Steel beam web plate rectangular hole reinforcing structure reinforced by profile steel

Abstract

The utility model discloses a steel beam web plate rectangular hole reinforcing structure reinforced by profile steel. The steel beam is mainly composed of an upper flange, a lower flange and a web plate, the web plate is connected between the upper flange and the lower flange, a rectangular hole is formed in the middle of the web plate, a reinforcing unit is arranged at the rectangular hole of the web plate, and the two pieces of vertical angle steel are symmetrically arranged on the left side and the right side of the rectangular hole respectively. The two pieces of horizontal angle steel are symmetrically arranged on the upper side and the lower side of the rectangular hole respectively, the vertical angle steel and the horizontal angle steel are welded to form a square-shaped extending structure in a surrounding mode, and the vertical angle steel / the horizontal angle steel is connected through steel beam webs in a welding seam or bolt or bolt-welding mixed mode. Through the square-shaped extension structure formed by the vertical angle steel and the horizontal angle steel, the bending resistance and the shearing resistance of the web perforated beam section can be effectively improved, and the welding residual stress and the deformation of the web are reduced; and factory prefabrication can be achieved, the welding workload can be greatly reduced, construction is easy and rapid, and performance is excellent.

Description

Technical Field

[0001] The utility model relates to the field of structural measures for steel structures, in particular to a steel beam web reinforcement structure with rectangular holes strengthened by using section steel. Background Art

[0002] There are many equipment pipelines in high-rise buildings (water supply and drainage, electricity, HVAC, fire protection, etc.). When the pipeline crosses the beam grid, if the pipeline is arranged at the bottom of the steel beam, it will seriously affect the net floor height of the building, which is not conducive to the full utilization of the structural space. In order to solve this problem, the common method is to preset the pipeline hole in the web of the steel beam and arrange the pipeline within the height range of the steel beam. When there is a web opening, the bearing capacity and stiffness of the opening beam section will inevitably be weakened, which will have an adverse effect on the bearing capacity and deformation control of the steel beam. my country's "Steel Structure Design Code (GB50017-2017)" and "Technical Code for Steel Structure of High-rise Civil Buildings (JGJ99-2015)" require the method of welding longitudinal and transverse stiffening ribs at the edge of the hole to strengthen the web opening steel beam. According to the requirements of the specification, the welding workload of the stiffening ribs used for strengthening is large (for example, double-sided stiffening may require 16 plates to be welded to the web), and welding is prone to cause residual deformation of the web, so the actual engineering application brings many difficulties. The analysis shows that the main function of the existing standard reinforcement method is to strengthen the bending performance of the opening section. Since the reinforcement plate has no vertical plate, it has basically no effect on the shear capacity of the opening section.

[0003] In actual engineering, the column and the main beam are generally connected by rigid connection. When the steel beam (or composite beam) and the steel column are connected by rigid connection, there is a negative moment zone at the beam end, and the lower flange of the steel beam is compressed in this area. Since the lower flange of the steel beam has no lateral constraints, it is prone to out-of-plane instability, which is the distortion buckling of the section for the entire section. In order to prevent distortion buckling in the negative moment zone of the steel beam, my country's "Code for Design of Steel Structures (GB50017-2017)" requires the installation of horizontal corner braces or transverse stiffeners. Utility Model Content

[0004] In order to solve the problems existing in the background technology, the purpose of the utility model is to provide a steel beam web reinforcement structure with rectangular holes reinforced by steel sections, which can effectively improve the weakening of the bending and shear bearing capacity and stiffness of the steel beam section caused by the web openings.

[0005] The technical solution adopted by the utility model is as follows:

[0006] The reinforcement structure includes a steel beam and a reinforcement unit; the steel beam is mainly composed of an upper flange, a lower flange and a web, the upper flange and the lower flange are arranged in parallel, and the web is connected between the upper flange and the lower flange; a rectangular hole is opened in the middle of the web, and a reinforcement unit is arranged at the rectangular hole of the web.

[0007] The reinforcement unit includes two vertical steel sections and two horizontal steel sections; the two vertical steel sections are symmetrically arranged on the left and right sides of the rectangular hole, and the vertical steel sections are arranged along the height direction of the steel beam; the two horizontal steel sections are symmetrically arranged on the upper and lower sides of the rectangular hole, and the horizontal steel sections are arranged along the length direction of the steel beam; the vertical steel sections and the horizontal steel sections are arranged vertically, and after being welded, the vertical steel sections and the horizontal steel sections form a "mouth" shaped structure, and the horizontal steel sections extend from the upper and lower sides of the vertical steel sections.

[0008] The upper and lower ends of the vertical steel section respectively extend to the upper flange and the lower flange of the steel beam, the upper end and the lower end of the vertical steel section are respectively welded to the upper flange and the lower flange of the steel beam through flange welds, one limb of the vertical steel section is fixedly connected to the web through a vertical weld or a vertical bolt, and the plane where the other limb of the vertical steel section is located is perpendicular to the web;

[0009] One limb of the horizontal steel section is fixedly connected to the web through a horizontal weld or a horizontal bolt, and the plane where the other limb of the horizontal steel section is located is perpendicular to the web.

[0010] The left and right ends of the horizontal steel section are respectively welded to two vertical steel sections.

[0011] The reinforcing unit is arranged on one side or both sides of the rectangular hole of the web.

[0012] The two reinforcement units arranged on both sides are symmetrically connected to the two side walls of the web.

[0013] The left and right ends of the horizontal steel section extend out of the rectangular hole by equal distances respectively.

[0014] The vertical steel sections are angle steels or channel steels, and the horizontal steel sections are angle steels.

[0015] When the vertical steel section adopts channel steel, the web of the channel steel is fixedly connected to the web of the steel beam (that is, the web of the channel steel is parallel to the web of the steel beam), and the plane where the flange plate of the channel steel is located is perpendicular to the web of the steel beam.

[0016] When the vertical steel is channel steel, a flange plate of the channel steel is fixedly connected to the web of the steel beam (ie, the flange plate of the channel steel is parallel to the web of the steel beam), and the plane where the web of the channel steel is located is perpendicular to the web of the steel beam.

[0017] The design principle of the utility model is:

[0018] 1. When calculating the bending capacity of the section, follow the principle that the bending capacity of the strengthened section is not less than that of the section without holes, and determine the area of ​​the horizontal angle steel. When calculating the shear capacity of the section, ensure that the sum of the areas of the horizontal angle steel parallel to the web is not less than the area of ​​the rectangular hole in the web of the steel beam to ensure the shear capacity of the strengthened section. Through the above measures, ensure that the bending and shear capacity at the section with holes is not less than that of the section without holes.

[0019] 2. When calculating the local stability of the open section, consider that the local stability bearing capacity of each area of ​​the steel beam web is not less than that of the web of the beam without openings under the constraints of horizontal angle steel and vertical angle steel (or channel steel).

[0020] 3. When calculating the stiffness of the opening section, consider the contribution of the "U"-shaped frame structure composed of horizontal angle steels and vertical angle steels (or channel steels) at the opening section to the stiffness, and try to minimize the impact of the web opening on the weakening of the steel beam stiffness.

[0021] Under the action of bending moment, the bending bearing capacity of the opening section is compensated by the couple formed by the tensile and compressive forces of the horizontal angle steels set above and below the opening. The horizontal angle steel is transmitted to the entire section through the connection with the web and the vertical angle steels (or channel steels) connected at both ends; under the action of shear force, the shear resistance of the tic-tac-toe structure composed of the horizontal angle steels and the vertical angle steels (or channel steels) at both ends is used to supplement the weakened shear bearing capacity of the opening section; at the opening section, the supporting role of the horizontal angle steels and the vertical angle steels (or channel steels) improves the local stability of the web of the steel beam; in the negative bending area of ​​the beam, the vertical angle steel (or channel steel) can prevent the section from distortion and buckling, and the horizontal angle steel can effectively improve the axial tensile and compressive resistance of the "inverted T-shaped" structure of the opening section.

[0022] The height of the rectangular hole in the web is not less than 0.7 times the beam height (steel beam) or 0.8 times the steel beam height (steel-concrete composite beam).

[0023] The horizontal angle steel and the vertical angle steel (channel steel) can be arranged on one side or both sides of the web; when arranged on both sides, the reinforcement structure should be arranged symmetrically on both sides of the web.

[0024] The horizontal angle steel and vertical angle steel (channel steel) should be in the same plane when in contact with the web of the steel beam. The vertical angle steel (channel steel) should not exceed the edge of the steel beam flange in the direction perpendicular to the web of the steel beam; the horizontal limb width of the horizontal angle steel should not exceed the width of the vertical angle steel (or channel steel) in the direction perpendicular to the web of the steel beam.

[0025] The two ends of the horizontal angle steel are welded to the vertical angle steel (or channel steel) to form a "tic-tac-toe structure", that is, a "mouth"-shaped extended structure. The upper and lower ends of the vertical angle steel (or channel steel) are welded to the flange of the steel beam, and can be connected to the web of the steel beam by welds, bolts or bolt welding. The horizontal angle steel and the web of the steel beam can be connected by welds, bolts or bolt welding. When bolts are used, the number of bolts should not be less than 3.

[0026] The utility model can effectively improve the bending and shear bearing capacity of the web opening beam section through the "mouth" shaped extension structure composed of vertical angle steels (or channel steels) and horizontal angle steels.

[0027] Compared with the existing reinforcement method, the number of components used in the utility model is greatly reduced. When double-sided setting is performed, the utility model requires 8 sections of stiffening steel, while the traditional method requires 16 stiffening ribs. Due to the reduction in the number of stiffening ribs, the welding workload of the utility model is greatly reduced, which can effectively reduce the residual stress and welding deformation caused by welding on thin webs. The horizontal angle steel of the utility model can be connected to the web of the beam by bolts, and the bolts can also be used as positioning bolts during production, which is convenient for production and processing.

[0028] The horizontal angle steel and vertical angle steel (channel steel) used in the utility model are used as stiffening components, which can greatly improve the bending and shearing performance of the opening section. The traditional method cannot make up for the area loss of the web of the opening section, and the improvement of the shear bearing capacity is limited; when the web opening is located in the negative bending moment area of ​​the steel beam, the vertical angle steel (or channel steel) can be used to prevent the out-of-plane instability of the lower flange of the steel beam (i.e., the distortion buckling of the section). The utility model can be prefabricated in the factory, which can greatly reduce the welding workload, and the construction is simple and fast, and the performance is excellent.

[0029] The beneficial effects of the utility model are:

[0030] 1. In terms of stress performance, the reinforcement method adopted by the utility model can significantly improve the bending and shear bearing capacity and rigidity of the web opening steel beam.

[0031] 2. The utility model adopts a small number of stiffening components, which can effectively reduce the processing and manufacturing workload, reduce the welding workload of stiffening components and steel beam webs, and reduce welding residual stress and residual deformation.

[0032] 3. When the opening section is located in the negative bending moment zone of the steel beam, the vertical angle steel (channel steel) can also be used to prevent the distortion and buckling of the steel beam section.

[0033] 4. The reinforcement method of the utility model is simple and fast to construct and the quality is controllable. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the reinforcement structure when the utility model adopts weld welding;

[0035] Figure 2 This is a schematic diagram of the reinforcement structure when the utility model is connected by bolts;

[0036] Figure 3 Schematic diagrams of reinforcement structures of different stiffening component connection forms; among them, (a) is a schematic diagram of the reinforcement structure of the first connection form; (b) is a schematic diagram of the reinforcement structure of the second connection form; (c) is a schematic diagram of the reinforcement structure of the third connection form; (d) is a schematic diagram of the reinforcement structure of the fourth connection form; (e) is a schematic diagram of the reinforcement structure of the fifth connection form; (f) is a schematic diagram of the reinforcement structure of the sixth connection form; (g) is a schematic diagram of the reinforcement structure of the seventh connection form; (h) is a schematic diagram of the reinforcement structure of the eighth connection form; (j) is a schematic diagram of the reinforcement structure of the ninth connection form; (k) is a schematic diagram of the reinforcement structure of the tenth connection form; (m) is a schematic diagram of the reinforcement structure of the eleventh connection form; (n) is a schematic diagram of the reinforcement structure of the twelfth connection form;

[0037] Figure 4 It is a schematic diagram of the stiffening rib installation process;

[0038] In the figure: 1. Steel beam; 2. Upper flange; 3. Lower flange; 4. Web; 5. Rectangular hole; 6. Vertical steel section; 7. Horizontal steel section; 8. Horizontal bolt; 9. Horizontal weld; 10. Vertical weld; 11. Vertical bolt; 12. Flange weld. DETAILED DESCRIPTION

[0039] The present invention is described in detail below in conjunction with specific implementation cases. The following implementation cases will help those skilled in the art to further understand the present invention, but will not limit the present invention in any form.

[0040] like Figure 1 and Figure 2 As shown, the reinforcement structure includes a steel beam 1 and a reinforcement unit; the steel beam 1 is mainly composed of an upper flange 2, a lower flange 3 and a web 4, the upper flange 2 and the lower flange 3 are arranged in parallel, the upper flange 2 is located above the lower flange 3, and the web 4 is vertically connected between the upper flange 2 and the lower flange 3; a rectangular hole 5 is opened in the middle of the web 4, the rectangular hole 5 does not extend to the flanges 2 and 3 on both sides, and a reinforcement unit is provided at the rectangular hole 5 of the web 4.

[0041] The reinforcement unit includes two vertical steel sections 6 and two horizontal steel sections 7.

[0042] The two vertical steel sections 6 are symmetrically arranged on the left and right sides of the rectangular hole 5, and the vertical steel sections 6 are arranged along the height direction of the steel beam 1. The two horizontal steel sections 7 are symmetrically arranged on the upper and lower sides of the rectangular hole 5, and the horizontal steel sections 7 are arranged along the length direction of the steel beam 1. The vertical steel sections 6 and the horizontal steel sections 7 are arranged vertically. After welding, the vertical steel sections 6 and the horizontal steel sections 7 form a sealed "mouth"-shaped extension structure, and the horizontal steel sections 7 extend from the upper and lower sides of the vertical steel sections 6.

[0043] In a specific implementation, the steel beam 1 is an H-shaped steel beam or an I-shaped steel beam.

[0044] The upper and lower ends of the vertical steel section 6 extend to the upper flange 2 and the lower flange 3 of the steel beam 1 respectively, and the upper and lower ends of the vertical steel section 6 are respectively welded to the upper flange 2 and the lower flange 3 of the steel beam 1 through flange welds 12, and one limb of the vertical steel section 6 is fixedly connected to the web 4 through a vertical bolt-weld mixed mode, a vertical weld 10 or a vertical bolt 11, and the plane where the other limb of the vertical steel section 6 is located is perpendicular to the web 4;

[0045] One leg of the horizontal steel section 7 is fixedly connected to the web 4 by a horizontal bolt-welding mixed method, a horizontal weld 9 or a horizontal bolt 8 , and the plane where the other leg of the horizontal steel section 7 is located is perpendicular to the web 4 .

[0046] Specifically, the vertical bolt welding hybrid method refers to connecting the vertical steel section 6 with the web 4 through the vertical weld 10 and the vertical bolt 11 at the same time, and the horizontal bolt welding hybrid method refers to connecting the horizontal steel section 7 with the web 4 through the horizontal weld 9 or the horizontal bolt 8 at the same time.

[0047] The left and right ends of the horizontal steel section 7 are respectively welded to the two vertical steel sections 6 in the same reinforcement unit.

[0048] The reinforcing unit is arranged on one side or both sides of the rectangular hole 5 of the web 4 .

[0049] The two reinforcement units arranged on both sides are symmetrically connected to the two side walls of the web 4 .

[0050] The left and right ends of the horizontal steel 7 extend out of the rectangular hole 5 by equal distances, respectively, and the range of the distances is 100 to 300 mm.

[0051] In a specific implementation, the vertical steel 6 can be an L-shaped angle steel or a U-shaped channel steel, and the horizontal steel 7 can be an L-shaped angle steel.

[0052] When the vertical steel 6 is a U-shaped channel steel, there are two connection forms between the U-shaped channel steel and the steel beam 4, namely, the web of the channel steel is parallel to the web 4 of the steel beam 1, and the flange plate of the channel steel is parallel to the web 4 of the steel beam 1.

[0053] When the web of the channel steel is parallel to the web 4 of the steel beam 1: the web of the channel steel is fixedly connected to the web (4) of the steel beam (1), and the plane where the flange plate of the channel steel is located is perpendicular to the web 4 of the steel beam 1.

[0054] When the flange plate of the channel steel is parallel to the web plate 4 of the steel beam 1: a flange plate of the channel steel is fixedly connected to the web plate (4) of the steel beam (1), and the plane where the web plate of the channel steel is located is perpendicular to the web plate 4 of the steel beam 1.

[0055] The utility model can be divided into 12 main connection forms according to the type of stiffening components and the connection method of the stiffening component web. The specific connection forms are as follows: Figure 3 (a)- Figure 3 (n) and as shown in Table 1:

[0056] Table 1 Stiffener connection form

[0057]

[0058] like Figure 4 As shown, in a specific implementation, the two ends of the horizontal steel sections 6 on the upper and lower sides of the rectangular hole 5 are firstly welded to the two vertical steel sections 6 respectively to form a "mouth"-shaped extension structure, and then connected to the steel beam 4; the horizontal steel sections 7 on the upper and lower sides are connected to the web 4 by horizontal bolts 8 or horizontal welds 9 or a mixed connection of bolt welding; the two ends of the vertical steel sections 6 are respectively welded to the upper flange 2 and the lower flange 3 of the steel beam, and the vertical steel sections 6 and the web 4 of the steel beam can be connected by vertical welds 10 or vertical bolts 11 or a mixed connection of bolt welding.

[0059] The reinforcement structure of the utility model is applicable to steel beams with rectangular holes in the web and steel-concrete composite beams with rectangular holes in the web. When the web 4 opening is located in the negative bending moment zone of the beam, the vertical steel 6 can also be used to improve the lateral stability of the lower flange 3 of the beam to prevent the distortion and buckling of the cross section of the steel beam 1.

Claims

1. A steel beam web reinforcement structure with rectangular holes using steel sections, characterized in that: The invention comprises a steel beam (1) and a reinforcement unit; the steel beam (1) is mainly composed of an upper flange (2), a lower flange (3) and a web (4); the upper flange (2) and the lower flange (3) are arranged in parallel, and the web (4) is connected between the upper flange (2) and the lower flange (3); a rectangular hole (5) is opened in the middle of the web (4), and a reinforcement unit is arranged at the rectangular hole (5) of the web (4).

2. The steel beam web plate rectangular hole reinforcement structure according to claim 1 is characterized in that: The reinforcement unit comprises two vertical steel sections (6) and two horizontal steel sections (7); Two vertical steel sections (6) are symmetrically arranged on the left and right sides of the rectangular hole (5), and the vertical steel sections (6) are arranged along the height direction of the steel beam (1); two horizontal steel sections (7) are symmetrically arranged on the upper and lower sides of the rectangular hole (5), and the horizontal steel sections (7) are arranged along the length direction of the steel beam (1); the vertical steel sections (6) and the horizontal steel sections (7) are arranged vertically, and the vertical steel sections (6) and the horizontal steel sections (7) are welded to form a "mouth"-shaped structure, and the horizontal steel sections (7) extend from the upper and lower sides of the vertical steel sections (6).

3. The steel beam web reinforcement structure with rectangular holes reinforced by section steel according to claim 2, characterized in that: The upper and lower ends of the vertical steel section (6) extend to the upper flange (2) and the lower flange (3) of the steel beam (1) respectively; the upper end and the lower end of the vertical steel section (6) are respectively welded to the upper flange (2) and the lower flange (3) of the steel beam (1) via flange welds (12); one limb of the vertical steel section (6) is fixedly connected to the web (4) via a vertical weld (10) or a vertical bolt (11); and the plane where the other limb of the vertical steel section (6) is located is perpendicular to the web (4); One limb of the horizontal steel section (7) is fixedly connected to the web (4) via a horizontal weld (9) or a horizontal bolt (8), and the plane where the other limb of the horizontal steel section (7) is located is perpendicular to the web (4).

4. The steel beam web reinforcement structure with rectangular holes reinforced by section steel according to claim 2, characterized in that: The left and right ends of the horizontal steel section (7) are respectively welded to two vertical steel sections (6).

5. The steel beam web reinforcement structure with rectangular holes reinforced by section steel according to claim 2, characterized in that: The reinforcing unit is arranged on one side or both sides of the rectangular hole (5) of the web (4).

6. The steel beam web reinforcement structure with rectangular holes reinforced by section steel according to claim 5, characterized in that: The two reinforcement units arranged on both sides are symmetrically connected to the two side walls of the web (4).

7. The steel beam web reinforcement structure with rectangular holes reinforced by section steel according to claim 2, characterized in that: The left and right ends of the horizontal steel (7) extend out of the rectangular hole (5) by equal distances respectively.

8. The steel beam web reinforcement structure with rectangular holes reinforced by section steel according to claim 2, characterized in that: The vertical steel (6) is made of angle steel or channel steel, and the horizontal steel (7) is made of angle steel.

9. The steel beam web plate rectangular hole reinforcement structure using section steel reinforcement according to claim 8, characterized in that: When the vertical steel section (6) is a channel steel, the web of the channel steel is fixedly connected to the web (4) of the steel beam (1), and the plane where the flange plate of the channel steel is located is perpendicular to the web (4) of the steel beam (1).

10. The steel beam web reinforcement structure with rectangular holes reinforced by section steel according to claim 8, characterized in that: When the vertical steel section (6) is a channel steel, a flange plate of the channel steel is fixedly connected to the web (4) of the steel beam (1), and the plane where the web of the channel steel is located is perpendicular to the web (4) of the steel beam (1).

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