Large-diameter circular stand column anti-seismic structure of large-span bridge in earthquake-prone area
By welding the outer circular reinforcement ribs outside the vertical main reinforcement and installing oblong reinforcement stirrups inside, forming tic-tac-shaped composite stirrups, the problem of easy destruction of reinforced concrete circular piers in earthquakes is solved, and the seismic resistance of large-span bridges is improved.
Patent Information
- Application Number
- CN202422480834.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-14
- Publication Date
- 2025-08-15
- Estimated Expiration
- 2034-10-14
AI Technical Summary
The existing reinforced concrete circular pier columns are prone to yield and concrete collapse in vertical main reinforcement during earthquakes, resulting in insufficient seismic performance.
Weld the outer circular reinforcement ribs outside the vertical main reinforcement, and install the oblong reinforcement stirrups inside to form a tic-shaped composite stirrup, which enhances the radial coupling force of the vertical main reinforcement, so that the core concrete changes from one-dimensional pressure to three-dimensional pressure.
The torsion shear strength of large-diameter circular columns of large-span bridges has been improved, the ability to resist bending and shear failure is enhanced, and the seismic effect is improved, and it is especially suitable for pier columns with diameters ≥1.4m.
Smart Images
Figure CN223226474U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of anti-seismic columns, in particular to an anti-seismic structure of large-diameter circular columns for long-span bridges in earthquake-prone areas. Background Art
[0002] In recent years, with the development of society, the development of highways has also been rapid, with bridge spans becoming longer and longer, and pier diameters becoming larger and larger. Reasonable bridge seismic design can minimize driving vibration or earthquake disasters and secondary disasters, saving construction costs. Piers, as the main load-bearing structure of bridges, often suffer bending and shear failures during earthquakes. Currently, reinforced concrete circular piers are a relatively common form of bridge pier structure. Their steel structure is usually equipped with vertical main bars along the length, with circular reinforcement bars installed inside the main bars. The main bars are evenly distributed and welded to the circular reinforcement bars to form a core concrete. However, the damage of this structure in earthquakes is manifested as the vertical main steel bulging and yielding, and the concrete crushing. Summary of the Invention
[0003] In response to the above-mentioned existing technologies, in order to increase the radial connection force of the vertical main reinforcement, change the core concrete from a one-dimensional compressive state to a three-dimensional compressive state, and improve the seismic performance of the pier column, the utility model proposes a seismic-resistant structure of large-diameter circular columns for large-span bridges in earthquake-prone areas.
[0004] The utility model provides an anti-seismic structure of large-diameter circular columns for long-span bridges in earthquake-prone areas, comprising vertical main bars, a plurality of outer circular reinforcing bars welded to the outside of the vertical main bars along the length direction, and a plurality of reinforcing stirrups installed to the inside of the vertical main bars along the length direction.
[0005] Preferably, the outer circular reinforcement ribs are made of Φ25 steel bars.
[0006] Preferably, the spacing between the outer circular reinforcement ribs is 0.1m.
[0007] Preferably, the reinforcing stirrups are cross-shaped composite stirrups formed by pulling two long oval stirrups against each other.
[0008] Preferably, the reinforcing stirrups are made of Φ16 steel bars, the bending angle of the reinforcing stirrups is 135°, and the length of the straight section of the bending hook is not less than 20 cm.
[0009] Preferably, the spacing between the reinforcing stirrups is 0.1m.
[0010] Preferably, the overlap of the outer circular reinforcement ribs is achieved by single-sided welding, with a weld length of 30 cm.
[0011] Compared with the existing technology, the beneficial effects of the present invention are as follows: the present invention proposes a seismic-resistant structure for large-diameter circular columns of long-span bridges in earthquake-prone areas, which can improve the torsional shear strength of the steel mesh composed of vertical main bars, outer circular reinforcement bars, and reinforced stirrups, thereby increasing the seismic performance of large-diameter circular piers of long-span bridges and reducing pier damage. The reinforced stirrups and outer circular reinforcement bars act as a dual restraint on the vertical main bars and core concrete, improving the pier's ability to resist bending and shear failure, and can better enhance the pier's seismic effect. Due to the special production of the circular arc section of the reinforced stirrups, the present invention is more applicable to piers with a diameter of ≥1.4m. BRIEF DESCRIPTION OF THE DRAWINGS
[0012] Figure 1 It is a schematic elevation view of the seismic-resistant structure of large-diameter circular columns of a long-span bridge in earthquake-prone areas according to an embodiment of the present utility model.
[0013] Figure 2 It is a plan view of the seismic-resistant structure of large-diameter circular columns of a long-span bridge in an earthquake-prone area according to an embodiment of the present invention.
[0014] Figure 3 It is a schematic structural diagram of the inner and outer circular reinforcement ribs in an embodiment of the present utility model.
[0015] Figure 4 This is a schematic structural diagram of the oblong stirrups in an embodiment of the present utility model.
[0016] In the figure, 1. Vertical main reinforcement; 2. Outer circular reinforcement; 3. Reinforcement stirrups; 4. Long elliptical stirrups. DETAILED DESCRIPTION
[0017] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific embodiments.
[0018] Example: Figures 1-4 As shown, a seismic-resistant structure for large-diameter circular columns of long-span bridges in earthquake-prone areas includes a vertical main reinforcement 1. Multiple outer circular reinforcement bars 2 are welded to the outside of the vertical main reinforcement 1 along its length. The outer circular reinforcement bars 2 are made of Φ25 steel bars, with a spacing of 0.1m. The overlap is single-sided welded, and the weld length is 30cm. Multiple reinforcing stirrups 3 are installed inside the vertical main reinforcement 1 along its length. The reinforcing stirrups 3 are a crisscross-shaped composite stirrup composed of two long elliptical stirrups 4 pulled together. The reinforcing stirrups 3 are made of Φ16 steel bars, with a spacing of 0.1m, a bend angle of 135°, and a straight bend length of 20cm. The provision of the reinforcing stirrups 3 enhances the radial tension of more than 2 / 3 of the main bars, improving the column's ability to withstand shear failure.
[0019] The method for manufacturing the earthquake-resistant structure comprises the following steps:
[0020] S1. Process the outer circular reinforcement ribs 2 and reinforcement stirrups 3 according to the column diameter in the construction drawing, control the sizes of the outer circular reinforcement ribs 2 and reinforcement stirrups 3, and ensure that the net protective layer thickness of the steel bars is 4 cm.
[0021] S2. Uniformly weld the vertical main reinforcement 1 of the column onto the outer circular reinforcement to form a steel cage. The spacing of the outer circular reinforcement 2 is controlled at 2m. When the number of vertical main reinforcements 1 welded in the four cross-symmetrical directions of the outer circular reinforcement 2 reaches 1 / 6 of the total, stop welding the vertical main reinforcement 1.
[0022] S3. Install half of the processed long oval stirrups 4 on the steel cage in one direction with a spacing of 0.1m;
[0023] S4. Install the remaining half of the processed long oval stirrup 4 on the steel cage perpendicular to the other long oval stirrup 4 in the same plane, with a spacing of 0.1m;
[0024] S5. According to the requirement that the spacing between the outer circular reinforcement bars 2 is 0.1 cm, the outer circular reinforcement bars 2 on the steel cage are increased, the remaining outer circular reinforcement bars 2 are put on the steel cage, and the outer circular reinforcement bars 2 are welded to the steel cage.
[0025] The reinforcing stirrups 3 and the outer circular reinforcing bars 2 of this embodiment play a dual restraining role on the vertical main bars 1 and the core concrete, which can increase the radial connection force of the vertical main bars 1, and change the core concrete from a one-dimensional compressive state to a three-dimensional compressive state, thereby increasing the seismic performance of the pier column.
[0026] The above is only an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent scheme made using the contents of the present invention specification, directly or indirectly used in other related technical fields, is also within the patent protection scope of the present invention.
Claims
1. A large-diameter circular column seismic structure for a long-span bridge in an earthquake-prone area, characterized in that: It comprises a vertical main rib, a plurality of outer circular reinforcing ribs are welded on the outside of the vertical main rib along its length direction, and a plurality of reinforcing stirrups are installed on the inside of the vertical main rib along its length direction.
2. The large-diameter circular column seismic structure for a long-span bridge in an earthquake-prone area according to claim 1, characterized in that: The outer circular reinforcement ribs are made of Φ25 steel bars.
3. The large-diameter circular column seismic structure for long-span bridges in earthquake-prone areas according to claim 1 or 2, characterized in that: The spacing between the outer circular reinforcement ribs is 0.1m.
4. The large-diameter circular column seismic-resistant structure for a long-span bridge in an earthquake-prone area according to claim 1 or 2, characterized in that: The reinforcing stirrups are crisscross-shaped composite stirrups formed by two long oval stirrups in a pulling manner.
5. The large-diameter circular column seismic-resistant structure for a long-span bridge in an earthquake-prone area according to claim 4, characterized in that: The reinforcing stirrups are made of Φ16 steel bars, the bending angle of the reinforcing stirrups is 135°, and the length of the straight section of the bending hook is not less than 20 cm.
6. The large-diameter circular column seismic-resistant structure for a long-span bridge in an earthquake-prone area according to claim 1 or 2, characterized in that: The spacing between the reinforcing stirrups is 0.1m.
7. The large-diameter circular column seismic-resistant structure for a long-span bridge in an earthquake-prone area according to claim 1 or 2, characterized in that: The overlap of the outer circular reinforcement ribs is achieved by single-sided welding, with a weld length of 30 cm.