Four-way branched column structure of cruciform-shaped cross-section steel member

Abstract

The application relates to a four-way branched column structure of a cross-shaped steel member, which comprises a cross-shaped steel member body, a four-way branched column structure body, a branched point arranged on the cross-shaped steel member body, and a connection between the four-way branched column structure body and the cross-shaped steel member body at the branched point, and a top steel beam fixed with the cross-shaped steel member body through the four-way branched column structure body.

Description

TECHNICAL FIELD

[0001] The present application relates to a four-way branched column structure of a cross-shaped I-section steel member, and belongs to the field of building steel structure design and construction. BACKGROUND

[0002] With the development of society, people have higher and higher requirements for architectural space and architectural details, which directly leads to higher requirements for the form and style of structural members by architects, resulting in the non-conventionality of structural member cross-section types, such as derived cross-shaped members and reduced cross-section sizes, such as derived slender columns. In open spaces, the cross-section forms of steel structure columns generally include circular, rectangular, and I-shaped, etc. Cross-sections are rarely used due to their poor torsional stiffness, but cross-shaped structures meet certain needs of architects in architectural aesthetics. Therefore, under the premise that the structure design meets the requirements of the ultimate state of bearing capacity and the ultimate state of normal use, it is attempted to build a structure that meets both aesthetic and architectural requirements. SUMMARY

[0003] The present application provides a four-way branched column structure of a cross-shaped I-section steel member, which makes it possible to apply cross-shaped steel members in open architectural spaces under the premise of meeting the slenderness ratio requirements of small cross-section cross-shaped steel members.

[0004] The technical solution adopted by the present application to solve its technical problems is:

[0005] A four-way branched column structure of a cross-shaped I-section steel member, comprising a cross-shaped I-section steel member body and a four-way branched column structure body, the cross-shaped I-section steel member body is provided with a branching point, the four-way branched column structure body is connected with the cross-shaped I-section steel member body at the branching point, and an upper steel beam is fixed with the cross-shaped I-section steel member body through the four-way branched column structure body.

[0006] As a further preferred embodiment of the present application, the four-way branched column structure body comprises a cover plate and four I-shaped steel columns, the cover plate has a square structure, the upper flange of each I-shaped steel column is connected with one side of the cover plate, and the lower flange of the same I-shaped steel column is connected with the flange of the adjacent cross-shaped I-section steel member body.

[0007] As a further preferred embodiment of the present application, the four-way branched column structure body comprises a biaxial web and a T-shaped steel column, the platform of the biaxial web is fixed on the web section of the cross-shaped I-section steel member body, the raised part of the biaxial web is fixedly connected with the web bottom end of the T-shaped steel column, and the flange of the T-shaped steel column is connected with the flange of the adjacent cross-shaped I-section steel member body.

[0008] As a further preferred embodiment of the present application, a center line passing through the center of the cover plate and perpendicular to the ground is taken as a reference line, and a bifurcation angle is formed between the center line and the web of the adjacent I-shaped steel column, and the bifurcation angle ranges from 22.5° to 45°.

[0009] As a further preferred embodiment of the present application, a center line passing through the center of the platform of the bidirectional web and perpendicular to the ground is taken as a reference line, and a bifurcation angle is formed between the center line and the web of the adjacent T-shaped steel column, and the bifurcation angle ranges from 22.5° to 45°.

[0010] Through the above technical solution, compared with the prior art, the present application has the following beneficial effects:

[0011] 1. The present application bifurcates the column body of the cross-shaped I-shaped steel member body in four directions at a certain height position, so that the entire structure meets the specification requirements of the slenderness ratio while obtaining a smaller cross-sectional size;

[0012] 2. In the embodiment provided by the four-direction bifurcated column structure body of the present application, when the four-direction bifurcated column structure body is four I-shaped steel columns, a cover plate is arranged at the bifurcation to solve the problem of staggered flanges of the cross-shaped I-shaped steel member body;

[0013] 3. In the embodiment provided by the four-direction bifurcated column structure body of the present application, when the four-direction bifurcated column structure body is four T-shaped steel columns, a bidirectional web is arranged at the bifurcation to provide an inner circular arc chamfer in the plane, thereby realizing the natural bifurcation of the T-shaped steel column section;

[0014] 4. In the embodiment of the present application, a four-direction bifurcated structure is provided, and when the bifurcated structure in a certain direction is close to a partition wall or a glass curtain wall, the bifurcated structure in this direction can be cancelled and degenerated into a three-direction bifurcated column according to the actual demand of the indoor space of the building;

[0015] 5. Under the condition of meeting the transportation and site hoisting, the cross-shaped I-shaped steel member body and the four-direction bifurcated column structure body can be regarded as a whole, and all the lofting, cutting and assembly are completed in the factory. BRIEF DESCRIPTION OF DRAWINGS

[0016] The present application will be further described below in conjunction with the drawings and embodiments.

[0017] Figure 1 is a schematic diagram of the overall structure of the present application;

[0018] Figure 2 is a schematic diagram of the cross-shaped I-shaped steel member body of the present application;

[0019] Figure 3 is a structure block diagram of the preferred embodiment 1 of the present application;

[0020] Figure 4 isFigure 3 a sectional view taken at A-A;

[0021] Figure 5 is a structural block diagram of preferred embodiment 2 of the present application;

[0022] Figure 6 is a schematic diagram of a bidirectional web structure in preferred embodiment 2 of the present application;

[0023] Figure 7 is Figure 5 a sectional view taken at B-B;

[0024] Figure 8 is a schematic diagram of the size of a cross-shaped I-steel member body assumed in verifying embodiment 1 and embodiment 2;

[0025] Figure 9 is a schematic diagram of the size of an I-steel column exemplified in verifying embodiment 1;

[0026] Figure 10 is a schematic diagram of the size of a T-steel column exemplified in verifying embodiment 2.

[0027] In the drawings: 1 is a cross-shaped I-steel member body, 2 is a four-way branched column structure body, 3 is an I-steel column, 4 is a cover plate, 5 is a T-steel column, 6 is a bidirectional web, 7 is a platform, 8 is a raised portion, and 9 is a branching point. DETAILED DESCRIPTION

[0028] The present application will now be described in further detail with reference to the drawings. These drawings are simplified schematic diagrams, and only show the basic structure of the present application in a schematic manner, and thus only show the components relevant to the present application.

[0029] In the existing open space technology, the cross-sectional shape of the steel structure column generally adopts a circular shape, a rectangular shape, or an I-shaped, and the cross-shaped structure is rarely used. The reason for this is that if the steel structure column adopts a cross-shaped structure, the cross-sectional revolution radius is relatively small, and the impact is that under the condition of unchanged bearing capacity, the long-thin ratio limit value specified in the building seismic design specification is not met.

[0030] Figure 1As shown, from the overall structure, it comprises a cross-shaped steel member body 1 and a four-way branched column structure body 2, the bottom of the four-way branched column structure body 2 is connected to the web section of the cross-shaped steel member body 1, that is to say, a branching point 9 is arranged on the cross-shaped steel member body 1, the four-way branched column structure body 2 is connected at the branching point 9 position of the cross-shaped steel member body 1, and the top of the four-way branched column structure body 2 is fixedly connected with the upper steel beam; through the arrangement of the four-way branched column structure body 2, the height of the cross-shaped steel member body 1 is reduced, and at the same time, the cross-shaped steel member body 1 has a smaller cross section under the condition that the bearing capacity is unchanged, and the requirement of the limit of the slenderness ratio is met.

[0031] Based on the above, the four-way branched column structure body 2 that meets the condition has multiple forms, and two preferred embodiments are provided in the present application, and the two preferred embodiments are verified to prove that they meet the limit of the slenderness ratio.

[0032] The cross-shaped steel member body 1 involved in the present application is as shown in Figure 2 It comprises a web structure arranged in a cross-shaped structure, the web structure comprises four end portions, and each end portion is fixedly provided with a flange, and the flanges in the cross-shaped steel member body 1 are arranged perpendicularly to the web of the cross-shaped steel member body 1.

[0033] Embodiment 1:

[0034] Figure 3 As shown, the four-way branched column structure body 2 comprises a cover plate 4 and four I-shaped steel columns 3, the cover plate 4 has a square structure, that is, the cover plate 4 comprises four side edges, and the four I-shaped steel columns 3 are fixedly connected with the four side edges respectively, and the connection mode of each I-shaped steel column 3 with the adjacent side edge is that the upper flange of the I-shaped steel column 3 is connected with the side edge of the cover plate 4 in a fit manner, and the lower flange of the same I-shaped steel column 3 is connected with the flange of the adjacent cross-shaped steel member body 1 in a fit manner.

[0035] Figure 3 As shown in the side view of the first embodiment, for example, the specific position in the figure, the right flange of the I-shaped steel column 3 on the left side is the upper flange a of the I-shaped steel column 3, the middle is the web b of the I-shaped steel column 3, and the left side is the lower flange c of the I-shaped steel column 3, the short side edge of the upper flange a is fixedly connected with the side edge of the adjacent cover plate 4, and the short side edge of the lower flange c is fixedly connected with the flange d of the adjacent cross-shaped steel member body 1, Figure 4 is Figure 3 the cross-sectional view at A-A in FIG. 4, wherein it can be seen that the web b and the web e of the cross-shaped steel member body 1 are in the same plane, so that the connection of the I-shaped steel column 3 and the cross-shaped steel member body 1 can be realized, and the remaining three I-shaped steel columns 3 are sequentially connected with the cross-shaped steel member body 1 in this mode.

[0036] With the center line through the center of the cover plate 4 and perpendicular to the ground as the reference line, the center line and the web of the adjacent I-shaped structure form a bifurcation angle, and the bifurcation angle ranges from 22.5° to 45°; from Figure 3 As can be seen from the bifurcation angle, the greater the bifurcation angle, the greater the length of the entire structure in the horizontal direction can be easily seen from the side.

[0037] Example 1 is verified, Figure 8 As shown, for example, assuming the total height of the steel column of the entire structure H = 10.0 m, the upper steel beam is horizontally placed, the cross section parameter of the cross I-shaped steel member body 1 is A (H250x50x10x16), the steel material is Q355B, the seismic grade is four, and according to the 8.3.1 article of "Code for seismic design of buildings GB 50011-2010", the limit value of the slenderness ratio is The calculation is as follows:

[0038] Where fay is 355 determined by the steel material Q355B;

[0039] When the I-shaped steel column 3 is not set, the calculated length of the steel column of the entire structure in two directions l 0x = l 0y = H = 10000 mm; The two-direction rotation radius i x = i y = 90.4 mm of the steel column cross section of the cross I-shaped steel member body 1, and the slenderness ratio λ x = λ y = 110.6 > 97.6, the slenderness ratio does not meet the requirements;

[0040] According to the limit value of the slenderness ratio, the bifurcation point 9 height of the bifurcation column is h = 97.6x90.4 = 8823 mm, and h = 8700 mm is taken, then the bifurcation starts at a distance of 8.7 m from the bottom of the column, and in the verification process, the bifurcation angle α = β = 30° is taken, the vertical length above the bifurcation point 9 is (H-h) = (10.0-8.7m) = 1.3m, and the calculated length of the bifurcation column with two ends rigidly connected l l 01x , l 01y , l 02x , l 02y are the calculated lengths of the I-shaped steel column 3 adjacent to the bifurcation angles α and β in two directions respectively;

[0041] When the bifurcation in the four-way bifurcation column structure body 2 is the I-shaped steel column 3 as shown, Figure 9 The cross section is H-shaped cross section, and the cross section is H100x50x10x16, and the two-direction rotation radii i x = 12.1 mm, i y= 36.9 mm, the two direction slenderness ratio Therefore, the embodiment 1 meets the slenderness ratio requirement.

[0042] Embodiment 2:

[0043] Figure 5 As shown, the four-way branched column structure body 2 includes a bidirectional web 6 and a T-shaped steel column 5, the structure of the bidirectional web 6 is as shown in Figure 6 As shown, it includes a platform 7 part, both ends of the platform 7 are two raised parts 8, the two platforms 7 of the bidirectional web 6 are cross-shaped structures and are fixed on the web section of the cross-shaped steel member body 1, the four ends formed by the two platforms 7 are respectively provided with the raised parts 8, and the raised parts 8 are respectively fixedly connected to the web bottom end of a T-shaped steel column 5; the flange of the same T-shaped steel column 5 is connected with the flange of the adjacent cross-shaped steel member body 1;

[0044] Figure 7 As shown, it is Figure 5 The cross section at B-B, the connection between the platform 7 and the raised part 8 of the bidirectional web 6 is smoothly connected, forming a circular arc chamfered web branch, and from the cross section at B-B, it can be seen that the web f of the T-shaped steel column 5 and the web e of the cross-shaped steel member body 1 are in the same plane;

[0045] Taking the center line passing through the center of the platform 7 of the bidirectional web 6 and perpendicular to the ground as the reference line, the center line and the web of the adjacent T-shaped steel column 5 form a branch angle, and the branch angle is in the range of 22.5°-45°.

[0046] The embodiment 2 is verified, Figure 8 As shown, it is assumed that the total height of the steel column of the whole structure is H = 10.0 m, the upper steel beam is horizontally placed, the cross section parameter of the cross-shaped steel member body 1 is A (H250x50x10x16), the steel material is Q355B, and the seismic grade is four levels. According to article 8.3.1 of "Code for Seismic Design of Buildings GB 50011-2010", the slenderness ratio limit is The calculation is as follows:

[0047] Similarly, the value of fay is determined by the steel material Q355B;

[0048] When the T-shaped steel column 5 is not set, the calculated length of the steel column of the whole structure in two directions is 0x = l 0y = H = 10000 mm; the two direction turning radius i of the steel column section of the cross-shaped steel member body 1 is x = i y = 90.4 mm, the two direction slenderness ratio λ of the steel column is x = λ y=110.6 > 97.6, the slenderness ratio does not meet the requirements;

[0049] Based on the slenderness ratio limit, the height of the bifurcation point 9 of the bifurcation column is calculated as h = 97.6 × 90.4 = 8823 mm. Taking h = 8700 mm, the bifurcation begins at a distance of 8.7 m from the bottom of the column. During the verification process, the bifurcation angle is taken as α = β = 30°. The vertical length above the bifurcation point 9 is (Hh) = (10.0 - 8.7 m) = 1.3 m. The calculated length of the bifurcation column with its two ends just connected can then be obtained. l 01x , l 01y , l 02x , l 02y These are the calculated lengths of the I-shaped steel column 3 adjacent to the bifurcation angles α and β in two directions, respectively.

[0050] When the bifurcation in the four-way bifurcation column structure body 2 is Figure 10 When the T-shaped steel column 5 is shown, it is taken as T75×50×10×16, and its radius of gyration is i. x =11.1mm, i y =21.8mm, then the slenderness ratio in both directions Therefore, it can be seen that Example 2 meets the slenderness ratio requirement.

[0051] Verifications in Examples 1 and 2 show that for a cross-shaped steel structure bifurcated column with a total height of 10.0m, a cross-shaped I-section with a cross section of double H250×50×10×16, a bifurcation point 9 8.7m from the column base, and a bifurcation angle of 30°, it can bifurcate into four H-shaped inclined columns with a cross section of H100×50×10×16 (i.e., the I-shaped steel column 3 in this application), or bifurcate into four T-shaped inclined columns with a cross section of T75×50×10×16 (i.e., the T-shaped steel column 5 in this application).

[0052] Those skilled in the art will understand that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the meaning consistent with their meaning in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as herein.

[0053] The meaning of "and / or" as used in this application includes both situations where each exists alone or both exist simultaneously.

[0054] The term "connection" as used in this application can mean a direct connection between components or an indirect connection between components through other components.

[0055] With the above ideal embodiments according to the present application as the inspiration, through the above description, relevant staff can make various changes and modifications without deviating from the technical idea of the present application. The technical scope of the present application is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. A four-way branched column structure of a cross-shaped steel member in cross section, comprising a cross-shaped steel member body, characterized by: The four-way branched column structure body comprises a cover plate and four I-shaped steel columns, the upper flange of each I-shaped steel column is connected to one side of the cover plate, and the lower flange of the same I-shaped steel column is connected to the flange of the adjacent cross-shaped steel member body; or the four-way branched column structure body comprises a biaxial web and a T-shaped steel column, the platform of the biaxial web is fixed on the web section of the cross-shaped steel member body, the raised part of the biaxial web is fixedly connected to the bottom end of the web of the T-shaped steel column, and the flange of the T-shaped steel column is connected to the flange of the adjacent cross-shaped steel member body; the cross-shaped steel member body is provided with a branching point, the height of the branching point is determined by the slenderness ratio limit value, the four-way branched column structure body is connected to the cross-shaped steel member body at the branching point, and the upper steel beam is fixed to the cross-shaped steel member body through the four-way branched column structure body.

2. The four-way branched column structure of a cruciform-shaped cross-section steel member according to claim 1, characterized by: A center line passing through the center of the cover plate and being perpendicular to the ground is taken as a reference line, a branching angle is formed between the center line and the web of the adjacent I-shaped steel column, and the angle of the branching angle ranges from 22.5° to 45°.

3. The four-way branched column structure of a cruciform-shaped cross-section steel member according to claim 1, characterized by: A center line passing through the center of the platform of the biaxial web and being perpendicular to the ground is taken as a reference line, a branching angle is formed between the center line and the web of the adjacent T-shaped steel column, and the angle of the branching angle ranges from 22.5° to 45°.

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