A constant-resistance energy-absorbing joint for engineering structures

Abstract

The present invention provides a constant-resistance energy-absorbing node for engineering structures, which includes a single-ear plate node plate and a double-ear plate node plate. The single-ear plate node plate includes a first end plate and a first ear plate fixed on one side of the first end plate. The double-ear plate node plate includes a second end plate and two second ear plates fixed on one side of the second end plate. The second ear plates are arranged at intervals, and the first ear plate is located between the two second ear plates. The first ear plate and the second ear plates are rotatably connected by a rotating shaft to form a rotating node. Two NPR round steel bars are provided on each side of the rotating node, and the two NPR round steel bars on the same side are arranged vertically opposite to each other to form an annular steel ring coaxial with the rotating shaft. One end of the NPR round steel bar is fixedly connected to the first ear plate, and the other end is fixedly connected to the second ear plate. The present invention has the advantages of simple structure, convenient connection and high strength; the resistance to rotation is generated by the deformation of the NPR round steel bar, and the constant resistance is provided by large deformation. The present invention can absorb a part of the strain energy generated by seismic action, so as to achieve the effect of energy absorption and shock reduction.

Description

Technical Field

[0001] The present invention relates to the technical field of equipment for building earthquake resistance, and particularly relates to an engineering structure constant-resistance energy-absorbing node suitable for earthquake resistance of building structures. Background Art

[0002] Wind loads and seismic actions will have a great impact on or even damage building structures, thus threatening people's lives and property safety. Therefore, it is very important and necessary to strengthen the earthquake-resistant energy dissipation ability of building structures and effectively improve the reliability of building structures under seismic actions.

[0003] Currently, the main earthquake-resistant energy dissipation measures are mainly to set earthquake-resistant energy dissipation dampers at key positions of building structures. The commonly used dampers mainly include tuned mass dampers, viscous dampers, ductile bearings, seismic isolation rubber bearings, and friction dampers, etc. These dampers are installed in building engineering structures to play a role in shock absorption and energy dissipation, and can effectively reduce the impact of vibrations on the structure. However, each of these dampers has its own defects. For example, most of the tuned mass dampers have complex structures, large volumes, and high manufacturing costs, and are not suitable for all building structures; the seismic isolation rubber bearing dampers are prone to aging, and it is relatively difficult to replace them after aging; the viscous dampers and the like have relatively complex structures and high manufacturing costs, etc. The existing dampers fail to integrate the advantages of simple structure, convenient production and installation, stable structure, and good shock absorption and energy dissipation effects. Summary of the Invention

[0004] To solve the problems in the background art, the present invention proposes an energy-absorbing node for engineering structures that integrates simple structure, convenient production and installation, stable structure, and good shock absorption and energy dissipation effects. It includes a single-ear plate node plate and a double-ear plate node plate. The single-ear plate node plate includes a first end plate and a first ear plate fixed on one side of the first end plate. The double-ear plate node plate includes a second end plate and two second ear plates fixed on one side of the second end plate. The second ear plates are arranged at intervals, the first ear plate is located between the two second ear plates, and the first ear plate and the second ear plates are rotationally connected by a rotating shaft to form a rotating node. On both sides of the rotating node, there are two NPR round steels each. The two NPR round steels on the same side are arranged up and down relatively to form an annular steel ring coaxial with the rotating shaft. One end of the NPR round steel is fixedly connected to the first ear plate, and the other end of the NPR round steel is fixedly connected to the second ear plate.

[0005] Preferably, there is a turntable on each side of the double-ear plate node plate. Both ends of the rotating shaft extend out of the second ear plate, and the turntable is coaxially fixed on the extended end of the rotating shaft. There is a groove on the edge of the turntable, and the inner ring side of the NPR round steel is embedded in the groove.

[0006] Preferably, the NPR round steel is connected to the single-ear plate gusset plate through a long connecting block, and the NPR round steel is connected to the double-ear plate gusset plate through a short connecting block. The long connecting block is fixed on the first ear plate, and the short connecting block is fixed on the second ear plate. The two ends of the NPR round steel located above are respectively fixed above the long connecting block and above the short connecting block, and the two ends of the NPR round steel located below are respectively fixed below the long connecting block and below the short connecting block.

[0007] Preferably, the minimum distance between the long connecting block and the double-ear plate gusset plate is not less than 5MM.

[0008] Preferably, the distance from the installation position of the long connecting block to the axis of the rotating shaft is equal to the distance from the installation position of the short connecting block to the axis of the rotating shaft.

[0009] Preferably, the single-ear plate gusset plate and the double-ear plate gusset plate are respectively connected to the engineering structure through the first end plate and the second end plate.

[0010] For the arc-shaped high-strength and high-ductility NPR round steel, according to the design requirements and referring to the relevant documents of NPR materials, the appropriate diameter size of the NPR round steel can be selected. The arc-shaped NPR round steel has the following several stress stages during use:

[0011] 1) Elastic stage:

[0012] When the nodal rotation angle α < 180f y,NPR / E, the arc-shaped NPR round steel provides linear resistance (see Equations 1 and 2), meets the structural load requirements and remains in an elastic state, maintaining the stability of the structure; under the action of vibration, when a single NPR round steel is still in the elastic stage, the node will rotate back and forth, generating angular displacement, playing an energy dissipation role.

[0013] f = E * α * (d / 2 + R); Equation 1

[0014] F = Π * f * (d / 2)2; Equation 2

[0015] 2) Constant resistance stage:

[0016] When the nodal rotation angle α > 180f y,NPR / E, the arc-shaped NPR round steel enters the yield stage and produces yield deformation. At this time, due to the special properties of the NPR material, the bearing capacity provided changes little. Therefore, the arc-shaped NPR round steel can provide a constant rotational resistance for the structure during vibration; at the same time, the yield strain range of the NPR round steel is relatively large, which can give the structural node a larger rotational space to fully absorb energy and achieve the shock absorption effect.

[0017] 3) Failure stage:

[0018] When the nodal rotation angle α reaches 180 fu,NPRWhen it reaches / E, the NPR round steel reaches its ultimate bearing capacity, and the joint loses its bearing capacity and fails. During design, the sizes of the arc-shaped NPR round steel and the joint need to be designed according to the required seismic requirements to ensure that the bearing capacity at the joint, especially the NPR round steel, meets the seismic requirements.

[0019] In the above formula: f is the stress of the NPR round steel; E is the elastic modulus of the NPR round steel; α is the rotational angle of the joint under force; d is the diameter of the turntable; R is the radius of the NPR round steel; F is the resistance provided by the NPR round steel; f y,NPR is the yield strength of the NPR material; f u,NPR is the ultimate strength of the NPR material.

[0020] The beneficial effects of the present invention are as follows: Compared with the previous dampers, the structure of the present invention is simple in form, without complex internal structures, and the shapes of its components are all simple and regular. The production and manufacturing are very convenient, and mass production can be achieved without specific molds and production technologies, while reducing costs. Moreover, due to the simple structure and no small and vulnerable structures, the transportation process of this constant-resistance energy-absorbing joint is very convenient.

[0021] The connection method of the present invention with the external engineering structure is also very convenient, easy to install and disassemble; initially, the rotating joint of the present invention can provide a certain angular deformation space. Under the action of normal loads, after the rotation angle of the joint stabilizes, the NPR round steel provides resistance to the rotation of the joint to maintain the structural stability. Under the action of an earthquake, when the rotation angle is greater than 180 fy,NPR / E, the NPR round steel can provide a constant rotational resistance, and by giving the joint a certain rotational space to absorb energy sufficiently, the effect of energy absorption and shock reduction can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 is an exploded view of the structure of the present invention;

[0024] Figure 3 is a front view of the present invention;

[0025] Figure 4 is a top view of the present invention;

[0026] Figure 5 is an application schematic diagram of the present invention in the beam-column joint of a building engineering structure.

[0027] Reference numerals in the figure: 1, single-ear plate gusset plate; 11, first end plate; 12, first ear plate; 2, double-ear plate gusset plate; 21, second end plate; 22, second ear plate; 3, rotating shaft; 4, turntable; 5, long connecting block; 6, short connecting block; 7, NPR round steel; 8, steel pipe column; 9, I-beam; 10, high-strength bolt. Detailed implementation manners

[0028] To make the present invention clearer and more understandable, the technical solutions of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the given embodiments are only one of the implementation manners and do not represent all embodiments.

[0029] In this article, terms such as "upper" and "lower" are established based on the positional relationship shown in the drawings. Depending on the different drawings, the corresponding positional relationship may also change accordingly. Therefore, it cannot be understood as an absolute limitation of the protection scope.

[0030] Combined with the attached Figures 1-5

[0031] Specifically, a turntable 4 is provided on each side of the double-ear plate gusset plate 2. Both ends of the rotating shaft 3 extend out of the second ear plate 22, and the turntable 4 is coaxially fixed on the extended end of the rotating shaft 3. A groove is provided on the edge of the turntable 4, and the inner ring side of the NPR round steel 7 is embedded in the groove. The turntable 4 is used to limit the axial movement of the single-ear plate gusset plate 1 and the double-ear plate gusset plate 2 along the rotating shaft 3, and the groove is used to limit the movement path of the NPR round steel 7.

[0032] Specifically, holes are provided on the first ear plate 12, the second ear plate 22, and the turntable 4. The rotating shaft 3 is inserted into the holes of the first ear plate 12, the second ear plate 22, and the turntable 4 to connect the three, forming a hinge joint.

[0033] Specifically, the NPR round steel 7 is connected to the single-ear plate gusset plate 1 through the long connection block 5, and the NPR round steel 7 is connected to the double-ear plate gusset plate 2 through the short connection block 6. The long connection block 5 is fixed on the first ear plate 12, and the short connection block 6 is fixed on the second ear plate 22. The two ends of the upper NPR round steel 7 are respectively fixed above the long connection block 5 and above the short connection block 6, and the two ends of the lower NPR round steel 7 are respectively fixed below the long connection block 5 and below the short connection block 6.

[0034] Specifically, the minimum distance between the long connection block 5 and the double-ear plate gusset plate 2 is not less than 5 mm.

[0035] Specifically, the distance from the installation position of the long connection block 5 to the axis of the rotating shaft 3 is equal to the distance from the installation position of the short connection block 6 to the axis of the rotating shaft 3.

[0036] Specifically, the single-ear plate gusset plate 1 and the double-ear plate gusset plate 2 are respectively connected to the engineering structure through the first end plate 11 and the second end plate 21. The connection method can be bolt connection or welding. For example, when installing an I-beam 9 between two steel pipe columns 8, the I-beam 9 and the steel pipe column 8 need to be connected through a constant-resistance energy-absorbing joint to achieve energy absorption and shock reduction. The first end plate 11 and the second end plate 21 of the constant-resistance energy-absorbing joint are respectively connected to the I-beam 9 and the steel pipe column 8 through high-strength bolts 10 or welding, forming a semi-rigid beam-column joint structure with the ability of rotational energy dissipation, which is convenient for installation and use.

[0037] When the constant-resistance energy-absorbing joint of the engineering structure is used as an anti-seismic joint of the building structure, from the beginning of being subjected to the load until failure, the constant-resistance energy-absorbing joint can be divided into three stages: the elastic stage, the constant-resistance stage, and the joint failure stage.

[0038] In the elastic stage, the deformation of the building structure is applied to the high-strength and high-ductility NPR round steel 7 through the slight rotation of the joint. The upper NPR round steel 7 is in tension, and the lower NPR round steel 7 is in compression. When the rotation angle of the hinge is less than 180 fy,NPR / E, the rotational resistance provided by the NPR round steel 7 is proportional to the rotation angle.

[0039] In the constant-resistance stage, when the earthquake action on the building structure reaches a certain level and the rotation angle of the joint is greater than 180 fy,NPR / E, the NPR round steel 7 provides a constant rotational resistance and provides a large deformation range, playing an energy dissipation effect.

[0040] In the failure stage, when the earthquake action on the building structure is too large and reaches the ultimate bearing capacity of the NPR round steel 7, the NPR round tube is damaged, and the joint loses the ability to provide constant resistance and finally fails.

[0041] The above embodiments only illustrate the basic principles and characteristics of the present invention, but are not limited by the above embodiments. It should be understood that for those of ordinary skill in the art, various changes and modifications can be made to the present invention without departing from the spirit and scope of the present invention, and these changes and modifications all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A constant-resistance energy-absorbing joint for engineering structures, comprising a single-ear plate joint plate (1) and a double-ear plate joint plate (2). The single-ear plate joint plate (1) includes a first end plate (11) and a first ear plate (12) fixed to one side of the first end plate (11). The double-ear plate joint plate (2) includes a second end plate (21) and two second ear plates (22) fixed to one side of the second end plate (21), characterized in that: The second ear plates (22) are arranged at intervals, the first ear plate (12) is located between the two second ear plates (22), the first ear plate (12) and the second ear plate (22) are rotationally connected by a rotating shaft (3) to form a rotating node, and two high-strength and high-ductility NPR round steel bars (7) are arranged on each side of the rotating node. The two NPR round steel bars (7) on the same side are arranged vertically opposite to each other to form an annular steel ring coaxial with the rotating shaft (3). One end of the NPR round steel bar (7) is fixedly connected to the first ear plate (12), and the other end of the NPR round steel bar (7) is fixedly connected to the second ear plate (22).

2. The constant-resistance energy-absorbing joint for an engineering structure according to claim 1, characterized in that: One turntable (4) is arranged on each side of the double-ear plate node plate (2). The two ends of the rotating shaft (3) extend out of the second ear plate (22), the turntable (4) is coaxially fixed on the extended end of the rotating shaft (3), a groove is arranged on the edge of the turntable (4), and the inner ring side of the NPR round steel bar (7) is embedded in the groove.

3. The constant-resistance energy-absorbing joint for an engineering structure according to claim 1, characterized in that: The NPR round steel bar (7) is connected to the single-ear plate node plate (1) through a long connecting block (5), and the NPR round steel bar (7) is connected to the double-ear plate node plate (2) through a short connecting block (6). The long connecting block (5) is fixed on the first ear plate (12), and the short connecting block (6) is fixed on the second ear plate (22). The two ends of the NPR round steel bar located above are respectively fixed above the long connecting block (5) and above the short connecting block (6), and the two ends of the NPR round steel bar (7) located below are respectively fixed below the long connecting block (5) and below the short connecting block (6).

4. The constant-resistance energy-absorbing joint for an engineering structure according to claim 3, wherein: The minimum distance between the long connecting block (5) and the double-ear plate node plate (2) is not less than 5 mm.

5. The constant-resistance energy-absorbing joint for an engineering structure according to claim 3, characterized in that: The distance from the installation position of the long connecting block (5) to the axis of the rotating shaft (3) is equal to the distance from the installation position of the short connecting block (6) to the axis of the rotating shaft (3).

6. The constant-resistance energy-absorbing joint for an engineering structure according to claim 1, wherein: The single-ear plate node plate (1) and the double-ear plate node plate (2) are respectively connected to the engineering structure through a first end plate (11) and a second end plate (21).

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