Low-damage steel frame structure and prefabricated assembly method

Abstract

This invention discloses a low-damage steel frame structure and a prefabrication and assembly method. The structure includes: a foundation, a first frame column, a second frame column, frame beams, floor slabs, beam end connectors, and column bottom connectors. The first frame column is installed on the foundation via column bottom connectors. The second frame column is positioned above the first frame column, with the number of second frame columns determined according to the number of structural floors. The connection points between the first and second frame columns, as well as the connection points between two adjacent second frame columns, are located at the inflection points of each floor. The frame beams are fixedly connected to the second frame columns on both sides via beam end connectors. The floor slab is positioned on the upper surface of the frame beams. This invention enables the beam-column joints and column bottom joints to achieve a bending-shear separation stress mechanism, extending the plastic hinge areas at the beam ends and column bottoms, thereby reducing damage to the beam-column joints and column bottom joints, minimizing residual deformation of the steel frame structure, and improving the seismic toughness of the structure. All structural components can be prefabricated in a factory and assembled on-site, facilitating construction.

Description

Technical Field

[0001] This invention relates to building structures and assembly methods, and in particular to a low-damage steel frame structure and a prefabrication and assembly method. Background Technology

[0002] Steel structures are an increasingly widely used structural form in buildings, possessing excellent seismic performance. Steel frames generally do not experience overall failure or collapse under earthquake loads; instead, they typically suffer localized damage. This localized damage mainly manifests as beam-column connection failure due to welding quality issues and brittle failure of the entire joint due to a small range of plastic hinges. Therefore, it is difficult to meet the ductility design requirements of "strong column-weak beam" and "strong joint-weak member," and the structure exhibits significant residual deformation, making post-earthquake repair difficult or extremely costly, and resulting in low seismic toughness.

[0003] To avoid brittle failure caused by welded connections, many new beam-column joint types using bolted connections have been developed in recent years. However, the typical design pattern for beam-column connections assumes that all bending stress in the beam is borne by the flanges and shear force by the web. In reality, due to boundary conditions arising from column deformation, the beam flanges bear a significant portion of the beam's shear force at the connection, resulting in a complex stress distribution at the beam end flanges. This makes them prone to the formation of plastic hinges, even if the hinge range is small, thus affecting the structure's deformation and load-bearing capacity. Summary of the Invention

[0004] Purpose of the invention: One purpose of this invention is to provide a low-damage steel frame structure with small residual deformation after earthquakes and convenient construction.

[0005] Another objective of this invention is to provide a prefabrication and assembly method for low-damage steel frame structures.

[0006] Technical Solution: A low-damage steel frame structure, comprising: foundation, frame columns, frame beams, floor slabs, and connectors; the frame columns include first frame columns and second frame columns, and the connectors include beam end connectors and column base connectors; the first frame columns are located at the bottom of the structure, with their lower ends fixedly installed on the foundation via column base connectors, and their upper ends sequentially connected to multiple second frame columns according to the number of structural floors, with the connection points of the first and second frame columns, as well as the connection points of two adjacent second frame columns, located at the inflection points of each floor of the structure; both ends of the frame beams are fixedly connected to the second frame columns on both sides via beam end connectors, and the connection points between the frame beams and the second frame columns are located between the connection points at the upper and lower ends of the second frame columns; the floor slabs are set on the upper surface of the frame beams, with both ends fixedly connected to the frame beams and beam end connectors; the frame columns, frame beams, floor slabs, and connectors are all prefabricated in the factory for convenient on-site installation; when the structure is damaged, the damage will be concentrated on the replaceable beam end connectors and column base connectors, reducing the overall degree of damage.

[0007] Optionally, the first frame column includes a first steel body, a first stiffening rib, a third stiffening rib, a first end plate, and a second end plate. The web of the bottom of the first steel body has a first web slot at both ends. The first stiffening ribs are symmetrically arranged on both sides of the web of the bottom of the first steel body. The flange and web of the top of the first steel body are provided with third stiffening ribs. The first end plate and the second end plate are respectively provided on the lower end face and the upper end face of the first steel body.

[0008] Optionally, the first frame column is also provided with a second column stiffening rib. The second column stiffening rib is arranged on both sides of the flange at the bottom of the first steel body. The length of the second column stiffening rib is the same as the length of the slot in the first web, and the second column stiffening rib is provided with slot-shaped holes along the longitudinal direction.

[0009] Optionally, the second frame column includes a second steel body, a fourth column stiffening rib, and a third column end plate. The fourth column stiffening rib is provided on the flanges and webs at the top and bottom of the second steel body. The third column end plate is provided on the upper and lower end faces of the second steel body and is located at the inflection point of each layer of the structure. The first frame column and the second frame column are matched and connected by the third column end plate. Adjacent second frame columns are matched and connected by the third column end plate.

[0010] Optionally, the beam end connector includes a web, flanges, connecting end plates, and a first stiffening plate. The upper and lower ends of the web are longitudinally slotted with second web slots. The webs are arranged in pairs on both sides of the first stiffening plate and welded together. The flanges are arranged at the top and bottom of the web and welded together. The connecting end plates are arranged at both ends of the web and welded together with the web and flanges. The connecting end plates are fixedly connected to the frame beam and the second frame column.

[0011] Optionally, the beam end connector may also include a second stiffening plate, which is arranged on the outer side of the flange. The length of the second stiffening plate is the same as the length of the slot in the second web, and the second stiffening plate is provided with slotted holes along the longitudinal direction.

[0012] Optionally, the beam end connector also includes a first angle steel, a first wear-resistant steel plate, and a connecting steel plate. The pair of first angle steels and first wear-resistant steel plates are arranged on both sides of the second stiffening plate and fixedly connected. The connecting steel plate is arranged below the first angle steel and the frame beam to connect the frame beam and the first angle steel.

[0013] Optionally, the column base connector includes a second angle steel and a second wear-resistant steel plate. The second angle steel is welded as a whole by an L-shaped steel plate and a base plate. The pairs of second angle steel and second wear-resistant steel plates are arranged on both sides of the second column stiffening rib of the first frame column and fixedly connected. The base plate is fixedly connected to the foundation.

[0014] Optionally, the first angle steel of the floor slab and beam end connector is connected by bolts and studs to the frame beam, and the bolts and studs are covered with organic material.

[0015] Based on the same inventive concept, the present invention provides a prefabrication and assembly method for a low-damage steel frame structure, comprising the following steps:

[0016] Prefabricated connectors: After welding the web, flange, connecting end plate, first stiffening plate and second stiffening plate into a whole, the paired first angle steel and first wear-resistant steel plate are arranged on both sides of the second stiffening plate and connected by bolts to complete the prefabrication of the beam end connector; the L-shaped steel plate and the bottom plate are welded into a whole to complete the prefabrication of the column bottom connector;

[0017] Precast frame columns and beams: The location of the inflection point of the frame columns on each floor is determined according to the floor height, and then the length of the first and second frame columns is determined and precast; the length of the frame beams is determined according to the axial spacing of the frame columns and the length of the beam end connectors, and then precast.

[0018] Install the frame columns and column base connectors: After installing the first frame column on top of the foundation, fix the first column end plate to the foundation, arrange the paired second angle steel and second wear-resistant steel plate on both sides of the second column stiffening rib and fix them together, fix the base plate to the foundation, and complete the installation of the first frame column and column base connectors; install the second frame column directly above the first frame column, and fix the second column end plate and the third column end plate together.

[0019] Install the frame beams and beam end connectors: Place the beam end connectors at both ends of the frame beams, and fix the connecting end plates to the beam end plates of the frame beams. Place the connecting steel plates on the lower flange of the frame beams, and fix the lower flange of the frame beams to the first angle steel to complete the assembly of the frame beams and beam end connectors. After hoisting the assembled frame beams and beam end connectors to the design position of the target floor, fix the connecting end plates to the flange of the second frame column.

[0020] Floor slab installation: After installing the non-removable steel plate to the designed position, fix the non-removable steel plate to the first angle steel and fix the non-removable steel plate to the upper flange of the frame beam to complete the installation of the non-removable steel plate; place the steel mesh on top of the non-removable steel plate and then pour concrete to complete the installation of the floor slab.

[0021] Install the remaining floors in sequence following the steps described above to complete the installation of the overall structure.

[0022] Beneficial effects: Compared with the prior art, the present invention has the following significant advantages:

[0023] (1) The present invention sets the vertical connection part of the steel frame structure at the inflection point of the frame column on each floor, which improves the continuity and lateral stiffness of the frame column at the beam-column joint. Furthermore, by setting column bottom connectors at the bottom of the frame column and beam end connectors at the end of the frame beam, the damage to the structure is concentrated on the replaceable connectors, thereby improving the repairability of the structure after the earthquake.

[0024] (2) In this invention, the web of the bottom of the first frame column and the beam end connector is slotted. This approach can promote the formation of a "bending-shear separation" force mechanism at the end sections of the frame column and frame beam, making the force transmission mechanism of key parts such as the column bottom node and beam-column node clearer, expanding the development range of plastic hinges, thereby reducing the residual deformation of the structure and improving the seismic toughness of the structure. In addition, by setting a second column stiffening rib and a second stiffening plate on the flange at the slotted web, the flange at the slotted web forms a buckling-resistance bracing force characteristic, improving the bending bearing capacity at the column bottom node and beam-column node.

[0025] (3) In this invention, a first angle steel, a first wear-resistant steel plate, a second angle steel, and a second wear-resistant steel plate are respectively provided in the beam end connector and the column bottom connector. This approach can form a symmetrical friction force mechanism at the beam-column node and the column bottom node, thereby improving the energy dissipation capacity of the structure.

[0026] (4) In this invention, the floor slab and beam end connectors are connected by bolts, and the floor slab and frame beam are connected by studs. The bolts and studs are covered with organic materials, so that the bolts and studs are tensile but not shear-resistant. This approach can effectively reduce the cracking of the floor slab in the negative bending moment zone. The floor slab and beam end connectors are connected by the first angle steel, which makes it convenient and quick to replace after a disaster.

[0027] (5) The components of this invention can be prefabricated in the factory. On-site assembly only requires a small amount of concentrated post-pouring of floor slabs. The amount of manpower required is small and no formwork or temporary support is needed, which greatly improves construction efficiency. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the low-damage steel frame structure in this invention;

[0029] Figure 2 This is a detailed diagram of the connection between the floor slab and the beam end connector and the frame beam in this invention;

[0030] Figure 3 This is a schematic diagram of the construction of the first frame column in this invention;

[0031] Figure 4 This is a schematic diagram of the construction of the second frame column in this invention;

[0032] Figure 5 This is a detailed diagram showing the connection between the first frame column and the foundation in this invention;

[0033] Figure 6 This is a schematic diagram of the frame beam structure in this invention;

[0034] Figure 7 This is a schematic diagram of the beam end connector in this invention;

[0035] Figure 8 for Figure 7Sectional view of AA in the middle;

[0036] Figure 9 This is a detailed assembly drawing of the beam end connectors;

[0037] Figure 10 This is a schematic diagram of the structure of the column base connector in this invention.

[0038] In the diagram: Foundation 1, Embedded Bolt 11, Frame Column 2, First Frame Column 21, Second Frame Column 22, First Steel Main Body 231, First Web Slotted 2311, Second Steel Main Body 232, First Column Stiffening Rib 241, Second Column Stiffening Rib 242, Third Column Stiffening Rib 243, Fourth Column Stiffening Rib 244, First Column End Plate 251, Second Column End Plate 252, Third Column End Plate 253, Frame Beam 3, H-beam 31, Stud 311, Beam Stiffening Rib 32, Beam End 33. Slab 4. Floor slab 41. Steel plate that can be removed 42. Steel mesh 43. Post-cast concrete 44. Bolt 44. Beam end connector 51. Column bottom connector 52. Web 511. Second web slot 5111. Flange 512. Connecting end plate 513. First stiffening plate 5141. Second stiffening plate 5142. First angle steel 515. First wear-resistant steel plate 516. Connecting steel plate 517. Second angle steel 521. L-shaped steel plate 5211. Base plate 5212. Second wear-resistant steel plate 522. Detailed Implementation

[0039] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0040] like Figure 1-2 As shown, a low-damage steel frame structure of the present invention includes a foundation 1, frame columns 2, frame beams 3, floor slabs 4, beam end connectors 51, and column base connectors 52. The frame columns 2 are symmetrically arranged at both ends of the frame beams 3. The frame columns 2 and the frame beams 3 are connected by the beam end connectors 51, and the frame columns 2 are connected to the foundation 1 by the column base connectors 52. The floor slabs 4 are connected to the frame beams 3 and the beam end connectors 51 by studs 311 and bolts 44, respectively.

[0041] like Figure 2 As shown, the floor slab 4 includes a non-removable steel plate 41, a steel mesh 42, and post-cast concrete 43. Bolt holes are reserved at the intersection of the floor slab 4 and the beam end connector 51. The first angle steel 515 of the floor slab 4 and the beam end connector 51 is connected by bolts 44. Studs 311 are arranged on the upper flange of the frame beam 3. The non-removable steel plate 41 of the floor slab 4 and the frame beam 3 are connected by studs 311. The uprights of the bolts 44 and the studs 311 are covered with organic materials to ensure that the bolts 44 and the studs 311 are pull-out resistant but not shear resistant, thereby reducing floor slab cracking.

[0042] like Figure 3-4As shown, the frame column 2 is divided into a first frame column 21 and a second frame column 22. The first frame column 21 is composed of a first steel body 231, a first column stiffening rib 241, a second column stiffening rib 242, a third column stiffening rib 243, a first column end plate 251, and a second column end plate 252. The web plate at the bottom of the first steel body 231 has slots at both ends, forming a first web plate slot 2311. The first column stiffening ribs 241 are symmetrically arranged on both sides of the web plate at the bottom of the first steel body 231. The first column end plate 251 is located on the lower end face of the first steel body 231. The first steel body 231, the first column stiffening rib 242, and the first column stiffening rib 243 are all connected together. 41 is welded to the first column end plate 251 to form an integral whole; the second column stiffening rib 242 is arranged on both sides of the flange at the bottom of the first steel body 231, the length of the second column stiffening rib 242 is the same as the length of the first web slot 2311, and the second column stiffening rib 242 is provided with a slot-shaped hole along the longitudinal direction; the flange and web at the top of the first steel body 231 are provided with a third column stiffening rib 243, the second column end plate 252 is set on the upper end face of the first steel body 231, and the third column stiffening rib 243 is welded to the second column end plate 252 to form an integral whole; both the first column end plate 251 and the second column end plate 252 are reserved with bolt holes. The second frame column 22 consists of a second steel body 232, a fourth stiffening rib 244, and a third column end plate 253. The fourth stiffening rib 244 is provided on the top and bottom flanges and web of the second steel body 232. The third column end plate 253 is located on the upper and lower end faces of the second steel body 232, at the inflection points of each layer of the structure. The first frame column 21 and the second frame column 22 are connected by matching the second column end plate 252 and the third column end plate 253. Adjacent second frame columns 22 are connected by matching the third column end plate 253. The cross-sectional dimensions and opening form of the third column end plate 253 are the same as those of the second column end plate 252.

[0043] like Figure 1 , 5 As shown, the third column end plate 253 is set at the inflection point of each layer of the structure; the first frame column 21 is located at the bottom of the structure and is fixedly connected to the foundation 1 by pre-embedded bolts 11; the second frame column 22 is located directly above the first frame column 21 and is fixedly connected by the second column end plate 252, the third column end plate 253 and bolts.

[0044] like Figure 1 , 6As shown in Figure -9, the frame beam 3 consists of an H-beam 31, beam stiffeners 32, and beam end plates 33. The beam end connector 51 includes a web 511, flanges 512, connecting end plates 513, a first stiffener 5141, a second stiffener 5142, a first angle steel 515, a first wear-resistant steel plate 516, and a connecting steel plate 517. The web 511 has a second web slot 5111 longitudinally formed at both ends. The webs 511 are arranged in pairs on both sides of the first stiffener 5141 and welded together. The flanges 512 are arranged at the top and bottom of the webs 511 and welded together. The second stiffener 5142 is arranged on the flanges 5111. 2. On the outer side, the length of the second stiffening plate 5142 is the same as the length of the second web slot 5111, and the second stiffening plate 5142 is provided with slot-shaped holes along the longitudinal direction; the connecting end plate 513 is arranged at both ends of the web 511 and welded to the web 511 and the flange 512 to form a whole. The connecting end plate 513 is fixedly connected to the beam end plate 33 of the frame beam 3 and the flange of the second frame column 22 by bolts. The pair of first angle steels 515 and first wear-resistant steel plates 516 are arranged on both sides of the second stiffening plate 5142 and connected by bolts. The connecting steel plate 517 is arranged on the lower flange of the frame beam 3 and is used to connect the frame beam 3 and the first angle steel 515.

[0045] like Figure 5 , 10 As shown, the column base connector 52 includes a second angle steel 521 and a second wear-resistant steel plate 522. The second angle steel 521 is welded into a whole by an L-shaped steel plate 5211 and a base plate 5212. Both the L-shaped steel plate 5211 and the base plate 5212 are provided with reserved holes. The paired second angle steel 521 and the second wear-resistant steel plate 522 are arranged on both sides of the second column stiffening rib 242 and connected by bolts. The base plate 5212 is fixedly connected to the foundation 1 by pre-embedded bolts 11.

[0046] This invention discloses a low-damage steel frame structure that enables beam-column and column-base joints in the steel frame structure to achieve a bending-shear separation stress mechanism, extending the plastic hinge regions at the beam ends and column bases. This reduces damage to the beam-column and column-base joints, minimizes residual deformation of the steel frame structure, and improves the structure's seismic toughness. The components of the low-damage steel frame structure can be prefabricated in a factory and assembled on-site, facilitating construction.

[0047] A prefabrication and assembly method for a low-damage steel frame structure includes prefabricated frame columns, frame beams, and connectors. The prefabricated modules are selected according to the needs of on-site construction to complete the assembly of the low-damage steel frame structure. The method includes the following steps:

[0048] (1) Prefabricated connectors: After welding the web plate 511, flange 512, connecting end plate 513, first stiffening plate 5141 and second stiffening plate 5142 into a whole, the first angle steel 515 and the first wear-resistant steel plate 516 are arranged on both sides of the second stiffening plate 5142 and connected by bolts to complete the prefabrication of the beam end connector 51; the L-shaped steel plate 5211 and the bottom plate 5212 are welded into a whole to complete the prefabrication of the column bottom connector 52.

[0049] (2) Precast frame columns 2 and frame beams 3: Determine the position of the inflection point of each frame column 2 according to the floor height, and then determine the length of the first frame column 21 and the second frame column 22 and precast them; determine the length of the frame beam according to the axial spacing of the frame columns 2 and the length of the beam end connector 51 and precast them.

[0050] (3) Install the frame column 2 and column bottom connector 52: After the first frame column 21 is installed on the top of the foundation 1, the first column end plate 251 is fixedly connected to the foundation by the pre-embedded bolts 11. The pair of second angle steels 521 and second wear-resistant steel plates 522 are arranged on both sides of the second column stiffening rib 242 and connected by bolts. The bottom plate 5212 is fixedly connected to the foundation 1 by the pre-embedded bolts 11, thus completing the installation of the first frame column 21 and column bottom connector 52. The second frame column 22 is installed directly above the first frame column 21, and the second column end plate 252 and the third column end plate 253 are fixedly connected by bolts.

[0051] (4) Install the frame beam 3 and the beam end connector 51: Place the beam end connector 51 at both ends of the frame beam 3, and fix the connecting end plate 513 to the beam end plate 33 of the frame beam 3 with bolts. Place the connecting steel plate 517 on the lower flange of the frame beam 3, and fix the lower flange of the frame beam 3 to the first angle steel 515 with bolts to complete the assembly of the frame beam 3 and the beam end connector 51. After hoisting the assembled frame beam 3 and the beam end connector 51 to the design position of the target floor, fix the connecting end plate 513 to the flange of the second frame column 22 with bolts.

[0052] (5) Install floor slab 4: After installing the non-removable steel plate 41 to the design position, connect the non-removable steel plate 41 to the first angle steel 515 with bolts 44, and connect the non-removable steel plate 41 to the upper flange of the frame beam 3 with studs 311 to complete the installation of the non-removable steel plate 41; arrange the steel mesh 42 above the non-removable steel plate 41, and then pour concrete 43 to complete the installation of floor slab 4;

[0053] (6) Install the remaining floors in sequence according to the above steps to complete the installation of the overall structure.

Claims

1. A low-damage steel frame structure, characterized in that, include: The structure consists of a foundation (1), frame columns (2), frame beams (3), floor slabs (4), and connectors. The frame columns (2) include a first frame column (21) and a second frame column (22). The connectors include beam end connectors (51) and column bottom connectors (52). The first frame column (21) is located at the bottom of the structure. Its lower end is fixedly installed on the foundation (1) through the column bottom connectors (52). The upper end is connected to multiple second frame columns (22) in sequence according to the number of structural floors. The connection points of the first frame column (21) and the second frame column (22), as well as the connection points of two adjacent second frame columns (22), are located at the inflection points of each floor of the structure. Both ends of the frame beam (3) are fixedly connected to the second frame columns (22) on both sides through beam end connectors (51). The connection points of the frame beam (3) and the second frame column (22) are located between the connection points of the upper and lower ends of the second frame column (22), realizing the bending-shear separation force mechanism of the beam-column node and the column bottom node, and extending the plastic hinge area of ​​the beam end and the column bottom. The floor slab (4) is set in the frame. The upper end face of the beam (3) is fixedly connected to the frame beam (3) and the beam end connector (51) at both ends; the frame column (2), frame beam (3), floor slab (4) and connector are all prefabricated in the factory for easy on-site installation; when the structure is damaged, the damage will be concentrated on the replaceable beam end connector (51) and column bottom connector (52), reducing the overall damage level; the beam end connector (51) includes a web (511), flange (512), connecting end plate (513) and first stiffening plate (5141), of which the web The upper and lower ends of the plate (511) are longitudinally provided with second web grooves (5111). The web plates (511) are arranged in pairs on both sides of the first stiffening plate (5141) and welded into a whole. The flanges (512) are arranged on the top and bottom of the web plates (511) and welded into a whole. The connecting end plates (513) are arranged on both ends of the web plates (511) and welded into a whole with the web plates (511) and the flanges (512). The connecting end plates (513) are fixedly connected to the frame beam (3) and the second frame column (22).

2. The low-damage steel frame structure according to claim 1, characterized in that, The first frame column (21) includes a first steel body (231), a first column stiffening rib (241), a third column stiffening rib (243), a first column end plate (251), and a second column end plate (252). The first web groove (2311) is opened at both ends of the web at the bottom of the first steel body (231). The first column stiffening rib (241) is symmetrically arranged on both sides of the web at the bottom of the first steel body (231). The third column stiffening rib (243) is provided on the flange and web at the top of the first steel body (231). The first column end plate (251) and the second column end plate (252) are respectively provided on the lower end face and the upper end face of the first steel body (231).

3. A low-damage steel frame structure according to claim 2, characterized in that, The first frame column (21) is also provided with a second column stiffening rib (242). The second column stiffening rib (242) is arranged on both sides of the flange at the bottom of the first steel body (231). The length of the second column stiffening rib (242) is consistent with the length of the first web slot (2311), and the second column stiffening rib (242) is provided with a slot-shaped hole along the longitudinal direction.

4. A low-damage steel frame structure according to claim 1, characterized in that, The second frame column (22) includes a second steel body (232), a fourth column stiffening rib (244) and a third column end plate (253). The second steel body (232) is provided with a fourth column stiffening rib (244) on the top and bottom flanges and webs. The third column end plate (253) is provided on the upper and lower end faces of the second steel body (232) and located at the inflection point of each layer of the structure. The first frame column (21) and the second frame column (22) are matched and connected by the third column end plate (253). Adjacent second frame columns (22) are matched and connected by the third column end plate (253).

5. A low-damage steel frame structure according to claim 1, characterized in that, The beam end connector (51) also includes a second stiffening plate (5142), which is arranged on the outside of the flange (512). The length of the second stiffening plate (5142) is the same as the length of the second web groove (5111), and the second stiffening plate (5142) is provided with a slotted hole along the longitudinal direction.

6. A low-damage steel frame structure according to claim 5, characterized in that, The beam end connector (51) also includes a first angle steel (515), a first wear-resistant steel plate (516) and a connecting steel plate (517). The first angle steel (515) and the first wear-resistant steel plate (516) are arranged on both sides of the second stiffening plate (5142) and fixedly connected. The connecting steel plate (517) is arranged below the first angle steel (515) and the frame beam (3) and is used to connect the frame beam (3) and the first angle steel (515).

7. A low-damage steel frame structure according to claim 1, characterized in that, The column base connector (52) includes a second angle steel (521) and a second wear-resistant steel plate (522). The second angle steel (521) is welded into a whole by an L-shaped steel plate (5211) and a base plate (5212). The pair of second angle steels (521) and the second wear-resistant steel plates (522) are arranged on both sides of the second column stiffening rib (242) of the first frame column (21) and fixedly connected. The base plate (5212) is fixedly connected to the foundation (1).

8. A low-damage steel frame structure according to claim 1, characterized in that, The first angle steel (515) of the floor slab (4) and the beam end connector (51) is connected by bolts and to the frame beam (3) by studs, and the bolts and studs are covered with organic material.

9. A prefabrication and assembly method for a low-damage steel frame structure as described in claim 6, characterized in that, Includes the following steps: Prefabricated connectors: After welding the web (511), flange (512), connecting end plate (513), first stiffening plate (5141) and second stiffening plate (5142) into a whole, the first angle steel (515) and the first wear-resistant steel plate (516) are arranged on both sides of the second stiffening plate (5142) and connected by bolts to complete the prefabrication of the beam end connector (51); the L-shaped steel plate (5211) and the bottom plate (5212) are welded into a whole to complete the prefabrication of the column bottom connector (52); Precast frame columns (2) and frame beams (3): The position of the inflection point of each frame column (2) is determined according to the floor height, and then the length of the first frame column (21) and the second frame column (22) is determined and precast; the length of the frame beam is determined according to the axial spacing of the frame column (2) and the length of the beam end connector (51) and precast. Install the frame column (2) and column base connector (52): After installing the first frame column (21) on top of the foundation (1), fix the first column end plate (251) to the foundation, arrange the pair of second angle steel (521) and second wear-resistant steel plate (522) on both sides of the second column stiffening rib (242) and fix them together, and fix the bottom plate (5212) to the foundation (1) to complete the installation of the first frame column (21) and column base connector (52); install the second frame column (22) directly above the first frame column (21), and fix the second column end plate (252) and third column end plate (253) together. Install the frame beam (3) and beam end connector (51): Place the beam end connector (51) at both ends of the frame beam (3), and fix the connecting end plate (513) to the beam end plate (33) of the frame beam (3). Place the connecting steel plate (517) on the lower flange of the frame beam (3), and fix the lower flange of the frame beam (3) to the first angle steel (515) to complete the assembly of the frame beam (3) and the beam end connector (51). After hoisting the assembled frame beam (3) and beam end connector (51) to the design position of the target floor, fix the connecting end plate (513) to the flange of the second frame column (22). Install floor slab (4): After installing the non-removable steel plate (41) to the design position, fix the non-removable steel plate (41) to the first angle steel (515), fix the non-removable steel plate (41) to the upper flange of the frame beam (3) to complete the installation of the non-removable steel plate (41); arrange the steel mesh (42) above the non-removable steel plate (41), and then pour concrete (43) to complete the installation of the floor slab (4); Install the remaining floors in sequence following the steps described above to complete the installation of the overall structure.

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