Fabricated double-stage energy dissipation and shock absorption column base based on self-resetting damper

Abstract

An assembly type double-stage energy dissipation and shock absorption column base based on self-resetting dampers comprises a bottom plate arranged at the bottom of a concrete filled steel tubular column, angle steel connectors are installed on the two sides of the concrete filled steel tubular column, and the double-stage self-resetting dampers are installed between the bottom ends of the angle steel connectors and the bottom plate; the working mechanism of the double-stage self-resetting damper is divided into two stages, the first stage is a pure energy consumption stage, namely energy consumption between the flat-section cover plate and the first clamping plate is achieved through friction; the second stage is a self-resetting stage, that is, the slope design of the variable cross-section cover plate, the first clamping plate and the second clamping plate and the SMA bolt work cooperatively to achieve the self-resetting effect, the first clamping plate and the second clamping plate move relatively, the slope drives the variable cross-section cover plate to move outwards, the SMA bolt is stretched to be lengthened, and in the unloading process, the SMA bolt has the resetting capacity, so that the self-resetting effect is achieved. The double-stage self-resetting damper is reset without residual deformation; residual deformation of the structure after an earthquake is effectively reduced, the anti-seismic toughness of the structure is improved, and the repair cost of the building after the earthquake is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of building structure energy dissipation and shock absorption, and particularly relates to an assembled two-stage energy dissipation and shock absorption column foot based on a self-resetting damper. BACKGROUND

[0002] At present, the seismic resistance of traditional infrastructure still faces great challenges. Earthquakes cause great damage to the column bottoms of traditional building structures, and the damage to vertical load-bearing components is difficult to repair after an earthquake, so the entire building structure cannot continue to be used, thus causing huge economic losses and high post-earthquake repair costs.

[0003] In order to reduce and avoid damage to the column foot of a building structure, a self-resetting technology is introduced into the column foot of the building structure. This technology mainly uses SMA and steel strands or a self-resetting damper to realize the self-resetting capability of the column foot under the action of an earthquake.

[0004] Nowadays, a self-resetting column foot based on an SMA sliding friction damper has been applied for a utility model patent, namely, "a self-resetting rocking column based on an SMA sliding friction damper" (publication number: CN 116084588 A). However, this rocking column only has a single seismic mode, and earthquakes have uncertainty, so this damper cannot meet the seismic requirements of earthquake uncertainty. However, the current self-resetting technology still has problems such as low initial stiffness of the structure, weak energy dissipation capability, and serious high-order modal response. SUMMARY

[0005] In order to overcome the above-mentioned deficiencies of the prior art, the purpose of the utility model is to provide an assembled two-stage energy dissipation and shock absorption column foot based on a self-resetting damper. By arranging an easily disassembled two-stage self-resetting damper between the bottom of a steel pipe concrete column and a bottom plate, the column foot of the structure can effectively dissipate the input energy of an earthquake when rotating under the action of an earthquake, and has a self-resetting effect under a medium or large earthquake, effectively reducing the residual deformation of the structure after an earthquake, improving the seismic toughness of the structure, and reducing the repair cost of the building after an earthquake.

[0006] In order to achieve the above-mentioned purpose, the technical scheme adopted by the utility model is as follows:

[0007] An assembled two-stage energy dissipation and shock absorption column foot based on a self-resetting damper, comprising a bottom plate 2 arranged at the bottom of a steel pipe concrete column 1, and an angle steel connector 3 installed on both sides of the steel pipe concrete column 1, wherein a two-stage self-resetting damper 8 is arranged between the bottom end of the angle steel connector 3 and the bottom plate 2.

[0008] The double-stage self-resetting damper 8 comprises a first clamping plate 12 and a second clamping plate 13, one end of the first clamping plate 12 and the second clamping plate 13 is a flat section, the other end of the first clamping plate 12 and the second clamping plate 13 is a variable section, the upper and lower surfaces of the flat section end of the first clamping plate 12 are symmetrically connected with one end of the flat section cover plate 10, the upper and lower surfaces of the variable section end of the first clamping plate 12 are symmetrically connected with one end of the variable section cover plate 11, the upper and lower surfaces of the variable section end of the second clamping plate 13 are symmetrically connected with the other end of the variable section cover plate 11, the other end of the flat section cover plate 10 which is not connected with the first clamping plate 12 is connected with the first connecting plate 141, the upper and lower surfaces of the flat section end of the second clamping plate 13 are symmetrically connected with the second connecting plate 142 and the third connecting plate 143, the first connecting plate 141 is hinged with the bottom of the angle steel connector 3, and the second connecting plate 142 and the third connecting plate 143 are both hinged with the bottom plate 2.

[0009] The angle steel connector 3 is fixed on both sides of the concrete-filled steel tubular column 1 through the core penetrating bolt 4.

[0010] The lateral plates 6 are connected on both sides of the bottom side plate 2 of the concrete-filled steel tubular column 1 which is not installed with the double-stage self-resetting damper 8 through the bolt 7.

[0011] The flat section cover plate 10 is connected with the flat section end of the first clamping plate 12 through the first high-strength bolt 151, and the variable section ends of the first clamping plate 12 and the second clamping plate 13 are respectively connected with the variable section cover plates 11 on the upper and lower surfaces through the SMA bolts 16.

[0012] The SMA bolts 16 and the contact surfaces of the variable section cover plates 11 are provided with the gasket 17.

[0013] The other end of the flat section cover plate 10 which is not connected with the first clamping plate 12 is connected with the first connecting plate 141 through the second high-strength bolt 152, and the flat section end of the second clamping plate 13 is connected with the second connecting plate 142 and the third connecting plate 143 through the third high-strength bolt 153.

[0014] Both sides of the variable section end of the first clamping plate 12 and the second clamping plate 13 are provided with two first inclined variable sections 121, the two first inclined variable sections 121 are in a concave structure, the connection surfaces of the variable section cover plates 11 and the first clamping plate 12 and the second clamping plate 13 are respectively provided with two second inclined variable sections 111, the two second inclined variable sections 111 are in a convex structure, and the concave structure and the convex structure are fitted.

[0015] The frictional sliding force between the flat section cover plate 10 and the flat section end of the first clamping plate 12 is smaller than the frictional sliding force between the variable section cover plate 11 and the variable section end of the first clamping plate 12 and the second clamping plate 13.

[0016] The top of the concrete-filled steel tubular column 1 is provided with the cover plate 5.

[0017] The rib plate 9 is fixed in the angle steel connector 3.

[0018] Compared with the prior art, the utility model has the advantages of:

[0019] 1、The utility model discloses a two-stage energy dissipation and shock reduction column foot based on a self-resetting damper, in the whole deformation process, the whole component is in an elastic working state, and input energy in the earthquake is dissipated by the two-stage self-resetting damper, which dissipates energy by adopting a friction mechanism, compared with an existing energy dissipation device, has the characteristics of low damage, so that the function can be quickly restored after the earthquake, and the post-earthquake repair work is greatly reduced.

[0020] 2、The utility model discloses a concrete filled steel tubular column 1 is connected with the lateral plate 6 on both sides bottom through bolt 7, prevents the out-of-plane deflection of concrete filled steel tubular column 1 in the deformation process, guarantees that the concrete filled steel tubular column 1 and two-stage self-resetting damper 8 only have in-plane rotational deformation.

[0021] 3、The utility model discloses that the angle steel connector 3 of two-stage self-resetting damper 8 and bottom plate 2 are connected, can make the deformation of self-resetting damper unrestrained, and can realize the quick assembly and disassembly of two-stage self-resetting damper 8.

[0022] 4、The utility model discloses a two-stage energy dissipation and shock reduction column foot based on a self-resetting damper, under the action of the earthquake, the column foot has two-stage working mechanism due to the working mechanism of the damper, when small and medium earthquakes act, the friction energy dissipation work between the plane section cover plate 10 and the first clamping plate 12 in the joint, under the action of large and rare earthquakes, the variable section cover plate 11 and the second clamping plate 13 in the joint can realize the self-resetting of the column bottom under the action of the SMA bolt 16, so that the joint has no large residual deformation. The joint of the utility model has two-level fortification standards, and the joint has the fortification level of "small and medium earthquake energy dissipation, large earthquake and rare earthquake self-resetting".

[0023] 5、The deformation of the column foot under the action of the earthquake is mainly concentrated in the two-stage self-resetting damper 8, the first stage energy dissipation of the two-stage self-resetting damper 8 is realized by the friction between the plane section cover plate 10 and the first clamping plate 12, the second stage self-resetting of the damper is realized by the slope surface design of the first clamping plate 12 and the second clamping plate 13 and the upper and lower two variable section cover plates 11 and the cooperative action of the SMA bolt 16, in the loading process, the design of the slope makes the damper have large output, the SMA bolt 16 is stretched, in the unloading process, the SMA has the reset ability, so that the damper resets without residual deformation.

[0024] 6, The damper of the utility model all components are factory prefabricated in advance, no need for on-site welding work, now only need to assemble can, convenient for on-site construction, ensure the stability of device performance. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is overall structure schematic diagram of the utility model.

[0026] Figure 2 It is overall schematic diagram of the utility model two-stage self-resetting damper 8.

[0027] Figure 3 It is assembly schematic diagram of the utility model angle steel connector 3 and core bolt 4.

[0028] Figure 4 It is connection schematic diagram of the utility model steel pipe and core bolt 4.

[0029] Figure 5 It is assembly schematic diagram of the utility model steel pipe concrete column 1 and bottom plate 2 and lateral plate 6.

[0030] Figure 6 It is schematic diagram of the utility model steel pipe concrete column 1 and bottom plate 2.

[0031] Figure 7 It is assembly schematic diagram of the utility model bottom plate 2 and lateral plate 6.

[0032] Figure 8 is the overall schematic diagram of the utility model angle steel connector 3;Wherein, figure 8 (a) is the front view of angle steel connector 3, figure 8 (b) is the side view of angle steel connector 3.

[0033] Figure 9 It is assembly schematic diagram of the utility model steel pipe concrete column 1 and cover plate 5.

[0034] Figure 10 It is overall schematic diagram of the utility model core bolt 4 group.

[0035] Figure 11 It is structure schematic diagram of the utility model variable cross-section cover plate 11.

[0036] Figure 12 It is structure schematic diagram of the utility model first clamping plate 12.

[0037] Figure 13 It is structure schematic diagram of the utility model SMA bolt 16.

[0038] Wherein, 1, steel pipe concrete column; 2, bottom plate; 3, angle steel connector; 4, through core bolt; 5, cover plate; 6, lateral plate; 7, bolt; 8, two-stage self-resetting damper; 9, rib plate; 10, flat section cover plate; 11, variable cross-section cover plate; 111, second slope variable cross-section; 12, first clamping plate; 121, first slope variable cross-section; 13, second clamping plate; 141, first connecting plate; 142, second connecting plate; 143, third connecting plate; 151, first high-strength bolt; 152, second high-strength bolt; 153, third high-strength bolt; 16, SMA bolt; 17, cushion block. DETAILED DESCRIPTION

[0039] The specific implementation process of the utility model will be described in further detail below in combination with the drawings and examples. The following examples are used to illustrate the utility model, but not to limit the implementation scope of the utility model.

[0040] In order to improve the initial stiffness and energy dissipation capacity of the column foot of the building structure, so as to achieve the energy dissipation effect under the action of small earthquakes, and still have good energy dissipation capacity and self-resetting characteristics under the action of large earthquakes. The utility model provides an assembled two-stage energy dissipation and seismic reduction column foot based on a self-resetting damper, through assembling the two-stage self-resetting damper 8, the column foot can cope with the uncertainty of earthquakes, so that the column foot shows good energy dissipation capacity under the action of small earthquakes, and the damper can realize self-resetting effect under the action of large earthquakes and rare earthquakes. The utility model realizes an efficient seismic system, and achieves the seismic target of "pure energy dissipation under small earthquakes and self-resetting under large earthquakes".

[0041] The design concept of the column foot makes up for the deficiency of the traditional technology in the aspect of seismic performance, and while ensuring the safety performance of the structure, maximally reduces the damage of earthquakes to the vertical load-bearing components of the building structure, and realizes the fortification level of multi-stage seismic resistance. Therefore, the utility model provides an innovative solution for the design and seismic engineering of the column foot of future building structures.

[0042] As shown in Figure 1 , the utility model provides an assembled two-stage energy dissipation and seismic reduction column foot based on a self-resetting damper, which comprises a bottom plate 2 arranged at the bottom of a steel pipe concrete column 1, as shown in Figure 6 , an angle steel connector 3 is fixed to both sides of the steel pipe concrete column 1 through a through core bolt 4, a first connecting plate 141 of a two-stage self-resetting damper 8 is welded at the bottom of the angle steel connector 3, a second connecting plate 142 and a third connecting plate 143 of the two-stage self-resetting damper 8 are welded above the bottom plate 2, which can allow the steel pipe concrete column 1 to rotate and deform, a lateral plate 6 is fixed to the bottom plate 2 through a bolt 7, and is used for restraining the lateral movement of the steel pipe concrete column 1.

[0043] As shown in Figure 3 , Figure 4 ,Figure 10 As shown, the angle steel connector 3 is fixed on both sides of the concrete filled steel tubular column 1 through the core bolt 4, so the core bolt 4 must be installed when the prefabricated concrete filled steel tubular column 1 is manufactured, and only the angle steel connector 3 needs to be fixed when the construction is carried out on site.

[0044] As shown, Figure 2 The two-stage self-resetting damper 8 installed on the fabricated two-stage energy dissipation column base includes a first clamping plate 12 and a second clamping plate 13, one end of the first clamping plate 12 and the second clamping plate 13 is a plane section, the other end of the first clamping plate 12 and the second clamping plate 13 is a variable section, see Figure 12 , the upper and lower surfaces of the plane section end of the first clamping plate 12 are symmetrically connected with one end of the plane section cover plate 10, the upper and lower surfaces of the variable section end of the first clamping plate 12 are symmetrically connected with one end of the variable section cover plate 11, the upper and lower surfaces of the variable section end of the second clamping plate 13 are symmetrically connected with the other end of the variable section cover plate 11, see Figure 11 , the first connecting plate 141 is connected between the other end of the plane section cover plate 10 which is not connected with the first clamping plate 12, the upper and lower surfaces of the plane section end of the second clamping plate 13 are symmetrically connected with the second connecting plate 142 and the third connecting plate 143, the first connecting plate 141 is hinged with the bottom of the angle steel connector 3, and the second connecting plate 142 and the third connecting plate 143 are both hinged with the bottom plate 2, which can allow the concrete filled steel tubular column 1 to rotate and deform.

[0045] The two ends of the two-stage self-resetting damper 8 are provided with connecting plates, which are convenient for installation and connection with the node, and the connecting plates are respectively welded on the angle steel connector 3 and the bottom plate 2, and the connection of the two-stage self-resetting damper 8 is hinged connection, so that the two-stage self-resetting damper 8 is not affected by the connection during the deformation process.

[0046] Under the action of the earthquake, after the concrete filled steel tubular column 1 rotates, the column bottom rotates, and the two-stage self-resetting dampers 8 installed on both sides of the bottom of the concrete filled steel tubular column start to work, one side of the two-stage self-resetting dampers 8 is stretched, and the other side of the two-stage self-resetting dampers 8 is compressed.

[0047] As shown, Figure 5 The utility model discloses a concrete filled steel tubular column 1 is not installed two-stage self-resetting damper 8's both sides bottom side plate 2 on through bolt 7 all connection has lateral plate 6, for the lateral movement of concrete filled steel tubular column 1 is restricted, prevent in the deformation process of concrete filled steel tubular column 1 out of plane deflection occurs, guarantee concrete filled steel tubular column 1 and two-stage self-resetting damper 8 in plane rotation deformation, see Figure 7 .

[0048] The plane section cover plate 10 is connected with the plane section end of the first clamping plate 12 through the first high-strength bolt 151, and the variable section ends of the first clamping plate 12 and the second clamping plate 13 are respectively connected with the upper and lower variable section cover plates 11 through the SMA bolts 16.

[0049] As Figure 13 shown, the SMA bolt 16 and the contact surface of the variable cross-section cover plate 11 are provided with a pad 17 for controlling the tensile strain of the SMA bolt 16 to be less than the failure strain.

[0050] The flat cross-section cover plate 10 is connected to the first clamping plate 12 through the second high-strength bolt 152, and the second connecting plate 142 and the third connecting plate 143 are connected to the flat cross-section end of the second clamping plate 13 through the third high-strength bolt 153.

[0051] The two first inclined variable cross-sections 121 are arranged on both sides of the variable cross-section end of the first clamping plate 12 and the second clamping plate 13, and the two first inclined variable cross-sections 121 are concave structures, and the two second inclined variable cross-sections 111 are arranged on the connecting surfaces of the first clamping plate 12 and the second clamping plate 13, and the two second inclined variable cross-sections 111 are convex structures, and the concave structure is matched with the convex structure, and the middle positions of the concave structure and the convex structure are provided with holes for passing through the SMA bolt 16. When the damper is stretched, the pre-tightening force of the SMA bolt 16 enables the inclined variable cross-section to realize self-resetting function.

[0052] As Figure 9 shown, the top of the steel pipe concrete column 1 is provided with a cover plate 5 for closing the opening of the upper end of the column steel pipe and providing reinforcement.

[0053] As shown in FIG. 8, in order to ensure that the angle steel connector 3 does not occur plastic deformation under the action of earthquake, the rib plate 9 is welded in the angle steel connector 3 to ensure the strength of the angle steel connector 3.

[0054] The deformation of the column foot under the action of earthquake is mainly concentrated in the two-stage self-resetting damper 8, and the working mechanism of the two-stage self-resetting damper 8 is divided into two stages, the first stage is a pure energy dissipation stage, and the second stage is a self-resetting stage. The first stage is that the flat cross-section cover plate 10 and the first clamping plate 12 are connected through friction energy dissipation; the second stage of the two-stage self-resetting damper 8 is that the inclined surface design of the variable cross-section cover plate 11 and the first clamping plate 12 and the second clamping plate 13 and the SMA bolt 16 work together to achieve the effect of self-resetting. In the loading process, the design of the inclined surface enables the damper to have large output, the first clamping plate 12 and the second clamping plate 13 move relatively, the inclined surface drives the variable cross-section cover plate 11 to move outward, the SMA bolt 16 is stretched, and in the unloading process, the SMA bolt 16 has the reset ability, so that the two-stage self-resetting damper 8 resets without residual deformation.

[0055] The frictional sliding force between the flat section cover plate 10 and the flat section end of the first clamping plate 12 is less than the frictional sliding force between the variable section cover plate 11 and the variable section end of the first clamping plate 12 and the second clamping plate 13.

[0056] When subjected to seismic action, the concrete-filled steel tubular column 1 starts to rotate, the double-stage self-resetting dampers 8 on the tensile side are stretched, and the double-stage self-resetting dampers 8 on the compression side are compressed, when subjected to small seismic action, the first-stage column foot dissipates energy through the friction of the double-stage self-resetting dampers 8, when the deformation of the concrete-filled steel tubular column 1 continues to increase, the self-resetting mechanism of the double-stage self-resetting dampers 8 is activated, and the column foot can realize self-resetting function and has good energy dissipation capacity.

[0057] The purpose of the two-stage working mechanism design of the double-stage self-resetting dampers 8 is to make the column foot dissipate energy under small and medium seismic action, improve the initial stiffness of the column foot, and make the node have self-resetting capacity under large and rare earthquakes, so that an efficient seismic structure system is realized.

[0058] During the deformation process of the column foot under seismic action, all components remain in an elastic state, which enables the structure to realize rapid recovery function after the earthquake, and meets the development requirements of the current resilient city.

[0059] All components of the double-stage self-resetting dampers 8 are prefabricated in the factory in advance, and do not need to be welded on site, so that only assembly is needed, field construction is facilitated, and the stability of the device performance is ensured.

Claims

1. A self-centering damper based fabricated two-stage energy dissipation column base, characterized in that, The bottom plate (2) is arranged at the bottom of the steel pipe concrete column (1), and the angle steel connector (3) is arranged on both sides of the steel pipe concrete column (1), and the double-stage self-resetting damper (8) is arranged between the bottom end of the angle steel connector (3) and the bottom plate (2); The double-stage self-resetting damper (8) comprises first clamping plates (12) and second clamping plates (13), the first clamping plates (12) and the second clamping plates (13) are both provided with a flat section at one end and a variable section at the other end, the upper and lower surfaces of the flat section end of the first clamping plate (12) are symmetrically connected with one end of the flat section cover plate (10), the upper and lower surfaces of the variable section end of the first clamping plate (12) are symmetrically connected with one end of the variable section cover plate (11), the upper and lower surfaces of the variable section end of the second clamping plate (13) are symmetrically connected with the other end of the variable section cover plate (11), the first connecting plate (141) is arranged between the other end of the flat section cover plate (10) which is not connected with the first clamping plate (12), the upper and lower surfaces of the flat section end of the second clamping plate (13) are symmetrically connected with the second connecting plate (142) and the third connecting plate (143), the first connecting plate (141) is hinged to the bottom of the angle steel connector (3), and the second connecting plate (142) and the third connecting plate (143) are both hinged to the bottom plate (2).

2. The self-centering damper-based two-stage energy dissipation column base according to claim 1, wherein, The angle steel connector (3) is fixed to the two sides of the steel pipe concrete column (1) through the core penetrating bolt (4).

3. The self-centering damper-based two-stage energy dissipation column base according to claim 1, wherein, The lateral plates (6) are connected to the two sides of the side plate at the bottom of the steel pipe concrete column (1) which is not provided with the double-stage self-resetting damper (8) through the bolts (7).

4. The self-centering damper-based two-stage energy dissipation column base according to claim 1, wherein, The flat section cover plate (10) is connected with the flat section end of the first clamping plate (12) through the first high-strength bolt (151), and the variable section ends of the first clamping plate (12) and the second clamping plate (13) are respectively connected with the variable section cover plates (11) on the upper and lower surfaces through the SMA bolts (16).

5. The self-centering damper-based fabricated two-stage energy dissipation column base according to claim 4, characterized in that, The SMA bolt (16) and the variable section cover plate (11) are provided with the pad (17) between the contact surfaces.

6. The self-centering damper-based two-stage energy dissipation column base according to claim 1, wherein The other end of the flat section cover plate (10) which is not connected with the first clamping plate (12) is connected with the first connecting plate (141) through the second high-strength bolt (152), and the flat section end of the second clamping plate (13) is connected with the second connecting plate (142) and the third connecting plate (143) through the third high-strength bolt (153).

7. The self-centering damper-based two-stage energy dissipation column base according to claim 1, wherein, The variable section ends of the first clamping plate (12) and the second clamping plate (13) are both provided with two first inclined variable sections (121), the two first inclined variable sections (121) are in a concave structure, the connection surfaces of the variable section cover plates (11) and the first clamping plate (12) and the second clamping plate (13) are both provided with two second inclined variable sections (111), the two second inclined variable sections (111) are in a convex structure, and the concave structure is matched with the convex structure.

8. The self-centering damper-based two-stage energy dissipation column base according to claim 1, wherein, The frictional sliding force between the flat section cover plate (10) and the flat section end of the first clamping plate (12) is smaller than the frictional sliding force between the variable section cover plate (11) and the variable section ends of the first clamping plate (12) and the second clamping plate (13).

9. The self-centering damper-based two-stage energy dissipation column base according to claim 1, wherein, The top of the steel pipe concrete column (1) is provided with a cover plate (5); a rib plate (9) is fixed in the angle steel connector (3).

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