CN114016372B - Suspension bridge reset energy consumption type central buckle and design and use method thereof - Google Patents
Suspension bridge reset energy consumption type central buckle and design and use method thereof Download PDFInfo
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- CN114016372B CN114016372B CN202111088586.8A CN202111088586A CN114016372B CN 114016372 B CN114016372 B CN 114016372B CN 202111088586 A CN202111088586 A CN 202111088586A CN 114016372 B CN114016372 B CN 114016372B
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Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/02—Suspension bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/16—Suspension cables; Cable clamps for suspension cables ; Pre- or post-stressed cables
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/13—Architectural design, e.g. computer-aided architectural design [CAAD] related to design of buildings, bridges, landscapes, production plants or roads
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G06F2111/10—Numerical modelling
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
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- Pure & Applied Mathematics (AREA)
- Vibration Dampers (AREA)
Abstract
The invention provides a reset energy-consumption type central buckle of a suspension bridge and a design and use method thereof. The device comprises an inner core, a ring spring component, a lead damping component, an inner pipe, a friction plate, an outer pipe, bolts, a sealing ring and a sealing strip. The friction plate is connected in parallel with the lead damping component and then connected in series with the ring spring. The inner core is located the device axis, and the inner core left side end is equipped with the hinge hole, and the inner tube cover is located outside the inner core, and the inner tube right side end is equipped with the hinge hole equally, and both ends hinge hole is used for with external connection. The friction plate is fixed on the inner wall of the outer tube, the outer tube is sleeved outside the inner tube, and bolt holes are uniformly reserved at the positions of the flanges of the outer tube and are used for connecting two semicircular outer tubes. The invention consumes energy simultaneously through the shearing action of the lead damping component and the friction action of the friction plate, and has stable energy consumption performance; the self-resetting function of the device is realized through the ring spring component, so that the residual displacement of the structure is effectively reduced. The invention completes the fixation and connection of the components by the grooves and the bolts, and installs the components in a structure mode of external hinging and serial connection, thereby being convenient for the maintenance of internal components of the device in the later period and the replacement of the damaged components, and having higher economical efficiency.
Description
Technical Field
The invention relates to the technical field of suspension bridges, in particular to a reset energy-consumption type central buckle of a suspension bridge and a design and use method thereof.
Background
And (3) a central buckle: and the components for connecting the main cable and the stiffening beam at the midspan of the suspension bridge are used for improving the integral rigidity of the structure and reducing the relative displacement of the main cable and the stiffening beam.
Ring spring: the ring spring is a compression spring assembled by a plurality of pairs of steel rings with conical surfaces, and is mainly characterized in that the compression spring is assembled between the inner ring and the outer ring, is convenient to assemble, disassemble and replace, only slightly deforms under the action of high load, and has great rigidity. The restoring force can be provided for the structure, the residual displacement of the structure is reduced, and the self-resetting function is realized.
The suspension bridge is a flexible structure, and under the action of train, earthquake and wind load, longitudinal displacement and transverse displacement are generated between the stiffening girder and the main cable, and when the stiffening girder and the main cable are relatively displaced, the sling is bent. To improve this, a central buckle is added to the span region of the suspension bridge. The type of the central buckle commonly used at present mainly comprises a rigid central buckle, a flexible central buckle and an energy-consumption central buckle, wherein the rigid central buckle adopts a rigid triangular truss to connect a main cable and a stiffening girder, and the rigidity of the rigid truss is high, so that the cable girder is relatively fixed in the midspan; the flexible central buckle adopts stay cables to connect the main cable and the stiffening girder so as to complete longitudinal constraint of the cable girder; the energy-consumption type central buckle is usually made of buckling-restrained braces, and the core component of the energy-consumption type central buckle is made of low-yield-point steel, so that the dual functions of constraint limit and energy dissipation and shock absorption can be realized.
The rigid central buckle and the flexible central buckle can improve the rigidity of the bridge and inhibit the relative displacement of the stiffening girder and the main cable, but the stiffening girder and the main cable are easy to damage due to overlarge stress of the rod piece under the strong earthquake action, and the energy-consumption central buckle can solve the problems, but the energy-consumption form is single, and the energy-consumption capacity and the stability still need to be improved. The central buckle has no self-resetting capability, and can not effectively control the residual displacement of the suspension bridge under various loads; and the central buckle is in an integral form, so that after part of the components are damaged, all the components need to be replaced, and waste is easily caused. Therefore, it is of great importance to find a central buckle with a composite energy consumption form and a self-resetting function.
Disclosure of Invention
The embodiment of the invention provides a suspension bridge reset energy consumption type central buckle and a design and use method thereof, which are used for solving the problems of single energy consumption form, limited energy consumption capacity, lack of self-reset function, high replacement difficulty and the like of the current central buckle.
In order to achieve the above purpose, the present invention adopts the following technical scheme.
According to one aspect of the invention, a suspension bridge reset energy consuming center knot comprises: two energy consuming components: friction plate and lead damping member, and a self-resetting functional member: and the friction plate is connected with the lead damping component in parallel and then connected with the ring spring component in series.
Preferably, the suspension bridge reset energy consumption type central buckle further comprises: the novel steel bar device comprises an inner core (1), wherein the inner core (1) is positioned on a central axis of the device, a hinge hole (8) is formed in the tail end of the left side of the inner core (1) and used for connecting the whole device with an external structure, the inner core (1) is a solid round steel bar, and an outer tube limit groove (10), a plurality of lead damping component limit grooves (11) and a ring spring component limit groove (12) are formed in the inner core (1) from left to right and used for placing and restraining corresponding components.
Preferably, the suspension bridge reset energy consumption type central buckle further comprises an inner pipe (2), a hinge hole (9) used for connecting the whole device with the outside is formed in the tail end of the right side of the inner pipe (2), the inner pipe (2) is two semicircular steel pipes, a certain number of grooves are formed in the inner wall, a plurality of lead damping component limiting grooves (11) and a ring spring component limiting groove (12) are formed in the inner wall from left to right in sequence, and the positions of the component grooves are in one-to-one correspondence with the inner core (1).
Preferably, the suspension bridge reset energy consumption type central buckle further comprises: the friction plate (3) is fixed in outer tube (4) inner wall, outer tube (4) cover is located outside inner tube (2), evenly leaves the bolt hole that is used for connecting two semicircle outer tubes (4) in the edge of a wing position of outer tube (4), and this bolt hole adopts bolt (5) to fix, outer tube (4) be two semi-circular steel pipes that end seal and have the edge of a wing, outer tube (4) are fixed with inner core (1) through outer tube spacing recess (10) of inner core (1).
Preferably, the ring spring part comprises a ring spring (13), a ring spring baffle (14) and a limiting ring (15), the ring spring (13) is formed by assembling inner and outer pairs of steel rings with conical surfaces, the inner diameter of the ring is required to be larger than that of the inner core (1) and a proper gap is reserved after the inner ring is compressed, the ring spring (13) penetrates through the inner core (1), the ring spring baffle (14) is made of steel, is in a circular ring shape, the inner diameter of the ring spring is smaller than that of an inner ring of the ring spring (13), the outer diameter of the ring spring is larger than that of an outer ring of the ring spring (13), the two ring spring baffles (14) are respectively arranged at the left end and the right end of the ring spring (13), the centers of the ring spring baffles are aligned, and the limiting ring (15) is welded at the rightmost end of the inner core (1).
Preferably, the lead damping part consists of a plurality of lead blocks (16), and the lead blocks (16) are uniformly fixed in the lead damping part limiting groove (11) of the inner core (1) in an adhesive mode.
Preferably, the friction plate (3) is in a plurality of semicircular sections, the friction plate (3) is fixed on the inner wall of the outer tube (4) in an adhesive mode, the friction plate is uniformly distributed along the inner wall of the outer tube, and the pre-pressure is regulated through the outer tube connecting bolts (5).
Preferably, the sealing ring (6) is made of rubber material and is sleeved at a proper position on the right side of the inner tube (2). The sealing ring (6) is attached to the tail ends of the inner pipe and the outer pipe, so that the relative movement of the inner pipe and the outer pipe when the whole device is pulled is met, the inner structure is completely sealed, the inside of the device is protected, and the anti-corrosion effect is achieved.
Preferably, the sealing strip (7) is made of rubber, is adhered to the inner side of the flange of the outer tube (4), and solves the sealing problem caused by the fact that two semicircular outer tubes are mounted through bolts.
According to another aspect of the invention, there is provided a design and use method of a suspension bridge reset energy consumption type central buckle, comprising:
Prefabricating an inner core (1), an inner pipe (2) and an outer pipe (4), performing shot blasting and rolling on the surfaces of hinge holes at the ends of the inner core and the inner pipe, performing surface quenching and performing surface chemical heat treatment, and prefabricating a connecting piece; prefabricating a ring spring baffle (14) and a limiting ring (15), and coating anti-corrosion and rust-proof paint on the prefabricated parts, wherein an epoxy zinc-rich primer, an epoxy iron cloud intermediate paint and a polyurethane finish paint are adopted for prefabricating a lead damping part and a friction plate part;
The left side ring spring baffle (14) is sleeved in a ring spring part limiting groove (12) reserved in the inner core (1), the ring spring (13) penetrates through the inner core (1), a hydraulic press is adopted to apply pre-compression force to the ring spring part to a design value, the right side ring spring baffle (14) is sleeved in a corresponding groove (12), and a limiting ring (15) is welded at the rightmost end of the inner core (1);
A plurality of lead blocks (16) are stuck in a reserved groove (11) of the inner core, and two semicircular inner pipes (2) are sleeved outside the inner structure, so that the ring spring part and the lead damping part are respectively embedded in the groove;
uniformly gluing and fixing the friction plates on the inner walls of two semicircular outer pipes (4) in a strip form, fixing sealing strips (7) at the flange positions of the outer pipes, sleeving the outer pipes (4) outside the inner pipes (2), ensuring that gaps left between the inner pipes (2) and the outer pipes (4) are in a vertical state, tightly attaching the right ends of the outer pipes (4) to sealing rings (6) sleeved on the inner pipes, fixing the two outer pipes into a whole through bolts (5), and applying pre-pressing force to the friction plates (3);
the whole device is connected with an external structure into a whole through the inner core tail end hinge hole (8) and the inner pipe tail end hinge hole (9).
Preferably, the method further comprises:
(1) Step S1, determining the design axial tension F a, the design displacement delta and the design energy consumption W e of the central buckle according to the internal force, the displacement and the energy consumption requirements of the central buckle under the action of an earthquake;
(2) S2, dividing design energy consumption W e into lead damping component energy consumption W l and friction plate energy consumption W f according to a proportion of alpha and (1-alpha), determining yield bearing capacity F l of the lead damping component and sliding friction force F f of the friction plate, and further determining size and quantity n l of the lead damper, size and precompression F p of the friction plate and quantity n f of the friction plate;
W e＝Wl+Wf (1)
W l＝αWe＝4Fl·Δl (2)
W f＝(1-α)We＝Ff·Δl (3)
F s＞Fl+Ff (4)
F l＝nl·τγ·al·bl (5)
F f＝nf·μs·Fp (8)
Mu s coefficient of sliding friction
Tau γ yield shear stress
G-shear modulus
A-shearing area
Gamma-shear strain
Delta l -design Displacement
(3) S3, unfolding the combined ring spring according to a set principle;
(4) Step S4, determining the total design length as D c＝Dc/nc(nc =1, 2,3 and … … according to the distance D c between the main beam and the main cable connected by the central buckle component;
(5) S5, determining the minimum interval of limiting grooves of the lead damping component according to the principle that the yield load of the lead damper is smaller than the limiting capacity of the limiting grooves, determining the diameter and the number of bolts according to the fact that the axial force of the maximum axial tension F c is smaller than the shearing bearing capacity of the bolts, and determining the width of the flange of the outer tube according to the size of the bolts;
F g＝fy·lg·ag (9)
F g -inner core, inner tube shear bearing capacity
L g -spacing groove spacing of lead damping component
A g width of lead block
F y shear strength of inner core and inner tube
F yb -design value of bolt shear strength
D b diameter of bolt
N b -number of bolts
(6) Step S6, determining a design travel L d according to the maximum displacement requirement of the energy-consumption type reset central buckle, and enabling the design travel L d to be smaller than a reserved gap value E p;
(7) S7, determining the diameter of the inner core, the diameter of the inner tube and the wall thickness according to the principle that the design axial force F in of the inner core and the inner tube is larger than the sum of the lead damping yield force and the design load of the ring spring; determining the diameter and the wall thickness of the outer tube according to the principle that the design axial force F out of the outer tube is larger than the static friction force of the friction plate;
(8) S8, checking the rationality of the design of the device by adopting a theoretical method or a numerical analysis method, and adjusting the components by taking the analysis result as a reference until the design scheme meets various performance requirements;
(9) And S9, processing and assembling the device parts according to the design scheme, and carrying out a pseudo static test and a fatigue performance test according to the requirements to further test the indexes such as the energy consumption capacity, the bearing capacity, the self-resetting capacity, the fatigue performance and the like of the designed central buckle.
Preferably, the expanding design of the ring spring according to the setting principle comprises:
(1) Determining an initial precompression F dp according to the principle that the initial precompression F dp of the ring spring is not less than the sum of the maximum static friction force F sf of the friction plate and the yield force F l of the lead damper;
(2) Determining a ring spring design load F d according to the principle that the sum of the ring spring design load F d, the maximum static friction force F sf of a friction plate and the yield force F l of a lead damper is larger than the design axial tension force F a of a central buckle under the action of an earthquake;
(3) According to the principle that the design displacement delta of the central buckle is smaller than the design displacement delta d of the ring spring, determining the design displacement delta d =a.delta of the ring spring according to a certain safety coefficient;
(4) Determining the specific size of the ring spring according to the design load F d and the design displacement delta d of the ring spring;
(5) And determining the sizes of the ring spring baffle and the limiting ring according to the determined ring spring size.
According to the technical scheme provided by the embodiment of the invention, the suspension bridge reset energy consumption type central buckle adopts the lead damping component to shear energy consumption and friction plate friction energy consumption between the inner pipe and the outer pipe, so that the energy consumption capability of the device can be improved, the self-reset capability is realized through the ring spring component, and the residual displacement of the structure after the action of power load is reduced. Meanwhile, the device has the advantages of universality, low price, simple component manufacture, compact internal space and higher utilization rate. The device has good sealing effect, can avoid the contact between the structure and the outside, and can adapt to severe environments. Install through the externally articulated structural style who establishes ties, and whole device passes through the fixed and the connection of recess and bolt completion part, relies on simple instrument to accomplish device dismantlement and equipment work, the maintenance of the inside component of later stage device and the change after the component damage of being convenient for possess good replaceability and higher economic nature.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is an application schematic diagram of a reset energy-dissipation type central buckle of a suspension bridge according to an embodiment of the present invention;
Fig. 2 is an external schematic view of a reset energy dissipation type central buckle of a suspension bridge according to an embodiment of the present invention, where (a) is an external front view, and (b) is an external top view;
FIG. 3 is a schematic diagram of an internal structure of a reset energy dissipation type center buckle of a suspension bridge according to an embodiment of the present invention, wherein (a) is A-A section, (B) is a B-B section, (C) is a C-C section, (D) is a D-D section, and (E) is an E-E section;
fig. 4 is a schematic diagram of an inner core of a reset energy dissipation type central buckle of a suspension bridge according to an embodiment of the present invention, where (a) is a front view of the inner core, and (b) is a top view of the inner core;
fig. 5 is a schematic view of an inner tube of a reset energy-dissipating center buckle of a suspension bridge according to an embodiment of the present invention, wherein (a) is a front view of the inner tube and (b) is a top view of the inner tube;
fig. 6 is a schematic view of an outer tube of a reset energy dissipation type central buckle of a suspension bridge according to an embodiment of the present invention, where (a) is a front view of the outer tube, and (b) is a top view of the outer tube;
fig. 7 is a schematic view of a shear deformation of a lead block according to an embodiment of the present invention;
FIG. 8 is a schematic view of a ring spring according to an embodiment of the present invention;
fig. 9 is a schematic diagram of lead distribution and a schematic diagram of a fixing bolt according to an embodiment of the present invention;
Fig. 10 is a schematic diagram of a design calculation method of a suspension bridge reset energy-dissipation type central buckle under the action of axial tension according to an embodiment of the present invention;
the reference numerals in the figures illustrate: 1-inner core, 2-inner pipe, 3-friction disc, 4-outer pipe, 5-bolt, 6-sealing ring, 7-sealing strip, 8-inner core hinge hole, 9-inner pipe hinge hole, 10-outer pipe limit groove, 11-lead damping part limit groove, 12-ring spring part limit groove, 13-ring spring, 14-ring spring baffle, 15-limit ring and 16-lead block.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention and are not to be construed as limiting the present invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or coupled. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
For the purpose of facilitating an understanding of the embodiments of the invention, reference will now be made to the drawings of several specific embodiments illustrated in the drawings and in no way should be taken to limit the embodiments of the invention.
According to the embodiment of the invention, the lead damping component is enabled to consume shear energy and the friction plate component is enabled to consume friction energy through relative displacement of the inner pipe and the outer pipe of the structure, and the novel suspension bridge reset energy consumption type central buckle is obtained by combining the self-reset function of the ring spring component. In the structure, the lead damping component and the friction plate are connected in parallel and then connected in series with the ring spring component, and the structural form can lead the lead damping component and the friction plate to be deformed in a coordinated manner, so that the energy consumption is jointly carried out, and the energy consumption capacity of the structure is enhanced. The ring spring component can provide restoring force for the device, so that the device has a resetting function and reduces the influence of residual displacement. The device inner ring spring and the lead damping part are limited by the groove, and the friction plate is fixed on the inner wall of the outer tube in an adhesive mode. The device is wholly fixed by means of outer pipe flange side bolt connection, and can be disassembled and recombined by adopting partial simple equipment, so that the central buckle inner member is convenient to maintain and replace in the later period after being damaged. In addition, the device inner space utilization is high, and the whole leakproofness of structure is better, can adapt to abominable environment, and the whole easy dismantlement of structure is changed, and the maintenance of being convenient for has good economic nature and adaptability.
The embodiment of the invention provides a reset energy-consumption type central buckle of a suspension bridge. The self-resetting friction plate is connected in parallel with the lead damping component and then connected in series with the ring spring.
An application schematic diagram of the suspension bridge reset energy consumption type central buckle in the embodiment of the invention is shown in fig. 1; the external schematic diagram is shown in fig. 2, wherein (a) is an external front view, and (b) is an external top view; the internal structure is schematically shown in FIG. 3, wherein (a) is A-A section, (B) is a B-B section, (C) is a C-C section, (D) is a D-D section, and (E) is an E-E section.
The suspension bridge reset energy consumption type central buckle comprises an inner core (1), a ring spring part, a lead damping part, an inner pipe (2), a friction plate (3), an outer pipe (4), bolts (5), a sealing ring (6) and a sealing strip (7).
Fig. 4 is a schematic diagram of an inner core of a suspension bridge reset energy dissipation center button according to an embodiment, wherein: (a) is a front view of the inner core, and (b) is a top view of the inner core. The inner core (1) is positioned on the central axis of the device, and the tail end of the left side of the inner core (1) is provided with a hinge hole (8). The inner core (1) is a solid round steel bar. The inner core (1) is provided with an outer tube limiting groove (10), a plurality of lead damping component limiting grooves (11) and a ring spring component limiting groove (12) from left to right, and is used for placing and restraining corresponding components, and the left end is provided with a hinge hole (8) for connecting the whole device with an external structure.
Fig. 5 is a schematic view of an inner tube of a reset energy-consuming center buckle of a suspension bridge according to an embodiment of the present invention, wherein: (a) is a front view of the inner tube, and (b) is a top view of the inner tube. The inner tube (2) is sleeved outside the inner core (1), the tail end of the right side of the inner tube (2) is also provided with a hinge hole (9), and the hinge holes at the two ends are used for external connection. The inner tube (2) is two semicircular steel tubes, a certain number of grooves are formed in the inner wall of the inner tube, a plurality of lead damping part limiting grooves (11) and a ring spring part limiting groove (12) are formed in sequence from left to right, the positions of the part grooves correspond to the inner cores one by one, and a hinge hole (9) is formed in the tail end of the right side of the inner tube and used for connecting the whole device with the outside.
Fig. 6 is a schematic view of an outer tube of a suspension bridge reset energy-consuming center buckle according to an embodiment of the present invention, wherein: (a) is a front view of the outer tube, and (b) is a top view of the outer tube. The friction plate (3) is fixed on the inner wall of the outer tube (4), the outer tube (4) is sleeved outside the inner tube (2), and bolt holes are uniformly reserved at the flange positions of the outer tube (4) and are used for connecting the two semicircular outer tubes (4). The outer tube (4) is a semicircular steel tube with two closed ends and flanges. The outer tube is fixed with the inner core (1) through the outer tube limit groove (10) of the inner core, and is used for arranging a certain number of bolt holes at the flange of the steel tube (4), and is fastened by bolts (5), so that the sealing of the whole device and the application of required pre-pressure are ensured, and a precondition is provided for the energy-consuming work of the friction plate (3). And the limit and fixation are carried out by adopting various grooves and bolt connection, so that the replaceability of the structure is improved.
The ring spring component comprises a ring spring (13), a ring spring baffle (14) and a limiting ring (15), wherein the ring spring (13) is formed by assembling inner and outer pairs of steel rings with conical surfaces, the diameter of the inner ring is reduced after being compressed, the inner diameter of the inner ring is required to be larger than that of the inner core (1) and a proper gap is reserved between the inner ring and the inner ring, the ring spring (13) penetrates through the inner core (1), the ring spring baffle (14) is made of steel, the inner diameter of the ring spring is smaller than that of an inner ring of the ring spring (13), the outer diameter of the ring spring is larger than that of an outer ring of the ring spring (13), the two ring spring baffles (14) are respectively arranged at the left end and the right end of the ring spring (13), the centers of the ring spring baffle are aligned, and the limiting ring (15) is welded at the rightmost end of the inner core (1).
The lead damping part consists of a plurality of lead blocks (16), the lead blocks are uniformly fixed in the lead damping part limiting groove (11) of the inner core in an adhesive mode, and the lead damping part is ensured to be positioned at the groove when the inner pipe (2) is installed.
The inner core hinge hole (8) and the inner pipe hinge hole (9) are weak parts of the device, are manufactured by adopting alloy structural steel with good fatigue performance, and adopt a surface strengthening method at the stressed contact surface of the inner core hinge hole (8) and the inner pipe hinge hole (9), so as to improve the fatigue resistance of the device, such as: the connector is subjected to interference fit treatment through surface shot blasting, rolling, quenching and surface chemical heat treatment.
The friction plate (3) is a plurality of semicircular sections, is fixed on the inner wall of the outer tube (4) in a high-temperature-resistant structural adhesive mode, is uniformly distributed along the inner wall of the outer tube, and is regulated by the outer tube connecting bolts (5).
The sealing ring (6) is made of rubber and is adhered to the right end of the outer tube. The sealing ring (6) is attached to the right ends of the inner tube and the outer tube, so that the relative movement of the inner tube and the outer tube when the whole device is pulled is met, the inner structure is completely sealed, the inside of the device is protected, and the anti-corrosion effect is achieved.
The sealing strip (7) is made of rubber, is adhered to the inner side of the flange of the outer tube (4), and enhances the tightness between the two semicircular outer tubes during bolt installation.
The working principle of the suspension bridge reset energy consumption type central buckle provided by the embodiment of the invention comprises the following steps: when the structure drives the central buckle to move in an axial tension way, the inner core (1) and the outer pipe (3) move together with the inner pipe (2) relatively. The relative motion of the inner tube (2) and the inner tube (1) enables the ring spring (13) to be always in a compressed state, continuously provides restoring force for the device, simultaneously enables lead damping components embedded between the inner tube (1) and the inner tube (2) to generate shearing deformation, and respectively generates friction action with the friction plate (3) on the inner wall of the outer tube and the outer wall of the inner tube, and the two energy dissipation functions together, so that the purpose of energy dissipation is achieved.
Fig. 10 is a schematic diagram of a design calculation method of a reset energy-dissipation type central buckle of a suspension bridge under the action of axial tension, and a specific embodiment of the design calculation method includes the following steps:
Selecting proper materials to prefabricate an inner core (1), an inner pipe (2) and an outer pipe (4), performing surface shot blasting and rolling on the surfaces of hinge holes at the ends of the inner core and the inner pipe, performing surface quenching and performing surface chemical heat treatment, and prefabricating a connecting piece. The ring spring baffle (14) and the limiting ring (15) are prefabricated, corrosion-resistant and rust-resistant paint coating is carried out on the prefabricated parts, and an epoxy zinc-rich primer, an epoxy cloud iron intermediate paint and a polyurethane finish paint are adopted for prefabricating the lead damping parts and the friction plate parts.
The left side ring spring baffle (14) is sleeved in a ring spring part limiting groove (12) reserved in the inner core (1), the ring spring (13) penetrates through the inner core (1), a hydraulic press is adopted to apply pre-compression force to the ring spring part to a design value, the right side ring spring baffle (14) is sleeved in a corresponding groove (12), and a limiting ring (15) is welded at the rightmost end of the inner core (1);
A plurality of lead blocks (16) are stuck in the reserved groove (11) of the inner core. Two semicircular inner tubes (2) are sleeved outside the inner structure, so that the ring spring part and the lead damping part are respectively embedded into the grooves.
The friction plate is uniformly glued and fixed on the inner walls of the two semicircular outer tubes (4) in a strip-shaped mode, the sealing strips (7) are fixed at the flange positions of the outer tubes, the outer tubes (4) are sleeved outside the inner tubes (2), the gaps left between the inner tubes (2) and the outer tubes (4) are ensured to be in a vertical state, and the right ends of the outer tubes (4) are tightly attached to the sealing rings (6) sleeved on the inner tubes. The two outer pipes are fixed into a whole through the bolts (5), and simultaneously, the pre-pressure is applied to the friction plate (3) so as to exert the friction energy consumption function.
The whole device is connected with an external structure into a whole through the inner core tail end hinge hole (8) and the inner pipe tail end hinge hole (9).
The design calculation method of the reset energy-consumption type central buckle of the suspension bridge under the action of axial tension comprises the following steps:
(1) Step S1, according to the internal force, displacement and energy consumption requirements of the central buckle under the action of an earthquake, determining the design axial tension F a, the design displacement delta and the design energy consumption W e of the central buckle.
(2) Step S2, FIG. 7 is a schematic diagram of a lead shear deformation according to an embodiment of the present invention. The design energy consumption W e is divided into lead damping component energy consumption W l and friction plate energy consumption W f according to the proportion of alpha and (1-alpha), the yield bearing capacity F l of the lead damping component and the sliding friction force F f of the friction plate are determined, and then the size and the number n l of the lead damper, the size and the pre-compression force F p of the friction plate and the number n f of the friction plate are determined.
W e＝Wl+Wf (1)
W l＝αWe＝4Fl·Δl (2)
W f＝(1-α)We＝Ff·Δl (3)
F s＞Fl+Ff (4)
F l＝nl·τγ·al·bl (5)
F f＝nf·μs·Fp (8)
Mu s coefficient of sliding friction
Tau γ yield shear stress
G-shear modulus
A-shearing area
Gamma-shear strain
Delta l -design Displacement
(3) Step S3, fig. 8 is a schematic diagram of a ring spring structure according to an embodiment of the present invention. The ring spring is unfolded and designed according to the following principle and substeps:
1) Determining an initial precompression F dp according to the principle that the initial precompression F dp of the ring spring is not less than the sum of the maximum static friction force F sf of the friction plate and the yield force F l of the lead damper;
2) Determining a ring spring design load F d according to the principle that the sum of the ring spring design load F d, the maximum static friction force F sf of a friction plate and the yield force F l of a lead damper is larger than the design axial tension force F a of a central buckle under the action of an earthquake;
3) According to the principle that the design displacement delta of the central buckle is smaller than the design displacement delta d of the ring spring, determining the design displacement delta d =a.delta of the ring spring according to a certain safety coefficient;
4) Determining the specific size of the ring spring according to the design load F d and the design displacement delta d of the ring spring;
5) And determining the sizes of the ring spring baffle and the limiting ring according to the determined ring spring size.
(4) Step S4, determining the total design length as D c＝Dc/nc(nc =1, 2,3 … … according to the distance D c between the main beam and the main cable to which the central buckle member is connected.
(5) And S5, determining the minimum interval of the limit grooves of the lead damping component according to the principle that the yield load of the lead damper is smaller than the limit capacity of the limit grooves, determining the diameter and the number of bolts according to the fact that the axial force of the maximum axial tension F c is smaller than the shear bearing capacity of the bolts, and determining the width of the flange of the outer tube according to the size of the bolts.
F g＝fy·lg·ag (9)
F g -inner core, inner tube shear bearing capacity
L g -spacing groove spacing of lead damping component
A g width of lead block
F y shear strength of inner core and inner tube
F yb -design value of bolt shear strength
D b diameter of bolt
N b -number of bolts
(6) Step S6, determining a design travel L d according to the maximum displacement requirement of the energy-consumption type reset central buckle, and enabling the design travel L d to be smaller than a reserved gap value E p.
(7) S7, determining the diameter of the inner core, the diameter of the inner tube and the wall thickness according to the principle that the design axial force F in of the inner core and the inner tube is larger than the sum of the lead damping yield force and the design load of the combined ring spring; the diameter and the wall thickness of the outer tube are determined according to the principle that the design axial force F out of the outer tube is larger than the static friction force of the friction plate.
(8) And S8, checking the rationality of the design of the device by adopting a theoretical method or a numerical analysis method, and adjusting the components by taking the analysis result as a reference until the design scheme meets various performance requirements.
(9) And S9, processing and assembling the device parts according to the design scheme, and carrying out a pseudo static test and a fatigue performance test according to the requirements to further test the indexes such as the energy consumption capacity, the bearing capacity, the self-resetting capacity, the fatigue performance and the like of the designed central buckle.
The reset energy consumption type central buckle of the suspension bridge can be changed according to actual requirements:
(1) The invention adopts the ring spring component to realize the self-resetting function of the whole device, and the specification of the ring spring can be changed according to different requirements. The arrangement position of the ring springs can be that a group of ring spring components are arranged at two ends of the inner core respectively if necessary besides one end of the inner core.
(2) The realization form of the self-resetting function can be changed, the internal structure can be changed simply except for the ring spring, and the self-resetting function of the device is realized by using the components such as the spring, the shape memory alloy, the combined disc spring and the like.
(3) The arrangement number of the lead damping components can be changed according to the implementation requirement, the arrangement form can be uniform, centralized or other along the inner core, lead blocks with different specifications can be adopted, or soft steel or other energy consumption components can be replaced.
(4) The number of friction plates between the inner tube and the outer tube can be changed, the arrangement form can also adopt circumferential dispersion arrangement or centralized arrangement and the like, and the friction plates can be completely glued on the inner wall of the outer tube if necessary. The friction plates made of different materials can be adopted, the number of bolts can be added or reduced, the specification of the bolts can be changed, the pretightening force of the bolts can be adjusted, and the friction plates can be fixed in other modes except cementing.
(5) If necessary, the devices can be connected in series, parallel or the like, so that different energy consumption capacities can be obtained, and the connection mode can be in the forms of hinging, welding or the like according to specific engineering.
(6) The connection between the two ends of the device and the structure can be made by bolts or other forms according to the actual engineering structure.
(7) The anti-corrosion treatment of each part of the device can be carried out by adopting anti-corrosion paint coating or other anti-corrosion treatment according to the anti-corrosion requirements of specific engineering structures.
(8) The central buckle arrangement form can be formed into a unit central buckle in a serial or parallel mode, and the unit central buckle is dependent on the specific engineering requirement.
Above-mentioned suspension bridge resets power consumption formula central knot has following advantage:
(1) When the external structure of the suspension bridge reset energy-consumption type central buckle drives the device to be pulled, the inner core and the inner tube and the outer tube and the inner tube simultaneously perform relative movement, and the lead damping component simultaneously consumes energy through the shearing action and the friction action of the friction plate on the inner surface and the outer surface. Meanwhile, the number and the specification of the friction plates and the lead damping parts can be adjusted through actually required energy consumption capacity, so that the device has strong applicability to different power loads.
(2) And the pre-pressing ring spring part is always kept in a pressed state, so that sufficient restoring force is provided for the device, the device is automatically reset, and the residual deformation of the structure after vibration is reduced.
(3) The invention has good sealing performance of the internal structure, can perform rust prevention and wear prevention treatment on a plurality of parts, can adapt to severe bridge engineering environment, and can stably maintain higher energy consumption capacity for a long time.
(4) The invention is made of common metal materials, has simple section form, most round sections, low manufacturing and processing difficulty and cost and good engineering economic benefit.
(5) The outer tube is connected by bolts, and the components are easy to detach and replace, so that the assembly type production and the later maintenance are facilitated.
(6) The invention can be arranged at the central buckle in a serial connection mode, and can be used for replacing a damaged device, thereby reducing the replacement difficulty and the economic cost.
Those of ordinary skill in the art will appreciate that: the drawing is a schematic diagram of one embodiment and the modules or flows in the drawing are not necessarily required to practice the invention.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for apparatus or system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, with reference to the description of method embodiments in part. The apparatus and system embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (7)
1. The energy-consumption type central buckle for restoring the suspension bridge is characterized by comprising a friction plate component, a lead damping component and an annular spring self-restoring component, wherein the friction plate component is connected with the lead damping component in parallel and then connected with the annular spring self-restoring component in series;
The suspension bridge reset energy consumption type central buckle further comprises: the device comprises an inner core (1), an inner pipe (2) and a friction plate (3), wherein the inner core (1) is positioned on the central axis of the device, a hinge hole (8) is formed in the tail end of the left side of the inner core (1) and is used for connecting the whole device with an external structure, the inner core (1) is a solid round steel rod, an outer pipe limit groove (10), a plurality of lead damping part limit grooves (11) and an annular spring self-resetting part limit groove (12) are formed in the inner core (1) from left to right and are used for placing and restraining corresponding parts;
The right end of the inner tube (2) is provided with a hinge hole (9) for connecting the whole device with the outside, the inner tube (2) is two semicircular steel tubes, the inner wall is provided with a certain number of grooves, a plurality of lead damping part limiting grooves (11) and an annular spring self-resetting part limiting groove (12) are sequentially arranged from left to right, and the positions of the part grooves are in one-to-one correspondence with the inner core (1);
The friction plates (3) are in a plurality of semicircular sections, the friction plates (3) are fixed on the inner wall of the outer tube (4) in an adhesive mode, are uniformly distributed along the inner wall of the outer tube, and the pre-pressure is regulated through the outer tube connecting bolts (5);
The working principle of the suspension bridge reset energy consumption type central buckle comprises the following steps: when the structure drives the central buckle to move along the axial tension, the inner core (1) and the outer pipe (4) move relatively with the inner pipe (2), the inner pipe (2) and the inner core (1) move relatively to enable the ring spring (13) to be always in a compressed state, the restoring force is continuously provided for the device, meanwhile, the lead damping part embedded between the inner core (1) and the inner pipe (2) is enabled to generate shear deformation, the inner wall of the outer pipe and the outer wall of the inner pipe respectively generate friction with the friction plate (3), and the inner pipe and the outer pipe consume energy jointly.
2. The suspension bridge reset energy consuming center button of claim 1, further comprising: the outer tube (4), outer tube (4) cover is located outside inner tube (2), evenly leaves the bolt hole that is used for connecting two semicircle outer tubes (4) in the edge of a wing position of outer tube (4), and this bolt hole adopts bolt (5) to fix, outer tube (4) be two end seal and have the semicircle steel pipe of edge of a wing, outer tube (4) are fixed with inner core (1) through outer tube spacing recess (10) of inner core (1).
3. The suspension bridge reset energy consumption type central buckle according to claim 1, wherein the ring spring self-reset component comprises a ring spring (13), a ring spring baffle plate (14) and a limiting ring (15), the ring spring (13) is formed by assembling inner and outer pairs of steel rings with conical surfaces, the inner diameter of the ring spring is required to be larger than the diameter of an inner core (1) and a proper gap is reserved due to the fact that the diameter of the inner ring is reduced after the inner ring is compressed, the size of the gap depends on the specification of the ring spring, the ring spring (13) penetrates through the inner core (1), the ring spring baffle plate (14) is made of steel, the ring spring is of a ring shape, the inner diameter of the ring spring is smaller than the diameter of an inner ring of the ring spring (13), the outer diameter of the ring spring is larger than the diameter of an outer ring of the ring spring (13), the two ring spring baffle plates (14) are respectively arranged at the left end and the right end of the ring spring (13), the centers are aligned, and the limiting ring (15) is welded at the rightmost end of the inner core (1).
4. The suspension bridge resetting energy-consuming central buckle according to claim 1, wherein the lead damping part consists of a plurality of lead blocks (16), and the lead blocks (16) are uniformly fixed in the lead damping part limiting groove (11) of the inner core (1) in an adhesive mode.
5. The suspension bridge reset energy consuming center button of claim 1, further comprising: sealing washer (6) and sealing strip (7), sealing washer (6) adopt rubber material, overlap it in inner tube (2) right side suitable position, sealing washer (6) and inside and outside pipe terminal laminating, inner tube and outer tube's relative motion when satisfying whole device and drawing, inner structure is sealed completely, and protection device is inside, plays anticorrosive effect, sealing strip (7) adopt rubber material, paste it in outer tube (4) edge of a wing inboard, compensate the sealing problem that two semicircle outer tubes caused when passing through the bolt installation.
6. A method of designing and using a suspension bridge reset energy consuming center button according to any one of claims 1 to 5, comprising:
prefabricating an inner core (1), an inner pipe (2) and an outer pipe (4), performing shot blasting, rolling, quenching and chemical heat treatment on the surfaces of hinge holes at the ends of the inner core and the inner pipe, prefabricating a connecting piece, prefabricating a ring spring baffle (14) and a limiting ring (15), performing corrosion-resistant coating, prefabricating a lead damping part and a friction plate part;
The left side ring spring baffle plate (14) is sleeved into a reserved ring spring self-resetting component limiting groove (12) of the inner core (1), the ring spring (13) passes through the inner core (1), a hydraulic press is adopted to apply pre-compression force to the ring spring (13) to a design value, the right side ring spring baffle plate (14) is sleeved into a corresponding ring spring self-resetting component limiting groove (12), and a limiting ring (15) is welded at the rightmost end of the inner core (1);
A plurality of lead blocks (16) are stuck in a limit groove (11) of a reserved lead damping part of the inner core, and two semicircular inner pipes (2) are sleeved outside the inner structure, so that the annular spring self-resetting part and the lead damping part are respectively embedded in the corresponding limit grooves;
uniformly gluing and fixing the friction plates on the inner walls of two semicircular outer pipes (4) in a strip form, fixing sealing strips (7) at the flange positions of the outer pipes, sleeving the outer pipes (4) outside the inner pipes (2), ensuring that gaps left between the inner pipes (2) and the outer pipes (4) are in a vertical state, tightly attaching the right ends of the outer pipes (4) to sealing rings (6) sleeved on the inner pipes, fixing the two outer pipes into a whole through bolts (5), and applying pre-pressing force to the friction plates (3);
the whole device is connected with an external structure into a whole through the inner core tail end hinge hole (8) and the inner pipe tail end hinge hole (9).
7. The method of designing and using a suspension bridge reset energy consuming center button of claim 6, further comprising:
(1) Step S1, determining the designed axial tension F a and the designed displacement of the central buckle according to the internal force, the displacement and the energy consumption requirements of the central buckle under the action of an earthquake And design power consumption W e;
(2) Step S2, the design energy consumption W e is proportioned And/>The method comprises the steps of dividing the energy consumption W l of a lead damping part and the energy consumption W f of a friction plate, determining the yield bearing capacity F l of the lead damping part and the sliding friction force F f of the friction plate, and further determining the size and the number n l of the lead damper, the size and the pre-pressure F p of the friction plate and the number n f of the friction plate;
(3) Step S3, unfolding and designing the ring spring according to a set principle:
1) Determining an initial precompression F dp according to the principle that the initial precompression F dp of the ring spring is not less than the sum of the maximum static friction force F sf of the friction plate and the yield force F l of the lead damper;
2) Determining a ring spring design load F d according to the principle that the sum of the ring spring design load F d, the maximum static friction force F sf of a friction plate and the yield force F l of a lead damper is larger than the design axial tension force F a of a central buckle under the action of an earthquake;
3) According to the design displacement of the central buckle Less than the design displacement of the ring spring/>Based on the principle of determining the design displacement/>, of the ring spring with a certain safety coefficient；
4) According to the design load F d and the design displacement of the ring springDetermining the specific size of the ring spring;
5) Determining the sizes of the ring spring baffle and the limiting ring according to the determined ring spring size;
(4) Step S4, determining the total design length as D c= Dc/nc (nc =1, 2,3 and … … according to the distance D c between the main beam and the main cable connected by the central buckle component;
(5) S5, determining the minimum interval of limiting grooves of the lead damping component according to the principle that the yield load of the lead damper is smaller than the limiting capacity of the limiting grooves, determining the diameter and the number of bolts according to the fact that the axial force of the maximum axial tension F c is smaller than the shearing bearing capacity of the bolts, and determining the width of the flange of the outer tube according to the size of the bolts;
(6) Step S6, determining a design travel L d according to the maximum displacement requirement of the energy-consumption type reset central buckle, and enabling the design travel L d to be smaller than a reserved gap value E p;
(7) S7, determining the diameter of the inner core according to the principle that the design axial force F in of the inner core and the inner pipe is larger than the sum of the lead damping yield force and the design load of the ring spring; determining the diameter and the wall thickness of the outer tube according to the principle that the design axial force F out of the outer tube is larger than the static friction force of the friction plate;
(8) S8, checking the rationality of the design of the device by adopting a theoretical method or a numerical analysis method, and adjusting the components by taking the analysis result as a reference until the design scheme meets various performance requirements;
(9) Step S9, machining the device parts according to the design scheme and assembling.
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| CN209741644U (en) * | 2018-10-12 | 2019-12-06 | 中交公路长大桥建设国家工程研究中心有限公司 | Multifunctional damper for controlling longitudinal displacement of beam end of long-span cable bridge |
| CN109723160A (en) * | 2019-01-08 | 2019-05-07 | 同济大学 | A kind of Self-resetting component based on high-strength steel cup spring in parallel |
| CN110761431A (en) * | 2019-10-29 | 2020-02-07 | 北京交通大学 | Combined shock-absorbing damper with self-resetting function |
| CN111691286A (en) * | 2020-06-05 | 2020-09-22 | 中交第二公路勘察设计研究院有限公司 | Suspension bridge hinged energy-consuming damping buckle structure |
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