Detachable steel structure joint based on secondary defense design

Abstract

The invention discloses a detachable steel structure joint based on secondary defense design, and belongs to the technical field of steel structure joints. The I-shaped beam is limited in the pi-shaped structural plate, a vertical spacing baffle is arranged at the tail of the I-shaped beam, the bent steel plates are symmetrically arranged on the two sides of the I-shaped beam, and the tail ends of the sides, away from the steel columns, of the bent steel plates penetrate through the vertical spacing baffle and are in bidirectional limiting connection with the I-shaped beam and the vertical spacing baffle through haunched steel plates; a buffer material ACF plate is bonded on the adjustable bolts and abuts against the I-shaped beam. By means of the structure-adjustable bolt, gaps between structures caused by assembly can be effectively reduced; a buffer material ACF plate is arranged, so that the transverse impact effect can be effectively reduced; when the main body structure suffers from earthquakes or other impact loads, the joints are bent and deformed, and when the I-shaped beams yield to be incapable of bearing the loads, the bent steel plates can be further straightened and continue to bear the loads until the steel plates are broken, so that the bearing capacity of the main body structure is improved to a great extent.

Description

Technical Field

[0001] The present invention relates to the technical field of node connection, and particularly to a detachable steel structure node based on secondary defense design. Background Technique

[0002] Steel structure buildings are buildings with a load-bearing structure composed of construction steel. They are usually composed of load-bearing structures made of beams, columns, trusses and other components made of section steel and steel plates, and together with enclosing structures such as roofs, floors and walls to form a complete building. Construction section steel usually refers to hot-rolled angle steel, channel steel, I-beam, H-section steel, steel pipe, etc. Steel has high strength and load-bearing capacity. Under the same load, the self-weight of the steel structure is lighter, which can not only reduce the foundation load of the building, but also save materials and construction costs. The characteristics of steel being resistant to tensile and bending enable it to absorb seismic energy through deformation and bending during an earthquake, reducing damage to the building. The steel structure has strong integrity and large node rigidity, which can further improve its seismic performance. The components of the steel structure are generally prefabricated in the factory and then transported to the construction site for assembly. This prefabricated production and on-site rapid assembly method greatly shortens the construction period. The construction process is not affected by seasons and can proceed normally under various climatic conditions. Steel has excellent plasticity and workability, and can be flexibly designed according to the creativity and needs of architects. The steel structure can achieve complex designs such as large spans and overhangs, adapting to different architectural styles and functional requirements. Steel structure buildings are a green building system. The recyclability of steel reduces construction waste, meeting the concept of sustainable development. In addition, the use of sand, stone and lime is greatly reduced during the construction of steel structure buildings, and the materials used are mainly green, recyclable or degradable materials.

[0003] In the modern construction industry, steel structure buildings have won high recognition and wide acclaim from industry insiders due to a series of remarkable advantages such as high strength, good toughness, uniform material properties and convenient construction. From the current technical level and research results, prefabricated steel structure buildings have entered the track of regularization and standardization in many aspects such as material selection, R & D innovation and construction. Its application fields are also extremely wide, covering not only conventional fields such as civil buildings and commercial buildings, but also important infrastructure construction such as bridges and tunnels, as well as industrial fields such as light industry and heavy industry, demonstrating strong application potential and market competitiveness.

[0004] However, although prefabricated steel structure buildings have shown outstanding advantages in many aspects, in terms of integrity and stiffness, compared with traditional building structure forms, such as brick-concrete structures, reinforced concrete structures, etc., there are still certain weaknesses. This has led to relatively poor seismic and impact resistance capabilities of steel structure buildings. Especially when facing natural disasters such as strong earthquakes and extreme weather, they may face greater safety risks. The existence of rigid joints in steel structure buildings is a problem that cannot be ignored. Rigid joints play a crucial role in steel structures. They are responsible for transferring loads, controlling the integrity of the structure, and directly affecting the safety of the entire steel structure. However, current joint connection methods, such as welding and bolt connection, mostly belong to rigid connections. Although this connection method ensures the stability of the structure to a certain extent, it is prone to brittle failure when facing complex conditions such as earthquakes, impact loads, or environmental corrosion, thus bringing potential safety hazards to steel structure buildings. Summary of the Invention

[0005] The purpose of the present invention is to make up for the defects of the existing technology and provide a detachable steel structure joint based on secondary defense design. The present invention reduces the processing and assembly difficulty of components and the brittleness of joints; when the main structure is subjected to earthquakes and impact loads, the ACF board will provide a certain degree of buffering effect; when the external load is too large and bending deformation occurs at the joint, when the steel beam yields and cannot bear the load, the bent rectangular steel plate will be further straightened and continue to bear the load until the steel plate breaks, greatly improving the load-bearing capacity of the main structure; the use of adjustable bolts reduces the risk of damage caused by internal interactions within the structure due to gaps between components.

[0006] The present invention is achieved through the following technical solutions: A detachable steel structure joint based on secondary defense design, which is connected between two cross-shaped beam-column structures, includes a steel column, a π-shaped structural plate fixed around the steel column, an I-beam limited between the π-shaped structural plates, a bent steel plate, a haunch steel plate, a vertical spacer baffle and a pressing plate; the π-shaped structural plate is vertically fixed on the outer wall of the steel column, the I-beam is fixed on the π-shaped structural plate, and the upper and lower plates of the I-beam are respectively fixedly connected with the two horizontal plates of the π-shaped structural plate. The vertical spacer baffle is arranged at one end of the I-beam away from the steel column and between the upper and lower plates of the I-beam. The upper end of the vertical spacer baffle is fixedly connected with the upper plate of the I-beam. The bent steel plate is horizontally arranged on the upper surface of the lower plate of the I-beam. One end of the bent steel plate close to the steel column is fixedly connected with the lower plate of the I-beam. The end of the bent steel plate away from the steel column passes through between the vertical spacer baffle and the lower plate of the I-beam. The haunch steel plate is located at the contact position between the vertical spacer baffle and the bent steel plate, and the haunch steel plate, the vertical spacer baffle, the bent steel plate and the lower plate of the I-beam are fixedly connected by bolts. Adjusting holes are respectively opened at the positions of the steel column wall and the π-shaped structural plate corresponding to each other, and the positions of the adjusting holes correspond to the vertical plates of the I-beam. An adjustable bolt is arranged in the adjusting hole, and the pressing plate is fixed at one end of the adjustable bolt on the outer side of the steel column, and the pressing plate abuts against the vertical plate of the I-beam.

[0007] The steel column is a square steel column, and four π-shaped structural plates are symmetrically fixed on the four sides of the square steel column respectively.

[0008] Reserved holes one for fixedly connecting with the steel column are respectively reserved at the upper and lower ends of the π-shaped structural plate, and reserved holes two for fixedly connecting with the I-beam are respectively reserved on the two horizontal plates of the π-shaped structural plate.

[0009] Reserved holes three adapted to the reserved holes two are respectively reserved at one ends of the upper and lower plates of the I-beam close to the steel column, and the upper and lower plates of the I-beam are respectively fixedly connected with the two horizontal plates of the π-shaped structural plate by bolts; reserved holes four for fixedly connecting with the haunch steel plate and the bent steel plate are reserved at one end of the lower plate of the I-beam away from the steel column.

[0010] The bent steel plate is a rectangular steel plate, with both ends horizontally arranged and bent upward at the 1 / 3 position of the rectangular steel plate; reserved holes adapted to the reserved holes three and the reserved holes four are respectively arranged at the two horizontal ends of the bent steel plate; the bent steel plates are symmetrically arranged on both sides of the vertical plate of the I-beam.

[0011] The haunch steel plate is an L-shaped steel plate, and both ends of the L-shaped steel plate are fixedly connected with the lower end of the vertical spacer baffle and the end of the bent steel plate away from the steel column by bolts respectively, and the haunch steel plates are symmetrically arranged on both sides of the vertical plate of the I-beam.

[0012] The vertical spacing baffles are rectangular plates, symmetrically arranged on both sides of the vertical plate of the I-beam.

[0013] The top tightening plate is an ACF plate made of buffer material.

[0014] The tightening plate is bonded to the adjustable bolts that penetrate the steel column and the π-shaped structural plate. The adjustable bolts penetrate the steel column and the π-shaped structural plate, and the extending distance is adjusted by rotation, so that the tightening plate and the vertical plate of the I-beam are close to each other, and the position of the I-beam is finely adjusted.

[0015] The upper and lower ends of the π-shaped structural plate are respectively provided with haunch structural plates.

[0016] The advantages of the present invention are: 1) Compared with changing the steel column structure during the production of steel columns, the present invention designs a detachable component, which is convenient for installation and centralized production, and most importantly, convenient for replacement and maintenance of steel structure components; 2) The I-beam of the present invention is connected by bolts at the top and bottom, which easily generates a gap on the left side of the component. The design uses through bolts with buffer materials to support the I-beam, which can adjust the size of the gap and play a certain buffering role when a lateral impact occurs; 3) The bent steel plate of the present invention is clamped in the I-beam, and when the I-beam yields under bending, a new force transmission route can be formed to replace the beam to continue bending until it is straightened and damaged, thereby greatly improving the bearing capacity of the node and playing a secondary defense effect when the node resists external impact.

[0017] 4) The π-shaped structural plate of the present invention has haunches at the upper and lower parts respectively, thereby improving the safety and bearing capacity of the node. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is an overall schematic diagram of the node of the present invention; Figure 2 It is a schematic diagram of a single side of a node of the present invention; Figure 3 is a cross-sectional schematic diagram of a node of the present invention; Figure 4 This is a schematic diagram of a node π-shaped structural plate of the present invention; Figure 5 It is a schematic diagram of the node bent steel plate and the connecting member haunch steel plate of the present invention.

[0019] Numbers in the figure: Steel column 1, π-shaped structural plate 2, I-beam 3, bent steel plate 4, axilla steel plate 5, vertical spacer baffle 6, tightening plate 7, adjustment hole 8, adjustable bolt 9, reserved hole one 10, reserved hole two 11, axilla structural plate 12, high-strength limit bolt 13. DETAILED DESCRIPTION

[0020] The present invention will be further explained below in conjunction with the accompanying drawings.

[0021] As Figures 1-5 shown, a detachable steel structure joint based on secondary defense design is connected between two cross-shaped beam-column structures, and includes a steel column 1, a π-shaped structural plate 2 fixed around the steel column 1, an I-beam 3 limited between the π-shaped structural plates 2, a bent steel plate 4, a haunch steel plate 5, a vertical spaced baffle 6, and a top plate 7; the π-shaped structural plate 2 is vertically fixed on the outer wall of the steel column 1 by high-strength limit bolts 13, the I-beam 3 is fixed on the π-shaped structural plate 2, the upper and lower plates of the I-beam 3 are respectively fixedly connected to the two horizontal plates of the π-shaped structural plate 2 by bolts, the vertical spaced baffle 6 is arranged at one end of the I-beam 3 away from the steel column 1 and between the upper and lower plates of the I-beam 3, and the upper end of the vertical spaced baffle 6 is fixedly connected to the upper plate of the I-beam 3; the bent steel plate 4 is horizontally arranged on the upper surface of the lower plate of the I-beam 3, one end of the bent steel plate 4 close to the steel column 1 is fixedly connected to the lower plate of the I-beam 3 by bolts, and the end of the bent steel plate 4 away from the steel column 1 passes through between the vertical spaced baffle 6 and the lower plate of the I-beam 3; the haunch steel plate 5 is located at the contact position between the vertical spaced baffle 6 and the bent steel plate 4, and the haunch steel plate 5, the vertical spaced baffle 6, the bent steel plate 4, and the lower plate of the I-beam 3 are limited and fixedly connected by bolts; adjustment holes 8 are respectively formed at the positions of the steel column 1 wall and the π-shaped structural plate 2 corresponding to each other, the position of the adjustment hole 8 corresponds to the vertical plate of the I-beam 3, an adjustable bolt 9 is arranged in the adjustment hole 8, and the top plate 7 is fixed at one end of the adjustable bolt 9 outside the steel column 1, and the top plate 7 abuts against the vertical plate of the I-beam 3.

[0022] The steel column 1 is a square steel column, and four π-shaped structural plates 2 are symmetrically fixed on the four sides of the square steel column respectively.

[0023] Reserved holes one 10 for fixedly connecting with the steel column 1 are respectively reserved at the upper and lower ends of the π-shaped structural plate 2, and reserved holes two 11 for fixedly connecting with the I-beam 3 are respectively reserved on the two horizontal plates of the π-shaped structural plate 2.

[0024] Reserved holes three adapted to the reserved holes two 11 are respectively reserved at one ends of the upper and lower plates of the I-beam 3 close to the steel column 1, and the upper and lower plates of the I-beam 3 are respectively fixedly connected to the two horizontal plates of the π-shaped structural plate 2 by bolts; reserved holes four for fixedly connecting with the haunch steel plate 5 and the bent steel plate 4 are reserved at one end of the lower plate of the I-beam 3 away from the steel column 1.

[0025] The bent steel plate 4 is a rectangular steel plate with horizontal ends, and is bent upward at the 1 / 3 position of the rectangular steel plate; reserved holes five adapted to the reserved hole three and the reserved hole four are respectively arranged at the horizontal ends of the bent steel plate 4 for connecting with the I-beam 3 and the haunch steel plate 5 respectively; the bent steel plate 4 is symmetrically arranged on both sides of the vertical plate of the I-beam 3. The bent steel plate 4 is bidirectionally limited and connected with the I-beam 3 and the vertical spacer baffle 6 through the haunch steel plate 5. The bent height of the bent steel plate 4 is taken as 30 mm.

[0026] The haunch steel plate 5 is an L-shaped steel plate, and both ends of the L-shaped steel plate are fixedly connected with the lower end of the vertical spacer baffle 6 and the end of the bent steel plate 4 far from the steel column 1 through bolts, and the haunch steel plate 5 is symmetrically arranged on both sides of the vertical plate of the I-beam 3.

[0027] The vertical spacer baffle 6 is a rectangular plate and is symmetrically arranged on both sides of the vertical plate of the I-beam 3.

[0028] The pressing plate 7 is a buffer material ACF plate.

[0029] The buffer material ACF plate, that is, the ACF artificial cartilage bionic energy-absorbing material plate, is a buffer material with excellent energy absorption and shock absorption performance. The ACF plate can absorb more than 90% of the impact energy, and the highest energy absorption efficiency can reach 97.1%. It disperses or absorbs energy through the internal air sacs or bubble structures, and reduces the impact force by means of hysteretic deformation (such as friction, bending or torsion, elastoplasticity) when subjected to external force impact. The ACF plate has good buffering effect, can quickly disperse and absorb external impact force, so as to reduce the damage to the protected object. The ACF plate is specially designed and manufactured, and has excellent durability and compression resistance. Even after long-term use and frequent impacts, it can maintain its buffering performance and shape stability. The buffer material ACF plate has the characteristics of excellent energy absorption and shock absorption performance, lightness, durability and adaptability, and is widely used in many fields. Its technical advantages, cost-effective advantages and environmental protection advantages make it a buffer material with broad market prospects.

[0030] The pressing plate 7 is bonded to the adjustable bolt 9 passing through the steel column 1 and the π-shaped structural plate 2. The adjustable bolt 9 passes through the steel column 1 and the π-shaped structural plate 2, and the extended distance is adjusted by rotation to make the pressing plate 7 closely abut against the vertical plate of the I-beam 3 for fine adjustment of the position of the I-beam 3.

[0031] Haunch structural plates 12 are respectively arranged at the upper and lower ends of the π-shaped structural plate 2. The upper and lower parts of the π-shaped structural plate are respectively haunched to improve the safety and bearing capacity of the joint.

[0032] Calculate the pre-tightening force and torque based on the bolt stress (yield strength), and at the same time considering the allowable stress requirements of the material, it is generally stipulated that the pre-tightening force of the threaded connection after tightening shall not be greater than 80% of its material yield strength. For steel bolts used for fixation, σ refers to the yield strength of the bolt material. A s refers to the stress cross-sectional area of the bolt. Considering the different materials of the bolts, the pre-tightening forces recommended by the present invention are as follows: Pre-tightening force of carbon steel bolts

[0033] Thus, bolts in different forms that conform to the above pre-tightening force formula can be adopted, providing a wider applicability for the invention. The following describes the specific installation and arrangement method of the present invention in the specific actual operation process: In the preparation stage of the structure, connect the main part of the steel column 1 and the π-shaped structural plate through high-strength limit bolts 13 to form an integral body. Place the bent steel plate 4 steadily, align it with the reserved hole at the first section of the I-beam 3 and snap it in. Place the haunch steel plate 5 at the connection between the end of the bent steel plate 4 and the vertical spacer baffle 6, and bolt it to the I-beam 3; in the assembly stage of the joint, slowly place the I-beam 3 prepared in the above steps into the π-shaped structural plate, align the reserved holes above and below respectively, and make the first end of the I-beam 3 close to the square steel column 1 fit with the buffer material ACF plate. When there is still a gap after the structure is closely attached, slowly rotate the adjustable bolt 9 in the square steel column 1 until the components are closely attached to each other. Finally, tighten the above high-strength limit bolts to make it have the various functions described previously for the present invention.

[0034] The present invention reduces the processing and assembly difficulty of components and the brittleness of joints; when the main structure is subjected to earthquake and impact loads, the ACF plate will provide a certain degree of buffering effect; when the external load is too large and the joint undergoes bending deformation, when the steel beam yields and cannot bear the load, the bent rectangular steel plate will be further straightened and continue to bear the load until the steel plate breaks, greatly improving the bearing capacity of the main structure; the use of the adjustable bolt 9 reduces the risk of damage caused by the internal interaction of the structure due to the gap between components.

[0035] The above embodiments are only the preferred technical solutions of the present invention and should not be regarded as limitations to the present invention. The protection scope of the present invention should be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims, that is, the equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A detachable steel structure node based on secondary defense design, connected between two cross-beam-column structures, characterized by: The invention comprises a steel column, a π-shaped structural plate fixed to the periphery of the steel column, an I-beam limited between the π-shaped structural plates, a bent steel plate, an axilted steel plate, a vertical spacing baffle and a tightening plate; the π-shaped structural plate is vertically fixed to the outer wall of the steel column, the I-beam is fixed to the π-shaped structural plate, the upper and lower plates of the I-beam are respectively fixedly connected to the two horizontal plates of the π-shaped structural plate, the vertical spacing baffle is arranged at an end of the I-beam away from the steel column and is located between the upper and lower plates of the I-beam, the upper end of the vertical spacing baffle is fixedly connected to the upper plate of the I-beam, the bent steel plate is horizontally arranged on the upper surface of the lower plate of the I-beam, and the bent steel plate is close to One end of the steel column is fixedly connected to the lower plate of the I-beam, and the end of the bent steel plate away from the steel column passes through between the vertical spacer baffle and the lower plate of the I-beam. The axillar steel plate is located at the contact position between the vertical spacer baffle and the bent steel plate. The axillar steel plate, the vertical spacer baffle, the bent steel plate and the lower plate of the I-beam are fixedly connected by bolts. Adjustment holes are respectively opened at positions corresponding to the steel column wall and the π-shaped structural plate. The positions of the adjustment holes correspond to the vertical plate of the I-beam. Adjustable bolts are arranged in the adjustment holes. The tightening plate is fixed to the end of the adjustable bolt located on the outside of the steel column, and the tightening plate is close to the vertical plate of the I-beam.

2. According to claim 1, a detachable steel structure node based on secondary defense design is characterized in that: The steel column is a square steel column, and four π-shaped structural plates are symmetrically fixed on the four sides of the square steel column.

3. According to claim 1, a detachable steel structure node based on secondary defense design is characterized in that: The upper and lower ends of the π-shaped structural plate are respectively reserved with reserved holes 1 for fixed connection with the steel column, and the two horizontal plates of the π-shaped structural plate are respectively reserved with reserved holes 2 for fixed connection with the I-beam.

4. The detachable steel structure node based on secondary defense design according to claim 3 is characterized in that: Reserved holes three matching the reserved holes two are reserved at the ends of the upper and lower plates of the I-beam close to the steel column, and the upper and lower plates of the I-beam are fixedly connected to the two horizontal plates of the π-shaped structural plate by bolts; reserved holes four for fixing with the axilted steel plate and the bent steel plate are reserved at the end of the lower plate of the I-beam away from the steel column.

5. The detachable steel structure node based on secondary defense design according to claim 4 is characterized in that: The bent steel plate is a rectangular steel plate with two horizontally arranged ends, and is bent upward at 1 / 3 of the rectangular steel plate; reserved holes matching reserved holes three and reserved holes four are respectively arranged at the horizontal ends of the bent steel plate; the bent steel plate is symmetrically arranged on both sides of the vertical plate of the I-beam.

6. The detachable steel structure node based on secondary defense design according to claim 5 is characterized in that: The axilla steel plate is an L-shaped steel plate, and the two ends of the L-shaped steel plate are respectively fixedly connected to the lower end of the vertical spacing baffle and the end of the bent steel plate away from the steel column by bolts. The axilla steel plate is symmetrically arranged on both sides of the vertical plate of the I-beam.

7. The detachable steel structure node based on secondary defense design according to claim 5 is characterized in that: The vertical spacing baffles are rectangular plates, symmetrically arranged on both sides of the vertical plate of the I-beam.

8. The detachable steel structure node based on secondary defense design according to claim 1 is characterized in that: The top tightening plate is an ACF board made of buffer material.

9. A detachable steel structure node based on secondary defense design according to claim 1 or 8, characterized in that: The clamping plate is bonded to the adjustable bolts penetrating the steel column and the π-shaped structural plate. The adjustable bolts penetrate the steel column and the π-shaped structural plate. The extended distance is adjusted by rotation so that the clamping plate is close to the vertical plate of the I-beam to fine-tune the position of the I-beam.

10. The detachable steel structure node based on secondary defense design according to claim 9, characterized in that: The upper and lower ends of the π-shaped structural plate are respectively provided with haunch structural plates.

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