A portal frame with corrugated webs in the mid-span section

Abstract

The utility model proposes a portal frame with a corrugated web in the mid-span section, wherein the mid-span section of the inclined beam of the portal frame is a corrugated web H-shaped steel; both ends of the corrugated web H-shaped steel are connected to the frame column through flat web H-shaped steel; the utility model replaces the middle section of the large-span roof beam that originally adopted the equal-section flat web H-shaped steel with the corrugated web H-shaped steel, fully utilizes the good shear resistance of the corrugated web H-shaped steel, effectively reduces the web thickness, saves 50% of the web steel consumption, and the bearing capacity can also be improved, which is also helpful for the rigidity of the whole frame.

Description

Technical Field

[0001] The utility model relates to the technical field of portal frame technology, in particular to a portal frame with a corrugated web in the mid-span section. Background Art

[0002] The portal frame light steel structure is a traditional structural system. The upper main frame of this type of structure includes rigid frame diagonal beams, rigid frame columns, supports, etc. It has the characteristics of simple force, clear force transmission path, fast component production, easy factory processing, and short construction period. Therefore, it is widely used in industrial and civil buildings such as industry, commerce, and cultural and entertainment public facilities. Among them, the rigid frame columns and rigid frame diagonal beams are solid-web H-shaped steels. For sections with large bending moment changes, variable-section H-shaped steels are used to maximize the value of steel. Usually, the middle section of the large-span roof beam uses a lower-height equal-section H-shaped steel. The equal-section H-shaped steel has a low economy and a poor section moment of inertia. Under the premise that the corrugated web has a good section moment of inertia, applying it to the rigid frame diagonal beam can effectively improve the overall performance and reduce the amount of steel used. However, in the existing technology, the application of corrugated webs in frame diagonal beams is still a blank. Utility Model Content

[0003] The utility model aims to provide a portal frame with a corrugated web in the mid-span section, which can effectively improve the section inertia moment and the section resistance moment and effectively reduce the overall steel consumption.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a portal frame with a corrugated web in the mid-span section, and the mid-span section of the frame oblique beam of the portal frame is a corrugated web H-shaped steel.

[0005] Furthermore, both ends of the corrugated web H-shaped steel are connected to the flat web H-shaped steel.

[0006] Furthermore, the flat web H-shaped steel is connected to the frame columns of the portal frame.

[0007] Furthermore, after the ends of the flat web H-shaped steel and the corrugated web H-shaped steel are aligned, the connection between the flanges is achieved by bolt welding.

[0008] Furthermore, the upper and lower flanges connected to the corrugated web and the flat web H-shaped steel are connected by a connecting plate, and the connecting plate is fixed by an appropriate amount of bolts; after the lifting is completed, the connected flanges are welded and fixed using the connecting plate as an arc-starting plate.

[0009] Furthermore, there are two connecting plates on the upper flange, which are respectively located on both sides of the web and fixed to the bottom of the upper flange by bolts.

[0010] Furthermore, the connecting plate of the lower flange is a whole connecting plate located below the connected lower flange.

[0011] Compared with the prior art, the advantages of the present invention are as follows: the middle section of the large-span roof beam adopts a lower-height uniform-section H-shaped steel. If the height of this part of the beam is increased, it will not affect the net height of the building; based on this, the present application changes the middle section into a corrugated web H-shaped steel beam, which is about 30% higher than the flat web H-shaped steel beam. Under the premise of ensuring the shear resistance, the web thickness is reduced; about 50% of the web steel consumption can be saved, and the bearing capacity can also be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is an elevation view of a portal frame in an embodiment of the utility model;

[0013] Figure 2 It is the bending moment envelope diagram of the portal frame in the embodiment of the utility model.

[0014] Figure 3 It is a schematic diagram of the connection structure of the corrugated web and the flat web H-shaped steel in the embodiment of the utility model.

[0015] Figure 4 It is a structural schematic diagram of the connecting plate in an embodiment of the utility model. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be further described below.

[0017] like Figure 1 As shown, the utility model proposes a portal frame with a corrugated web in the mid-span section, which is composed of a plurality of frame columns 1 and frame diagonal beams; adjacent frame columns 1 are overlapped with frame diagonal beams;

[0018] In this embodiment, the mid-span section of the steel frame diagonal beam is a corrugated web H-shaped steel 22; both ends of the corrugated web H-shaped steel 22 are connected to the flat web H-shaped steel 21; the flat web H-shaped steel 21 is connected to the steel frame column 1 of the portal frame.

[0019] In order to verify the economy and mechanical performance of the portal frame with corrugated web in the mid-span section of the utility model, a comparison is made with the original flat web H steel beam portal frame in the mid-span section, as follows:

[0020] The cross section of the original flat web H steel beam in the mid-span section is H450*200*6*12; the cross-sectional area is 7500mm 2 ; Sectional moment of inertia is 269966300mm 4 ; Section resistance moment is 1199850mm 3 ;

[0021] like Figure 2As shown, a corrugated web H steel beam is used instead, with a cross-section of ZH600*200*1.5*12; the cross-sectional area is 5800mm 2 ; Sectional moment of inertia is 414892800mm 4 ; Section resistance moment is 1382976mm 3 Compared with the original design, it can save 27% of steel, increase the section inertia by 53%, and increase the section resistance moment by 15%.

[0022] In this embodiment, if Figure 3 As shown, the upper and lower flanges of the corrugated web H-shaped steel 22 and the flat web H-shaped steel 21 are connected by a connecting plate 3, and the connecting plate 3 is fixed by an appropriate amount of bolts; after the lifting is completed, the connected flanges are welded and fixed using the connecting plate 3 as an arc-starting plate. The present invention fully considers the actual load conditions during the construction stage, and therefore adopts the process steps of flange bolting during the construction stage and flange welding after lifting to replace the traditional portal frame end plate connection, which can effectively reduce the amount of steel used in the connection node while ensuring that the overall stress of the structure remains unchanged or even increased. Figure 4 As shown in the figure, there are two connecting plates on the upper flange, which are located on both sides of the web and fixed to the bottom of the upper flange by bolts. The connecting plate of the lower flange is a whole connecting plate located below the connected lower flange. The connecting plate not only increases the joint stiffness, but also serves as the arc starter plate and lining plate for welding. When welded together, it can also play a reinforcing role and make up for the problem of insufficient welding quality that may occur in on-site welding.

[0023] The above are only preferred embodiments of the present invention and do not limit the present invention in any way. Any technician in the relevant technical field, without departing from the scope of the technical solution of the present invention, may make any equivalent replacement or modification to the technical solution and technical content disclosed in the present invention, which shall be deemed as the content of the technical solution of the present invention and still fall within the protection scope of the present invention.

Claims

1. A portal frame with a corrugated web in the mid-span section, characterized in that: The mid-span section of the inclined beam of the portal frame is a corrugated web H-shaped steel.

2. The portal frame with corrugated webs in the mid-span section according to claim 1 is characterized in that: Both ends of the corrugated web H-shaped steel are connected to the flat web H-shaped steel.

3. The portal frame with corrugated webs in the mid-span section according to claim 2 is characterized in that: The flat web H-shaped steel is connected to the frame column of the portal frame.

4. The portal frame with corrugated webs in the mid-span section according to claim 2 is characterized in that: After the ends of the flat web H-shaped steel and the corrugated web H-shaped steel are aligned, the connection between the flanges is achieved by bolt welding.

5. The portal frame with corrugated webs in the mid-span section according to claim 4 is characterized in that: The upper and lower flanges of the corrugated web and the flat web H-shaped steel are connected by a connecting plate, and the connecting plate is fixed by an appropriate amount of bolts; after the lifting is completed, the connected flanges are welded and fixed using the connecting plate as an arc-starting plate.

6. The portal frame with corrugated webs in the mid-span section according to claim 5 is characterized in that: There are two connecting plates on the upper flange, which are respectively located on both sides of the web and fixed to the bottom of the upper flange by bolts.

7. The portal frame with corrugated webs in the mid-span section according to claim 5 is characterized in that: The connecting plate of the lower flange is a whole connecting plate located below the connected lower flange.

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