Antique building special-shaped steel node and method for coordinated energy dissipation of mild steel and friction damper

Abstract

The invention discloses an antique building special-shaped steel node and method for cooperative energy dissipation of a mild steel-friction damper, comprising a beam-column node, a bucket component, a bracket component and a mild steel-friction damper cooperative working device, wherein the beam-column node is composed of a round steel tube lower column, a square steel tube upper column and a rectangular cross-section steel beam, the bracket component comprises a lower bucket component, a bracket component and an upper bucket component, and the mild steel-friction damper cooperative working device comprises a mild steel connecting rod, a column side horizontal plate, a beam connecting piece, a beam bottom horizontal plate, a left constraint plate, a right constraint plate, a friction energy dissipation plate, a high-strength bolt, a bolt gasket and an annular reserved Hole; the nodes of the specimen are steel columns and rectangular steel beams connecting the steel columns. The connection between the round steel tube lower column and the square steel tube upper column is reinforced by a square ribbed plate and a column top reinforcement ring; a bracket component is set at the node, and a soft steel-friction damper cooperative working device is attached to the bracket component; the soft steel-friction damper cooperative working device is located between the round steel tube lower column and the rectangular steel beam, connected by the left constraint plate and the right constraint plate, and energy is dissipated through the friction energy dissipation plate and the soft steel connecting rod, so that the weld at the connection between the beam end flange and the column is not easy to break, thereby reducing the damage to the bracket component. This device can not only improve the seismic performance of the steel structure antique building system, but also maintain the aesthetics of the structural system.

Description

Technical Field

[0001] The invention belongs to the field of antique building steel structure system, and relates to antique building special-shaped steel nodes with coordinated energy consumption of soft steel and friction damper and a coordinated energy consumption method. Background Art

[0002] Antique buildings are buildings that imitate the shape and appearance of ancient buildings under modern technical conditions using modern building materials, and use the shapes and components of traditional ancient buildings as decorations, thereby showing the classical beauty of ancient buildings. The use of steel structures in antique buildings can not only inherit and create new buildings with historical characteristics and regional styles, but also give full play to the advantages of steel structures such as high strength-to-weight ratio, high degree of industrialized production, environmental protection, and short construction period.

[0003] The bracket components are installed between the columns and beams. In addition to being decorative and aesthetically pleasing, they also serve as beam supports, which can shorten the span of the beam, reduce the load on the beam head, increase the shear capacity of the beam head, and prevent the beam and column from deforming and tilting.

[0004] As one of the energy dissipation technologies, installing energy dissipation devices in components is an effective way to improve the seismic performance of structural systems. The soft steel-friction damper collaborative working device is a device that uses the friction energy dissipation of the friction energy dissipation plate and the plastic deformation of soft steel to consume the energy under the action of earthquakes. The device can not only provide additional stiffness for the structure, but also provide additional damping to reduce the degree of damage to the structure caused by earthquakes. The soft steel damper uses low yield point steel. It uses its low yield strength to yield before the structure under the action of earthquakes, produce plastic deformation and dissipate energy. Combining soft steel with friction dampers forms a soft steel-friction damper collaborative working device with stronger energy dissipation capacity, which has a significant effect on improving the seismic performance of the structural system.

[0005] The flange welding of the beam-column joint of the antique building steel structure, especially the welding seam between the beam end flange and the column, is prone to fracture, resulting in brittle failure of the beam-column joint and serious cracking of the bracket components at the beam-column joint. Therefore, solving the problem of damage to the beam-column joint of the antique steel structure building is of great significance to enhance the seismic performance of the antique steel structure building. Summary of the invention

[0006] In order to overcome the deficiencies of the above-mentioned prior art, the present invention optimizes the beam-column nodes of steel structure antique buildings. The present invention provides a device for increasing node energy consumption by arranging a soft steel-friction damper cooperative working device at the beam-column nodes. The device can consume the energy of the input earthquake during the loading process of the steel structure antique building, so that the welds at the connection between the beam end flange and the column are not easy to break, thereby reducing damage to the bracket components, which can not only improve the seismic performance of the steel structure antique building system, but also maintain the aesthetics of the structural system.

[0007] To achieve the above object, the embodiments of the present invention adopt the following technical solutions:

[0008] According to an embodiment provided by the present invention, the present invention provides a special-shaped steel node of antique buildings with cooperative energy dissipation of mild steel and friction damper, including a beam-column node composed of a round steel tube lower column, a square steel tube upper column and a rectangular cross-section steel beam;

[0009] The square steel tube upper column is inserted into the groove at the top of the round steel tube lower column, leaving a gap between the columns;

[0010] A bracket member is provided at the connection between the round steel tube lower column and the square steel tube upper column and between the rectangular section steel beam. The bracket member includes a lower bracket member, a bracket member and an upper bracket member. A soft steel-friction damper is provided inside the bracket member. The soft steel-friction damper is fixedly connected to the rectangular section steel beam through a beam connector. The connection node between the round steel tube lower column and the square steel tube upper column is connected through a soft steel connecting rod in the lower bracket member.

[0011] Under the action of low-cycle repeated loads, at least one friction energy dissipation plate in the mild steel-friction damper moves and rubs relative to the connection node between the rectangular cross-section steel beam and the round steel tube lower column and the square steel tube upper column; the mild steel connecting rod plastically deforms along the square steel tube upper column.

[0012] Preferably, the mild steel-friction damper is located between the square steel tube upper column and the rectangular cross-section steel beam.

[0013] Preferably, the mild steel-friction damper comprises a left constraint plate, a right constraint plate and a friction energy absorption plate, the left constraint plate and the right constraint plate are connected by high-strength bolts, and the friction energy absorption plate is padded between the left constraint plate and the right constraint plate connecting plate.

[0014] Preferably, the top of the right restraining plate is connected to a beam connector, and the beam connector is connected to a rectangular cross-section steel beam through a horizontal plate on the bottom surface of the beam.

[0015] Preferably, the bottom of the left restraining plate is connected to a horizontal plate on the side of the column, and a pair of horizontal plates on the side are connected to the upper column of the square steel tube through a soft steel connecting rod.

[0016] Preferably, the left constraint plate is connected in parallel with the right constraint plate, and the left constraint plate and the right constraint plate are respectively connected to the horizontal plate on the side of the column and the beam connector at an angle of 45°.

[0017] Preferably, the lower bucket component and the upper bucket component are inverted trapezoidal platform structures, the lower surface of the lower bucket component is inscribed in the lower column of the round steel pipe; the horizontal plate on the inner side of the lower bucket component is connected to the upper column of the square steel pipe; the horizontal plate on the bottom surface of the upper beam of the upper bucket component is welded to the rectangular cross-section steel beam.

[0018] Preferably, the bracket member is a rectangular parallelepiped structure with a guide arc at the end, the top of the bracket member is connected to the trapezoidal platform at the bottom of the upper bucket member, and the lower part of the side wall is tangent to the upper part of the inverted trapezoidal platform.

[0019] Preferably, the node between the round steel tube lower column and the square steel tube upper column is a conversion column, a square ribbed plate is provided inside the top of the round steel tube lower column, the square steel tube upper column passes through the column top reinforcement ring and extends into the top of the round steel tube lower column, and the square steel tube upper column is inserted into the round steel tube lower column part and welded through the square ribbed plate.

[0020] The present invention further provides a method for cooperative energy dissipation of a mild steel-friction damper for special-shaped steel nodes of antique buildings, comprising:

[0021] Apply low-cycle repeated loads to the square steel tube upper column to simulate actual earthquake loads;

[0022] Under the action of low-cycle repeated loads, rotation and relative displacement occur between the various components of the special-shaped steel nodes of antique buildings, lateral displacement occurs on the upper column of the square steel tube, and rotation and relative displacement occur between the rectangular cross-section steel beam and the lower column of the round steel tube and the upper column of the square steel tube;

[0023] The friction damper between the square steel tube upper column and the rectangular section steel beam consumes the rotation energy between the square steel tube upper column and the rectangular section steel beam by using the relative movement of the friction energy dissipation plate; at the same time, the soft steel connecting rod plastically deforms under the action of the relative rotation angle to consume the displacement energy between the square steel tube upper column and the rectangular section steel beam.

[0024] The present invention has the following beneficial effects:

[0025] 1) Using soft steel-friction dampers to connect the beam-column nodes of antique building steel structures can avoid the flange welding, especially the welds connecting the flanges of the beam ends and the columns, which are easy to break, causing brittle failure of the beam-column nodes and serious cracking of the bracket components at the beam-column nodes. The beam-column nodes, bracket components, bracket components and soft steel-friction dampers form a soft steel-friction damper collaborative working device with stronger energy dissipation capacity, which has a significant effect on improving the seismic performance of the structural system.

[0026] 2) Installing friction dampers at the beam-column nodes of antique building steel structures can not only provide a certain amount of additional stiffness to the nodes, but also use the relative friction of the friction energy-absorbing plate to consume the seismic energy input during the loading process; using soft steel connecting rods at the connection between the friction damper and the column can not only use the deformation of the soft steel through its own physical properties under the action of angular displacement to consume the energy transmitted to the column wall parent material, but also work in conjunction with the friction damper to reduce the seismic energy transmitted to the structural system itself; the soft steel connecting rod and the friction damper work together to consume the seismic energy transmitted to the components of the beam-column node, more effectively improve the seismic performance of the structural system, and maintain the aesthetics of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a three-dimensional diagram of the overall structure of the present invention;

[0028] Figure 2 is a front view of the present invention;

[0029] Figure 3 It is a diagram of the soft steel-friction damper cooperative working device of the present invention;

[0030] Figure 4 is a diagram of a mild steel connecting member of the present invention;

[0031] Figure 5 It is a diagram of a bracket component of the present invention;

[0032] Figure 6 is a cross-sectional view of beam-column welding of the present invention;

[0033] Figure 7 It is a schematic diagram of the structure of the column top reinforcement ring and the square ribbed plate of the present invention.

[0034] Among them, 1 is a round steel tube lower column, 2 is a square steel tube upper column, 3 is a rectangular section steel beam, 4 is a square ribbed plate, 5 is a column top reinforcement ring, 6 is a soft steel connecting rod, 7 is a column side horizontal plate, 8 is a beam connector, 9 is a beam bottom horizontal plate, 10 is a left constraint plate, 11 is a right constraint plate, 12 is a friction energy absorption plate, 13 is a high-strength bolt, 14 is a bolt gasket, 15 is an annular reserved hole, 16 is a lower bucket component, 17 is a bracket component, and 18 is an upper bucket component. DETAILED DESCRIPTION

[0035] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] like Figure 1 , Figure 2 As shown, the present invention provides a special-shaped steel node of antique buildings with coordinated energy dissipation of mild steel-friction damper, including a beam-column node composed of a round steel tube lower column 1, a square steel tube upper column 2 and a rectangular section steel beam 3. A bracket member is arranged at the connection between the round steel tube lower column 1 and the square steel tube upper column 2 and between the rectangular section steel beam 3. The bracket member includes a lower bracket member 16, a bracket member 17 and an upper bracket member 18. A mild steel-friction damper is arranged in the bracket member 17. The mild steel-friction damper is fixedly connected to the rectangular section steel beam 3 through a beam connector 8, and the round steel tube lower column 1 and the square steel tube upper column 2 are connected at the node through a mild steel connecting rod in the lower bracket member 16.

[0037] See also Figure 1 As shown, a square steel tube upper column 2 is arranged at the top of the round steel tube lower column 1 of the beam-column node. The square steel tube upper column 2 passes through the column top reinforcement ring 5 and extends into the top of the round steel tube lower column 1. The square steel tube upper column 2 is inserted into the round steel tube lower column 1 through a square ribbed plate 4 and is welded and connected.

[0038] See also Figure 3As shown, the mild steel-friction damper includes a left constraint plate 10, a right constraint plate 11, a friction energy dissipation plate 12 and a high-strength bolt 13. The left constraint plate 10, the right constraint plate 11 end and the friction energy dissipation plate 12 are provided with an annular reserved hole 15. The high-strength bolt 13 passes through the annular reserved hole 15 to plug and connect the left constraint plate 10 and the right constraint plate 11 to each other. The friction energy dissipation plate 12 is padded between the connection parts of the left constraint plate 10 and the right constraint plate 11. The top of the right constraint plate 11 is connected to the beam connector 8, and the beam connector 8 is connected to the rectangular cross-section steel beam 3 through the horizontal plate 9 on the bottom of the beam. The connection part of the beam connector 8 and the horizontal plate 9 on the bottom of the beam is a convex-concave plug-in structure. The high-strength bolt 13 passes through the connection part padded with the bolt gasket 14 to connect the two. The bottom of the left constraint plate 10 is vertically connected to the column side horizontal plate 7, and two pairs of mild steel connecting rods 6 are connected through a pair of side horizontal plates 7 to connect the square steel pipe upper column 2.

[0039] In one embodiment, the left constraint plate 10 is composed of two pieces, which are respectively connected to the two column side horizontal plates 7 by welding at 45 degrees, and the right constraint plate 11 is composed of two pieces, which are respectively connected to the left constraint plate 10 in parallel, and the other side of the left constraint plate 10 is connected to the beam connector 8 by welding at 45 degrees. Three friction energy dissipation plates 12 are arranged at the connection part of the left constraint plate 10 and the right constraint plate 11, which are respectively sandwiched between the left constraint plate 10 and the right constraint plate 11.

[0040] See also Figure 4 As shown, the mild steel connecting member connects the mild steel connecting rod 6 with the horizontal plate 7 on the side of the column through high-strength bolts 13 to ensure that the mild steel-friction damper cooperative working device is tightly connected to the square steel tube upper column 2.

[0041] See also Figure 5 As shown, the dougong component includes a lower dougong component 16, a gong component 17 and an upper dougong component 18, and a soft steel-friction damper cooperative working device is arranged inside. The lower dougong component 16 and the upper dougong component 18 are inverted trapezoidal platform structures, the lower surface of the lower dougong component 16 is inscribed in the lower column 1 of the round steel pipe, and the horizontal plate 7 on the inner side of the lower dougong component 16 is connected to the upper column 2 of the square steel pipe; the horizontal plate 9 on the bottom surface of the upper beam of the upper dougong component 18 is welded and connected to the rectangular cross-section steel beam 3. The gong component 17 is a rectangular parallelepiped structure with a guide arc at the end, the top of the gong component 17 is connected to the trapezoidal platform at the bottom of the upper dougong component 18, and the lower part of the side wall is tangent to the upper part of the inverted trapezoidal platform.

[0042] The lower bucket component 16 is welded from 10 steel plates, and its lower surface is inscribed in the lower column 1 of the round steel tube. The side length of the upper surface area is 10 cm longer than the side length of the lower surface, presenting an inverted platform shape. The bracket component 17 is welded from 14 steel plates, and the lower part is a rectangular parallelepiped, one side of which is welded to the upper column 2 of the square steel tube and the lower bucket component 16, and the other side is set in an arc shape and welded to the lower part of the upper bucket component 18. The upper part of the upper bucket component 18 is welded to the rectangular cross-section steel beam 3, presenting an inverted platform shape.

[0043] See also Figure 6 As shown, the round steel tube lower column 1 and the square steel tube upper column 2 are conversion columns, and the square steel tube upper column 2 passes through the top of the round steel tube lower column 1, wherein the cylindrical ribbed plate 4 penetrates into the top of the round steel tube lower column 1 and is welded at the contact position, and the column top reinforcement ring 5 is welded on the top of the round steel tube lower column 1 and connected to the square steel tube upper column 2.

[0044] See also Figure 7 As shown, the column top reinforcement ring 5 is a circular ring, and the cylindrical ribbed plate 4 is radially connected to the circular steel pipe lower column 1 from the column top reinforcement ring 5.

[0045] The specific installation steps are as follows:

[0046] Step 1: Weld the square steel tube upper column 2 inside the round steel tube lower column 1, and connect them through the square ribbed plate 4; weld the column top reinforcement ring 5 on the top of the round steel tube lower column 1, and connect it with the square steel tube upper column 2 by welding; weld the rectangular cross-section steel beam 3 to the upper part of the square steel tube upper column 2 to form a beam-column node system with a steel structure antique building.

[0047] Step 2: Use high-strength bolts 13 and bolt washers 14 to tightly connect the two column side horizontal plates 7 through mild steel connecting rods 6 on the square steel tube upper column 2.

[0048] Step 3: Weld two left restraining plates 10 on the other side of the right column side horizontal plate 7, with a welding angle of 45°.

[0049] Step 4: Install the friction energy dissipation plate 12 on the lower side of the two left constraint plates 10, and connect the right constraint plate 11 and the friction energy dissipation plate 12 in sequence, and fasten them through the high-strength bolts 13 and bolt washers 14 on the annular reserved holes 15 thereof.

[0050] Step 5: Tightly connect the beam bottom horizontal plate 9 to the beam connector 8 through high-strength bolts 13 and bolt washers.

[0051] Step 6: Weld and connect the rectangular cross-section steel beam 3 just above the horizontal plate 9 on the bottom surface of the beam.

[0052] Step 7: Weld the bucket component 16 at the upper part of the connection between the round steel tube lower column 1 and the square steel tube upper column 2.

[0053] Step eight: weld the lower end of the bracket member 17 to the bucket member 16, weld the upper end of the bracket member 17 to another bucket member 18, and weld the bucket member 18 to the lower flange 3 of the steel beam.

[0054] Note: All welds are seamless to ensure welding rigidity.

[0055] The soft steel-friction damper coordinated energy dissipation method of the special-shaped steel node of antique building of the present invention comprises:

[0056] 1) Apply low-cycle repeated loads to the square steel tube upper column to simulate actual earthquake loads;

[0057] 2) Under the action of low-cycle repeated loads, the beam-column node deforms greatly under the action of rotation and relative displacement, the square steel tube upper column displaces laterally, and the rectangular section steel beam and the round steel tube lower column and the square steel tube upper column rotate and displace relative to each other, resulting in serious cracking of the connection weld between the rectangular section steel beam and the square steel tube upper column, serious damage to the parent material of the square steel tube upper column wall, and brittle fracture of the beam-column node. At the same time, cracks occur at the welding point between the bracket component and the beam column, and the bracket component is seriously deformed;

[0058] The beam-column node deforms greatly under the action of rotation and relative displacement. The friction damper between the square steel tube upper column and the rectangular section steel beam consumes the rotation energy between the square steel tube upper column and the rectangular section steel beam by using the friction energy dissipation plate to dissipate friction energy. At the same time, the soft steel connecting rod plastically deforms under the action of relative rotation to consume the energy under the action of earthquake, and the beam-column node achieves self-reset. Therefore, the friction damper and the soft steel connecting rod work together to consume the damage to the beam-column node caused by relative rotation and absorb the energy under the action of relative displacement, effectively suppressing the cracking of the weld between the beam-column node, protecting the integrity of the bracket components, improving the seismic performance of the structural system and maintaining its aesthetics.

[0059] The working mechanism of the present invention is: the soft steel-friction damper cooperative working device can not only provide sufficient rigidity, but also rely on the friction between the friction energy absorbing plates to absorb earthquake energy and reduce earthquake damage; to ensure the reliable operation of the friction damper, the horizontal plate on the side of the column, the beam connecting part, the horizontal plate on the bottom of the beam, the left constraint plate, the right constraint plate and the friction energy absorbing plate must be firm and rigid, and the square ribbed plate and the column top reinforcement ring must be firmly connected during assembly; the pre-tension loss in the high-strength bolts must be kept at a low level to avoid excessive changes in friction between the friction energy absorbing plates, thereby affecting the energy dissipation capacity of the soft steel-friction damper cooperative working device.

[0060] When the earthquake action is small, the soft steel-friction damper cooperative working device at the connection between the beams and columns of the steel structure antique building can provide a certain rigidity to the entire structure. When the earthquake action increases, the soft steel-friction damper cooperative working device converts kinetic energy into internal energy generated by friction. Since the ends of the soft steel-friction damper cooperative working device are subject to hinge constraints, a resistance bending moment is generated in the damping system, and the friction energy-absorbing plates are pressed and rubbed against each other, which enhances the bending resistance and rigidity of the node. The use of soft steel as a connecting rod can not only realize the energy-absorbing characteristics of its own material, but also increase the energy-absorbing capacity of the friction damper, effectively improving the working capacity of the friction damper, thereby reducing the damage to the bracket components between the nodes of the steel structure antique building, not only improving the seismic performance of the structural system, but also ensuring the aesthetics.

[0061] The present invention is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed in the present invention, technicians in this field can make some substitutions and deformations to some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present invention.

Claims

1. A special-shaped steel node of antique building with soft steel and friction damper for collaborative energy dissipation, characterized in that: It includes a beam-column node composed of a circular steel tube lower column, a square steel tube upper column and a rectangular cross-section steel beam; The square steel tube upper column is inserted into the groove at the top of the round steel tube lower column, leaving a gap between the columns; A bracket member is provided at the connection between the round steel tube lower column and the square steel tube upper column and between the rectangular section steel beam. The bracket member includes a lower bracket member, a bracket member and an upper bracket member. A soft steel-friction damper is provided inside the bracket member. The soft steel-friction damper is fixedly connected to the rectangular section steel beam through a beam connector. The connection node between the round steel tube lower column and the square steel tube upper column is connected through a soft steel connecting rod in the lower bracket member. Under the action of low-cycle repeated loads, at least one friction energy dissipation plate in the mild steel-friction damper moves and rubs relative to the connection node between the rectangular cross-section steel beam and the round steel tube lower column and the square steel tube upper column; the mild steel connecting rod dissipates energy through plastic deformation along the square steel tube upper column.

2. The antique building special-shaped steel node with soft steel-friction damper synergistic energy dissipation according to claim 1 is characterized in that: The mild steel-friction damper is located between the square steel tube upper column and the rectangular cross-section steel beam.

3. The antique building special-shaped steel node with soft steel-friction damper synergistic energy dissipation according to claim 1 is characterized in that: The mild steel-friction damper comprises a left constraint plate, a right constraint plate and a friction energy dissipation plate. The left constraint plate and the right constraint plate are connected by high-strength bolts, and the friction energy dissipation plate is padded between the left constraint plate and the right constraint plate connecting plate.

4. The antique building special-shaped steel node with soft steel-friction damper synergistic energy dissipation according to claim 3 is characterized in that: The top of the right restraining plate is connected to a beam connector, and the beam connector is connected to a rectangular cross-section steel beam through a horizontal plate on the bottom surface of the beam.

5. The antique building special-shaped steel node with soft steel-friction damper synergistic energy dissipation according to claim 4 is characterized in that: The bottom of the left constraint plate is connected to the side horizontal plate of the column, and a pair of side horizontal plates are connected to the square steel pipe upper column through a soft steel connecting rod.

6. The antique building special-shaped steel node with soft steel-friction damper synergistic energy dissipation according to claim 5 is characterized in that: The left constraint plate is connected in parallel with the right constraint plate, and the left constraint plate and the right constraint plate are respectively connected to the horizontal plate on the side of the column and the beam connecting member at an angle of 45 degrees.

7. The antique building special-shaped steel node with soft steel-friction damper synergistic energy dissipation according to claim 1 is characterized in that: The node between the round steel tube lower column and the square steel tube upper column is a conversion column. A square ribbed plate is provided inside the top of the round steel tube lower column. The square steel tube upper column passes through a column top reinforcement ring and extends into the top of the round steel tube lower column. The square steel tube upper column is inserted into the round steel tube lower column part and welded through the square ribbed plate.

8. A method for synergistic energy dissipation of mild steel and friction damper based on the special-shaped steel node of antique building according to any one of claims 1 to 7, characterized in that: include: Apply low-cycle repeated loads to the square steel tube upper column to simulate actual earthquake loads; The square steel tube upper column undergoes lateral displacement, and the rectangular cross-section steel beam, the round steel tube lower column and the square steel tube upper column produce rotation and relative displacement; The friction energy dissipation plate of the soft steel-friction damper moves relative to each other and consumes the rotation energy between the square steel tube upper column and the rectangular section steel beam; the soft steel connecting rod of the soft steel-friction damper produces plastic deformation and consumes the displacement energy between the square steel tube upper column and the rectangular section steel beam.

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