Supporting type swing shock isolation device based on double-spherical-surface support

Abstract

The utility model discloses a supporting type swing shock isolation device based on a double-spherical-surface support. The supporting type swing shock isolation device comprises a shock absorption body, the supporting main body is used for supporting the damping main body placed on the supporting main body; the double-spherical-surface support is located between the damping main body and the supporting main body; the bottom surface of the double-spherical-surface support is provided with a first curved surface which is convex downwards, correspondingly, the top surface of the supporting main body is provided with an upper connecting concave curved surface which is concave downwards, and the first curved surface abuts against the upper connecting concave curved surface and can slide along the upper connecting concave curved surface; the top surface of the double-spherical-surface support is provided with a second curved surface protruding upwards, correspondingly, the bottom surface of the damping body is provided with a lower connecting concave curved surface recessed upwards, the second curved surface abuts against the lower connecting concave curved surface, and the second curved surface and the upper connecting concave curved surface can slide. According to the shock isolation device, the earthquake acting force of the shock isolation device can be reduced, the dynamic response of a main structure under the earthquake action is reduced, the safety of the shock isolation device is guaranteed, and the manufacturing cost is reduced by adopting a supporting type swing shock isolation method.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of shock absorption, more particularly to a support type swing seismic isolation device based on double spherical support. BACKGROUND

[0002] The existing power plant devices generally do not use seismic isolation connection, that is, the entire mass of the device participates in the seismic working condition. Due to the huge mass of some heavy equipment (such as power plant devices, deaerators, various heaters, etc.), for example, a 600 MW power plant, the single device full coal mass exceeds 1000 t, the device number is 12-14, and the total mass exceeds 10000 t; the single deaerator full water mass exceeds 800 t, and the mass of various high and low heaters exceeds 150 t, the number is 5-8, and the total mass exceeds 1500 t; these equipment will generate huge seismic inertia force, which will generate huge horizontal seismic force on the main structure. In addition, the uneven mass distribution of the main structure will produce irregularity, which will bring greater seismic risk and higher cost. At the same time, the equipment itself is also easy to be damaged by earthquake.

[0003] The existing technology has explored the device seismic isolation scheme, such as using rubber seismic isolation device, suspension swing device, rubber and damper composite shock absorption device, etc. for shock absorption. The invention name is "device supporting device", and the invention patent with the authorization announcement number CN102381524B discloses a technical scheme of using rubber or spring seismic isolation support for device seismic isolation. The invention name is "suspension type device shock absorption structure for improving the seismic performance of the main plant house of the thermal power plant", and the invention patent with the authorization announcement number CN105544760B discloses a way of hanging the device on the upper frame beam to achieve the effect of swing seismic isolation. The invention name is "support type device shock absorption structure for improving the seismic performance of the main plant house of the thermal power plant", and the invention patent with the authorization announcement number CN103088906B discloses a composite scheme of rubber seismic isolation support and damper, which is to increase the damper on the basis of the rubber seismic isolation device, adjust the vibration period of the device to be close to the period of the support main body, and enhance the energy dissipation effect through the damper, so as to further reduce the influence of the seismic response of the device on the main structure and improve the composite shock absorption effect.

[0004] However, the above technical schemes still have various problems and cannot be put into actual engineering use:

[0005] 1. If rubber isolation device is used, because its stiffness is controlled by the coal capacity in the device, the change of coal capacity will significantly change the isolation period, so its isolation effect is very unstable. The period of the structure is very different when the device is full of coal and empty of coal, and the designed isolation effect cannot be achieved. Moreover, the rubber isolation bearing does not have self-resetting capability and will be damaged after a major earthquake, and needs to be replaced. In addition, the durability of rubber products is poor, and the performance stability for long-term use cannot be guaranteed.

[0006] 2. The suspension device is less safe than the support device, and the suspension member itself will provide certain damping and stiffness, which will deviate from the isolation design and reduce the isolation effect. At the same time, it will be damaged after an earthquake, and the left and right swings of the epicenter will cause fatigue problems of the member, which actually reduces the safety redundancy of the entire system. And the suspension device also needs to add additional dampers to limit the swing of the device, and it is not easy to replace after damage. The installation of the suspension device is more difficult, and needs to be temporarily fixed in the air, which increases the construction cost.

[0007] 3. If a composite seismic mitigation and isolation device of rubber and damper is used, firstly it still has the above problems of rubber isolation device. Because its isolation bearing is controlled by the coal capacity in the device, the change of coal capacity will significantly affect its isolation period and isolation effect, and the stiffness is unstable. The added dampers need to be adjusted in stiffness through certain optimization design algorithm, which leads to the increase of complexity of the entire system, the decrease of practicability, and the actual unsatisfactory seismic mitigation effect.

[0008] Therefore, there is still a lack of a device that can effectively overcome the above problems, so that the seismic mitigation can be more economical, convenient, durable, efficient and precise. Content of the utility model

[0009] The utility model discloses a support type swing isolation device based on double spherical bearing, which can reduce the seismic force and the dynamic response of the main structure under the action of earthquake by the support type swing isolation method, ensure the safety, and reduce the cost.

[0010] The utility model provides a support type swing isolation device based on double spherical bearing, and the isolation device comprises:

[0011] A damping main body;

[0012] A support main body for supporting the damping main body placed thereon; and

[0013] At least one double spherical bearing between the damping main body and the support main body.

[0014] wherein a bottom surface of the double spherical support has a first curved surface that is convex downward, and a top surface of the support body has a upper connecting concave curved surface that is concave downward, the first curved surface abuts against the upper connecting concave curved surface and is slidable along the upper connecting concave curved surface; a top surface of the double spherical support has a second curved surface that is convex upward, and a bottom surface of the shock absorption body has a lower connecting concave curved surface that is concave upward, the second curved surface abuts against the lower connecting concave curved surface, and the second curved surface and the upper connecting concave curved surface are slidable;

[0015] The shock absorption body is swingable relative to the support body via the at least one double spherical support to isolate shock.

[0016] In another preferred embodiment, the double spherical support is a pie-shaped structure with a thick middle and thin edges.

[0017] In another preferred embodiment, the first curved surface and the second curved surface of the double spherical support, the lower connecting concave curved surface of the shock absorption body, and the upper connecting concave curved surface of the support body are all friction surfaces.

[0018] In another preferred embodiment, the centers of the circles on which the second curved surface, the first curved surface, the lower connecting concave curved surface of the shock absorption body, and the upper connecting concave curved surface of the support body are all on a straight line.

[0019] In another preferred embodiment, the lower connecting concave curved surface of the shock absorption body is provided with an extension part extending downward from an outer edge of the lower connecting concave curved surface of the shock absorption body toward the support body, the extension part being used to define a movement range of the double spherical support relative to the shock absorption body.

[0020] In another preferred embodiment, the shock isolation device has an equivalent radius of curvature R, which is the sum of a radius R1 of the first curved surface and a radius R2 of the second curved surface minus a thickness d of the double spherical support, and the range of R is 1-3 meters.

[0021] The utility model provides a kind of support type swing shock isolation device, and the shock isolation device comprises:

[0022] Shock absorption body;

[0023] Support body, the support body is used to support the shock absorption body placed on it;And

[0024] At least one spherical support, the spherical support is located between the shock absorption body and the support body;

[0025] The bottom surface of the spherical support has a first curved surface which is convex downward, and the top surface of the supporting body has a upper connecting concave curved surface which is concave downward, the first curved surface abuts against and is slidable along the upper connecting concave curved surface, and the shock-absorbing body is swingable relative to the supporting body via at least one of the spherical supports to isolate the shock.

[0026] In another preferred embodiment, the shock-absorbing body is a non-powered device, such as a coal hopper, deaerator, heat exchanger, etc.

[0027] In another preferred embodiment, the supporting body is a steel structure or a concrete structure.

[0028] In another preferred embodiment, the pipeline connected to the shock-absorbing body is connected by a flexible pipe or the like, and the deformation capacity of the flexible pipe is designed to prevent the pipeline from being damaged by the seismic force of the device under earthquake.

[0029] In another preferred embodiment, the spherical support is fixed to the shock-absorbing body.

[0030] In another preferred embodiment, the spherical support is integrally formed with the shock-absorbing body.

[0031] In another preferred embodiment, the spherical support is a separate component from the shock-absorbing body.

[0032] In another preferred embodiment, the spherical support has a pie-shaped structure with a thick middle and thin edges.

[0033] In another preferred embodiment, the spherical supports are uniformly spaced to support the device body.

[0034] In another preferred embodiment, the top surface of the spherical support has a second curved surface which is convex upward, and the bottom surface of the shock-absorbing body has a lower connecting concave curved surface which is concave upward, the second curved surface abuts against the lower connecting concave curved surface, and the second curved surface and the upper connecting concave curved surface are slidable.

[0035] In another preferred embodiment, the first curved surface of each of the spherical supports has the same radius of curvature, and the second curved surface of each of the spherical supports has the same radius of curvature.

[0036] In another preferred embodiment, each of the upper connecting concave curved surfaces of the supporting body has the same radius of curvature.

[0037] In another preferred embodiment, each of the lower connecting concave curved surfaces of the shock-absorbing body has the same radius of curvature.

[0038] In another preferred embodiment, the first curved surface and the second curved surface of the spherical support, the lower connecting concave curved surface of the shock-absorbing body, and the upper connecting concave curved surface of the supporting body are all friction surfaces.

[0039] It should be noted that the friction coefficients of the second curved surface and the first curved surface of the spherical support, the lower connecting concave curved surface of the shock-absorbing body, and the upper connecting concave curved surface of the support body can be designed according to actual needs, which can be the same or different.

[0040] In another preferred embodiment, the friction between the spherical support and the shock-absorbing body is greater than the friction between the face support and the support body.

[0041] In another preferred embodiment, the centers of the circles on which the second curved surface, the first curved surface of the spherical support, the lower connecting concave curved surface of the shock-absorbing body, and the upper connecting concave curved surface of the support body are located are on a straight line.

[0042] In another preferred embodiment, the lower connecting concave curved surface of the shock-absorbing body is provided with an extension, which is a part extending downward from the outer edge of the lower connecting concave curved surface of the shock-absorbing body toward the support body, and is used to define the movement range of the spherical support corresponding to the shock-absorbing body. That is, the swing amplitude of the shock-absorbing body is limited so that the shock-absorbing body will not slip or fall due to excessive swing.

[0043] In another preferred embodiment, the shock isolation device has an equivalent radius of curvature R, which is the sum of the radius R1 of the first curved surface and the radius R2 of the second curved surface minus the thickness d of the spherical support, and R ranges from 1 to 3 meters. Preferably, the ratio of R1 to R2 is 0.8 to 1.2; more preferably, the ratio of R1 to R2 is 1, i.e., R1 = R2.

[0044] In another preferred embodiment, in the case where the spherical support and the shock-absorbing body are fixed integrally or integrally formed, the shock isolation device has an equivalent radius of curvature R, which is the radius R1 of the first curved surface.

[0045] In another preferred embodiment, the equivalent radius of curvature R is obtained by the following formula:

[0046]

[0047] In the formula, T S is the structural period, unit: seconds;

[0048] M is the mass of the support body, unit: kilograms;

[0049] m is the mass of the shock-absorbing body, unit: kilograms;

[0050] μ is the dynamic friction coefficient;

[0051] D is the horizontal displacement of the spherical support, unit: meters;

[0052] g is the acceleration of gravity.

[0053] In another preferred example, the structural period T is obtained by the design parameters and actual conditions S , the mass M of the support body, the mass m of the shock-absorbing body, the dynamic friction coefficient μ and the horizontal displacement D of the spherical support, are substituted into the above formula to obtain the equivalent curvature radius R.

[0054] In another preferred example, the optimal frequency ratio f opt and the optimal damping ratio ξ opt are obtained by the following formula:

[0055]

[0056] In another preferred example, the equivalent curvature radius R is obtained by the following formula:

[0057]

[0058] In the formula, TR is the transmission ratio;

[0059] ω g is the external excitation frequency, unit: hertz;

[0060] μ is the dynamic friction coefficient;

[0061] D is the horizontal displacement of the spherical support, unit: meter;

[0062] g is the acceleration of gravity.

[0063] In another preferred example, the main frequency range ω g of the earthquake is obtained by referring to the Kanai-Tajimi spectrum, the required isolation efficiency TR is determined and the design horizontal displacement D is given, the friction coefficient μ or the equivalent curvature radius R is determined, and the other parameter is calculated, and so on, and after the iterative trial calculation, the optimal parameter combination conforming to the actual conditions is obtained.

[0064] It should be understood that, within the scope of the present application, the above-mentioned technical features of the present application and the technical features specifically described in the following (such as the embodiments) can be combined with each other to form new or preferred technical solutions. Due to the limited space, they will not be listed one by one here. BRIEF DESCRIPTION OF DRAWINGS

[0065] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0066] Figure 1 is a schematic view of a support type swing isolation device based on a double spherical support in an example of the present application;

[0067] Figure 2 shows the equivalent curvature radius R of the isolation device of the double spherical support in an example of the present application;

[0068] Figure 3 is a principle diagram of the isolation device of the double spherical support based on tuned mass damping in an example of the present application;

[0069] Figure 4 is a comparison of the seismic effect of the isolation device of the double spherical support and the non-isolated building in an example of the present application.

[0070] In each drawing, each indication is as follows:

[0071] 1 - damping main body;

[0072] 2 - support main body;

[0073] 3 - spherical support;

[0074] 4 - first curved surface;

[0075] 5 - second curved surface;

[0076] 6 - upper connecting concave curved surface;

[0077] 7 - lower connecting concave curved surface;

[0078] 8 - extension. DETAILED DESCRIPTION

[0079] The inventor has carried out extensive and in-depth research, and through a large number of screening, a support type swing isolation device based on a double spherical support has been developed for the first time. Compared with the prior art, the support type swing isolation device of the present application can reduce the seismic force of the device by using the method of support type swing isolation, reduce the dynamic response of the main structure under the action of the earthquake, ensure the safety, and reduce the cost. On this basis, the present application is completed.

[0080] TERMS

[0081] As used herein, the term "support main body" refers to in a multi-story industrial plant, due to the need of the process, part of the heavy equipment will be placed on the floor, for such equipment, it is necessary to set up a support main body (such as steel support pier, concrete support pier, sliding plate support pier, etc.) on the floor for transmitting the equipment load to the support main body.

[0082] As used herein, the term "coal hopper" also called raw coal bin, is a container for temporarily storing coal before it enters the coal mill in a thermal power plant, supported or suspended in the coal bin room, which can be a steel structure or a concrete structure.

[0083] As used herein, the term "seismic isolation" refers to a measure to reduce and isolate seismic response by lengthening the structure period, making the structure soft.

[0084] As used herein, the term "swing" refers to the ability to sway left and right under the action of horizontal force, but eventually stop vibrating due to damping energy dissipation.

[0085] The utility model provides a kind of support type swing seismic isolation device, it is a support type swing seismic isolation device with specific structure.

[0086] Typically, the support device of the utility model belongs to equipment seismic isolation technology. The damping main body is placed on the support main body, and the support main body is the structure of the coal bin room of the thermal power plant, which can be a frame structure or a concrete structure. The damping main body can be a concrete device or a steel device, and the damping main body is a conventional device. The connection point between the damping main body and the support main body adopts a spherical support (similar to a building friction pendulum seismic isolation support), so that the damping main body can swing relative to the support main body when the support main body swings left and right under the influence of an earthquake, resulting in a smaller inertial force. Multiple spherical supports can be placed around the damping main body. To ensure that the damping main body has only one determined period, the spherical supports of the support device should have the same radius of curvature. The lower support is supported on the spherical surface of the metal support at the connection between the lower support and the support main body, and the spherical surface is provided with friction material. Different surface materials can be filled on the interface of the spherical support to produce different friction forces, which can dissipate energy.

[0087] The support type swing seismic isolation device of the utility model is actually a sliding seismic isolation technology. By separating the support main body or foundation from the protected part, the seismic force transmitted by the foundation to the upper structure is greatly reduced, and the maximum horizontal force transmitted is the maximum friction force, thereby playing a seismic isolation role to protect the support main body.

[0088] According to the relevant content of GB / T 37358-2019 "Building Friction Pendulum Seismic Isolation Support", the swing period T (unit: second) of the friction pendulum seismic isolation support is:

[0089]

[0090] In the formula, R' is the swing radius, unit: meter; g is the acceleration of gravity, usually 9.81 m / s 2 .

[0091] The equivalent stiffness K of the friction pendulum seismic isolation support eff(Unit: N / m) is:

[0092]

[0093] In the formula: R is the equivalent radius of curvature, in meters; μ is the coefficient of dynamic friction; D is the horizontal displacement of the spherical support, in meters; P is the vertical load on the spherical support, in Newtons.

[0094] The equivalent period T of the friction pendulum isolation bearing e (Unit: seconds) is:

[0095]

[0096] The equivalent damping ratio of the friction pendulum seismic isolation bearing is:

[0097]

[0098] It can be seen that the equivalent period T of the friction pendulum isolation bearing e It is independent of the vertical load P, meaning it has the same isolation period under different coal volumes, and can always play a stable isolation role. Furthermore, its friction surface can provide damping under earthquakes of different intensities, producing an energy dissipation effect, eliminating the need for additional dampers, thus simplifying construction and installation and reducing costs.

[0099] Method 1: From the perspective of tuned mass damping, its schematic diagram is as follows. Figure 3 As shown.

[0100] From the perspective of tuned mass damping, the device and related building structure can be simplified into a two-degree-of-freedom mass string model, where the supporting main body and the damping main body are simplified to degrees of freedom M and m, respectively. Under seismic excitation... The dynamic equations are as follows:

[0101]

[0102] In the formula, M is the mass of the supporting main body, in kilograms; m is the mass of the shock-absorbing main body, in kilograms; The acceleration (relative acceleration) supporting the main body, unit: m / s² 2 ; The acceleration (relative acceleration) of the damping element, unit: m / s² 2 C represents the damping of the main support structure, in Ns / m; c represents the damping of the main shock absorber structure, in Ns / m. and For velocity, the unit is m / s; X and x are displacements, the unit is m; K is the stiffness of the supporting structure, the unit is N / m; k is the stiffness of the damping structure, the unit is N / m. The unit for earthquake ground acceleration is m / s².2 .

[0103] At this time, the optimal frequency ratio f opt and the optimal damping ratio ξ opt may be obtained based on the simplex method optimization algorithm based on the mass ratio γ

[0104]

[0105] In combination with the above formula, when the relevant parameters such as the mass ratio and the structure period are given, the parallel equations are brought in:

[0106]

[0107] In the formula, T S is the structure period, and the unit is second.

[0108] The following can be obtained:

[0109]

[0110] Method two: if starting from the isolation theory, for the simple harmonic excitation acting on the single-degree-of-freedom isolation structure, the following derivation about the vibration response is obtained:

[0111]

[0112] In the formula, TR is the transmission ratio, λ is the dynamic amplification coefficient, β is the excitation frequency ratio, ω g is the external excitation frequency, and the unit is hertz.

[0113] After being brought in and simplified, the following can be obtained:

[0114]

[0115] Referring to the Kanai-Tajimi spectrum, the main frequency range ω g of the earthquake can be calculated, so that TR is only related to the friction coefficient μ and the equivalent curvature radius R of the friction pendulum isolation bearing. After determining the required isolation efficiency TR and giving the design horizontal displacement D, the friction coefficient or the equivalent curvature radius can be determined according to the actual situation, and the other parameter is calculated, and after repeated iteration and trial calculation, the optimal parameter combination meeting the actual situation is obtained.

[0116] The main advantages of the utility model include:

[0117] (a) The rigidity of the device and the isolation period of the device itself are little affected by the capacity (such as coal capacity, water capacity, etc.) in the device, and the isolation effect is reliable.

[0118] (b) The device does not need to be additionally provided with a damper, and the construction is simple, the structure is simple, the reliability is high, and the construction cost is reduced.

[0119] (c) The device is not damaged under a large earthquake, and does not need to be replaced after the earthquake. The device can return to the original position under the action of gravity after the earthquake, without adjustment, and has better seismic toughness.

[0120] (d) If repair is needed due to accidental reasons, replacement is also relatively easy, reducing the cost of replacement.

[0121] (e) The supporting body metal structure has good durability.

[0122] The utility model will be further described below in combination with specific embodiments. It should be understood that these embodiments are only used to illustrate the utility model and are not used to limit the scope of the utility model. In addition, the drawings are schematic drawings, so the utility model device and equipment are not limited by the size or proportion of the schematic drawings.

[0123] It should be noted that in the claims and specification of the patent, relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement "including one" does not exclude the presence of other identical elements in the process, method, article or equipment including the element.

[0124] Embodiments

[0125] The support type swing seismic isolation device based on double spherical supports of the embodiment is shown in Figure 1 The seismic isolation device includes a damping body 1 (shown as a coal bucket for containing coal), a supporting body 2 for supporting the damping body 1 placed thereon, and four double spherical supports 3 uniformly arranged between the damping body 1 and the supporting body 2.

[0126] As shown in Figure 2As shown, the double spherical bearing 3 and the damping body 1 are independent components. The double spherical bearing 3 is a pie-shaped structure with a thick middle and thin edges. The bottom surface of the double spherical bearing 3 has a first curved surface 4 that is convex downward, and the top surface of the support body 2 has a upper connecting concave surface 6 that is concave downward, the first curved surface 4 abuts against the upper connecting concave surface 6 and is slidable along the upper connecting concave surface 6; the top surface of the double spherical bearing 3 also has a second curved surface 5 that is convex upward, and the bottom surface of the damping body 1 has a lower connecting concave surface 7 that is concave upward, the second curved surface 5 abuts against the lower connecting concave surface 7, and the second curved surface 5 and the upper connecting concave surface 6 are slidable. The damping body 1 is swingable relative to the support body 2 through the four double spherical bearings 3 to isolate the vibration.

[0127] The first curved surface 4 and the second curved surface 5 of the double spherical bearing 3, the lower connecting concave surface 7 of the damping body 1, and the upper connecting concave surface 6 of the support body 2 are all friction surfaces. In the four double spherical bearings 3, the curvature radius of the first curved surface 4 of each double spherical bearing 3 is the same, and the curvature radius of the second curved surface 5 of each double spherical bearing 3 is the same; correspondingly, the curvature radius of each upper connecting concave surface 6 of the support body 2 is the same, and the curvature radius of each lower connecting concave surface 7 of the damping body 1 is the same. The centers of the circles on which the second curved surface 5, the first curved surface 4 of the double spherical bearing 3, the lower connecting concave surface 7 of the damping body 1, and the upper connecting concave surface 6 of the support body 2 are located are on a straight line.

[0128] It should be noted that the friction coefficients of the second curved surface 5 and the first curved surface 4 of the double spherical bearing 3, the lower connecting concave surface 7 of the damping body 1, and the upper connecting concave surface 6 of the support body 2 can be designed according to actual needs, which can be the same or different. Preferably, the friction between the double spherical bearing 3 and the damping body 1 is greater than the friction between the double spherical bearing and the support body 2.

[0129] The lower connecting concave surface 7 of the damping body 1 is provided with an extension 8, which is a part extending downward from the outer edge of the lower connecting concave surface 7 of the damping body 1 toward the support body 2, and the extension 8 is used to limit the movement range of the double spherical bearing 3 relative to the damping body 1. That is, the swing amplitude of the damping body 1 is limited so that the damping body 1 will not slip or fall due to excessive swing.

[0130] The following describes how to obtain a more optimal equivalent curvature radius R of the double spherical bearing (which is the sum of the radius R1 of the first curved surface 4 and the radius R2 of the second curved surface 5 minus the difference of the thickness d of the double spherical bearing 3).

[0131] According to the relevant content of GB / T 37358-2019 "Building Friction Pendulum Isolation Bearing", the swing period T (unit: second) of the friction pendulum isolation bearing is:

[0132]

[0133] wherein R' is the swing radius, unit: meter; g is the acceleration of gravity, usually 9.81 m / s 2 .

[0134] The equivalent stiffness K of the friction pendulum seismic isolation bearing is: eff (unit: N / m) is:

[0135]

[0136] wherein R is the equivalent curvature radius, unit: meter; μ is the dynamic friction coefficient; D is the horizontal displacement of the double spherical bearing 3, unit: meter; P is the vertical load borne by the double spherical bearing 3, unit: Newton.

[0137] The equivalent period T of the friction pendulum seismic isolation bearing is: e (unit: second) is:

[0138]

[0139] The equivalent damping ratio of the friction pendulum seismic isolation bearing is:

[0140]

[0141] It can be seen that the equivalent period T of the friction pendulum seismic isolation bearing e is independent of the vertical load P, that is, it has the same isolation period under different coal capacities, and can always play a stable isolation role. And its friction surface can provide damping under different intensity earthquakes, produce energy dissipation effect, without the need for additional dampers, making its construction and installation simple and reducing cost.

[0142] Method one: from the perspective of tuned mass damping, the principle diagram is as Figure 3 shown.

[0143] From the perspective of tuned mass damping, the device and the related building structure can be simplified into a double-degree-of-freedom mass string model, wherein the support main body 2 and the damping main body 1 are simplified into the degrees of freedom of M and m respectively, and the dynamics equation under seismic excitation is:

[0144]

[0145] wherein M is the mass of the support main body 2, unit: kilogram; m is the mass of the damping main body 1, unit: kilogram; is the acceleration (relative acceleration) of the support main body 2, unit: m / s 2 ; is the acceleration (relative acceleration) of the damping main body 1, unit: m / s 2 ​; C is the damping of the support body 2, unit: Ns / m; c is the damping of the shock-absorbing body 1, unit: Ns / m; and is the velocity, unit: m / s; X and x are the displacement, unit: m; K is the stiffness of the support body 2, unit: N / m; k is the stiffness of the shock-absorbing body 1, unit: N / m; is the seismic ground acceleration unit: m / s 2 .

[0146] At this time, the optimal frequency ratio f opt and the optimal damping ratio ξ opt based on the mass ratio γ can be obtained according to the simplex method optimization algorithm. The following is an example of a calculation formula:

[0147]

[0148]

[0149] In combination with the above formula, when the relevant parameters such as the mass ratio and the structure period are given, the parallel equations are brought in:

[0150]

[0151] In the formula, T S is the structure period, unit: second.

[0152] It can be obtained:

[0153]

[0154] That is, by obtaining the structure period T S , the mass M of the support body 2, the mass m of the shock-absorbing body 1, the dynamic friction coefficient μ and the horizontal displacement D of the double spherical support 3 through the design parameters and the actual situation, the equivalent curvature radius R can be obtained by substituting the following formula. The optimal frequency ratio f opt and the optimal damping ratio ξ opt can be obtained by substituting the above formula.

[0155]

[0156] In the formula, T S is the structure period, unit: second;

[0157] M is the mass of the support body 2, unit: kilogram;

[0158] m is the mass of the shock-absorbing body 1, unit: kilogram;

[0159] μ is the dynamic friction coefficient;

[0160] D is the horizontal displacement of the double spherical support 3, unit: meter;

[0161] g is the acceleration of gravity.

[0162] R ranges from 1 to 3 meters. Preferably, the ratio of R1 to R2 is 0.8 to 1.2; more preferably, the ratio of R1 to R2 is 1, i.e., R1 = R2.

[0163] An example of the calculation process of the tuned mass damper method is as follows: the period T of the main plant or the side coal bunker structure of a large thermal power plant is generally about 1s to 1.5s. According to the above formula, if the mass ratio γ of the damping main body 1 to the support main body 2 is 0.6, and the structure period T is 1.5s, then the optimal frequency ratio f is 0.625, the equivalent period T of the device is 2.4s. When the horizontal design displacement D is 100mm, the friction coefficient μ of the friction pendulum seismic isolation bearing required is 0.041, and the equivalent curvature radius R is about 3479mm. S opt e

[0164] Method two: if starting from the theory of seismic isolation, for a single-degree-of-freedom seismic isolation structure subjected to simple harmonic excitation, the following derivation about the vibration response is obtained:

[0165]

[0166] β = T e ω g ;

[0167] In the formula, TR is the transmission ratio, λ is the dynamic amplification factor, β is the excitation frequency ratio, ω g is the external excitation frequency, unit: hertz.

[0168] After substitution and simplification, we get:

[0169]

[0170] Referring to the Kanai-Tajimi spectrum, the main frequency range ω g of the earthquake can be calculated, so TR is only related to the friction coefficient μ and the equivalent curvature radius R of the friction pendulum seismic isolation bearing. After determining the required seismic isolation efficiency TR and giving the design horizontal displacement D, the friction coefficient or the equivalent curvature radius can be determined according to the actual situation, and the other parameter is calculated, and so on. After repeated iteration and trial calculation, the optimal parameter combination that meets the actual situation is obtained.

[0171] The period of the friction pendulum seismic isolation bearing after accurate design is far away from the structure period, and the seismic deformation can be fully released. For example Figure 4 ​​​It is shown that in actual work, the period of the friction pendulum seismic isolation support under the action of a large earthquake is prolonged, the equivalent period gradually approaches the swing period, and better seismic isolation effect is obtained. On the other hand, the mass distribution of the original structure can be improved, the mass distribution of the structure tends to be uniform, brittle failure is not prone to occur under rare earthquakes, and the seismic toughness is improved.

[0172] All documents mentioned in the present application are incorporated by reference herein as if each individual document were incorporated by reference. In addition, it is to be understood that the application can be carried out by specifically different embodiments and that each disclosed embodiment can be combined with one another in other embodiments. Further, the scope of the claims herein is not limited to the specific embodiments described herein but also covers each and every conceivable combination of features claimed herein.

Claims

1. A support type swing isolation device based on a double spherical support, characterized by, The shock isolation device comprises: a shock absorbing body; a support body for supporting the shock absorbing body placed thereon; and at least one double spherical bearing between the shock absorbing body and the support body; wherein a bottom surface of the double spherical bearing has a first curved surface convex downward, correspondingly, a top surface of the support body has an upper connecting concave curved surface concave downward, the first curved surface abuts against and is slidable along the upper connecting concave curved surface; a top surface of the double spherical bearing has a second curved surface convex upward, correspondingly, a bottom surface of the shock absorbing body has a lower connecting concave curved surface concave upward, the second curved surface abuts against and is slidable along the lower connecting concave curved surface; the shock absorbing body is swingable relative to the support body via the at least one double spherical bearing to isolate shock.

2. The shock isolation device of claim 1, wherein The double spherical bearing is a pie-shaped structure with a thick middle and thin edges.

3. The shock isolation device of claim 1, wherein The first curved surface and the second curved surface of the double spherical bearing, the lower connecting concave curved surface of the shock absorbing body and the upper connecting concave curved surface of the support body are all friction surfaces.

4. The shock isolation device of claim 1, wherein Centers of circles of the second curved surface, the first curved surface, the lower connecting concave curved surface of the shock absorbing body and the upper connecting concave curved surface of the support body are on a straight line.

5. The shock isolation device of claim 1, wherein The lower connecting concave curved surface of the shock absorbing body is provided with an extension part extending downward from an outer edge of the lower connecting concave curved surface of the shock absorbing body toward the support body, the extension part being used to define a movement range of the double spherical bearing corresponding to the shock absorbing body.

6. The shock isolation device of claim 1, wherein The shock isolation device has an equivalent curvature radius R, the equivalent curvature radius R being a sum of a radius R1 of the first curved surface and a radius R2 of the second curved surface minus a difference of a thickness d of the double spherical bearing, the R being in a range of 1-3 meters.

7. The shock isolation device of claim 6, wherein The equivalent curvature radius R is obtained by the following formula: In the formula, T S is the structural period, in seconds; M is a mass of the support body, unit: kg; m is a mass of the shock absorbing body, unit: kg; μ is a dynamic friction coefficient; D is a horizontal displacement of the double spherical bearing, unit: meter; g is a gravitational acceleration.

8. The shock isolation device of claim 7, wherein, Optimum frequency ratio f opt and optimum damping ratio ξ opt is calculated by the following equation:

9. The shock isolation device of claim 6, wherein, The equivalent curvature radius R is obtained by the following formula: In the formula, TR is a transmission ratio; ω g ω is the external excitation frequency, in Hertz; μ is a dynamic friction coefficient; D is a horizontal displacement of the double spherical bearing, unit: meter; g is a gravitational acceleration.

10. The shock isolation device of claim 9, wherein, The main frequency range ω of the earthquake is obtained by referring to the Kanai-Tajimi spectrum g , the required isolation efficiency TR is determined, and the design level displacement D is given, the friction coefficient μ or the equivalent curvature radius R is determined, and another parameter is calculated, and so on. After repeated iteration and trial calculation, the optimal parameter combination conforming to the actual situation is obtained.

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