A liftable rocking self-centering structure in a column

Abstract

The present invention discloses a liftable rocking self-centering structure in a column, which includes a middle column and two side columns; the two side columns are respectively arranged on both sides of the middle column, and multiple cross beams are used to connect the three of them. A lower column is arranged at the bottom of the side column, the bottom of the side column contacts the top of the lower column, and a limiting device is arranged on the front, back and opposite sides of the top of the lower column, and the limiting device fits the side surface of the bottom of the side column; a connecting piece is arranged below the middle column, the bottom of the middle column is hinged to the top of the connecting piece, and the rotation directions of the hinges are all in the structural plane. A damping device is arranged on the connecting piece, and the damping direction of the damping device is the vertical direction; the bottoms of the lower column and the connecting piece are both provided with foundations, and the foundations are fixed to the ground. A steel strand is penetrated through the middle column, one end of the steel strand is fixed to the top end of the middle column, and the other end is connected to the foundation at the bottom of the connecting piece. It can reduce the rocking deformation and overturning risk of the column-foot liftable rocking core, and improve the self-centering and energy dissipation capabilities.

Description

Technical Field

[0001] The present invention belongs to the field of building engineering and structural earthquake resistance, and relates to a swing self - reset structure that can be lifted in a column. Background Art

[0002] In recent years, research has shown that using swing members can effectively avoid the concentration of structural damage in the "weak story" under earthquakes and reduce the damage of the structural system. The swing steel frame with lift - up column bases is a common form of swing members. By relaxing the restraint between the foundation and the column bases, it amplifies the swing of the structure under earthquake action, dissipates earthquake energy through the rigid swing of the upper structure and additional energy - dissipating devices, enabling the main members to have no damage or minor damage after the earthquake, effectively improving the seismic performance of the structure and realizing rapid post - earthquake restoration. Although this can effectively reduce the seismic damage of the structure, it also increases the overturning moment generated by the second - order effect of the structure. When the column base on one side of the bottom layer is lifted, due to the limited restraint of the foundation on the column base, the overturning moment causes the bottom column on the non - lifted side to be bent with single - curvature deformation, thus reducing the overturning capacity of the structure and being unfavorable for the exertion of the seismic performance of the structure. Summary of the Invention

[0003] The purpose of the present invention is to overcome the above - mentioned shortcomings of the prior art and provide a swing self - reset structure that can be lifted in a column, which can reduce the swing deformation and overturning risk of the swing core with lift - up column bases, and improve the self - reset and energy - dissipation capabilities.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A swing self - reset structure that can be lifted in a column includes a middle column and two side columns;

[0006] The two side columns are respectively arranged on both sides of the middle column. The three columns are coplanar as the structural plane, and are connected by multiple cross - beams and divided into multiple layers. A diagonal brace is arranged between each side column and the middle column on each layer; a lower - segment column is arranged at the bottom of the side column, the bottom of the side column contacts the top of the lower - segment column, and a limiting device is arranged on the front, back, and opposite sides of the top of the lower - segment column, and the limiting device fits the side surface of the bottom of the side column;

[0007] A connecting piece is arranged below the middle column, the bottom of the middle column is hinged to the top of the connecting piece, and the rotation directions of the hinges are all in the structural plane. A damping device is arranged on the connecting piece, and the damping direction of the damping device is the vertical direction; the bottom of the lower - segment column and the bottom of the connecting piece are both provided with foundations, the foundations are fixed to the ground, and a steel strand is penetrated through the middle column. One end of the steel strand is fixed to the top of the middle column, and the other end is connected to the foundation at the bottom of the connecting piece.

[0008] Preferably, a pre - embedded bottom plate is arranged at the top of the lower - segment column, and a rigid bottom plate and a reinforcement plate are respectively arranged at the bottom and the opposite side of the bottom of the side column.

[0009] Furthermore, a chamfer is provided at the bottom of one side of the rigid base plate facing away from the side column.

[0010] Preferably, the outer layer of the lower column is a square steel pipe and the inside is concrete.

[0011] Preferably, the side columns, middle columns, cross beams, diagonal braces and connectors are all made of H-shaped steel, and a box-section column is provided between the side column and the lower column.

[0012] Furthermore, side column stiffeners are provided on the side columns, middle column stiffeners are provided on the middle columns, and cross beam stiffeners are provided on the cross beams.

[0013] Preferably, a damping device is provided on each side of the connector on the structural plane. The damping device adopts a corrugated steel plate damper. The corrugated steel plate damper is arranged vertically with the corrugations in the horizontal direction. One end of the corrugated steel plate damper is fixed to the connector, and the other end is fixed to the foundation through an L-shaped connector.

[0014] Furthermore, the corrugated steel plate damper is connected to the connector and the L-shaped connector by friction-type high-strength bolts.

[0015] Preferably, one end of the diagonal brace is connected to the joint of the top of the middle column and the cross beam of each floor, and the other end is connected to the joint of the side column adjacent to the lower part of the middle column and the cross beam.

[0016] Preferably, the length of the side column at the bottommost layer is half of that of the other layers.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] In the present invention, a limiting device is provided on the lower column to fit the side column. Under the action of seismic force, the rocking frame can rotate rigidly with the column foot of the side column at the bottom layer on one side as the rotation fulcrum, realizing rocking and lifting. The side column is in close contact with the limiting device to transfer shear force, and the extrusion between the side column and the lower column can transfer vertical load, forming an inflection point at the contact of the bottom layer side column and the lower column, so that the bottom layer side column and the lower column of the structure are bent with reverse curvatures, thereby reducing the rocking of the upper structure and reducing the structural overturning moment; the prestressed steel strands are used to provide the self-resetting ability of the structure, so that the structure can return to the initial state after the earthquake without residual deformation.

[0019] Furthermore, the reinforcement plate is in close contact with the limiting device to transfer shear force, and the extrusion between the rigid base plate at the bottom of the side column and the embedded plate can transfer vertical load.

[0020] Furthermore, one side of the rigid base plate facing away from the side column is the rotation axis of the rigid base plate, and an arc chamfer is opened here to avoid stress concentration during the rocking process.

[0021] Furthermore, the column corners of the box-section columns have higher strength and stiffness compared to the H-shaped steel column feet, improving the complexity of the construction of the rocking joints.

[0022] Furthermore, when the corrugated steel plate damper undergoes shear deformation, the energy-dissipating steel plate with a corrugated shape can effectively control the out-of-plane deformation. The shear stiffness in the direction perpendicular to the corrugations is relatively large, ensuring the stability of the overall energy dissipation of the damper and improving its energy-dissipating capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The front view of the rocking self-centering structure of the present invention;

[0024] Figure 2 The perspective view of the rocking self-centering structure of the present invention;

[0025] Figure 3 The schematic diagram of the liftable part in the column of the present invention;

[0026] Figure 4 The schematic diagram of the reinforcement plate structure of the present invention;

[0027] Figure 5 The sectional view of the lower column of the present invention;

[0028] Figure 6 The exploded view of the energy-dissipating damping part structure of the present invention;

[0029] Figure 7 The schematic diagram of the corrugated steel plate damper structure of the present invention.

[0030] Wherein: 1. Foundation, 2. Lower column, 201. Square steel pipe, 202. Concrete, 3. Embedded base plate, 4. Rigid base plate, 5. In-plane limiting device, 6. High-strength bolt, 7. Out-of-plane limiting device, 8. Box-section column, 9. Reinforcement plate, 10. Side column stiffener, 11. Side column, 12. Cross beam, 13. Cross beam stiffener, 14. Support connecting piece, 15. Diagonal brace, 16. Middle column, 17. Middle column stiffener, 18. Steel strand, 19. Anchor plate, 20. Extrusion cable structure, 21. Hinge device, 22. Connecting piece, 23. Friction-type high-strength bolt, 24. Corrugated steel plate damper, 241. Upper end plate, 242. Lower end plate, 243. Web, 25. L-shaped connecting piece, 26. Anchor bolt. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0032] It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the attached drawings, and the terms "inner" and "outer" refer to the directions towards or away from the geometric center of a specific component respectively.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0034] As Figure 1 and Figure 2 shown, the liftable rocking self-centering structure in the column according to the present invention includes a middle column 16 and two side columns 11.

[0035] The two side columns 11 are respectively arranged on both sides of the middle column 16, and the three are coplanar as the structural plane. A plurality of cross beams 12 are used to connect them, which are divided into multiple layers. The length of the side column 11 at the bottom layer is half of that of the remaining layers. A herringbone diagonal brace 15 is arranged between each layer of side column 11 and the middle column 16. Foundations 1 are arranged at the bottoms of the lower column 2 and the connecting member 22, and the foundations 1 are fixed to the ground.

[0036] The side columns 11, middle column 16, cross beams 12, diagonal braces 15 and connecting members 22 are all made of H-shaped steel.

[0037] The upper column is composed of a box-section column 8, side columns 11 and a rigid floor 4. The rigid bottom plate 4 and the reinforcement plate 9 are welded to the bottom and the side of the opposite side of the box-section column 8.

[0038] The side columns 11 are welded to the top of the box-section column 8. A number of side column stiffeners 10 are arranged on the side columns 11. The cross beams 12 are bolt-welded to the side columns 11 and the middle column 13. A number of cross beam stiffeners 13 are arranged on the cross beams 12. The support connecting member 14 is welded at the beam-column joint. The diagonal brace 15 is welded to the support connecting member 14 and the box-section column 8. A number of middle column stiffeners 17 are arranged on the middle column 16.

[0039] As Figure 3 shown, the lower column 2 is buried in the foundation 1. The embedded bottom plate 3 is located at the end of the lower column 2. The bottom of the box-section column 8 contacts the top of the lower column 2. In-plane limiting devices 5 are arranged at the front and rear of the box-section column 8 at the top of the lower column 2. Out-of-plane limiting devices 7 are arranged on the opposite side of the box-section column 8 at the top of the lower column 2. The in-plane limiting devices 5 and the out-of-plane limiting devices 7 are connected to the embedded bottom plate 3 by high-strength bolts 6, and the in-plane limiting devices 5 and the out-of-plane limiting devices 7 are attached to the side of the box-section column 8.

[0040] The entire rocking joint consists of a rigid bottom plate 4, a box-section column 8, a reinforcement plate 9, and side columns 11. The rocking joint transfers the upper vertical load to the lower column 2 through the rigid bottom plate 4, as Figure 5 shown. The lower column 2 is a concrete-filled steel tube column composed of an outer square steel tube 201 and infilled concrete 202.

[0041] As Figure 4 shown, one side of the rigid bottom plate 4 facing away from the side columns is the rotation axis of the rigid bottom plate 4. A fillet radius is provided here. When the rigid bottom plate 4 serves as a rocking fulcrum, the entire rocking steel frame rotates around the horizontal line of the fillet as the rocking axis to avoid stress concentration during the rotation process. During the rocking process of the rocking joint, the reinforcement plate 9 is squeezed by the in-plane limiting device 5 and is subjected to sliding restraint, and part of the horizontal shear force is transmitted to the in-plane limiting device 5. The width between the reinforcement plate 9 and the in-plane limiting device 5 is controlled according to the plane dimensions of the building structure and the seismic fortification objective. The design of the box-section column 8 should meet the bending stiffness requirements under this condition.

[0042] As Figure 6 shown, a connector 22 is provided below the middle column 16. The bottom of the middle column 16 is hinged to the top of the connector 22, and the rotation directions of the hinges are all in the structural plane. A damping device is provided on each side of the connector 22 in the structural plane, and the damping direction of the damping device is the vertical direction. The damping device adopts a corrugated steel plate damper 24, and the corrugated steel plate damper 24 is vertically arranged with the corrugations in the horizontal direction; a foundation 1 is provided at the bottom of both the lower column 2 and the connector 22, and the foundation 1 is fixed to the ground. A steel strand 18 is penetrated through the middle column 16. One end of the steel strand 18 is fixed to the top of the middle column 16, and the other end is connected to the foundation 1 at the bottom of the connector 22.

[0043] Several holes are reserved on the middle column stiffener 17 for the steel strand 18 to pass through. The top of the steel strand 18 is anchored to the anchor plate 19 at the top of the middle column 16 through an extrusion cable structure 20, and the bottom is connected to the foundation 1. The upper end of the hinge device 21 is welded to the bottom of the middle column 16, and the lower end is welded to the connector 22. The upper and lower end plates of the corrugated steel plate damper 24 are connected to the connector 22 and the L-shaped connector 25 by a number of friction-type high-strength bolts 23. The L-shaped connector is connected to the foundation 1 by a number of anchor bolts 26.

[0044] The energy dissipation device of the rocking core consists of a hinge device 21, a connecting member 22, a friction type high-strength bolt 23, a corrugated steel plate damper 24 and an L-shaped connecting member 25. After the rocking frame reaches the uplifting moment, the rocking and uplifting movement begins. At this time, the hinge device 21 fixed under the middle column 16 drives the connecting member 22 to generate an uplifting displacement, and the corrugated steel plate damper 24 starts to be stressed and gradually enters the shear plastic energy dissipation. Its in-plane stiffness also provides part of the lateral stiffness for the structure, and the out-of-plane stiffness ensures that buckling does not occur during the loading process and affects the overall performance of the structure.

[0045] As Figure 7 shown, the corrugated steel plate damper 24 is composed of an upper end plate 241, a lower end plate 242 and a corrugated web 243. The corrugated web 243 is formed by cold pressing and is welded to the upper end plate 241 and the lower end plate 242. The specific dimensions of the corrugated steel plate web members are designed according to the value range specified in the Technical Specification for Steel Structures with Corrugated Webs.

[0046] The corrugated steel plate damper 24 is made of steel with a relatively low yield point, providing better energy dissipation capacity and fatigue performance for the damper. The good fatigue performance and welding performance of the low yield point steel ensure that it will not break prematurely during the severe reciprocating plastic deformation process, providing a stable energy dissipation capacity for the structure. The main components in the rocking core, such as the side columns 11, the middle column 16, the cross beams 12, the diagonal braces 15 and the connecting members 22, are all made of Q460 steel, ensuring that the designed cross-sectional dimensions of the main components are not too large and are in the elastic stress state during the rocking and uplifting process. After the earthquake, only the damaged dampers need to be replaced to quickly restore the service function of the structure. The specific extrusion cable structure of the steel strand 18 refers to the relevant requirements in the "Pulling and Compressing Anchoring Steel Strand Cables JT / T 850-2013".

[0047] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0048] It should be understood that the above description is for illustrative purposes and not for limitation. Many embodiments and many applications other than the examples provided will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of the present teachings should not be determined with reference to the above description, but should be determined with reference to the full scope of the foregoing claims and the equivalents thereof. For the sake of completeness, all articles and references, including patent applications and published announcements, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein from the foregoing claims is not intended to abandon such subject matter, nor should it be considered that the applicant has not considered such subject matter as part of the disclosed inventive subject matter.

Claims

1. A liftable rocking self - resetting structure in a column, Characterized in that, It includes a middle column (16) and two side columns (11); The two side columns (11) are respectively arranged on both sides of the middle column (16), and the three are coplanar as the structural plane. A plurality of cross - beams (12) are used to connect them, which are divided into multiple layers. A diagonal brace (15) is arranged between each layer of side column (11) and the middle column (16); A lower column (2) is arranged at the bottom of the side column (11), the bottom of the side column (11) contacts the top of the lower column (2), and a limiting device is arranged on the front, back and opposite sides of the top of the lower column (2) in contact with the side of the bottom of the side column (11), and the limiting device fits the side of the bottom of the side column (11); A connecting piece (22) is arranged below the middle column (16), the bottom of the middle column (16) is hinged to the top of the connecting piece (22), and the rotation directions of the hinges are all on the structural plane. A damping device is arranged on the connecting piece (22), and the damping direction of the damping device is the vertical direction; Foundations (1) are arranged at the bottoms of both the lower column (2) and the connecting piece (22), the foundation (1) is fixed to the ground, a steel strand (18) is penetrated through the middle column (16), one end of the steel strand (18) is fixed to the top of the middle column (16), and the other end is connected to the foundation (1) at the bottom of the connecting piece (22); The side columns (11), middle column (16), cross - beams (12), diagonal braces (15) and connecting pieces (22) are all made of H - shaped steel, and a box - section column (8) is arranged between the side column (11) and the lower column (2); One damping device is arranged on each side of the connecting piece (22) on the structural plane. The damping device adopts a corrugated steel plate damper (24), the corrugated steel plate damper (24) is arranged vertically, the corrugations are in the horizontal direction, one end of the corrugated steel plate damper (24) is fixed to the connecting piece (22), and the other end is fixed to the foundation (1) through an L - shaped connecting piece (25).

2. The liftable rocking self - resetting structure in a column according to claim 1, Characterized in that, An embedded bottom plate (3) is arranged at the top of the lower column (2), and a rigid bottom plate (4) and a reinforcement plate (9) are respectively arranged at the bottom and the opposite side of the bottom of the side column (11).

3. The liftable rocking self - resetting structure in a column according to claim 2, Characterized in that, The bottom of the side of the rigid bottom plate (4) facing the opposite side of the side column (11) is provided with a chamfer.

4. The liftable rocking self - resetting structure in a column according to claim 1, Characterized in that, The outer layer of the lower column (2) is a square steel pipe (201), and the inside is concrete (202).

5. The liftable rocking self - resetting structure in a column according to claim 1, Characterized in that, Side column stiffeners (10) are arranged on the side columns (11), middle column stiffeners (17) are arranged on the middle column (16), and cross - beam stiffeners (13) are arranged on the cross - beams (12).

6. The liftable rocking self - resetting structure in a column according to claim 1, Characterized in that, The corrugated steel plate damper (24) is connected to the connecting piece (22) and the L - shaped connecting piece (25) through friction - type high - strength bolts (23).

7. The liftable rocking self - resetting structure in a column according to claim 1, Characterized in that, One end of the diagonal brace (15) is connected to the connection between the top of the middle column (16) and the cross beam (12) on each floor, and the other end is connected to the connection between the side column (11) adjacent to and below the middle column (16) and the cross beam (12).

8. The liftable rocking self-resetting structure in the column according to claim 1, characterized in that, the length of the side column (11) at the bottommost layer is half of that of the remaining layers.

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