Fabricated self-resetting steel column base capable of being quickly recovered after earthquake

Abstract

The utility model relates to the field of earthquake resistance of steel structures, and discloses an assembled self-resetting steel column base capable of quickly recovering after an earthquake, which comprises a base and a section steel column arranged on the base, the section steel column comprises a wing plate and a web plate arranged in the middle of the wing plate, a cantilever plate is arranged at the end part of the wing plate of the section steel column, and a damper is arranged on the cantilever plate. The damper is connected with the cantilever plate and the base; a shear plate is arranged at the contact part of the web and the base, special-shaped angle steel is arranged at the contact part of the wing plate and the base, a friction plate is arranged on the side, away from the special-shaped angle steel, of the wing plate, and holes for bolts to insert are formed in the shear plate and the special-shaped angle steel; the damper comprises a cylinder and a first base arranged at the end of the cylinder, a hollow cavity is formed in the cylinder, a spring is arranged at the end, close to the first base, in the cavity, a second base is arranged below the spring and penetrates through the cylinder, and shape memory alloy is arranged in the space between the second base and the inner wall of the cylinder. The steel column base is high in anti-seismic performance, capable of automatically resetting in an earthquake and capable of quickly recovering after the earthquake.

Description

Technical Field

[0001] The utility model relates to the field of earthquake resistance of steel structures, in particular to an assembled self-resetting steel column foot which can be quickly restored after an earthquake. Background Art

[0002] In the past, when strong earthquakes occurred, a large number of steel structures suffered brittle fracture damage, and the steel structure connection points failed to exert their expected energy dissipation capacity and ductility, causing huge losses to the society and economy. If we want to rebuild urban functions after the earthquake, the key lies in the rapid recovery and reuse of building structures after the earthquake. Therefore, studying high-performance recoverable structures and self-resetting structures is an important way to promote the development of prefabricated buildings.

[0003] Unlike traditional frame structures that dissipate energy by plasticizing components during earthquakes, self-resetting structures can dissipate energy during earthquakes through energy-absorbing components, ensuring that the main structure is not damaged or only slightly damaged. The reset components can reduce the residual deformation of the structure after an earthquake. After the earthquake, the structure can be quickly put back into use simply by replacing the energy-absorbing component structure. Due to its good post-earthquake performance, the self-resetting structure has become a very promising earthquake-resistant structural system in recent years.

[0004] The steel column foot is a very important component of the steel frame. Its damage can easily cause the overall collapse of the steel structure. The seismic code puts forward the requirements of "strong columns and weak beams" and "strong nodes and weak components". Therefore, improving the toughness of the column foot node is one of the focuses of seismic research on steel frames. At present, there are some design solutions for self-resetting steel column feet on the market, but most of the research is limited to reducing the residual deformation of the column foot, and lacks the design of rapid repair and replacement of parts after an earthquake.

[0005] Some of the steel column feet in the prior art have the ability to self-reset by applying pre-stress to disc springs. During a strong earthquake, the steel column sways to reduce earthquake damage, and the disc springs are used to self-reset after the earthquake. Although this can reduce the residual deformation of the steel column after the earthquake, the large-scale use of disc springs requires a large pre-stress to be applied to the column foot, which is not conducive to the bearing capacity of the column foot.

[0006] The other steel column foot is composed of an H-shaped steel column, a base, a friction energy dissipation device, a self-reset device and high-strength bolts. The friction energy dissipation device is distributed at the flange and web of the H-shaped steel column. Although this type of steel column foot is easy to install, its prestressed tendons are installed in the center of the column. During the swinging process, the column rotates very little, making it difficult to play its self-reset function. The parts on both sides of the column foot that rotate more will still show obvious plastic failure. Utility Model Content

[0007] In view of the above-mentioned deficiencies in the prior art, the utility model provides an assembled self-resetting steel column base that can quickly recover after an earthquake, which solves the problems in the prior art that a large number of butterfly springs are used in steel columns, which is unfavorable to the bearing capacity of the column base, and that the prestressed tendons are installed in the center of the column, resulting in plastic failure of the parts on both sides of the column base that rotate more.

[0008] In order to achieve the above-mentioned purpose of the utility model, the technical solution adopted by the utility model is: an assembled self-resetting steel column foot that can be quickly restored after an earthquake, including a base and a steel column arranged on the base, the steel column including a wing plate and a web plate arranged in the middle of the wing plate, a cantilever plate is arranged at the end of the wing plate of the steel column, a damper is arranged on the cantilever plate, and the damper connects the cantilever plate and the base; a shear plate is arranged at the contact part between the web plate and the base, a special-shaped angle steel is arranged at the contact part between the wing plate and the base, a friction plate is arranged on the side of the wing plate away from the special-shaped angle steel, and holes for bolts to be inserted are arranged on the shear plate and the special-shaped angle steel;

[0009] The damper includes a column and a first base arranged at the end of the column. A hollow cavity is arranged inside the column. A spring is arranged at one end of the cavity close to the first base. A second base is arranged below the spring. The second base runs through the column. Shape memory alloy is arranged in the space between the second base and the inner wall of the column.

[0010] The beneficial effects of the utility model are as follows: the steel column base adopts a damper that can reduce shock and provide restoring force, an energy-consuming friction plate, and a consumable and replaceable special-shaped angle steel. Under the action of an earthquake, it can consume energy by swinging, and realize self-reset by relying on the restoring force provided by the damper. The consumable parts can be quickly replaced, realizing the self-reset ability of the structure and the function of rapid recovery after an earthquake. The shear plate allows the steel column to swing left and right to consume energy; the damper can provide sufficient restoring force to reduce the residual deformation of the steel column; the combination of the special-shaped angle steel and the friction plate realizes the friction energy consumption of the steel column during the swinging process, and plastic deformation will only appear on the special-shaped angle steel first, and will not cause damage to the column base. The cantilever plates at both ends amplify the displacement caused by the rotation at the column base, which can better play the role of the damper.

[0011] Furthermore, in the above-mentioned assembled self-resetting steel column base that can quickly recover after an earthquake, fixing inserts are arranged on the first base and the second base, grooves are arranged on the fixing inserts, and the first base and the second base are connected to the fixing inserts by bolts.

[0012] The beneficial effect of adopting the above further solution is: after the damper is installed, the groove of the insert is inserted into the first base and the second base, and the insert is fixed with bolts, so that the damper can be fixed.

[0013] Furthermore, in the above-mentioned assembled self-resetting steel column base that can quickly recover after an earthquake, the shear plate includes a bottom plate and two vertical plates arranged on the bottom plate, and a cavity is formed between the two vertical plates for the web plate to be inserted.

[0014] Furthermore, in the above-mentioned assembled self-resetting steel column base that can be quickly restored after an earthquake, the bottom plate and the base of the shear plate are connected by high-strength bolts.

[0015] Furthermore, the diameter of the holes of the assembled self-resetting steel column base that can be quickly restored after an earthquake is 2 mm larger than the diameter of the bolts, and the holes are all elliptical.

[0016] The beneficial effect of adopting the above further solution is that the hole diameter is 2 mm larger than the bolt diameter, ensuring that the bolt can be removed smoothly during post-earthquake maintenance.

[0017] Furthermore, the thickness of the special-shaped angle steel of the above-mentioned assembled self-resetting steel column base that can be quickly restored after an earthquake is 8mm-12mm.

[0018] The beneficial effect of adopting the above further solution is that the thickness of the special-shaped angle steel should not be too large or too small. A thickness between 8mm and 12mm can prevent it from undergoing plastic deformation too early or from undergoing plastic deformation only after the steel column is damaged.

[0019] Furthermore, in the above-mentioned assembled self-resetting steel column base that can quickly recover after an earthquake, the height of the spring and the shape memory alloy is greater than 50 mm.

[0020] The beneficial effect of adopting the above further solution is that the height of the spring and the shape memory alloy is greater than 50 mm, which can provide sufficient space during the swinging of the steel column.

[0021] Furthermore, in the above-mentioned assembled self-resetting steel column base that can quickly recover after an earthquake, the thickness of the shear plate is less than the thickness of the web.

[0022] The beneficial effect of adopting the above further solution is that the thickness of the shear plate is smaller than the thickness of the web, thereby preventing the web from undergoing plastic deformation in advance during an earthquake.

[0023] Furthermore, the friction plate of the assembled self-resetting steel column foot that can quickly recover after an earthquake is a brass friction plate.

[0024] The beneficial effects of adopting the above further solution are: the friction coefficient between brass and steel is relatively large, more energy can be consumed during friction, and the material cost is low.

[0025] The beneficial effects of the utility model are:

[0026] (1) The steel column base is fully assembled. All parts can be prefabricated in the factory and then transported to the site for assembly. It is easy to install, has a short construction period, and can save a lot of labor costs. The production specifications of the parts are unified, and the quality of the finished product is guaranteed. No cement mortar will be used during the construction process, which will not pollute the environment;

[0027] (2) The steel column foot is provided with a cantilever plate at the end of the wing plate of the steel column, and a damper is provided on the cantilever plate, which can buffer energy consumption and prevent plastic deformation of the column foot under earthquake action. At the same time, the restoring force provided by the damper can also enable the column to achieve self-reset. The two ends of the cantilever plate magnify the displacement caused by the rotation of the column foot, which can better play the role of the damper;

[0028] (3) The openings of the connection plate and the special-shaped angle steel are all elliptical, which allows the bolts to slip to a certain extent during the swaying of the column and dissipate energy through friction during this process. Combined with the setting of the friction plate at the flange, the damage to the steel column caused by the earthquake is greatly reduced;

[0029] (4) Through reasonable component arrangement, in rare earthquakes, plastic deformation will first occur on the special-shaped angle steels with relatively small stiffness and relatively easy to wear, thereby protecting the main structure of the steel column from damage, avoiding the risk of the entire structure overturning due to direct damage to the steel column;

[0030] (5) The easily worn special-shaped angle steel and damper can be quickly replaced after the earthquake. This function enables the building structure to be quickly restored and put into use again after the earthquake. During the maintenance and repair of the structure, the safety of the structure will not be affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of an assembled self-resetting column foot;

[0032] Figure 2 It is a schematic diagram of the disassembly and assembly structure of the assembled self-resetting column foot;

[0033] Figure 3 It is a schematic diagram of the disassembly and assembly structure of the damper;

[0034] Figure 4 It is a schematic diagram of the internal structure of the damper;

[0035] Figure 5 It is a structural diagram of the shear plate;

[0036] Figure 6 It is a structural diagram of special-shaped angle steel;

[0037] Among them: 1. base; 2. steel column; 3. cantilever plate; 4. special-shaped angle steel; 5. shear plate; 6. damper; 601. column; 602. spring; 603. shape memory alloy; 604. first base; 605. second base; 7. fixing insert; 8. wing plate; 9. web plate; 10. friction plate; 11. column; 12. groove; 13. bottom plate; 14. vertical plate. DETAILED DESCRIPTION

[0038] The specific implementation methods of the utility model are described below to facilitate technical personnel in this technical field to understand the utility model, but it should be clear that the utility model is not limited to the scope of the specific implementation methods. For ordinary technical personnel in this technical field, as long as various changes are within the spirit and scope of the utility model defined and determined by the attached claims, these changes are obvious, and all utility model creations using the concept of the utility model are protected.

[0039] like Figures 1 to 6 As shown, this embodiment provides an assembled self-resetting steel column base that can be quickly restored after an earthquake, including a base 1 and a steel column 2 arranged on the base 1, the steel column 2 includes a wing plate 8 and a web 9 arranged in the middle of the wing plate 8, a cantilever plate 3 is arranged at the end of the wing plate 8 of the steel column 2, a damper 6 is arranged on the cantilever plate 3, and the damper 6 connects the cantilever plate 3 and the base 1; a shear plate 5 is arranged at the contact portion of the web 9 and the base 1, the shear plate 5 includes a bottom plate 13 and two vertical plates 14 arranged on the bottom plate 13, the middle of the two vertical plates 14 is a cavity for the web 9 to be inserted, and the bottom plate 13 of the shear plate 5 and the base 1 are connected by high-strength bolts.

[0040] A special-shaped angle steel 4 is provided at the contact part between the wing plate 8 and the base 1, and a friction plate 10 is provided on the side of the wing plate 8 away from the special-shaped angle steel 4. The material of the friction plate 10 is brass. The friction coefficient between brass and steel is relatively large, more energy can be consumed during friction, and the material cost is low. Holes for bolt insertion are provided on the shear plate 5 and the special-shaped angle steel 4. The diameter of the hole is 2mm larger than the diameter of the bolt to ensure that the bolt can be removed smoothly during post-earthquake maintenance; the holes are all elliptical, allowing the bolts to slip to a certain extent during the shaking of the column. The thickness of the special-shaped angle steel 4 is 8mm-12mm to prevent it from undergoing plastic deformation too early or after the steel column is damaged. The thickness of the shear plate 5 is less than that of the web 9 to prevent the web 9 from undergoing plastic deformation in advance during an earthquake.

[0041] All parts of the steel column base are prefabricated and punched in the factory, and only the parts need to be assembled on site. The position where the steel column is installed on the base 1 has been pre-punched. First, the shear plate 5 is fixed at the specified position with high-strength bolts, and then the web 9 of the steel column is partially inserted into the cavity of the shear plate 5 so that the bolt holes of the two are aligned. Then, the friction plate 10 and the special-shaped angle steel 4 are placed on both sides of the end of the column base wing plate 8 in turn, and the bolt holes are aligned. The high-strength bolts are inserted and gently tightened to fix each component first, and then check whether there is any misalignment, offset, etc. After confirmation, all bolts are tightened. Finally, align the damper 6 with the opening position of the base 1 and the column base cantilever plate 3, and fix the damper 6. The installation of each component of this patent can be completed using bolts, and the implementation process is simple, rapid and standardized.

[0042] The damper 6 includes a column 601 and a first base 604 disposed at the end of the column 601. A hollow cavity is disposed inside the column 601. A spring 602 is disposed at one end of the cavity close to the first base 604. A second base 605 is disposed below the spring 602. The second base 605 penetrates the column 601. A shape memory alloy 603 is disposed in the space between the second base 605 and the inner wall of the column 601. The height of the spring 602 and the shape memory alloy 603 is greater than 50 mm to provide sufficient space during the swinging of the steel column.

[0043] A fixing insert 7 is disposed on the first base 604 and the second base 605 , a groove 12 is disposed on the fixing insert 7 , and the first base 604 and the second base 605 are connected to the fixing insert 7 by bolts.

[0044] The damper 6 can be adjusted in a certain range of height. When installing, first place the damper 6 body at the opening of the base 1 and the column foot cantilever plate 3, tighten the first base 604 and the second base 605 according to the actual height above and below, and adjust them to be stable within the error of 20mm. Finally, install the fixing insert 7 on the other side and fix it with bolts. The damper 6 can be adjusted within an appropriate deviation and is easy to install and disassemble.

[0045] The principle of the damper 6 is to realize the energy dissipation and shock reduction of the steel column during the earthquake through the internal spring 602 and the shape memory alloy 603, and to provide the steel column with the ability to self-reset through its restoring force, thereby reducing the damage to the main components caused by the earthquake. As a separate and detachable component, the damper 6 is easy to disassemble and assemble, has good versatility, has great market value, can be mass-produced by specialized manufacturers, and can be selected in different heights and different stiffness sizes according to the actual conditions of the project.

[0046] The shear plate 5 and the special-shaped angle steel 4 are connected to the bottom of the steel column by high-strength bolts. After installation, the position of the steel column can be determined and the excessive displacement in the horizontal direction can be limited during the swaying of the steel column. Since the friction generated by the sliding of the bolts needs to be used to consume the energy of the earthquake, when fixing the components with elliptical holes, the high-strength bolts need to be installed in the center of the holes and ensure that each bolt is tightened.

Claims

1. An assembled self-resetting steel column foot that can be quickly restored after an earthquake, characterized in that: The invention comprises a base (1) and a steel column (2) arranged on the base (1), wherein the steel column (2) comprises a wing plate (8) and a web plate (9) arranged in the middle of the wing plate (8), a cantilever plate (3) is arranged at the end of the wing plate (8) of the steel column (2), a damper (6) is arranged on the cantilever plate (3), and the damper (6) connects the cantilever plate (3) and the base (1); a shear plate (5) is arranged at the contact portion between the web plate (9) and the base (1), a special-shaped angle steel (4) is arranged at the contact portion between the wing plate (8) and the base (1), a friction plate (10) is arranged on the side of the wing plate (8) away from the special-shaped angle steel (4), and holes for bolts to be inserted are arranged on the steel column (2), the base (1), the shear plate (5) and the special-shaped angle steel (4); The damper (6) comprises a column (601) and a first base (604) arranged at the end of the column (601); a hollow cavity is arranged inside the column (601); a spring (602) is arranged at one end of the cavity close to the first base (604); a second base (605) is arranged below the spring (602); the second base (605) passes through the column (601); and a shape memory alloy (603) is arranged in the space between the second base (605) and the inner wall of the column (601).

2. The assembled self-resetting steel column foot capable of rapid recovery after an earthquake according to claim 1 is characterized in that: A fixing plug (7) is provided on the first base (604) and the second base (605), a groove (12) is provided on the fixing plug (7), and the first base (604) and the second base (605) are connected to the fixing plug (7) by bolts.

3. The assembled self-resetting steel column foot capable of rapid recovery after an earthquake according to claim 1 is characterized in that: The shear plate (5) comprises a bottom plate (13) and two vertical plates (14) arranged on the bottom plate (13), and a cavity is formed between the two vertical plates (14) into which the web plate (9) can be inserted.

4. The assembled self-resetting steel column foot capable of rapid recovery after an earthquake according to claim 1 is characterized in that: The bottom plate (13) and the base (1) of the shear plate (5) are connected by high-strength bolts.

5. The assembled self-resetting steel column foot capable of rapid recovery after an earthquake according to claim 1 is characterized in that: The diameter of the holes is 2 mm larger than the diameter of the bolts, and the holes are all elliptical.

6. The assembled self-resetting steel column foot capable of rapid recovery after an earthquake according to claim 1 is characterized in that: The thickness of the special-shaped angle steel (4) is 8 mm to 12 mm.

7. The assembled self-resetting steel column foot capable of rapid recovery after an earthquake according to claim 1 is characterized in that: The height of the spring (602) and the shape memory alloy (603) is greater than 50 mm.

8. The assembled self-resetting steel column foot capable of rapid recovery after an earthquake according to claim 1 is characterized in that: The thickness of the shear plate (5) is smaller than the thickness of the web (9).

9. The assembled self-resetting steel column foot capable of rapid recovery after an earthquake according to claim 1 is characterized in that: The friction plate (10) is a brass friction plate (10).

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