Modularized steel-concrete combined assembly type node structure

Abstract

The utility model relates to a modularized steel-concrete combined assembly type joint structure which comprises a concrete column, a steel beam, a mounting base, a middle beam, a first energy dissipation mechanism and a second energy dissipation mechanism. The first energy dissipation mechanism comprises an energy dissipation plate and a shear pin, and the middle beam is fixedly connected with the mounting base through the energy dissipation plate; the middle beam and the mounting seat are fixedly connected through the shear pin, so that the middle beam and the mounting seat are rigidly connected; the second energy dissipation mechanism comprises a cover plate, a side rib plate and an energy dissipation bolt, and the cover plate and the side rib plate are each provided with a horizontal oblong hole; the cover plate and the side rib plates are fixedly connected with the steel beam and connected with an upper edge plate or a lower edge plate of the steel beam through the long round holes and the energy dissipation bolts. The two energy dissipation mechanisms are used in a combined mode, the middle beam and the installation base form rigid connection and do not exert the anti-seismic performance in normal, if the second energy dissipation mechanism loses efficacy or vibration exceeds the anti-seismic capacity of the second energy dissipation mechanism, the shear pin breaks firstly, the first energy dissipation mechanism is started, and the redundancy of the anti-seismic capacity of the assembly joint can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of assembled mixed frame structures, in particular to a modular steel-concrete combined assembled node structure. Background Art

[0002] For prefabricated concrete frame structures, nodes and connections are often the weakest links in the entire structural system. Since node connections play an important role in transmitting and distributing internal forces and ensuring the integrity of the structure, their damage may cause the entire frame to lose its bearing capacity and cause the structure to collapse.

[0003] In traditional prefabricated frames, the structure mainly dissipates seismic energy through plastic deformation of components such as energy-absorbing plates and energy-absorbing bolts. However, after experiencing heavy loads such as earthquakes, the plastically deformed energy-absorbing plates will undergo irreversible plastic deformation and cannot automatically return to their original state, increasing maintenance costs and time, and making repair and subsequent use difficult due to earthquake damage and destruction.

[0004] In the prior art, for example, the invention patent with patent number CN103243819B discloses an assembled concrete column-steel beam energy-absorbing node connection device, in which the connection part of the precast concrete column generates relative rotation with the upper flange as the rotation center through the slip of the bolts at the lower flange and the bottom of the web, forming a semi-rigid node. This node is rigid under normal use conditions, but under the action of rare earthquakes, it can rotate according to reliable hysteresis characteristics and use the friction plate attached to the combined steel parts to dissipate the seismic energy through the friction energy absorption mechanism. Once the rare earthquake stops, the node behaves rigidly again.

[0005] However, the sliding effect of the bolts in the above-mentioned prior art is mainly achieved by opening oblong holes on the cover plate and the web. After long-term use, the sliding effect may fail due to factors such as rust and fatigue loss, thereby losing the seismic resistance, making the node an ordinary rigid connection node with poor reliability.

[0006] Based on this, it is necessary to study the modular steel-concrete composite assembled node structure. Utility Model Content

[0007] In view of this, the purpose of the utility model is to provide a modular steel-concrete composite assembled node structure, which can effectively solve the problem that a single existing semi-rigid node is prone to slip failure and poor reliability.

[0008] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0009] A modular steel-concrete composite assembled node structure, comprising a concrete column, a steel beam, a mounting seat, an intermediate beam, a first energy dissipation mechanism and a second energy dissipation mechanism;

[0010] The intermediate beam and the steel beam are both H-shaped beams, and both include a web, an upper edge plate and a lower edge plate;

[0011] The mounting seat is fixed on the side wall of the concrete column, and a shear plate is vertically fixed in the middle of the mounting seat;

[0012] The first energy dissipation mechanism comprises an energy dissipation plate and a shear pin, and the energy dissipation plate is an L-shaped plate;

[0013] The upper edge plate and the lower edge plate of the middle beam are fixedly connected to the mounting seat through the energy-absorbing plate; the web plate and the shear plate of the middle beam are provided with corresponding circular holes;

[0014] At least two groups of shear pins are provided, and the shear pins are connected to the web and the shear plate of the middle beam by vertically penetrating circular holes, so that the middle beam and the mounting seat form a rigid connection;

[0015] The second energy dissipation mechanism comprises a cover plate, a side rib plate and energy dissipation bolts, and the cover plate and the side rib plate are both provided with horizontal oblong holes;

[0016] One side of the cover plate is rigidly fixedly connected to the upper edge plate or the lower edge plate of the steel beam, and the other side is connected to the upper edge plate or the lower edge plate of the steel beam through oblong holes and energy-absorbing bolts;

[0017] One side of the side rib is fixedly connected to the web of the middle beam, and the other side is connected to the web of the steel beam through an oblong hole and energy-absorbing bolts;

[0018] There are shock-absorbing gaps between the middle beam and the mounting seat, and between the middle beam and the steel beam.

[0019] Furthermore, the side ribs are U-shaped, and energy-absorbing bolts are passed through oblong holes to connect the cover plate, the side ribs and the upper edge plate or the lower edge plate of the steel beam.

[0020] Furthermore, side ribs are provided on both the left and right sides of the steel beam, and cover plates are provided on both the upper and lower sides of the steel beam. The side ribs and the two cover plates are connected and enclosed to form an integrated sleeve structure.

[0021] Furthermore, friction plates are provided between the side ribs and the steel beams, and between the cover plates and the steel beams.

[0022] Furthermore, a horizontally oriented oblong hole is provided on the shear plate, and the shear plate is fixedly connected to the web of the middle beam via energy-absorbing bolts.

[0023] Furthermore, an annular groove is provided in the middle of the shear pin.

[0024] The beneficial effects of the above technical solution are:

[0025] (1) The utility model combines the advantages and limitations of the two mechanisms of energy dissipation plate deformation energy dissipation and friction seat friction seismic resistance, and adopts a dual-mode energy dissipation structure. The first energy dissipation mechanism mainly uses the energy dissipation plate to form a plastic hinge connection between the mounting seat and the middle beam, and the energy dissipation plate, energy dissipation bolts and other components are plastically deformed to dissipate vibration energy. Under normal circumstances, the shear pin is connected to the web and shear plate of the middle beam by vertically penetrating circular holes, so that the middle beam and the mounting seat form a rigid connection and do not exert seismic resistance. The second energy dissipation mechanism mainly uses oblong holes and energy dissipation bolts to establish a connection between the steel beam and the middle beam. The oblong holes make the energy dissipation bolts Slip is generated, and a reliable hysteresis rotation is formed through the slip action, and the seismic energy is dissipated through friction. When a strong earthquake occurs, if the second energy dissipation mechanism loses its seismic resistance due to slip due to factors such as corrosion and fatigue loss, or the vibration exceeds its seismic resistance, the vibration energy will be transmitted to the shear pin and exert shear force. The shear pin is a vulnerable point. When the vibration energy exceeds the threshold that the shear pin can withstand, the shear pin breaks first and the first energy dissipation mechanism is activated, thereby reducing damage to the main structure. The dual-mode design can improve the redundancy of the seismic resistance of the assembly node and improve the seismic resistance.

[0026] (2) The second energy dissipation mechanism of the utility model responds first under vibration. As a daily energy dissipation and earthquake prevention measure, the second energy dissipation mechanism is rigid under normal circumstances, which can ensure the stability and safety of the structure in daily use, and does not need to be frequently reset and maintained after experiencing slight vibrations; while the first energy dissipation mechanism is activated under specific circumstances, using the reliability of the energy dissipation effect of the energy dissipation plate to improve the redundancy of the earthquake-resistant structure. Compared with the second energy dissipation mechanism, it has a stronger deformation ability and can better adapt to strong earthquake conditions. It is only triggered under special circumstances, which can reduce the number of times the energy dissipation plate is reset after plastic deformation, thereby reducing repair work; the two energy dissipation mechanisms complement each other and can provide effective structural protection under various conditions. They are particularly suitable for high-risk areas that need to cope with various types of earthquake forces. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a three-dimensional schematic diagram of the utility model;

[0028] Figure 2 for Figure 1 A front view of

[0029] Figure 3 for Figure 2 A top view of

[0030] Figure 4 Another embodiment of the cover plate and the side rib plate;

[0031] Figure 5 Parts drawing of the shear pin.

[0032] Figure numerals: 1 is a concrete column, 2 is a steel beam, 3 is a mounting seat, 4 is an intermediate beam, 5 is an energy-absorbing plate, 6 is a shear pin, 7 is a cover plate, 8 is a side rib plate, 9 is an energy-absorbing bolt, 10 is an oblong hole, 11 is a friction plate, 301 is a shear plate, and 601 is an annular groove. DETAILED DESCRIPTION

[0033] The utility model is further described in detail below with reference to the accompanying drawings and specific implementation methods:

[0034] The present embodiment aims to provide a modular steel-concrete composite prefabricated node structure, which is mainly used for the prefabricated connection of concrete columns and steel beams, and aims to solve the problem that the single existing semi-rigid node is prone to slip failure and poor reliability.

[0035] Modular steel-concrete composite assembled node structure, such as Figure 1 , Figure 2 and Figure 3 , including a concrete column 1, a steel beam 2, a mounting seat 3, an intermediate beam 4, a first energy dissipation mechanism and a second energy dissipation mechanism; the intermediate beam 4 and the steel beam 2 are both H-shaped beams, and both include a web, an upper edge plate and a lower edge plate, and the intermediate beam 4 and the steel beam 2 are structures of the same specifications; the mounting seat 3 is fixed to the side wall of the concrete column 1 by anchoring or pre-embedded means, and a shear plate 301 is vertically fixed to the middle of the mounting seat 3. The shear plate 301 can be fixedly connected by welding, and can also be designed as an L-shaped plate or a T-shaped plate to be detachably connected to the mounting seat 3 by bolts for easy replacement.

[0036] The first energy dissipation mechanism includes an energy dissipation plate 5 and a shear pin 6. The energy dissipation plate 5 is an L-shaped plate. The energy dissipation plate 5 is a plate-like element designed to dissipate energy through plastic deformation in a structural system. When a certain load is reached, it can yield or deform, and dissipate energy through such deformation to protect the main structure from damage caused by major dynamic loads (such as earthquakes or wind loads). It is widely used in the field of earthquake resistance and will not be described in detail here. The upper edge plate and the lower edge plate of the middle beam 4 are fixedly connected to the mounting seat 3 through the energy dissipation plate 5.

[0037] The web and shear plate 301 of the middle beam 4 are provided with corresponding circular holes; at least two groups of shear pins 6 are provided, and the shear pins 6 are connected to the web and shear plate 301 of the middle beam 4 by vertically penetrating the circular holes, so that the middle beam 4 and the mounting seat 3 form a rigid connection; the shear pins 6 are a kind of connector designed to break when a specific load is reached, and are widely used in safety, protection and earthquake-resistant design to ensure that the main structure or mechanism can be protected from damage under the action of loads exceeding the design threshold. The shear pins 6 can be sheared at a preset torque value. This feature allows them to be used as sacrificial components to protect the entire structure when overloaded. The shear pins 6 are usually made of high-hardness materials such as hardened steel to ensure performance and reliability under normal loads, so that the middle beam 4 and the mounting seat 3 form a rigid connection; but the shear pins 6 show brittle fracture when they break. This fracture occurs when the material has almost no obvious deformation or plastic deformation, and the fracture process is very rapid, so that the shear bolts can be disconnected first relative to other connectors when a specific load is reached, immediately interrupting the rigid connection between the mounting seat 3 and the middle beam 4, and triggering the first energy dissipation mechanism. Figure 5 An annular groove 601 is provided in the middle of the shear pin 6 to form a vulnerable area, thereby ensuring that the shear pin 6 breaks first.

[0038] The second energy dissipation mechanism includes a cover plate 7, a side rib plate 8 and an energy dissipation bolt 9. The energy dissipation bolt 9 can undergo plastic deformation under a predetermined force. This deformation can absorb a large amount of energy without causing the bolt to break. At the same time, it can dissipate kinetic energy by generating sliding friction between the connected parts. Due to the ductility of the energy dissipation bolt 9, it is usually a ductile fracture when it breaks. Ductile fracture means that the material will experience significant plastic deformation before breaking. This property allows the energy dissipation bolt 9 to dissipate energy while accumulating a large amount of deformation, thereby increasing the safety and stability of the structure under extreme loads. The energy dissipation bolt 9 is widely used in the field of earthquake resistance and will not be elaborated here.

[0039] Both the cover plate 7 and the side rib plate 8 are provided with horizontally oriented oblong holes 10; one side of the cover plate 7 is rigidly fixedly connected to the upper edge plate or the lower edge plate of the steel beam 2, and the other side is connected to the upper edge plate or the lower edge plate of the steel beam 2 through the oblong hole 10 and the energy-absorbing bolt 9; one side of the side rib plate 8 is fixedly connected to the web of the middle beam 4, and the other side is connected to the web of the steel beam 2 through the oblong hole 10 and the energy-absorbing bolt 9; the oblong hole 10 allows the energy-absorbing bolt 9 to slip under strong earthquakes, and forms a reliable hysteresis characteristic rotation through the sliding action, thereby dissipating vibration energy through friction.

[0040] There are shock-absorbing gaps between the middle beam 4 and the mounting seat 3 and between the middle beam 4 and the steel beam 2, which provide deformation space for the first energy dissipation mechanism and the second energy dissipation mechanism.

[0041] Furthermore, the side rib plate 8 is U-shaped, including a belly and ears, the belly is connected to the middle beam 4 and the steel beam 2, and ears are vertically arranged on both sides of the belly; the energy-absorbing bolts 9 penetrate and connect the cover plate 7, one ear of the side rib plate 8 and the upper edge plate or the lower edge plate of the steel beam 2 through the oblong hole 10, so that the side rib plate 8 is fixedly connected with the upper edge plate and the lower edge plate into a whole, thereby improving the rigidity of the structure. In other embodiments, such as Figure 4 Side ribs 8 are provided on the left and right sides of the steel beam 2, and cover plates 7 are provided on the upper and lower sides of the steel beam 2. The ribs 8 on both sides and the two cover plates 7 are connected and enclosed to form an integrated sleeve structure, thereby further improving the structural rigidity, simplifying the on-site installation steps, and improving the construction efficiency.

[0042] Furthermore, friction plates 11 are provided between the side ribs 8 and the steel beams 2 and between the cover plates 7 and the steel beams 2 to increase the efficiency of frictionally dissipating seismic energy.

[0043] Furthermore, a horizontally oriented oblong hole 10 is also provided on the shear plate 301, and is fixedly connected to the web of the middle beam 4 through energy-absorbing bolts 9. The shear plate 301 is connected to the middle beam 4 through the oblong hole 10 and the energy-absorbing bolts 9. When the first energy-absorbing mechanism is triggered, slippage is formed between the shear plate 301 and the web of the middle beam 4, which manifests as plastic hinge. Due to the ductility and ductile fracture characteristics of the energy-absorbing bolts 9, the shear pin 6's first-cutting function and the action of the energy-absorbing plate 5 are not affected. However, under normal conditions, the reliability of the structure can be enhanced and the risk of accidental failure can be reduced.

Claims

1. Modular steel-concrete composite assembled node structure, characterized by: It comprises a concrete column (1), a steel beam (2), a mounting seat (3), an intermediate beam (4), a first energy dissipation mechanism and a second energy dissipation mechanism; The intermediate beam (4) and the steel beam (2) are both H-shaped beams, and both include a web plate, an upper edge plate and a lower edge plate; The mounting seat (3) is fixed on the side wall of the concrete column (1), and a shear plate (301) is vertically fixed in the middle of the mounting seat (3); The first energy dissipation mechanism comprises an energy dissipation plate (5) and a shear pin (6), and the energy dissipation plate (5) is an L-shaped plate; The upper edge plate and the lower edge plate of the middle beam (4) are fixedly connected to the mounting seat (3) via the energy-absorbing plate (5); the web plate and the shear plate (301) of the middle beam (4) are both provided with corresponding circular holes; At least two groups of shear pins (6) are provided, and the shear pins (6) are connected to the web and the shear plate (301) of the middle beam (4) by vertically penetrating circular holes, so that the middle beam (4) and the mounting seat (3) form a rigid connection; The second energy dissipation mechanism comprises a cover plate (7), a side rib plate (8) and an energy dissipation bolt (9), and the cover plate (7) and the side rib plate (8) are both provided with a horizontal oblong hole (10); One side of the cover plate (7) is rigidly fixedly connected to the upper edge plate or the lower edge plate of the steel beam (2), and the other side is connected to the upper edge plate or the lower edge plate of the steel beam (2) via an oblong hole (10) and an energy-absorbing bolt (9); One side of the side rib plate (8) is fixedly connected to the web of the middle beam (4), and the other side is connected to the web of the steel beam (2) via an oblong hole (10) and an energy-absorbing bolt (9); There are shock-absorbing gaps between the middle beam (4) and the mounting seat (3), and between the middle beam (4) and the steel beam (2).

2. The modular steel-concrete composite assembled node structure according to claim 1 is characterized in that: The side rib plate (8) is U-shaped, and the energy-absorbing bolts (9) are inserted through the oblong holes (10) to connect the cover plate (7), the side rib plate (8) and the upper edge plate or the lower edge plate of the steel beam (2).

3. The modular steel-concrete composite assembled node structure according to claim 2 is characterized in that: The left and right sides of the steel beam (2) are both provided with side ribs (8), and the upper and lower sides of the steel beam (2) are both provided with cover plates (7), and the side ribs (8) and the two cover plates (7) are connected and enclosed to form an integrated sleeve structure.

4. The modular steel-concrete composite assembled node structure according to any one of claims 1 to 3, characterized in that: Friction plates (11) are provided between the side ribs (8) and the steel beam (2), and between the cover plate (7) and the steel beam (2).

5. The modular steel-concrete composite assembled node structure according to claim 4 is characterized in that: The shear plate (301) is provided with a horizontally oriented oblong hole (10) and is fixedly connected to the web of the middle beam (4) via energy-absorbing bolts (9).

6. The modular steel-concrete composite assembled node structure according to claim 4 is characterized in that: An annular groove (601) is provided in the middle of the shear pin (6).

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