A seismic isolation system combining foundation and interlayer

Abstract

The present invention discloses a seismic isolation system combining foundation and interlayer. The seismic isolation system provided by the present invention includes a foundation seismic isolation layer and an interlayer seismic isolation layer, wherein the foundation seismic isolation layer is arranged on the foundation bottom plate of the building, and the interlayer seismic isolation layer is arranged on the top of the floor at the same elevation as the foundation seismic isolation layer. The foundation seismic isolation bearing and the interlayer seismic isolation bearing are at the same elevation, which ensures the coordination and synchronization of the bearing deformation, is suitable for buildings with partial basements and buildings with different numbers of basement floors, and can achieve good seismic isolation effect.

Description

Technical Field

[0001] The invention relates to the technical field of earthquake isolation of building engineering, and in particular to an earthquake isolation system combining a foundation and an interlayer. Background Art

[0002] The seismic isolation technology is used to extend the natural vibration period of the structure to achieve the purpose of shock absorption. After adopting the seismic isolation technology, the seismic performance of the building is significantly improved. It is suitable for various types of buildings such as disaster prevention and relief buildings, school buildings, important infrastructure buildings, residential buildings, offices, etc. in high-intensity earthquake areas. The seismic isolation layer can be set on the foundation slab, basement top slab, large chassis skirt roof, etc. Figure 1 , Figure 2 It is a commonly used isolation layer location.

[0003] The seismic isolation structure in which the seismic isolation layer is set on the foundation slab is called basic seismic isolation (such as Figure 1 ), the advantage of base isolation is that the main floors of the building are above the isolation layer, and the seismic performance of the building above the isolation layer is improved. At the same time, vertical traffic and equipment pipelines do not need to pass through the isolation layer, avoiding the need to set up soft connections. For structures with basements, base isolation requires the setting of isolation trenches, and retaining walls outside the trenches.

[0004] Base isolation is mainly suitable for buildings with relatively regular vertical structures. For buildings with irregular vertical structures (such as large chassis, large platform multi-tower structures, complex high-rise buildings with structural transfer layers, etc.), buildings with special geographical locations (such as buildings built on hillsides, etc.), and old structures with added floors that need to maintain the original appearance of the buildings, it is suitable to use inter-story isolation, that is, to set the isolation layer between floors (such as between the basement top plate and the first floor bottom plate, between the large chassis top plate and the tower bottom plate, etc.) (such as Figure 2 ).

[0005] In actual projects, in order to meet functional requirements, there are local basements or buildings with different numbers of basements. In this case, cross-layer seismic isolation is often used, that is, the seismic isolation layer in the local basement area is also arranged at the foundation bottom slab position (such as Figure 3 ), forming a lower isolation layer, so that the upper and lower isolation layers have different elevations, forming cross-layer isolation. For cross-layer isolation, due to the insufficient stiffness and bearing capacity of the local basement, the deformation of the upper and lower isolation layer supports is not synchronized, and the vibration characteristics are complicated; and the isolation layer of the local basement is set on the foundation slab. Due to the existence of isolation joints, the outer retaining wall of the local basement is separated from the basement structure, and the retaining wall cannot work together with the vertical components of the local basement to resist the soil pressure, resulting in large reinforcement of the retaining wall and poor economy.

[0006] Therefore, for buildings with local basements or basements with different numbers of floors, when the local basements or areas with different numbers of basements, their lateral stiffness and bearing capacity are not enough to ensure that the deformation of the upper and lower isolation layer supports is not synchronized, and it is difficult to strengthen them (such as the local basement area is a frame structure, the cross-section of the frame beams and columns is limited, and shear walls and other lateral anti-seismic components cannot be set up), the base isolation, inter-layer isolation or cross-layer isolation described above cannot meet the isolation requirements of such buildings. Summary of the invention

[0007] In view of this, the main purpose of the present invention is to provide a seismic isolation system combining foundation and interlayer, which is helpful to solve the problem of arranging seismic isolation layers of buildings with local basements or different numbers of basements.

[0008] To achieve the above objective, according to one aspect of the present invention, a foundation-interlayer combined seismic isolation system is provided.

[0009] The seismic isolation system provided by the present invention comprises a base seismic isolation layer and an interlayer seismic isolation layer, wherein:

[0010] The base isolation layer is located on the foundation slab of the building;

[0011] The inter-storey seismic isolation layer is arranged at the top of the floor at the same elevation as the base seismic isolation layer.

[0012] The base isolation layer includes a base isolation bearing, the inter-storey isolation layer includes an inter-storey isolation bearing, and the base isolation bearing and the inter-storey isolation bearing are located at the same elevation.

[0013] For a building with a partial basement, the foundation isolation layer is arranged in the area without a basement, and the inter-storey isolation layer is arranged on the top of the basement.

[0014] The foundation isolation bearing is arranged on the foundation bottom plate in the area without basement; the inter-storey isolation bearing is arranged on the top of the column or the top plate of the shear wall of the local basement; the foundation isolation bearing and the inter-storey isolation bearing are located at the same elevation.

[0015] For a building that has a basement throughout the building but has different numbers of basement floors in different areas, the foundation isolation layer is arranged in the area with fewer basement floors; and the inter-storey isolation layer is arranged in the area with more basement floors.

[0016] The base isolation bearing is arranged on the foundation bottom plate in the area with fewer basement floors; the inter-story isolation layer bearing is arranged on the top of the basement floor at the same elevation as the base isolation bearing.

[0017] The top of the basement floor is a column top or a shear wall top or a top plate with the same elevation as the foundation isolation support.

[0018] The base and interlayer combined seismic isolation system provided by the present invention has the following beneficial effects:

[0019] The isolation system combining foundation and interlayer can solve the problem of arranging isolation layers in buildings with local basements or different numbers of basements in different areas (basement foundation slabs are not at the same elevation). The interlayer isolation layer is arranged at the top of the floor at the same elevation as the foundation isolation layer to avoid the unfavorable situation of asynchronous bearing deformation and complicated vibration characteristics due to insufficient stiffness and bearing capacity of the local basement.

[0020] The foundation isolation bearings and inter-story isolation bearings are at the same elevation, which ensures the coordination and synchronization of the bearing deformation and achieves a good isolation effect.

[0021] For buildings with partial basements, the present invention can reduce the requirements for the rigidity and bearing capacity of the partial basements. For example:

[0022] 1) For cross-story seismic isolation, the bearing capacity of the vertical components of the local basement must meet the elastic requirements of a major earthquake, and the lateral displacement stiffness must meet the requirement of no more than 1 / 1500 under a major earthquake;

[0023] 2) For the seismic isolation method of the present invention, the vertical components of the local basement only need to meet the requirements of shear elasticity and bending non-yielding under a large earthquake, and the lateral stiffness only needs to meet the requirement of no more than 1 / 700 under the design earthquake (1 / 700 means that the local basement is a reinforced concrete seismic wall or a slab-column-seismic wall structure, and the lateral stiffness requirements for other structural types are even lower, as shown in Table 1), which greatly reduces the structural cost.

[0024] Table 1 Limit values ​​of elastic interlayer displacement angles under earthquake protection of substructure

[0025]

[0026] For buildings with partial basements, if the seismic isolation layer of the partial basement is set on the foundation slab, it will result in the setting of seismic isolation trenches and reserved seismic isolation joints at multiple elevations. However, the present invention only requires the setting of seismic isolation trenches and reserved seismic isolation joints at the same elevation, greatly reducing the construction difficulty.

[0027] For buildings with partial basements, if the seismic isolation layer of the partial basement is set on the foundation slab, due to the existence of the seismic isolation joint, the retaining wall outside the partial basement is separated from the basement structure, and the retaining wall cannot work together with the vertical components of the partial basement to resist the soil pressure. Since the location of the seismic isolation trench of the present invention is not at the location of the partial basement, the structure of the partial basement can form an integral resistance to soil pressure with the retaining wall, reducing the thickness and reinforcement of the retaining wall of the partial basement and reducing the construction cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] For purposes of illustration and not limitation, the present invention will now be described in terms of preferred embodiments thereof, with particular reference to the accompanying drawings, in which:

[0029] Figure 1 This is a schematic diagram of base isolation.

[0030] Figure 2 Schematic diagram of inter-layer seismic isolation.

[0031] Figure 3 Schematic diagram of cross-story seismic isolation.

[0032] Figure 4 It is a schematic diagram of the foundation and inter-layer seismic isolation system of the present invention in a partial basement building.

[0033] Figure 5 It is a schematic diagram of the seismic isolation system combining foundation and inter-story of the present invention in a building with different numbers of basement floors.

[0034] Among them, 1 - foundation isolation layer, 2 - inter-floor isolation layer, 3 - foundation isolation bearing, 4 - isolation trench, 5 - foundation slab of area without basement, 6 - foundation slab of partial basement area, 7 - isolation layer beam, 8 - structural column or shear wall of partial basement (or basement top slab), 9 - retaining wall, 10 - inter-floor isolation bearing. DETAILED DESCRIPTION

[0035] Example 1: Seismic isolation system combining foundation and inter-layer in partial basement building

[0036] refer to Figure 4 , showing a seismic isolation system combining foundation and interlayer in a partial basement building. Among them, the foundation isolation layer 1 is arranged in the area without basement, and the foundation isolation bearing 3 is arranged on the foundation slab 5 in the area without basement. The interlayer isolation layer 2 is arranged in the area of ​​the partial basement, and the interlayer isolation bearing 10 is arranged on the top of the column or the top of the shear wall or the top plate 8 in the partial basement area; the foundation isolation bearing 3 and the interlayer isolation bearing 10 are at the same elevation. The foundation isolation bearing and the interlayer isolation bearing are at the same elevation, which ensures the coordination and synchronization of the bearing deformation, is suitable for the construction of partial basements, and can achieve good seismic isolation effect. The seismic isolation trench 4 is located between the foundation seismic isolation layer 1 or the inter-layer seismic isolation layer 2 and the retaining wall 9, between the seismic isolation layer beam 7 and the retaining wall 9, and between the foundation seismic isolation bearing 3 and the retaining wall 9. The seismic isolation trench 4 is separated from the foundation seismic isolation layer 1 or the inter-layer seismic isolation layer 2, the seismic isolation trench 4 is separated from the foundation seismic isolation bearing 3, and the seismic isolation trench 4 is separated from the seismic isolation layer beam 7. The width of the seismic isolation trench is determined by the maximum horizontal displacement of the seismic isolation bearing under an earthquake.

[0037] Example 2: Seismic isolation system combining foundation and inter-story in buildings with different numbers of basement floors in different areas

[0038] refer to Figure 5 , showing a seismic isolation system combining foundation and interlayer in buildings with different numbers of basement floors in different areas. Among them, the foundation isolation layer 1 is arranged in the area with fewer basement floors, and the foundation isolation bearing 3 is arranged on the foundation slab 5 in the area with fewer basement floors. The interlayer seismic isolation layer 2 is arranged in the area with more basement floors, and the interlayer seismic isolation bearing 10 is arranged at the top of the basement floor at the same elevation as the foundation isolation bearing 3, which can be the top of the column or the top of the shear wall or the top plate at the same elevation as the foundation isolation bearing; the foundation isolation bearing 3 and the interlayer seismic isolation bearing 10 are at the same elevation. The foundation isolation bearing and the interlayer seismic isolation bearing are at the same elevation, which ensures the coordination and synchronization of the bearing deformation, is suitable for buildings with partial basements, and can achieve good seismic isolation effects.

[0039] The seismic isolation trench 4 is located between the foundation seismic isolation layer 1 or the inter-layer seismic isolation layer 2 and the retaining wall 9, between the seismic isolation layer beam 7 and the retaining wall 9, and between the foundation seismic isolation bearing 3 and the retaining wall 9. The seismic isolation trench 4 is separated from the foundation seismic isolation layer 1 or the inter-layer seismic isolation layer 2, the seismic isolation trench 4 is separated from the foundation seismic isolation bearing 3, the seismic isolation trench 4 is separated from the seismic isolation layer beam 7, and the width of the seismic isolation trench is determined by the maximum horizontal displacement of the seismic isolation bearing under an earthquake.

[0040] The seismic isolation structure design of the present invention requires verification of the seismic isolation layer, including: long-term surface pressure control of the seismic isolation bearing, eccentricity control of the seismic isolation layer, restoring force verification, deformation difference between seismic isolation bearings; calculation of horizontal damping coefficient under moderate earthquakes; horizontal displacement control of seismic isolation bearings under rare earthquakes, verification of short-term minimum and maximum surface pressures, horizontal shear force verification, etc.; for seismic isolation structures with dampers, it is necessary to verify the damper stroke and maximum output force; for structures with anti-tension devices, it is necessary to verify the bearing capacity of the anti-tension device; wind load verification of the seismic isolation layer; deformation verification of the seismic isolation layer under temperature; bearing capacity verification of transfer beams, seismic isolation bearing piers, pillars and connected components. In addition to the above problems, it is also necessary to verify the bearing capacity and stiffness of the relevant components that directly support the seismic isolation bearings in the structure below the seismic isolation layer (such as the basement) to meet the bearing capacity and deformation requirements under a large earthquake.

[0041] The base-interlayer combined seismic isolation system provided by the present invention has the following characteristics and beneficial effects:

[0042] (1) In areas without basements, the foundation isolation bearings are located on the foundation slab;

[0043] (2) In the local basement area, the inter-story seismic bearing is located at the top of the basement and can be supported on the top of the column or the top of the shear wall or the local basement roof;

[0044] (3) The foundation isolation bearings installed on the foundation slab and the inter-story isolation bearings installed on the top of the local basement are located at the same elevation;

[0045] (4) The base isolation bearing and the inter-story isolation bearing are at the same elevation, which ensures the coordination and synchronization of bearing deformation. It is suitable for buildings with partial basements and can achieve good isolation effects.

[0046] (5) In addition to being suitable for seismic isolation buildings with partial basements, the present invention is also suitable for seismic isolation forms of buildings with different numbers of basement floors (different basement foundation slab elevations) in different regions (such as Figure 5 In areas where the basement is shallow (with a small number of basement floors), base isolation is used, and the base isolation bearing is located on the foundation bottom plate; in areas where the basement is deep (with a large number of basement floors), inter-story isolation is used, and the inter-story isolation bearing is located on the top of the basement floor at the same elevation as the basement isolation.

[0047] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may occur depending on design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A seismic isolation system, It is characterized in that It includes base isolation layer and interlayer isolation layer, among which: The base isolation layer is located on the foundation slab of the building; The inter-storey seismic isolation layer is arranged at the top of the floor at the same elevation as the base seismic isolation layer; The base isolation layer includes a base isolation bearing, the inter-layer isolation layer includes an inter-layer isolation bearing, and the base isolation bearing and the inter-layer isolation bearing are located at the same elevation; The seismic isolation system is a seismic isolation system combining foundation and interlayer in a local basement building or a seismic isolation system combining foundation and interlayer in a building with different numbers of basement floors in different areas. For buildings with partial basements, the base isolation layer is set in the area without basements, and the inter-storey isolation layer is set on the top of the basements; For a building with a basement throughout the building but with different numbers of basement floors in different areas, the basement isolation layer is set in the area with fewer basement floors; the inter-storey isolation layer is set in the area with more basement floors; The seismic isolation system is also provided with a seismic isolation trench, the width of which is determined by the maximum horizontal displacement of the seismic isolation bearing under an earthquake.

2. The seismic isolation system according to claim 1, Features: The foundation isolation bearing is arranged on the foundation bottom plate in the area without basement; the inter-storey isolation bearing is arranged on the top of the column or the top plate of the shear wall of the local basement; the foundation isolation bearing and the inter-storey isolation bearing are located at the same elevation.

3. The seismic isolation system according to claim 1, Features: The base isolation bearing is arranged on the foundation bottom plate in the area with fewer basement floors; and the inter-storey isolation bearing is arranged on the top of the basement floor at the same elevation as the base isolation bearing.

4. The seismic isolation system according to claim 3, Features: The top of the basement floor is a column top or a shear wall top or a top plate with the same elevation as the foundation isolation support.

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