Self-resetting energy dissipation and seismic mitigation steel frame with flexible support and assembly method of self-resetting energy dissipation and seismic mitigation steel frame

Abstract

The invention discloses a self-resetting energy dissipation and shock absorption steel frame with flexible supports and an assembly method. The self-resetting structure gradually becomes a research hot spot, so that the structure can be quickly recovered after an earthquake, and the overhaul of the structure is reduced. The device comprises an I-shaped steel column which is vertically arranged, wherein the I-shaped steel column comprises two I-shaped steel side columns and an I-shaped steel middle column; a steel beam is horizontally arranged between the I-shaped steel columns, and the I-shaped steel columns and the steel beam are connected through sliding friction type beam column joints. The lower parts of the I-shaped steel side columns and the middle parts of the I-shaped steel middle columns are connected with supporting sections; the bottom of the I-shaped steel middle column is connected with a column foot. In the swinging process, the deformation range of the frame can be controlled, and the self-resetting function is achieved, so that safety and reliability are achieved; all the components are prefabricated components, and assembling and construction are easy.

Description

Technical Field

[0001] The invention belongs to the technical field of building structures, and in particular relates to a self-resetting energy-absorbing and shock-absorbing steel frame with flexible supports and an assembly method thereof. Background Art

[0002] As a main form of building structure, steel structure has the characteristics of high strength, light weight, good deformation ability, etc. Steel structure is superior to concrete structure, and can greatly reduce the use of sand, stone, and cement, and reduce the exploitation of non-renewable resources; in addition, in the event of earthquakes and typhoon disasters, steel structure can avoid the collapse and destruction of buildings by giving full play to its good ductility and strong plastic deformation ability. With the rapid development of economy and technology, my country's steel structure industry has developed rapidly in recent years, especially widely used in industrial plants, low-rise residential buildings and other structures; due to the advantages of short construction period, less wet work and convenient production and installation, it is deeply loved by people. In addition, traditional steel frames often use rigid supports to enhance the lateral stiffness of the structure, but they are prone to irreversible deformation after the earthquake and can no longer meet the requirements of strength and stiffness. Therefore, the present invention proposes a flexible support to improve the seismic performance of steel frames.

[0003] Earthquake resistance is the main consideration in structural design. Although steel structures have good earthquake resistance, they will produce irreversible plastic deformation under the action of a large earthquake, such as damage to column bases and beam-column joints, which will have an adverse effect on the post-earthquake recovery of the structure.

[0004] Self-resetting structures have gradually become a research hotspot. They can enable structures to recover quickly after an earthquake, reduce structural overhauls, and bring better economic benefits. They can cooperate with the swing deformation of the structure to release some of the connection constraints of the structure, so that it produces deformation displacement, which significantly improves the energy dissipation and shock absorption of the structure. For steel frames, plastic zones are easily formed at the ends of beams or the bottoms of columns after an earthquake. Although the expected energy dissipation and earthquake resistance goals can be achieved through their own components, they are usually severely damaged in the plastic hinge area of ​​the components, making it difficult to repair the structure after an earthquake, resulting in high economic losses. Therefore, applying self-resetting and swinging methods to steel structures is of great significance for improving their earthquake resistance. Summary of the invention

[0005] In order to make up for the deficiencies of the prior art, the present invention provides a self-resetting energy-absorbing and shock-absorbing steel frame with flexible supports and an assembly method, which solves the problem in the prior art that the steel structure is prone to irreversible damage after an earthquake.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A self-resetting energy-absorbing and shock-absorbing steel frame with flexible support, characterized in that:

[0008] It includes a vertically arranged I-shaped steel column, wherein the I-shaped steel column includes two I-shaped steel side columns and one I-shaped steel middle column;

[0009] Steel beams are horizontally arranged between the I-shaped steel columns, and the I-shaped steel columns and the steel beams are connected via sliding friction beam-column nodes; support sections are connected to the lower part of the I-shaped steel side columns and the middle part of the I-shaped steel middle columns; and a column foot is connected to the bottom of the I-shaped steel middle column.

[0010] Furthermore, two upper and lower short beams are horizontally arranged on the inner side of the I-shaped steel side column, and two short beams are respectively arranged on the left and right sides of the I-shaped steel middle column; the short beams are parallel up and down.

[0011] Furthermore, the steel beam adopts an I-shaped steel beam section, and bottom groove-shaped holes and side groove-shaped holes are respectively arranged on the upper and lower flanges and the web.

[0012] Furthermore, the beam-column node includes a friction bottom plate, a friction side plate and high-strength bolts, which are used to connect the short beam and the steel beam; an L-shaped angle steel is arranged on the left and right sides of the inner side of the upper and lower flanges of the steel beam, and an SMA rod is arranged on the L-shaped angle steel, which is connected to the flange of the I-shaped steel column; a triangular rib plate is arranged next to each L-shaped angle steel.

[0013] Furthermore, the support section includes two symmetrically arranged deformation sections and a rigid section in the middle, the deformation section includes a pin shaft, and the lower end of the pin shaft is connected to the first connecting plate, the second connecting plate and the third connecting plate in sequence; a trapezoidal sleeve is fixedly connected to the lower side of the third connecting plate, a Y-shaped sliding sleeve is fixedly connected to the trapezoidal sleeve, and a Y-shaped cylinder is slidably connected to the inside of the Y-shaped sliding sleeve; a trapezoidal sleeve is connected to the exposed end of the Y-shaped cylinder, and the trapezoidal sleeve is connected to the rigid section in the middle through the third connecting plate; three groups of disc spring groups are arranged in the height direction of the internal space of the Y-shaped sliding sleeve, and compressible sleeves are arranged on the outer periphery of the disc spring group and the Y-shaped sliding sleeve; three steel strands are arranged between the upper and lower third connecting plates.

[0014] Furthermore, a slot-shaped hole is provided on the Y-shaped cylinder, which is an elliptical groove; a circular groove is provided on the Y-shaped sliding sleeve, the diameter of the circular groove is smaller than the slot-shaped hole, and high-strength bolts are provided in the slot-shaped hole and the circular groove.

[0015] Furthermore, the rigid section of the support section includes a filled steel pipe section, which is composed of a circular sleeve and filled with concrete.

[0016] Furthermore, the disc spring assembly includes a disc spring single piece, and buffer plates are arranged at both ends of the disc spring single piece.

[0017] Furthermore, the column base includes a connecting plate, which is welded to the I-shaped steel center column; two disc spring box bodies are symmetrically arranged between the connecting plate and the foundation below, and a pin shaft is arranged between the two disc spring box bodies; the pin shaft includes an upper and lower part, and the upper and lower parts are rotatably connected by bolts; two disc spring groups are arranged in each disc spring box body, and a core rod is vertically penetrated in the disc spring group; a top plate is arranged on the top of the disc spring group, and a pad is arranged on the bottom; an elastic sleeve is arranged between the disc spring box body and the connecting plate.

[0018] A method for assembling a self-resetting energy-absorbing and shock-absorbing steel frame with flexible supports comprises the following steps:

[0019] Step 1: Hoist three I-shaped steel columns with welded stiffening ribs and place them in corresponding positions;

[0020] Step 2: Weld the center column and the connecting plate together, then pass the core rod through the connecting plate, elastic sleeve, disc spring box body, top plate and disc spring assembly to form a whole, and connect the pins of the upper and lower parts together with bolts;

[0021] Step 3: Align the holes on the stiffening ribs and steel beams with the holes on the friction bottom plate and friction side plate one by one, and connect them with energy-absorbing bolts to ensure a reliable connection between the beams and columns;

[0022] Step 4: Weld the angle steel at the corresponding position of the steel beam, and punch holes to install and fix the SMA rod;

[0023] Step 5: Lift the support section and fix it at the corresponding steel column position.

[0024] Beneficial effects of the present invention:

[0025] 1) The self-resetting energy-absorbing and shock-absorbing steel frame with flexible support of the present invention is reinforced by adding ribs in the I-shaped steel column node area, which can avoid the damage of the friction-type energy-absorbing node connecting the steel column; at the same time, the steel beam is connected to the steel column through the friction-type energy-absorbing node. This node is a friction-type energy-absorbing node with a recovery function. The left and right ends are respectively connected to the steel column and the steel beam. By applying prestress, the sliding bottom plate frictionally consumes seismic energy, and the bending resistance and self-resetting performance of the node are enhanced by SMA; the support section is a controllable variable flexible support, which can allow the frame to produce a certain deformation while limiting the deformation of the frame. The support section is too large to make the structure safe and reliable and avoid irreversible damage. The support section is the safety guarantee of the frame. When the steel node is damaged by friction, the support can effectively prevent the structure from collapsing. The support section is equipped with a disc spring group and a steel strand. During an earthquake, the disc spring group dissipates energy through compression deformation through the sliding device inside the support, and restores deformation by using the elastic properties of the disc spring and steel strand. The sliding device inside the support section is equipped with a sleeve, which can cause the support to produce axial deformation within a certain range. The integrated disc spring group at the column foot cooperates with the pin shaft, which can dissipate energy through the disc spring during the swinging process and limit its swinging range.

[0026] 2) All components of the self-resetting energy-absorbing steel frame with flexible supports in the present invention are prefabricated components, which are simple to operate and easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a self-resetting energy-absorbing and shock-absorbing steel frame with flexible support of the present invention;

[0028] Figure 2 It is a front view of a self-resetting energy-absorbing and shock-absorbing steel frame with flexible support of the present invention;

[0029] Figure 3 It is a structural schematic diagram of a steel column in a self-resetting energy-absorbing and shock-absorbing steel frame with flexible support of the present invention;

[0030] Figure 4 It is a structural schematic diagram of a steel beam in a self-resetting energy-absorbing and shock-absorbing steel frame with flexible support of the present invention;

[0031] Figure 5 It is a structural schematic diagram of a support section in a self-resetting energy-absorbing and shock-absorbing steel frame with flexible support of the present invention;

[0032] Figure 6 It is a structural schematic diagram of a support segment disc spring group in a self-resetting energy-absorbing and shock-absorbing steel frame with flexible support of the present invention;

[0033] Figure 7 It is a front view of a disc spring assembly in a supporting section of a self-resetting energy-absorbing and shock-absorbing steel frame with flexible support of the present invention;

[0034] Figure 8 It is a structural schematic diagram of a supporting sliding section in a self-resetting energy-absorbing and shock-absorbing steel frame with flexible support of the present invention;

[0035] Fig. 9 It is a structural schematic diagram of a column foot in a self-resetting energy-absorbing and shock-absorbing steel frame with flexible support of the present invention;

[0036] Fig.10 It is a cross-sectional view of a column foot in a self-resetting energy-absorbing and shock-absorbing steel frame with flexible support according to the present invention;

[0037] Fig.11 It is a structural schematic diagram of a steel node in a self-resetting energy-absorbing and shock-absorbing steel frame with flexible support of the present invention;

[0038] Fig.12 It is a cross-sectional view of a steel node in a self-resetting energy-absorbing and shock-absorbing steel frame with flexible support of the present invention;

[0039] In the figure: 1. I-shaped steel column, 101. I-shaped steel side column, 102. short beam, 103. I-shaped steel middle column, 104. bottom groove hole, 105. round hole, 106. side groove hole; 2. steel beam, 201. I-shaped steel beam, 202. bottom groove hole, 203. side groove hole; 3. support section, 301. pin, 302. first connecting plate, 303. second connecting plate, 304. third connecting plate, 305. trapezoidal sleeve, 306. compressible sleeve, 307. filling steel pipe section, 308. disc spring group, 3081. disc spring single Plate, 3082. Buffer plate, 309. Y-type sliding sleeve, 310. Y-type cylinder, 311. High-strength bolts, 312. Slotted holes, 313. Steel strands; 4. Column base, 401. Core rod, 402. Connecting plate, 403. Elastic sleeve, 404. Disc spring box, 405. Foundation, 406. Pin, 407. Disc spring assembly, 408. Pad, 409. Top plate, 410. Bolts; 5. Beam-column node, 501. L-shaped angle steel, 502. SMA rod, 503. Angle steel, 504. Friction bottom plate, 505. Friction side plate, 506. High-strength bolts. DETAILED DESCRIPTION

[0040] The present invention is described in detail below in conjunction with specific implementation modes.

[0041] The present invention includes a steel column section, a steel beam section and a support section. The inner side of the side column is connected to a short beam, and the middle steel column is connected to the short beam on both sides. The steel column and the steel beam are connected by bolts through a friction cover plate, and two SMA rods are provided on the upper and lower flanges of the steel beam, which can enable the structure to consume seismic energy through the friction plate during the swinging process, and provide reset capability through the superelastic performance of the SMA rod; the support section is a flexible support with controllable deformation, which can allow the frame to produce a certain deformation while limiting the deformation of the frame; the middle column foot is connected to the foundation through a box disc spring group and a pin shaft combination, which can control the deformation range of the frame during the swinging process, and has a self-reset function, safe and reliable; all components are prefabricated components, which are simple to assemble and construct and easy to implement. The specific structure is as follows:

[0042] like Figure 1 , 2 As shown, the present invention comprises a vertically arranged I-shaped steel column 1, wherein the I-shaped steel column 1 comprises two I-shaped steel side columns 101 and one I-shaped steel middle column 103; steel beams 2 are horizontally arranged between the I-shaped steel columns 1, and the I-shaped steel column 1 and the steel beams 2 are connected via a beam-column node 5 of a sliding friction shape; steel beams 2 are respectively arranged at the top and the middle of the I-shaped steel column 1; a support section 3 is connected to the lower part of the I-shaped steel side column 101 and the middle part of the I-shaped steel middle column 103; the bottom of the support section 3 is connected to the bottom of the side column, and the top of the support section 3 is connected to the lower part of the steel beam in the middle of the middle column; a high-strength steel sheet is welded at the column root of the side column, and a high-strength steel sheet is welded below the connection between the middle column and the short beam, so that the support section 3 is connected to the two steel sheets via a pin shaft; the bottom of the I-shaped steel middle column 103 is connected to a column foot 4;

[0043] like Figure 3 , 4 As shown, two short beams 102 are horizontally arranged on the inner side of the I-shaped steel side column 101, and two short beams 102 are arranged on the left and right sides of the I-shaped steel middle column 103; the short beams 102 are parallel up and down, which can improve the tensile strength of the steel column 1, and four slot holes 104 of the same size are arranged on the upper and lower flanges of the short beam 102, and slot holes 106 of the same size as the flanges are arranged on the web of the short beam 102. The short beam 102 adopts an I-shaped steel section. The steel beam 2 adopts an I-shaped steel beam section, and bottom slot holes 202 and side slot holes 203 are respectively arranged on the upper and lower flanges and webs, and the sizes and positions are the same as those of the short beam 102.

[0044] like Fig.11 , 12 As shown, the beam-column node 5 includes a friction bottom plate 504, a friction side plate 505 and high-strength bolts 506, which are used to connect the short beam 102 and the steel beam 2; an L-shaped angle steel 501 is arranged on the left and right sides of the inner side of the upper and lower flanges of the steel beam 2, and an SMA rod 502 is arranged on the L-shaped angle steel 501, which is connected to the flange of the I-shaped steel column 1; a triangular rib is arranged next to each L-shaped angle steel 501 for reinforcement.

[0045] The beam-column node 5 is a friction-type energy-dissipating node with a restorable function. The main working mechanism is: when the structure sways, the connection between the column and the beam is prone to irreversible damage. When the structure sways, the friction bottom plate 504 and the friction side plate 505 connected at the flange and web of the short beam 103 at the beam-column node 5 generate sliding friction through the joint action of the high-strength bolts 506. The SMA rod 502 generates a certain tensile stress by applying prestress. The SMA rod 502 uses its own functional characteristics to restore the node 5 to its original state through its own elastic restoring force after the earthquake.

[0046] like Figure 5 , 6 As shown in , 7 and 8, the support section 3 includes two symmetrically arranged deformation sections and a middle rigid section, the deformation section includes a pin shaft 301, the lower end of the pin shaft 301 is sequentially connected to the first connecting plate 302, the second connecting plate 303 and the third connecting plate 304; a trapezoidal sleeve 305 is fixedly connected below the third connecting plate 304, a Y-shaped sliding sleeve 309 is fixedly connected to the trapezoidal sleeve 305, and a Y-shaped cylinder 310 is slidably connected inside the Y-shaped sliding sleeve 309; the exposed end of the Y-shaped cylinder 310 is connected to the trapezoidal sleeve 305, and the trapezoidal sleeve 305 is connected to the middle rigid section through the third connecting plate 304;

[0047] Three sets of disc spring groups 308 are arranged in the inner space of the Y-shaped sliding sleeve 309 along the height direction, and a compressible sleeve 306 is arranged on the periphery of the disc spring group 308 and the Y-shaped sliding sleeve 309; three steel strands 313 are arranged between the upper and lower third connecting plates 304. The steel strands are connected to the end of the deformation section by applying prestress around the compressible sleeve.

[0048] The Y-shaped cylinder 310 is provided with a slot-shaped hole 312, which is an elliptical groove; the Y-shaped sliding sleeve 309 is provided with a circular groove, the diameter of which is smaller than the slot-shaped hole 312, and high-strength bolts 311 are arranged in the slot-shaped hole 312 and the circular groove. The rigid section of the support section 3 includes a filled steel pipe section 307, which is composed of a circular sleeve and concrete filled inside. The disc spring group 308 includes a disc spring single piece 3081, and buffer plates 3082 are arranged at both ends of the disc spring single piece 3081.

[0049] When an earthquake occurs, the entire frame structure sways and the support section 3 is deformed. At this time, it is connected to the frame through the pin 301, receives earthquake energy, and transmits the energy to the Y-shaped sleeve 309, pushing it to slide, so that the high-strength bolt 311 slides within the range of the slotted hole 312 in the Y-shaped cylinder 310, which can dissipate part of the earthquake energy. At the same time, due to the compression deformation of the entire support section 3, the disc spring single piece 3081 of the disc spring group 308 is squeezed, but due to the unique performance of the disc spring piece 3081, coupled with the effect of the steel strand 313, the originally deformed support section 3 begins to slowly restore its original shape, so that the support section 3 can still dissipate energy and continue to be used when the next earthquake occurs. The compressible sleeve 306 in this support section 3 is a segmented embedded sleeve with the characteristics of tensile and compressive deformation, while the sleeve 307 is a filled steel pipe section and will not deform.

[0050] like Fig. 9 , 10 As shown, the column foot 4 includes a connecting plate 402, which is welded to the I-shaped steel center column 103; two disc spring boxes 404 are symmetrically arranged between the connecting plate 402 and the foundation 405 below, and a pin 406 is arranged between the two disc spring boxes 404; the pin 406 includes an upper and lower part, which are rotatably connected by a bolt 410; two disc spring groups 407 are arranged in each disc spring box 404, and a core rod 401 vertically penetrates the disc spring group 407; a top plate 409 is arranged on the top of the disc spring group 407, and a pad 408 is arranged on the bottom; an elastic sleeve 403 is arranged between the disc spring box 404 and the connecting plate 402.

[0051] The main energy-absorbing component of the rocking column foot 4 is an integrated disc spring device, and its main working mechanism is: when an earthquake occurs, the rocking of the middle column 104 will drive the disc spring 407 to compress and deform through the rotation of the pin shaft 406. At this time, since the disc spring single piece in the disc spring group 407 at both ends of the column foot 4 begins to compress, it can absorb and dissipate part of the energy and reduce the damage caused by the earthquake; during the rocking process, the disc spring piece is reset through the elastic compression deformation, and the disc spring piece can constrain the rocking range of the column.

[0052] The working principle of the present invention is as follows:

[0053] When subjected to a large horizontal load, the side column 101 will begin to deform due to its good elastic deformation ability, and push the cross beam 2 to make the middle column 104 begin to swing and deform; the beam end 2 will also produce a large bending moment due to deformation, and the steel node 5 will deform under the large bending moment. The friction plates 504 and 505 slide against each other to produce friction deformation and dissipate part of the energy. The SMA rod 502 on the tension side will also be stretched and elongated; the swing of the middle column 104 will drive the disc spring 407 to compress and deform through the rotation of the pin 406; the middle support 3 will also be stretched or compressed to produce axial deformation. When the deformation is too large, the limit deformation of the support 3 is reached, and the support 3 becomes rigid to limit the deformation of the frame. After unloading, the frame is reset under the elastic recovery of the SMA rod 502, the disc spring 308 and the steel strand 313. In this process, the frame dissipates energy through the swing of the friction plates 504 and 505 at the steel beam node 5 and the middle column 104.

[0054] The assembly method of the self-resetting energy-absorbing and shock-absorbing steel frame with flexible support of the present invention comprises the following steps:

[0055] Step 1: hoist three I-shaped steel columns 1 welded with stiffening ribs and place them at corresponding positions;

[0056] Step 2: Weld the center column 1 and the connecting plate 402 together, then pass the core rod 401 through the connecting plate 402, the elastic sleeve 403, the disc spring box body 404, the top plate 409 and the disc spring assembly 407 to form a whole, and connect the pin shafts 406 of the upper and lower parts together by bolts 410;

[0057] Step 3: Align the holes on the stiffening ribs and the steel beam 2 with the holes on the friction bottom plate 504 and the friction side plate 505 one by one, and connect them with energy-absorbing bolts 506 to ensure a reliable connection between the beam and the column;

[0058] Step 4: Weld angle steel at the corresponding position of the steel beam 2, and punch holes to install and fix the SMA rod 502;

[0059] Step 5: Lift the support segment 3 and fix it at the corresponding steel column position.

[0060] The Y-shaped cylinder 310 and the trapezoidal sleeve 305 are reliably connected to the third connecting plate 304, the rigid sleeve 307 is welded to the third connecting plate 304, and then the pin 301 is anchored into the first connecting plate 302, and the first connecting plate 302 and the second connecting plate 303 are welded. Then, the sleeve 310 is installed in the trapezoidal sleeve 305 according to the corresponding size, and the high-strength bolts 311 are installed in the corresponding hole positions, and then the disc spring assembly 308 is installed around the Y-shaped sleeve 309. Finally, the outer compressible sleeve 306 is tightly sleeved and three steel strands 313 are installed on the surrounding upper and lower connecting plates 304. Then, the installed support section 3 is overlapped with the steel column 1 to complete the assembly.

[0061] The self-resetting energy-absorbing and shock-absorbing steel frame with flexible support of the present invention can deform the frame under the swing of the central column and drive the nodes at the ends of the steel beams to consume energy. The support can allow the frame to deform and limit the large deformation of the frame. The various parts work together to enable the frame to have the functions of deformation, energy consumption and self-resetting. In addition, the prefabricated components bring convenience to on-site construction, significantly reduce the construction difficulty and shorten the construction period.

[0062] In the description of the present invention, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect", and "fix" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] The content of the present invention is not limited to the embodiments listed, and any equivalent changes made to the technical solution of the present invention by ordinary technicians in this field after reading the description of the present invention are covered by the claims of the present invention.

Claims

1. A self-resetting energy-absorbing and shock-absorbing steel frame with flexible support, characterized in that: It comprises an I-shaped steel column (1) arranged vertically, wherein the I-shaped steel column (1) comprises two I-shaped steel side columns (101) and one I-shaped steel middle column (103); A steel beam (2) is horizontally arranged between the I-shaped steel columns (1), and the I-shaped steel columns (1) and the steel beam (2) are connected via a beam-column node (5) of a sliding friction type; The lower part of the I-shaped steel side column (101) and the middle part of the I-shaped steel middle column (103) are connected with a support section (3); The bottom of the I-shaped steel center column (103) is connected to a column foot (4).

2. A self-resetting energy-absorbing and shock-absorbing steel frame with flexible support according to claim 1, characterized in that: Two upper and lower short beams (102) are horizontally arranged inside the I-shaped steel side column (101), and two short beams (102) are respectively arranged on the left and right sides of the I-shaped steel middle column (103); the short beams (102) are parallel to each other.

3. A self-resetting energy-absorbing and shock-absorbing steel frame with flexible support according to claim 2, characterized in that: The steel beam (2) is an I-shaped steel beam section, and bottom groove-shaped holes (202) and side groove-shaped holes (203) are respectively arranged on the upper and lower flanges and the web.

4. A self-resetting energy-absorbing and shock-absorbing steel frame with flexible support according to claim 3, characterized in that: The beam-column node (5) comprises a friction bottom plate (504), a friction side plate (505) and high-strength bolts (506), which are used to connect the short beam (102) and the steel beam (2); An L-shaped angle steel (501) is arranged on the left and right sides of the inner sides of the upper and lower flanges of the steel beam (2), and an SMA rod (502) is arranged on the L-shaped angle steel (501) and connected to the flange of the I-shaped steel column (1); A triangular rib is provided beside each L-shaped angle steel (501).

5. A self-resetting energy-absorbing and shock-absorbing steel frame with flexible support according to claim 4, characterized in that: The support section (3) comprises two symmetrically arranged deformation sections and a rigid section in the middle, the deformation section comprises a pin shaft (301), the lower end of the pin shaft (301) is sequentially connected to a first connecting plate (302), a second connecting plate (303) and a third connecting plate (304); a trapezoidal sleeve (305) is fixedly connected below the third connecting plate (304), a Y-shaped sliding sleeve (309) is fixedly connected to the trapezoidal sleeve (305), and a Y-shaped cylinder (310) is slidably connected inside the Y-shaped sliding sleeve (309); the exposed end of the Y-shaped cylinder (310) is connected to the trapezoidal sleeve (305), and the trapezoidal sleeve (305) is connected to the rigid section in the middle through the third connecting plate (304); Three sets of disc spring groups (308) are arranged in the internal space of the Y-shaped sliding sleeve (309) along the height direction, and a compressible sleeve (306) is arranged on the periphery of the disc spring group (308) and the Y-shaped sliding sleeve (309); three steel strands (313) are arranged between the upper and lower third connecting plates (304).

6. The self-resetting energy-absorbing and shock-absorbing steel frame with flexible support according to claim 5 is characterized in that: The Y-shaped cylinder (310) is provided with a slot-shaped hole (312) which is an elliptical groove; the Y-shaped sliding sleeve (309) is provided with a circular groove whose diameter is smaller than the slot-shaped hole (312); high-strength bolts (311) are provided in the slot-shaped hole (312) and the circular groove.

7. A self-resetting energy-absorbing and shock-absorbing steel frame with flexible support according to claim 6, characterized in that: The rigid section of the support section (3) comprises a filled steel pipe section (307), which is composed of a circular sleeve and filled with concrete.

8. The self-resetting energy-absorbing and shock-absorbing steel frame with flexible support according to claim 7 is characterized in that: The disc spring assembly (308) comprises a disc spring single piece (3081), and buffer sheets (3082) are arranged at both ends of the disc spring single piece (3081).

9. A self-resetting energy-absorbing and shock-absorbing steel frame with flexible support according to claim 8, characterized in that: The column foot (4) comprises a connecting plate (402), and the connecting plate (402) is welded to the I-shaped steel center column (103); Two disc spring boxes (404) are symmetrically arranged between the connecting plate (402) and the base (405) below, and a pin shaft (406) is arranged between the two disc spring boxes (404); the pin shaft (406) includes an upper and a lower part, and the upper and lower parts are rotatably connected by a bolt (410); Two disc spring groups (407) are arranged in each disc spring box body (404), and a core rod (401) vertically penetrates the disc spring group (407); a top plate (409) is arranged on the top of the disc spring group (407), and a pad (408) is arranged on the bottom; and an elastic sleeve (403) is arranged between the disc spring box body (404) and the connecting plate (402).

10. An assembly method of a self-resetting energy-absorbing and shock-absorbing steel frame with flexible support, characterized in that: The following steps are involved: Step 1: hoist three I-shaped steel columns (1) with welded stiffening ribs and place them at corresponding positions; Step 2: Weld the center column (1) and the connecting plate (402) together, then pass the core rod (401) through the connecting plate (402), the elastic sleeve (403), the disc spring box (404), the top plate (409) and the disc spring assembly (407) to form a whole, and connect the pins (406) of the upper and lower parts together by bolts (410); Step 3: Align the holes on the stiffening ribs and the steel beam (2) with the holes on the friction bottom plate (504) and the friction side plate (505) one by one, and connect them with energy-absorbing bolts (506) to ensure a reliable connection between the beam and the column; Step 4: Weld angle steel at the corresponding position of the steel beam (2), and punch holes to install and fix the SMA rod (502); Step 5: Lift the support section (3) and fix it at the corresponding steel column position.

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