CN114635584A - Lifting controlled swing frame in column of reinforced steel frame structure and assembling method thereof - Google Patents

Abstract

The invention discloses a post-in-post lifting controlled swing frame for reinforcing a steel frame structure and an assembly method thereof, wherein a plurality of external swing frames are arranged on the side surface of a main body steel frame, each external swing frame comprises two swing side posts and a plurality of transverse supports, the plurality of transverse supports are arranged in the vertical direction to connect the two swing side posts, and the swing side posts are hinged with support posts on the side surface of the main body steel frame by rigid connecting pieces; a damper is connected between the swing side column and the support column on the side surface of the main body steel frame; and a longitudinal horizontal support is connected between the swing side columns of the adjacent externally attached swing frames. Every side column that sways divide into upper segment post and hypomere post, and horizontal support all is located the upper segment post on, and hypomere post external diameter is greater than the upper segment post external diameter, and the upper segment capital portion is taken at hypomere capital portion central point and is put, and hypomere capital portion is provided with the limiting plate of vertical direction around the upper segment capital portion, and hypomere capital portion is fixed subaerial through the basis. The structure has enough shock resistance, and simultaneously effectively controls and reduces the swinging deformation of the structure.

Description

In-column lifting controlled rocking frame for reinforcing steel frame structure and assembling method thereof

technical field

The invention belongs to the field of structural earthquake resistance, and relates to a column-lifting controlled rocking frame for reinforcing a steel frame structure and an assembling method thereof.

Background technique

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 the action of strong earthquake, due to the high stiffness of beam-column joints, the plastic deformation of the material is difficult to develop, and brittle failure easily occurs in beam-column welded joints. Since then, a lot of research has been done on beam-column connection joints of steel structures, the purpose is to make the plastic hinges move outward when the joint area reaches a strong earthquake, so as to avoid cracks in the joints and brittle failure. The larger the residual deformation, the larger the deformation of the structure and components, and the difficult to repair or the repair cost after the earthquake is greatly increased.

In addition, the steel frame structure is prone to cross-layer failure mode. This kind of failure mode is prone to form weak layers in the structure, and the structural damage is concentrated in local areas. When the failure occurs, the structure and materials are not fully utilized. The overall ductility and energy dissipation capacity of the structure and bearing capacity is not high.

In recent years, recoverable functional structures have upgraded the seismic design of structures from guaranteeing life safety to controlling seismic damage of structures, which has become one of the current research hotspots in the field of structural seismic resistance. As one of the recoverable functional structures, the rocking structure allows certain relative deformation of the structure at the relaxed position by relaxing some constraints at the interface between the superstructure and the foundation or at the interface of the structural members, thereby changing the components in the structure. The stress state can be reduced, the structural damage can be reduced, and the seismic performance of the structure can be improved. The rocking structure system plays an important role in both the new building structure and the reinforcement and reconstruction of the existing building structure, and has a broad application prospect.

At present, the additional rocking wall is a common realization form of existing structural reinforcement. According to the constraints of the wall's rotation in the plane, it can be generally divided into two forms: controlled rocking wall and free rocking wall. Because of its large anti-side bearing capacity and anti-side stiffness, it can effectively improve the seismic performance and failure mode of the overall structure when it is used in the reinforcement of frame structure systems. However, after adding rocking walls to the original structure, the mass of the structure is increased, the seismic force on the structure is increased, and the dynamic response of the structure is also amplified; when the main structure undergoes a large lateral displacement, the self-weight of the rocking wall will produce a large two-dimensional order effect, thus exerting a considerable overturning moment on the main structure; it is very easy to crack, and the flexural rigidity of the wall drops rapidly after cracking and exits work; it is heavy and difficult to install, and the chain rods and wall bottom hinges connected to the main structure The bearing performance requirements are high.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art, and to provide a reinforced steel frame structure in-column lifting controlled rocking frame and its assembly method, which can effectively control the overall structural deformation mode and plasticity while reducing the structural rocking deformation. Distribution of energy consumption, curb the generation of weak layers, and improve structural ductility and bearing capacity.

To achieve the above object, the present invention adopts the following technical solutions to realize:

A mid-column lifting controlled rocking frame for reinforcing a steel frame structure, comprising a main steel frame and a multi-joint externally attached rocking frame;

The multiple external rocking frames are arranged on the side of the main steel frame. Each external rocking frame includes two rocking side columns and multiple lateral supports. The multiple lateral supports are arranged in the vertical direction to connect the two rocking side posts. The rocking side column and the supporting column on the side of the main steel frame are hinged by rigid connectors, and the number of external rocking frames on each side of the main steel frame is the same as the number of supporting columns on the side of the main steel frame; adjacent to the same external rocking frame A damper is arranged between the rigid connecting pieces, and the two ends of the damper are respectively connected with the rocking side column and the supporting column on the side of the main steel frame; longitudinal horizontal supports are connected between the rocking side columns of the adjacent externally attached rocking frames, and the longitudinal horizontal supports are Consistent with the number and height of lateral supports.

Each swinging side column is divided into an upper column and a lower column. The lateral support is located on the upper column. The outer diameter of the lower column is larger than the outer diameter of the upper column. A vertical limit plate is arranged around, and the bottom of the lower column is fixed on the ground through the foundation.

Preferably, the number and height of the transverse supports and the rigid connecting pieces are the same as the number and height of the transverse beams of the main steel frame.

Preferably, the rigid connecting piece is made of H-shaped steel, and the two ends are provided with lugs, and the position where the rocking side column and the support column are connected to the rigid connecting piece is provided with a hinged lug, and the lug and the hinged lug are hinged by a pin shaft.

Preferably, the damper adopts a corrugated steel plate damper, the corrugated steel plate damper is arranged vertically, and the corrugation is located in a horizontal direction.

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

Further, one end of the steel strand is connected to the top of the upper column, and the other end of the steel strand is connected to the foundation after passing through the hollow parts of the upper column and the lower column in sequence.

Further, UHPC is used for the concrete in the inner interlayer of the upper and lower columns.

Preferably, an oblique support is provided in the middle of the bottom of each lateral support, and the oblique support is a herringbone support. Top of side lower column.

Preferably, a stiffening rib is provided on the lateral support.

A method for assembling a controlled rocking frame to be lifted in a column based on any one of the above reinforced steel frame structures, comprising the following steps:

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;

Step 2: Connect the lateral support to the upper column of the two swinging 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-column externally attached rocking frame;

Step 3: The supporting column on the side of the main steel frame is hinged with the column swinging side column close to it by rigid connectors and dampers;

Step 4: Connect the column rocking side columns between adjacent externally attached rocking frames by vertical horizontal support.

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

In the present invention, after the rocking frame is lifted in a controlled manner in the additional column of the main steel frame structure, the rigid body rocking and shock absorption effects of the externally attached rocking frame can be fully exerted without the need for excessive lateral displacement of the main structure, so as to reduce the overturning of the structure. The purpose of risk is to avoid the collapse of the steel frame structure; the external rocking frame rotates rigidly around the lower column foot of one side as the pivot point, which can strengthen the existing building structure and make it have sufficient seismic performance. At the same time, it is effective. Control and reduce the rocking deformation of the structure; avoid the structural damage concentrated in the "weak layer" under the earthquake, reduce the damage of the structural system, and reduce the risk of structural overturning.

Further, the connection between the external rocking frame and the frame structure is a large deformation area of the structure, where the dampers are arranged to dissipate a large amount of seismic energy. After the earthquake, only the damage damper needs to be replaced to quickly restore the function of the structure.

Further, when the corrugated steel plate damper undergoes shear deformation, the corrugated energy-consuming 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, ensuring the stability of the overall energy consumption of the damper. improve energy consumption.

Further, the use of concrete-filled steel tubular columns has higher strength and stiffness than steel columns, and has good economy and construction performance, the structure of the swing joint is simple, and the building applicability is better.

Further, the steel strand is placed inside the double-layer steel column, which provides a larger overturning moment than the frame, and also avoids the impact on its mechanical properties due to changes in the external environment.

Further, the use of UHPC can avoid the excessively large section size of the swaying side column and the early damage of the concrete to exit the work.

Description of drawings

Fig. 1 is the structural representation of the present invention;

Fig. 2 is the elevational arrangement diagram of the single-branch structure of the present invention;

3 is a schematic structural diagram of an externally attached rocking frame of the present invention;

4 is a schematic elevation view of an externally attached rocking frame of the present invention;

Fig. 5 is the structural schematic diagram of the rocking side column of the present invention;

6 is a schematic structural diagram of a rigid connector of the present invention;

7 is a schematic diagram of the connection structure of the corrugated steel plate damper of the present invention.

Among them, 1, foundation, 2, main steel frame, 3, hinged lugs, 4, rigid connectors, 41, H-beam, 42, lugs, 5, pins, 6, external rocking frame, 7, stiffeners , 8, lateral support, 9, diagonal 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 anchoring 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 ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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 The embodiments of the present invention, and all other embodiments obtained by those of ordinary skill in the art without creative work, fall within the protection scope of the present invention.

It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the words "inner" and "outer" ” refer to directions towards or away from the geometric center of a particular part, respectively.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in FIG. 1 , the in-pillar controlled rocking frame for reinforcing the steel frame structure according to the present invention includes a main steel frame 2 and multiple externally attached rocking frames 6 .

The multi-attached rocking frame 6 is arranged on either side of the main body steel frame 2, the front, rear, left, right, and right. The external rocking frame 6 and the main steel frame 2 can form an in-line, T-shaped, L-shaped or cross-shaped structure. The number of externally attached rocking frames 6 on each side of the main body steel frame 2 is the same as the number of the side support columns of the main body steel frame 2 .

As shown in FIGS. 2-4 , the externally attached rocking frame 6 is mainly composed of hinged lugs 3 , rocking side posts 11 , lateral supports 8 , diagonal supports 9 , steel strands 14 and damper connecting plates 19 . The hinged lugs 3 are welded on the side of the attached rocking frame 6 and correspond to the beam-column node positions of the main steel frame 2 .

The lateral support 8 is connected between the two parallel swinging side columns 11 , and several stiffening ribs 7 are arranged on the lateral support 8 .

The oblique support 9 is a herringbone support, and is fixed on the horizontal support 8 and the swing side column 11 of the next layer through the support connector 10.

The swinging side column 11 is a hollow sandwich steel tube concrete, as shown in FIG. 5 , and is composed of a double-layer steel pipe 131 and a concrete 132. The concrete 132 is filled into the interlayer of the double-layer steel pipe 131. The frame columns are parallel and in a plane. A single column is broken at half of the bottom layer and divided into an upper column 12 and a lower column 13. The lateral supports 8 are all located on the upper column 12, and 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 fixed on 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, and the bottom of the upper column 12 is welded with a rigid bottom plate 16 with a hole. It forms a whole and lays flat on the top of the lower column 13 .

As shown in FIG. 4 , the steel strand 14 is a prestressed steel strand, which is vertically arranged in the cavity of the swinging side column 11 , the top is anchored at the end of the top-layer swinging side column 11 , and the lower part is connected to the foundation 1 through extrusion. The pressure anchoring device 15 is used for anchoring. For the specific extrusion cable structure, refer to the relevant requirements of "Tension-Compression Anchorage Steel Strand Cable JT/T850-2013".

The adjacent externally attached rocking 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 and the lateral supports 8 are the same.

The damper connecting plate 19 is a threaded steel plate and is fixed to the middle of the swing side column 11 on the second floor and above.

A hinged ear plate 3 is fixed to the outside of the beam-column node of the main steel frame 2, and a damper connecting plate 19 is fixed to the middle of the side column of the second floor and above of the steel frame adjacent to the externally attached rocking frame 6.

Rigid connector 4 is used for hinged connection between the rocking side column 11 and the support column on the side of the main steel frame 2. As shown in FIG. The lugs 42 at both ends of the connector 4 are connected with the steel frame 2 and the hinged lugs 3 at both ends of the attached rocker 6, so as to use the attached rocker to control the damage and deformation of the steel frame and improve the seismic performance.

A damper is arranged between the adjacent rigid connecting members 4 of the same externally attached rocking frame 6, and the two ends of the damper are respectively connected with the rocking side column 11 and the supporting column on the side of the main steel frame 2. As shown in FIG. 7, this embodiment The damper 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 rocking frame 6 and the main steel frame 2 through high-strength bolts 20. Located in the horizontal direction, it provides the dissipation capacity for the structure under the action of external loads. The corrugated steel plate damper 18 adopts steel with lower yield point (LYP160, LYP225, Q235, etc.) to provide better energy dissipation capacity and fatigue performance for the damper. During the swinging and lifting process of the externally attached rocking frame 6, the column foot of the beam-column joint is prevented from being subjected to a large force and enters a plastic state. After the earthquake, only the damage damper needs to be replaced to quickly restore the structural function.

The double-layer steel pipe 131 of the swinging side column 11 is made of high-strength steel Q460, and the concrete 132 is UHPC.

The assembling method of the controlled rocking frame raised in the column of the reinforced steel frame structure includes the following steps:

Step 1: A channel is reserved in the lower column 13, the upper part is pre-buried with a steel plate with holes, and the whole is fixed on the foundation 1.

Step 2: The limit plate 17 is placed flush with the side of the lower column 13 and welded on the embedded steel plate.

Step 3: The lateral support 8 is welded on the swing side column 11, and the outer side of the corresponding swing side column 11 is welded with a hinged lug plate 3; the middle section of the swing side column 11 is welded with a damper connecting plate 19 with bolt holes; The herringbone oblique support 9 is welded on the swing side column 11 and the lateral support 8 through the support connector 10; the whole is placed on the pre-embedded bottom plate of the lower column 13 through a rigid bottom plate 16 welded at the bottom of the upper column 12 to form a A rocking frame 6 is attached to the single frame.

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

Step 5: The lugs 42 at both ends of the rigid connecting member 4 cooperate with the rocking side posts 11 and the lugs 42 of the main steel frame 2 through the pins 5 .

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

Step 7: Welding the vertical horizontal support 21 on the swinging side column 11 of the adjacent externally attached rocking frame 6 , thereby realizing the reinforcement connection of the externally attached rocking frame 6 to the main steel frame 2 .

It should be noted that, in this document, 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 relationship between these entities or operations. any such actual relationship or sequence exists. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device that includes a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus.

It should be understood that the above description is for purposes of illustration and not limitation. From reading the above description, many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the preceding claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are incorporated herein by reference for the purpose of being comprehensive. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to disclaim such subject matter, nor should it be considered that the applicant has not considered such subject matter to be part of the disclosed subject matter.

Claims (10)

1. A lifting controlled rocking frame in a column for reinforcing a steel frame structure, characterized in that it comprises a main body steel frame (2) and a multi-column externally attached rocking frame (6); The multiple externally attached rocking frames (6) are arranged on the side of the main steel frame (2), and each externally attached rocking frame (6) includes two rocking side columns (11) and multiple lateral supports (8). (8) Connect the two swinging side columns (11) in the vertical direction, and use rigid connectors (4) to hinge between the swinging side columns (11) and the supporting columns on the side of the main body steel frame (2). The number of externally attached rocking frames (6) on each side of the steel frame (2) is the same as the number of the side support columns of the main steel frame (2); between adjacent rigid connecting pieces (4) of the same externally attached rocking frame (6) A damper is provided, and the two ends of the damper are respectively connected with the rocking side column (11) and the supporting column on the side of the main steel frame (2); longitudinal horizontal supports (21), the number and height of the longitudinal horizontal supports (21) and the horizontal supports (8) are consistent; Each swinging side column (11) is divided into an upper column (12) and a lower column (13), the lateral supports (8) are all located on the upper column (12), and the outer diameter of the lower column (13) is larger than that of the upper column (12). The bottom of the upper column (12) is placed at 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 lower column ( 13) The bottom is fixed on the ground through the foundation (1). 2. The lifting controlled rocking frame in the column of reinforcing steel frame structure according to claim 1, characterized in that the number and height of the beams of the lateral support (8) and the rigid connecting piece (4) and the main steel frame (2) are consistent. 3. The lifting controlled rocking frame for reinforcing the steel frame structure according to claim 1, wherein the rigid connecting piece (4) adopts H-shaped steel (41), and the two ends are provided with lugs (42), and the rocking A hinged lug plate (3) is provided at the position where the side column (11) and the support column are connected to the rigid connecting piece (4), and the lug plate (42) is hinged with the hinged lug plate (3) by a pin shaft (5). 4. The lifting controlled rocking frame in the column for reinforcing the steel frame structure according to claim 1, wherein the damper adopts a corrugated steel plate damper (18), the corrugated steel plate damper (18) is arranged vertically, and the corrugated horizontally. 5. The lifting controlled rocking frame in the column for reinforcing the steel frame structure according to claim 1, wherein 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). 6. The in-column lifting controlled rocking frame for reinforcing a steel frame structure according to claim 5, wherein the top of the upper column (12) is connected with one end of a steel strand (14), and the steel strand (14) starts from the upper section. After the hollow parts of the column (12) and the lower column (13) pass through in sequence, the other end is connected to the foundation (1). 7. The in-column lifting controlled rocking frame for reinforcing a steel frame structure according to claim 5, wherein the concrete in the inner interlayer of the upper column (12) and the lower column (13) is UHPC. 8. The lifting controlled rocking frame in the column of reinforcing steel frame structure according to claim 1, characterized in that, a diagonal support (9) is provided in the middle of the bottom of each lateral support (8), and the diagonal support (9) is a herringbone shape The two ends of the bottom of the oblique support (9) are connected to the two sides of the swinging side columns (11) and the two ends of the horizontal support (8) of the next layer, and the two ends of the bottom of the lowermost oblique support (9) are connected to the lower column (13) on both sides. top. 9. The in-column lifting controlled rocking frame for reinforcing steel frame structures according to claim 1, characterized in that a stiffening rib (7) is provided on the lateral support (8). 10. A method for assembling a controlled rocking frame to be lifted in a column based on any one of the reinforced steel frame structures according to any one of claims 1 to 9, characterized in that, comprising the following steps: Step 1, the bottom of the lower column (13) is fixed on the ground through the foundation (1), and the limit plate (17) is vertically fixed on the top of the lower column (13); In step 2, the lateral support (8) is connected with the upper column (12) of the two swing side columns (11), and the bottom of the upper column (12) is placed at the top center position of the lower column (13), and the bottom of the upper column (12) is located between a plurality of limit plates (17) to form a single externally attached rocking frame (6); In step 3, the supporting column on the side of the main steel frame (2) is hinged with the rigid connecting piece (4) and the damper and the column swinging side column (11) close to it; In step 4, vertical horizontal supports (21) are used to connect the column rocking side posts (11) between adjacent externally attached rocking frames (6).

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