CN113389289B - Bridge type self-resetting support with energy consumption amplification function - Google Patents
Bridge type self-resetting support with energy consumption amplification function Download PDFInfo
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- CN113389289B CN113389289B CN202110624716.9A CN202110624716A CN113389289B CN 113389289 B CN113389289 B CN 113389289B CN 202110624716 A CN202110624716 A CN 202110624716A CN 113389289 B CN113389289 B CN 113389289B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
- E04H9/023—Bearing, supporting or connecting constructions specially adapted for such buildings and comprising rolling elements, e.g. balls, pins
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
- E04H9/0237—Structural braces with damping devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Abstract
The invention provides an energy-consumption amplification composite bridge type self-resetting supporting device which comprises an external bridge type chain rod system, an internal energy-consumption system and a resetting system, wherein the external bridge type chain rod system is connected with the external bridge type chain rod system through a connecting rod; the external bridge type chain rod system is in an octagonal structure, is of an approximate diamond structure, comprises two stressed chain rods, two loading chain rods and four transmission chain rods, and is hinged. The two stressed chain rods are respectively hinged with two ends of the internal energy consumption system, and the internal energy consumption system is used for absorbing energy input from the outside; the two loading chain rods are respectively hinged with two ends of the reset system, and the reset system is used for resetting the deformed internal energy consumption system. The invention can adjust the energy consumption mechanism according to the requirement of the energy consumption mechanism, and can simultaneously arrange single, compound or combination of multiple energy consumption mechanisms; and through the amplification function of the bridge type chain rod structure, the displacement of an internal energy consumption system can be multiplied by adjusting the included angle of the chain rods, so that the energy absorbed by the energy consumption system is increased, and the defect of low energy consumption capability of the conventional self-resetting support is overcome.
Description
Technical Field
The invention relates to the technical field of civil construction structures, in particular to an automatic reset supporting structure, and particularly relates to a bridge type self-reset support with an energy consumption amplification function.
Background
Although casualties caused by a plurality of strong earthquakes are reduced in recent years, the aim of falling down by large earthquakes is achieved by the earthquake-proof design structure, the use function of the building is interrupted due to excessive residual deformation of the structure after the earthquake, and high maintenance cost is generated. Research shows that when the residual interlayer displacement angle after the structure earthquake exceeds 0.5%, the repair cost is higher than the reconstruction cost. The self-reset support can realize that the residual deformation of the structure after the earthquake is close to zero, and can realize the recovery of the use function without repair after the earthquake.
The connection between an energy consumption system and a reset system in the existing self-reset energy consumption support is too complicated, and the processing process is complicated; the performance characteristics of the damper in the existing energy consumption system are too single, and the damper cannot simultaneously meet external load conditions of various different forms; the complexity of the resetting system and the energy consumption system reduces the energy consumption capability of the support, and the energy consumption capability is limited; the traditional damper under the low displacement level can not consume energy effectively, lacks the displacement amplification function.
Disclosure of Invention
In view of the above technical problems, an energy-consuming amplifying composite bridge type self-resetting support device is provided.
The technical means adopted by the invention are as follows:
an energy-consumption amplification composite bridge type self-resetting support device comprises an external bridge type chain rod system, an internal energy-consumption system and a resetting system;
the external bridge type chain rod system comprises a central point, stress chain rods which are horizontally arranged are symmetrically arranged on the upper side and the lower side of the central point respectively, loading chain rods which are vertically arranged are symmetrically arranged on the left side and the right side of the central point respectively, the stress chain rods which are positioned on the upper side are higher than the upper ends of the loading chain rods, and the stress chain rods which are positioned on the lower side are lower than the lower ends of the loading chain rods; the two ends of the upper stressed chain rod are connected with the upper end of the loading chain rod close to the end part of the stressed chain rod, the two ends of the lower stressed chain rod are connected with the lower end of the loading chain rod close to the end part of the stressed chain rod through obliquely arranged transmission chain rods, and the two ends of the transmission chain rods are hinged with the stressed chain rod and the loading chain rod respectively;
the two stressed chain rods are respectively hinged with two ends of the internal energy consumption system, and the internal energy consumption system is used for absorbing externally input energy and blocking the external bridge type chain rod system from deforming;
the two loading chain rods are respectively hinged with two ends of the reset system, and the reset system is used for resetting the deformed internal energy consumption system.
The length of the stressed chain rod and the length of the loading chain rod are both smaller than the length of the transmission chain rod.
Preferably, the internal energy consumption system and the reset system are crossed, and a through cavity for the internal energy consumption system to pass through is arranged at the crossing of the reset system, or a through cavity for the reset system to pass through is arranged at the crossing of the internal energy consumption system.
Preferably, the reset system comprises control outer plates which are symmetrically arranged in front and back, two ends of each of the two control outer plates are respectively and fixedly connected with two constraint bottom plates which are symmetrically arranged in left and right, and reset subunits are respectively and symmetrically arranged at left and right ends of a cavity formed by the constraint bottom plates and the control outer plates;
the reset subunit comprises a loading shaft, one end of the loading shaft is hinged to the loading chain rod, the other end of the loading shaft penetrates through the constraint bottom plate and enters the cavity, shaft shoulder bulges are machined at one end, far away from the constraint bottom plate, of the loading shaft and positions, close to the constraint bottom plate, in the cavity, of the loading shaft, two sliding blocks are sleeved on the part, between the two shaft shoulder bulges, of the loading shaft, each sliding block abuts against the shaft shoulder bulge close to the sliding block, a pre-tightening elastic piece is arranged between the two sliding blocks, the sliding blocks are in contact connection with the control outer plate, and the two sliding blocks are respectively abutted against the end face of a stop machined on the control outer plate by the pre-tightening elastic piece;
and a space surrounded by the two sliding blocks positioned in the middle and the control outer plate forms the through cavity for the internal energy consumption system to pass through.
Furthermore, the pre-tightening elastic piece is one or a combination of a plurality of combined disc springs, ring springs, compression springs, intelligent materials SMA and pre-stressing tendons.
Preferably, the internal energy consumption system is one, composite or combination of multiple of a friction energy consumption system, a metal buckling-restrained energy consumption system, a viscous damping energy consumption system and a magnetorheological damping energy consumption system. The composite finger internal energy consumption system comprises the two energy consumption mechanisms.
The invention discloses a condition that the internal energy consumption system is a friction energy consumption system, the friction energy consumption system comprises two friction outer plates and a friction inner plate, the lower end of the friction inner plate is hinged with the stressed chain rod positioned below, the upper ends of the two friction outer plates are hinged with the stressed chain rod positioned above, the upper part of the friction inner plate is clamped between the two friction outer plates, a friction material is arranged between the two friction outer plates and the friction inner plate, a plurality of vertically arranged slideways are arranged on the friction outer plates, and pre-tightening bolts penetrate through the slideways and the friction inner plate.
The invention discloses a condition that the internal energy consumption system is a metal buckling-restrained energy consumption system, which comprises an internal energy consumption steel bar, wherein the upper end and the lower end of the internal energy consumption steel bar are respectively hinged with two stressed chain rods, an external high-strength steel pipe is sleeved outside the internal energy consumption steel bar, a plurality of radial bulges are processed on the internal energy consumption steel bar, and the radial bulges are in contact connection with the inner wall of the external high-strength steel pipe.
The invention discloses a condition that the internal energy consumption system is a viscous damping energy consumption system, which comprises a loading steel bar, a piston, damping holes and an outer sleeve steel pipe, wherein one end of the loading steel bar is hinged with one stressed chain rod, one end of the outer sleeve steel pipe is hinged with the other stressed chain rod, the loading steel bar penetrates into the outer sleeve steel pipe, the part of the loading steel bar, which is positioned in the outer sleeve steel pipe, is fixedly connected with the piston, the piston is in damping fit with the outer sleeve steel pipe, and the piston is provided with a plurality of damping holes.
The invention discloses a case that the internal energy consumption system is a combination of a friction energy consumption system and a viscous damping energy consumption system; the friction energy dissipation system is positioned between the two viscous damping energy dissipation systems;
the friction energy dissipation system comprises two friction outer plates and a friction inner plate, the lower end of the friction inner plate is hinged with the stressed chain rod positioned below, the upper ends of the two friction outer plates are hinged with the stressed chain rod positioned above, the upper part of the friction inner plate is clamped between the two friction outer plates, a plurality of vertically arranged slide ways are arranged on the friction outer plates, and pre-tightening bolts penetrate through the slide ways and the friction inner plate;
viscous damping energy dissipation system includes loading rod iron, piston, damping hole and overcoat steel pipe, the one end and one of them of loading rod iron the atress chain pole is articulated, the one end and the other of overcoat steel pipe the atress chain pole is articulated, just the loading rod iron penetrates in the overcoat steel pipe, the loading rod iron is located the intraductal part of overcoat steel with piston fixed connection, just the piston with overcoat steel pipe damping cooperation, the piston has a plurality ofly the damping hole.
The working principle is as follows: before loading, the resetting system applies initial pre-pressure which is higher than the yield bearing capacity of the internal energy consumption system, so that the internal energy consumption system can be completely reset, and the support residual deformation is eliminated or only low residual deformation exists. In the loading process, the resetting system drives the rotating chain rod to rotate through the loading chain rod so as to drive the stressed chain rod to displace, the loading chain rod drives the resetting system to reciprocate under the action of external load, the loading shaft pushes the sliding block to compress the combined disc spring to generate compression deformation and generate elastic pressure, the stressed chain rod drives the internal energy consumption system to reciprocate to generate energy consumption, the displacement acting on the loading chain rod amplifies the displacement of the internal energy consumption system through the amplification effect of the external bridge type chain rod system, the energy absorbed by the support is further multiplied under the same displacement condition, the displacement of the resetting system is not changed, and the resetting system resets in the unloading process and eliminates the residual displacement of the internal energy consumption system through the setting of initial pre-pressure.
Compared with the prior art, the invention has the following advantages:
1. the internal energy consumption system and the reset system are relatively independent, the conflict between the support energy consumption capability and the reset capability is solved, and the complexity of structural installation is reduced.
2. According to the invention, through the amplification function of the bridge type chain rod structure, the displacement of the internal energy consumption system can be increased by times by adjusting the included angle of the chain rods, the support energy consumption capability is greatly improved, and the defect of low energy consumption capability of the conventional self-resetting support is avoided.
3. The internal energy consumption system can be provided with a single or multiple types of dampers to form the performance characteristics of the composite energy consumption damper, and the damping effect on external excitation of different levels or types is improved.
4. The reset system can be set into a disc spring, a ring spring, a compression spring or a prestressed tendon, an intelligent material SMA and the like, and only the structural form of the reset system needs to be properly adjusted.
For the reasons, the invention can be widely popularized in the fields of civil engineering support and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural view of an energy-consuming amplifying composite bridge type self-resetting supporting device in embodiment 1 of the present invention.
Fig. 2 is a schematic structural diagram of a recovery system in embodiments 1 to 4 of the present invention.
Fig. 3 is a schematic structural diagram of a friction energy dissipation system in embodiment 1 of the present invention.
Fig. 4 is a schematic structural view of an energy-consuming amplifying composite bridge type self-resetting supporting device in embodiment 2 of the present invention.
Fig. 5 is a schematic structural diagram of a metal buckling-restrained energy dissipation system in embodiments 2 and 4 of the present invention.
FIG. 6 is a schematic structural view of an internal energy consumption steel bar in examples 2 and 4 of the present invention.
Fig. 7 is a schematic structural view of an energy-consuming amplifying composite bridge type self-resetting supporting device in embodiment 3 of the present invention.
FIG. 8 is a schematic view showing the structure of an outer jacket steel pipe in examples 3 and 4 of the present invention.
Fig. 9 is a schematic structural view of a loaded steel bar in embodiments 3 and 4 of the present invention.
Fig. 10 is a schematic structural view of an energy-consuming amplifying composite bridge type self-resetting supporting device in embodiment 4 of the present invention.
FIG. 11 is a schematic diagram of embodiments 1 to 4 of the present invention.
FIG. 12 is a schematic diagram of different energy dissipation capabilities for different θ angles.
In the figure: 1. a drive chain bar; 2. a stressed chain bar; 3. loading the chain bar; 4. a hinge shaft; 5. resetting the system; 501. a control outer plate; 502. a combined disc spring; 503. a loading shaft; 504. a slider; 505. a restraint base plate; 506. through the lumen; 507. the shaft shoulder is raised; 508. stopping; 6. a friction energy dissipation system; 601. rubbing the inner plate; 602. rubbing the outer plate; 603. a bolt; 604. a slideway; 7. a metal buckling restrained energy dissipation system; 701. an outer high-strength steel pipe; 702. an internal energy consumption steel bar; 703. a radial projection; 8. a viscous damping energy dissipation system; 801. loading a steel bar; 802. a piston; 803. a damping hole; 804. and (5) coating a steel pipe externally.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. Any specific values in all examples shown and discussed herein are to be construed as exemplary only and not as limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the absence of any contrary indication, these directional terms are not intended to indicate and imply that the device or element so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be considered as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … … surface," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
Example 1
As shown in fig. 1 to 3 and 11 to 12, an energy-consuming and amplifying composite bridge type self-resetting support device includes an external bridge type chain bar system, an internal energy-consuming system and a resetting system 5;
the external bridge type chain rod system comprises a central point, wherein horizontally arranged stressed chain rods 2 are symmetrically arranged on the upper side and the lower side of the central point respectively, vertically arranged loading chain rods 3 are symmetrically arranged on the left side and the right side of the central point respectively, the stressed chain rods 2 positioned on the upper side are higher than the upper ends of the loading chain rods 3, and the stressed chain rods 2 positioned on the lower side are lower than the lower ends of the loading chain rods 3; the two ends of the upper stressed chain rod 2 are connected with the upper end of the loading chain rod 3 close to the end part of the stressed chain rod 2, the two ends of the lower stressed chain rod 2 are connected with the lower end of the loading chain rod 3 close to the end part of the stressed chain rod 2 through the obliquely arranged transmission chain rod 1, and the two ends of the transmission chain rod 1 are hinged with the stressed chain rod 2 and the loading chain rod 3 through hinge shafts 4;
the two stressed chain rods 2 are respectively hinged with two ends of the internal energy consumption system, and the internal energy consumption system is used for absorbing externally input energy and preventing the external bridge type chain rod system from deforming;
the two loading chain rods 3 are respectively hinged with two ends of the reset system 5, and the reset system 5 is used for resetting the deformed external bridge type chain rod system.
The internal energy consumption system and the reset system 5 are crossed, and a through cavity 506 through which the internal energy consumption system passes is arranged at the crossing of the reset system 5.
The reset system 5 comprises control outer plates 501 which are symmetrically arranged front and back, two ends of each of the two control outer plates 501 are respectively and fixedly connected with two constraint bottom plates 505 which are symmetrically arranged left and right, and reset subunits are respectively and symmetrically arranged at left and right ends of a cavity formed by the constraint bottom plates 501 and the control outer plates 505;
the reset subunit comprises a loading shaft 503, one end of the loading shaft 503 is hinged to the loading chain rod 3, the other end of the loading shaft 503 passes through the constraint bottom plate 505 and enters the cavity, a shaft shoulder protrusion 507 is machined at one end of the loading shaft 503, which is far away from the constraint bottom plate 505, and a position, which is located in the cavity and close to the constraint bottom plate 505, two sliding blocks 504 are sleeved on a part of the loading shaft 503 between the two shaft shoulder protrusions 507, each sliding block 504 abuts against the shaft shoulder protrusion 507, which is close to the sliding block, a pre-tightening elastic element is arranged between the two sliding blocks 504, the sliding blocks 504 are in contact connection with the control outer plate 501, and the two sliding blocks 504 are respectively abutted against the end faces of stoppers 508 machined on the control outer plate 501 by the pre-tightening elastic elements;
the space enclosed by the two middle sliders 504 and the control outer plate 501 constitutes the through cavity 506.
Further, the pre-tightening elastic element is a combination of one or more of a combination disc spring 502, a ring spring, a compression spring, a smart material SMA, and a pre-stressing tendon, and in this embodiment, the combination disc spring 502 is used.
The internal energy consumption system is one or a combination of a friction energy consumption system 6, a metal buckling-preventing energy consumption system, a viscous damping energy consumption system and a magneto-rheological damping energy consumption system.
In this embodiment, a friction energy dissipation system 6 is adopted, the friction energy dissipation system 6 includes two friction outer plates 602 and a friction inner plate 601, the lower end of the friction inner plate 601 is hinged to the stressed chain bar 2 located below, the upper ends of the two friction outer plates 602 are hinged to the stressed chain bar 2 located above, the upper portion of the friction inner plate 601 is sandwiched between the two friction outer plates 602, and a friction material is disposed between the two friction outer plates 602 and the friction inner part 601. A plurality of vertically arranged slideways 604 are arranged on the friction outer plate 602, and a pre-tightening bolt 603 penetrates through the slideways 604 and the friction inner plate 601.
The amplification principle is as follows: as shown in fig. 11, the external bridge type link system is composed of 8 link rods and 8 hinge shafts, in which the size of the rotating link rod 1 is L,
Δ L and 2H are input and output displacements, respectively, and R ═ 2H/Δl is defined as the amplification factor of the external bridge link system. When the input displacement Δ L is obtained from fig. 11, the diamond displacement amplification mechanism has the following relationship:
(Lcosθ+ΔL/2)2+(Lsinθ-H)2＝L2 (1)
finishing to obtain
By expanding equation (2) about Δ L by Taylor series, it can be expressed as
In the formula, Delta L is external excitation input displacement and is also displacement of the reset system; 2H is the output displacement of the rhombic displacement amplifying mechanism and is also the displacement of an energy consumption system; theta is an included angle of a horizontal connecting line between the rotating chain rod AB and the two loading chain rods in the initial state; l is the length of the rotating chain. When Δ L is much smaller than L, Δ L/L in the squared term can be considered as an infinitesimal negligible amount, resulting in a simplified linear expression of equation (3) as
The amplification factor can then be expressed as:
R＝2H/ΔL＝cotθ
in the formula, θ belongs to (0,45 °), displacement amplification is performed at this time, and the smaller θ is, the more obvious the amplification is, and the stronger the energy consumption capability is, as illustrated in fig. 12, the figure shows that the buckling restrained brace is used as an energy consumption system to perform numerical calculation on support devices at different angles to obtain a load-displacement hysteresis curve of the buckling restrained brace.
Example 2
As shown in fig. 4 to 6 and 11 to 12, the energy-amplifying composite bridge type self-resetting bracing device is different from that of embodiment 1 in that the internal energy-consuming system adopted in this embodiment is a metal buckling-restrained energy-consuming system 7, which includes an internal energy-consuming steel bar 702, the upper and lower ends of the internal energy-consuming steel bar 702 are respectively hinged to the two stressed chain rods 2, an outer high-strength steel pipe 701 is sleeved outside the internal energy-consuming steel bar 702, a plurality of radial protrusions 703 are processed on the internal energy-consuming steel bar 702, and the radial protrusions 703 are in contact connection with the inner wall of the outer high-strength steel pipe 701.
Example 3
As shown in fig. 7 to 9 and 11 to 12, an energy amplification composite bridge type self-resetting support device in this embodiment is different from that in embodiment 1, the internal energy consumption system adopted in this embodiment is a viscous damping energy consumption system 8, which includes a loading steel rod 801, a piston 802, a damping hole 803 and an outer steel tube 804, one end of the loading steel rod 801 is hinged to one of the stressed chain rods 2, one end of the outer steel tube 804 is hinged to the other stressed chain rod 2, the loading steel rod 801 penetrates into the outer steel tube 802, a portion of the loading steel rod 801 located in the outer steel tube 804 is fixedly connected to the piston 802, the piston 802 is in damping fit with the outer steel tube 804, and the piston 802 has a plurality of damping holes 803.
Example 4
As shown in fig. 5 to 6 and 8 to 12, in this embodiment, on the basis of embodiments 1 and 3, an internal energy consumption system adopts a combination of the friction energy consumption system 6 in embodiment 1 and the viscous damping energy consumption system 8 in embodiment 3; the friction energy dissipation system 6 is located between the two viscous damping energy dissipation systems 8.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. A composite bridge type self-resetting support device with energy consumption amplification is characterized by comprising an external bridge type chain rod system, an internal energy consumption system and a resetting system;
the external bridge type chain rod system comprises a central point, stress chain rods which are horizontally arranged are symmetrically arranged on the upper side and the lower side of the central point respectively, loading chain rods which are vertically arranged are symmetrically arranged on the left side and the right side of the central point respectively, the stress chain rods which are positioned on the upper side are higher than the upper ends of the loading chain rods, and the stress chain rods which are positioned on the lower side are lower than the lower ends of the loading chain rods; the two ends of the upper stressed chain rod are connected with the upper end of the loading chain rod close to the end part of the stressed chain rod, the two ends of the lower stressed chain rod are connected with the lower end of the loading chain rod close to the end part of the stressed chain rod through obliquely arranged transmission chain rods, and the two ends of the transmission chain rods are hinged with the stressed chain rod and the loading chain rod respectively;
the two stressed chain rods are respectively hinged with two ends of the internal energy consumption system, and the internal energy consumption system is used for absorbing energy input from the outside;
the two loading chain rods are respectively hinged with two ends of the reset system, and the reset system is used for resetting the deformed internal energy consumption system;
the internal energy consumption system and the reset system are crossed, a penetrating cavity for the internal energy consumption system to penetrate through is arranged at the crossing position of the reset system, or a penetrating cavity for the reset system to penetrate through is arranged at the crossing position of the internal energy consumption system;
the reset system comprises control outer plates which are symmetrically arranged front and back, two ends of the two control outer plates are respectively and fixedly connected with two constraint bottom plates which are symmetrically arranged left and right, and reset subunits are respectively and symmetrically arranged at the left and right ends of a cavity formed by the constraint bottom plates and the control outer plates;
the reset subunit comprises a loading shaft, one end of the loading shaft is hinged to the loading chain rod, the other end of the loading shaft penetrates through the constraint bottom plate and enters the cavity, shaft shoulder bulges are machined at one end, far away from the constraint bottom plate, of the loading shaft and positions, close to the constraint bottom plate, in the cavity, of the loading shaft, two sliding blocks are sleeved on the part, between the two shaft shoulder bulges, of the loading shaft, each sliding block abuts against the shaft shoulder bulge close to the sliding block, a pre-tightening elastic piece is arranged between the two sliding blocks, the sliding blocks are in contact connection with the control outer plate, and the two sliding blocks are respectively abutted against the end face of a stop machined on the control outer plate by the pre-tightening elastic piece;
and a space surrounded by the two sliding blocks positioned in the middle and the control outer plate forms the through cavity for the internal energy consumption system to pass through.
2. The composite bridge type self-resetting supporting device with energy consumption amplification of claim 1, wherein the pre-tightening elastic element is one or more of a composite disc spring, a ring spring, a compression spring, a smart material SMA and a pre-stressed tendon.
3. The composite bridge type self-resetting supporting device with energy dissipation and amplification functions as claimed in claim 1, wherein the internal energy dissipation system is one or more of a friction energy dissipation system, a metal buckling-restrained energy dissipation system, a viscous damping energy dissipation system and a magnetorheological damping energy dissipation system.
4. The composite bridge type self-resetting support device with energy dissipation and amplification functions as claimed in claim 3, wherein the internal energy dissipation system is a friction energy dissipation system, the friction energy dissipation system comprises two friction outer plates and a friction inner plate, the lower end of the friction inner plate is hinged to the stressed chain rod located below, the upper ends of the two friction outer plates are hinged to the stressed chain rod located above, the upper portion of the friction inner plate is clamped between the two friction outer plates, a friction material is arranged between the two friction outer plates and the friction inner plate, a plurality of vertically arranged slideways are arranged on the friction outer plates, and pre-tightening bolts penetrate through the slideways and the friction inner plate.
5. The composite bridge type self-resetting support device with energy dissipation and amplification functions as claimed in claim 3, wherein the internal energy dissipation system is a metal buckling-restrained energy dissipation system and comprises an internal energy dissipation steel bar, the upper end and the lower end of the internal energy dissipation steel bar are respectively hinged to the two stressed chain rods, an external high-strength steel pipe is sleeved outside the internal energy dissipation steel bar, a plurality of radial protrusions are machined on the internal energy dissipation steel bar, and the radial protrusions are in contact connection with the inner wall of the external high-strength steel pipe.
6. The composite bridge type self-resetting support device with energy consumption amplification function as claimed in claim 3, wherein the internal energy consumption system is a viscous damping energy consumption system, and comprises a loading steel bar, a piston, damping holes and an outer steel tube, one end of the loading steel bar is hinged to one of the stressed chain rods, one end of the outer steel tube is hinged to the other stressed chain rod, the loading steel bar penetrates into the outer steel tube, the part of the loading steel bar in the outer steel tube is fixedly connected with the piston, the piston is in damping fit with the outer steel tube, and the piston is provided with a plurality of the damping holes.
7. The composite bridge type self-resetting support device with energy dissipation and amplification function as claimed in claim 3, wherein the internal energy dissipation system is a combination of a friction energy dissipation system and a viscous damping energy dissipation system; the friction energy dissipation system is positioned between the two viscous damping energy dissipation systems;
the friction energy dissipation system comprises two friction outer plates and a friction inner plate, the lower end of the friction inner plate is hinged with the stressed chain rod positioned below, the upper ends of the two friction outer plates are hinged with the stressed chain rod positioned above, the upper part of the friction inner plate is clamped between the two friction outer plates, a plurality of vertically arranged slide ways are arranged on the friction outer plates, and pre-tightening bolts penetrate through the slide ways and the friction inner plate;
viscous damping energy dissipation system includes loading rod iron, piston, damping hole and overcoat steel pipe, the one end and one of them of loading rod iron the atress chain pole is articulated, the one end and the other of overcoat steel pipe the atress chain pole is articulated, just the loading rod iron penetrates in the overcoat steel pipe, the loading rod iron is located the intraductal part of overcoat steel with piston fixed connection, just the piston with overcoat steel pipe damping cooperation, the piston has a plurality ofly the damping hole.
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