An ultra-long assembled buckling-restrained energy dissipation cross brace for long-span CFST arch bridge

Abstract

The application discloses a kind of super-long assembled buckling-restrained energy dissipation cross brace for large-span CFST arch bridge, belong to bridge seismic technology field, including core component and peripheral constraint component, peripheral constraint component is sleeved in the outside of core component;Core component includes multiple hollow steel pipes, adjacent hollow steel pipes are connected by threaded sleeve, and hollow steel pipe on both ends is equipped with damping telescopic rod, and the end of damping telescopic rod is equipped with lug plate;Peripheral constraint component includes outer constraint cylinder and shuttle-shaped sleeve, outer constraint cylinder is sleeved in the outside of core component, and shuttle-shaped sleeve is sleeved in the outside of outer constraint cylinder.The application forms double restraint effect by increasing shuttle-shaped sleeve outside traditional all-steel type buckling-restrained brace, which can effectively improve overall bending stiffness and restraint performance, thereby improving the overall stability of super-long buckling-restrained brace.

Description

Technical Field

[0001] This invention belongs to the field of bridge seismic technology, and in particular relates to an ultra-long prefabricated buckling-resistant energy-dissipating cross brace for long-span CFST arch bridges. Background Technology

[0002] Long-span steel-concrete composite arch bridges (CFST arch bridges) have become a preferred bridge type for crossing large obstacles such as canyons and rivers due to their advantages of strong span capacity, lightweight structure, and beautiful shape. However, under dynamic forces such as earthquakes and wind loads, the arch ribs of long-span arch bridges are prone to out-of-plane deformation or even instability, requiring lateral bracing to limit the relative displacement of the arch ribs and enhance the overall structural stability. Traditional lateral bracing often uses solid-web steel box girders or truss structures, which, while providing some lateral stiffness, have the following significant shortcomings: First, their self-weight is excessive. The cross braces of long-span arch bridges need to meet ultra-long dimensions (often reaching tens of meters). Traditional steel box girders or trusses, due to their large material usage, cause a surge in the self-weight of the cross braces, not only increasing the burden on the foundation but also potentially affecting the overall structural performance of the arch bridge due to additional internal forces caused by their own weight. Second, their seismic performance is limited. Traditional cross braces primarily rely on rigid force transmission and lack effective energy dissipation mechanisms. Under earthquake action, they are prone to loss of function due to cumulative damage, and post-earthquake repair is difficult and costly. Third, construction and maintenance are inconvenient. Ultra-long cross braces are mostly welded on-site or hoisted as a whole, requiring stringent requirements for construction sites and transportation conditions. Furthermore, if local damage occurs after an earthquake, the entire structure must be replaced, resulting in poor economic efficiency.

[0003] To address the aforementioned issues, buckling-restrained braces (BRBs), due to their combination of high load-bearing capacity and excellent energy dissipation characteristics, are increasingly being applied to bridge lateral force resisting systems. However, conventional buckling-restrained braces are mostly designed with a slenderness ratio. When directly used in long-span arch bridges, they need to be extended to ultra-long dimensions (over 30m in length), which presents new challenges: on the one hand, the increased slenderness ratio of ultra-long braces makes them prone to overall buckling instability, and traditional single-weight restraints (such as those consisting only of an outer steel tube) cannot provide sufficient restraint stiffness; on the other hand, the weight of ultra-long braces increases significantly, greatly increasing the difficulty of transportation and on-site assembly. Furthermore, if the core components are damaged after an earthquake, traditional monolithic structures cannot achieve rapid replacement, resulting in long repair cycles and high costs. In addition, the aesthetic requirements for exposed cross braces are becoming increasingly prominent, and traditional bracing forms are too simplistic to balance mechanical performance and aesthetic appeal.

[0004] In summary, existing cross bracing technology for long-span CFST arch bridges cannot simultaneously meet the requirements of buckling stability, high energy dissipation capacity, lightweight assembly, and post-earthquake replaceability under ultra-long dimensions. There is an urgent need to develop a new type of ultra-long prefabricated buckling-resistant energy dissipation cross bracing to solve the above-mentioned technical bottlenecks. Summary of the Invention

[0005] The purpose of this invention is to provide an ultra-long prefabricated buckling-resistant energy-dissipating cross brace for long-span CFST arch bridges, in order to overcome the shortcomings of the prior art.

[0006] To achieve the above-mentioned objectives, the technical solution adopted by this invention is as follows: An ultra-long prefabricated buckling-restrained energy-dissipating cross brace for long-span CFST arch bridges includes a core component and an outer restraint component, wherein the outer restraint component is fitted onto the outside of the core component. The core component includes multiple hollow steel pipes, adjacent hollow steel pipes are connected by threaded sleeves, and damping telescopic rods are installed on the hollow steel pipes at both ends, with ear plates installed at the ends of the damping telescopic rods. The peripheral constraint component includes an outer constraint cylinder and a spindle-shaped sleeve. The outer constraint cylinder is fitted outside the core component, and the spindle-shaped sleeve is fitted outside the outer constraint cylinder.

[0007] Furthermore, the outer constraint cylinder includes an upper cylinder and a lower cylinder, and the shuttle-shaped sleeve includes an upper shuttle-shaped sleeve and a lower shuttle-shaped sleeve. The upper cylinder is embedded in the upper shuttle-shaped sleeve and fixed by high-strength bolts, and the lower cylinder is embedded in the lower shuttle-shaped sleeve and fixed by high-strength bolts. The upper shuttle-shaped sleeve and the lower shuttle-shaped sleeve are fixed by high-strength bolts.

[0008] Furthermore, the upper shuttle sleeve and the lower shuttle sleeve have the same structure. The upper shuttle sleeve includes a middle section, and the two ends of the middle section are bolted to edge sections. The middle section is semi-cylindrical, and the edge sections are semi-conical.

[0009] Furthermore, the intermediate section includes two symmetrically arranged rectangular base plates and a rectangular rib plate perpendicular to the rectangular base plates. The two rectangular base plates are fixedly connected to the rectangular rib plate by several annular rib plates. A hollowed-out tubular groove is formed between the two rectangular base plates and the several annular rib plates. The upper or lower cylinder is embedded in the tubular groove.

[0010] Furthermore, the edge segment includes two symmetrically arranged trapezoidal base plates and a trapezoidal rib plate perpendicular to the trapezoidal base plates. The two trapezoidal base plates are fixedly connected to the trapezoidal rib plate by several annular rib plates. A hollowed-out tubular groove is formed between the two trapezoidal base plates and the several annular rib plates. The upper cylinder or lower cylinder is embedded in the tubular groove.

[0011] Furthermore, the upper cylinder has the same structure as the lower cylinder. The upper cylinder is a three-section structure, corresponding to the middle section and edge section of the upper shuttle sleeve, and each section has a connecting piece at both ends. The connecting piece has bolt holes for bolting with the upper shuttle sleeve.

[0012] The present invention provides an ultra-long prefabricated buckling-resisting energy-dissipating cross brace for long-span CFST arch bridges, which has the following advantages compared with the prior art: The components are lightweight and compact, with all parts prefabricated in the factory and assembled on-site using threaded sleeves and high-strength bolts. This significantly improves processing, transportation, and installation efficiency. Post-earthquake core inspection and replacement are convenient, and the external restraint components are reusable, greatly reducing maintenance costs. Furthermore, by adding a spindle-shaped sleeve to the outside of the traditional all-steel buckling-restrained brace to create a double restraint effect, the overall bending stiffness and restraint performance can be effectively improved, thereby enhancing the overall stability of the ultra-long buckling-restrained brace. It is foreseeable that the ultra-long prefabricated buckling-restrained energy-dissipating cross brace, with its advantages of ultra-long size, high load-bearing capacity, and lightweight components, can enhance the overall aesthetic appeal and visual effect of the structure when applied to large-span CFST arch bridges as exposed lateral force resisting and energy-dissipating supports. 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 only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure of the core component of the present invention; Figure 3 This is a schematic diagram of the structure of the peripheral constraint component of the present invention; Figure 4 This is a schematic diagram showing the application state of the present invention.

[0015] In the diagram: 1-Hollow steel pipe, 2-Threaded sleeve, 3-Ear plate, 4-Outer constraint cylinder, 5-Spindle-shaped sleeve, 6-Upper cylinder, 7-Lower cylinder, 8-Upper spindle-shaped sleeve, 9-Lower spindle-shaped sleeve, 10-Rectangular base plate, 11-Rectangular rib, 12-Tube groove, 13-Trapezoidal base plate, 14-Trapezoidal rib, 15-Connecting piece. Detailed Implementation

[0016] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments: refer to Figure 1-4As shown, the present invention provides an ultra-long prefabricated buckling-restrained energy-dissipating cross brace for a long-span CFST arch bridge, comprising a core component and an outer restraint component, wherein the outer restraint component is fitted onto the outside of the core component; the core component comprises multiple hollow steel pipes 1, adjacent hollow steel pipes 1 are connected by threaded sleeves 2, and damping telescopic rods are installed on the hollow steel pipes 1 at both ends, wherein ear plates 3 are installed at the ends of the damping telescopic rods; the outer restraint component comprises an outer restraint cylinder 4 and a spindle-shaped sleeve 5, wherein the outer restraint cylinder 4 is fitted onto the outside of the core component, and the spindle-shaped sleeve 5 is fitted onto the outside of the outer restraint cylinder 4. Damping telescopic rods with lugs 3 are installed at both ends of the core component to convert the dynamic input of earthquakes, wind vibrations, etc. into hysteretic energy dissipation of the damper. Through the synergistic effect of the core and the outer constraint components, the cross brace provides lateral stiffness in the elastic stage and dissipates energy through the damper in the elastoplastic stage, avoiding cumulative structural damage. It is significantly better than the seismic performance of traditional rigid force transmission cross brace. Moreover, after the earthquake, only the damaged core component or damper needs to be replaced, and the maintenance cost and cycle are greatly reduced.

[0017] Through the dual constraint design of "core component + peripheral constraint component", the core adopts multiple hollow steel pipes 1 connected by threaded sleeves 2 to form an extendable core force transmission unit. The periphery consists of an outer constraint cylinder 4 and a shuttle-shaped sleeve 5 to form a composite constraint layer. The outer constraint cylinder 4 is embedded in the hollow tubular groove 12 of the shuttle-shaped sleeve 5 and is assembled with high-strength bolts to form a closed constraint space. This can effectively suppress the overall buckling of the ultra-long core component under bending and compression, and overcome the limitation of insufficient constraint stiffness of traditional single constraint in ultra-long supports, ensuring the stable operation of large-span (such as 30m and above) cross braces under complex loads.

[0018] In a preferred embodiment, the outer constraint cylinder 4 includes an upper cylinder 6 and a lower cylinder 7, and the shuttle-shaped sleeve 5 includes an upper shuttle-shaped sleeve 8 and a lower shuttle-shaped sleeve 9. The upper cylinder 6 is embedded in the upper shuttle-shaped sleeve 8 and fixed by high-strength bolts, and the lower cylinder 7 is embedded in the lower shuttle-shaped sleeve 9 and fixed by high-strength bolts. The upper shuttle-shaped sleeve 8 and the lower shuttle-shaped sleeve 9 are fixed together by high-strength bolts.

[0019] The modular core design of "multi-segment hollow steel pipe 1 + threaded sleeve 2" is adopted, combined with the external block assembly structure of "upper / lower cylinder body + upper / lower shuttle sleeve". Each component can be prefabricated in the factory and quickly assembled on site with high-strength bolts, which solves the problems of difficult transportation of ultra-long integral structures and low on-site welding accuracy.

[0020] In a preferred embodiment, the upper shuttle sleeve 8 and the lower shuttle sleeve 9 have the same structure. The upper shuttle sleeve 8 includes a middle section, and the two ends of the middle section are bolted to edge sections. The middle section is semi-cylindrical, and the edge sections are semi-conical.

[0021] In a preferred embodiment, the middle section includes two symmetrically arranged rectangular base plates 10 and a rectangular rib plate 11 perpendicular to the rectangular base plates 10. The two rectangular base plates 10 are fixedly connected to the rectangular rib plate 11 by a number of annular rib plates. A hollowed-out tubular groove 12 is formed between the two rectangular base plates 10 and the number of annular rib plates. The upper cylinder 6 or the lower cylinder 7 is embedded in the tubular groove 12.

[0022] In a preferred embodiment, the edge segment includes two symmetrically arranged trapezoidal base plates 13 and a trapezoidal rib plate 14 perpendicular to the trapezoidal base plates 13. The two trapezoidal base plates 13 are fixedly connected to the trapezoidal rib plate 14 by a number of annular rib plates. A hollowed-out tubular groove 12 is formed between the two trapezoidal base plates 13 and the number of annular rib plates. The upper cylinder 6 or the lower cylinder 7 is embedded in the tubular groove 12.

[0023] The upper / lower shuttle sleeve adopts a combination of a semi-cylindrical middle section and a semi-conical frustum edge section. A hollow tubular groove is formed by rectangular / trapezoidal base plates, ribs and annular ribs, which further reduces weight while ensuring constraint stiffness, and achieves the unity of "lightweight, high load-bearing capacity and easy assembly".

[0024] In a preferred embodiment, the upper cylinder 6 and the lower cylinder 7 have the same structure. The upper cylinder 6 has a three-section structure, corresponding to the middle section and the edge section of the upper shuttle sleeve 8, respectively. Each section has a connecting piece 15 at both ends. The connecting piece 15 has bolt holes for bolting to the upper shuttle sleeve 8.

[0025] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0026] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0027] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. An ultra-long prefabricated buckling-restrained energy-dissipating cross brace for long-span CFST arch bridges, characterized in that, It includes kernel components and peripheral constraint components, with the peripheral constraint components fitted around the kernel components; The core component includes multiple hollow steel pipes (1), adjacent hollow steel pipes (1) are connected by threaded sleeves (2), and damping telescopic rods are installed on the hollow steel pipes (1) at both ends, and ear plates (3) are installed at the ends of the damping telescopic rods. The peripheral constraint component includes an outer constraint cylinder (4) and a shuttle-shaped sleeve (5). The outer constraint cylinder (4) is fitted outside the core component, and the shuttle-shaped sleeve (5) is fitted outside the outer constraint cylinder (4).

2. The ultra-long prefabricated buckling-restrained energy-dissipating cross brace for long-span CFST arch bridges according to claim 1, characterized in that, The outer constraint cylinder (4) includes an upper cylinder (6) and a lower cylinder (7). The shuttle-shaped sleeve (5) includes an upper shuttle-shaped sleeve (8) and a lower shuttle-shaped sleeve (9). The upper cylinder (6) is embedded in the upper shuttle-shaped sleeve (8) and fixed by high-strength bolts. The lower cylinder (7) is embedded in the lower shuttle-shaped sleeve (9) and fixed by high-strength bolts. The upper shuttle-shaped sleeve (8) and the lower shuttle-shaped sleeve (9) are fixed by high-strength bolts.

3. The ultra-long prefabricated buckling-restrained energy-dissipating cross brace for long-span CFST arch bridges according to claim 2, characterized in that, The upper shuttle sleeve (8) and the lower shuttle sleeve (9) have the same structure. The upper shuttle sleeve (8) includes a middle section, and the two ends of the middle section are bolted to edge sections. The middle section is semi-cylindrical, and the edge sections are semi-conical.

4. The ultra-long prefabricated buckling-restrained energy-dissipating cross brace for long-span CFST arch bridges according to claim 3, characterized in that, The middle section includes two symmetrically arranged rectangular base plates (10) and a rectangular rib plate (11) perpendicular to the rectangular base plates (10). The two rectangular base plates (10) are fixedly connected to the rectangular rib plate (11) by several annular rib plates. A hollowed-out tubular groove (12) is formed between the two rectangular base plates (10) and the several annular rib plates. The upper cylinder (6) or the lower cylinder (7) is embedded in the tubular groove (12).

5. The ultra-long prefabricated buckling-restrained energy-dissipating cross brace for long-span CFST arch bridges according to claim 4, characterized in that, The edge segment includes two symmetrically arranged trapezoidal base plates (13) and a trapezoidal rib plate (14) perpendicular to the trapezoidal base plates (13). The two trapezoidal base plates (13) are fixedly connected to the trapezoidal rib plate (14) by several annular rib plates. A hollowed-out tubular groove (12) is formed between the two trapezoidal base plates (13) and the several annular rib plates. The upper cylinder (6) or lower cylinder (7) is embedded in the tubular groove (12).

6. The ultra-long prefabricated buckling-restrained energy-dissipating cross brace for long-span CFST arch bridges according to claim 3, characterized in that, The upper cylinder (6) has the same structure as the lower cylinder (7). The upper cylinder (6) is a three-section structure, corresponding to the middle section and edge section of the upper shuttle sleeve (8) respectively. Each section has a connecting piece (15) at both ends. The connecting piece (15) has bolt holes for bolting to the upper shuttle sleeve (8).

Images