System for improving progressive collapse resistance of T-shaped connecting steel structure based on V-shaped layered plates

Abstract

The system comprises a steel column, a first H-shaped steel beam, a second H-shaped steel beam and four connecting pieces, each connecting piece comprises a clamping plate and two V-shaped plates, and the ends of the two V-shaped plates are welded to the clamping plates; the steel column is H-shaped steel, and a flange of the steel column is connected with the first H-shaped steel beam through a first connecting piece and a second connecting piece; and the steel column is connected with the second H-shaped steel beam through a third connecting piece, a fourth connecting piece and an overhanging beam. According to the system, the progressive collapse resistance of the T-shaped connecting steel structure can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of building engineering, and relates to a system for improving the progressive collapse resistance of a T-shaped connection structure based on a V-shaped layered plate. Background Art

[0002] The efficient use of land resources has promoted the vertical development of buildings. Steel structures have been widely used in load-bearing structures of high-rise buildings due to their advantages such as short construction period and light weight. However, their safety in complex environments faces challenges, and the problem of progressive collapse has gradually attracted attention. As a key research object in the study of anti-progressive collapse, beam-column nodes have always attracted much attention. Among them, traditional T-type connection nodes, as typical semi-rigid nodes, have been widely used in steel structure buildings. However, due to the insufficient bearing capacity and rotation capacity of the T-shaped member, the ability to resist progressive collapse is insufficient. Therefore, it is necessary to improve or reinforce the T-type connection node so that it has better resistance to progressive collapse. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a system for improving the progressive collapse resistance of T-connected steel structures based on V-shaped layered plates. The system can improve the progressive collapse resistance of T-connected steel structures.

[0004] To achieve the above object, the present invention discloses a system for improving the anti-continuous collapse capability of a T-connected steel structure based on a V-shaped layered plate, comprising a steel column, a first H-shaped steel beam, a second H-shaped steel beam and four connecting members, wherein the connecting members comprise a clamping plate and two V-shaped plates, and the ends of the two V-shaped plates are welded to the clamping plate;

[0005] The steel column is an H-shaped steel, and the flange of the steel column is connected to the first H-shaped steel beam through a first connecting piece and a second connecting piece;

[0006] The steel column and the second H-shaped steel beam are connected via a third connecting piece, a fourth connecting piece and an outrigger beam.

[0007] The first connecting member and the second connecting member are respectively located on both sides of the web of the first H-shaped steel beam, a V-shaped plate in the first connecting member and a V-shaped plate in the second connecting member are both located at the bottom of the upper flange of the first H-shaped steel beam and are connected to the upper flange through a first set of bolts, another V-shaped plate in the first connecting member and another V-shaped plate in the second connecting member are both located on the upper part of the lower flange of the first H-shaped steel beam and are connected to the lower flange through a second set of bolts, and the clamping plate in the first connecting member and the clamping plate in the second connecting member are both connected to the flange of the steel column through a third set of bolts.

[0008] The outrigger beam is an I-beam structure.

[0009] An outrigger is provided between the two flanges of the steel column, wherein the third connecting member is located on one side of the web of the second H-shaped steel beam, and the fourth connecting member is located on the other side of the web of the second H-shaped steel beam, a V-shaped plate in the third connecting member, a V-shaped steel plate in the fourth connecting member, the upper flange of the second H-shaped steel beam and the upper flange of the outrigger are connected by a fourth group of bolts, another V-shaped plate in the third connecting member, another V-shaped plate in the fourth connecting member, the lower flange of the second H-shaped steel beam and the lower flange of the outrigger are connected by a fifth group of bolts, the splint in the third connecting member, the web of the outrigger beam and the web of the steel column are connected by a sixth group of bolts, and the splint in the fourth connecting member, the web of the outrigger beam and the web of the steel column are connected by a seventh group of bolts.

[0010] Two pads are arranged between each V-shaped plate and the flange where it is located, wherein the two pads are respectively located on two sides of the V-shaped plate.

[0011] Thickness of the pad t d , thickness of bolt and nut t b The following relations are satisfied:

[0012] t d ≥t b (1)

[0013] In order to fully exert the bearing capacity of the V-shaped plate, the following conditions should be met:

[0014] t p <t T +t V (2)

[0015] Among them, t p is the thickness of the cleat flange and the web of the cantilever beam, t T is the thickness of the splint web and the cantilever beam flange.

[0016] The bending length l0 of the V-shaped plate satisfies:

[0017] l0≥d T +m1(3)

[0018] Among them, d T is the diameter of the bolt and nut, m1 is the distance between the two bolts below the bending part of the V-shaped plate, and l0 is the bending length of the V-shaped plate.

[0019] The bending angle of the V-shaped plate meets the following requirements:

[0020] α=arctan(2h V / l0)<45°(4)

[0021] Among them, α is the angle between the V-shaped plate and the horizontal plane, and l0 is the bending length of the V-shaped plate.

[0022] The thickness and width of the V-shaped plate meet the following requirements:

[0023] t V ≥t T (5)

[0024] (w vw +w vn ) / 2=w T (6)

[0025] Among them, t v is the thickness of the V-shaped plate, w T is the width of the web and the flange of the cantilever beam, w vn is the width of the upper V-shaped plate, w vw is the width of the lower V-shaped plate, t T is the thickness of the splint web and the cantilever beam flange.

[0026] The present invention has the following beneficial effects:

[0027] In the specific operation of the system for improving the continuous collapse resistance of T-connected steel structures based on V-shaped layered plates described in the present invention, due to the appearance of plastic hinges at the roots of the flanges of the T-shaped parts or the bolt holes of the web, fracture damage occurs, resulting in insufficient anti-collapse capacity of the nodes. The present invention adds V-shaped plates at the flanges so that the V-shaped plates take over the load-bearing of the nodes after the web of the connector is damaged, thereby improving its load-bearing capacity and deformation capacity, thereby achieving the purpose of improving the anti-collapse capacity of the nodes. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0029] Figure 1 It is a structural diagram of the present invention;

[0030] Figure 2 This is the location diagram of the cantilever beam;

[0031] Figure 3 It is the position diagram of the splint;

[0032] Figure 4 is a schematic diagram of a V-shaped plate;

[0033] Figure 5 is a schematic diagram of the connecting parts;

[0034] Figure 6 This is the structural diagram of the cantilever beam;

[0035] Figure 7 This is the structural diagram of the plywood;

[0036] Figure 8This is a performance comparison diagram of the present invention and the prior art in the strong axis direction;

[0037] Fig. 9 This is a performance comparison diagram between the present invention and the prior art in the weak axis direction.

[0038] Among them, 1 is a V-shaped plate, 2 is the sixth set of bolts, 3 is an outrigger beam, and 4 is a clamping plate. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] In the description of the present invention, it should be understood that the terms “include” and “comprises” indicate the presence of 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 collections thereof.

[0041] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0042] It should be further understood that the term "and / or" used in the present specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects are in an "or" relationship.

[0043] It should be understood that, although the terms first, second, third, etc. may be used to describe preset ranges, etc. in the embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are only used to distinguish 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.

[0044] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0045] In order to make the purpose, 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 drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can usually 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 invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0046] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0047] Embodiment 1

[0048] refer to Figures 1 to 7 The system for improving the anti-continuous collapse capability of T-connected steel structure based on V-shaped layered plates of the present invention comprises a steel column, a first H-shaped steel beam, a second H-shaped steel beam and four connecting members, wherein the connecting members comprise a clamping plate 4 and two V-shaped plates 1, and the ends of the two V-shaped plates 1 are welded to the clamping plate 4;

[0049] The steel column is an H-shaped steel, and the flange of the steel column is connected to the first H-shaped steel beam through a first connecting member and a second connecting member, wherein the first connecting member and the second connecting member are respectively located on both sides of the web of the first H-shaped steel beam, a V-shaped plate 1 in the first connecting member and a V-shaped plate 1 in the second connecting member are both located at the bottom of the upper flange of the first H-shaped steel beam and are connected to the upper flange through a first group of bolts, another V-shaped plate 1 in the first connecting member and another V-shaped plate 1 in the second connecting member are both located on the upper part of the lower flange of the first H-shaped steel beam and are connected to the lower flange through a second group of bolts, and the clamping plate 4 in the first connecting member and the clamping plate 4 in the second connecting member are both connected to the flange of the steel column through a third group of bolts.

[0050] An outrigger beam 3 is provided between the two flanges of the steel column, and the outrigger beam 3 is an I-beam structure, wherein the third connecting member is located on one side of the web of the second H-shaped steel beam, and the fourth connecting member is located on the other side of the web of the second H-shaped steel beam, a V-shaped plate 1 in the third connecting member, a V-shaped steel plate in the fourth connecting member, the upper flange of the second H-shaped steel beam and the upper flange of the outrigger beam 3 are connected by a fourth group of bolts, another V-shaped plate 1 in the third connecting member, another V-shaped plate 1 in the fourth connecting member, the lower flange of the second H-shaped steel beam and the lower flange of the outrigger beam 3 are connected by a fifth group of bolts, the splint 4 in the third connecting member, the web of the outrigger beam 3 and the web of the steel column are connected by a sixth group of bolts 2, and the splint 4 in the fourth connecting member, the web of the outrigger beam 3 and the web of the steel column are connected by a seventh group of bolts, wherein the sixth group of bolts 2 and the seventh group of bolts are both tension bolts.

[0051] Two pads are arranged between each V-shaped plate 1 and the flange where it is located, wherein the two pads are respectively located on two sides of the V-shaped plate 1 .

[0052] The design of the V-shaped plate 1 mainly includes seven parameters: d1 ,t d 、w vn 、w vw 、h V , l0 and t V , where l d1 is the length of the pad close to the steel column side, t d is the thickness of the two pads, w vn is the width of the upper V-shaped plate 1, w vw is the width of the lower V-shaped plate 1, h V is the bending height of the V-shaped plate 1, l0 is the bending length of the V-shaped plate 1, t v is the thickness of the V-shaped plate 1, l d1 ,t d 、w vn and vwIt is a secondary parameter and can be determined according to the structural size and construction requirements. V , l0 and t V It is the main parameter, which is determined according to the deformation capacity of the connector and the cross-sectional parameters of the beam and column.

[0053] Thickness of the pad t d Should not be less than the thickness of the bolts and nuts connecting the T-shaped short webs. b , to avoid the influence of the bolts and nuts on the V-shaped plate 1 under tension, as expressed by inequality (1).

[0054] In order to fully exert the bearing capacity of the V-shaped plate 1, formula (2) should be satisfied.

[0055] The bending length l0 of the V-shaped plate 1 should satisfy inequality (3) to ensure that the bolt does not intersect the two pads of the V-shaped plate 1.

[0056] It is recommended that the bending angle of the V-shaped plate 1 does not exceed 45° to avoid premature fracture of the V-shaped plate 1, as expressed by inequality (4).

[0057] In order to ensure the effective load transfer of the V-shaped plate 1 after the web of the clamp plate 4 and the flange of the cantilever beam 3 are broken, the thickness and width of the V-shaped plate 1 should be greater than or equal to the thickness and width of the web of the clamp plate 4 and the flange of the cantilever beam, respectively, as expressed by inequality (5) and equation (6), respectively.

[0058] t d ≥t b (1)

[0059] t p <t T +t V (2)

[0060] l0≥d T +m1(3)

[0061] α=arctan(2h V / l0)<45°(4)

[0062] t V ≥t T (5)

[0063] (w vw +w vn ) / 2=w T (6)

[0064]

[0065]

[0066]

[0067]

[0068]

[0069]

[0070]

[0071] k=2η V cosα(14)

[0072] Among them, t b is the thickness of the bolt and nut; t p is the thickness of the flange of the splint 4 and the web of the cantilever beam 3; t T is the thickness of the web of the splint 4 and the flange of the cantilever beam 3; d T is the diameter of the bolt and nut; m1 is the distance between the two bolts below the bend of the V-shaped plate 1; α is the angle between the V-shaped plate 1 and the horizontal plane; w T v is the width of the web of the splint 4 and the flange of the cantilever beam 3; T 、v p1 are the limit deformation of the web of the splint 4 and the flange of the outrigger beam 3 and the deformation of the flange of the splint 4 and the web of the outrigger beam 3 at this time; v B 、v p3 are the deformation of the V-shaped plate 1 in the rotation deformation stage and the horizontal deformation of the corresponding side clamp plate 4 flange and the cantilever beam 3 web; C is the deformation coefficient, which depends only on the material properties; h b is the cross-sectional height of the beam; m2 is the distance from the center line of the web of the splint 4 and the flange of the cantilever beam 3 to the center line of the V-shaped plate 1; m is the distance from the center line of the bolt to the center line of the web of the splint 4 and the flange of the cantilever beam 3; n is the number of layers of the V-shaped plate 1; η V is the influence coefficient; t V When ≥8mm, η V Take 0.95; when 4mm<t V When <8mm, η V Take 1; when t V When ≤4mm, η V Take 1.1.

[0073] Embodiment 2

[0074] The construction method of the system for improving the progressive collapse resistance of T-connected steel structures based on V-shaped layered plates of the present invention comprises the following steps:

[0075] Four connecting parts are prefabricated in the factory and then transported to the construction site. Then the components are hoisted into place and finally connected by the first set of bolts, the second set of bolts, the third set of bolts, the fourth set of bolts, the fifth set of bolts, the sixth set of bolts 2 and the seventh set of bolts.

[0076] Embodiment 3

[0077] The design method of the system for improving the progressive collapse resistance of T-connected steel structures based on V-shaped layered plates of the present invention comprises the following steps:

[0078] According to formula (1), the parameter t is determined d , according to formula (5) to determine w vn 、w vw and t v ;

[0079] Determine the parameter l according to the construction requirements d1 , the bolts can be installed without affecting the bending of the V-shaped plate 1.

[0080] According to formula (3), the parameter l0 is preliminarily determined;

[0081] Set l0 and t V Substitute into equation (11) and solve for h V , and discard negative solutions;

[0082] Verify l0 and h by formula (4) V If the values ​​of l0 are unreasonable, readjust l0 until equation (4) is satisfied.

[0083] Embodiment 4

[0084] 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, the steps of the method for generating and uploading the trusted status alarm information are implemented. The memory may include a memory, such as a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk memory, etc. The processor, the network interface, and the memory are interconnected through an internal bus. The internal bus may be an industrial standard architecture bus, a peripheral component interconnection standard bus, an extended industrial standard architecture bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. The memory is used to store programs. Specifically, the program may include a program code, and the program code includes computer operation instructions. The memory may include a memory and a non-volatile memory, and provide instructions and data to the processor.

[0085] Embodiment 5

[0086] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the design method of the system for improving the progressive collapse resistance of T-connected steel structures based on V-shaped layered plates are implemented. Specifically, the computer-readable storage medium includes, but is not limited to, volatile memory and / or non-volatile memory. The volatile memory may include random access memory (RAM) and / or cache memory, etc. The non-volatile memory may include read-only memory (ROM), hard disk, flash memory, optical disk, magnetic disk, etc.

[0087] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0088] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0089] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0090] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0091] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and disclosure of the invention. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0092] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0093] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A system for improving the progressive collapse resistance of T-connected steel structures based on V-shaped layered plates, characterized in that: It comprises a steel column, a first H-shaped steel beam, a second H-shaped steel beam and four connecting parts, wherein the connecting parts comprise a clamping plate (4) and two V-shaped plates (1), and the ends of the two V-shaped plates (1) are welded to the clamping plate (4); The steel column is an H-shaped steel, and the flange of the steel column is connected to the first H-shaped steel beam through a first connecting piece and a second connecting piece; The steel column and the second H-shaped steel beam are connected via a third connecting piece, a fourth connecting piece and an outrigger beam (3).

2. The system for improving the progressive collapse resistance of T-connected steel structures based on V-shaped layered plates according to claim 1 is characterized in that: The first connecting member and the second connecting member are respectively located on both sides of the web of the first H-shaped steel beam, a V-shaped plate (1) in the first connecting member and a V-shaped plate (1) in the second connecting member are both located at the bottom of the upper flange of the first H-shaped steel beam and are connected to the upper flange via a first group of bolts, another V-shaped plate (1) in the first connecting member and another V-shaped plate (1) in the second connecting member are both located at the upper part of the lower flange of the first H-shaped steel beam and are connected to the lower flange via a second group of bolts, and a clamping plate (4) in the first connecting member and a clamping plate (4) in the second connecting member are both connected to the flange of the steel column via a third group of bolts.

3. The system for improving the progressive collapse resistance of T-connected steel structures based on V-shaped layered plates according to claim 2 is characterized in that: The outrigger beam (3) is an I-beam structure.

4. The system for improving the progressive collapse resistance of T-connected steel structures based on V-shaped layered plates according to claim 3 is characterized in that: An outrigger (3) is provided between the two flanges of the steel column, wherein the third connecting member is located on one side of the web of the second H-shaped steel beam, and the fourth connecting member is located on the other side of the web of the second H-shaped steel beam; a V-shaped plate (1) in the third connecting member, a V-shaped steel plate in the fourth connecting member, the upper flange of the second H-shaped steel beam and the upper flange of the outrigger (3) are connected by a fourth group of bolts; another V-shaped plate (1) in the third connecting member, another V-shaped plate (1) in the fourth connecting member, the lower flange of the second H-shaped steel beam and the lower flange of the outrigger (3) are connected by a fifth group of bolts; a clamping plate (4) in the third connecting member, the web of the outrigger (3) and the web of the steel column are connected by a sixth group of bolts (2); and a clamping plate (4) in the fourth connecting member, the web of the outrigger (3) and the web of the steel column are connected by a seventh group of bolts.

5. The system for improving the progressive collapse resistance of T-connected steel structures based on V-shaped layered plates according to claim 4 is characterized in that: Two pads are arranged between each V-shaped plate (1) and the flange where it is located, wherein the two pads are respectively located on two sides of the V-shaped plate (1).

6. The system for improving the progressive collapse resistance of T-connected steel structures based on V-shaped layered plates according to claim 4 is characterized in that: Thickness of the pad t d and the thickness of the bolt and nut t b The following relations are satisfied: t d ≥t b (1)。 7. The system for improving the progressive collapse resistance of T-connected steel structures based on V-shaped layered plates according to claim 4 is characterized in that: In order to fully exert the bearing capacity of the V-shaped plate (1), the following conditions should be met: t p <t T +t V (2) Among them, t p is the thickness of the flange of the splint (4) and the web of the cantilever beam (3), t T is the thickness of the web of the splint (4) and the flange of the cantilever beam (3).

8. The system for improving the progressive collapse resistance of T-connected steel structures based on V-shaped layered plates according to claim 4 is characterized in that: The bending length l0 of the V-shaped plate 1 satisfies: l0≥d T +m1(3) Among them, d T is the diameter of the bolt and nut, m1 is the distance between the two bolts below the bending of the V-shaped plate 1, and l0 is the bending length of the V-shaped plate (1).

9. The system for improving the progressive collapse resistance of T-connected steel structures based on V-shaped layered plates according to claim 4 is characterized in that: The bending angle of the V-shaped plate (1) satisfies: α=arctan(2h V / l0)<45°(4) Wherein, α is the angle between the V-shaped plate (1) and the horizontal plane, and l0 is the bending length of the V-shaped plate (1).

10. The system for improving the progressive collapse resistance of T-connected steel structures based on V-shaped layered plates according to claim 4, characterized in that: The thickness and width of the V-shaped plate (1) satisfy: t V ≥t T (5) (In vw +in vn ) / 2=in T (6) Among them, t v is the thickness of the V-shaped plate (1), w T is the width of the web of the cleat (4) and the flange of the cantilever beam (3), w vn is the width of the upper V-shaped plate (1), w vw is the width of the lower V-shaped plate (1), t T is the thickness of the web of the splint (4) and the flange of the cantilever beam (3).

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