CN107386446A - A kind of beam-column connection and connection method for faced wall pillar cold formed steel structure - Google Patents

Abstract

The invention discloses a beam-column connection node and a connection method for a composite wall-column type cold-formed steel structure. The ends of the adjacent upper and lower square concrete-filled steel tube columns are fixedly connected with the upper joint plate, lower joint plate and splicing pieces arranged on the same side of the square concrete-filled steel tube column. The connecting screw and the connecting bolt are fixedly connected with the upper gusset plate and the lower gusset plate, and the steel casing is post-grouted after the joint connection is completed. The connection node not only ensures the effective connection of the upper and lower floors of the cold-formed steel structure, but also achieves the purpose of layered assembly of the structure, which is conducive to the formation of modular prefabricated assembly technology for the room and reduces the construction difficulty. And the floor slab is connected with each other through the cross tie rod and the gusset plate, which further improves the integrity of the structure. At the same time, the connection method is easy to construct.

Description

A beam-column joint and connection for composite wall-column cold-formed steel structures method

technical field

The invention relates to a building structure, in particular to a beam-column connection node and a connection method for a composite wall-column cold-formed steel structure.

Background technique

Due to the large population, tight land resources, and severe earthquake disasters, it is more in line with my country's national conditions to develop energy-saving, environmentally friendly, and highly industrialized cold-formed steel structures from low-rise to multi-layer. It is also an effective way to accelerate the industrialization and prefabrication of housing. However, the existing low-rise cold-formed steel structure cannot be directly applied to multi-storey residential buildings. At present, there is an urgent need to solve technical problems such as more stringent structural vertical load-bearing, shear resistance, and overturning resistance brought about by the development of cold-formed steel structures from low-rise to multi-storey. .

The cold-formed steel house is a "box" structure composed of composite wall panels. The vertical bearing capacity and lateral resistance level of the wall directly determine the safety performance of the structure. Under the action of strong earthquakes, as the only effective anti-side member of the cold-formed steel structure, once the wall is damaged, the structure has no redundant force transmission path for fortification, and the structure may collapse locally or even collapse as a whole.

The beam-column joints of the existing combined wall-column cold-formed steel structure are difficult to achieve the purpose of layered assembly of the structure, which is not conducive to the formation of room modular prefabrication assembly technology, and for the combined wall-column cold-formed steel structure, how to It is an urgent problem to be solved at present to ensure the effective connection between the square concrete filled steel tube continuous column, the internal wall element and the floor. Therefore, there is an urgent need for a beam-column connection node that is easy to manufacture, easy to construct, and has good structural integrity, so as to promote the popularization and application of the combined wall-column cold-formed steel building structure system.

Contents of the invention

Purpose of the invention: In order to solve the deficiencies in the prior art, provide a beam-column connection node for composite wall-column cold-formed steel structures, which can ensure the connection between the square concrete-filled steel tube continuous columns, internal wall elements and floor slabs. Effective connection can achieve the purpose of layered assembly of the structure, which is conducive to the formation of room modular prefabrication assembly technology. At the same time, a connection method is also provided, which is easy to construct.

Technical scheme: in order to solve the above technical problems, the technical scheme adopted in the present invention is:

A beam-column connection node for a combined wall-column cold-formed steel structure, the connection node comprising a steel sleeve, an upper gusset plate, a lower gusset plate and splices;

Bolt holes are reserved at the splicing position of the steel casing and the square concrete-filled steel tube column, and the two ends of the steel casing are respectively embedded in the lower end of the adjacent upper square concrete-filled steel pipe column and the upper end of the lower square concrete-filled steel pipe column, and the steel casing The square concrete-filled steel tube column is fixedly connected with the upper joint plate, lower joint plate and splicing pieces arranged on the same side of the square steel tube concrete column through tension bolts;

The splicing piece is arranged between the upper and lower flanges of the I-shaped beam, and its lower part is fixedly connected with the lower flange of the I-shaped beam, the web plate and the lower gusset plate of the top guide beam of the lower wall through connecting bolts. The top guide beam of the wall is located under the I-shaped beam, and the lower gusset plate is located under the top guide beam of the lower wall; the upper part is sequentially connected with the upper flange of the I-shaped beam, the ALC floor, and the bottom guide beam of the upper wall through the connecting screw The web plate and the upper gusset plate are fixedly connected, the bottom guide beam of the upper wall is located below the upper gusset plate, and the ALC floor is located below the bottom guide beam of the upper wall and above the upper flange of the I-shaped beam.

Further, the steel casing is formed by face-to-face spot welding of two curled C-shaped steels with a thickness not less than 4mm. The cross-sectional area of the steel casing is equal to the cross-sectional area of the concrete inside the square steel pipe concrete column. The length is greater than or equal to 1.0m, bolt holes are provided on the two butt joint surfaces, grouting holes are reserved on one of the other two surfaces, and the corresponding grouting holes are also provided on the corresponding upper square concrete-filled steel tube columns holes for post-grouting after the joint connection is complete.

Further, the upper gusset plate and the lower gusset plate are welded L-shaped steel with a stiffening plate inside, and reserved holes are set on the stiffening plate so that the cross tie rods in the internal wall elements can be connected with the upper gusset plate and the lower gusset plate .

Further, the splicing piece is a channel steel with a sealing plate at the end, bolt holes are reserved at the splicing position of the first sealing plate and the square steel tube concrete column, and the thickness of the upper gusset plate, the lower gusset plate and the splicing piece is greater than or equal to 4mm.

A connection method using the above-mentioned beam-column connection node for a combined wall-column cold-formed steel structure, the method includes the following steps:

Step 1: Insert the two ends of the steel sleeve into the lower end of the upper square concrete-filled steel tube column and the upper end of the lower square concrete-filled steel tube column respectively, and use pull bolts to fix the steel sleeve, square steel tube concrete column and the lower gusset plate. ;

Step 2: Set the top guide beam of the lower wall on the upper part of the lower gusset plate, set the I-shaped beam on the upper part of the top guide beam of the lower wall, insert splicing pieces between the upper and lower flanges of the I-shaped beam, and use pull bolts The sealing plate of the splicing piece is fixedly connected with the square steel tube concrete column, and the lower part of the splicing piece, the lower flange of the I-shaped beam, the web plate of the top guide beam of the lower wall and the lower gusset plate are fixedly connected by connecting bolts; One end of the cross tie rod is aligned with the reserved hole on the stiffener plate of the lower gusset plate and fixedly connected with the lower gusset plate by bolts;

Step 3: Install the ALC floor slab on the top flange of the I-shaped beam, set the bottom guide beam of the upper wall on the top of the ALC floor, and embed the upper gusset plate between the flanges of the bottom guide beam of the upper wall, using The steel casing, the square concrete-filled steel tube column and the upper gusset plate are fixedly connected by the pull bolts, and the upper gusset plate, the web of the bottom guide beam of the upper wall, the ALC floor slab, and the top flange of the I-shaped beam are spliced together by connecting screws. The upper part of the joint is fixedly connected; the other end of the cross tie rod is aligned with the reserved hole on the stiffener plate of the upper gusset plate, and then the bolt is fixedly connected with the upper gusset plate; the upper gusset plate and the lower gusset plate connected by each cross tie rod are located at Diagonal ends of the wall;

Step 4: Use high-strength mortar to post-grout the steel casing. The compressive strength of the high-strength mortar is not lower than the compressive strength of the concrete inside the square steel tube concrete column.

Preferably, when the square concrete-filled steel tube column and the two I-shaped beams connected with the square concrete-filled steel tube column are in the same plane, the two I-shaped beams are symmetrically arranged on both sides of the square steel tube concrete column, and the square steel tube concrete-filled column Set and install a connection node between each I-beam.

Preferably, when the square steel pipe concrete column and the two I-shaped beams connected to the square steel pipe concrete column are not in the same plane, the two I-shaped beams are arranged on both sides of the square steel pipe concrete column, and the square steel pipe concrete A connection node is provided between the concrete column and each I-beam.

Beneficial effects: compared with the prior art, the technical solution of the present invention has the following advantages:

(1) The steel casing used in the beam-column connection node of the composite wall-column type cold-formed steel structure of the present invention has ensured the vertical continuity of the upper and lower square concrete-filled steel tube columns of the structure, and the upper joint plate and the lower joint plate The joints and splices improve the connection performance of the members on both sides of the square steel tube concrete column, enhance the integrity of the structure, and thus improve the lateral stiffness and bearing capacity of the structure.

(2) The steel sleeves, upper gusset plate, lower gusset plate and splicing pieces in the beam-column connection node of the combined wall-column type cold-formed steel structure of the present invention are all prefabricated in the factory, and only assembly work is carried out on site , the process is simple, and the construction speed is fast; the square concrete filled steel tube continuous column, the internal wall element and the floor slab are mutually tied by cross tie rods and gusset plates, which further improves the integrity of the structure. In addition, the present invention uses welded and formed steel sleeves, upper gusset plates, lower gusset plates and splices as nodes to connect the I-shaped beams and square steel tube concrete columns of the combined wall-column cold-formed steel structure system, which is convenient for manufacture, It has the advantages of good structural integrity and simple construction.

(3) The beam-column connecting node for the combined wall-column cold-formed steel structure of the present invention can achieve the purpose of layered assembly of the structure, which is conducive to the formation of room modular prefabrication assembly technology.

Description of drawings

Fig. 1 is the structural representation of connection node among the present invention;

Fig. 2 is the structural representation of the steel casing in the connection node of the present invention;

Fig. 3 is the structural representation of gusset plate in the connection node of the present invention;

Fig. 4 is a schematic structural view of the splicing piece in the connection node of the present invention;

Fig. 5 is a schematic diagram of the installation process of the connection node of the present invention connected to the square steel pipe concrete column and the I-shaped beam;

Fig. 6 is the structural schematic diagram that the connection point of the present invention is connected with the square steel pipe concrete column, the I-shaped beam and the floor slab;

Fig. 7 is a kind of structural schematic diagram that connection node is connected with square steel tube concrete column and I-beam among the present invention;

Fig. 8 is a schematic diagram of the overall structure of a connection point connected to a square steel tube concrete column and an I-shaped beam in the present invention;

Fig. 9 is another schematic diagram of the connection between the connection node and the square steel pipe concrete column and the I-shaped beam in the present invention.

detailed description

The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

As shown in FIG. 1 , a beam-to-column connection node for composite wall-to-column cold-formed steel structures according to the present invention includes a steel casing 1 , an upper gusset plate 2 , a lower gusset plate 3 and splicing pieces 4 . The square concrete-filled steel pipe column 5 includes an upper square concrete-filled steel pipe column 51 and a lower square concrete-filled steel pipe column 52. There are grouting holes 501 on the upper square concrete-filled steel pipe column, and bolt holes are reserved for the splicing positions of the upper square concrete-filled steel pipe column and the lower square concrete-filled steel pipe column with the steel casing 1; The upper gusset plate, lower gusset plate and splicing pieces on the same side of the square steel tube concrete column are fixedly connected by pull bolts 6; The lower flange of the beam, the web of the top guide beam 9 of the lower wall and the lower gusset plate are fixedly connected, the top guide beam of the lower wall is located below the lower flange of the I-shaped beam, and the lower gusset plate is located at the top guide of the lower wall. Below the beam; the upper part of the splicing piece is fixedly connected with the upper flange of the I-shaped beam, the ALC floor 11, the web of the upper wall bottom guide beam 12 and the upper gusset plate through the connecting screw 10, and the upper wall bottom guide beam Located below the upper gusset plate, the ALC floor is located below the bottom guide beam of the upper wall and above the upper flange of the I-shaped beam. The cross tie rod 13 is fixedly connected with the upper gusset plate or the lower gusset plate.

As shown in Figure 2, the steel casing is formed by face-to-face spot welding of two curled C-shaped steels 14 with a thickness not less than 4mm. The cross-sectional area of the steel casing is equal to the cross-sectional area of the concrete inside the square steel pipe concrete column. The length is greater than or equal to 1.0m. Six groups of bolt holes 101 are respectively provided on the two butt joint surfaces, and grouting holes 102 are reserved on one surface of the other two surfaces, which match with the grouting holes 501 on the square concrete-filled steel tube column on the upper floor, so as to facilitate the completion of node connection Post-grouting.

As shown in Figure 3, the upper gusset plate and the lower gusset plate are welded L-shaped steel with stiffening plate 21 inside. Divided into two parts, each part is provided with a set of bolt holes 201 on the vertical and horizontal planes; a reserved hole 202 is provided on the stiffening plate near the center of the hypotenuse to facilitate cross tie rods in the internal wall element 15 and the upper gusset plate and lower gusset tie.

As shown in Figure 4, the splicing piece is a channel steel with a sealing plate at the end, and the sealing plate includes a first sealing plate 41 and a second sealing plate 42, the splicing position of the first sealing plate and the square steel pipe concrete column, and the channel steel A group of bolt holes 401 are arranged on the upper and lower flange surfaces of the groove, and two groups of bolt holes 402 are arranged on the bottom surface of the groove. The purpose of setting the first sealing plate (closer to the end of the square CFST column) on the splicing piece is to connect with the square CFST column, and the purpose of setting the second sealing plate (farther from the end of the square CFST column) on the splicing piece is to transfer part of the shear. force to avoid the formation of weak areas at the lower end of the stiffener.

Further, the thickness of the upper gusset plate, the lower gusset plate and the joint piece is greater than or equal to 4mm.

As shown in Figures 5 to 9, the above-mentioned connection method for the beam-column connection node of the composite wall-column cold-formed steel structure includes the following steps:

Step 1: After inserting the two ends of the steel casing into the lower end of the upper square concrete-filled steel pipe column and the upper end of the lower square concrete-filled steel pipe column, connect the grouting holes on the steel casing with the grouting holes on the upper square concrete-filled steel pipe column. Correspondingly, the bolt holes on the steel casing correspond to the bolt holes reserved on the upper square concrete-filled steel pipe column and the lower square concrete-filled steel pipe column, and the bolt holes on the vertical surface of the lower gusset plate. The pipe, the lower square concrete-filled steel tube column and the lower gusset plate are fixedly connected.

Step 2: Set the top guide beam of the lower wall on the upper part of the lower gusset plate, set the I-shaped beam on the upper part of the top guide beam of the lower wall, and insert splices between the upper and lower flanges on both sides of the I-shaped beam web , the first sealing plate of the splicing piece is fixedly connected with the square concrete-filled steel tube column by means of tension bolts, and the lower part of the splicing piece, the lower flange of the I-shaped beam, the web of the top guide beam of the lower wall and the The lower gusset plate is fixedly connected, the groove bottom surface of the splice is fixedly connected with the web of the I-shaped beam; the web of the top guide beam of the lower wall is located under the I-shaped beam, and the lower gusset plate is located at the web of the top guide beam of the lower wall The lower part of the plate; align one end of the cross tie rod with the reserved hole on the stiffened plate, and then use bolts to fix it with the lower gusset plate.

Step 3: Install the ALC floor slab on the top of the I-shaped beam. After setting the bottom guide beam of the upper wall on the top of the ALC floor, embed the upper gusset plate between the flanges of the bottom guide beam of the upper wall, and use pull bolts The steel casing, the upper square concrete-filled steel tube column and the upper gusset plate are fixedly connected, and the upper gusset plate, the web plate of the bottom guide beam of the upper wall, the ALC floor slab, the upper flange of the I-shaped beam and the splicing parts are fixedly connected by connecting screws. The upper part is fixedly connected; the bottom guide beam of the upper wall is located under the upper gusset plate, and the ALC floor is located under the bottom guide beam of the upper wall; align the other end of the cross tie rod with the reserved hole on the stiffening plate and use bolts to connect with the upper joint The plate is fixedly connected; wherein, the upper gusset plate and the lower gusset plate connected by each cross tie rod are located at both ends of the diagonal line of the wall.

Step 4: Use high-strength mortar 16 to post-grout the steel casing from the grouting hole reserved on the steel casing. The compressive strength of the high-strength mortar is not lower than the compressive strength of the concrete inside the square steel tube concrete column.

In the above connection method, as shown in Figure 7, when the square CFST column and the two I-shaped beams connected with the square CFST column are in the same plane, the two I-shaped beams are symmetrically arranged on the square CFST column On both sides of the column, a connection node is installed between the square steel pipe concrete column and each I-shaped beam. The spliced image is shown in Figure 8.

As shown in Figure 9, when the square CFST column and the two I-shaped beams connected to the square CFST column are not in the same plane, the two I-shaped beams are arranged on the adjacent sides of the square CFST column, A connection node is installed between the square concrete filled steel tube column and each I-beam.

As a preference, in order to ensure the connection performance of the beam-column joints, the specifications of the tension bolts between the square concrete-filled steel tube column and the upper gusset plate, the lower gusset plate and the splicing parts shall not be less than M10; The specifications of the connecting screw and connecting bolt between the I-shaped beams are not less than M8. The geometric dimensions of the upper gusset plate and the lower gusset plate are the same, the length of which is not greater than 400mm, the width is the width of the flange of the I-shaped beam, and the height is not greater than 400mm. The length of the joint is equal to the length of the upper or lower gusset plate, the width of the joint is half of the net value after subtracting the thickness of the web from the width of the I-shaped beam flange, and the height of the joint is the height of the web of the I-shaped beam minus the upper and lower wings Net value after edge thickness.

In traditional low-rise cold-formed steel structures, the beams and columns are mainly uniaxially symmetrical C-shaped or U-shaped steel members, and the beams and columns are often connected by screws that are not conducive to the seismic resistance of the overall structure. And the square concrete-filled steel tube column and the I-shaped beam in the application of the present invention are all biaxially symmetrical members, and the square concrete-filled steel tube column is connected with the I-shaped beam by the upper gusset plate, the lower gusset plate and the splicing pieces to form a whole, which can effectively improve the The connection performance of the members on both sides of the square steel tube concrete column enhances the integrity of the structure. At the same time, the splices connect the ALC floor, the I-shaped beam, the bottom guide beam of the upper wall and the top guide beam of the lower wall with the upper gusset plate and the lower gusset plate through connecting screws and bolts, which further improves the quality of the upper and lower walls. body continuity.

The connection node applied in the invention is convenient for popularization and application of the combined wall-column multilayer cold-formed steel building structure system. This node has the advantages of simple construction, transferable bending moment, and good structural integrity. At the same time, it can achieve the purpose of layered assembly of the structure, which is conducive to the formation of room modular prefabrication assembly technology.

Claims (7)

1. A beam-column connection node for composite wall-column type cold-formed steel structures, characterized in that: the connection node comprises steel casing (1), upper gusset plate (2), lower gusset plate (3) and Splicing pieces (4); Bolt holes are reserved at the splicing positions of the steel casing and the square concrete-filled steel pipe column (5), and the two ends of the steel casing are respectively embedded in the lower end of the adjacent upper square concrete-filled steel pipe column (51) and the lower square concrete-filled steel pipe column ( 52), the steel casing and the square concrete-filled steel tube column are fixedly connected with the upper joint plate, the lower joint plate and the splicing pieces arranged on the same side of the square steel tube concrete column through the tension bolts (6); The splicing piece is arranged between the upper and lower flanges of the I-shaped beam (7), and its lower part is sequentially connected with the lower flange of the I-shaped beam and the web of the top guide beam (9) of the lower wall through the connecting bolts (8). The plate and the lower gusset plate are fixedly connected, the top guide beam of the lower wall is located under the I-shaped beam, and the lower gusset plate is located under the top guide beam of the lower wall; The flange, the ALC floor (11), the web of the upper wall bottom guide beam (12) and the upper gusset plate are fixedly connected, the upper wall bottom guide beam is located below the upper gusset plate, and the ALC floor is located at the upper wall bottom guide beam below and above the top flange of the I-beam. 2. The beam-to-column connection node for composite wall-column cold-formed steel structure according to claim 1, characterized in that: the steel casing consists of two crimped C-shaped steels (14mm) with a thickness not less than 4mm ) face-to-face spot welding, the cross-sectional area of the steel casing is equal to the cross-sectional area of the concrete inside the square steel pipe concrete column, the length of the steel casing is greater than or equal to 1.0m, and bolt holes are provided on both butt-joining surfaces. A grouting hole (102) is reserved on the upper end of one of the two faces, and the corresponding upper square concrete-filled steel tube column is also provided with a corresponding grouting hole so as to facilitate post-grouting after the node connection is completed. 3. The beam-column connection node for combined wall-column cold-formed steel structure according to claim 1, characterized in that: the upper gusset plate and the lower gusset plate are internally provided with stiffening plates (21) L-shaped steel is welded, and reserved holes are set on the stiffening plate so that the cross tie rod (13) in the internal wall element (15) can be tied with the upper gusset plate and the lower gusset plate. 4. The beam-to-column connection node for combined wall-column cold-formed steel structure according to claim 1, characterized in that: the splicing piece is a channel steel with a sealing plate at the end, and the first sealing plate and Bolt holes are reserved at the splicing position of the square concrete-filled steel tube column, and the thickness of the upper gusset plate, lower gusset plate and splicing pieces is greater than or equal to 4mm. 5. A connection method utilizing any one of claims 1 to 4 for a beam-column connection node of a composite wall-column type cold-formed steel structure, characterized in that the method comprises the following steps: Step 1: Insert the two ends of the steel sleeve into the lower end of the upper square concrete-filled steel tube column and the upper end of the lower square concrete-filled steel tube column respectively, and use pull bolts to fix the steel sleeve, square steel tube concrete column and the lower gusset plate. ; Step 2: Set the top guide beam of the lower wall on the upper part of the lower gusset plate, set the I-shaped beam on the upper part of the top guide beam of the lower wall, insert splicing pieces between the upper and lower flanges of the I-shaped beam, and use pull bolts The sealing plate of the splicing piece is fixedly connected with the square steel tube concrete column, and the lower part of the splicing piece, the lower flange of the I-shaped beam, the web plate of the top guide beam of the lower wall and the lower gusset plate are fixedly connected by connecting bolts; One end of the cross tie rod is aligned with the reserved hole on the stiffener plate of the lower gusset plate and fixedly connected with the lower gusset plate by bolts; Step 3: Install the ALC floor slab on the top flange of the I-shaped beam, set the bottom guide beam of the upper wall on the top of the ALC floor, and embed the upper gusset plate between the flanges of the bottom guide beam of the upper wall, using The steel casing, the square concrete-filled steel tube column and the upper gusset plate are fixedly connected by the pull bolts, and the upper gusset plate, the web of the bottom guide beam of the upper wall, the ALC floor slab, and the top flange of the I-shaped beam are spliced together by connecting screws. The upper part of the joint is fixedly connected; the other end of the cross tie rod is aligned with the reserved hole on the stiffener plate of the upper gusset plate, and then the bolt is fixedly connected with the upper gusset plate; the upper gusset plate and the lower gusset plate connected by each cross tie rod are located at Diagonal ends of the wall; Step 4: post-grouting the steel casing with high-strength mortar (16), the compressive strength of the high-strength mortar is not lower than the compressive strength of the concrete inside the square steel tube concrete column. 6. The connection method for the beam-column connection node of the combined wall-column type cold-formed steel structure according to claim 5, characterized in that: when the square steel tube concrete column and the two I-shaped steel tube concrete columns are connected When the beams are all in the same plane, two I-shaped beams are arranged symmetrically on both sides of the square CFST column, and a connection node is installed between the square CFST column and each I-shaped beam. 7. The connection method for the beam-column connection node of the composite wall-column type cold-formed steel structure according to claim 5, characterized in that: when the square steel tube concrete column and the two I-shaped steel tube concrete columns are connected When the beams are not in the same plane, two I-shaped beams are arranged on the adjacent sides of the square concrete-filled steel tube column, and a connection node is installed between the square steel tube concrete column and each I-shaped beam.