Connecting joint structure and method for thin-wall steel beam and steel column

Abstract

The invention provides a thin-wall steel beam and steel column connecting node structure and method.The thin-wall steel beam and steel column connecting node structure comprises the thin-wall steel column and the thin-wall steel beam, the installation elevation position of the bottom of the steel beam is calibrated on the thin-wall steel column in advance, the thin-wall steel column is sleeved with a column stiffening rib at the corresponding elevation position, and the column stiffening rib and the thin-wall steel column are welded and fixed; rabbets are formed in the ends of the thin-wall steel beams, the thin-wall steel beams are in butt joint through the rabbets and are connected to the column stiffening ribs, and on-beam stiffening ribs are arranged at the upper flanges of the thin-wall steel beams. The problems that in the prior art, the column wall of the thin-wall steel column is prone to local buckling or deformation, and serious stress concentration is generated at the abrupt change position of the end section of the steel beam are solved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of steel structure, and particularly relates to a connecting joint structure and method of a thin-walled steel beam and a steel column. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute the prior art.

[0003] In modern steel structure engineering, thin-walled steel members are widely used in structures such as workshops, warehouses, low multi-story buildings, etc. due to their light weight, high strength, and good economy. However, the connecting joint between the thin-walled steel beam and the steel column is the key part of the force transmission and safety of the whole structure, and the rationality of its design and construction directly affects the overall performance of the structure.

[0004] Traditional steel beam-column connecting joints mostly adopt bolted and welded hybrid connection or external hanging connecting plate forms. For conventional thickness steel, these traditional joint technologies are quite mature. However, when applied to thin-walled steel beams and steel columns, due to the thin wall of the thin-walled steel column, under the action of large shear force and bending moment at the end of the steel beam, the support reaction force of the steel beam on the thin-walled steel column will concentrate on the local area of the column wall, causing the column wall of the thin-walled steel column to be prone to local buckling or deformation. At the same time, in order to connect with the steel column, it is usually necessary to cut or punch holes at the end of the steel beam. If the shape of the cutout is not properly designed, severe stress concentration will occur at the sudden change of the beam end section, which not only significantly reduces the fatigue performance of the joint, but also may cause cracks and lead to premature failure of the beam end. SUMMARY

[0005] In view of the above problems, the present application provides a connecting joint structure and method of a thin-walled steel beam and a steel column, which solves the problems of the column wall of the thin-walled steel column being prone to local buckling or deformation and the severe stress concentration at the sudden change of the beam end section in the prior art.

[0006] In order to achieve the above-mentioned purpose, the present application is realized by the following technical scheme: In a first aspect, the present application provides a connecting joint structure of a thin-walled steel beam and a steel column, comprising: a thin-walled steel column and a thin-walled steel beam, the thin-walled steel column is pre-marked with an installation elevation position of the bottom of the steel beam, the thin-walled steel column is sleeved with a column stiffening rib at the corresponding elevation, the column stiffening rib is welded and fixed with the thin-walled steel column, the end of the thin-walled steel beam is provided with a rebate, and the thin-walled steel beam is connected to the column stiffening rib through the rebate, and a beam upper stiffening rib is arranged at the upper flange of the thin-walled steel beam.

[0007] As a further implementation manner, the column stiffening rib is a ring-shaped stiffening plate, which is sleeved and surrounds the outer periphery of the thin-walled steel column, and is arranged at the corresponding position where the thin-walled steel column and the thin-walled steel beam are connected.

[0008] As a further implementation manner, the annular stiffening plate is made of two half-annular plate pieces butt-jointed and welded or is made of a whole annular plate.

[0009] As a further implementation manner, the column stiffening rib is welded with the thin-walled steel column by using an angle weld.

[0010] As a further implementation manner, the rebate is a cutout along the length direction of the outer sidewall of the thin-walled steel beam, and the shape of the rebate of the thin-walled steel beam is matched with the cross-sectional shape of the thin-walled steel column and the size of the column stiffening rib, so that the thin-walled steel beam can be stably placed.

[0011] As a further implementation manner, the beam upper stiffening rib is arranged at the top or bottom of the upper flange of the thin-walled steel beam.

[0012] As a further implementation manner, the web of the thin-walled steel beam is connected with the column stiffening rib by a weld, and the upper flange of the thin-walled steel beam is connected with the beam upper stiffening rib by a weld.

[0013] In a second aspect, the application further provides a design method of a connection joint structure of a thin-walled steel beam and a steel column, comprising the following steps: S1: determining the cross-sectional size of the thin-walled steel beam and the cross-sectional size of the thin-walled steel column according to the design load; S2: designing the size and thickness of the column stiffening rib according to the support reaction of the steel beam and the wall thickness of the thin-walled steel column; the thickness of the column stiffening rib should be not less than the wall thickness of the thin-walled steel column, and the vertical height thereof should be determined by calculation to ensure the transmission of the beam end shear force and prevent local buckling of the steel column; S3: determining the installation elevation of the steel beam and marking the beam bottom position on the thin-walled steel column; S4: determining the slotting shape and size of the steel beam end rebate according to the size of the column stiffening rib and the cross section of the steel column; S5: designing the arrangement position, quantity and size of the beam upper stiffening rib according to the stress condition of the steel beam.

[0014] In a third aspect, the application further provides a construction method of a connection joint of a thin-walled steel beam and a steel column, comprising the following steps: S1: determining the beam bottom installation position of the thin-walled steel beam according to the design elevation; S2: marking the beam bottom installation position line on the thin-walled steel column; S3: sleeving or attaching the column stiffening rib at the beam bottom installation position marked on the thin-walled steel column, and welding and fixing the column stiffening rib with the thin-walled steel column; S4: opening a rebate at the end of the thin-walled steel beam for connection with the thin-walled steel column; S5: hoist the thin-walled steel beam, make the tongue-and-groove at the end thereof butt joint with the corresponding position on the thin-walled steel column, and carry out preliminary positioning; S6: install the beam upper stiffening rib at the upper flange of the thin-walled steel beam; S7: weld all the connecting positions, including the interface between the thin-walled steel beam and the thin-walled steel column, the interface between the thin-walled steel beam and the column stiffening rib, the interface between the thin-walled steel beam and the beam upper stiffening rib, and the interface between each stiffening rib and the corresponding main structure, to form a rigid connecting joint.

[0015] As a further implementation manner, in step S3, before welding the column stiffening rib, the size and welding requirement of the stiffening rib are calculated and determined according to the wall thickness of the thin-walled steel column and the load transmitted by the steel beam.

[0016] Compared with the prior art, the application has the advantages and positive effects that: The application solves the problem that the column wall of the thin-walled steel column is prone to local buckling or deformation by arranging the column stiffening rib, effectively avoids the local buckling or tearing of the thin-walled steel column under the action of the beam end concentrated force, solves the problem of serious stress concentration at the beam end section mutation by opening the tongue-and-groove at the beam end, realizes the precise positioning and direct force transmission of the beam column, prevents the instability of the beam upper flange under pressure by arranging the beam upper stiffening rib, and finally ensures the rigidity and integrity of the joint by full-welding connection, so that the structure is safe and reliable.

[0017] The stiffening rib is designed as a ring shape in the application, which can provide uniform and omnidirectional strengthening and restraint to the steel column. The ring-shaped stiffening plate is formed by butt-welding two half-ring plate members or is made of an entire ring plate. For a fixed steel column, the two half-ring plates can wrap the steel column from both sides and then are welded at the butt joint, which reduces the hoisting and installation difficulty. The split design makes it not limited by the installation state of the steel column and the surrounding components. It has strong adaptability whether for the installation of a new structure or the reinforcement and reconstruction of an existing structure. The entire ring plate has no butt weld, which avoids the risk that the quality defects of the weld become weak areas. The ring plate forms a complete closed loop, and the restraint stiffness and support effect on the column are more uniform.

[0018] The tongue-and-groove is a cutout along the length direction of the outer side wall of the thin-walled steel beam. The shape of the tongue-and-groove of the thin-walled steel beam is matched with the cross-sectional shape of the thin-walled steel column and the size of the column stiffening rib, so that the steel beam can be stably placed. The tongue-and-groove is a vertical cutout matched with the connecting position of the steel column, which can clamp the steel column to realize rapid preliminary positioning and centering. The matched shape enables the shear force and pressure to be directly transmitted to the steel column, reduces the dependence on connecting plates, and reduces the stress concentration phenomenon. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0020] Fig. 1 This is a top view of the connection node structure between the thin-walled steel beam and the steel column of the present invention; Fig. 2 This is a front view of the connection node structure between the thin-walled steel beam and the steel column of the present invention.

[0021] In the diagram: 1. Thin-walled steel column; 2. Thin-walled steel beam; 3. Column stiffening rib; 4. Beam stiffening rib; 5. Tongue and groove joint. Detailed Implementation

[0022] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0023] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless otherwise expressly indicated by the invention, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. Example 1 This embodiment provides a connection node structure between a thin-walled steel beam and a steel column, such as... Figs. 1-2 As shown, it includes: a thin-walled steel column 1 and a thin-walled steel beam 2. The thin-walled steel column 1 is a steel column with a wall thickness of less than 3mm, and the thin-walled steel beam 2 is a steel beam with a wall thickness of less than 3mm. The installation elevation position of the bottom of the steel beam is pre-marked on the thin-walled steel column 1. The thin-walled steel column 1 is fitted with a column stiffening rib 3 at the corresponding elevation. The column stiffening rib 3 is welded and fixed to the thin-walled steel column 1. The end of the thin-walled steel beam 2 is provided with a tongue and groove joint 5. The thin-walled steel beam 2 is connected to the column stiffening rib 3 through the tongue and groove joint 5. The upper flange of the thin-walled steel beam 2 is provided with a beam stiffening rib 4. By setting column stiffening ribs 3, local buckling or tearing of thin-walled steel column 1 under concentrated force at beam end is effectively avoided; by opening tongue and groove at beam end 5, precise positioning and direct force transmission of beam and column are achieved; by setting stiffening ribs 4 on beam, instability of upper flange of beam under pressure is prevented; finally, by fully welded connection, the stiffness and integrity of the node are ensured, making the structure safe and reliable.

[0024] As a further implementation manner, the column stiffening rib 3 is a ring-shaped stiffening plate, which is sleeved and surrounds the outer periphery of the thin-walled steel column 1 and is arranged at the corresponding position where the thin-walled steel column 1 is connected with the thin-walled steel beam 2. The stiffening rib is designed as a ring shape, which can provide uniform and all-around strengthening and restraint to the steel column, effectively improve the overall stiffness and buckling resistance of the steel column at the joint, and is suitable for construction scenes with large stress or weak column section, thereby ensuring the stability of the column and making the force flow transmission more uniform.

[0025] As a further implementation manner, the ring-shaped stiffening plate is formed by butt welding of two half-ring plates or is an integral ring plate. For a fixed steel column, especially as a column in a frame structure, it is impossible to sleeve an integral ring plate from the top of the column. The two half-ring plates can be wrapped around the steel column from both sides and then welded at the butt joint, thereby reducing the hoisting and installation difficulty and simplifying the construction process. The split design makes it not limited by the installation state of the steel column and the surrounding components. It has strong adaptability whether for installation of a new structure or reinforcement and reconstruction of an existing structure. The integral ring plate has no butt weld, thereby avoiding the risk that a quality defect of the weld becomes a weak area. As a complete closed loop, the ring plate has more uniform constraint stiffness and support to the column. For a segmented prefabricated steel column in a factory, the integral ring-shaped stiffening rib can be sleeved and welded in advance in the factory, which can better control the roundness and welding quality of the ring plate and ensure the stability and reliability of the product.

[0026] As a further implementation manner, the column stiffening rib 3 and the thin-walled steel column 1 are welded by using a fillet weld. The stiffening rib is used to bear and disperse the concentrated force from the steel beam and prevent local buckling of the steel column. The concentrated force is a radial force perpendicular to the axis of the steel column. If a fusion weld that needs to be beveled is used, the heat input during welding is larger and more concentrated, which is easy to cause the steel column plate to be burned through, deformed or generate excessive welding residual stress. The fillet weld belongs to corner fillet welding, and the heat input is relatively dispersed and controllable, which can effectively avoid these risks and protect the integrity of the thin-walled base material. Through the fillet welds arranged around the stiffening rib, a stable stress area can be formed, and the force flow is uniformly transmitted from the stiffening rib to the steel column, thereby realizing the strengthening effect.

[0027] As a further implementation manner, the rebate 5 is a cutout formed along the length direction of the outer side wall of the thin-walled steel beam 2. The shape of the rebate 5 of the thin-walled steel beam 2 is matched with the cross-sectional shape of the thin-walled steel column 1 and the size of the column stiffening rib 3, so that the steel beam can be stably placed. The rebate 5 is a vertical cutout matched with the connection part of the steel column, and the rebate 5 can clamp the steel column to realize rapid and preliminary positioning and centering. The matched shape enables the shear force and pressure to be directly transmitted to the steel column, reduces the dependence on the connecting plate, and reduces the stress concentration phenomenon.

[0028] As a further implementation manner, the beam stiffening rib 4 is arranged on the top or bottom of the flange of the thin-walled steel beam 2, so that the flange can be effectively constrained by the beam stiffening rib 4 to prevent the thin-walled steel beam 2 from losing stability.

[0029] As a further implementation manner, the web of the thin-walled steel beam 2 is connected with the column stiffening rib 3 through a weld seam; and the upper flange of the thin-walled steel beam 2 is connected with the beam stiffening rib 4 through a weld seam. The weld seam connects the beam, the stiffening rib and the column into an integral whole, thereby improving the bending stiffness and shear stiffness of the joint. The end bending moment can be better borne, the structural deformation is reduced, the relative sliding or separation between the stiffening rib and the beam body is prevented, and the stiffening rib can strengthen the connection between the beam body and the thin-walled steel column 1.

[0030] Embodiment 2 The embodiment provides a design method of a connection joint structure of a thin-walled steel beam and a steel column, which comprises the following steps: S1: determining the sectional size of the thin-walled steel beam 2 and the sectional size of the thin-walled steel column 1 according to the design load; S2: designing the size and thickness of the column stiffening rib 3 according to the support reaction of the steel beam and the wall thickness of the thin-walled steel column 1; the thickness of the column stiffening rib 3 should be not less than the wall thickness of the thin-walled steel column 1, and the vertical height thereof should be determined through calculation to ensure the transmission of the beam end shear force and prevent the local buckling of the steel column; S3: determining the installation elevation of the steel beam, and marking the beam bottom position on the thin-walled steel column 1; S4: determining the slotting shape and size of the steel beam end rebate 5 according to the size of the column stiffening rib 3 and the steel column section; S5: designing the arrangement position, quantity and size of the beam stiffening rib 4 according to the stress condition of the steel beam.

[0031] Embodiment 3 The embodiment provides a construction method of a thin-walled steel beam 2 and steel column connection joint, which comprises the following steps: S1: determining the beam bottom installation position of the thin-walled steel beam 2 according to the design elevation, and marking the beam bottom installation position line on the thin-walled steel column 1, which can ensure that the installation benchmarks of all thin-walled steel beams 2 are uniform and accurate, avoid the cumulative error caused by the measurement of each beam in the traditional construction, and greatly improve the installation efficiency and quality; S2: sleeving or attaching the column stiffening rib 3 on the beam bottom installation position marked on the thin-walled steel column 1, and welding and fixing the column stiffening rib 3 and the thin-walled steel column 1; before welding the column stiffening rib 3, the size and welding requirement of the stiffening rib are calculated and determined according to the wall thickness of the thin-walled steel column 1 and the load transmitted by the steel beam; S3: opening the rebate 5 for connecting with the thin-walled steel column 1 at the end of the thin-walled steel beam 2; S4: hoist the thin-walled steel beam 2, make its end's tongue-and-groove 5 butt joint with the corresponding position on the thin-walled steel column 1, and carry out preliminary positioning; through the construction sequence of first welding and fixing the column stiffening rib 3 with the steel column, then installing the thin-walled steel beam 2, the great heat and shrinkage stress generated when welding the stiffening rib can be effectively avoided from directly acting on the already positioned beam, leading to the change of the elevation and position of the beam, and the deformation that cannot be corrected is caused; S5: install the beam stiffening rib 4 at the upper flange of the thin-walled steel beam 2; S6: weld all the connecting parts, including the interface between the thin-walled steel beam 2 and the thin-walled steel column 1, the thin-walled steel beam 2 and the column stiffening rib 3, the thin-walled steel beam 2 and the beam stiffening rib 4, and the interface between each stiffening rib and the corresponding main structure, to form a rigid connection node.

[0032] The above describes the specific embodiments of the present application in combination with the drawings, but is not a limitation on the protection scope of the present application, and those skilled in the art should understand that various modifications or changes made by those skilled in the art on the basis of the technical solutions of the present application without creative labor are still within the protection scope of the present application.

Claims

1. A connection node structure between a thin-walled steel beam and a steel column, characterized in that, include: Thin-walled steel columns and thin-walled steel beams are provided. The installation elevation of the bottom of the steel beam is pre-marked on the thin-walled steel column. The thin-walled steel column is fitted with a column stiffening rib at the corresponding elevation. The column stiffening rib is welded and fixed to the thin-walled steel column. The end of the thin-walled steel beam is tongue and grooved. The thin-walled steel beam is connected to the column stiffening rib by tongue and groove. The upper flange of the thin-walled steel beam is provided with a beam stiffening rib.

2. The connection node structure between a thin-walled steel beam and a steel column as described in claim 1, characterized in that, The column stiffening rib is an annular stiffening plate, which is fitted and surrounds the outer periphery of the thin-walled steel column and is located at the corresponding position where the thin-walled steel column and the thin-walled steel beam are connected.

3. The connection node structure between a thin-walled steel beam and a steel column as described in claim 1, characterized in that, The annular stiffening plate is formed by butt welding two semi-annular plates or by making a whole annular plate.

4. The connection node structure between a thin-walled steel beam and a steel column as described in claim 1, characterized in that, The stiffening ribs of the column are welded to the thin-walled steel column using fillet welds.

5. The connection node structure between a thin-walled steel beam and a steel column as described in claim 1, characterized in that, The tongue and groove is a cut made along the length of the outer side wall of the thin-walled steel beam. The shape of the tongue and groove of the thin-walled steel beam is adapted to the cross-sectional shape of the thin-walled steel column and the size of the column stiffening ribs, so that the steel beam can be placed stably.

6. The connection node structure between a thin-walled steel beam and a steel column as described in claim 1, characterized in that, The stiffening ribs on the beam are provided at the top or bottom of the upper flange of the thin-walled steel beam.

7. The connection node structure between a thin-walled steel beam and a steel column as described in claim 1, characterized in that, The web of the thin-walled steel beam is connected to the stiffening rib of the column by a weld; the upper flange of the thin-walled steel beam is connected to the stiffening rib of the beam by a weld.

8. The design method for a connection node structure between a thin-walled steel beam and a steel column as described in any one of claims 1-7, characterized in that, Includes the following steps: S1: Determine the cross-sectional dimensions of the thin-walled steel beam and the thin-walled steel column based on the design load; S2: Based on the support reaction force of the steel beam and the wall thickness of the thin-walled steel column, design the size and thickness of the column stiffening rib; the thickness of the column stiffening rib should not be less than the wall thickness of the thin-walled steel column, and its vertical height should be determined by calculation to ensure the transmission of beam end shear force and prevent local buckling of the steel column. S3: Determine the installation elevation of the steel beam and mark the position of the bottom of the beam on the thin-walled steel column; S4: Determine the groove shape and size of the tongue and groove at the end of the steel beam based on the dimensions of the column stiffeners and the cross-section of the steel column; S5: Based on the stress conditions of the steel beam, design the arrangement, quantity, and dimensions of the stiffening ribs on the beam.

9. A construction method for a thin-walled steel beam and steel column connection node as described in any one of claims 1-7, characterized in that, Includes the following steps: S1: Determine the installation position of the bottom of the thin-walled steel beam according to the design elevation; S2: Mark the installation position line at the bottom of the beam on the thin-walled steel column; S3: Fit or attach the column stiffening ribs to the beam bottom installation positions marked on the thin-walled steel column, and weld the column stiffening ribs to the thin-walled steel column for fixation; S4: A tongue and groove joint is provided at the end of the thin-walled steel beam for connection with the thin-walled steel column; S5: Hoist the thin-walled steel beam, align the tongue and groove joints at its ends with the corresponding positions on the thin-walled steel column, and perform preliminary positioning; S6: Install upper stiffening ribs on the upper flange of the thin-walled steel beam; S7: Weld all connection parts, including the connection between thin-walled steel beams and thin-walled steel columns, the connection between thin-walled steel beams and column stiffeners, the connection between thin-walled steel beams and stiffeners on beams, and the interfaces between each stiffener and the corresponding main structure, to form rigid connection nodes.

10. The working method of the connection node structure between a thin-walled steel beam and a steel column as described in claim 9, characterized in that, In step S3, before welding the stiffening ribs of the column, the dimensions and welding requirements of the stiffening ribs are calculated and determined based on the wall thickness of the thin-walled steel column and the load transmitted by the steel beam.

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