High-bearing-capacity fabricated steel structure column base joint

Abstract

The invention relates to the technical field of assembly type column base nodes, in particular to a high-bearing-capacity assembly type steel structure column base node which comprises an upper bottom plate, a lower bottom plate and a buckling-restrained energy consumption plate, an upper energy consumption plate is fixed to the bottom of the upper bottom plate, and a lower energy consumption plate is fixed to the top of the lower bottom plate. Buckling-restrained energy dissipation plates which are spaced left and right are fixed between the upper energy dissipation plate and the lower energy dissipation plate, and the upper bottom plate, the upper energy dissipation plate, the lower energy dissipation plate and the lower bottom plate are fixedly installed together through at least four extension anchor bolts with the lower ends pre-embedded in a foundation. The structure is reasonable and compact, and the rigidity and the bearing capacity of the joint are regulated and controlled by changing the thickness of the middle buckling-restrained energy consumption plates and the thickness of the inner energy consumption plates, so that the high bearing capacity performance target is achieved. Under the action of an ultra-large earthquake, the extension anchor bolt on the outermost side yields firstly, then yields the buckling-restrained energy dissipation plate, and finally yields the internal energy dissipation plate, so that a multi-stage energy dissipation system in a plastic stage is formed, and the anti-seismic property of the structure is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of prefabricated column base joint technology, and is a high-load-bearing prefabricated steel structure column base joint. Background Technology

[0002] Steel structures have been widely used in the field of new building industrialization in recent years due to their advantages such as short construction cycle, high building quality, and green, low-carbon, and environmentally friendly characteristics. They have made outstanding contributions to "ensuring the speed of post-disaster reconstruction and improving earthquake resistance and safety." Steel structure column bases can be classified into three types according to their structural form: exposed column bases, enclosed column bases, and embedded column bases. They can also be classified into three types according to the support type: rigid column bases, semi-rigid column bases, and hinged column bases. Traditional cast-in-place column bases achieve joint connections through on-site casting operations. However, this method suffers from low labor efficiency, long construction cycles, inconvenience in rebar cage binding and concrete formwork pouring, numerous overlapping operations between steel and concrete structures, low construction precision, and significant environmental pollution, all of which restrict the development direction of new building industrialization. While existing exposed column bases are easy to assemble, they have low load-bearing capacity and stiffness, poor energy dissipation capacity, and anchor bolts are prone to elongation and plastic deformation, leading to significant slippage and damage to the column base. Therefore, a new type of prefabricated steel structure column base joint that meets high load-bearing capacity requirements is needed to solve these problems.

[0003] Currently, research on novel prefabricated steel structure column base joints in my country is relatively limited, with related findings mainly focusing on the mechanical properties of traditional column base joints. Furthermore, these are mostly constructed in areas with low seismic intensity, failing to meet the seismic fortification requirements of high-intensity earthquake zones. Therefore, researching a prefabricated steel structure column base joint with high load-bearing capacity, good seismic performance, rapid assembly, reliable connection quality, and no need for on-site concrete pouring is crucial for promoting the industrialization of new building types and expanding the application scope of prefabricated steel structure column bases. Summary of the Invention

[0004] This invention provides a high-load-bearing prefabricated steel structure column base node, which overcomes the shortcomings of the prior art. It can effectively solve the problems of low load-bearing capacity and stiffness, poor energy dissipation capacity, and easy elongation of anchor bolts leading to plastic deformation, resulting in obvious slippage and damage to the column base.

[0005] The technical solution of the present invention is achieved through the following measures: a high load-bearing capacity prefabricated steel structure column base node, including an upper base plate, a lower base plate and a buckling-resistance energy dissipation plate, an upper energy dissipation plate is fixed to the bottom of the upper base plate, a lower energy dissipation plate is fixed to the top of the lower base plate, and buckling-resistance energy dissipation plates are fixed between the upper energy dissipation plate and the lower energy dissipation plate at left and right intervals. The upper base plate, the upper energy dissipation plate, the lower energy dissipation plate and the lower base plate are fixed together by at least four elongated anchor bolts with their lower ends pre-embedded in the foundation.

[0006] Each of the aforementioned buckling-resistance energy dissipation plates includes at least three vertical steel plates in a front-to-back direction, with a horizontal steel plate in a left-to-right direction fixed between adjacent vertical steel plates.

[0007] A pair of internal energy dissipation plates are fixed between the upper and lower energy dissipation plates, and the internal energy dissipation plates are located between the buckling-resistant energy dissipation plates.

[0008] An upper ear plate is fixed to the bottom of the upper energy-consuming plate between the aforementioned internal energy-consuming plates, and a lower ear plate is fixed to the top of the lower energy-consuming plate between the internal energy-consuming plates. The pin holes of the upper ear plate and the lower ear plate are aligned vertically and fixed with high-strength pins.

[0009] The bottom of the upper base plate is fixedly installed to the upper energy-consuming plate by high-strength bolts, and the top of the lower base plate is fixedly installed to the lower energy-consuming plate by column anchor bolts pre-embedded in the foundation at the lower end.

[0010] An I-shaped column is fixed to the top of the aforementioned upper base plate.

[0011] The top of the aforementioned upper base plate is fixed with stiffening ribs between it and the I-shaped column.

[0012] This invention features a rational and compact structure. By altering the thickness of the central buckling-resistance energy-dissipating plate and the internal energy-dissipating plate, it achieves high load-bearing capacity by regulating the stiffness and load-bearing capacity of the joints. Under extremely severe earthquakes, the outermost elongated anchor bolts yield first, followed by the buckling-resistance energy-dissipating plate, and finally the internal energy-dissipating plate, forming a multi-stage energy-dissipating system in the plastic stage, effectively improving the structure's seismic performance. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0014] Figure 2 for Figure 1 A schematic diagram of the three-dimensional structure rotated 90 degrees in the opposite direction.

[0015] Figure 3 for Figure 1 A schematic diagram of the main structure.

[0016] Figure 4 for Figure 3 A side view structural diagram.

[0017] Figure 5 for Figure 3 A top-view structural diagram.

[0018] Figure 6 A three-dimensional structural diagram of an energy-dissipating plate designed to prevent buckling.

[0019] Figure 7 This is a color schematic diagram of the three-dimensional structure of the present invention.

[0020] The codes in the attached diagram are as follows: 1. Upper base plate; 2. Lower base plate; 3. Upper energy dissipation plate; 4. Lower energy dissipation plate; 5. Extending anchor bolt; 6. Vertical steel plate; 7. Horizontal steel plate; 8. Internal energy dissipation plate; 9. Upper ear plate; 10. Lower ear plate; 11. High-strength pin; 12. High-strength bolt; 13. Column base anchor bolt; 14. I-beam column; 15. Stiffening rib; 16. Nut. Detailed Implementation

[0021] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.

[0022] In this invention, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as the positional relationships of front, back, top, bottom, left, and right, which are based on the instructions attached. Figure 1 The orientation of the layout is determined by the direction of the map.

[0023] The present invention will be further described below with reference to embodiments and accompanying drawings: Example 1: As shown in the attached document Figure 1-4 As shown, the high-load-bearing prefabricated steel structure column base node includes an upper base plate 1, a lower base plate 2, and a buckling-restrained energy-dissipating plate. An upper energy-dissipating plate 3 is fixed to the bottom of the upper base plate 1, and a lower energy-dissipating plate 4 is fixed to the top of the lower base plate 2. Buckling-restrained energy-dissipating plates are fixed between the upper energy-dissipating plate 3 and the lower energy-dissipating plate 4 at left and right intervals. The upper base plate 1, upper energy-dissipating plate 3, lower energy-dissipating plate 4, and lower base plate 2 are fixed together by at least four elongated anchor bolts 5 whose lower ends are pre-embedded in the foundation. The elongated anchor bolts 5 are pre-embedded in the foundation, and the upper base plate 1, upper energy-dissipating plate 3, lower energy-dissipating plate 4, and lower base plate 2 are connected through nuts 16 to form a complete column base.

[0024] Example 2: As shown in the attached document Figure 1-4 As shown, each buckling-restrained energy-dissipating plate includes at least three vertical steel plates 6 arranged in a front-to-back direction. Adjacent vertical steel plates 6 are fixed with horizontal steel plates 7 arranged in a left-to-right direction. These horizontal steel plates 7 are formed by welding five steel plates of equal length together. The three parallel vertical steel plates 6 are welded together by two perpendicular horizontal steel plates 7, which act as buckling restraints. The stiffness and load-bearing capacity of the nodes can be controlled by changing the thickness of the central buckling-restrained energy-dissipating plate.

[0025] Example 3: A pair of internal energy-dissipating plates 8 are fixedly spaced between the upper energy-dissipating plate 3 and the lower energy-dissipating plate 4, with the internal energy-dissipating plates 8 located between the buckling-resistance energy-dissipating plates. The stiffness and load-bearing capacity are adjusted by changing the thickness of the internal energy-dissipating plates 8. They function as yield energy dissipation plates under bending moment.

[0026] Example 4: An upper ear plate 9 is fixed to the bottom of the upper energy-dissipating plate 3 between the internal energy-dissipating plates 8, and a lower ear plate 10 is fixed to the top of the lower energy-dissipating plate 4 between the internal energy-dissipating plates 8. The pin holes of the upper ear plate 9 and the lower ear plate 10 correspond vertically and are fixed with high-strength pins 11. The two ear plates are connected by high-strength pins 11 to form a stable vertical force transmission.

[0027] Example 5: The bottom of the upper base plate 1 is fixedly installed to the upper energy dissipation plate 3 by high-strength bolts 12, and the top of the lower base plate 2 is fixedly installed to the lower energy dissipation plate 4 by column foot anchors 13 pre-embedded in the foundation at the lower end.

[0028] Example 6: An I-shaped column 14 is fixed to the top of the upper base plate 1. The I-shaped column 14 is generally an I-shaped steel column. Stiffening ribs 15 are fixed between the top of the upper base plate 1 and the I-shaped column 14. The I-shaped column 14 and the surrounding stiffening ribs 15 are welded together to the upper base plate 1. This achieves a stable force transmission effect. The chamfer angle of the stiffening ribs should preferably be between 45° and 60° to enhance the stiffness and bending resistance of the joint area.

[0029] Different parts of this invention are used to transmit different forces. The axial force of the upper structure can be transmitted downwards from the I-beam column 14 to the upper base plate 1, and then through the upper energy-dissipating plate 3 to the elongated anchor bolts 5, the buckling-resistance energy-dissipating plate and the internal energy-dissipating plate 8, the upper ear plate 9, the lower ear plate 10, and the high-strength pin 11. It is then transmitted from the lower energy-dissipating plate 4 to the lower base plate 2, and finally to the foundation. The horizontal shear force borne by this invention can be transmitted through the shear-resistant key formed by the firmly bonded upper ear plate 9, lower ear plate 10, and high-strength pin 11, as well as the friction between the upper base plate 1 and the upper energy-dissipating plate 3, and the friction between the lower base plate 2 and the lower energy-dissipating plate 4. The bending moment of this invention can be transmitted through the moment formed by the elongated anchor bolts 5 around the perimeter, the buckling-resistance energy-dissipating plate, and the internal energy-dissipating plate 8 being under tension on one side and compression on the other.

[0030] This invention achieves high load-bearing capacity by adjusting the thickness of the buckling-resistance energy-dissipating plate in the middle and the inner energy-dissipating plate 8, thereby controlling the stiffness and load-bearing capacity of the nodes. Under ultra-large earthquakes, the outermost elongated anchor bolt 5 yields first, then the buckling-resistance energy-dissipating plate yields, and finally the inner energy-dissipating plate 8 yields, forming a multi-stage energy-dissipating system in the plastic stage, which greatly improves the seismic performance of the structure.

[0031] The above technical features constitute various embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A high-load-bearing prefabricated steel structure column base joint, characterized in that... It includes an upper base plate, a lower base plate, and a buckling-resistance energy dissipation plate. The upper energy dissipation plate is fixed to the bottom of the upper base plate, and the lower energy dissipation plate is fixed to the top of the lower base plate. Buckling-resistance energy dissipation plates are fixed between the upper and lower energy dissipation plates at left and right intervals. The upper base plate, the upper energy dissipation plate, the lower energy dissipation plate, and the lower base plate are fixed together by at least four elongated anchor bolts with their lower ends pre-embedded in the foundation.

2. The high-bearing-capacity prefabricated steel structure column base node according to claim 1, characterized in that... Each buckling-resistance energy dissipation plate includes at least three vertical steel plates in a front-to-back direction, with horizontal steel plates in a left-to-right direction fixed between adjacent vertical steel plates.

3. The high-bearing-capacity prefabricated steel structure column base node according to claim 1 or 2, characterized in that... A pair of internal energy dissipation plates are fixed between the upper and lower energy dissipation plates, and the internal energy dissipation plates are located between the anti-buckling energy dissipation plates.

4. The high-bearing-capacity prefabricated steel structure column base node according to claim 3, characterized in that... An upper ear plate is fixed to the bottom of the upper energy-consuming plate between the internal energy-consuming plates, and a lower ear plate is fixed to the top of the lower energy-consuming plate between the internal energy-consuming plates. The pin holes of the upper ear plate and the lower ear plate are aligned and fixed with high-strength pins.

5. The high-bearing-capacity prefabricated steel structure column base node according to claim 1, 2, or 3, characterized in that... The bottom of the upper base plate is fixedly installed to the upper energy-consuming plate with high-strength bolts, and the top of the lower base plate is fixedly installed to the lower energy-consuming plate with column anchor bolts pre-embedded in the foundation at the lower end.

6. The high-load-bearing prefabricated steel structure column base node according to claim 4, characterized in that... The bottom of the upper base plate is fixedly installed to the upper energy-consuming plate with high-strength bolts, and the top of the lower base plate is fixedly installed to the lower energy-consuming plate with column anchor bolts pre-embedded in the foundation at the lower end.

7. The high-bearing-capacity prefabricated steel structure column base node according to claim 1, 2, 4, or 6, characterized in that... An I-shaped column is fixed to the top of the base plate.

8. The high-bearing-capacity prefabricated steel structure column base node according to claim 3, characterized in that... An I-shaped column is fixed to the top of the base plate.

9. The high-bearing-capacity prefabricated steel structure column base node according to claim 5, characterized in that... An I-shaped column is fixed to the top of the base plate.

10. The high-bearing-capacity prefabricated steel structure column base node according to claim 9, characterized in that... Stiffening ribs are fixed between the top of the upper base plate and the I-shaped column.

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