A multi-hazard resistant steel frame structure

Abstract

The application discloses a kind of multi-disaster defense steel frame structures, it is related to building technology field;Steel frame structure includes: steel frame structure main body and floor, steel frame structure includes frame beam and frame column;Floor is fixedly installed in the upper position of each layer frame beam of the steel frame structure main body;Floor includes flexible bottom plate, prefabricated laminated board and cast-in-place surface layer, flexible bottom plate includes flat plate and annular riser, flat plate is located in the beam-column joint area, the upper surface of flat plate is provided with annular riser, annular riser is set in frame column edge position;Prefabricated laminated board is reserved with hole in frame column edge position, prefabricated laminated board and flexible bottom plate can be combined into closed bottom plane, cast-in-place surface layer is poured on the upper surface of flexible bottom plate and prefabricated laminated board;Flexible bottom plate is set in the annular riser of column edge position, avoid extrusion and collision of cast-in-place surface layer and frame column in the process of stress.

Description

Technical Field

[0001] This invention relates to the field of building technology, and specifically to a multi-hazard defense steel frame structure. Background Technology

[0002] The traditional "earthquake-resistant" design concept is no longer sufficient to meet the needs of today's society. Developing a recoverable structural system that allows for controllable damage during earthquakes and convenient post-earthquake repair is imperative. After an earthquake, it can effectively prevent the interruption of building functions due to seismic forces, thus avoiding greater losses, especially for critical infrastructure such as medical facilities and communications. While achieving post-earthquake recoverability, building structures must also consider the impact of unexpected loads, ultimately realizing a comprehensive multi-hazard defense function and significantly improving the resilience of building structures.

[0003] The connection construction of frame structures is crucial for multi-hazard defense. Frame structures mainly include beam-column joints, column base joints, and floor slab connections. Beam-column joints need to be functionally recoverable after an earthquake and possess strong deformation and ties under collapse conditions. Column base joints primarily function during earthquakes, requiring a focus on their recoverability design. Floor slabs, as an essential component of the structural system, should ensure ease of prefabricated production and construction while prioritizing their ability to work collaboratively with other components to achieve controllable damage. Finally, these three elements are organically combined with beam and column members to form a multi-hazard defense prefabricated steel frame structure system. Currently, there is a lack of comprehensive consideration of multi-hazard effects in steel frame structure systems, urgently necessitating the development of new steel frame structure systems with multi-hazard defense capabilities. Summary of the Invention

[0004] (I) Technical Problems Solved In view of the shortcomings of the prior art, the present invention provides a multi-hazard defense steel frame structure to solve at least one of the technical problems mentioned in the background art.

[0005] (II) Technical Solution The technical solution adopted in this invention is: a multi-hazard defense steel frame structure, wherein the steel frame structure includes:

[0006] The main body of the steel frame structure includes frame beams and frame columns; the steel frame structure also includes floor slabs, which are fixedly installed on the upper part of the frame beams of each floor of the main body of the steel frame structure.

[0007] The floor slab includes:

[0008] A flexible base plate, comprising a flat plate and an annular vertical plate, wherein the flat plate is located in the beam-column joint area, and the annular vertical plate is provided on the upper surface of the flat plate, and the annular vertical plate is provided at the edge of the frame column;

[0009] The prefabricated composite slab has holes pre-reserved at the edge of the frame column, and the prefabricated composite slab and the flexible base plate can be combined to form a closed bottom plane;

[0010] A cast-in-place surface layer is poured onto the upper surface of the flexible base plate and the precast composite slab.

[0011] Preferably, the precast composite slab is provided with protruding anchoring steel bars, and the precast composite slab is connected to the cast-in-place surface layer and frame beams through the anchoring steel bars.

[0012] Preferably, the main body of the steel frame structure further includes column base nodes, which are located at the connection point between the frame column and the foundation of the main body of the steel frame structure; the column base nodes include:

[0013] A double-hinged base, wherein the upper surface of the double-hinged base is provided with a groove circumferentially near the edge, and the bottom of the frame column is provided with a protrusion circumferentially at the edge, wherein the groove of the double-hinged base and the protrusion at the bottom of the frame column can be inserted and matched.

[0014] A double-hinged base is mounted on the upper surface of the foundation;

[0015] A rigid ring beam, which is circumferentially sleeved and fixed to the outside of the frame column;

[0016] A bidirectional energy dissipation component has a biaxially symmetrical cross section and is distributed at the corner of the frame column; one end of the bidirectional energy dissipation component is fixedly connected to the upper surface of the double-hinged base, and the other end is fixedly connected to the lower surface of the rigid ring beam.

[0017] Preferably, there is a gap between the inner wall of the upper groove of the double-hinged base and the outer wall of the bottom protrusion of the frame column; the groove of the double-hinged base is an arc-shaped structure, and the protrusion at the bottom of the frame column is also an arc-shaped structure.

[0018] Preferably, the rigid ring beam includes a stiffening plate, which is fixed to the outside of the frame column;

[0019] H-beams, which are fixed to the outside of the frame columns and stiffening plates;

[0020] A corner connector is fixed to the outside of the frame column and located at the corner connection of two adjacent H-beams.

[0021] Preferably, the main steel frame structure further includes beam-column joints, which are located at the intersection of the frame beams and frame columns of the main steel frame structure; the beam-column joints include:

[0022] A sliding tie rod, comprising a tie rod, a fixed slide groove, and limiting components; the fixed slide groove is fixedly connected to the upper and lower flanges of the frame beam via a connecting plate extending from the side; the fixed slide groove has a through hole, allowing the tie rod to slide freely within the hole of the fixed slide groove; limiting components are provided at both ends of the tie rod.

[0023] Preferably, the beam-column joint further includes a double-hinged connector, which includes a first side plate and a second side plate, the first side plate and the second side plate being able to rotate in opposite directions; wherein, the first side plate is fixedly connected to the cantilever short steel beam, and the second side plate is fixedly connected to the long steel beam; preferably, the beam-column joint further includes a T-shaped energy-dissipating plate, the T-shaped energy-dissipating plate being disposed at the connection between the short steel beam and the long steel beam, the T-shaped energy-dissipating plate having a weakening section with a T-shaped cross-section in its middle position.

[0024] (III) Beneficial Effects This invention provides a multi-hazard defense steel frame structure, which, compared with the prior art, has the following beneficial effects:

[0025] (a) A flexible base plate is installed near the frame columns on the floor slab. A flat plate on the flexible base plate separates the cast-in-place surface layer from the frame beams, while a ring-shaped vertical plate on the flexible base plate separates the cast-in-place surface layer from the frame columns, avoiding interaction between the main steel frame structure and the floor slab. Therefore, under horizontal seismic loads, the main steel frame structure will act as the main load-bearing component resisting external loads. At this time, the beam-column joints and column base joints will bear significant bending loads. The double-hinged connectors at the beam-column joints and the double-hinged bases at the column base joints allow the stressed connection areas to deform according to a predetermined deformation pattern, which aids in the overall structural stress analysis and recoverable functional design. Combined with T-shaped energy-dissipating plates with weakened cross-sections and bidirectional energy-dissipating components, plastic damage deformation can be concentrated and confined to the weakened area, protecting other components from earthquake damage. After an earthquake, only the T-shaped energy-dissipating plates and bidirectional energy-dissipating components need to be replaced to quickly restore the structural mechanical properties, avoiding prolonged interruption of building function due to earthquakes and preventing greater personal and property losses.

[0026] (b) In addition to the more common seismic loads, the problem of progressive collapse under unexpected loads must also be considered. Unexpected loads include impact, explosion, fire, design and construction defects, etc. The occurrence of such disasters typically involves the bottom frame columns being damaged first by unexpected loads, followed by the upper frame beams failing to provide sufficient ties to prevent the damage from spreading, ultimately leading to partial or complete structural collapse. Under these conditions, the collapse resistance of the beam-column joint is crucial. The sliding tie rod and double-hinged connector in this invention provide strong axial ties and rotational deformation capabilities for the beam-column joint, respectively. The double-hinged connector does not restrict the axial deformation of the joint and can rotate at a large angle, which helps to fully utilize the axial ties of the sliding tie rod and the steel beam. Furthermore, a flexible base plate is installed in the joint area to prevent the floor slab from affecting the stress on the joint, which is beneficial to the collapse resistance design of the beam-column joint. Under small deformation conditions, the sliding tie rod does not participate in the structural stress, and the T-shaped energy dissipation plate will provide bending bearing capacity for the beam-column joint; under large deformation conditions, due to the deformation restriction of the limiting component, the sliding tie rod will provide a strong secondary tie effect for the frame beam, resisting the vertical unbalanced load caused by the failure of the frame column.

[0027] In summary, the multi-hazard defense steel frame structure proposed in this invention has post-earthquake recovery capability and strong anti-collapse capability, that is, it has multi-hazard defense function, which solves the problem that existing frame structures cannot cope with multiple disasters. Attached Figure Description

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the main structure of the steel frame structure according to an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the combination of the steel frame structure and the floor slab in an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the floor slab structure according to an embodiment of the present invention;

[0031] Figure 4 This is an exploded view of the floor slab according to an embodiment of the present invention;

[0032] Figure 5 for Figure 1 Structural diagram of the column base node at point A;

[0033] Figure 6 This is an exploded view of the column base node according to an embodiment of the present invention;

[0034] Figure 7 This is a schematic diagram of the rigid ring beam according to an embodiment of the present invention;

[0035] Figure 8 This is a schematic diagram illustrating the working principle of the double-hinged base according to an embodiment of the present invention.

[0036] Figure 9 for Figure 1 Structural schematic diagram of the beam-column joint at point B;

[0037] Figure 10 This is an exploded view of the beam-column joint according to an embodiment of the present invention;

[0038] The structure includes: 1. Steel frame main body; 2. Flexible base plate; 3. Precast composite slab; 4. Cast-in-place surface layer; 5. Double hinged base; 6. Rigid ring beam; 7. Bidirectional energy dissipation component; 8. Sliding tie rod; 9. Double hinged connector; 10. T-shaped energy dissipation plate.

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0040] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods: as shown in the accompanying drawings. Figures 1-10 As shown, the present invention provides a multi-hazard defense steel frame structure, the steel frame structure comprising:

[0041] like Figures 1-4 The steel frame structure 1 shown includes frame beams and frame columns; the steel frame structure also includes floor slabs, which are fixedly installed on the upper part of the frame beams of each layer of the steel frame structure 1; the floor slab includes a flexible base plate 2, a precast composite slab 3, and a cast-in-place surface layer 4. The flexible base plate 2 includes a flat plate 201 and an annular vertical plate 202. The flat plate 201 is located in the beam-column node area. The annular vertical plate 202 is provided on the upper surface of the flat plate 201 and is located at the edge of the frame column. The precast composite slab 3 has holes reserved at the edge of the frame column. The precast composite slab 3 and the flexible base plate 2 can be combined to form a closed bottom plane. The cast-in-place surface layer 4 is poured on the upper surface of the flexible base plate 2 and the precast composite slab 3. Specifically, the flexible base plate 2 is made of lightweight, low-strength thermal insulation and sound insulation material, which facilitates the rapid replacement of the T-shaped energy dissipation plate (10) on the upper flange of the frame beam after an earthquake, and ensures the thermal insulation and sound insulation function of the floor slab; the flexible base plate 2 is located at the edge of the frame column and below the cast-in-place surface layer 4, blocking the connection between the cast-in-place surface layer 4 and the frame beam; the flexible base plate 2 has an annular vertical plate 202 set near the edge of the column to prevent the cast-in-place surface layer 4 from being squeezed and collided with the frame column during the stress process; the precast composite slab 3 is placed on the frame beam in the area without the flexible base plate 2, that is, away from the node area, and below the cast-in-place surface layer 4.

[0042] In one embodiment, the precast composite slab 3 is provided with protruding anchoring steel bars, and the precast composite slab 3 is connected to the upper cast-in-place surface layer 4 and the frame beam through the anchoring steel bars; the flexible bottom slab 2 and the precast composite slab 3 are combined to form a closed bottom plane, which serves as a template for the upper cast-in-place surface layer 4 and also as part of the final formed floor slab; the cast-in-place surface layer 4 is provided with a steel reinforcement skeleton and is formed by on-site one-time concrete pouring.

[0043] One embodiment, such as Figures 5-8 As shown, the main body 1 of the steel frame structure also includes column base nodes, which are located at the connection between the frame column and the foundation of the main body 1 of the steel frame structure. The column base node includes: a double-hinged base 5, a rigid ring beam 6, and a bidirectional energy dissipation component 7. The upper surface of the double-hinged base 5 has a groove circumferentially provided near the edge, and the bottom of the frame column has a protrusion circumferentially provided at the edge. The groove of the double-hinged base 5 and the protrusion at the bottom of the frame column can be inserted and matched. The double-hinged base 5 is set on the upper surface of the foundation, and the protrusion at the bottom of the frame column matches the groove on the double-hinged base 5, which can realize the bidirectional swaying deformation of the frame column. On the one hand, it can alleviate the stress concentration at the bottom of the column, and on the other hand, it can effectively constrain the lateral displacement of the bottom of the column. The rigid ring beam 6 is circumferentially sleeved and fixed outside the frame column; the bidirectional energy dissipation component 7 has a biaxially symmetrical cross section and is distributed at the corner of the frame column; one end of the bidirectional energy dissipation component 7 is fixedly connected to the upper surface of the double-hinged base 5, and the other end is fixedly connected to the lower surface of the rigid ring beam 6. The bidirectional energy dissipation component 7 has a biaxially symmetrical cross-section and is distributed at the corners of the column to fully utilize the seismic performance of the frame column in both principal axis directions. A weakening section is provided in the middle of the bidirectional energy dissipation component 7 to achieve plastic damage concentration and functional recovery. Both ends can be connected to the double-hinged base 5 and the rigid ring beam 6 using axially stressed high-strength bolts. The rigid ring beam 6 is welded to the frame column, facilitating the bolt connection between the bidirectional energy dissipation component 7 and the frame column. The double-hinged base 5 mainly restricts the lateral deformation of the frame column and reduces stress concentration at the contact points during the frame column's swaying deformation. Under horizontal loads, the frame column will rotate around the edge protrusion on one side of the bottom. At this time, the bidirectional energy dissipation component 7 mainly bears axial tensile and compressive loads to resist the bottom bending load caused by the top horizontal load; while the corresponding groove on the double-hinged base 5 bears the bottom horizontal shear force caused by the top horizontal load.

[0044] In one embodiment, there is a gap between the inner wall of the upper groove of the double hinged bottom 5 and the outer wall of the bottom protrusion of the frame column.

[0045] In one embodiment, the groove of the double-hinged base 5 is an arc-shaped structure, and the protrusion at the bottom of the frame column is an arc-shaped structure.

[0046] In the implementation of the above embodiments, the gap between the inner wall of the groove at the top of the double hinge bottom 5 and the outer wall of the protrusion at the bottom of the frame column is provided to allow space for the rotation of the bottom of the frame column, thereby reducing the influence of friction; the smoothness of rotation can be achieved through the design of the arc surface.

[0047] In one embodiment, the rigid ring beam 6 includes a stiffening plate 601, an H-beam 602, and a corner connector 603. The stiffening plate 601 is fixed to the outside of the frame column. The H-beam 602 is fixed around the frame column and to the outside of the frame column and the stiffening plate 601. The corner connector 603 is fixed to the outside of the frame column and located at the corner between two H-beams 602. The rigid ring beam 6 adopts a lattice structure, consisting of the stiffening plate 601, the H-beam 602, and the corner connector 603 sequentially welded to the frame column to form a rigid ring beam 6 with high rigidity, providing a high-rigidity fixing point for the bidirectional energy dissipation component 7.

[0048] One embodiment, such as Figure 9 and 10 As shown, the main body of the steel frame structure 1 also includes beam-column nodes, which are located at the junction of the frame beams and frame columns of the main body of the steel frame structure 1. Each beam-column node includes a sliding tie rod 8, which comprises a tie rod 801, a fixed slide groove 802, and a limiting member 803. The fixed slide groove 802 is fixedly connected to the upper and lower flanges of the frame beam via a connecting plate extending from its side. The fixed slide groove 802 has a through hole, allowing the tie rod 801 to slide freely within the hole. Limiting members 803 are provided at both ends of the tie rod 801. When the limiting member 803 slides to contact the fixed slide groove 802, the tie rod 801 begins to bear tensile force, providing a strong axial tensile strength for the frame beam.

[0049] The beam-column joint also includes a double-hinged connector 9, which includes a first side plate 901 and a second side plate 902. The first side plate 901 and the second side plate 902 are rotatable in opposite directions. The first side plate 901 is fixedly connected to the cantilever short steel beam, and the second side plate 902 is fixedly connected to the long steel beam. The beam-column joint also includes a T-shaped energy-dissipating plate 10, which is disposed at the connection between the short steel beam and the long steel beam. The T-shaped energy-dissipating plate 10 has a weakening section with a T-shaped cross-section in its middle position.

[0050] The above embodiment consists of a double-hinged connector 9, a T-shaped energy-dissipating plate 10, and a sliding tie rod 8. Compared to a single-hinged node, the double-hinged connector 9 reduces the compressive deformation of the energy-dissipating plate, thereby preventing premature instability. Furthermore, the double-hinged connector 9 only bears vertical shear force; the node bending moment and axial force are borne by the replaceable energy-dissipating plate, which facilitates post-earthquake functional recovery of the node and a secondary tethering mechanism under unexpected loads. The T-shaped energy-dissipating plate 10 has a simple structure and a small slenderness ratio, providing stable energy dissipation capacity under repeated tensile and compressive loads. A weakening section is provided in the middle of the energy-dissipating plate to concentrate plastic damage and ensure functional recovery. The sliding tie rod 8 is an additional secondary tensioning component, consisting of a tie rod 801 and a fixed groove 802. Under small deformation conditions such as seismic loads, the tie rod 801 can slide freely in the fixed groove 802 without affecting the node's stress. In the event of a collapse, when the T-shaped energy dissipation plate 10 breaks at the weakened section, the sliding tie rod 8 begins to play a supporting role.

[0051] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0052] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-hazard defense steel frame structure, characterized in that, The steel frame structure includes: The main body of the steel frame structure (1) includes frame beams and frame columns; the steel frame structure also includes floor slabs, which are fixedly installed on the upper part of the frame beams of each layer of the main body of the steel frame structure (1); The floor slab includes: The flexible base plate (2) includes a flat plate (201) and an annular vertical plate (202). The flat plate (201) is located in the beam-column joint area. The upper surface of the flat plate (201) is provided with an annular vertical plate (202). The annular vertical plate (202) is located at the edge of the frame column. The prefabricated composite slab (3) has holes reserved at the edge of the frame column. The prefabricated composite slab (3) and the flexible bottom plate (2) can be combined to form a closed bottom plane. Cast-in-place surface layer (4), which is cast on the upper surface of the flexible base plate (2) and the precast composite slab (3); The main body of the steel frame structure (1) also includes beam-column nodes, which are located at the junction of the frame beams and frame columns of the main body of the steel frame structure (1). The beam-column joint includes: A sliding tie rod (8) includes a tie rod (801), a fixed slide groove (802), and a limiting member (803); the fixed slide groove (802) is fixedly connected to the upper and lower flanges of the frame beam through a connecting plate extending from the side; the fixed slide groove (802) is provided with a through hole, and the tie rod (801) can slide freely in the hole of the fixed slide groove (802); limiting members (803) are provided at both ends of the tie rod (801); The beam-column joint also includes a double hinged connector (9), which includes a first side plate (901) and a second side plate (902). The first side plate (901) and the second side plate (902) are capable of rotating in opposite directions. The first side plate (901) is capable of being fixedly connected to a cantilever short steel beam, and the second side plate (902) is capable of being fixedly connected to a long steel beam. The beam-column joint also includes a T-shaped energy-dissipating plate (10), which is set at the connection between the short steel beam and the long steel beam. The T-shaped energy-dissipating plate (10) has a weakening section with a T-shaped cross-section in its middle position. In the collapse condition, when the T-shaped energy dissipation plate (10) breaks at the weakened section, the sliding tie rod (8) begins to play a bridging role.

2. The multi-hazard defense steel frame structure according to claim 1, characterized in that: The precast composite slab (3) is provided with protruding anchoring steel bars, and the precast composite slab (3) is connected to the cast-in-place surface layer (4) and the frame beam through the anchoring steel bars.

3. The multi-hazard defense steel frame structure according to claim 1, characterized in that: The main body of the steel frame structure (1) also includes column foot nodes, which are located at the connection position between the frame column and the foundation of the main body of the steel frame structure (1). The column base node includes: The double hinge base (5) has a groove on its upper surface near the edge, and a protrusion on the bottom of the frame column at the edge. The groove of the double hinge base (5) and the protrusion on the bottom of the frame column can be inserted and matched. The double hinge base (5) is set on the upper surface of the foundation. Rigid ring beam (6), the rigid ring beam (6) is circumferentially sleeved and fixed to the outside of the frame column; The bidirectional energy dissipation component (7) has a biaxially symmetrical cross section and is distributed at the corner of the frame column; one end of the bidirectional energy dissipation component (7) is fixedly connected to the upper surface of the double hinged base (5), and the other end is fixedly connected to the lower surface of the rigid ring beam (6).

4. The multi-hazard defense steel frame structure according to claim 3, characterized in that: There is a gap between the inner wall of the groove at the top of the double hinged base (5) and the outer wall of the bottom protrusion of the frame column; the groove of the double hinged base (5) is an arc-shaped structure, and the protrusion at the bottom of the frame column is also an arc-shaped structure.

5. The multi-hazard defense steel frame structure according to claim 3, characterized in that: The rigid ring beam (6) includes: Stiffening plate (601), the stiffening plate (601) is fixed to the outside of the frame column; H-beam (602), the H-beam (602) being fixed to the outside of the frame column and stiffening plate (601); Corner connector (603), which is fixed to the outside of the frame column and located at the corner connection of two adjacent H-beams (602).

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