A column-lifting controlled swing frame for strengthening a steel frame structure and an assembly method thereof

Abstract

The present invention discloses a column-lifting controlled swing frame for reinforcing a steel frame structure and an assembly method thereof. Multiple external swing frames are arranged on the side of the main steel frame. The external swing frames include two swing side columns and multiple transverse supports. The multiple transverse supports are arranged in the vertical direction to connect the two swing side columns. The swing side columns are hinged to the support columns on the side of the main steel frame by rigid connectors. A damper is connected between the swing side columns and the support columns on the side of the main steel frame. A longitudinal horizontal support is connected between the swing side columns of adjacent external swing frames. Each swing side column is divided into an upper column and a lower column. The transverse supports are all located on the upper column. The outer diameter of the lower column is larger than the outer diameter of the upper column. The bottom of the upper column is placed on the center of the top of the lower column. The top surface of the lower column is provided with a vertical limit plate around the bottom of the upper column. The bottom of the lower column is fixed to the ground through a foundation. While having sufficient seismic resistance, the swing deformation of the structure is effectively controlled and reduced.

Description

Technical Field

[0001] The invention belongs to the field of structural earthquake resistance and relates to a column-lifting controlled swing frame of a reinforced steel frame structure and an assembly method thereof. Background Art

[0002] Steel frame structures are widely used in high-rise and super-high-rise buildings because of their high strength, light weight, good ductility and energy dissipation capacity. However, under strong earthquakes, due to the large stiffness of the beam-column joints, the plastic deformation of the material is difficult to develop, and brittle failure is very likely to occur at the beam-column welding joints. Since then, a lot of research has been conducted on the steel structure beam-column connection nodes, with the aim of making the node area reach the plastic hinge outward during strong earthquakes to avoid cracks in the nodes and brittle failure. However, after experiencing strong earthquakes, the steel frames of these nodes have large residual deformations, and the deformation of the structure and components is large, which makes it difficult to repair after the earthquake or greatly increases the cost of repair.

[0003] In addition, steel frame structures are prone to cross-layer failure modes, which can easily form weak layers in the structure. Structural damage is concentrated in local areas, and when failure occurs, the structure and materials are not fully utilized. The overall ductility, energy absorption capacity and bearing capacity of the structure are not high.

[0004] In recent years, restorable functional structures have upgraded the seismic design of structures from ensuring life safety to controlling earthquake damage to structures, becoming one of the current research hotspots in the field of structural seismic resistance. As a type of restorable functional structure, the rocking structure relaxes certain constraints at the interface between the superstructure and the foundation or at the interface between structural components, allowing the structure to undergo a certain relative deformation at the relaxed position, thereby changing the stress state of each component in the structure, reducing structural damage, and improving the seismic performance of the structure. The rocking structure system plays an important role in both the construction of new building structures and the reinforcement and renovation of existing building structures, and has broad application prospects.

[0005] At present, the addition of sway walls is a common form of reinforcement of existing structures. According to the constraints of the wall's rotation in the plane, it can generally be divided into two forms: controlled sway walls and free sway walls. Since it has a large lateral bearing capacity and lateral stiffness, it is applied to the reinforcement of the frame structure system to effectively improve the seismic performance and failure mode of the overall structure. However, after the sway wall is added to the original structure, the structural mass is increased, the seismic force on the structure becomes larger, and the structural dynamic response is also amplified; when the main structure undergoes a large lateral displacement, the deadweight of the sway wall will produce a large second-order effect, thereby exerting a considerable overturning moment on the main structure; it is very easy to crack, and after cracking, the bending stiffness of the wall drops rapidly and stops working; it has a large deadweight and is difficult to install, and the performance requirements of the chain rod and wall bottom hinge support connected to the main structure are high. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and to provide a column-lifting controlled swing frame for reinforcing a steel frame structure and an assembly method thereof, which can effectively control the overall structural deformation mode and plastic energy consumption distribution while reducing the structural swing deformation, curb the generation of weak layers, and improve the structural ductility and bearing capacity.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A column-lifting controlled swing frame of a reinforced steel frame structure, comprising a main steel frame and multiple external swing frames;

[0009] Multiple external swing frames are arranged on the side of the main steel frame, and each external swing frame includes two swing side columns and multiple transverse supports. The multiple transverse supports connect the two swing side columns in the vertical direction. The swing side columns and the support columns on the side of the main steel frame are hinged with rigid connectors. The number of external swing frames on each side of the main steel frame is the same as the number of support columns on the side of the main steel frame; dampers are arranged between adjacent rigid connectors of the same external swing frame, and both ends of the damper are respectively connected to the swing side column and the support column on the side of the main steel frame; longitudinal horizontal supports are connected between the swing side columns of adjacent external swing frames, and the number and height of the longitudinal horizontal supports are consistent with those of the transverse supports.

[0010] Each swing side column is divided into an upper column and a lower column. The lateral supports are all located on the upper column. The outer diameter of the lower column is larger than that of the upper column. The bottom of the upper column is placed on the center of the top of the lower column. The top surface of the lower column is provided with a vertical limit plate around the bottom of the upper column. The bottom of the lower column is fixed to the ground through a foundation.

[0011] Preferably, the number and height of the transverse supports and rigid connectors are consistent with those of the beams of the main steel frame.

[0012] Preferably, the rigid connector is made of H-shaped steel with ear plates at both ends, and hinged ear plates are provided at the position where the rigid connector is connected to the swing side column and the support column, and the ear plates are hinged to each other with pins.

[0013] Preferably, the damper is a corrugated steel plate damper, which is vertically arranged with the corrugations in the horizontal direction.

[0014] Preferably, both the upper column and the lower column are double-layer steel pipe structures, and the inner interlayer is filled with concrete.

[0015] Furthermore, one end of a steel strand is connected to the top of the upper column, and after the steel strand passes through the hollow parts of the upper column and the lower column in sequence, the other end is connected to the foundation.

[0016] Furthermore, UHPC is used as the concrete in the inner mezzanine of the upper column and the lower column.

[0017] Preferably, an inclined support is arranged in the middle of the bottom of each lateral support, and the inclined support is a herringbone support. The two ends of the bottom of the inclined support are connected to the rocking side columns on both sides and the two ends of the next layer of lateral supports, and the two ends of the bottom of the lowest inclined support are connected to the tops of the lower columns on both sides.

[0018] Preferably, stiffening ribs are provided on the transverse supports.

[0019] A method for assembling a column-lift controlled swing frame based on any one of the above reinforced steel frame structures comprises the following steps:

[0020] Step 1: The bottom of the lower column is fixed on the ground through the foundation, and the limit plate is vertically fixed on the top of the lower column;

[0021] Step 2: Connect the lateral support to the upper columns of the two swing side columns, place the bottom of the upper column on the center of the top of the lower column, and place the bottom of the upper column between multiple limit plates to form a single external swing frame;

[0022] Step 3, hinge the support column on the side of the main steel frame with the column swing side column close to it by using rigid connectors and dampers;

[0023] Step 4: Connect the column swing side columns between adjacent external swing frames using longitudinal horizontal supports.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention achieves the goal of reducing the risk of structural overturning and avoiding the collapse of the steel frame structure by lifting the controlled lifting sway frame in the additional column of the main steel frame structure. The external sway frame uses the column foot of the lower column on one side as a rotation fulcrum to produce a rigid body rotation, which can effectively control and reduce the sway deformation of the structure after reinforcing the existing building structure so that it has sufficient seismic resistance. It avoids the structural damage under earthquake from being concentrated on the "weak layer", reduces the damage to the structural system, and reduces the risk of structural overturning.

[0026] Furthermore, the connection between the external swing frame and the frame structure is a large deformation area of ​​the structure. The arrangement of dampers here can dissipate a large amount of seismic energy. During the swinging process of the external swing frame, the arrangement of dampers here can dissipate a large amount of seismic energy. After the earthquake, only the damaged dampers need to be replaced to quickly restore the structure's usability.

[0027] Furthermore, when the corrugated steel plate damper undergoes shear deformation, the corrugated energy-absorbing steel plate can effectively control the out-of-plane deformation, and the flange plate ensures the coordinated deformation of the web and the flange by constraining the corrugated web, thereby ensuring the stability of the overall energy consumption of the damper and improving the energy consumption capacity.

[0028] Furthermore, compared with steel columns, concrete-filled steel tube columns have higher strength and rigidity, good economy and construction performance, simple swing node structure, and good building applicability.

[0029] Furthermore, the steel strands are placed inside the double-layer steel columns, which not only provides a greater overturning moment than in the frame, but also avoids the influence of changes in the external environment on its mechanical properties.

[0030] Furthermore, the use of UHPC can avoid the oversizing of the rocking side column cross-section and the premature concrete damage that would cause the work to be withdrawn. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the structure of the present invention;

[0032] Figure 2 This is a single-frame structure elevation layout diagram of the present invention;

[0033] Figure 3 It is a schematic diagram of the structure of the external swing frame of the present invention;

[0034] Figure 4 It is a schematic elevation diagram of the external swing frame of the present invention;

[0035] Figure 5 It is a schematic diagram of the swing side column structure of the present invention;

[0036] Figure 6 It is a schematic diagram of the rigid connector structure of the present invention;

[0037] Figure 7 It is a schematic diagram of the connection structure of the corrugated steel plate damper of the present invention.

[0038] Among them, 1. foundation, 2. main steel frame, 3. hinged ear plate, 4. rigid connector, 41. H-shaped steel, 42. ear plate, 5. pin shaft, 6. external swing frame, 7. stiffening ribs, 8. lateral support, 9. inclined support, 10. support connector, 11. swing side column, 12. upper column, 13. lower column, 131. double-layer steel pipe, 132. concrete, 14. steel strand, 15. extrusion anchor device, 16. rigid bottom plate, 17. limit plate, 18. corrugated steel plate damper, 19. damper connecting plate, 20. high-strength bolts, 21. longitudinal horizontal support. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only 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 ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0040] It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to directions in the drawings, and the words "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein 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 related listed items.

[0042] like Figure 1 As shown, the column-lifting controlled swing frame of the reinforced steel frame structure described in the present invention includes a main steel frame 2 and multiple external swing frames 6.

[0043] Multiple external swing frames 6 are arranged on any side of the main steel frame 2, front, back, left, or right. The external swing frames 6 and the main steel frame 2 can form a straight, T-shaped, L-shaped or cross-shaped structure. The number of external swing frames 6 on each side of the main steel frame 2 is the same as the number of support columns on the side of the main steel frame 2.

[0044] like Figure 2-4 As shown, the external swing frame 6 is mainly composed of a hinged ear plate 3, a swing side column 11, a lateral support 8, an inclined support 9, a steel strand 14 and a damper connecting plate 19. The hinged ear plate 3 is welded to the side of the external swing frame 6 and corresponds to the beam-column node position of the main steel frame 2.

[0045] The transverse support 8 is connected between two parallel rocking side columns 11 , and a plurality of stiffening ribs 7 are arranged on the transverse support 8 .

[0046] The oblique support 9 is a herringbone support, which is fixed to the next layer of lateral support 8 and the rocking side column 11 through a support connector 10 , and the bottom ends of the lowest oblique support 9 are connected to the tops of the lower column 13 on both sides.

[0047] The swing side column 11 is a hollow sandwich steel tube concrete, such as Figure 5As shown, it is composed of a double-layer steel pipe 131 and concrete 132, and the concrete 132 is filled into the interlayer of the double-layer steel pipe 131. The swing side column 11 is parallel to each frame column of the main steel frame 2 and is in the same plane. The single column is disconnected at half of the bottom layer to be divided into an upper column 12 and a lower column 13. The lateral supports 8 are all located on the upper column 12. The cross-sectional area of ​​the lower column 13 is larger than that of the upper column 12, and the bottom of the lower column 13 is fixedly connected to the foundation 1. The top surface of the lower column 13 is provided with a vertical limit plate 17 around the bottom of the upper column 12. A rigid bottom plate 16 with an opening is welded to the bottom of the upper column 12. The two form a whole and are placed flat on the top of the lower column 13.

[0048] like Figure 4 As shown, the steel strand 14 is a prestressed steel strand, which is vertically arranged in the cavity of the rocking side column 11, the top is anchored at the end of the top rocking side column 11, and the lower part is connected to the foundation 1, and both are anchored by the extrusion anchor device 15. For the specific extrusion cable structure, refer to the relevant requirements of "Tension and Compression Anchored Steel Strand Cable JT / T850-2013".

[0049] The adjacent external swing frames 6 are connected to form a whole through the longitudinal horizontal supports 21 , and the number and height of the longitudinal horizontal supports 21 are consistent with those of the transverse supports 8 .

[0050] The damper connecting plate 19 is a steel plate with threads and is fixedly connected to the middle of the rocking side column 11 on the second floor and above.

[0051] A hinged ear plate 3 is fixedly connected to the outer side of the beam-column node of the main steel frame 2, and a damper connecting plate 19 is fixedly connected to the middle of the side column of the second-story and above steel frame near the external swing frame 6.

[0052] The swing side column 11 is hinged to the supporting column on the side of the main steel frame 2 by a rigid connector 4. Figure 6 As shown, the rigid connector 4 is composed of ear plates 42 welded at both ends of an H-shaped steel 41. The ear plates 42 at both ends of the rigid connector 4 are connected to the hinged ear plates 3 at both ends of the steel frame 2 and the external swing frame 6 through the pin 5, so as to control the damage and deformation of the steel frame by using the external swing frame and improve the seismic performance.

[0053] A damper is provided between adjacent rigid connectors 4 of the same external swing frame 6, and both ends of the damper are connected to the swing side column 11 and the support column on the side of the main steel frame 2, respectively. Figure 7As shown, the damper of this embodiment adopts a corrugated steel plate damper 18, and the two ends of the corrugated steel plate damper 18 are respectively connected to the damper connecting plate 19 of the external swing frame 6 and the main steel frame 2 by high-strength bolts 20. The corrugated steel plate damper 18 is vertically arranged, and the corrugations are located in the horizontal direction, providing energy dissipation for the structure under the action of external loads. The corrugated steel plate damper 18 adopts steel with a low yield point (LYP160, LYP225, Q235, etc.) to provide better energy dissipation capacity and fatigue performance for the damper, and the size is designed according to the value range specified in the "Technical Code for Corrugated Web Steel Structure"; during the swing and lifting process of the external swing frame 6, the beam-column node connecting the column foot is prevented from being subjected to a large force and entering a plastic state, and after the earthquake, only the damaged damper needs to be replaced to quickly restore the use function of the structure.

[0054] The double-layer steel pipe 131 of the swing side column 11 is made of high-strength steel Q460, and the concrete 132 is ultra-high performance concrete UHPC. The use of UHPC can avoid the swing side column from being too large in cross-section and the concrete from being damaged prematurely and withdrawing from work.

[0055] The assembly method of the column-lift controlled sway frame of the reinforced steel frame structure comprises the following steps:

[0056] Step 1: A hole is reserved in the lower column 13, and a steel plate with holes is embedded in the upper part, and the whole is fixed to the foundation 1.

[0057] Step 2: The limiting plate 17 is placed flush with the side surface of the lower column 13 and welded to the embedded steel plate.

[0058] Step three: The transverse support 8 is welded to the swing side column 11, and the corresponding outer side of the swing side column 11 is welded with a hinged ear plate 3; the damper connecting plate 19 with bolt holes is welded to the middle section of the swing side column 11; the two herringbone inclined supports 9 on each layer are welded to the swing side column 11 and the transverse support 8 through the support connector 10; a rigid bottom plate 16 with a hole welded at the bottom of the upper column 12 is placed on the embedded bottom plate of the lower column 13 to form a single external swing frame 6.

[0059] Step 4: Weld the hinged ear plate 3 and the damper connecting plate 19 to the outside of the node of the main steel frame 2 and the middle of each layer of H steel column.

[0060] Step 5: The ear plates 42 at both ends of the rigid connector 4 cooperate with the ear plates 42 of the rocking side column 11 and the main steel frame 2 through the pin 5.

[0061] Step 6: Connect both ends of the corrugated steel plate damper 18 to the damper connecting plate 19 of the rocking side column 11 and the main steel frame 2 through high-strength bolts 20 .

[0062] Step seven: Weld the longitudinal horizontal support 21 to the swing side column 11 of the adjacent external swing frame 6, thereby achieving a reinforced connection between the external swing frame 6 and the main steel frame 2.

[0063] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0064] It should be understood that the above description is for illustration and not for limitation. Many embodiments and many applications beyond 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 rather with reference to the foregoing claims and the full scope of equivalents to which such claims are entitled. For the purpose of comprehensiveness, all articles and references, including disclosures of patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not intended to be a waiver of such subject matter, nor should it be considered that the applicant has not considered such subject matter to be part of the disclosed inventive subject matter.

Claims

1. A column-lift controlled swing frame for strengthening a steel frame structure, characterized in that: It comprises a main steel frame (2) and a plurality of external swing frames (6); A plurality of external swing frames (6) are arranged on the side of the main steel frame (2), each of the external swing frames (6) comprising two swing side columns (11) and a plurality of transverse supports (8), the plurality of transverse supports (8) connecting the two swing side columns (11) in a vertical arrangement, the swing side columns (11) and the support columns on the side of the main steel frame (2) are hingedly connected by rigid connectors (4), the number of external swing frames (6) on each side of the main steel frame (2) is the same as the number of support columns on the side of the main steel frame (2); a damper is arranged between adjacent rigid connectors (4) of the same external swing frame (6), the two ends of the damper are respectively connected to the swing side columns (11) and the support columns on the side of the main steel frame (2); a longitudinal horizontal support (21) is connected between the swing side columns (11) of adjacent external swing frames (6), the number and height of the longitudinal horizontal support (21) are the same as those of the transverse supports (8); Each swing side column (11) is divided into an upper column (12) and a lower column (13), the transverse support (8) is located on the upper column (12), the outer diameter of the lower column (13) is larger than the outer diameter of the upper column (12), the bottom of the upper column (12) is placed on the center of the top of the lower column (13), the top surface of the lower column (13) is provided with a vertical limit plate (17) around the bottom of the upper column (12), and the bottom of the lower column (13) is fixed to the ground through a foundation (1); The damper adopts a corrugated steel plate damper (18), the corrugated steel plate damper (18) is arranged vertically, and the corrugations are located in the horizontal direction; The upper column (12) and the lower column (13) are both double-layer steel pipe (131) structures, and the inner interlayer is filled with concrete (132); One end of a steel strand (14) is connected to the top of the upper column (12). The steel strand (14) passes through the hollow parts of the upper column (12) and the lower column (13) in sequence, and the other end is connected to the foundation (1).

2. The column-mounted lifting controlled swing frame of the reinforced steel frame structure according to claim 1, characterized in that: The number and height of the transverse supports (8) and the rigid connectors (4) are consistent with those of the crossbeams of the main steel frame (2).

3. The column-mounted lifting controlled swing frame of the reinforced steel frame structure according to claim 1, characterized in that: The rigid connection piece (4) is made of H-shaped steel (41) and is provided with ear plates (42) at both ends. A hinged ear plate (3) is provided at the position where the swing side column (11) and the support column connect the rigid connection piece (4). The ear plate (42) and the hinged ear plate (3) are hingedly connected by a pin shaft (5).

4. The column-mounted lifting controlled sway frame of the reinforced steel frame structure according to claim 1, characterized in that: The concrete in the inner interlayer of the upper column (12) and the lower column (13) is made of UHPC.

5. The column-mounted lifting controlled sway frame of the reinforced steel frame structure according to claim 1, characterized in that: An inclined support (9) is arranged in the middle of the bottom of each transverse support (8), the inclined support (9) is a herringbone support, the bottom ends of the inclined support (9) are connected to the swing side columns (11) on both sides and the two ends of the next layer of transverse support (8), and the bottom ends of the lowest inclined support (9) are connected to the tops of the lower column (13) on both sides.

6. The column-mounted lifting controlled sway frame of the reinforced steel frame structure according to claim 1, characterized in that: A stiffening rib (7) is provided on the transverse support (8).

7. A method for assembling a column-lift controlled swing frame of a reinforced steel frame structure according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: The bottom of the lower column (13) is fixed to the ground through the foundation (1), and the limit plate (17) is vertically fixed to the top of the lower column (13); Step 2, connecting the lateral support (8) to the upper columns (12) of the two swing side columns (11), placing the bottom of the upper column (12) on the center of the top of the lower column (13), and positioning the bottom of the upper column (12) between a plurality of limit plates (17), thereby forming a single external swing frame (6); Step 3, hinge the support column on the side of the main steel frame (2) with the adjacent column swing side column (11) by using a rigid connector (4) and a damper; Step 4: Connect the column swing side columns (11) between adjacent external swing frames (6) using longitudinal horizontal supports (21).

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