to vibration reduction; Each of the tensile energy-consuming steel plates (2) is composed of several independent steel bars, let the steel bars be steel bars B; Each of the steel bars B (6) is an I-beam plate; each of the steel bars B (6) has a through hole at its upper end and lower end respectively; the upper end and lower end of the steel bars B (6) are respectively connected to the upper connecting steel plate (3) and the lower connecting steel plate (4) by screws; Each of the steel bars B (6) can rotate around the threaded post through the through hole.

2. The tensile energy-dissipating seismic isolation bearing as described in claim 1, characterized in that, Both the upper connecting steel plate (3) and the lower connecting steel plate (4) are square; when a tensile energy-dissipating steel plate (2) is installed on each of the four sides of the support body (1), the thickness t, width b, length h and number n of each steel bar on each tensile energy-dissipating steel plate (2) simultaneously satisfy: ； ； In the formula, The tensile bearing capacity of the tensile energy dissipation seismic isolation bearing, The lateral stiffness of the four tensile energy-dissipating steel plates (2) installed on the bearing body (1) in a horizontal lateral displacement direction, F is the tensile design value of the seismic isolation bearing, K is the lateral stiffness of the bearing body (1), and f is the tensile stiffness of the four tensile energy-dissipating steel plates (2) installed on the bearing body (1). y E represents the tensile strength of the tensile energy-dissipating steel plate (2), and E represents the elastic modulus of the tensile energy-dissipating steel plate (2).

3. The tensile energy-dissipating seismic isolation bearing as described in claim 1, characterized in that, The support body (1) after the tensile energy dissipation steel plate (2) is installed on the main structure; the upper connecting steel plate (3) and the lower connecting steel plate (4) are both squares with a side length of a; The edge distance S1 between the end of one side of the upper connecting steel plate (3) and the lower connecting steel plate (4) and the end of the tensile energy dissipation steel plate (2) is greater than 1. And S1 is greater than 10cm.

4. The tensile energy-dissipating seismic isolation bearing as described in claim 1, characterized in that, The support body (1) is installed on the main structure and then the tensile energy-dissipating steel plate (2) is installed; the upper connecting steel plate (3) and the lower connecting steel plate (4) are both square with a side length of a; The edge distance S1 between the end of one side of the upper connecting steel plate (3) and the lower connecting steel plate (4) and the end of the tensile energy dissipation steel plate (2) is greater than three times the screw diameter d, and S1 is greater than twice the screw length.

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