Damping web member truss bridge with structure and function integrated design

Abstract

The invention provides a structure and function integrated design vibration reduction web member truss bridge which comprises a truss bridge structure composed of an upper chord member, a lower chord member, a web member, an upper parallel connection and a bridge deck system, the two ends of the web member are connected with the upper chord member and the lower chord member respectively, and the web member comprises a straight web member and an inclined web member. The web member at the midspan part adopts a vibration reduction web member, the vibration reduction web member comprises a mass block, a spring, a damper, a sliding rod and an end steel plate, the end steel plate is connected with the upper chord member or the lower chord member, the sliding rod penetrates through the mass block, the two ends of the sliding rod are fixed between the end steel plate, the spring sleeves the outer side of the sliding rod, the spring and one end of the damper are connected with the mass block, and the other end of the damper is connected with the end steel plate. The other end is connected with the end steel plate; the mass block slides between the end steel plates along the sliding rods. According to the truss bridge, the vibration reduction web member with the built-in tuned mass damper is adopted in the midspan position, the vibration reduction effect of the tuned mass damper is achieved while the structural stress requirement is met, and therefore the integrated design of the structure and the function is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of bridges, and in particular to a vibration-damping web-bar truss bridge with integrated structure and function design. Background Art

[0002] Tuned Mass Damper, or TMD, is generally composed of mass blocks, springs, damping modules, connecting steel plates and displacement guide modules. Tuned Mass Damper is widely used in high-rise buildings, bridges, offshore platforms and other large structures subjected to dynamic loads to suppress the vibration of the structure under dynamic loads and improve the safety and comfort of the structure.

[0003] Various new structures and new materials are widely used in current bridge construction, and the design tends to be softer, but this may increase the risk of bridges being affected by vibration during use. The dynamic loads of bridge structures mainly come from crowd loads, vehicle loads, earthquakes and wind loads, so in current bridge designs, whether they are pedestrian bridges, highway bridges or railway bridges, tuned mass dampers have been widely used and developed.

[0004] For steel truss bridges, tuned mass dampers are usually installed at the bottom at mid-span location, e.g. Figure 5 As shown, the vibration response of this position can be effectively controlled, but it requires sufficient space for movement during operation, and will conflict with other facilities during layout. In addition, the mass of the tuned mass damper is usually large, and concentrated installation at the mid-span of the bridge will significantly increase the deadweight of this position, affecting the overall internal force distribution of the bridge. The tuned mass damper directly exposed to the outside will also affect the overall aesthetics of the bridge, and there will be durability issues, which will affect the service life of the tuned mass damper. Summary of the invention

[0005] In order to solve the problems of the prior art, the present invention provides a vibration-damping web truss bridge with an integrated structural and functional design. The truss bridge adopts a vibration-damping web with a built-in tuned mass damper at the mid-span position. While meeting the structural force requirements, the vibration-damping effect of the tuned mass damper is exerted, thereby realizing an integrated structural and functional design.

[0006] The present invention provides a vibration-damping web truss bridge with an integrated structural and functional design, including a truss bridge structure composed of an upper chord, a lower chord, a web, an upper flat link and a bridge deck system, wherein the two ends of the web are respectively connected to the upper chord and the lower chord, and include a straight web and an oblique web. In the truss bridge structure, the web at the mid-span portion adopts a vibration-damping web, which includes a mass block, a spring, a damper, a sliding rod, and an end steel plate, wherein the end steel plate is connected to the upper chord or the lower chord, the sliding rod passes through the mass block and the two ends are fixed between the end steel plates, a spring is sleeved on the outer side of the sliding rod, one end of the spring and the damper are connected to the mass block, and the other end is connected to the end steel plate; the opening diameter of the mass block is larger than the diameter of the sliding rod, and the mass block slides along the sliding rod between the end steel plates.

[0007] The cross-section of the web and the vibration-damping web can be a box-shaped cross-section or a circular cross-section.

[0008] The mass block can adjust the mass and can slide freely along the sliding rod; one end steel plate is fixed at each end of the sliding rod; the damper and the spring are connected to the mass block at one end and connected to the end steel plate at the other end; the spring is sleeved on the sliding rod and can freely extend and retract along the sliding rod; the diameter of the spring is larger than the diameter of the sliding rod, and the spring can freely extend and retract on the sliding rod; the number of the springs is the same as the number of the sliding rods, and the number of the springs and the sliding rods can be adjusted according to the cross-sectional shape of the web.

[0009] As a further improvement of the present invention, the end steel plate in the vibration-damping web is connected to the rod shell, and when the rod wall thickness is small or the mass block is large, the end steel plate can be directly connected to the chord.

[0010] As a further improvement of the present invention, the vibration-damping web members are straight web members in a truss bridge, and the specific arrangement quantity can be selected accordingly according to actual needs. When restricted by the structural form, the vibration-damping web members can also be arranged as diagonal web members.

[0011] As a further improvement of the present invention, the vibration-damping web can be applied to a steel truss bridge or a steel tube concrete truss bridge; the truss bridge can also adopt a simply supported structure or a continuous structure according to actual needs.

[0012] The beneficial effects of the present invention are: (1) The vibration-damping web-member truss bridge of the present invention has an integrated structural and functional design. By having a tuned mass damper built into the web member, the dynamic characteristics of the bridge are changed, the response of the bridge under dynamic loads is reduced, and the comfort and safety of pedestrians or vehicles when passing through the bridge are improved.

[0013] (2) The vibration-damping web-bar truss bridge of the present invention with integrated structural and functional design realizes the built-in tuning mass damper, saves a lot of space, and avoids location conflicts with other facilities.

[0014] (3) Traditional tuned mass dampers are often large concentrated masses, which will cause a large change in the internal force distribution of the bridge structure under static load after installation, thereby affecting the static performance of the bridge structure. The vibration-damping web-bar truss bridge with an integrated structural and functional design of the present invention evenly distributes the concentrated mass of the traditional tuned mass damper in multiple webs, reducing the impact of the additional mass on the bridge and making the overall stress of the structure more reasonable.

[0015] (4) The vibration-damping web-bar truss bridge of the present invention, which has an integrated structural and functional design, makes full use of the larger vertical space in the web. When the bridge generates vertical vibration, the mass block in the tuned mass damper can fully move along the axial direction of the rod, thereby achieving better energy dissipation effect.

[0016] (5) The fatigue performance of the truss structure nodes is directly related to the service life and safety of the bridge. The tuned mass damper of the present invention is installed in the web, which can significantly reduce the fatigue stress amplitude of the nodes adjacent to the web under fatigue loads such as vehicles, thereby improving the fatigue life of the truss nodes.

[0017] (6) The vibration-damping web-bar truss bridge of the present invention has an integrated structural and functional design, in which the tuned mass damper is integrated into the web, thereby avoiding the influence of the tuned mass damper being exposed to the outside on the overall aesthetics of the bridge. In particular, for landscape bridges in cities, the built-in tuned mass damper is more conducive to the aesthetic design of the bridge.

[0018] (7) The tuned mass damper of the present invention is installed in the closed space of the web, and its durability and service life are greatly improved compared with the traditional suspended tuned mass damper. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of a truss bridge according to an embodiment of the present invention.

[0021] Figure 2 It is a schematic diagram of the three-dimensional structure of the vibration-damping belly rod according to an embodiment of the present invention.

[0022] Figure 3This is a schematic diagram of the disassembly of the internal components of the vibration-damping web according to an embodiment of the present invention.

[0023] Figure 4 Schematic diagrams of two working states of the tuned mass damper built into the vibration-absorbing web rod according to an embodiment of the present invention.

[0024] Figure 5 Schematic diagram of the arrangement of traditional tuned mass dampers in a truss bridge.

[0025] Figure 6 Truss bridges without vibration reduction measures and Figure 5 Acceleration comparison of a truss bridge is shown.

[0026] Figure 7 The acceleration comparison chart of a truss bridge without vibration reduction measures and a vibration reduction web truss bridge.

[0027] Marked in the figure are: 1. upper chord; 2. lower chord; 3. straight web; 4. diagonal web; 5. vibration-damping web; 6. upper parallel connection; 7. bridge deck system; 8. mass block; 9. spring; 10. damper; 11. sliding rod; 12. end steel plate; 13. web shell; 14. external tuned mass damper. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] The present invention provides a vibration-damping web-bar truss bridge with integrated structure and function. Figure 1 As shown, it mainly includes an upper chord 1, a lower chord 2, a straight web 3, an inclined web 4, a vibration-damping web 5, an upper horizontal link 6 and a bridge deck system 7. The connection and force transmission methods of each component are the same as those of a traditional truss bridge, the difference being that some straight webs near the mid-span of the bridge are replaced with vibration-damping webs 4, which after replacement, not only serve as structural force-bearing rods, but also play a role in vibration reduction.

[0030] like Figure 2As shown, the vibration-damping web includes a mass block 8, a spring 9, a damper 10, a slide bar 11, an end steel plate 12 and a web shell 13. The mass of the mass block 8 can be adjusted to meet the requirements of different frequencies; the slide bar 11 passes through the end steel plate of the mass block 8 and is fixedly connected to the end steel plates 12 at both ends; the opening of the end steel plate of the mass block 8 is slightly larger than the diameter of the slide bar 11, and the mass block 8 can slide freely along the slide bar 11; one end of the mass block 8 is connected to the end steel plate 12 on this side through the damper 10, and the other end is connected to the other end steel plate 12 through a plurality of springs 9; the spring 9 is sleeved on the outside of the slide bar 11 and can be extended and deformed along the slide bar 11; the disassembly schematic diagram of each component is shown in FIG. Figure 3 shown.

[0031] When the bridge vibrates, the mass block 8 in the vibration-damping web 5 reciprocates under the action of the spring 9, and the damper 10 can play the role of energy consumption. The two position relationships of the mass block 8 in the working state are as follows: Figure 4 shown.

[0032] like Figure 5 The figure shows the arrangement of the conventional tuned mass damper. The external tuned mass damper 14 is installed on the lower chord 2 at the mid-span position of the truss bridge, one is arranged on each side, and the frequency of the tuned mass damper 14 is close to the fundamental frequency of the bridge. In order to compare the vibration reduction effect of the vibration-damping web truss bridge with integrated structure and function design described in the present invention, in the embodiment described in the present invention, the total weight of the mass blocks 8 in all vibration-damping webs 5 is the same as the total weight of the mass unit in the tuned mass damper 14, and the frequency of a single vibration-damping web 5 is close to the fundamental frequency of the bridge.

[0033] right Figure 5 The same sinusoidal dynamic load is applied to the truss bridge with external tuned mass damper and the vibration-damping web truss bridge in this embodiment. The acceleration response at the mid-span of the truss bridge is as follows: Figure 6 and Figure 7 As shown. Without vibration reduction measures, the peak acceleration of the truss bridge at the mid-span is 2.81m / s2, the peak acceleration of the traditional external tuned mass damper truss bridge at the mid-span is 0.34m / s2, and the peak acceleration of the vibration reduction web truss bridge at the mid-span is 0.35m / s2. The peak accelerations of the traditional external tuned mass damper and the vibration reduction web truss bridge are similar. Compared with the truss bridge without vibration reduction measures, the peak accelerations of the two are reduced by 87.9% and 87.5% respectively. However, the vibration reduction web truss bridge disperses the concentrated mass of the tuned mass damper, which can provide more beneficial effects without affecting the vibration reduction performance.

[0034] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device embodiment, the above is only a preferred embodiment of the present invention. Since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field is within the technical scope disclosed by the present invention. For ordinary technicians in the technical field, changes or replacements that can be easily thought of should be covered within the protection scope of the present invention without departing from the principle of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A vibration-damping web truss bridge with integrated structural and functional design, comprising a truss bridge structure consisting of an upper chord, a lower chord, a web, an upper flat link and a bridge deck system, wherein the ends of the web are respectively connected to the upper chord and the lower chord, and include a straight web and an oblique web, and characterized in that: In the truss bridge structure, the web members at the mid-span position adopt vibration-damping web members, which include a mass block, a spring, a damper, a sliding rod, and an end steel plate. The end steel plate is connected to the upper chord or the lower chord. The sliding rod passes through the mass block and both ends are fixed between the end steel plates. A spring is sleeved on the outer side of the sliding rod. One end of the spring and the damper is connected to the mass block, and the other end is connected to the end steel plate. The opening diameter of the mass block is larger than the diameter of the sliding rod, and the mass block slides along the sliding rod between the end steel plates.

2. The vibration-damping web-bar truss bridge with integrated structural and functional design according to claim 1, characterized in that: The diameter of the spring is greater than the diameter of the slide rod, and the spring can be freely extended and retracted on the slide rod; the number of the springs is the same as the number of the slide rods.

3. The vibration-damping web-bar truss bridge with integrated structural and functional design according to claim 1 is characterized in that: The end steel plate is connected to the upper chord or the lower chord through the vibration-damping web member shell.

4. The vibration-damping web-bar truss bridge with integrated structural and functional design according to claim 1 is characterized in that: The cross section of the vibration-damping web is a box-shaped cross section or a circular cross section.

5. The vibration-damping web-bar truss bridge with integrated structural and functional design according to claim 1 is characterized in that: The truss bridge structure is a steel truss bridge or a steel tube concrete truss bridge, and adopts a simply supported structure or a continuous structure.

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