Self-resetting energy dissipation steel column

Abstract

The invention provides a self-resetting energy dissipation steel column which comprises an upper steel column body and a lower steel column body, a bottom plate is fixed to the bottom of the lower steel column body, connecting plates are fixedly installed at the opposite ends of the upper steel column body and the lower steel column body correspondingly, and a friction damper and a resetting element are installed between the pair of connecting plates; the friction damper comprises a pair of upper and lower mounting plates, and the pair of mounting plates are connected with the corresponding connecting plates in a flange manner; the reset element comprises a plurality of PT rods and a spring set. Earthquake energy can be effectively dissipated by arranging the friction damper, and the self-resetting capability can be remarkably improved by introducing the resetting element; the self-resetting steel column with the friction damper can be used in an important building structure in a high-intensity earthquake area, has good energy consumption and self-resetting capacity, avoids damage to a main body structure, reduces residual displacement after an earthquake, guarantees stability of the main body structure, greatly reduces repair cost and repair time after the earthquake, and improves the repair efficiency. The method can be widely applied to the field of various building structures with recoverable functions.

Description

Technical Field

[0001] This invention relates to the field of seismic-resistant structural systems, and in particular to a self-resetting energy-dissipating steel column. Background Technology

[0002] Because earthquakes have a significant impact on buildings, research on effective energy dissipation systems and their design methods has been a major focus in the field of structural engineering. The design philosophy of earthquake engineering has evolved. Structural failure has progressed from controlled ductile failure to low-damage design, and more recently, to near-zero-damage design. In particular, current zero-damage energy dissipation systems show great promise, with friction connections providing excellent energy dissipation while causing minimal damage to the main structure.

[0003] A good sliding friction connection should meet three standards: 1. Under normal use, it is a rigid connection; 2. In strong earthquakes, steel columns are allowed to dissipate energy through frictional sliding between the cap plate and the column; 3. Finally, it can quickly return to the pre-earthquake level at the end of the earthquake, eliminating residual deformation of the building and enabling the building to self-reset.

[0004] Currently, the sliding friction connections used in practice can achieve the first two of these three levels, but not the satisfactory third level. This paper focuses on achieving the third level, which is the most difficult to achieve. Therefore, designing a self-resetting energy-dissipating steel column is of great significance. Summary of the Invention

[0005] To address the above problems, the present invention provides a self-resetting energy-dissipating steel column, which has a strong energy dissipation capacity and a good self-resetting ability.

[0006] To solve the above problems, the technical solution adopted by the present invention is as follows: A self-resetting energy-dissipating steel column includes an upper steel column and a lower steel column. The bottom of the lower steel column is fixed with a base plate for connection to the foundation. A connecting plate is fixedly installed at the opposite ends of the upper steel column and the lower steel column. A friction damper and a reset element are installed between a pair of connecting plates. The friction damper includes a pair of upper and lower mounting plates, which are connected to the corresponding connecting plates by flanges. The upper and lower short steel columns are fixedly mounted on the opposite sides of the pair of mounting plates, and the damper also includes a friction assembly that clamps and surrounds the upper and lower short steel columns. The lower half of the assembly is fixedly mounted on the lower short steel column, and the upper half slides relative to the upper short steel column to generate frictional energy dissipation. The reset element includes multiple PT rods and a spring assembly. The upper and lower ends of the multiple PT rods are elastically mounted on the corresponding connecting plate through the spring assembly to improve the self-resetting capability.

[0007] Preferably, the flange is formed by multiple threaded high-strength bolts, wherein the high-strength bolts are M20 high-strength bolts.

[0008] Preferably, the friction assembly includes an outer flange cover plate, two inner flange cover plates, and a pair of web cover plates. The pair of outer flange cover plates are attached to both sides of the flanges of the upper and lower short steel columns, the two pairs of inner flange cover plates are respectively attached to the inner sides of the flanges of the upper and lower short steel columns, and the pair of web cover plates are attached to both sides of the webs of the upper and lower short steel columns. The outer flange cover plates and the corresponding inner flange cover plates cooperate with each other.

[0009] Preferably, the lower half of an outer flange cover plate and the corresponding inner flange cover plate are connected by multiple second high-strength bolts. The lower short steel column is provided with a standard hole for the second high-strength bolts to pass through. The upper half of an outer flange cover plate and the corresponding inner flange cover plate are connected by multiple third high-strength bolts. The flange of the upper short steel column is opened with a long slot hole for the corresponding third high-strength bolt to pass through. The web of the upper short steel column is opened with a large round hole for the corresponding third high-strength bolt to pass through. The second and third high-strength bolts are M16 high-strength bolts.

[0010] Preferably, brass pads are installed at the joints between the outer flange cover plate, the inner flange cover plate, and the web cover plate and the upper and lower short steel columns.

[0011] Preferably, the large circular hole is a large-sized bolt hole that matches a bolt with a specification two grades higher than that of the first high-strength bolt.

[0012] Preferably, the PT rod is a high-strength anchor rod, which is installed on both sides or around the upper and lower short steel columns.

[0013] Preferably, the spring assembly is one of a disc spring assembly, a spring washer assembly, or a mold spring, and the spring assembly passes through the PT rod and is positioned on the outside of the corresponding connecting plate.

[0014] Preferably, airfoil-shaped stiffening ribs are provided on both sides of the lower end of the flange of the lower steel column and are connected to the base plate.

[0015] Preferably, the cross-sectional dimensions of the upper and lower short steel columns in the friction damper are larger than the cross-sectional dimensions of the upper and lower steel columns.

[0016] The beneficial effects of this invention are as follows: 1. The self-resetting energy-dissipating steel column of this invention possesses strong energy dissipation and self-resetting capabilities. The friction damper can be installed in the factory and transported to the site for connection with the upper and lower steel columns, effectively improving construction efficiency. The elongated slots and large circular holes ensure that the relative sliding between the cover plate and the upper short steel column is not restricted by the hole walls. By applying pre-tightening force to the high-strength bolts, frictional energy dissipation occurs at the contact interface between the cover plate and the upper half of the steel column during an earthquake, thus dissipating seismic energy. The self-resetting capability is significantly improved by installing a reset element.

[0017] 2. Self-resetting steel column with friction damper. The spring assembly and friction damper control the stiffness, bending moment, and rotation angle of the upper and lower steel columns. In this invention, the upper and lower short steel columns within the friction damper employ an enlarged cross-section design. This is to effectively prevent the short steel columns within the friction damper from compressive bending yielding.

[0018] 3. This invention can be used in important building structures in high-intensity earthquake zones. It has good energy dissipation and self-resetting capabilities, avoids damage to the main structure, reduces residual displacement after earthquake, ensures the stability of the main structure, and greatly reduces post-earthquake repair costs and repair time. It can be widely applied in various fields of recoverable functional building structures. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a top view of the present invention; Figure 3 for Figure 2 AA section view in the middle; Figure 4 This is a three-dimensional view of the upper short steel column proposed in this invention.

[0020] In the diagram: 1 Upper steel column, 2 Upper short steel column, 3 Lower short steel column, 4 Lower steel column, 5 PT rod, 6 Outer flange cover plate, 7 Inner flange cover plate, 8 Connecting plate, 9 Mounting plate, 10 Web cover plate, 11 Airfoil stiffening rib, 12 First high-strength bolt, 13 Second high-strength bolt, 14 Spring assembly, 15 Base plate, 16 Brass pad, 17 Third high-strength bolt, 18 Long slot hole, 19 Large round hole. Detailed Implementation

[0021] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0022] Reference Figure 1-4A self-resetting energy-dissipating steel column includes an upper steel column 1 and a lower steel column 4. The bottom of the lower steel column 4 is fixed with a base plate 15. The base plate 15 has reserved holes for connection with the foundation. Connecting plates 8 are fixedly installed at opposite ends of the upper steel column 1 and the lower steel column 4. A friction damper and a reset element are installed between a pair of connecting plates 8.

[0023] The friction damper includes a pair of upper and lower mounting plates 9, which are connected to the corresponding connecting plates 8 by flanges. The upper short steel column 2 and the lower short steel column 3 are fixedly mounted on the opposite surfaces of the pair of mounting plates 9, respectively. It also includes a friction assembly, which clamps and surrounds the upper short steel column 2 and the lower short steel column 3. The lower half is fixedly mounted on the lower short steel column 3, and the upper half slides relative to the upper short steel column 2 to generate frictional energy dissipation.

[0024] Furthermore, the flange is constructed using a multi-threaded connection with 12 high-strength bolts, each of type M20 high-strength bolts. The friction assembly includes an outer flange cover plate 6, two pairs of inner flange cover plates 7, and a pair of web cover plates 10. The outer flange cover plates 6 are attached to both sides of the flanges of the upper short steel column 2 and the lower short steel column 3. The two pairs of inner flange cover plates 7 are respectively attached to the inner sides of the flanges of the upper short steel column 2 and the lower short steel column 3. The pair of web cover plates 10 are attached to both sides of the web of the upper short steel column 2 and the lower short steel column 3. The outer flange cover plate 6 and the corresponding inner flange cover plate 7 are engaged.

[0025] Furthermore, the lower half of an outer flange cover plate 6 and the corresponding inner flange cover plate 7 are connected by multiple second high-strength bolts 13. The lower short steel column 3 is provided with a standard hole for the second high-strength bolts 13 to pass through. The upper half of an outer flange cover plate 6 and the corresponding inner flange cover plate 7 are connected by multiple third high-strength bolts 17. The flange of the upper short steel column 2 is opened with a long slot hole 18 for the corresponding third high-strength bolt 17 to pass through. The web of the upper short steel column 2 is opened with a large round hole 19 for the corresponding third high-strength bolt 17 to pass through. The second high-strength bolt 13 and the third high-strength bolt 17 are M16 high-strength bolts. The large round hole 19 is a large-size bolt hole that matches the bolt with a specification two grades higher than the first high-strength bolt 12. The gap is not less than the distance that the third high-strength bolt 17 slides to one side in the large-size bolt hole, and is not less than 15 mm.

[0026] Furthermore, brass pads 16 are installed at the joints of the outer flange cover plate 6, the inner flange cover plate 7, and the web cover plate 10 with the upper short steel column 2 and the lower short steel column 3 to reduce the frictional resistance between the plates and reduce the wear of the steel columns.

[0027] Furthermore, the cross-sectional dimensions of the upper short steel column 2 and the lower short steel column 3 within the friction damper are larger than those of the upper steel column 1 and the lower steel column 4, which can effectively prevent the steel columns within the action range of the PT rod 5 from prematurely yielding and avoid plastic energy dissipation of the steel columns.

[0028] The reset element includes multiple PT rods 5 and spring assembly 14. The upper and lower ends of the multiple PT rods 5 are elastically mounted on the corresponding connecting plate 8 through the spring assembly 14 to improve the self-resetting capability. The PT rods 5 are high-strength anchor rods, which are installed on both sides or around the upper short steel column 2 and the lower short steel column 3. The spring assembly 14 is one of the following: disc spring assembly, spring washer assembly, or mold spring. The spring assembly 14 passes through the PT rods 5 and is placed on the outside of the corresponding connecting plate 8. By changing the combination method and type of the spring assembly 14, the load-bearing capacity, stiffness, and total deformation of the spring assembly 14 can be changed. When using it, an initial compressive stress of 20%-50% should be applied.

[0029] In addition, airfoil-shaped stiffening ribs 11 are provided on both sides of the lower flange of the lower steel column 4 and connected to the base plate 15 to improve stability.

[0030] This invention relates to a self-resetting energy-dissipating steel column with strong energy dissipation and self-resetting capabilities. The friction damper can be installed in the factory and transported to the site for connection with the upper and lower steel columns, effectively improving construction efficiency. The elongated slot 18 and large circular hole 19 ensure that the relative sliding between the cover plates and the upper short steel column 3 is not restricted by the hole wall. By applying pre-tightening force to the high-strength bolts, frictional energy dissipation occurs at the contact interface between the cover plates and the upper half of the steel column 3 during an earthquake, thus dissipating seismic energy. The self-resetting capability is significantly improved by installing a reset element.

[0031] This invention can be used in important building structures in high-intensity earthquake zones. It has good energy dissipation and self-resetting capabilities, avoids damage to the main structure, reduces residual displacement after earthquake, ensures the stability of the main structure, and greatly reduces post-earthquake repair costs and time. It can be widely applied in various fields of recoverable functional building structures.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A self-resetting energy-dissipating steel column, comprising an upper steel column (1) and a lower steel column (4), characterized in that, The bottom of the lower steel column (4) is fixed with a base plate (15) for connection with the foundation. The upper steel column (1) and the lower steel column (4) are fixedly installed with connecting plates (8) at opposite ends. A friction damper and a reset element are installed between a pair of connecting plates (8). The friction damper includes a pair of upper and lower mounting plates (9), which are connected to the corresponding connecting plates (8) by flanges. The upper short steel column (2) and the lower short steel column (3) are fixedly mounted on the opposite sides of the pair of mounting plates (9). The damper also includes a friction assembly, which clamps and surrounds the upper short steel column (2) and the lower short steel column (3). The lower half is fixedly mounted on the lower short steel column (3), and the upper half slides relative to the upper short steel column (2) to generate frictional energy dissipation. The reset element includes multiple PT rods (5) and a spring assembly (14). The upper and lower ends of the multiple PT rods (5) are elastically mounted on the corresponding connecting plate (8) through the spring assembly (14) to improve the self-reset capability.

2. The self-resetting energy-dissipating steel column according to claim 1, characterized in that, The flange is formed by multiple threaded connections of first high-strength bolts (12), and the first high-strength bolts (12) are M20 high-strength bolts.

3. A self-resetting energy-dissipating steel column according to claim 1, characterized in that, The friction assembly includes an outer flange cover plate (6), two inner flange cover plates (7), and a pair of web cover plates (10). The pair of outer flange cover plates (6) are attached to the flange sides of the upper short steel column (2) and the lower short steel column (3). The two pairs of inner flange cover plates (7) are respectively attached to the inner flange sides of the upper short steel column (2) and the lower short steel column (3). The pair of web cover plates (10) are attached to the web sides of the upper short steel column (2) and the lower short steel column (3). The outer flange cover plate (6) and the corresponding inner flange cover plate (7) cooperate.

4. A self-resetting energy-dissipating steel column according to claim 3, characterized in that, The lower half of an outer flange cover plate (6) and the corresponding inner flange cover plate (7) are connected by multiple second high-strength bolts (13) threaded together. The lower short steel column (3) is provided with a standard hole for the second high-strength bolts (13) to pass through. The upper half of an outer flange cover plate (6) and the corresponding inner flange cover plate (7) are connected by multiple third high-strength bolts (17) threaded together. The flange of the upper short steel column (2) is opened with a long slot hole (18) for the corresponding third high-strength bolt (17) to pass through. The web of the upper short steel column (2) is opened with a large round hole (19) for the corresponding third high-strength bolt (17) to pass through. The second high-strength bolt (13) and the third high-strength bolt (17) are M16 high-strength bolts.

5. A self-resetting energy-dissipating steel column according to claim 4, characterized in that, Brass pads (16) are installed at the joints of the outer flange cover plate (6), inner flange cover plate (7) and web cover plate (10) with the upper short steel column (2) and lower short steel column (3).

6. A self-resetting energy-dissipating steel column according to claim 4, characterized in that, The large circular hole (19) is a large-sized bolt hole that matches a bolt with a specification two grades higher than that of the first high-strength bolt (12).

7. A self-resetting energy-dissipating steel column according to claim 1, characterized in that, The PT rod (5) is a high-strength anchor rod, which is installed on both sides or around the upper short steel column (2) and the lower short steel column (3).

8. A self-resetting energy-dissipating steel column according to claim 1, characterized in that, The spring assembly (14) is one of a disc spring assembly, a spring washer assembly, or a mold spring. The spring assembly (14) passes through the PT rod (5) and is placed on the outside of the corresponding connecting plate (8).

9. A self-resetting energy-dissipating steel column according to claim 1, characterized in that, The lower steel column (4) has airfoil-shaped stiffening ribs (11) on both sides of the lower end of the flange, and is connected to the base plate (15).

10. A self-resetting energy-dissipating steel column according to claim 1, characterized in that, The cross-sectional dimensions of the upper short steel column (2) and the lower short steel column (3) in the friction damper are larger than those of the upper steel column (1) and the lower steel column (4).

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