XIE beam

Abstract

This invention discloses an XIE beam, comprising a box girder body, which is formed by an upper panel (1), a left web (2), a lower panel (3), and a right web (4). Inside the box girder body are scissor bracing plates (6) and horizontal steel plates (5). The two ends of the horizontal steel plates (5) are connected to the longitudinal midpoints of the left web (2) and the right web (4), respectively. The midpoint of the scissor bracing plates (6) is located at the transverse midpoint of the horizontal steel plates (5). The upper ends of the scissor bracing plates (6) are connected to the longitudinal 1 / 4 points of the left web (2) and the right web (4), respectively, and the lower ends of the scissor bracing plates (6) are connected to the longitudinal 3 / 4 points of the left web (2) and the right web (4), respectively. Compared to traditional box-section beams of the same area, the XIE beam significantly increases the bending stiffness EI without causing web instability.

Description

Technical Field

[0001] This invention belongs to the field of steel box girder technology, and specifically relates to an XIE beam. Background Technology

[0002] Steel structure bridges are bridges whose main load-bearing structure is made of steel. The main design concept of steel structure bridges is to assemble a prefabricated steel bridge capable of bearing various loads and spans using a minimal number of unit components. They can be transported by medium-sized trucks, and in special circumstances, can be entirely constructed manually. Steel box girders, also called steel plate box girders, are a common structural form for long-span bridges. They are generally used on bridges with large spans and are called steel box girders because of their box-like shape. Steel box girders are constructed by welding multiple steel plates to form a box structure. During long-term use, under various tensile and compressive forces, stress deformation occurs between the left and right sides of the steel box girder. According to mechanics of materials, the shear stress distribution of traditional box girder sections is uneven, with the maximum shear stress located at its neutral axis. Therefore, the middle of the web of the box girder section is prone to warping and instability. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing an XIE beam. The basic structure of the XIE beam is based on a traditional box girder, with a shear bracing steel plate added in the middle, resembling an "X" in shape; and a horizontal steel plate added at the intersection of the shear bracing, resembling an "I" rotated 90°; the two combined form a shape composed of two opposing "E"s, hence the name "XIE beam". Compared to a traditional box girder of the same area, the XIE beam significantly increases the bending stiffness EI without causing web instability.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] An XIE beam includes a box girder body, which is formed by a top panel, a left web, a bottom panel, and a right web. Inside the box girder body, there are scissor bracing steel plates (X-shaped steel plates) and horizontal steel plates. The two ends of the horizontal steel plates are connected to the longitudinal midpoints of the left and right webs, respectively. The midpoint of the scissor bracing steel plates is located at the transverse midpoint of the horizontal steel plates. The upper two ends of the scissor bracing steel plates are connected to the longitudinal 1 / 4 points of the left and right webs, respectively, and the lower two ends are connected to the longitudinal 3 / 4 points of the left and right webs, respectively.

[0006] As a further improvement to the aforementioned XIE beam, a vertical steel plate is also included; the lower end of the vertical steel plate is connected to the transverse midpoint of the horizontal steel plate, and the upper end is connected to the transverse midpoint of the upper panel.

[0007] The present invention also provides another structural arrangement of the XIE beam: an XIE beam including a box girder body, the box girder body being formed by a top panel, a left web, a bottom panel, and a right web; wherein: a scissor bracing steel plate and a horizontal steel plate are provided inside the box girder body; the horizontal steel plate is provided in two pieces, one of which is connected at both ends to the longitudinal 1 / 3 point of the left web and the longitudinal 1 / 3 point of the right web respectively, and the other is connected at both ends to the longitudinal 2 / 3 point of the left web and the longitudinal 2 / 3 point of the right web respectively; the upper two ends of the scissor bracing steel plate are connected to the longitudinal 1 / 3 point of the left web and the longitudinal 1 / 3 point of the right web respectively, and the lower two ends of the scissor bracing steel plate are connected to the longitudinal 2 / 3 point of the left web and the longitudinal 2 / 3 point of the right web respectively.

[0008] The present invention also provides another structural arrangement of XIE beams: an XIE beam including a box girder body, the box girder body being formed by a top panel, a left web, a bottom panel, and a right web; wherein: scissor bracing steel plates and horizontal steel plates are provided inside the box girder body; two horizontal steel plates are provided, one of which is connected at both ends to the longitudinal 1 / 3 points of the left web and the longitudinal 1 / 3 points of the right web respectively, and the other is connected at both ends to the longitudinal 2 / 3 points of the left web and the longitudinal 2 / 3 points of the right web respectively; two scissor bracing steel plates are provided, arranged side by side between the two horizontal steel plates.

[0009] The present invention also provides another structural arrangement of XIE beams: an XIE beam including a box girder body, the box girder body being formed by a top panel, a left web, a bottom panel, and a right web; wherein: diagonal bracing steel plates and horizontal steel plates are provided inside the box girder body; the two ends of the horizontal steel plates are respectively connected to the longitudinal 2 / 3 points of the left web and the longitudinal 2 / 3 points of the right web; two diagonal bracing steel plates are provided, and the lower ends of both are connected to the transverse midpoint of the horizontal steel plates, and the upper ends are respectively connected to the longitudinal 1 / 3 points of the left web and the longitudinal 1 / 3 points of the right web.

[0010] As a further improvement to the aforementioned XIE beam, a vertical steel plate is also included; the lower end of the vertical steel plate is connected to the transverse midpoint of the horizontal steel plate, and the upper end is connected to the transverse midpoint of the upper panel.

[0011] This invention also provides another structural arrangement of the XIE beam: an XIE beam comprising a box girder body, the box girder body being formed by an upper panel, a left web, a lower panel, and a right web; wherein: diagonal bracing plates and horizontal steel plates are provided inside the box girder body; the two ends of the horizontal steel plates are respectively connected to the longitudinal midpoint of the left web and the longitudinal midpoint of the right web; four diagonal bracing plates are provided, and two diagonal bracing plates are arranged on the upper and lower sides of the horizontal steel plates respectively; the lower ends of the two diagonal bracing plates on the upper side of the horizontal steel plates are respectively connected to the transverse 1 / 3 point and 2 / 3 point of the horizontal steel plate, and the upper ends are respectively connected to the longitudinal 1 / 4 point of the left web and the longitudinal 1 / 4 point of the right web; the upper ends of the two diagonal bracing plates on the lower side of the horizontal steel plates are respectively connected to the transverse 1 / 3 point and 2 / 3 point of the horizontal steel plate, and the lower ends are respectively connected to the longitudinal 1 / 4 point of the left web and the longitudinal 1 / 4 point of the right web.

[0012] The present invention also provides another structural arrangement of XIE beams: an XIE beam including a box girder body, the box girder body being formed by a top panel, a left web, a bottom panel, and a right web; wherein: a scissor bracing steel plate is provided inside the box girder body; the upper two ends of the scissor bracing steel plate are respectively connected to the top ends of the left web and the right web, and the lower two ends of the scissor bracing steel plate are respectively connected to the bottom ends of the left web and the right web.

[0013] The present invention also provides another structural arrangement of the XIE beam: an XIE beam consisting of an upper panel, a lower panel, and a shear bracing steel plate; the upper two ends of the shear bracing steel plate are respectively connected to the two ends of the upper panel, and the lower two ends of the shear bracing steel plate are respectively connected to the two ends of the lower panel.

[0014] Advantages of this invention:

[0015] The present invention has a simple structure and stable performance; compared with the traditional box section beam with the same area, the XIE beam can significantly increase the bending stiffness EI without causing web instability. Attached Figure Description

[0016] Figure 1 This is a cross-sectional structural diagram of Embodiment 1 of the present invention.

[0017] Figure 2 This is a cross-sectional structural diagram of Embodiment 2 of the present invention.

[0018] Figure 3 This is a cross-sectional structural diagram of Embodiment 3 of the present invention.

[0019] Figure 4 This is a cross-sectional structural diagram of Embodiment 4 of the present invention.

[0020] Figure 5 This is a cross-sectional structural diagram of Embodiment 5 of the present invention.

[0021] Figure 6 This is a cross-sectional structural diagram of Embodiment 6 of the present invention.

[0022] Figure 7 This is a cross-sectional structural diagram of Embodiment 7 of the present invention.

[0023] Figure 8 This is a three-dimensional structural schematic diagram of Embodiment 1 of the present invention.

[0024] Figure 9 This is a schematic diagram of the stroke process of the XIE beam in Embodiment 1 of the present invention.

[0025] Figure 10 This is a force diagram of the isolated body E1 in Embodiment 1 of the present invention.

[0026] Figure 11 This is a schematic diagram of the forces acting on the isolator O in Embodiment 1 of the present invention.

[0027] Figure 12 This is a bending and shear deformation diagram of the horizontal steel plate EF in Embodiment 1 of the present invention.

[0028] Figure 13 This is a table of XIE beam section parameters in application example 1 of the present invention.

[0029] Figure 14 This is a table of cross-sectional parameters for the comparative example (traditional box type) in application example 1 of the present invention.

[0030] Figure 15 This is a comparison diagram of the moment of inertia of the XIE beam in Application Example 1 of this invention and the comparative example (traditional box beam).

[0031] Figure 16 This is a table of XIE beam section parameters in application example 2 of the present invention.

[0032] Figure 17 This is a table of cross-sectional parameters for the comparative example (traditional box type) in application example 2 of the present invention.

[0033] Figure 18 This is a comparison diagram of the moment of inertia of the XIE beam in application example 2 of this invention and the comparative example (traditional box beam).

[0034] Figure 19 This is a cross-sectional structural diagram of Embodiment 8 of the present invention.

[0035] Figure 20 This is a cross-sectional structural diagram of Embodiment 9 of the present invention.

[0036] Attached reference numerals: 1-Top panel, 2-Left web, 3-Lower panel, 4-Right web, 5-Horizontal steel plate, 6-Scissor brace steel plate, 7-Vertical steel plate, 8-Diagonal brace steel plate. Implementation

[0037] The invention will be further described below with reference to the accompanying drawings. Example

[0038] like Figure 1 As shown, an XIE beam includes a box girder body, which is formed by an upper panel 1, a left web 2, a lower panel 3, and a right web 4. Inside the box girder body, there are shear bracing steel plates 6 and horizontal steel plates 5. The two ends of the horizontal steel plates 5 are connected to the longitudinal midpoints of the left web 2 and the right web 4, respectively. The midpoint of the shear bracing steel plates 6 is located at the transverse midpoint of the horizontal steel plates 5. The upper two ends of the shear bracing steel plates 6 are connected to the longitudinal 1 / 4 points of the left web 2 and the right web 4, respectively, and the lower two ends of the shear bracing steel plates 6 are connected to the longitudinal 3 / 4 points of the left web 2 and the right web 4, respectively. Example

[0039] like Figure 2 As shown, an XIE beam includes a box girder body, which is formed by an upper panel 1, a left web 2, a lower panel 3, and a right web 4. Inside the box girder body, there are scissor bracing steel plates 6 and horizontal steel plates 5. The two ends of the horizontal steel plates 5 are connected to the longitudinal midpoints of the left web 2 and the right web 4, respectively. The midpoint of the scissor bracing steel plates 6 is located at the transverse midpoint of the horizontal steel plates 5. The upper two ends of the scissor bracing steel plates 6 are connected to the longitudinal 1 / 4 points of the left web 2 and the right web 4, respectively, and the lower two ends are connected to the longitudinal 3 / 4 points of the left web 2 and the right web 4, respectively. The XIE beam also includes a vertical steel plate 7; the lower end of the vertical steel plate 7 is connected to the transverse midpoint of the horizontal steel plate 5, and the upper end is connected to the transverse midpoint of the upper panel 1. Example

[0040] like Figure 3 As shown, an XIE beam includes a box girder body, which is formed by an upper panel 1, a left web 2, a lower panel 3, and a right web 4. Inside the box girder body, there are shear bracing steel plates 6 and horizontal steel plates 5. Two horizontal steel plates 5 are provided; one horizontal steel plate has its two ends connected to the longitudinal 1 / 3 points of the left web 2 and the right web 4, respectively, and the other horizontal steel plate has its two ends connected to the longitudinal 2 / 3 points of the left web 2 and the right web 4, respectively. The upper two ends of the shear bracing steel plate 6 are connected to the longitudinal 1 / 3 points of the left web 2 and the right web 4, respectively, and the lower two ends of the shear bracing steel plate 6 are connected to the longitudinal 2 / 3 points of the left web 2 and the right web 4, respectively. Example

[0041] like Figure 4As shown, an XIE beam includes a box girder body, which is formed by an upper panel 1, a left web 2, a lower panel 3, and a right web 4. Inside the box girder body, there are shear bracing steel plates 6 and horizontal steel plates 5. Two horizontal steel plates 5 are provided; one horizontal steel plate has its two ends connected to the longitudinal 1 / 3 points of the left web 2 and the longitudinal 1 / 3 points of the right web 4, respectively, and the other horizontal steel plate has its two ends connected to the longitudinal 2 / 3 points of the left web 2 and the longitudinal 2 / 3 points of the right web 4, respectively. Two shear bracing steel plates 6 are provided and arranged side-by-side between the two horizontal steel plates. Example

[0042] like Figure 5 As shown, an XIE beam includes a box girder body, which is formed by an upper panel 1, a left web 2, a lower panel 3, and a right web 4. Inside the box girder body, there are diagonal bracing steel plates 8 and horizontal steel plates 5. The two ends of the horizontal steel plates 5 are connected to the longitudinal 2 / 3 points of the left web 2 and the longitudinal 2 / 3 points of the right web 4, respectively. Two diagonal bracing steel plates 8 are provided, with their lower ends connected to the transverse midpoint of the horizontal steel plates 5, and their upper ends connected to the longitudinal 1 / 3 points of the left web 2 and the longitudinal 1 / 3 points of the right web 4, respectively. Example

[0043] like Figure 6 As shown, an XIE beam includes a box girder body, which is formed by an upper panel 1, a left web 2, a lower panel 3, and a right web 4. Inside the box girder body, there are diagonal bracing plates 8 and horizontal steel plates 5. The two ends of the horizontal steel plates 5 are connected to the longitudinal 2 / 3 points of the left web 2 and the longitudinal 2 / 3 points of the right web 4, respectively. Two diagonal bracing plates 8 are provided, with their lower ends connected to the transverse midpoint of the horizontal steel plates 5, and their upper ends connected to the longitudinal 1 / 3 points of the left web 2 and the longitudinal 1 / 3 points of the right web 4, respectively. The XIE beam also includes a vertical steel plate 7; the lower end of the vertical steel plate 7 is connected to the transverse midpoint of the horizontal steel plate 5, and its upper end is connected to the transverse midpoint of the upper panel 1. Example

[0044] like Figure 7As shown, an XIE beam includes a box girder body, which is formed by an upper panel 1, a left web 2, a lower panel 3, and a right web 4. Inside the box girder body, there are diagonal bracing plates 8 and horizontal steel plates 5. The two ends of the horizontal steel plates 5 are connected to the longitudinal midpoints of the left web 2 and the right web 4, respectively. Four diagonal bracing plates 8 are provided, with two plates arranged on the upper and lower sides of the horizontal steel plates 5. The lower ends of the two diagonal bracing plates 8 on the upper side of the horizontal steel plate 5 are connected to the transverse 1 / 3 and 2 / 3 points of the horizontal steel plate 5, respectively, and their upper ends are connected to the longitudinal 1 / 4 points of the left web 2 and the right web 4, respectively. The upper ends of the two diagonal bracing plates 8 on the lower side of the horizontal steel plate 5 are connected to the transverse 1 / 3 and 2 / 3 points of the horizontal steel plate 5, respectively, and their lower ends are connected to the longitudinal 1 / 4 points of the left web 2 and the right web 4, respectively. Example

[0045] like Figure 19 As shown, an XIE beam includes a box girder body, which is formed by an upper panel 1, a left web 2, a lower panel 3, and a right web 4. Inside the box girder body, there is a shearing brace steel plate 6. The upper two ends of the shearing brace steel plate 6 are connected to the top ends of the left web 2 and the right web 4, respectively, and the lower two ends of the shearing brace steel plate 6 are connected to the bottom ends of the left web 2 and the right web 4, respectively. Example

[0046] like Figure 20 As shown, an XIE beam is composed of an upper panel 1, a lower panel 3, and a shearing brace steel plate 6; the upper two ends of the shearing brace steel plate 6 are respectively connected to the two ends of the upper panel 1, and the lower two ends of the shearing brace steel plate 6 are respectively connected to the two ends of the lower panel 3.

[0047] The following is an analysis of the mechanical principles of the XIE beam:

[0048] (1) Based on the principles of structural mechanics, a horizontal plate is set to reduce web deformation.

[0049] According to the principle of symmetry in structural mechanics, when the structure, forces, and constraints are all symmetrical, the deformation will necessarily be symmetrical. Therefore, a horizontal plate EF is placed between points EF. Figure 1 This constrains points E and F, thereby reducing the deformation of both points.

[0050] (2) Based on the principle of linear stiffness, scissor bracing is installed to further reduce web deformation.

[0051] To increase the aspect ratio and height-to-thickness ratio, the AE, EB, DF, and FC segments are longer, making them prone to web warping and instability. According to the principle of linear stiffness, reducing their free length l can increase their k-value. Therefore, shear braces E1OF1 and E2OF2 (with O as a common point) are added at the midpoint O of EF, effectively improving the web's resistance to deformation and significantly enhancing stability.

[0052] The following is the working mechanism of the XIE beam:

[0053] Take the isolation body E1 as follows Figure 10 As shown, this location is subjected to axial force and shear force, thus resulting in axial and shear deformation; then consider the isolated body O as... Figure 11 As shown, the area is primarily subjected to bending and shear, thus bending-shear deformation occurs. Therefore, the shear deformation of the web first transforms into the axial deformation and shear deformation of other components, and then into the bending-shear deformation of the horizontal equilibrium plate (such as...). Figure 12 As shown in the figure, this is the working mechanism of the XIE beam.

[0054] This invention also defines a section parameter for XIE beam structures. (i.e., the increase in cross-sectional bending strength):

[0055] In the formula:

[0056] I – Moment of inertia of the cross section, typically in mm. 4 or m 4 ;

[0057] t—web thickness, usually in mm or m;

[0058] b — Cross-sectional width, usually in mm or m;

[0059] A – Cross-sectional area, usually in mm² 2 or m 2 .

[0060] Its physical meaning is: when A is constant, by reducing t or b, or both tb, the purpose of I can be increased. That is, increasing I under the same A, thereby enhancing the bending resistance of the beam.

[0061] Application Example 1:

[0062] like Figure 13 , 14 As shown, taking an XIE beam section with b×h=200mm×500mm (except for the upper and lower flanges which are 3mm thick, the rest are 1mm thick) as an example, the moment of inertia (I in the figure) of a traditional box section of 250mm×150mm×4mm with the same material and similar area is compared with that of a box section of similar size. yy The results are compared. Figure 15As shown, the bending moment of inertia of the XIE beam is 3.6 times greater than that of a traditional box section with a similar area, and the bending stiffness is significantly improved.

[0063] Application Example 2:

[0064] like Figure 16 , 17 As shown, taking an XIE section with b×h=200mm×500mm (thickness condition as above) as an example, the moment of inertia (I in the figure) of a traditional box section of the same material and with a similar area of ​​220mm×140mm×4mm is... yy The results are compared. Figure 18 As shown, the bending moment of inertia of the XIE beam is 5.2 times greater than that of a traditional box section with a similar area, and the bending stiffness is significantly improved.

[0065] Obviously, the above embodiments are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will recognize that other variations or modifications can be made based on the above description; it is neither necessary nor possible to exhaustively list all possible implementations; however, obvious variations or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. An XIE beam, which is based on a traditional box beam, a scissors steel plate is added in the middle part, the outer shape is like "X", and a horizontal steel plate is added at the intersection of the scissors, the outer shape is like a "I" rotated by 90°, and the combination of the two forms the basic structure of the figure composed of two positive and negative "E"s; specifically comprising a box beam body, the box beam body is surrounded by an upper panel (1), a left web plate (2), a lower panel (3), and a right web plate (4); characterized in that: The box girder body is internally provided with a scissors brace steel plate (6) and a horizontal steel plate (5); the two ends of the horizontal steel plate (5) are respectively connected with the longitudinal midpoint of the left web plate (2) and the longitudinal midpoint of the right web plate (4); the middle intersection point of the scissors brace steel plate (6) is located at the horizontal steel plate (5) transverse midpoint, the upper two ends of the scissors brace steel plate (6) are respectively connected with the longitudinal 1 / 4 point of the left web plate (2) and the longitudinal 1 / 4 point of the right web plate (4), and the lower two ends of the scissors brace steel plate (6) are respectively connected with the longitudinal 3 / 4 point of the left web plate (2) and the longitudinal 3 / 4 point of the right web plate (4).

2. The XIE beam of claim 1, wherein: The vertical steel plate (7) is further included; the lower end of the vertical steel plate (7) is connected with the horizontal steel plate (5) transverse midpoint, and the upper end is connected with the upper plate (1) transverse midpoint.

3. An XIE beam, which is based on a traditional box beam, increases a scissors support steel plate in the middle, which is like an "X", and adds a horizontal steel plate at the intersection of the scissors support, which is like a 90° rotated "I", and the basic structure of the combination of the two is a figure composed of two positive and negative "E"s; specifically comprising a box beam body, the box beam body is surrounded by an upper panel (1), a left web plate (2), a lower panel (3), and a right web plate (4); characterized in that: The box girder body is internally provided with a diagonal brace steel plate (8) and a horizontal steel plate (5); the two ends of the horizontal steel plate (5) are respectively connected with the longitudinal midpoint of the left web plate (2) and the longitudinal midpoint of the right web plate (4); the diagonal brace steel plate (8) is provided with four pieces, and two pieces of the diagonal brace steel plate are arranged on the upper and lower sides of the horizontal steel plate (5); the lower ends of the two pieces of the diagonal brace steel plate (8) on the upper side of the horizontal steel plate (5) are respectively connected with the horizontal steel plate (5) 1 / 3 point and 2 / 3 point, and the upper ends are respectively connected with the longitudinal 1 / 4 point of the left web plate (2) and the longitudinal 1 / 4 point of the right web plate (4); the upper ends of the two pieces of the diagonal brace steel plate (8) on the lower side of the horizontal steel plate (5) are respectively connected with the horizontal steel plate (5) 1 / 3 point and 2 / 3 point, and the lower ends are respectively connected with the longitudinal 1 / 4 point of the left web plate (2) and the longitudinal 1 / 4 point of the right web plate (4).

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