A seismic isolation and damping collaborative steel-concrete composite structure for offshore platform

Abstract

This invention relates to the field of vibration reduction and provides a combined steel-concrete composite structure for seismic isolation and damping in offshore platforms. The structure includes seismic isolation bearings and a composite column mechanism. Multiple seismic isolation bearings are provided, all connected to the composite column mechanism, which is equipped with energy dissipation and vibration reduction components. This invention addresses the shortcomings of traditional passive reinforcement methods in structural design, which often result in weak adjustment capabilities under complex load conditions. The octagonal structure with a central column offers several advantages: the octagonal structure provides excellent spatial symmetry, allowing for more even distribution and dispersion of horizontal and vertical loads compared to conventional rectangular layouts. Under complex load conditions such as earthquakes and wind, the structure exhibits more rational stress distribution and stronger adaptability, effectively avoiding localized stress concentration and maintaining overall structural integrity.

Description

Technical Field

[0001] This invention relates to the field of vibration reduction technology, specifically to a combined steel-concrete composite structure for vibration isolation and damping in offshore platforms. Background Technology

[0002] Existing offshore platforms still primarily rely on traditional passive seismic resistance methods, dissipating seismic energy through the structure itself or additional devices. This approach has the following drawbacks: The structural system has a single seismic design approach, mainly relying on traditional passive reinforcement, which has a weak ability to adjust when faced with complex load conditions.

[0003] The means of ensuring load-bearing capacity are limited, mainly relying on the strength reserves of structural materials and the improvement of cross-sectional stiffness, without involving other key disaster resistance dimensions such as toughness optimization and energy dissipation.

[0004] Insufficient damage resistance under extreme coupling conditions makes the platform structure prone to local damage accumulation, failing to effectively maintain structural integrity and potentially affecting overall safety. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention aims to provide a seismic isolation and vibration damping combined steel-concrete composite structure for offshore platforms. To solve these problems, this invention employs the following technical solution: A combined steel-concrete composite structure for seismic isolation and damping in offshore platforms includes seismic isolation bearings and a composite column mechanism. Multiple seismic isolation bearings are provided, and all seismic isolation bearings are connected to the composite column mechanism. Energy dissipation and damping components are connected to the composite column mechanism.

[0006] Optionally, the seismic isolation bearing includes an upper connecting plate, a lower connecting plate, a rubber seismic isolation core, a vertical support mechanism, and an inclined support component; The vertical support mechanism includes spring two and telescopic rod two; The rubber vibration isolation core is connected by two or more vertical support mechanisms and an upper connecting plate. Spring 2 is connected between the upper connecting plate and the rubber vibration isolation core, and telescopic rod 2 is connected between the upper connecting plate and the rubber vibration isolation core. The rubber vibration isolation core is connected by two or more vertical support mechanisms and a lower connecting plate. Spring 2 is connected between the lower connecting plate and the rubber vibration isolation core, and telescopic rod 2 is connected between the lower connecting plate and the rubber vibration isolation core. The inclined support component includes a ring body and two or more inclined buffer mechanisms. The ring body is slidably connected to the rubber vibration isolation core. The inclined buffer mechanism includes an inclined bar, a slide block, a spring, a telescopic rod, and a connecting seat. The inclined bar is rotatably connected to the ring body. The inclined bar and the slide block are rotatably connected. The slide block is connected to the connecting seat through the telescopic rod and the slide block is connected to the connecting seat through the spring. Two diagonal support members are provided; In the upper inclined support component, the slide block is slidably connected to the upper connecting plate, and the connecting seat is fixedly connected to the upper connecting plate; In the lower inclined support component, the slide block is slidably connected to the lower connecting plate, and the connecting seat is fixedly connected to the lower connecting plate.

[0007] Optionally, the combined column mechanism includes a central column and two or more peripheral columns, with the central column connected to all peripheral columns, and each peripheral column having a seismic isolation bearing connected to its lower end, and the central column having a seismic isolation bearing connected to its lower end.

[0008] Optionally, the adjacent outer columns are connected by a stabilizing rod, a first diagonal rod, and a second diagonal rod, and both the first diagonal rod and the second diagonal rod are equipped with energy dissipation and vibration reduction components.

[0009] Optionally, the first diagonal bar and the second diagonal bar are arranged in an X-shape.

[0010] Optionally, the outer column and the central column are connected by a vibration damping mechanism, which includes a first connecting rod, a second connecting rod, and the energy dissipation and vibration reduction component. The first connecting rod is connected to the outer column, and the first connecting rod is connected to the second connecting rod through the energy dissipation and vibration reduction component. The second connecting rod is connected to the central column.

[0011] Optionally, a converging member is connected to the outer column, and the stabilizing rod, the first diagonal rod, the second diagonal rod, and the first connecting rod are all connected to the converging member.

[0012] Optionally, all the outer columns are arranged around the central column.

[0013] Optionally, both the upper connecting plate and the lower connecting plate are cylindrical in shape.

[0014] Optionally, both the upper connecting plate and the lower connecting plate are in the shape of a quadrangular prism.

[0015] The present invention has the following beneficial effects: Octagonal structure with central column: Advantages of overall layout: The octagonal structure has good spatial symmetry. Compared with the conventional rectangular layout, it can more evenly transfer and disperse horizontal and vertical loads. Under complex load conditions such as earthquakes and wind, the stress is more reasonable and the adjustment and adaptability are stronger. It can effectively avoid local stress concentration and help maintain the overall integrity of the structure. Active seismic isolation function of seismic isolation bearings: The seismic isolation bearings at the bottom are active seismic isolation devices, which can significantly reduce the transmission of seismic energy to the upper structure by extending the natural vibration period of the structure. This allows the structure to adapt to different seismic intensities through the deformation of the seismic isolation layer, significantly improving its adjustment capability and breaking through the limitations of traditional passive reinforcement. Damage isolation function of seismic isolation bearings: The seismic isolation bearings at the bottom concentrate the relative motion between the superstructure and the foundation under seismic action in the seismic isolation layer, which greatly reduces the seismic response of the superstructure, thereby reducing the damage to the superstructure. Especially under extreme coupling conditions, they can effectively isolate the transmission of damage to the upper platform structure. The advantages of this approach include "limited means of ensuring load-bearing capacity, mainly relying on the strength reserves of structural materials and the improvement of cross-sectional stiffness, without addressing other key disaster resistance dimensions such as toughness optimization and energy dissipation"; The X-shaped connection between diagonal braces 1 and 2 optimizes energy dissipation and stiffness: The energy dissipation and damping components are connected to diagonal braces 1 and 2, forming an X-shape, similar to a cross brace. This not only enhances the horizontal stiffness of the structure, but also efficiently transfers and dissipates energy through the coordinated work of the brace and the damper. While ensuring the load-bearing capacity, it optimizes the structural toughness and achieves multi-dimensional load-bearing protection of "stiffness-energy dissipation-toughness". Damage control function of energy dissipation and vibration damping components and cross supports: The connection between the energy dissipation and vibration damping components and the X-shaped structure serves as a pre-designed energy dissipation structure. Under extreme working conditions, the energy dissipation structure preferentially undergoes elastoplastic deformation to consume energy, guiding damage to concentrate on these replaceable energy dissipation components, avoiding damage accumulation in the main structure of the platform, and ensuring the overall structural integrity. Both the outer and central columns are concrete-filled steel tube columns, which have the following mechanical advantages: the steel tubes in the concrete-filled steel tube columns restrain the concrete, putting the concrete in a triaxial compression state, which greatly improves the compressive strength and ductility; at the same time, the concrete enhances the stability of the steel tubes. The two work together to improve the load-bearing capacity while optimizing the structural toughness through the plastic deformation of the components. The cross-shaped spatial nodes on the intersecting components have advantages in force transmission and ductility: the cross-shaped spatial nodes can achieve efficient transmission of forces in multiple directions, and the nodes themselves have good ductility. Under load, they can dissipate energy through plastic deformation of the nodes, avoiding brittle failure of the nodes. This optimizes the structural toughness at the node level and enriches the dimensions of load-bearing capacity assurance. It addresses the shortcomings of "insufficient damage resistance under extreme coupling conditions, easy accumulation of local damage in the platform structure, inability to effectively maintain structural integrity, and potential impact on overall safety"; Damage resistance of central columns, outer columns and star-shaped joints: The ductility of concrete-filled steel tubular columns and the plastic deformation capacity of star-shaped joints enable the structure to absorb energy through the deformation of components and joints under extreme coupled conditions, reduce brittle failure, effectively control the development of local damage, and maintain the overall safety of the structure. Attached Figure Description

[0016] The present invention will be further described with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the present invention. For those skilled in the art, other drawings can be obtained based on the following drawings without creative effort.

[0017] Figure 1 This is a structural schematic diagram of a shock-absorbing and isolation steel-concrete composite structure for offshore platforms according to the present invention; Figure 2 This is a schematic diagram of one embodiment of the seismic isolation bearing in this invention; Figure 3 This is a diagram showing the connection structure between the central column and the outer columns in this invention; Figure 4 This is a diagram showing the connection structure between adjacent outer columns in this invention; Figure 5 This is a schematic diagram of the structure of the first and second inclined rods of the present invention.

[0018] Reference numerals in the attached drawings: 1. Seismic isolation bearing; 2. Combined column mechanism; 3. Energy dissipation and damping component; 4. Upper connecting plate; 5. Lower connecting plate; 6. Rubber seismic isolation core; 7. Ring body; 8. Diagonal bar; 9. Slide seat; 10. Spring 1; 11. Telescopic rod 1; 12. Connecting seat; 13. Spring 2; 14. Telescopic rod 2; 15. Central column; 16. Outer column; 17. Stabilizing rod; 18. Diagonal rod 1; 19. Diagonal rod 2; 20. Connecting rod 1; 21. Connecting rod 2; 22. Intersecting component. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] In the description of this invention, it should be noted that the terms "vertical," "upper," "lower," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the addition of "a," "b," "c," and "d" after the component names is for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0021] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or a connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0022] like Figures 1-5 As shown, a combined steel-concrete composite structure for vibration isolation and damping in offshore platforms includes a seismic isolation bearing 1 and a composite column mechanism 2. Multiple seismic isolation bearings 1 are provided, and all seismic isolation bearings 1 are connected to the composite column mechanism 2. Energy dissipation and vibration reduction components 3 are connected to the composite column mechanism 2.

[0023] Preferably, the seismic isolation bearing 1 includes an upper connecting plate 4, a lower connecting plate 5, a rubber seismic isolation core 6, a vertical support mechanism, and an oblique support component; The vertical support mechanism includes spring 213 and telescopic rod 214; The rubber vibration isolation core 6 is connected to the upper connecting plate 4 by two or more vertical support mechanisms. Spring 2 13 is connected between the upper connecting plate 4 and the rubber vibration isolation core 6, and telescopic rod 2 14 is connected between the upper connecting plate 4 and the rubber vibration isolation core 6. The rubber vibration isolation core 6 is connected to the lower connecting plate 5 by two or more vertical support mechanisms. Spring 2 13 is connected between the lower connecting plate 5 and the rubber vibration isolation core 6, and telescopic rod 2 14 is connected between the lower connecting plate 5 and the rubber vibration isolation core 6. The inclined support component includes a ring body 7 and two or more inclined buffer mechanisms. The ring body 7 is slidably connected to the rubber vibration isolation core 6. The inclined buffer mechanism includes an inclined bar 8, a slide 9, a spring-10, a telescopic rod-11, and a connecting seat 12. The inclined bar 8 is rotatably connected to the ring body 7. The inclined bar 8 and the slide 9 are rotatably connected. The slide 9 is connected to the connecting seat 12 through the telescopic rod-11. The slide 9 is connected to the connecting seat 12 through the spring-10. Two diagonal support members are provided; In the upper inclined support component, the slide 9 is slidably connected to the upper connecting plate 4, and the connecting seat 12 is fixedly connected to the upper connecting plate 4; In the lower inclined support component, the slide 9 is slidably connected to the lower connecting plate 5, and the connecting seat 12 is fixedly connected to the lower connecting plate 5.

[0024] Preferably, the combined column mechanism 2 includes a central column 15 and two or more peripheral columns 16. The central column 15 is connected to all the peripheral columns 16, and each peripheral column 16 is connected to a seismic isolation bearing 1 at its lower end. The central column 15 is connected to a seismic isolation bearing 1 at its lower end.

[0025] Preferably, the adjacent outer columns 16 are connected by a stabilizing rod 17, a first inclined rod 18 and a second inclined rod 19, and both the first inclined rod 18 and the second inclined rod 19 are provided with energy dissipation and vibration reduction components 3.

[0026] Preferably, the first diagonal bar 18 and the second diagonal bar 19 are arranged in an X-shape.

[0027] Preferably, the outer column 16 and the central column 15 are connected by a vibration damping mechanism, which includes a first connecting rod 20, a second connecting rod 21 and the energy dissipation and vibration reduction component 3. The first connecting rod 20 is connected to the outer column 16, and the first connecting rod 20 is connected to the second connecting rod 21 through the energy dissipation and vibration reduction component 3. The second connecting rod 21 is connected to the central column 15.

[0028] Preferably, the outer column 16 is connected to a converging member 22, and the stabilizing rod 17, the first diagonal rod 18, the second diagonal rod 19 and the first connecting rod 20 are all connected to the converging member 22.

[0029] Preferably, all the peripheral columns 16 are arranged around the central column 15.

[0030] Preferably, both the upper connecting plate 4 and the lower connecting plate 5 are cylindrical in shape.

[0031] Preferably, both the upper connecting plate 4 and the lower connecting plate 5 are in the shape of a quadrangular prism.

[0032] Preferably, the upper connecting plate 4 and the lower connecting plate 5 on the central column 15 are cylindrical, and the upper connecting plate 4 and the lower connecting plate 5 on the outer column 16 are both quadrangular prisms.

[0033] Implementation process: The invention is octagonal in shape, forming a complete seismic isolation and vibration damping steel-concrete composite structure. The upper connecting plate 4 and the lower connecting plate 5 are used to connect with the superstructure and the foundation, transferring loads. The rubber isolation core 6 is made of multiple layers of rubber and steel plates stacked alternately. It is the core component for realizing the seismic isolation function, and uses the elastic deformation of rubber to dissipate and isolate seismic energy.

[0034] Spring 2.13 is used to provide vertical support and a certain elastic restoring force, enhance the overall mechanical performance of the support, consume the energy generated by the earthquake, improve the energy dissipation capacity of the support, and further improve the seismic isolation effect.

[0035] The diagonal bar 8, slide block 9, spring 10, and telescopic rod 11 play a role in stabilizing the structure and transmitting horizontal forces, ensuring the structural stability of the support when it deforms in the horizontal direction.

[0036] The seismic isolation bearing 1 can block the upward transmission of seismic energy and significantly reduce the seismic response of the superstructure.

[0037] The upper connecting plate 4 and the lower connecting plate 5 are made of steel, making their connection with other components more robust and stable. On the other hand, steel has high strength, good rigidity and deformation resistance, which can effectively transmit the horizontal and vertical forces generated during structural vibration, smoothly introduce vibration energy into each energy dissipation element, and ensure that the energy dissipation process is efficient and orderly. At the same time, steel has strong durability and can resist the effects of environmental factors (such as humidity, slight corrosion, etc.) during the long-term use of the building, maintain the structural integrity and mechanical properties of the lower connecting plate 5, and extend the overall service life of the energy dissipation and vibration reduction device.

[0038] The eight outermost columns 16 employ a more complex connection. Firstly, diagonal brace 18 and diagonal brace 2 19 use an X-shaped connection. The core advantages of this connection in terms of seismic resistance and durability are as follows: With its superior seismic performance, bidirectional energy dissipation, and adaptability to earthquakes in multiple directions, the X-shaped connection can simultaneously cope with horizontal bidirectional seismic forces (such as lateral and longitudinal forces). It dissipates seismic energy in different directions through the shear / bending deformation of the steel pipe, avoiding the risk of damper failure in a single direction.

[0039] Damage is concentrated, protecting the main structure. During an earthquake, the middle thick tube section of diagonal rod 18 and diagonal rod 2 19 (i.e., energy dissipation and damping component 3) will deform first, concentrating and dissipating the seismic energy in the energy dissipation and damping component 3 itself, reducing the stress and damage to the main structure (such as beams, columns, and walls), forming a "multi-layered earthquake defense line".

[0040] Displacement amplification improves energy dissipation efficiency. Some X-shaped connection designs (such as lever principle) can amplify the relative displacement of components, allowing components to dissipate energy even under small deformations. This is especially suitable for structures with high stiffness (such as oblique grid structures), solving the problem of "dampers being difficult to activate under small earthquakes".

[0041] It can be quickly repaired after an earthquake. The X-shaped connection usually uses bolts / detachable connection. After an earthquake, only the damaged round pipe section needs to be replaced. There is no need to damage the main structure, which greatly reduces the repair cost and time and improves the structure's "earthquake toughness".

[0042] Durability advantages, uniform stress distribution, reduced local fatigue, and the X-shaped symmetrical layout of the connection make the stress distribution of the steel pipe more uniform, avoid local stress concentration, reduce the risk of fatigue damage under long-term wind load / minor earthquake, and extend the service life of the component.

[0043] With strong protective properties and adaptability to complex environments, the core energy-consuming materials (such as mild steel and viscoelastic materials) of steel pipe dampers are wrapped inside the steel pipe, which can reduce the impact of environmental corrosion (such as humidity and salt), making them especially suitable for buildings in coastal and high-humidity areas.

[0044] With its compact structure and high stability, the X-shaped connection does not change the original shape of the node and has good coordination with the main structure in terms of stress. It avoids sudden changes in structural stiffness caused by the arrangement of dampers and is not prone to problems such as loose connection or uncontrolled deformation during long-term use.

[0045] The central column 15 and outer columns 16 of this seismic isolation and seismic isolation combined steel-concrete composite structure are steel-concrete composite columns. The steel pipes can serve as concrete formwork, eliminating the need for formwork erection and dismantling. Simultaneously, pumped concrete can be used for rapid pouring, simplifying the construction process and shortening the construction period. The steel pipes can be prefabricated in the factory; on-site installation and concrete pouring are all that is required, facilitating industrialized construction and ensuring consistent component quality. This greatly facilitates construction in marine environments.

[0046] The converging component 22 adopts a "rice-shaped" spatial node. This node is the core component of the converging of multiple components. It can efficiently transfer multi-directional loads, evenly distribute horizontal and vertical forces, and avoid local stress concentration. Secondly, the node itself has good ductility and can dissipate energy through plastic deformation, thereby enhancing the structural toughness. It can also integrate dispersed components, improve the overall spatial integrity and anti-instability ability of the structure, adapt to complex layouts, facilitate standardized prefabrication and on-site installation, and improve construction efficiency.

[0047] The beneficial effects of the technical solution of the present invention are as follows: Regarding the advantages of "the structural system's seismic design method being singular, mainly relying on traditional passive reinforcement, and having weak adjustment capabilities when facing complex load conditions": Octagonal structure with 15 central columns: Advantages of overall layout: The octagonal structure has good spatial symmetry. Compared with the conventional rectangular layout, it can more evenly transfer and disperse horizontal and vertical loads. Under complex load conditions such as earthquakes and wind, the stress is more reasonable and the adjustment and adaptability are stronger. It can effectively avoid local stress concentration and help maintain the overall integrity of the structure. Active seismic isolation function of seismic isolation bearing 1: The seismic isolation bearing 1 at the bottom is an active seismic isolation device, which can significantly reduce the transmission of seismic energy to the upper structure by extending the natural vibration period of the structure. This allows the structure to adapt to different seismic intensities through the deformation of the seismic isolation layer, significantly improving its adjustment capability and breaking through the limitations of traditional passive reinforcement. Damage isolation function of seismic isolation bearing 1: The seismic isolation bearing 1 at the bottom concentrates the relative motion between the superstructure and the lower foundation under seismic action in the seismic isolation layer, which greatly reduces the seismic response of the superstructure, thereby reducing the damage to the superstructure. Especially under extreme coupling conditions, it can effectively isolate the transmission of damage to the upper platform structure. The advantages of this approach include "limited means of ensuring load-bearing capacity, mainly relying on the strength reserves of structural materials and the improvement of cross-sectional stiffness, without addressing other key disaster resistance dimensions such as toughness optimization and energy dissipation"; The X-shaped connection between diagonal brace 18 and diagonal brace 2, 19, optimizes energy dissipation and stiffness: the energy dissipation and damping component 3 is connected to diagonal brace 18 and diagonal brace 2, 19, forming an X-shape, similar to a cross brace. This not only enhances the horizontal stiffness of the structure, but also efficiently transfers and dissipates energy through the coordinated work of the brace and the damper. While ensuring the load-bearing capacity, it optimizes the structural toughness and achieves multi-dimensional load-bearing guarantee of "stiffness-energy dissipation-toughness". Damage control function of energy dissipation and vibration damping component 3 and cross support: The connection between energy dissipation and vibration damping component 3 and X-shaped structure serves as a pre-designed energy dissipation structure. Under extreme working conditions, it preferentially undergoes elastoplastic deformation to dissipate energy, guiding damage to concentrate on these replaceable energy dissipation components, avoiding damage accumulation in the main structure of the platform, and ensuring the overall structural integrity. Both the outer column 16 and the central column 15 are steel-concrete composite columns, which have the following mechanical performance advantages: the steel tube in the steel-concrete composite column restrains the concrete, putting the concrete in a triaxial compression state, which greatly improves the compressive strength and ductility; at the same time, the concrete enhances the stability of the steel tube. The two work together to improve the load-bearing capacity while optimizing the structural toughness through the plastic deformation of the components. The cross-shaped spatial nodes on the converging component 22 have advantages in force transmission and ductility: the cross-shaped spatial nodes can achieve efficient transmission of forces in multiple directions, and the nodes themselves have good ductility. Under load, they can dissipate energy through plastic deformation of the nodes, avoiding brittle failure of the nodes. This optimizes the structural toughness at the node level and enriches the dimensions of load-bearing capacity assurance. It addresses the shortcomings of "insufficient damage resistance under extreme coupling conditions, easy accumulation of local damage in the platform structure, inability to effectively maintain structural integrity, and potential impact on overall safety"; Damage resistance of central column 15, outer column 16 and star-shaped joint: The ductility of the steel-concrete composite column and the plastic deformation capacity of the star-shaped joint enable the structure to absorb energy through the deformation of components and joints under extreme coupled conditions, reduce brittle failure, effectively control the development of local damage, and maintain the overall safety of the structure.

[0048] The components, modules, mechanisms, and devices in this invention that are not described in detail are all general standard parts or components known to those skilled in the art. Their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A seismic isolation and vibration damping steel-concrete composite structure for offshore platforms, characterized in that, It includes a seismic isolation bearing (1) and a combined column mechanism (2). There are multiple seismic isolation bearings (1), and all seismic isolation bearings (1) are connected to the combined column mechanism (2). Energy dissipation and damping components (3) are connected to the combined column mechanism (2).

2. The seismic isolation and vibration damping combined steel-concrete composite structure for offshore platforms according to claim 1, characterized in that, The seismic isolation bearing (1) includes an upper connecting plate (4), a lower connecting plate (5), a rubber seismic isolation core (6), a vertical support mechanism, and an inclined support component; The vertical support mechanism includes spring 2 (13) and telescopic rod 2 (14). The rubber isolation core (6) is connected to the upper connecting plate (4) by two or more vertical support mechanisms. Spring 2 (13) is connected between the upper connecting plate (4) and the rubber isolation core (6). Telescopic rod 2 (14) is connected between the upper connecting plate (4) and the rubber isolation core (6). The rubber isolation core (6) is connected to the lower connecting plate (5) by two or more vertical support mechanisms. Spring 2 (13) is connected between the lower connecting plate (5) and the rubber isolation core (6). Telescopic rod 2 (14) is connected between the lower connecting plate (5) and the rubber isolation core (6). The inclined support component includes a ring body (7) and two or more inclined buffer mechanisms. The ring body (7) is slidably connected to the rubber vibration isolation core (6). The inclined buffer mechanism includes an inclined bar (8), a slide (9), a spring (10), a telescopic rod (11), and a connecting seat (12). The inclined bar (8) is rotatably connected to the ring body (7). The inclined bar (8) and the slide (9) are rotatably connected. The slide (9) is connected to the connecting seat (12) through the telescopic rod (11). The slide (9) is connected to the connecting seat (12) through the spring (10). Two diagonal support members are provided; In the upper inclined support member, the slide (9) is slidably connected to the upper connecting plate (4), and the connecting seat (12) is fixedly connected to the upper connecting plate (4); In the lower inclined support component, the slide (9) is slidably connected to the lower connecting plate (5), and the connecting seat (12) is fixedly connected to the lower connecting plate (5).

3. The seismic isolation and vibration damping combined steel-concrete composite structure for offshore platforms according to claim 2, characterized in that, The combined column mechanism (2) includes a central column (15) and two or more peripheral columns (16). The central column (15) is connected to all peripheral columns (16), and each peripheral column (16) is connected to a seismic isolation bearing (1) at its lower end. The central column (15) is connected to a seismic isolation bearing (1) at its lower end.

4. The seismic isolation and vibration damping combined steel-concrete composite structure for offshore platforms according to claim 3, characterized in that, The adjacent outer columns (16) are connected by a stabilizing rod (17), a first diagonal rod (18) and a second diagonal rod (19). Both the first diagonal rod (18) and the second diagonal rod (19) are equipped with energy dissipation and vibration reduction components (3).

5. A seismic isolation and vibration damping steel-concrete composite structure for offshore platforms according to claim 4, characterized in that, The first diagonal bar (18) and the second diagonal bar (19) are arranged in an X-shape.

6. A seismic isolation and vibration damping steel-concrete composite structure for offshore platforms according to claim 5, characterized in that, The outer column (16) and the central column (15) are connected by a vibration damping mechanism. The vibration damping mechanism includes a first connecting rod (20), a second connecting rod (21) and the energy dissipation and vibration reduction component (3). The first connecting rod (20) is connected to the outer column (16). The first connecting rod (20) is connected to the second connecting rod (21) through the energy dissipation and vibration reduction component (3). The second connecting rod (21) is connected to the central column (15).

7. A seismic isolation and vibration damping steel-concrete composite structure for offshore platforms according to claim 6, characterized in that, The outer column (16) is connected to a converging member (22), and the stabilizing rod (17), the first diagonal rod (18), the second diagonal rod (19) and the first connecting rod (20) are all connected to the converging member (22).

8. A seismic isolation and vibration damping steel-concrete composite structure for offshore platforms according to claim 7, characterized in that, All of the outer columns (16) are arranged around the central column (15).

9. A seismic isolation and vibration damping steel-concrete composite structure for offshore platforms according to any one of claims 1-8, characterized in that, Both the upper connecting plate (4) and the lower connecting plate (5) are cylindrical in shape.

10. A seismic isolation and vibration damping steel-concrete composite structure for offshore platforms according to any one of claims 1-8, characterized in that, Both the upper connecting plate (4) and the lower connecting plate (5) are in the shape of a quadrangular prism.

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