Double-ribbed arch vibration reduction structure with pulley cable damping system

Abstract

This invention relates to the fields of structural engineering and vibration control, and particularly to a double-ribbed arch vibration reduction structure with a pulley-cable damping system. The double-ribbed arch comprises two symmetrically spaced arch ribs extending longitudinally along the bridge or the main axis of the building, with the ends of the two ribs fixedly connected by a cable anchoring structure. A cross brace assembly includes multiple cross braces spaced along the height of the arch ribs to connect the two arch ribs. A pulley assembly is installed on the cross brace nodes connecting the arch ribs and the cross braces, including pulley supports fixed to the arch ribs and pulley bodies mounted on the pulley supports. A cable assembly includes multiple cables positioned between adjacent cross brace nodes and at the cable anchoring structure and adjacent cross brace nodes, forming a staggered connection. A damping assembly includes multiple dampers connected in series with the cables at different locations. The aforementioned double-ribbed arch vibration reduction structure exhibits good vibration reduction performance and strong stability.

Description

Technical Field

[0001] This invention relates to the fields of structural engineering and vibration control, and in particular to a double-ribbed arch vibration reduction structure with a pulley cable damping system. Background Technology

[0002] Arch structures are widely used in bridge and building engineering due to their rational stress distribution and aesthetically pleasing appearance. However, under external dynamic loads (such as wind, earthquakes, vehicle traffic, or explosive impacts), the arch ribs, as the main compression members, exhibit significant vibration responses, easily leading to fatigue accumulation, joint cracking, and loosening of connections. For example, under wind loads, arch structures may experience aerodynamic instability phenomena such as vortex-induced vibration and galloping, resulting in structural fatigue damage, decreased durability, and even safety hazards. Under repeated vehicle loads, the vibration of bridge arch structures is transmitted to the bridge deck, affecting driving comfort and accelerating the aging of components such as arch ribs and hangers. Under earthquakes, the arch structure, as the main load-bearing member, is prone to cracking, buckling, and even irreversible residual deformation due to excessive vibration amplitude, increasing post-earthquake repair costs.

[0003] Traditional arch bridges often reduce vibration by increasing cross-sectional dimensions, improving stiffness, or installing cross bracing. However, these methods tend to increase weight and cost, with limited vibration reduction effects. To address this issue, researchers have attempted to control the vibration of the arch ribs using dampers and prestressed cables. However, existing devices are mostly fixed or partially added, lacking adjustable force transmission paths and failing to flexibly adapt to structural deformation under different working conditions. Furthermore, some solutions are prone to eccentric loading or slippage failure when the force direction on the arch rib changes, making it difficult to guarantee the long-term stability of the structure. Summary of the Invention

[0004] The technical problem to be solved by this invention is to overcome the shortcomings and defects mentioned in the background art above, and to provide a double-ribbed arch vibration reduction structure with a pulley-cable damping system that has good vibration reduction effect and strong stability. The technical solution is as follows: A double-ribbed arch vibration reduction structure with a pulley cable damping system includes: A double-ribbed arch consists of two symmetrically spaced arch ribs that extend along the longitudinal direction of the bridge or the main axis of the building. The ends of the two arch ribs are fixedly connected by the anchoring end of the main arch. A cross bracing assembly includes multiple cross braces spaced apart along the height direction of the arch ribs for connecting two arch ribs. A pulley assembly is installed on the cross brace node on the arch rib and connected to the cross brace; it includes a pulley support fixed on the arch rib and a pulley body set on the pulley support; The cable assembly includes a plurality of cables connected between two arch ribs, with at least one end of each cable disposed on a pulley body; The damping assembly includes multiple dampers connected in series on cables at different locations.

[0005] In one embodiment, the arch rib has a rectangular hollow cross section and is made of high-strength structural steel.

[0006] In one embodiment, the plurality of cross braces are evenly distributed between two arch ribs, and their ends are welded to the arch ribs.

[0007] In one embodiment, the pulley support is a pulley support with bearings, and the pulley support is bolted or welded to the arch rib.

[0008] In one embodiment, the two ends of the cable located in the middle of the arch rib are fixed to the pulley bodies on two horizontally staggered nodes, and one end of the cable located at the end of the arch rib is fixed to the cable anchoring structure at the end of the arch rib, and the other end is fixed to the pulley body of another arch rib.

[0009] In one embodiment, the cable is a high-strength galvanized steel wire rope or a parallel steel wire bundle, and multiple cables are symmetrically and crosswise arranged between two rib arches, with their ends fixed to the lower edge of the arch rib.

[0010] In one embodiment, the damper is disposed on the cable at the mid-span, 1 / 4-span, and 3 / 4-span positions of the double-ribbed structure.

[0011] In one embodiment, the damper is a viscous damper, a friction damper, or a magnetorheological damper.

[0012] Beneficial Effects: Under dead and static loads, the two arch ribs of the aforementioned double-ribbed arch vibration reduction structure with pulley cable damping system primarily bear the vertical and axial pressure, while the cross braces maintain overall stiffness. When subjected to dynamic loads such as earthquakes, wind vibrations, or vehicle impacts, the arch ribs will experience slight lateral or vertical relative vibrations. At this time, the cable system generates controllable slippage through the pulley assembly, causing the dampers to deform accordingly and provide damping force, absorbing some of the vibration energy and thus reducing the vibration amplitude of the arch ribs. Simultaneously, the cables, guided by the pulleys, generate a geometrically nonlinear tensile component. This component acts in the opposite direction at the cross brace node connecting the arch ribs and cross braces during the unloading phase, thereby generating a geometrically self-restoring force. This restoring force originates from the coupling constraint formed by the change in cable length and the rotation of the pulleys, which can cause the arch ribs to automatically return to their original position after energy dissipation, avoiding residual deformation and maintaining long-term structural stability. This double-ribbed arch vibration reduction structure is suitable for bridges, spatial roofs, and other large-span structures, featuring simple structure, convenient construction, and significant vibration reduction effect. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 A three-dimensional structural diagram of a double-ribbed arch vibration reduction structure with a pulley cable damping system as one embodiment; In the diagram: 1: arch rib, 2: cross brace, 3: main arch anchorage end, 4: cable, 5: damper, 6: pulley assembly, 7: cable anchorage end. Detailed Implementation

[0015] To facilitate understanding of the present invention, the present invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of protection of the present invention is not limited to the following specific embodiments.

[0016] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of the invention.

[0017] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this invention can be purchased from the market or prepared by existing methods.

[0018] Please see Figure 1 A double-ribbed arch vibration reduction structure with a pulley and cable damping system according to one embodiment mainly includes: a double-ribbed arch rib 1, a cross brace 2 assembly, a pulley assembly 6, a cable assembly, and a damping assembly. The double-ribbed arch rib 1 includes two arch ribs 1 symmetrically spaced vertically, extending along the longitudinal direction of the bridge or the main axis of the structure, with the ends of the two arch ribs 1 fixedly connected by a main arch anchoring end 3. The cross brace 2 assembly includes multiple cross braces 2 spaced along the height direction of the arch ribs 1, used to connect the two arch ribs 1; the pulley assembly 6 is installed on the cross brace node connecting the arch ribs 1 and the cross braces 2; the pulley assembly 6 includes a pulley support fixed to the arch rib 1 and a pulley body disposed on the pulley support; the cable assembly includes multiple cables 4 connected between the two arch ribs 1, with at least one end of each cable 4 disposed on the pulley body; the damping assembly includes multiple dampers 5 connected in series on the cables 4 at different positions.

[0019] Preferably, in one embodiment, the arch rib 1 has a rectangular hollow section. A rectangular hollow section provides a large moment of inertia and torsional stiffness, effectively resisting bending and torsional deformation of the arch rib 1 under vertical and eccentric loads, making it suitable for bearing the complex internal forces of an arch structure. It is made of high-strength structural steel, such as Q345 or higher grade steel.

[0020] Preferably, in one embodiment, the plurality of cross braces 2 are evenly distributed between the two arch ribs 1, and their ends are welded to the arch ribs 1 to ensure overall rigidity and torsional stability.

[0021] Preferably, in one embodiment, the two ends of the cable 4 located in the middle of the arch rib 1 are fixed to the pulley bodies on the two horizontally staggered nodes, and one end of the cable 4 located at the end of the arch rib 1 is fixed to the cable anchoring end 7 at the end of the arch rib 1, and the other end is fixed to the pulley body of another piece of arch rib 1.

[0022] Preferably, the cables 4 are high-strength galvanized steel wire ropes, with multiple cables 4 symmetrically intersecting between the two rib arches, and their ends fixed to the lower edge of the arch rib 1. This arrangement places the entire system on the path of greatest structural tensile stress and relative displacement change, enabling it to fully respond to structural vibrations caused by external dynamic environments such as wind loads, vehicle loads, and seismic actions, achieving efficient energy dissipation and geometric self-resetting functions. Simultaneously, the lower edge is less affected by environmental factors such as wind, sun, rain, and sudden temperature changes, which is beneficial for the protection and maintenance of the damping device and pulley assembly 6, thereby improving the system's durability, stability, and long-term service performance. Furthermore, the two ends are fixed to the cable 4 anchorage structure, forming a closed force transmission path. The cables 4 connect the staggered cross bracing nodes of the upper and lower arch ribs 1, creating a spatial truss effect, effectively constraining the out-of-plane deformation of the arch ribs 1, and improving the structure's lateral stiffness and torsional resistance. The cable assembly works in conjunction with the cross brace 2 to provide additional constraints for the double-ribbed arch, reducing the risk of instability of the arch rib 1 under load, and is especially suitable for long-span arch bridges or high-rise arch buildings.

[0023] Preferably, in one embodiment, the pulley support is a pulley support with bearings, and the pulley support is bolted or welded to the arch rib 1. The pulley is used to guide the direction of force on the cable 4. The pulley support allows the cable 4 to smoothly change direction, avoids local bending stress, and extends the service life of the cable 4. The cable 4 evenly distributes the load to the arch rib 1 and the cross brace 2, optimizes the distribution of internal forces in the structure, and reduces stress concentration.

[0024] Preferably, in one embodiment, the damping assembly includes dampers 5 disposed on the cables 4 at the mid-span, 1 / 4-span, and 3 / 4-span positions of the double-ribbed structure. These dampers absorb the energy generated by the relative vibration of the arch ribs 1 and achieve multi-point distributed vibration reduction control. The dampers 5 are viscous dampers, friction dampers, or magnetorheological dampers. The dampers 5 dissipate the kinetic energy of the main arch vibration by working in series with the cables 4. When the structure is subjected to external excitation, the arch ribs 1 generate small relative displacements in the lateral and vertical directions. The cables 4 change the direction of force under the guidance of the pulleys and form a nonlinear restoring force. The change in the length of the cables 4 forms a geometric coupling with the pulley rotation angle. After unloading, the reverse force drives the arch ribs 1 to automatically return to their original position, achieving geometric self-resetting. Furthermore, the dampers 5 are connected in series at different positions of the cables 4, which can provide damping for multiple vibration modes and widely suppress vibrations caused by wind, earthquakes, and vehicle loads. When the arch rib 1 undergoes relative displacement, the extension and retraction of the cable 4 drives the damper 5 to work, converting vibration energy into heat energy for dissipation, significantly reducing amplitude and dynamic response. The pulley assembly 6 ensures the free sliding of the cable 4, reducing friction and enabling the damper 5 to respond sensitively to changes in the length of the cable 4, improving energy dissipation efficiency. The pulley assembly 6, cable assembly, and damper 5 can be prefabricated, simplifying on-site assembly and reducing construction difficulty and time. When the damper 5 is damaged or its performance degrades, it can be replaced individually without affecting the main structure, resulting in low maintenance costs.

[0025] The above are merely preferred embodiments of the present invention. It should be noted that the present invention is not limited to the above embodiments. For those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A double-ribbed arch vibration reduction structure with a pulley-cable damping system, characterized in that, include: A double-ribbed arch consists of two symmetrically spaced arch ribs that extend along the longitudinal direction of the bridge or the main axis of the building. The ends of the two arch ribs are fixedly connected by the anchoring end of the main arch. A cross bracing assembly includes multiple cross braces spaced apart along the height direction of the arch ribs for connecting two arch ribs; A pulley assembly is installed on the cross brace node on the arch rib and connected to the cross brace; it includes a pulley support fixed on the arch rib and a pulley body set on the pulley support; The cable assembly includes a plurality of cables connected between two arch ribs, with at least one end of each cable disposed on a pulley body; The damping assembly includes multiple dampers connected in series on cables at different locations.

2. The double-ribbed arch vibration reduction structure with pulley cable damping system according to claim 1, characterized in that, The arch rib has a rectangular hollow cross section and is made of high-strength structural steel.

3. The double-ribbed arch vibration reduction structure with pulley cable damping system according to claim 1, characterized in that, The multiple cross braces are evenly distributed between the two arch ribs, and their ends are welded to the arch ribs.

4. The double-ribbed arch vibration reduction structure with pulley cable damping system according to claim 1, characterized in that, The pulley support is a pulley support with bearings, and the pulley support is bolted or welded to the arch rib.

5. A double-ribbed arch vibration reduction structure with a pulley cable damping system according to claim 1, characterized in that, The two ends of the cable located in the middle of the arch rib are fixed to the pulley body on the two horizontally staggered nodes. One end of the cable located at the end of the arch rib is fixed to the cable anchoring structure at the end of the arch rib, and the other end is fixed to the pulley body on another arch rib.

6. The double-ribbed arch vibration reduction structure with pulley cable damping system according to claim 1, characterized in that, The cables are high-strength galvanized steel wire ropes or parallel steel wire bundles. Multiple cables are symmetrically and cross each other between the two rib arches, and their ends are fixed to the lower edge of the arch ribs.

7. A double-ribbed arch vibration reduction structure with a pulley cable damping system according to claim 1, characterized in that, The dampers are installed on the cables at the mid-span, 1 / 4-span, and 3 / 4-span positions of the double-ribbed structure.

8. A double-ribbed arch vibration reduction structure with a pulley cable damping system according to claim 7, characterized in that, The damper is a viscous damper, a friction damper, or a magnetorheological damper.

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