A steel structure reinforcement node component with multiple anti-seismic and anti-progressive collapse defense lines

Abstract

The present invention discloses a steel structure reinforcement node component with multiple anti-seismic and anti-continuous collapse defense lines, comprising a steel beam, a steel column, a steel groove and a truss chord; the end of the steel beam is fixed on the steel column, the steel groove is fixed on the lower surface of the lower flange of the steel beam, a hinge support is arranged on the side of the steel column, a friction slider is arranged in the steel groove, a through hole is arranged on the bottom surface of the steel groove, one end of the truss chord passes through the through hole and is connected with the friction slider, and the other end of the truss chord is connected with the hinge support. The component can effectively solve the problem of brittle failure of the structure caused by insufficient anti-seismic and progressive collapse capacity of traditional steel structure nodes.

Description

Technical Field

[0001] The invention belongs to the field of steel structures and relates to a steel structure reinforcement node component with multiple anti-seismic and anti-continuous collapse defense lines. Background Art

[0002] Steel structure engineering is widely used in the construction industry due to its advantages such as light weight, high strength, good plasticity and toughness, and high degree of mechanization in manufacturing and installation. As the probability of building structures being subjected to accidental loads (such as earthquakes, fires, explosions, impacts, etc.) during use continues to increase, the probability of structural components being damaged or failing also increases significantly, which may cause local damage to the structure or even disproportionate continuous collapse damage. After a component of the structure fails, the internal force will be redistributed inside the structure. Therefore, the node has sufficient strength to ensure that the important area of ​​the beam-column connection node is not damaged. This is the guarantee for the internal force redistribution of the structure, the premise for the structure to enter the catenary stage, and the key to the structure not collapsing continuously. Continuous collapse is a strong nonlinear dynamic failure. The collapse of the structure is usually short-lived and mostly brittle failure. At the same time, the seismic design code for building structures requires that the node has sufficient ductility to meet the deformation requirements of the structure under earthquake action so that brittle failure does not occur. Therefore, a reinforcement method to reduce structural brittle failure is urgently needed in new and existing buildings, so as to improve the structure's ability to resist progressive collapse without reducing or even improving the structure's seismic resistance. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a steel structure reinforcement node component with multiple anti-seismic and progressive collapse defense lines, which can effectively solve the problem of brittle failure of the structure caused by insufficient anti-seismic and progressive collapse capacity of traditional steel structure nodes. To achieve the above-mentioned purpose, the steel structure reinforcement node component with multiple anti-seismic and progressive collapse defense lines of the present invention includes steel beams, steel columns, steel channels and truss chords;

[0004] The end of the steel beam is fixed on the steel column, the steel trough is fixed on the lower surface of the lower flange of the steel beam, a hinge support is arranged on the side of the steel column, a friction slider is arranged in the steel trough, a through hole is arranged on the bottom surface of the steel trough, one end of the truss chord passes through the through hole and is connected to the friction slider, and the other end of the truss chord is connected to the hinge support.

[0005] The web of the steel beam is connected to the side of the steel column through bolts and web angle steel.

[0006] A connecting plate is fixed on the side of the steel column, and a hinge support is fixed on the connecting plate.

[0007] The number of hinged supports, the number of truss chords and the number of friction sliders are equal, wherein one truss chord corresponds to one hinged support and one friction slider.

[0008] The angle between the truss chord and the side of the steel column is 30°-60°.

[0009] The interior of the steel trough is divided into several cavities by a partition plate. The number of through holes on the bottom surface of the steel trough is the same as the number of cavities, and one cavity corresponds to one through hole, one friction slider and one truss chord. Each through hole is opened at the bottom of the corresponding cavity, and each friction slider is located in the corresponding cavity.

[0010] The steel column is an H-shaped steel, wherein a column stiffening plate is arranged between an upper flange and a lower flange of the steel column.

[0011] The axis of the steel channel is in the same plane as the web of the steel beam;

[0012] The center axis of the hinged support is in the same plane as the web of the steel column.

[0013] The truss chord and the hinge support are connected by pins;

[0014] The connecting plate and the steel column are connected by high-strength bolts.

[0015] There are four column stiffening plates, of which two are respectively facing the upper flange and the lower flange of the steel beam, and the other two are facing the connecting plate.

[0016] The present invention has the following beneficial effects:

[0017] During specific operation, the steel structure reinforcement node component with multiple anti-seismic and anti-continuous collapse defense lines described in the present invention is provided with a truss chord between the bottom of the steel beam and the steel column. Under normal use load, the reinforcement node component does not participate in the work. When the angle between the steel beam and the steel column changes, the truss chord can rotate freely, and the friction slider placed in the steel groove also rotates or slides, which has no obvious effect on the rotational stiffness and bearing capacity of the node during the use stage. As the steel beam and steel column nodes rotate, the truss chord rotates around the hinge support, and the friction slider slides with the inner side of the steel groove, and the friction force changes with the rotation angle of the node; under the action of an earthquake, the rotation of the beam-column node drives the friction slider to slide in the friction cavity of the steel groove, and there is friction between the friction slider and the inner wall of the steel groove. The friction force can increase the structural damping and improve the seismic resistance of the structure. During the collapse of the structure, the upper node of the steel column is subjected to positive bending moment (or negative bending moment). The truss chord is in a tensile (or compressive) state under the constraint of the steel groove and rotates toward (or away from) the side of the steel column. The top surface of the steel groove, the partition plate, the friction slider, the truss chord and the connecting plate can share a certain bending moment, thereby improving the bending bearing capacity of the node and the seismic resistance and progressive collapse resistance of the structure. Under the action of accidental loads, all components at the beam-column node are in a stress state, and the truss chord buckles and fails before the node, releasing part of the energy input into the structure by the external load, so as to solve the problem of brittle failure of the structure caused by insufficient seismic resistance and progressive collapse resistance of traditional steel structure nodes. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the present invention;

[0019] Figure 2 It is a front view of the present invention;

[0020] Figure 3 for Figure 2 Cross-section in the AA direction;

[0021] Figure 4 is a schematic diagram of a truss chord 7;

[0022] Figure 5 is a schematic diagram of a steel tank 6;

[0023] Figure 6 It is a schematic diagram of the connection between the friction slider 10 and the truss chord 7;

[0024] Figure 7 It is a schematic diagram of the hinge support 8 and the connecting plate 9 being connected;

[0025] Figure 8 A top view of the hinge support 8 connected to the connecting plate 9;

[0026] Fig. 9 It is a left view of the hinge support 8 connected to the connecting plate 9;

[0027] Fig.10 It is a detailed enlarged view of the steel channel 6;

[0028] Fig.11 It is a detailed enlarged view of the hinge support 8;

[0029] Fig.12 is a schematic diagram of the position of the bolt 4;

[0030] Fig.13 for Fig.12 A detailed enlarged view of the middle hinge support 8.

[0031] Among them, 1 is a steel column, 2 is a steel beam, 3 is a column stiffener, 4 is a bolt, 5 is a web angle steel, 6 is a steel channel, 7 is a truss chord, 8 is a hinge support, 9 is a connecting plate, and 10 is a friction slider. DETAILED DESCRIPTION

[0032] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0033] refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 The steel structure reinforcement node component with multiple earthquake-resistant and progressive collapse-resistant defense lines described in the present invention includes a steel beam 2, a steel column 1, a steel groove 6 and a truss chord 7; the end of the steel beam 2 is fixed on the steel column 1, the steel groove 6 is fixed on the lower surface of the lower flange of the steel beam 2, a hinge support 8 is arranged on the side of the steel column 1, a friction slider 10 is arranged in the steel groove 6, and a through hole is arranged on the bottom surface of the steel groove 6, one end of the truss chord 7 passes through the through hole and is connected to the friction slider 10, and the other end of the truss chord 7 is connected to the hinge support 8.

[0034] refer to Figure 5 , Fig.11 , Fig.12 and Fig.13 Specifically, the web of the steel beam 2 is connected to the side of the steel column 1 by bolts 4 and web angle steels 5; a connecting plate 9 is fixed to the side of the steel column 1, and a hinge support 8 is fixed on the connecting plate 9; the truss chord 7 and the hinge support 8 are connected by pins; the connecting plate 9 and the steel column 1 are connected by high-strength bolts.

[0035] refer to Figure 5, the number of hinge supports 8, the number of truss chords 7 and the number of friction sliders 10 are equal, wherein one truss chord 7 corresponds to one hinge support 8 and one friction slider 10; the interior of the steel trough 6 is divided into a plurality of cavities by a partition plate, the number of through holes on the bottom surface of the steel trough 6 is the same as the number of cavities, and one cavity corresponds to one through hole, one friction slider 10 and one truss chord 7, each through hole is opened at the bottom of the corresponding cavity, and each friction slider 10 is located in the corresponding cavity.

[0036] The steel column 1 is an H-shaped steel, wherein a column stiffening plate 3 is arranged between the upper flange and the lower flange of the steel column 1. There are four column stiffening plates 3, wherein two column stiffening plates 3 are respectively opposite to the upper flange and the lower flange of the steel beam 2, and the other two column stiffening plates 3 are opposite to the connecting plate 9.

[0037] The angle θ between the truss chord 7 and the flange of the steel column 1 is 30-60°, which has good rotation ability and avoids bending of the truss chord 7 during normal use.

[0038] The center line of the steel channel 6 and the web of the steel beam 2 are in the same plane, so as to prevent the lower flange of the steel beam 2 from being subjected to additional force from the steel channel 6 during the rotation of the node.

[0039] The central axis of the hinge support 8 is in the same plane as the web of the steel column 1. Two column stiffening plates 3 are welded between the flanges of the steel column 1. The two column stiffening plates 3 are flush with the upper and lower ends of the connecting plate 9, respectively, to avoid serious damage to the flanges of the steel column 1 by the reinforced node components during the force process, thereby preventing the steel column 1 from buckling.

[0040] Bolt holes are provided on the connecting plate 9 , and the number of bolt holes is at least one row on the left and right sides of the hinge support 8 , with at least 2 in each row. The number and arrangement of the bolt holes provided on the steel column 1 correspond to the bolt holes on the connecting plate 9 .

[0041] The steel column 1, steel beam 2, column stiffener 3, web angle 5, steel channel 6, truss chord 7, hinge support 8, connecting plate 9 and friction slider 10 are all made of Q235 steel, Q345 steel, Q390 steel or Q420 steel, and the bolt 4 is a 8.8 or 10.9 grade high-strength bolt to ensure the strength of the node.

[0042] The construction process of the present invention is:

[0043] In the factory, the truss chord 7 is first adjusted to the required length, the friction slider 10 is welded to the upper end of the truss chord 7, and then the steel channel 6 is made. First, a steel plate of the required size is taken and a through hole is opened on it. Then the truss chord 7 is passed through the through hole on the bottom surface of the steel channel 6, and the friction slider 10 is placed on the steel plate. Finally, the remaining five surfaces and the partition plate of the steel channel 6 are welded, so that the friction slider 10 is placed in the steel channel 6; the manufactured hinge support 8 is welded to the connecting plate 9, and finally the bottom end of the truss chord 7 is connected to the hinge support 8 by a pin.

[0044] The reinforcement node components are manufactured in the factory. For newly built buildings, the connection plate 9 and the steel column 1 are connected by bolts 4, and bolt holes need to be reserved on the connection plate 9 and the flange of the steel column 1.

[0045] The on-site construction operation steps are: use bolts 4 and web angle steel 5 to fix the steel column 1 and the steel beam 2, use welding to connect the steel channel 6 and the flange of the steel beam 2, and then connect the connecting plate 9 and the flange of the steel column 1 by welding or bolting. For the reinforcement of existing buildings, the welding connection is the same as that of new buildings. When using bolts 4 to connect, the flange of the steel column 1 needs to be drilled on site.

[0046] It should be noted that the present invention designs the arrangement angle θ of the truss chord 7 according to the steel beam 2, the steel column 1 and the connection node form, so that the three truss chords 7 from near to far away from the steel column 1 are successively buckled and damaged before the node is damaged, and the energy is dissipated step by step, so that the steel structure node has multiple anti-seismic and anti-continuous collapse defense lines, thereby reducing the brittle failure of the structure.

Claims

1. A steel structure reinforcement node component with multiple anti-seismic and anti-progressive collapse defense lines, characterized in that: It comprises a steel beam (2), a steel column (1), a steel channel (6) and a truss chord (7); The end of the steel beam (2) is fixed on the steel column (1), the steel channel (6) is fixed on the lower surface of the lower flange of the steel beam (2), a hinge support (8) is arranged on the side of the steel column (1), a friction slider (10) is arranged in the steel channel (6), a through hole is arranged on the bottom surface of the steel channel (6), one end of the truss chord (7) passes through the through hole and is connected to the friction slider (10), and the other end of the truss chord (7) is connected to the hinge support (8); The angle between the truss chord (7) and the side surface of the steel column (1) is 30°-60°; The interior of the steel trough (6) is divided into a plurality of cavities by a partition plate. The number of through holes on the bottom surface of the steel trough (6) is the same as the number of cavities, and one cavity corresponds to one through hole, one friction slider (10) and one truss chord (7). Each through hole is opened at the bottom of the corresponding cavity, and each friction slider (10) is located in the corresponding cavity.

2. The steel structure reinforcement node member with multiple anti-seismic and anti-progressive collapse defense lines according to claim 1 is characterized in that: The web of the steel beam (2) is connected to the side of the steel column (1) via bolts (4) and web angle steels (5).

3. The steel structure reinforcement node member with multiple anti-seismic and anti-progressive collapse defense lines according to claim 1 is characterized in that: A connecting plate (9) is fixed to the side of the steel column (1), and a hinge support (8) is fixed on the connecting plate (9).

4. The steel structure reinforcement node member with multiple anti-seismic and anti-progressive collapse defense lines according to claim 1 is characterized in that: The number of hinged supports (8), the number of truss chords (7) and the number of friction sliders (10) are equal, wherein one truss chord (7) corresponds to one hinged support (8) and one friction slider (10).

5. The steel structure reinforcement node member with multiple anti-seismic and anti-progressive collapse defense lines according to claim 1 is characterized in that: The steel column (1) is an H-shaped steel, wherein a column stiffening plate (3) is arranged between an upper flange and a lower flange of the steel column (1).

6. The steel structure reinforcement node member with multiple anti-seismic and anti-progressive collapse defense lines according to claim 1, characterized in that: The axis of the steel channel (6) and the web of the steel beam (2) are in the same plane; The central axis of the hinge support (8) and the web of the steel column (1) are in the same plane.

7. The steel structure reinforcement node member with multiple anti-seismic and anti-progressive collapse defense lines according to claim 3 is characterized in that: The truss chord (7) and the hinge support (8) are connected via a pin; The connecting plate (9) and the steel column (1) are connected via high-strength bolts.

8. The steel structure reinforcement node member with multiple anti-seismic and anti-progressive collapse defense lines according to claim 6, characterized in that: There are four column stiffening plates (3), of which two column stiffening plates (3) are respectively opposite to the upper flange and the lower flange of the steel beam (2), and the other two column stiffening plates (3) are opposite to the connecting plate (9).

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