Damper cross brace combined structure suitable for arch bridge

Abstract

The utility model provides a damper cross brace combined structure suitable for an arch bridge. The damper cross brace combined structure comprises two chord member units arranged between two arch ribs and a torsion damper arranged between the two chord member units, wherein the two ends of the torsion damper are meshed with the two chord member units respectively. Each chord member unit comprises two chord members which are arranged up and down and are parallel to each other, each chord member is provided with a tooth-shaped part, the tooth-shaped parts of the two chord members are oppositely arranged, and outer gear rings at the end parts of the torsion dampers are simultaneously meshed with the tooth-shaped parts of the upper chord member and the lower chord member; one end of the chord member is fixedly connected with one arch rib, and the other end of the chord member is movably connected with the other arch rib; and in the four chord members of the two groups of chord member units, the movable connecting ends of two adjacent chord members in the circumferential direction are arranged in a staggered manner. On one hand, the stability of the arch bridge is improved, on the other hand, the deformation of the torsion metal pipe is ingeniously amplified, and the advantage of large energy consumption of the torsion type metal damper is utilized, so that the safety of the arch bridge is effectively enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of bridges, in particular to a damper cross brace combined structure suitable for arch bridges. Background Art

[0002] my country has a complex and diverse terrain, with a vast mountainous area and crisscrossed by rivers. In order to strengthen economic exchanges among regions and promote common development, a large number of cross-mountain and cross-river bridges have been built. Among them, arch bridges, with their unique structural characteristics and advantages, occupy the majority of the built bridge structure types.

[0003] For arch bridges with larger spans, double arch rib structures are usually used. As the main structure of the arch bridge, the arch rib's own stability and vibration problems should be considered during design. At present, in order to enhance the stability of the arch bridge in the engineering field, cross braces are mainly set between the arch ribs. The cross brace structures mainly include I-shaped, K-shaped and M-shaped. In addition, vibration control measures in the engineering field mainly include passive control, active control, semi-active control and hybrid control. Among them, passive control does not require external energy to provide control force, nor does it require additional monitoring instruments and other equipment. Its device structure is simple, easy to replace, and the technology is relatively mature. In passive control, metal dampers are widely used in the field of structural vibration control and engineering seismic resistance due to their stable hysteresis characteristics, super energy dissipation capacity, and low cost. Under external action, the metal damper undergoes elastic deformation, elastoplastic deformation and plastic deformation in turn. Metal dampers mainly include three types of dampers: bending shear type, tension and compression type, and torsion type. Among them, torsion metal dampers have the advantages of large energy dissipation and stable deformation. In addition, the torsional metal damper itself has a certain rigidity, and it can dissipate energy through plastic deformation.

[0004] Therefore, a damper cross-bracing combination structure suitable for arch bridges is provided. The metal damper and the cross-bracing between the arch ribs are combined and arranged through reasonable design, which can not only improve the stability of the arch bridge but also serve as a reserve of vibration reduction measures for the arch bridge. Utility Model Content

[0005] The utility model aims to provide a damper cross brace combined structure suitable for an arch bridge, aiming to improve the stability of the arch bridge and increase the vibration reduction performance of the arch bridge. The specific technical scheme is as follows:

[0006] A damper cross brace combined structure suitable for an arch bridge, comprising two groups of chord units arranged between two arch ribs and a torsion damper arranged between the two groups of chord units and having two ends respectively meshed with the two groups of chord units;

[0007] The chord unit comprises two chords arranged up and down and parallel to each other, the chord is provided with a toothed portion and the toothed portions of the two chords are arranged opposite to each other, and the outer gear ring at the end of the torsion damper is meshed with the toothed portions of the upper and lower chords at the same time;

[0008] One end of the chord is fixedly connected to one arch rib, and the other end is movably connected to another arch rib; among the four chords of the two groups of chord units, the movably connected ends of two chords adjacent to each other in the circumferential direction are staggered.

[0009] Preferably in the above technical solution, at least two torsional dampers are arranged between the two groups of chord units.

[0010] Preferably in the above technical solution, the torsional damper is a hollow tubular structure, and the outer surfaces of both ends thereof are provided with the outer gear rings.

[0011] Preferably in the above technical solution, the tube wall thicknesses of the torsional dampers are the same or different.

[0012] Preferably, in the above technical solution, the lengths of the torsion dampers are the same or different, on the premise that both ends of the torsion damper are respectively engaged with the two groups of chord units.

[0013] Preferably in the above technical solution, the torsional damper is made of metal.

[0014] Preferably in the above technical solution, one end of the chord is movably connected to the arch rib via a slide groove limiting device, so as to allow only relative movement between the chord and the arch rib along the length direction of the chord.

[0015] Preferably in the above technical solution, the slide groove limiting device includes a connecting ear plate and a connecting pin; between the end of the chord rod and the connecting ear plate, one of them is provided with a type one hole, and the other is provided with a type two hole, and the connecting pin is inserted into the type one hole and the type two hole to connect the connecting ear plate and the chord rod together; the type one hole is a strip hole, and the type two hole is a strip hole or a circular through hole.

[0016] Preferably in the above technical solution, the connecting ear plates are two pieces, both of which are fixedly connected to the arch rib, and the end of the chord is arranged between the two connecting ear plates.

[0017] Preferably in the above technical solution, a limiting portion is provided on the chord rod, and the limiting portion is used to limit the displacement of the torsional damper along its own length direction.

[0018] The application of the technical solution of the utility model has the following beneficial effects:

[0019] The damper cross brace combined structure of the utility model can, on the one hand, enhance the stability of the bridge through the elastic stiffness of the chord unit and the torsion damper, and better ensure the overall safety of the bridge under the action of external loads; on the other hand, the torsion damper consumes external energy through torsional deformation, which plays a vibration reduction role; the staggered setting of the movable connection end of the chord can amplify the deformation difference between the two arch ribs, so as to give full play to the advantage of the large energy consumption of the torsion damper, thereby ensuring the safety and comfort of the bridge. The damper cross brace combined structure has a reasonable structure, excellent mechanical properties, obvious energy consumption advantages, and strong overall structural stability.

[0020] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0022] Figure 1 It is a top view of the damper cross brace combined structure of the utility model;

[0023] Figure 2 When the two arch ribs are far away from each other Figure 1 Sectional view at AA in the middle;

[0024] Figure 3 When the two arch ribs are far away from each other Figure 1 Sectional view at the middle BB;

[0025] Figure 4 is a schematic diagram of the structure of the torsional damper;

[0026] Among them, 1. arch rib, 2. chord rod, 2.1. toothed part, 3. torsion damper, 3.1. outer gear ring, 4. slide groove limiting device, 4.1. connecting ear plate. DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below, and preferred embodiments of the present invention are given. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0029] Example:

[0030] See also Figure 1-Figure 4 , this embodiment provides a damper cross brace combined structure suitable for an arch bridge, comprising two groups of chord units arranged between two arch ribs 1 and a torsion damper 3 arranged between the two groups of chord units and having two ends respectively engaged with the two groups of chord units;

[0031] The chord unit comprises two chords 2 arranged vertically and parallel to each other, the chord 2 is provided with a toothed portion 2.1 and the toothed portions 2.1 of the two chords 2 are arranged opposite to each other, and the outer tooth ring 3.1 at the end of the torsion damper 3 is meshed with the toothed portions 2.1 of the upper and lower chords 2 at the same time; it can be understood that the chord is a rack;

[0032] One end of the chord 2 is fixedly connected to one arch rib 1, and the other end is movably connected to another arch rib 1; among the four chords 2 of the two groups of chord units, the movably connected ends of two chords 2 adjacent to each other in the circumferential direction are staggered.

[0033] Specifically, the movable connection in this embodiment only allows relative movement between the chord 2 and the arch rib 1 along the length direction of the chord 2 .

[0034] like Figure 1-Figure 3 As shown, the circumferentially adjacent here refers to the chords adjacent to a certain chord in the vertical direction, and the chords adjacent to it in the longitudinal direction of the bridge (i.e., the distance direction between the two groups of chord units); specifically, four chords are arranged between two arch ribs 1, and the ends of the four chords at the same end form four corner points of a quadrilateral, wherein two chords in a diagonal relationship are movably connected to the same arch rib, and two chords in the same group of chord units are each movably connected to an arch rib 1. The purpose of such a setting is: Figure 2 As shown in the figure, when the deformation difference between the two arch ribs 1 causes the two arch ribs to be in the horizontal direction (i.e. Figure 2 When there is movement away from each other (in the left and right directions in the figure), the upper chord rod will move to the right along with the arch rib on the right because its movable connection end is on the left and its fixed end is on the right; the lower chord rod will move to the left along with the arch rib on the left because its movable connection end is on the right and its fixed end is on the left, thereby causing the end of the torsion damper between the two chord rods to rotate clockwise; Figure 3 As shown in the figure, when the deformation difference between the two arch ribs 1 causes the two arch ribs to be in the horizontal direction (i.e. Figure 3In the left and right directions (in the horizontal direction), when there is movement away from each other, the upper chord will move to the left along with the arch rib on the left because the movable connection end is on the right and the fixed end is on the left; the lower chord will move to the right along with the arch rib on the right because the movable connection end is on the left and the fixed end is on the right, thereby causing the end of the torsion damper between the two chords to rotate counterclockwise. In this way, torques of different rotation directions can be applied to the two ends of the torsion damper, causing the torsion damper to undergo elastic or plastic deformation to consume external energy and achieve the purpose of vibration reduction. Similarly, when the deformation difference between the two arch ribs 1 causes the two arch ribs to be in the horizontal direction (i.e. Figure 3 When there is movement towards each other (in the left and right directions), torques with different rotation directions will be applied to both ends of the torsional damper, which can also achieve the effect of vibration reduction and energy consumption.

[0035] like Figure 1 As shown, in this embodiment, at least two torsion dampers 3 are arranged between the two groups of chord units, and the purpose of adjusting the stiffness and energy dissipation capacity of the damper cross brace combined structure is achieved by increasing the number of torsion dampers 3.

[0036] Furthermore, the torsion damper 3 in this embodiment is a hollow tubular structure, and the outer surfaces of both ends thereof are provided with the outer gear ring 3.1, and the torsion damper 3 is made of metal. Specifically, the elastic stiffness k of the torsion damper 3 is e and yield deformation θ e The relationship between its construction parameters is as follows:

[0037]

[0038]

[0039] Where L, D out and D in Respectively represent the length, outer diameter and inner diameter of the thin-walled metal tube, G, G*, τ y and γ y They represent the elastic shear modulus, plastic shear modulus, yield shear stress and yield shear strain of the energy dissipation element material respectively.

[0040] It can be seen from the above formula that the elastic stiffness and yield deformation value of the torsional damper are related to its tube wall thickness (i.e., inner diameter and outer diameter) and length. Therefore, in addition to obtaining the stiffness and energy dissipation capacity required by the damper cross brace combination structure by increasing or decreasing the number of torsional dampers, it can also be adjusted by its wall thickness and length. Therefore, the tube wall thickness of each torsional damper 3 can be set to be the same or different; in addition, the length of each torsional damper 3 can be the same or different on the premise that the two ends of the torsional damper 3 are respectively engaged with the two groups of chord units. It should be noted that since the distance between the two groups of chord units is fixed, the length of the torsional damper can only change within a range. When the length of the torsional damper is longer, the engagement length between it and the chord is longer; when the length of the torsional damper is shorter, the engagement length between it and the chord is shorter; that is, the length adjustment of the torsional damper will correspond to the change in the engagement length between it and the chord, and it is necessary to ensure that both ends of the torsional damper can be well engaged with the chord unit.

[0041] Preferably, see Figure 2 and Figure 3 One end of the chord 2 is movably connected to the arch rib 1 through a slide groove limit device 4, so that only relative movement along the length direction of the chord 2 is allowed between the chord 2 and the arch rib 1.

[0042] Specifically, the slide groove limiting device 4 includes a connecting ear plate 4.1 and a connecting pin; between the end of the chord rod 2 and the connecting ear plate 4.1, one is provided with a type-one hole and the other is provided with a type-two hole, and the connecting pin is inserted into the type-one hole and the type-two hole to connect the connecting ear plate 4.1 and the chord rod 2 together; the type-one hole is a strip hole, and the type-two hole is a strip hole or a circular through hole. The connecting ear plate and the chord rod are connected by the connecting pin, and after the connection, the connecting ear plate and the chord rod can be limited from having a large relative movement (i.e., constraining the maximum deformation difference between the two arch ribs); at the same time, when the type-two hole is also a strip hole, the sliding stroke of the sliding connection can be increased, thereby increasing the energy consumption stroke.

[0043] Preferably, the connecting ear plate 4.1 is composed of two pieces, both of which are fixedly connected to the arch rib 1, and the end of the chord 2 is arranged between the two connecting ear plates 4.1, which can improve the connection stability between the chord and the connecting ear plates.

[0044] Preferably, a limiting portion (not shown) is provided on the chord rod 2, and the limiting portion is used to limit the displacement of the torsion damper 3 along its length direction. Specifically, the limiting portion can be a baffle plate provided on the chord rod, or a limiting step provided on the chord rod, so as to constrain the displacement of the torsion damper along its length direction, thereby preventing the torsion damper from falling off.

[0045] The damper cross-bracing combined structure of this embodiment improves the stability of the arch bridge on the one hand, and on the other hand, cleverly amplifies the deformation of the torsion metal tube, utilizing the advantage of the high energy consumption of the torsion metal damper, thereby effectively enhancing the safety of the arch bridge.

[0046] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A damper cross brace combined structure suitable for an arch bridge, characterized in that: It comprises two groups of chord units arranged between two arch ribs (1) and a torsion damper (3) arranged between the two groups of chord units and having two ends respectively meshed with the two groups of chord units; The chord unit comprises two chords (2) arranged in upper and lower positions and parallel to each other, the chord (2) being provided with a toothed portion (2.1) and the toothed portions (2.1) of the two chords (2) being arranged opposite to each other, and the outer tooth ring (3.1) at the end of the torsion damper (3) is meshed with the toothed portions (2.1) of the upper and lower chords (2) at the same time; One end of the chord (2) is fixedly connected to an arch rib (1), and the other end is movably connected to another arch rib (1); among the four chords (2) of the two groups of chord units, the movably connected ends of two chords (2) adjacent in the circumferential direction are staggered.

2. The damper cross brace combined structure suitable for arch bridges according to claim 1, characterized in that: At least two torsion dampers (3) are arranged between the two groups of chord units.

3. The damper cross brace combined structure suitable for arch bridges according to claim 2, characterized in that: The torsion damper (3) is a hollow tubular structure, and the outer surfaces of both ends thereof are provided with the outer gear rings (3.1).

4. The damper cross brace combined structure suitable for arch bridges according to claim 3, characterized in that: The tube wall thicknesses of the torsion dampers (3) are the same or different.

5. The damper cross brace combined structure suitable for arch bridges according to any one of claims 2 to 4, characterized in that: On the premise that both ends of the torsion damper (3) are respectively engaged with the two groups of chord rod units, the lengths of the torsion dampers (3) are the same or different.

6. The damper cross brace combined structure suitable for arch bridges according to claim 1, characterized in that: The torsion damper (3) is made of metal.

7. The damper cross brace combined structure suitable for arch bridges according to claim 1, characterized in that: One end of the chord (2) is movably connected to the arch rib (1) via a slide groove limiting device (4) so ​​as to allow only relative movement along the length direction of the chord (2) between the chord (2) and the arch rib (1).

8. The damper cross brace combined structure suitable for arch bridges according to claim 7, characterized in that: The slide groove limiting device (4) comprises a connecting ear plate (4.1) and a connecting pin; between the end of the chord rod (2) and the connecting ear plate (4.1), one is provided with a first-type hole and the other is provided with a second-type hole; the connecting pin is inserted into the first-type hole and the second-type hole to connect the connecting ear plate (4.1) and the chord rod (2) together; the first-type hole is a strip hole, and the second-type hole is a strip hole or a circular through hole.

9. The damper cross brace combined structure suitable for arch bridges according to claim 8, characterized in that: The connecting ear plates (4.1) are composed of two pieces, both of which are fixedly connected to the arch rib (1), and the end of the chord rod (2) is arranged between the two connecting ear plates (4.1).

10. The damper cross brace combined structure suitable for arch bridges according to claim 1, characterized in that: The chord rod (2) is provided with a limiting portion, and the limiting portion is used to limit the displacement of the torsion damper (3) along its own length direction.

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