System for improving comprehensive defense capability of beam-column semi-rigid connection based on bent angle steel

Abstract

The system comprises a square steel pipe column, a sleeve is connected to the outer side of the square steel pipe column in a sleeving mode, an opening is formed in the side wall of the sleeve, a connecting plate is fixed in the opening, the end of a steel beam is fixed to the connecting plate, and the end of the steel beam is fixed to the sleeve. The short limb end of the top bending angle steel, the short limb end of the bottom bending angle steel and the short limb end of the web bending angle steel are all fixed to the connecting plate through bolts, the long limb end of the top bending angle steel is fixed to the bottom of an upper flange in the steel beam through bolts, and the long limb end of the web bending angle steel is fixed to a web in the steel beam through bolts. The long limb end of the bottom bending angle steel is fixed to the upper portion of the middle lower flange of the steel beam through bolts. The system can improve the comprehensive defense capacity of beam column semi-rigid connection.

Description

Technical Field

[0001] The present invention belongs to the technical field of construction engineering and relates to a system for improving the comprehensive defense ability of semi-rigid beam-column connections based on bent angle steel. Background Art

[0002] With the rapid economic development and the accelerating urbanization process, high-rise buildings are emerging continuously in cities. The efficient use of land resources promotes the vertical development of buildings. With the development of building structures towards large-scale, complex and industrialized, at present, semi-rigid beam-column connections are usually adopted in multi-storey, high-rise and underground parking lots of high-rise structures. Due to the extensive use of semi-rigid beam-column connections, higher requirements and challenges are put forward for various performances of semi-rigid beam-column connections. Their safety under extreme conditions (such as explosion, impact, fire and earthquake, etc.) is facing challenges, which are mainly reflected in the insufficient deformation capacity of the joints, column bearing capacity and bolt deformation capacity under extreme loads. Therefore, it is necessary to improve or reinforce the semi-rigid beam-column connection joints to make them have better comprehensive defense ability. Summary of the Invention

[0003] The purpose of the present invention is to overcome the above-mentioned disadvantages of the prior art and provide a system for improving the comprehensive defense ability of semi-rigid beam-column connections based on bent angle steel, which can improve the comprehensive defense ability of semi-rigid beam-column connections.

[0004] To achieve the above purpose, the present invention discloses a system for improving the comprehensive defense ability of semi-rigid beam-column connections based on bent angle steel, including a square steel pipe column. A sleeve is sleeved outside the square steel pipe column. An opening is provided on the side wall of the sleeve, and a connecting plate is fixed in the opening. The end of a steel beam is fixed on the connecting plate. The short limb ends of the top bent angle steel, the bottom bent angle steel and the web bent angle steel are all fixed on the connecting plate by bolts. The long limb end of the top bent angle steel is fixed on the bottom of the upper flange of the steel beam by bolts. The long limb end of the web bent angle steel is fixed on the web of the steel beam by bolts. The long limb end of the bottom bent angle steel is fixed on the upper part of the lower flange of the steel beam by bolts.

[0005] Further, right-angle steels are provided between the top of the upper flange of the steel beam and the connecting plate and between the bottom of the lower flange of the steel beam and the connecting plate.

[0006] Further, two groups of fixing plates are fixed on the outer wall of the square steel pipe column by single-anchor high-strength bolts.

[0007] Further, the fixing plates are fixed on the outer wall of the square steel pipe column by single-anchor high-strength bolts.

[0008] Further, one group of fixing plates is located at the bottom of the sleeve, and the other group of fixing plates is located at the top of the sleeve.

[0009] Further, the fixing plates within the same group are sequentially distributed circumferentially.

[0010] Further, an octagonal hollow thin-walled column is arranged inside the square steel pipe column.

[0011] Further, several corrugated connecting plates are provided between the octagonal hollow thin-walled column and the inner wall of the square steel pipe column.

[0012] Further, the corrugated connecting plates are sequentially distributed circumferentially.

[0013] Further, let g1 be the distance from the center of the bolt hole at the short limb end of the top bent angle steel to the end of the top bent angle steel, g2 be the distance from the center of the bolt hole at the long limb end of the top bent angle steel to the end of the top bent angle steel, t a be the thickness of the top bent angle steel and the bottom bent angle steel, r a be the length of the arc at the long limb end of the top bent angle steel, s a be the distance from the bent part of the top bent angle steel to the end arc, w a be the width of the top bent angle steel, f a be the bending height of the top bent angle steel, l a be the bending length of the top bent angle steel, t b be the thickness of the web bent angle steel, r b be the length of the arc at the long limb end of the web bent angle steel, s b be the distance from the bent part of the web bent angle steel to the end arc, w b be the width of the web bent angle steel, f b be the bending height of the web bent angle steel, l b be the bending length of the web bent angle steel;

[0014] Then there are:

[0015] g1≥2d(1)

[0016] g2=5t a +2d(2)

[0017] t a =t(3)

[0018] r a =1.5t a (4)

[0019] s a =3t a (5)

[0020] w a =min{0.5w,0.5w bf -0.5t w}(6)

[0021]

[0022] l a = g2 - r a - s a - 2d(8)

[0023] t b ∈ {0.8t w , 1.2t w} (9)

[0024] r b = 1.5t b (10)

[0025] s b = 3t b (11)

[0026] w b ∈ {6d, h - 8d} (12)

[0027] l b = g2 - r b - s b - 2d(13)

[0028]

[0029]

[0030] d' C ≥ 0.045h(29)

[0031]

[0032] Wherein, d is the diameter of the bolt hole, t is the thickness of the angle steel, w is the width of the angle steel, w bf is the width of the middle flange of the steel beam, t w is the thickness of the middle web of the steel beam, h is the beam height of the steel beam, d' D ' is the deformation of the web bending angle steel, is the limit deformation of the web bending angle steel, d3' is the horizontal deformation at the bending position on the upper surface of the long limb end of the web bending angle steel, θ D is the ultimate rotation angle at the beam end when the tension side bending angle steel fractures, d3 is the horizontal deformation at the beam end when the bottom bending angle steel fractures, e is the translational deformation at the beam end, L is the beam length, d1' is the horizontal deformation at the bending position on the lower surface of the long limb end of the web bending angle steel, is the limit deformation of the top bending angle steel, d1 is the horizontal deformation at the beam end when the bottom bending angle steel fractures without the web bending angle steel, Δ D is the horizontal deformation at the midpoint of the beam end, d' Cis the deformation amount at the bending part on the lower surface of the long limb end of the bottom bending angle steel when the right-angle steel fractures, θ B is the ultimate rotation angle at the midpoint of the beam end. d'0 is the horizontal deformation amount at the bending part on the lower surface of the long limb end of the bottom bending angle steel when the right-angle steel fractures. d0 is the horizontal deformation amount of the beam end when the right-angle steel fractures. is the ultimate deformation amount of the outer side of the top bending angle steel, Δ T is the horizontal deformation amount of the beam end when the deflection at the mid-span of the beam reaches L / 20.

[0033] The present invention has the following beneficial effects:

[0034] When the system for enhancing the comprehensive defense ability of the beam-column semi-rigid connection based on the bending angle steel of the present invention is specifically operated, by adding top and bottom bending angle steels and web bending angle steels, the bending angle steels take over the load bearing after the failure of the connecting piece at the node, improving its bearing capacity and deformation ability, so as to achieve the purpose of improving the anti-collapse ability of the node under extreme load conditions, and improving the insufficient anti-collapse deformation ability of the node under fire and earthquake due to the fracture caused by the plastic hinge appearing at the root of the beam flange of the beam-column semi-rigid connection.

[0035] Furthermore, the bearing capacity and deformation ability under extreme load conditions are improved through the bolt sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0037] Figure 1 is the structural diagram of the present invention;

[0038] Figure 2 is the top view of the present invention;

[0039] Figure 3 is the structural diagram of the top bending angle steel in the present invention;

[0040] Figure 4 is the structural diagram of the web bending angle steel in the present invention;

[0041] Figure 5 is the structural diagram of the sleeve in the present invention;

[0042] Figure 6 is the structural diagram of the connecting plate 4 in the present invention;

[0043] Figure 7 is the structural diagram of the single-anchor high-strength bolt in the present invention;

[0044] Figure 8 is the structural diagram of the bolt sleeve;

[0045] Figure 9 It is the load-displacement curve graph of the beam-column connection joint under vertical load;

[0046] Figure 10 It is the load-displacement curve graph of the bolt under shear force;

[0047] Figure 11 It is the load-displacement curve graph of the bolt under tensile force.

[0048] Among them, 1 is the top bent angle steel, 2 is the web bent angle steel, 3 is the sleeve, 4 is the connecting plate, 5 is the single-anchor high-strength bolt, 6 is the corrugated connecting plate, 7 is the octagonal hollow thin-walled column, 8 is the opening joint, 9 is the bolt sleeve, 10 is the cone head, and 11 is the standard joint. Specific implementation manners

[0049] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0050] In the description of the present invention, it should be understood that the terms "include" and "comprise" indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their combinations.

[0051] It should also be understood that the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms.

[0052] It should be further understood that the term " / and" used in the specification of the present invention and the appended claims refers to any combination and all possible combinations of one or more of the related listed items, and includes these combinations. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present invention generally represents an "or" relationship between the front and rear related objects.

[0053] It should be understood that although terms such as first, second, and third may be used in the embodiments of the present invention to describe preset ranges and the like, these preset ranges should not be limited to these terms. These terms are only used to distinguish the preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0054] Depending on the context, the word "if" as used herein can be interpreted as "when" or "while" or "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrase "if determined" or "if detected (stated condition or event)" can be interpreted as "when determined" or "in response to determining" or "when detected (stated condition or event)" or "in response to detecting (stated condition or event)".

[0055] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components described and shown in the accompanying drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0056] Various structural schematic diagrams according to the disclosed embodiments of the present invention are shown in the drawings. These figures are not drawn to scale, where for the purpose of clear expression, some details are enlarged and some details may be omitted. The shapes of various regions and layers shown in the figures and their relative sizes and positional relationships are merely exemplary, and may actually deviate due to manufacturing tolerances or technical limitations, and those skilled in the art can design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0057] Embodiment 1

[0058] Reference Figures 1 to 7, the system for enhancing the comprehensive defense ability of beam-column semi-rigid connections based on bent angle steel according to the present invention includes a square steel pipe column, and a sleeve 3 is sleeved outside the square steel pipe column. An opening is provided on the side wall of the sleeve 3, and a connecting plate 4 is fixed in the opening. The end of the steel beam is welded to the connecting plate 4. Right-angle steels are provided between the top of the upper flange of the steel beam and the connecting plate 4 and between the bottom of the lower flange of the steel beam and the connecting plate 4. The short limb ends of the top bent angle steel 1, the bottom bent angle steel, and the web bent angle steel 2 are all fixed to the connecting plate 4 by bolts. The long limb end of the top bent angle steel 1 is fixed to the bottom of the upper flange in the steel beam by bolts. The long limb end of the web bent angle steel 2 is fixed to the web in the steel beam by bolts. The long limb end of the bottom bent angle steel is fixed to the upper part of the lower flange in the steel beam by bolts.

[0059] Two groups of fixing plates are fixed to the outer wall of the square steel pipe column by single-anchor high-strength bolts 5. Among them, one group of fixing plates is located at the bottom of the sleeve 3, and the other group of fixing plates is located at the top of the sleeve 3.

[0060] An octagonal hollow thin-walled column 7 is arranged inside the square steel pipe column, and a plurality of corrugated connecting plates 6 are provided between the octagonal hollow thin-walled column 7 and the inner wall of the square steel pipe column.

[0061] Let g1 be the distance from the center of the bolt hole on the short limb end of the top bent angle steel 1 to the end of the top bent angle steel 1, g2 be the distance from the center of the bolt hole on the long limb end of the top bent angle steel 1 to the end of the top bent angle steel 1, t a be the thickness of the top bent angle steel 1 and the bottom bent angle steel, r a be the length of the arc on the long limb end of the top bent angle steel 1, s a be the distance from the bending position on the top bent angle steel 1 to the end arc, w a be the width of the top bent angle steel 1, f a be the bending height of the top bent angle steel 1, l a be the bending length of the top bent angle steel 1, t b be the thickness of the web bent angle steel 2, r b be the length of the arc on the long limb end of the web bent angle steel 2, s b be the distance from the bending position on the web bent angle steel 2 to the end arc, w b be the width of the web bent angle steel 2, f b be the bending height of the web bent angle steel 2, l b be the bending length of the web bent angle steel 2.

[0062] Then it satisfies:

[0063] g1≥2d(1)

[0064] g2 = 5t a +2d(2)

[0065] t a = t(3)

[0066] r a = 1.5t a (4)

[0067] s a = 3t a (5)

[0068] w a = min{0.5w, 0.5w bf - 0.5t w}(6)

[0069]

[0070] l a = g2 - r a - s a - 2d(8)

[0071] t b ∈{0.8t w , 1.2t w}(9)

[0072] r b = 1.5t b (10)

[0073] s b = 3t b (11)

[0074] w b ∈{6d, h - 8d}(12)

[0075] l b = g2 - r b - s b - 2d(13)

[0076]

[0077] d' C ≥ 0.045h(29)

[0078]

[0079] Among them, d is the diameter of the bolt hole, t is the thickness of the angle steel; w is the width of the angle steel; w bf is the width of the middle flange of the steel beam; t w is the thickness of the middle web of the steel beam; h is the beam height of the steel beam; d' D ' is the deformation of the web bending angle steel 2; is the ultimate deformation of the web-bent angle steel 2; d3' is the horizontal deformation at the bending position on the upper surface of the long limb end of the web-bent angle steel 2; θ D is the ultimate rotation angle at the beam end when the tension-side bent angle steel fractures; d3 is the horizontal deformation at the beam end when the bottom bent angle steel fractures; e is the translational deformation at the beam end; L is the beam length; d1' is the horizontal deformation at the bending position on the lower surface of the long limb end of the web-bent angle steel 2; is the ultimate deformation of the top bent angle steel 1; d1 is the horizontal deformation at the beam end when the bottom bent angle steel fractures without the web-bent angle steel 2; Δ D is the horizontal deformation at the midpoint of the beam end; d' C is the deformation at the bending position on the lower surface of the long limb end of the bottom bent angle steel when the right-angle steel fractures; θ B is the ultimate rotation angle at the midpoint of the beam end; d'0 is the horizontal deformation at the bending position on the lower surface of the long limb end of the bottom bent angle steel when the right-angle steel fractures; d0 is the horizontal deformation at the beam end when the right-angle steel fractures; is the ultimate deformation of the outer side of the top bent angle steel 1; Δ T is the horizontal deformation at the beam end when the deflection at the mid-span of the beam reaches L / 20.

[0080] Example Two

[0081] The design method of the system for enhancing the comprehensive defense ability of beam-column semi-rigid connections based on bent angle steel according to the present invention includes the following steps:

[0082] 1) Determine the parameters g1, t a , r a , s a , w a , t b , r b , s b , and w b through equations (1), (3), (4), (5), (6), (9), (10), (11), and (12);

[0083] 2) Initially determine the parameter g2 through equation (2), obtain the length l a of the top and bottom bent angle steels according to equation (8), and select the height f a of the bent angle steel according to equation (7);

[0084] 3) According to the parameter g2, obtain the deformation requirement of the tension-side bent angle steel from equations (24), (25), and (26), and then substitute it into equation (27). When F(f a ) = 0, then output f a , otherwise, reselect f a , until F(f a ) = 0;

[0085] 4) Substitute the f obtained in step 3) a into equations (29) and (30) to determine whether the joint meets the deformation requirements of the structure under fire resistance and seismic resistance. If it meets, output f b and l b . If it does not meet, reselect f b and l b , and then go back to step 3);

[0086] 5) Calculate the ultimate rotation angle θ of the joint through equations (16) and (17) D ;

[0087] 6) Substitute the ultimate rotation angle θ D into equation (27) to obtain the deformation d of the web bent angle steel 2 D . Then calculate the height f of the web bent angle steel 2 according to equation (14) b .

[0088] Embodiment 3

[0089] A computer device includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps of the design method of the system for enhancing the comprehensive defense ability of the beam-column semi-rigid connection based on the bent angle steel. Among them, the memory may include internal memory, such as high-speed random access memory, and may also include non-volatile memory, such as at least one disk memory, etc.; the processor, network interface, and memory are interconnected through an internal bus, and this internal bus can be an Industry Standard Architecture bus, a Peripheral Component Interconnect standard bus, an Extended Industry Standard Architecture bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. The memory is used to store programs. Specifically, the program can include program code, and the program code includes computer operation instructions. The memory can include internal memory and non-volatile memory and provide instructions and data to the processor.

[0090] Embodiment 4

[0091] A computer-readable storage medium stores a computer program. When the computer program is executed by a processor, it implements the steps of the design method of the system for enhancing the comprehensive defense ability of the beam-column semi-rigid connection based on the bent angle steel. Specifically, the computer-readable storage medium includes but is not limited to, for example, volatile memory and / or non-volatile memory. The volatile memory can include random access memory (RAM) and / or cache memory, etc. The non-volatile memory can include read-only memory (ROM), hard disk, flash memory, optical disc, magnetic disk, etc.

[0092] Those skilled in the art should understand that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0093] The present application is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, as well as the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0094] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including instruction means that implement the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0095] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are performed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0096] After considering the specification and the disclosure of the invention, those skilled in the art will readily conceive of other embodiments of the present invention. The present application is intended to cover any variations, uses, or adaptations of the present invention, which follow the general principles of the present invention and include known common knowledge or conventional technical means in the technical field not disclosed by the present invention. The specification and the embodiments are only regarded as exemplary, and the true scope and spirit of the present invention are pointed out by the following claims.

[0097] It should be understood that the present invention is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present invention is only limited by the appended claims.

[0098] The above are only preferred embodiments of the present invention, and do not impose any limitations on the present invention. Any simple modifications, changes, and equivalent structural changes made to the above embodiments according to the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A system based on bending angle steel to improve the comprehensive defense capability of semi-rigid connection of beams and columns, characterized in that: It comprises a square steel pipe column, the outer side of which is sleeved with a sleeve (3), the side wall of the sleeve (3) is open, a connecting plate (4) is fixed in the opening, the end of the steel beam is fixed on the connecting plate (4), the short limbs of the top bending angle steel (1), the short limbs of the bottom bending angle steel and the short limbs of the web bending angle steel (2) are all fixed to the connecting plate (4) by bolts, the long limbs of the top bending angle steel (1) are fixed to the bottom of the upper flange of the steel beam by bolts, the long limbs of the web bending angle steel (2) are fixed to the web of the steel beam by bolts, and the long limbs of the bottom bending angle steel are fixed to the upper part of the lower flange of the steel beam by bolts.

2. The system for improving the comprehensive defense capability of semi-rigid connection of beams and columns based on bent angle steel according to claim 1 is characterized in that: Right-angle steels are arranged between the top of the upper flange of the steel beam and the connecting plate (4), and between the bottom of the lower flange of the steel beam and the connecting plate (4).

3. The system for improving the comprehensive defense capability of semi-rigid connection of beams and columns based on bent angle steel according to claim 1 is characterized in that: Two groups of fixing plates are fixed on the outer wall of the square steel pipe column by means of single-anchor high-strength bolts (5).

4. The system for improving the comprehensive defense capability of semi-rigid connection of beams and columns based on bent angle steel according to claim 3 is characterized in that: The fixing plate is fixed to the outer wall of the square steel pipe column by means of a single-anchor high-strength bolt (5).

5. The system for improving the comprehensive defense capability of semi-rigid connection of beams and columns based on bent angle steel according to claim 4 is characterized in that: One set of fixing plates is located at the bottom of the sleeve (3), and the other set of fixing plates is located at the top of the sleeve (3).

6. The system for improving the comprehensive defense capability of semi-rigid connection of beams and columns based on bent angle steel according to claim 5 is characterized in that: The fixing plates in the same group of fixing plates are sequentially distributed along the circumferential direction.

7. The system for improving the comprehensive defense capability of semi-rigid connection of beams and columns based on bent angle steel according to claim 1 is characterized in that: An octagonal hollow thin-walled column (7) is arranged inside the square steel tube column.

8. The system for improving the comprehensive defense capability of semi-rigid connection of beams and columns based on bent angle steel according to claim 7 is characterized in that: A plurality of wave-shaped connecting plates (6) are provided between the octagonal hollow thin-walled column (7) and the inner wall of the square steel tube column.

9. The system for improving the comprehensive defense capability of semi-rigid connection of beams and columns based on bent angle steel according to claim 8 is characterized in that: The wave-shaped connecting plates (6) are distributed in sequence along the circumferential direction.

10. The system for improving the comprehensive defense capability of semi-rigid connection of beams and columns based on bent angle steel according to claim 1 is characterized in that: Assume that g1 is the distance from the center of the bolt hole on the short limb of the top bending angle steel (1) to the end of the top bending angle steel (1), g2 is the distance from the center of the bolt hole on the long limb of the top bending angle steel (1) to the end of the top bending angle steel (1), t a is the thickness of the top bending angle steel (1) and the bottom bending angle steel, r a is the length of the arc at the long end of the top bent angle steel (1), s a w is the distance between the upper bend of the top bend angle steel (1) and the end arc, a is the width of the top bending angle steel (1), f a is the bending height of the top bending angle steel (1), l a is the bending length of the top bending angle steel (1), t b is the thickness of the web bending angle steel (2), r b is the length of the arc at the long end of the web bent angle steel (2), s b w is the distance between the upper bend of the web bent angle steel (2) and the end arc, b is the width of the web bending angle (2), f b is the bending height of the web bending angle steel (2), l b is the bending length of the web bending angle steel (2); Then we have: g1≥2d(1) g2=5t a +2d(2) t a =t(3) r a ＝1.5t a (4) s a =3t a (5) w a =min{0.5w,0.5w bf -0.5t w }(6) l a =g2-r a -s a -2d(8) t b ∈{0.8t w ,1.2t w }(9) r b ＝1.5t b (10) s b =3t b (11) <h2 style=";text-align:left;direction:ltr">w<h2 style=";text-align:left;direction:ltr"> b <h2 style=";text-align:left;direction:ltr"> ∈{6d,h-8d}(12) l b =g2-r b -s b -2d(13) d' C ≥0.045h(29) Where, d is the bolt hole diameter, t is the thickness of the right angle steel, w is the width of the right angle steel, and w bf is the width of the flange in the steel beam, t w is the thickness of the web in the steel beam, h is the height of the steel beam, d″ D is the deformation of the web bending angle steel (2), is the limit deformation of the web bending angle steel (2), d3' is the horizontal deformation of the upper surface of the long limb end of the web bending angle steel (2), θ D is the limit rotation angle of the beam end when the bending angle steel on the tension side breaks, d3 is the horizontal deformation of the beam end when the bottom bending angle steel breaks, e is the translational deformation of the beam end, L is the beam length, d1' is the horizontal deformation of the lower surface of the long limb end of the web bending angle steel (2), is the limit deformation of the top bending angle steel (1), d1 is the horizontal deformation of the beam end when the bottom bending angle steel breaks when there is no web bending angle steel (2), Δ D is the horizontal deformation of the midpoint of the beam end, d' C is the deformation of the lower surface of the long limb of the bottom bending angle steel when the right angle steel breaks, θ B is the limit rotation angle of the midpoint of the beam end, d'0 is the horizontal deformation of the lower surface of the long limb end of the bottom bending angle steel when the right angle steel breaks, d0 is the horizontal deformation of the beam end when the right angle steel breaks, is the limit deformation of the outer side of the top bending angle steel (1), Δ T It is the horizontal deformation at the beam end when the mid-span deflection of the beam reaches L / 20.

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