Support type swing shock isolation device based on single spherical support

Abstract

The invention discloses a supporting type swing shock isolation device based on a single spherical 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 single spherical support is located between the damping main body and the supporting main body; wherein the single spherical support and the damping main body are fixed into a whole or integrally formed; a first curved surface protruding downwards is arranged on the bottom face of each single-spherical-surface support, correspondingly, an upper connecting concave curved surface concave downwards is arranged on the top face of the supporting body, the first curved surfaces abut against the upper connecting concave curved surface and can slide along the upper connecting concave curved surface, and the damping body can swing relative to the supporting body through at least one single-spherical-surface support so as to isolate shock. According to the shock isolation device, the earthquake acting force of the shock isolation device can be reduced through a supporting type swing shock isolation method, 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.

Description

Technical Field

[0001] The present invention relates to the field of shock absorption, and more particularly to a support type swing isolation device based on a single spherical bearing. Background Art

[0002] In existing thermal power plants, isolation connections are generally not adopted for devices, that is, all the mass of the devices participates in the seismic conditions. Due to the huge mass of some heavy equipment (such as coal hoppers, deaerators, various heaters, etc. in thermal power plants), taking a 600MW thermal power plant as an example, the full coal mass of a single device exceeds 1000t, the number of devices is 12 - 14, and the total mass exceeds 10000t; the full water mass of a single deaerator exceeds 800t, and the masses of various high and low heaters all exceed 150t, with the number being 5 - 8, and the total mass exceeding 1500t; these devices will generate huge seismic inertial forces, exerting huge horizontal seismic forces on the main structure. In addition, the uneven distribution of the mass of the main structure will cause irregularities, bringing greater seismic risks and higher construction costs. At the same time, the devices themselves are also prone to seismic damage.

[0003] The prior art has already explored certain isolation solutions for devices, such as using rubber isolation devices, suspension swing devices, composite shock absorption devices of rubber and dampers, etc. to reduce shock. The invention titled "Device Support Device" with the authorization announcement number CN102381524B discloses a technical solution for isolating devices using rubber or spring isolation bearings. The invention titled "Suspended Device Shock Absorption Structure for Improving the Seismic Performance of the Main Building of a Thermal Power Plant" with the authorization announcement number CN105544760B discloses a method of achieving swing isolation by suspending the device on the upper frame beam. The invention titled "Support Type Device Shock Absorption Structure for Improving the Seismic Performance of the Main Building of a Thermal Power Plant" with the authorization announcement number CN103088906B discloses a composite solution of rubber isolation bearings and dampers, which is to add dampers on the basis of a rubber 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 dampers to further reduce the influence of the seismic response of the device on the main structure and improve the effect of composite shock absorption.

[0004] However, the above - mentioned technical solutions still have various problems and cannot be put into actual engineering use at all:

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

[0006] 2. The suspension device is not as safe as the support device, and the suspension member itself will provide a certain amount of damping and stiffness, bringing deviation to its isolation design and reducing the isolation effect. At the same time, it will be damaged to a certain extent after an earthquake, and the left and right swinging at the epicenter will cause fatigue problems of the components, actually reducing the safety redundancy of the entire system. Moreover, the suspension device also needs to be equipped with additional dampers to limit the swing of the device, and it is not easy to replace after being damaged. The installation of the suspension device is relatively difficult and needs to be temporarily fixed in the air, resulting in an increase in construction costs.

[0007] 3. If a composite isolation and vibration reduction device of rubber and damper is adopted, first of all, it still has the problems of the above-mentioned rubber isolation device. Since its isolation bearing is controlled by the coal capacity in the device, the change in coal capacity will significantly affect its isolation period and isolation effect, the stiffness is unstable, and the added damper needs to adjust the stiffness through a certain optimization design algorithm, resulting in an increase in the complexity of the entire system and a decrease in practicality, and the vibration reduction effect is actually not ideal.

[0008] Therefore, there is still a lack in the art of a device that can effectively overcome the above problems and thus can perform vibration reduction more economically, conveniently, durably, efficiently and precisely. Summary of the Invention

[0009] The object of the present invention is to provide a support-type swinging isolation device based on a single spherical bearing. The support-type swinging isolation device can reduce its seismic force by the method of support-type swinging isolation, reduce the dynamic response of the main structure under seismic action, ensure its safety, and reduce the construction cost.

[0010] The present invention provides a support-type swinging isolation device based on a single spherical bearing. The isolation device includes:

[0011] A shock-absorbing main body;

[0012] A support main body, which is used to support the shock-absorbing main body placed thereon; and

[0013] At least one single spherical bearing, which is located between the shock-absorbing main body and the support main body;

[0014] Wherein the single spherical bearing is fixed integrally with or integrally formed with the shock-absorbing main body; the bottom surface of the single spherical bearing has a first curved surface convex downward, and correspondingly, the top surface of the support main body has an upper connecting concave curved surface concave downward. The first curved surface abuts against the upper connecting concave curved surface and can slide along the upper connecting concave curved surface. The shock-absorbing main body can swing relative to the support main body through at least one single spherical bearing to isolate vibration.

[0015] In another preferred example, the radius of curvature of the first curved surface of each spherical bearing is the same; correspondingly, the radius of curvature of each upper connecting concave curved surface of the support main body is the same.

[0016] In another preferred example, the first curved surface of the single spherical bearing and the upper connecting concave curved surface of the support main body are both friction surfaces.

[0017] In another preferred example, the centers of the circles where the first curved surface of the single spherical bearing and the upper connecting concave curved surface of the support main body are located are on a straight line.

[0018] In another preferred example, an extension part is provided at the lower part of the shock-absorbing main body. The extension part is a part extending downward from the outer edge of the lower part of the shock-absorbing main body toward the support main body, and the extension part is used to define the movement range of the single spherical bearing relative to the shock-absorbing main body.

[0019] In another preferred example, the shock isolation device has an equivalent radius of curvature R, and the equivalent radius of curvature R is the radius R1 of the first curved surface. The range of R is 1-3 meters.

[0020] The present invention provides a support type swing shock isolation device, and the shock isolation device includes:

[0021] A shock-absorbing main body;

[0022] A support main body for supporting the shock-absorbing main body placed thereon; and

[0023] At least one spherical bearing located between the shock-absorbing main body and the support main body;

[0024] Wherein the bottom surface of the spherical bearing has a first curved surface convex downward, and correspondingly, the top surface of the support main body has an upper connecting concave curved surface concave downward. The first curved surface abuts against the upper connecting concave curved surface and can slide along the upper connecting concave curved surface. The shock-absorbing main body can swing relative to the support main body through at least one spherical bearing to isolate vibration.

[0025] In another preferred example, the shock-absorbing main body is a non-powered device, such as a coal hopper, a deaerator, a heat exchanger, etc.

[0026] In another preferred example, the supporting body is made of steel structure or concrete structure.

[0027] In another preferred example, the pipeline connected to the shock-absorbing body is flexibly connected with materials such as metal hoses. The deformation capacity of the flexible connection should consider the design that the seismic force during an earthquake will not cause damage to the pipeline.

[0028] In another preferred example, the spherical bearing is fixed integrally with the shock-absorbing body.

[0029] In another preferred example, the spherical bearing and the shock-absorbing body are integrally formed.

[0030] In another preferred example, the spherical bearing and the shock-absorbing body are independent components.

[0031] In another preferred example, the spherical bearing has a disc-shaped structure with a thick middle and thin edges.

[0032] In another preferred example, the spherical bearings are arranged at uniform intervals to support the device body.

[0033] In another preferred example, the top surface of the spherical bearing has an upwardly convex second curved surface. Correspondingly, the bottom surface of the shock-absorbing body has a downwardly concave lower connecting concave curved surface. 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.

[0034] In another preferred example, the radius of curvature of the first curved surface of each spherical bearing is the same; the radius of curvature of the second curved surface of each spherical bearing is the same.

[0035] In another preferred example, the radius of curvature of each upper connecting concave curved surface of the supporting body is the same.

[0036] In another preferred example, the radius of curvature of each lower connecting concave curved surface of the shock-absorbing body is the same.

[0037] In another preferred example, the first curved surface and the second curved surface of the spherical bearing, 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.

[0038] It should be noted that the friction coefficients of the second curved surface and the first curved surface of the spherical bearing, the lower connecting concave curved surface of the shock-absorbing body, and the upper connecting concave curved surface of the supporting body can be designed according to actual needs, and they can be the same or different.

[0039] In another preferred example, the friction between the spherical bearing and the shock-absorbing body is greater than the friction between the surface bearing and the supporting body.

[0040] In another preferred example, the centers of the circles where the second curved surface of the spherical bearing, the first curved surface, the lower connecting concave curved surface of the shock-absorbing main body, and the upper connecting concave curved surface of the supporting main body are all on a straight line.

[0041] In another preferred example, the lower connecting concave curved surface of the shock-absorbing main body is provided with an extension part, and the extension part is a part extending downward from the outer edge of the lower connecting concave curved surface of the shock-absorbing main body towards the supporting main body. The extension part is used to define the movement range of the spherical bearing relative to the shock-absorbing main body. That is to say, it defines the swing amplitude of the shock-absorbing main body, so that the shock-absorbing main body will not have excessive swing and slip or tip over.

[0042] In another preferred example, the isolation device has an equivalent curvature radius R, and the equivalent curvature radius R is the difference between 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 bearing. The range of R is 1 - 3 meters. Preferably, the ratio of R1 to R2 is 0.8 - 1.2; more preferably, the ratio of R1 to R2 is 1, that is, R1 = R2.

[0043] In another preferred example, when the spherical bearing and the shock-absorbing main body are fixed together or integrally formed, the isolation device has an equivalent curvature radius R which is the radius R1 of the first curved surface.

[0044] In another preferred example, the equivalent curvature radius R is obtained by the following formula:

[0045]

[0046] In the formula, T S is the structural period, unit: second;

[0047] M is the mass of the supporting main body, unit: kilogram;

[0048] m is the mass of the shock-absorbing main body, unit: kilogram;

[0049] μ is the dynamic friction coefficient;

[0050] D is the horizontal displacement of the spherical bearing, unit: meter;

[0051] g is the acceleration due to gravity.

[0052] In another preferred example, the structural period T is obtained based on design parameters and actual conditions S 、the mass M of the supporting main body, the mass m of the shock-absorbing main body, the dynamic friction coefficient μ, and the horizontal displacement D of the spherical bearing, and substituting them into the above formula to obtain the equivalent curvature radius R.

[0053] In another preferred example, the optimal frequency ratio f optand the optimal damping ratio ξ opt It is obtained by calculating with the following formula:

[0054]

[0055] In another preferred example, the equivalent curvature radius R is obtained by the following formula:

[0056]

[0057] In the formula, TR is the conduction ratio;

[0058] ω g is the external excitation frequency, unit: Hertz;

[0059] μ is the dynamic friction coefficient;

[0060] D is the horizontal displacement of the spherical bearing, unit: meter;

[0061] g is the acceleration of gravity.

[0062] In another preferred example, the main frequency range ω of the earthquake is obtained by referring to the Kanai-Tajimi spectrum g , the required seismic 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 then another parameter is calculated. After such repeated iterative calculations, an optimal parameter combination that conforms to the actual situation is obtained.

[0063] It should be understood that within the scope of the present invention, the above-mentioned technical features of the present invention and the technical features specifically described below (such as in the embodiments) can be combined with each other to form new or preferred technical solutions. Due to space limitations, they will not be elaborated one by one here. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0065] Figure 1 is a schematic diagram of a supported swing seismic isolation device based on a single spherical bearing in an example of the present invention;

[0066] Figure 2 shows the equivalent curvature radius R of the seismic isolation device of a single spherical bearing in an example of the present invention;

[0067] Figure 3It is the schematic diagram of the seismic isolation device of the single spherical bearing in an example of the present invention based on tuned mass damping;

[0068] Figure 4 It is the comparison of the seismic resistance effects between the seismic isolation device of the single spherical bearing in an example of the present invention and the non-seismic isolation building.

[0069] In each attached drawing, each label is as follows:

[0070] 1 - damping main body;

[0071] 2 - support main body;

[0072] 3 - single spherical bearing;

[0073] 4 - first curved surface;

[0074] 5 - upper connecting concave curved surface. Detailed implementation manner

[0075] Through extensive and in-depth research and a large number of screenings, the inventor of the present invention has developed for the first time a supported swinging seismic isolation device based on a single spherical bearing. Compared with the prior art, the supported swinging seismic isolation device of the present invention can reduce its seismic force by using the method of supported swinging seismic isolation, reduce the dynamic response of the main structure under seismic action, ensure its safety, and reduce the construction cost. The present invention has been completed on this basis.

[0076] Terms

[0077] As used herein, the term "support main body" refers to that in a multi-story industrial plant, due to process requirements, some heavy equipment will be placed on the floor. For such equipment, a support main body (such as a steel pier, a concrete pier, a skateboard pier, etc.) needs to be set on the floor to transfer the equipment load to the support main body.

[0078] As used herein, the term "coal hopper", also called raw coal bunker, is a container for temporarily storing coal before the coal enters the coal mill in a thermal power plant. It is supported or suspended in the coal bunker room, and the coal hopper can be made of steel structure or concrete structure.

[0079] As used herein, the term "seismic isolation" refers to a measure of reducing and isolating seismic response by extending the structural period and making the structure softer.

[0080] As used herein, the term "swinging" means that under the action of a horizontal force, it can swing left and right, but will eventually stop vibrating due to damping energy dissipation.

[0081] The present invention provides a supported swinging seismic isolation device, which is a supported swinging seismic isolation device with a specific structure.

[0082] Typically, the supported device of the present invention belongs to the technology of equipment seismic isolation. The seismic isolation main body is placed on the support main body, and the support main body is the structure of the coal bunker room in a thermal power plant, which can be a frame structure or a concrete structure. The seismic isolation main body can be a concrete device or a steel device. The seismic isolation main body is a conventional device, and the connection point between the seismic isolation main body and the support main body adopts a spherical bearing (similar to the building friction pendulum seismic isolation bearing), so that when the support main body sways left and right under the influence of an earthquake, the seismic isolation main body can swing relatively with the support main body, resulting in a smaller influence of inertial force on it. Multiple spherical bearings can be placed around the seismic isolation main body. To ensure that the seismic isolation main body has only one determined period, these spherical bearings of the support device should have exactly the same radius of curvature. The seismic isolation main body adopts a lower support method, and the connection between the lower bearing and the support main body is supported on the spherical surface of the metal bearing, and a friction material is set on the spherical surface. Different surface materials can be filled on the interface of the spherical bearing to generate different frictional forces, playing a role in energy dissipation.

[0083] The supported swing seismic isolation device of the present invention is actually a sliding seismic isolation technology. By separating the support main body or the foundation from the protected part, the seismic force transmitted from the foundation to the superstructure is greatly reduced, and the maximum transmitted horizontal force is the maximum frictional force, thus playing a role in seismic isolation to protect the support main body.

[0084] According to the relevant content of GB / T 37358—2019 "Building Friction Pendulum Seismic Isolation Bearing", the swing period T (unit: second) of the friction pendulum seismic isolation bearing is:

[0085]

[0086] In the formula, R′ is the swing radius, unit: meter; g is the acceleration of gravity, usually taken as 9.81 m / s 2 .

[0087] The equivalent stiffness K of the friction pendulum seismic isolation bearing eff (unit: N / m) is:

[0088]

[0089] In the formula: R is the equivalent radius of curvature, unit: meter; μ is the dynamic friction coefficient; D is the horizontal displacement of the spherical bearing, unit: meter; P is the vertical load on the spherical bearing, unit: N.

[0090] The equivalent period T of the friction pendulum seismic isolation bearing e (unit: second) is:

[0091]

[0092] The equivalent damping ratio of the friction pendulum seismic isolation bearing is:

[0093]

[0094] It can be seen that the equivalent period T of the friction pendulum isolation support is e It has nothing to do with 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 earthquakes of different intensities, producing an energy-consuming effect, without the need for additional dampers, making its construction and installation simple and reducing costs.

[0095] Method 1: From the perspective of tuned mass vibration reduction, the principle diagram is as follows Figure 4 shown.

[0096] From the perspective of tuned mass damping, the belt device and related building structures can be simplified into a double-degree-of-freedom mass string model, in which the supporting body and the damping body are simplified to M and m degrees of freedom respectively. The dynamic equation is:

[0097]

[0098] Where, M is the mass of the supporting body, unit: kilogram; m is the mass of the shock absorbing body, unit: kilogram; is the acceleration of the supporting body (relative acceleration), unit: m / s 2 ; The acceleration of the shock absorber (relative acceleration), unit: m / s 2 ; C is the support body damping, unit: Ns / m; c is the shock absorber body damping, unit: Ns / m; and is the velocity, unit: m / s; X and x are displacements, unit: m; K is the stiffness of the supporting body, unit: N / m; k is the stiffness of the shock absorbing body, unit: N / m; The unit of earthquake ground acceleration is m / s 2 .

[0099] At this time, the optimal frequency ratio f based on the mass ratio γ can be obtained according to the simplex optimization algorithm. opt and the optimal damping ratio ξ opt The following is an example calculation formula:

[0100]

[0101] Combined with the above formula, when the mass ratio, structural period and other related parameters are given, the parallel equation is:

[0102]

[0103] Where, T S is the structural period, unit: seconds.

[0104] It can be obtained that:

[0105]

[0106] Method 2: Starting from the isolation theory, for the harmonic excitation acting on a single-degree-of-freedom isolation structure, the following derivation of the vibration response is as follows:

[0107]

[0108] β = T e ω g ;

[0109] In the formula, TR is the transmission ratio, λ is the dynamic magnification factor, β is the excitation frequency ratio, and ω g is the external excitation frequency, unit: Hertz.

[0110] Substituting and simplifying, it can be obtained that:

[0111]

[0112] Referring to the Kanai-Tajimi spectrum, the main frequency range ω of the earthquake can be calculated. g , so TR is only related to the friction coefficient μ and the equivalent radius of curvature R of the friction pendulum isolation bearing. After determining the required isolation efficiency TR and given the design horizontal displacement D, the friction coefficient or the equivalent radius of curvature can be determined according to the actual situation, and then the other parameter can be calculated. After repeated iterative calculations, the optimal parameter combination that conforms to the actual situation can be obtained.

[0113] The main advantages of the present invention include:

[0114] (a) The stiffness of the device and the isolation period of the device itself are little affected by the capacity in the device (such as coal capacity, water capacity, etc.), and the isolation effect is reliable.

[0115] (b) The device does not require additional dampers, the construction is simple, the structure is simple and reliable, and the construction cost is reduced.

[0116] (c) The device is undamaged under a major earthquake and does not need to be replaced after the earthquake; and the device can return to its original position under the action of gravity after the earthquake without adjustment, and has better seismic toughness.

[0117] (d) If maintenance is required due to accidental reasons, replacement is also relatively easy, reducing the replacement cost.

[0118] (e) The durability of the supporting main metal structure is good.

[0119] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, the attached drawings are schematic diagrams, so the devices and equipment of the present invention are not limited by the dimensions or scales of the schematic diagrams.

[0120] It should be noted that in the claims and the specification of this patent, relational 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 these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one" does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

[0121] Embodiment

[0122] The swing isolation device based on a single spherical bearing in this embodiment is as Figure 1 shown. The isolation device includes a shock-absorbing main body 1 (shown as a horizontal deaerator), a support main body 2 for supporting the shock-absorbing main body 1 placed thereon, and four single spherical bearings 3 evenly spaced between the shock-absorbing main body 1 and the support main body 2.

[0123] As Figure 2 shown, the single spherical bearing 3 is fixed integrally with or integrally formed with the shock-absorbing main body 1. The bottom surface of the single spherical bearing 3 has a first curved surface 4 that protrudes downward. Correspondingly, the top surface of the support main body 2 has an upper connecting concave curved surface 5 that concaves downward. The first curved surface 4 abuts against the upper connecting concave curved surface 5 and can slide along the upper connecting concave curved surface 5. The shock-absorbing main body 1 can swing relative to the support main body 2 through the four single spherical bearings 3 to isolate vibration.

[0124] Both the first curved surface 4 and the upper connecting concave curved surface 5 of the support main body 2 are friction surfaces. Among the four single spherical bearings 3, the curvature radius of the first curved surface 4 of each single spherical bearing 3 is the same. Correspondingly, the curvature radius of each upper connecting concave curved surface 5 of the support main body 2 is the same. The centers of the circles where the first curved surface 4 of the single spherical bearing 3 and the upper connecting concave curved surface 5 of the support main body 2 are located are on the same straight line.

[0125] The lower part of the shock-absorbing main body 1 is provided with an extension part (not shown), and the extension part is a part extending downward from the outer edge of the lower connecting concave curved surface 7 of the shock-absorbing main body 1 towards the support main body 2. The extension part is used to define the movement range of the single spherical bearing 3 relative to the shock-absorbing main body 1. That is to say, the swing amplitude of the shock-absorbing main body 1 is limited, so that the shock-absorbing main body 1 will not have excessive swing and slip or tip over.

[0126] The following specifically describes how to obtain the optimal equivalent curvature radius R of the single spherical bearing (i.e., the radius R1 of the first curved surface 4).

[0127] 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:

[0128]

[0129] In the formula, R′ is the swing radius, unit: meter; g is the acceleration due to gravity, usually taken as 9.81m / s 2 .

[0130] The equivalent stiffness K of the friction pendulum isolation bearing eff (unit: N / m) is:

[0131]

[0132] In the formula: R is the equivalent curvature radius, unit: meter; μ is the dynamic friction coefficient; D is the horizontal displacement of the single spherical bearing 3, unit: meter; P is the vertical load borne by the single spherical bearing 3, unit: Newton.

[0133] The equivalent period T of the friction pendulum isolation bearing e (unit: second) is:

[0134]

[0135] The equivalent damping ratio of the friction pendulum isolation bearing is:

[0136]

[0137] It can be seen that the equivalent period T of the friction pendulum isolation bearing e has nothing to do with 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 earthquakes of different intensities, producing an energy-consuming effect, without the need to additionally set up dampers, making its construction and installation simple and reducing the cost.

[0138] Method 1: Starting from the perspective of tuned mass damping, its schematic diagram is as Figure 3 shown.

[0139] From the perspective of tuned mass damping, the belt device and related building structures can be simplified into a double-degree-of-freedom mass string model, in which the support body 2 and the damping body 1 are simplified to M and m degrees of freedom respectively. The dynamic equation is:

[0140]

[0141] Wherein, M is the mass of the supporting body 2, unit: kilogram; m is the mass of the shock absorbing body 1, unit: kilogram; is the acceleration of the supporting body 2 (relative acceleration), unit: m / s 2 ; is the acceleration of the shock absorbing body 1 (relative acceleration), unit: m / s 2 ; C is the damping of the supporting 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 displacements, unit: m; K is the stiffness of the supporting body 2, unit: N / m; k is the stiffness of the shock absorbing body 1, unit: N / m; The unit of earthquake ground acceleration is m / s 2 .

[0142] At this time, the optimal frequency ratio f based on the mass ratio γ can be obtained according to the simplex optimization algorithm. opt and the optimal damping ratio ξ opt The following is an example calculation formula:

[0143]

[0144] Combined with the above formula, when the mass ratio, structural period and other related parameters are given, the parallel equation is:

[0145]

[0146] Where, T S is the structural period, unit: seconds.

[0147] We can get:

[0148]

[0149] That is to say, the structural period T is obtained by the design parameters and the actual situation. S , the mass M of the supporting body 2, the mass m of the shock absorbing body 1, the dynamic friction coefficient μ and the horizontal displacement D of the single spherical support 3 are substituted into the following formula to obtain the equivalent radius of curvature R. Substituting into the above formula, the optimal frequency ratio f can be obtained opt and the optimal damping ratio ξ opt .

[0150]

[0151] Wherein, T S is the structural period, unit: second;

[0152] M is the mass of the support main body 2, unit: kilogram;

[0153] m is the mass of the shock absorption main body 1, unit: kilogram;

[0154] μ is the dynamic friction coefficient;

[0155] D is the horizontal displacement of the single spherical bearing 3, unit: meter;

[0156] g is the acceleration due to gravity.

[0157] The range of R is 1 - 3 meters.

[0158] An example of the calculation process using the tuned mass damping method is as follows: The period T of the main plant building 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 shock absorption main body 1 to the support main body 2 is taken as 0.6 and the structural period T S is taken as 1.5s, then the optimal frequency ratio f opt is 0.625, and at this time the equivalent period T e of the device is 2.4s. When the horizontal design displacement D is taken as 100mm, the friction coefficient μ of the required friction pendulum isolation bearing is 0.041, and the equivalent curvature radius R is about 3479mm.

[0159] Method 2: If starting from the isolation theory, for the simple harmonic excitation acting on the single-degree-of-freedom isolation structure, the following derivation of the vibration response is as follows:

[0160]

[0161] β = T e ω g ;

[0162] Wherein, TR is the conduction ratio, λ is the dynamic amplification factor, β is the excitation frequency ratio, and ω g is the external excitation frequency, unit: hertz.

[0163] Substituting and simplifying gives:

[0164]

[0165] Referring to the Kanai-Tajimi spectrum, the main frequency range ω of the earthquake can be calculated g, so 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 given the design horizontal displacement D, the friction coefficient or the equivalent curvature radius can be determined according to the actual situation, and then the other parameter can be calculated. After repeated iterative calculations, the optimal parameter combination that conforms to the actual situation can be obtained.

[0166] After accurate design, the period of the friction pendulum isolation bearing is far from the structural period, and the seismic deformation can be fully released. As Figure 4 shown, in actual work, the period of the friction pendulum isolation bearing is extended under the action of a major earthquake, and the equivalent period will gradually approach the swing period, having a better isolation effect. On the other hand, it can improve the mass distribution of the original structure, making the mass distribution of the structure tend to be uniform, and it is not easy to appear brittle damage under rare earthquakes, improving the seismic toughness.

[0167] All documents mentioned in the present invention are cited herein as references, as if each document was individually cited as a reference. In addition, it should be understood that after reading the above teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of this application.

Claims

1. A support-type swing isolation device based on a single spherical support, characterized in that: The seismic isolation device comprises: Shock-absorbing body; a supporting body, the supporting body being used to support the shock absorbing body placed thereon; and at least one single spherical support, the single spherical support being located between the damping body and the supporting body; The single spherical support is fixed to or formed integrally with the shock-absorbing body; the bottom surface of the single spherical support has a first curved surface convex downward, and correspondingly, the top surface of the supporting body has an upper connecting concave curved surface concave downward, the first curved surface abuts against the upper connecting concave curved surface and can slide along the upper connecting concave curved surface, and the shock-absorbing body can swing relative to the supporting body through at least one of the single spherical support to isolate shocks.

2. The seismic isolation device according to claim 1, characterized in that: The curvature radius of the first curved surface of each of the spherical supports is the same; correspondingly, the curvature radius of each of the upper connecting concave curved surfaces of the support body is the same.

3. The seismic isolation device according to claim 1, characterized in that: The first curved surface of the single spherical support and the upper connecting concave curved surface of the supporting body are both friction surfaces.

4. The seismic isolation device according to claim 1, characterized in that: The centers of the first curved surface of the single spherical support and the circle where the upper connecting concave curved surface of the supporting body lies are on a straight line.

5. The seismic isolation device according to claim 1, characterized in that: An extension portion is provided at the lower portion of the shock absorbing body, wherein the extension portion is a portion extending downward from the lower outer edge of the shock absorbing body toward the supporting body, and the extension portion is used to limit the movement range of the single spherical support equivalent to the shock absorbing body.

6. The seismic isolation device according to claim 1, characterized in that: The seismic isolation device has an equivalent curvature radius R, which is the radius R1 of the first curved surface, and the range of R is 1-3 meters.

7. The seismic isolation device according to claim 6, characterized in that: The equivalent radius of curvature R is obtained by the following formula: Where, T S is the structural period, unit: second; M is the mass of the supporting body, unit: kilogram; m is the mass of the shock absorber body, unit: kilogram; μ is the coefficient of dynamic friction; D is the horizontal displacement of the single spherical bearing, unit: meter; g is the acceleration due to gravity.

8. The seismic isolation device according to claim 7, characterized in that: Optimal frequency ratio f opt and the optimal damping ratio ξ opt Calculated by the following formula:

9. The seismic isolation device according to claim 6, characterized in that: The equivalent radius of curvature R is obtained by the following formula: Where TR is the conduction ratio; ω g is the external excitation frequency, unit: Hz; μ is the coefficient of dynamic friction; D is the horizontal displacement of the single spherical bearing, unit: meter; g is the acceleration due to gravity.

10. The seismic isolation device according to claim 9, characterized in that: The main frequency range ω of the earthquake is obtained by referring to the Kanai-Tajimi spectrum g , determine the required isolation efficiency TR and given the design horizontal displacement D, determine the friction coefficient μ or the equivalent curvature radius R, and then calculate another parameter. After repeated iterative trials, the optimal parameter combination that meets the actual situation is obtained.

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