Reinforced hollow square steel tube high-strength concrete column-steel beam replaceable plastic hinge joint

Abstract

The utility model relates to a hinged joint, especially relates to a replaceable plastic hinged joint of reinforced hollow square steel pipe high-strength concrete column-steel beam in the technical field of building engineering structure. Including reinforced hollow square steel pipe high-strength concrete column and steel beam, the reinforced hollow square steel pipe high-strength concrete column of vertical placement is welded through outer ring plate with the cantilever beam of horizontal placement, the both sides of cantilever beam web are separately equipped with cantilever beam web reinforcing plate, the both sides of steel beam web end portion are separately equipped with steel beam web reinforcing plate, the lateral side of the cantilever beam web reinforcing plate and steel beam web reinforcing plate of same side is equipped with web connecting plate, and the upper and lower flange of cantilever beam and steel beam is connected through flange connecting plate. The utility model will appear in two beam splicing place under the structure plastic hinge of earthquake, and the upper and lower flange connecting plate will yield deformation first, and the web connecting plate and pin shaft of middle part play the role of supporting middle beam. After the earthquake, only need to replace the upper and lower flange connecting plate, to reach the function of building structure rapid recovery.

Description

Technical Field

[0001] This utility model relates to a hinged joint, and more particularly to a replaceable plastic hinged joint for reinforced hollow square steel tube high-strength concrete columns-steel beams in the field of building engineering structural technology. Background Technology

[0002] With the development of structural engineering, the concept of seismic design for building structures has been gradually improved. Traditional seismic design prioritizes protecting life, aiming to ensure that the building structure primarily undergoes ductile failure during an earthquake, avoiding brittle failure and collapse, thus maximizing escape opportunities and reducing earthquake damage to some extent. Based on the strong column-weak beam principle, in traditional frame structures, plastic hinges first appear at the beam ends during an earthquake to dissipate seismic energy. Recoverable structures improve upon this concept by concentrating structural damage at one point and installing replaceable energy-dissipating components there, allowing the plastic hinges at the beam-column joints to shift outwards. However, existing replaceable beam-column joints often use bolted connections between the beam web and web plate, which have limited rotational capacity and cannot fully utilize the low-yield-point steel characteristics of the upper and lower energy-dissipating plates. Furthermore, under seismic loads, the limited rotational capacity of traditional bolted connections inevitably leads to plastic deformation at the bolt holes in the beam web. Therefore, there is an urgent need to develop a prefabricated replaceable beam-column joint that enables rapid replacement, efficient force transmission, and near-zero damage to the main components. Summary of the Invention

[0003] To address the aforementioned technical problems, this utility model provides a replaceable plastic hinged joint for high-strength concrete columns and beams with reinforced hollow square steel tubes. The aim is to achieve a prefabricated replaceable beam-column joint that enables rapid replacement, efficient force transmission, concentrated damage, and prevents damage to the main body of the beam and column.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a replaceable plastic hinge joint for a reinforced hollow square steel tube high-strength concrete column-steel beam, comprising a reinforced hollow square steel tube high-strength concrete column and a steel beam. The vertically placed reinforced hollow square steel tube high-strength concrete column and the horizontally placed cantilever beam are welded together by an outer ring plate. The cantilever beam web reinforcement plates are respectively provided on both sides of the web of the cantilever beam, and the steel beam web reinforcement plates are respectively provided on both sides of the end of the web of the steel beam. Web connecting plates are provided on the outer sides of the cantilever beam web reinforcement plates and the steel beam web reinforcement plates on the same side. The upper and lower flanges of the cantilever beam and the steel beam are connected by flange connecting plates.

[0005] The web of the cantilever beam, the web reinforcement plate of the cantilever beam, and the web connecting plate are connected by high-strength bolts, while the web of the steel beam, the web reinforcement plate of the steel beam, and the web connecting plate are connected by pins.

[0006] The flange connecting plate is made of steel with a low yield point.

[0007] The flange connecting plate is connected to the upper and lower flanges of the cantilever beam and the steel beam using high-strength bolts.

[0008] The outer ring plate consists of two pieces, which are connected to the reinforced hollow square steel tube high-strength concrete column and the flange of the cantilever beam respectively by fillet welds. The reinforced hollow square steel tube high-strength concrete column is a composite column formed by placing prestressed high-strength concrete pipe piles in the steel tubes and pouring high-strength concrete in the interlayer between the steel tubes and the prestressed high-strength concrete pipe piles.

[0009] A gap is provided at the joint between the steel beam and the cantilever beam to allow for full rotation of the structure.

[0010] Each outer ring plate forms a groove at the connection point with the cantilever beam, and the flange of the cantilever beam is inserted into the groove and welded.

[0011] The advantages and effects of this invention are as follows: Under earthquake conditions, the structural plastic hinge will appear at the joint of the two beams. The upper and lower flange connecting plates will yield and deform first, while the web connecting plate and pin in the middle part will support the middle beam. After the earthquake, only the upper and lower flange connecting plates need to be replaced, so as to achieve rapid restoration of the building structure's function.

[0012] 1. This utility model uses a pin connection at the connection between the web plate connecting plate and the intermediate steel beam, which gives the splicing form sufficient rotational capacity. At the same time, the pin can also provide sufficient shear resistance. The load on the intermediate steel beam is transferred to the web plate connecting plate and the cantilever beam in sequence through the pin. The force transmission is simple, efficient and easy to construct.

[0013] 2. Due to the pin connection, its rotational capacity is greatly enhanced compared to traditional bolt connections, allowing the upper and lower energy-dissipating plates to undergo sufficient plastic deformation to fully utilize the material properties of low-yield-point steel and increase seismic energy dissipation. During an earthquake, except for the upper and lower flange connecting plates which are in a plastic energy-dissipating state, the remaining components remain in an elastic state throughout the process. After damage occurs, only the damaged parts need to be replaced to quickly restore structural function, reducing post-earthquake repair time. Attached Figure Description

[0014] Figure 1 This is a three-dimensional schematic diagram of the present invention.

[0015] Figure 2 This is a front view of the present invention.

[0016] Figure 3 This is a partially enlarged structural schematic diagram of this utility model.

[0017] In the diagram: 1. High-strength concrete column with reinforced hollow square steel tubes; 2. Outer ring plate; 3. Cantilever beam; 4. Steel beam; 5. Flange connecting plate; 6. Web connecting plate; 7. Steel beam web reinforcement plate; 8. Cantilever beam web reinforcement plate; 9. High-strength bolt; 10. Pin. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the embodiments. The following embodiments are only specific embodiments of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial improvements to the present invention made using this concept should fall within the protection scope of the present invention.

[0019] As shown in the figure, this utility model relates to a replaceable plastic hinged joint for a reinforced hollow square steel tube high-strength concrete column-steel beam, comprising a reinforced hollow square steel tube high-strength concrete column 1 and a steel beam 4. The vertically placed reinforced hollow square steel tube high-strength concrete column 1 and the horizontally placed cantilever beam 3 are welded together by outer ring plates 2. The outer ring plates 2 consist of two pieces, one above the other, mounted on the reinforced hollow square steel tube high-strength concrete column 1. The two outer ring plates 2 are connected to the flange portion of the cantilever beam 3 via fillet welds. A groove is formed at the connection point between each outer ring plate 2 and the cantilever beam 3, and the flange of the cantilever beam 3 is inserted into the groove and welded to the groove of the outer ring plate 2.

[0020] Cantilever beam 3 has web reinforcement plates 8 on both sides of its web, which are welded to the web of cantilever beam 3. Steel beam 4 has web reinforcement plates 7 on both sides of its web end, which are welded to the steel beam 4. Web connecting plates 6 are provided on the outer sides of the web reinforcement plates 8 and 7 on the same side to prevent tearing due to stress concentration at the pin holes. The upper and lower flanges of cantilever beam 3 and steel beam 4 are connected by flange connecting plates 5, which are connected to the upper and lower flanges of cantilever beam 3 and steel beam 4 using high-strength bolts 9. The web of cantilever beam 3, web reinforcement plates 8, and web connecting plates 6 are connected using high-strength bolts 9, while the web of steel beam 4, web reinforcement plates 7, and web connecting plates 6 are connected using pins 10.

[0021] The flange connecting plate 5 is made of steel with a low yield point.

[0022] A prestressed high-strength concrete pipe pile is placed in the steel pipe of a reinforced hollow square steel pipe high-strength concrete column 1, and high-strength concrete is poured into the interlayer between the steel pipe and the prestressed high-strength concrete pipe pile to form a composite column.

[0023] A gap is provided at the joint between steel beam 4 and cantilever beam 3 to allow for full rotation of the structure.

[0024] The thickness of the third flange of the cantilever beam is greater than that of the steel beam flange, and the height and width of the cantilever beam are the same as those of the steel beam.

[0025] The thickness of the outer ring plate should be the same as the thickness of the cantilever beam. The length of the butt weld between the outer ring plate and the cantilever beam should be greater than or equal to the beam width to ensure that the stiffness and strength of the connection between the cantilever beam and the column through the outer ring plate are greater than those of traditional welding.

[0026] The cantilever beam and the intermediate beam transmit force through a pin. The pin needs to rotate. To prevent the steel beam and the cantilever beam from squeezing each other and affecting the rotation capacity of the joint, a certain gap needs to be left at the splicing position.

[0027] During construction, holes are drilled before installing cantilever beam 3, steel beam 4, web connecting plate 6, flange connecting plate 5, and cantilever beam web reinforcing plate 8 and steel beam web reinforcing plate 7. The specific installation process is as follows: First, cantilever beam web reinforcing plate 8 and steel beam web reinforcing plate 7 are welded onto cantilever beam 3 and steel beam 4 respectively. Second, the position for welding outer ring plate 2 is determined on the reinforced hollow square steel tube high-strength concrete column 1 and welded, and then cantilever beam 3 is welded at the grooves of the upper and lower outer ring plates. Third, a crane is used to lift steel beam 4 to the predetermined position, the web connecting plate 6 is placed in the hole, and high-strength bolts 9 and pins 10 are used to connect steel beam 4 to cantilever beam 3. Finally, the upper and lower flange connecting plates 5 are installed.

[0028] Specific working principle: The force transmission mechanism of this utility model is that the web of the steel beam is connected by a pin 10, so that the node rotates around the pin hole in the web of the steel beam at the design inter-story drift angle, and no contact occurs between the beam flanges during rotation. Shear force is transmitted at the splice through the pin and the web connecting plate. Since the upper and lower flange connecting plates will undergo tensile and compressive deformation during rotation, the bending moment at the splice is transmitted through the force couple formed by the axial force. The bending moment and shear force on the cantilever beam are transmitted to the column through the rigid node formed by the welded outer ring plate. Since the initial stiffness and bending bearing capacity of the welded node at the column end are greater than those at the splice position, and the plastic resistance bending moment of the energy dissipation component is less than the elastic resistance bending moment of the intermediate steel beam, damage will first occur at the splice position. After an earthquake, only the upper and lower flange connecting plates need to be replaced.

[0029] Finally, it should be noted that the above description is only used to illustrate the technical solution of this utility model and not to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A replaceable plastic hinge joint for a reinforced hollow square steel tube high-strength concrete column-steel beam, comprising a reinforced hollow square steel tube high-strength concrete column (1) and a steel beam (4), characterized in that: A vertically placed reinforced hollow square steel tube high-strength concrete column (1) and a horizontally placed cantilever beam (3) are welded together by an outer ring plate (2). The web of the cantilever beam (3) is provided with a cantilever beam web reinforcement plate (8) on both sides. The web of the steel beam (4) is provided with a steel beam web reinforcement plate (7) on both sides. The web connecting plate (6) is provided on the outer side of the cantilever beam web reinforcement plate (8) and the steel beam web reinforcement plate (7) on the same side. The upper and lower flanges of the cantilever beam (3) and the steel beam (4) are connected by a flange connecting plate (5).

2. The replaceable plastic hinge joint of reinforced hollow square steel tube high-strength concrete column-steel beam according to claim 1, characterized in that... The web of the cantilever beam (3), the web reinforcement plate (8) of the cantilever beam, and the web connecting plate (6) are connected by high-strength bolts (9), and the web of the steel beam (4), the web reinforcement plate (7) of the steel beam, and the web connecting plate (6) are connected by pins.

3. The replaceable plastic hinge joint of reinforced hollow square steel tube high-strength concrete column-steel beam according to claim 1, characterized in that... The flange connecting plate (5) is made of steel with a low yield point.

4. The replaceable plastic hinge joint of reinforced hollow square steel tube high-strength concrete column-steel beam according to claim 3, characterized in that... The flange connecting plate (5) is connected to the upper and lower flanges of the cantilever beam (3) and the steel beam (4) by high-strength bolts (9).

5. The replaceable plastic hinge joint of reinforced hollow square steel tube high-strength concrete column-steel beam according to claim 1, characterized in that... The outer ring plate (2) consists of two pieces, which are connected to the flange of the reinforced hollow square steel tube high-strength concrete column (1) and the cantilever beam (3) respectively by fillet welds.

6. The replaceable plastic hinge joint of reinforced hollow square steel tube high-strength concrete column-steel beam according to claim 1, characterized in that... The reinforced hollow square steel tube high-strength concrete column (1) is formed by placing prestressed high-strength concrete pipe piles in the steel tubes and pouring high-strength concrete in the interlayer between the steel tubes and the prestressed high-strength concrete pipe piles.

7. The replaceable plastic hinged joint of reinforced hollow square steel tube high-strength concrete column-steel beam according to claim 1, 2 or 4, characterized in that... A gap is provided at the joint between the steel beam (4) and the cantilever beam (3) to allow for full rotation of the structure.

8. The replaceable plastic hinge joint of reinforced hollow square steel tube high-strength concrete column-steel beam according to claim 5, characterized in that... A groove is formed at the connection between each outer ring plate (2) and the cantilever beam (3), and the flange of the cantilever beam (3) is inserted into the groove and welded.

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