High-strength steel combined multi-chamber box-shaped cross-section bending steel member and manufacturing method

Abstract

The present application relates to the field of steel component engineering, and particularly relates to a high-strength steel combined multi-chamber box-shaped cross-section bending steel component and a manufacturing method, and the specific steps are as follows: S1: obtaining a design form of the steel component; S2: preparing an outer chamber of the steel component; S3: applying a prestress to the outer chamber along the axial direction of the outer chamber to bend the outer chamber to a first form, and obtaining a first eccentricity value of the first form, the first eccentricity value being greater than a design eccentricity value; S4: applying a top pressure to the first form to a second form, the second form being in a pre-tightening state, and obtaining a second eccentricity value of the second form, the second eccentricity value being less than the design eccentricity value; S5: keeping the outer chamber in the second form, and welding a matched inner chamber to obtain the steel component; and S6: after unloading the force, the inner chamber is subjected to a pre-tension stress, and the outer chamber is subjected to a pre-compression stress, and the obtained steel component is obtained. The present application applies a pre-tension stress to the inner side of the steel component and a pre-compression stress to the outer side, so that the axial compression buckling limit load of the bending steel component is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel structure engineering, and particularly relates to a high-strength steel combined multi-chamber box-shaped section bending steel member and a manufacturing method. BACKGROUND

[0002] With the deep integration of digital construction technology and architectural aesthetic concepts, many special-shaped curved buildings with unique shapes and novel structures have emerged. The traditional structure uses straight rods to fit curves, which often cannot directly express the spatial curved aesthetic effect of the building through structural members. The application of curved members provides a practical way for this pursuit.

[0003] As the core load-bearing unit for realizing complex curved shapes, the bearing capacity and stability control of the curved steel member have become a key technical bottleneck restricting architectural innovative design and structural safety. As shown in the following table, for the curved steel member using the traditional single box chamber, the following inherent defects exist under the axial compression working condition: Figure 8

[0004] (1) Asymmetrical stress and material performance imbalance:

[0005] The curvature characteristics of the curved member cause the cross-section stress distribution to be significantly asymmetric. Under the combined action of axial compression and bending moment, the inner plate enters the plastic stage or local buckling first due to stress concentration, while the outer plate is still in the elastic working state. This uneven stress makes the overall bearing capacity of the member only reach 60%-75% of the theoretical bearing capacity of the material, resulting in low utilization rate of steel strength.

[0006] (2) Stability performance degradation caused by curvature effect:

[0007] The geometric relationship between the curvature radius and the cross-sectional size directly affects the buckling mode of the member. The two-way curvature characteristics of the curved box member will induce coupled buckling effect, and the overall stability coefficient is lower than that of the straight rod member with the same cross-section. At the same time, the face and outer deformation sensitivity of the curved plate under the action of normal pressure increases significantly, and the local stability bearing capacity decreases significantly.

[0008] (3) Construction form and stress demand mismatch:

[0009] The stiffener arrangement principle of the symmetric box section in the current specification cannot adapt to the stress and deformation characteristics of the curved member.

[0010] ​The prior art improvement scheme such as the local buckling stiffening rib structure and design method (CN 120006835 A) mainly solves the local buckling problem of the plate of the box straight bar; and the bending-torsion box member and manufacturing process (CN 103056616 A) sets the stiffening rib inside the box section member to ensure the forming of the bending-torsion member. The above prior art and improvement scheme cannot systematically solve the essential contradiction between the stress gradient distribution and the structural adaptability in the bending member. Especially in the member with large initial bending (such as > L / 100), the above scheme still faces the technical defects of poor axial compression stability performance, local buckling of the inner plate in bending, etc. SUMMARY

[0011] The purpose of the present application is to provide a high-strength steel combined multi-chamber box section bending steel member and a manufacturing method to solve the problems in the background art.

[0012] To solve the above technical problems, the present application adopts the following scheme:

[0013] A manufacturing method of a high-strength steel combined multi-chamber box section bending steel member, comprising the following steps:

[0014] S1: obtaining the design shape of the steel member to obtain the design eccentricity value of the steel member;

[0015] S2: preparing the outer chamber of the steel member;

[0016] S3: applying a pre-stress to the outer chamber along the axial direction of the outer chamber to bend the outer chamber to a first shape, and obtaining a first eccentricity value of the first shape, the first eccentricity value being greater than the design eccentricity value;

[0017] S4: applying a top pressure towards the inner side of the bending to the first shape to a second shape, the second shape being in a pre-tightened state, and obtaining a second eccentricity value of the second shape, the second eccentricity value being less than the design eccentricity value;

[0018] S5: the outer chamber remains in the second shape, and the inner chamber is welded inside the outer chamber to obtain the steel member, at this time, the steel member is in a third shape, and a third eccentricity value of the third shape is obtained, the third eccentricity value being equal to the second eccentricity value;

[0019] S6: gradually unloading the top pressure, after unloading, the inner chamber is subjected to a pre-tension stress, and the outer chamber is subjected to a pre-compression stress, to obtain the steel member with the design shape and the design eccentricity value.

[0020] Optionally, in S2, the first shape of the outer chamber and the first eccentricity value under the first shape are obtained according to the pre-stress to be applied to the steel member combined with finite element analysis, and the high-strength steel plate is welded to form the box-shaped outer chamber with a rectangular cross section.

[0021] Optionally, in S4, the jacks are used to apply jacking pressure to the curved inner side of the outer chamber to perform jacking displacement to apply forced displacement.

[0022] Optionally, the jacking point position of the jack and the second shape and second eccentricity of the offset outer chamber are determined by finite element simulation analysis, and the jacking stress is not higher than the yield strength of high-strength steel.

[0023] Optionally, in S5, the finite element simulation is used to find the shape, cut and process the inner chamber steel plate, and the inner chamber is welded under the condition that the outer chamber is kept jacked.

[0024] Optionally, the width ratio of the inner chamber to the outer chamber is 0.2≤width ratio≤0.5.

[0025] Optionally, the inner flange plate and the web plate of the inner chamber are made of high-strength steel, the thickness of the inner flange plate is greater than the thickness of the outer flange plate, the thickness of the inner flange plate is Tn, the thickness of the outer flange plate is Tw, the width of the inner flange plate is Bn, and the width of the outer flange plate is Bw, Tw≥Bw / 40, and Tn≥Bn / 16.

[0026] Optionally, the middle part of the formed steel member is a plastic strengthening area, both sides of the plastic strengthening area are non-strengthening areas, the outside of the non-strengthening area is a node strengthening area, the web plate of the inner chamber in the plastic strengthening area is a wedge-shaped steel plate; the web plate of the inner chamber in the node strengthening area is a wedge-shaped steel plate; and the web plate of the inner chamber in the non-strengthening area is a flat steel plate.

[0027] Optionally, a plurality of reinforcing plates made of high-strength steel are welded along the axial direction of the steel member in the inner chamber, the plurality of reinforcing plates are equally spaced along the width direction of the flange plate of the inner chamber, the plurality of reinforcing plates equally divide the inner chamber into a plurality of sub-chambers, and the two long edges of the reinforcing plates are respectively welded to the inner flange plate and the outer flange plate of the inner chamber.

[0028] A high-strength steel combined multi-chamber box-shaped cross-section curved steel member includes a steel member body, the steel member body includes an inner chamber and an outer chamber, the inner chamber is welded to the inner side of the outer chamber, the inner chamber is subjected to a pre-tension stress, and the outer chamber is subjected to a pre-compression stress.

[0029] The present application has the beneficial effects:

[0030] 1. The stress level of each plate of the box-shaped cross-section curved steel member under axial compression is optimized, and the premature entry of the inner plate fiber into the yield state or the local buckling to cause the instability and damage of the member is avoided.

[0031] 2. The axial compression buckling ultimate load of the box section bending steel member is increased by more than 70% through the synergistic bearing of the double or multi-chamber section and the strengthening effect of high-strength steel.

[0032] 3. According to the stress characteristics of the bending steel member under the action of axial compression, by applying pre-tension stress to the inner side steel plate and pre-compression stress to the outer side steel plate during the manufacturing process of the steel member, the compression yielding state of the inner side steel plate under the action of axial compression is delayed, thereby increasing the axial compression buckling ultimate load of the box section bending steel member by more than 30%, and the axial compression buckling ultimate load of the box section bending steel member is increased by more than 100% through the synergistic bearing of the double or multi-chamber section and the strengthening effect of high-strength steel. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 The method flowchart of the present application is shown in the figure;

[0034] Figure 2 The manufacturing flowchart is shown in the figure;

[0035] Figure 3 The partition structure diagram of the bending steel member is shown in the figure;

[0036] Figure 4 The section view of the plastic reinforcement zone and the joint reinforcement zone is shown in the figure;

[0037] Figure 5 The section view of the non-reinforcement zone is shown in the figure;

[0038] Figure 6 The distribution section view of the reinforcement plate in the plastic reinforcement zone and the joint reinforcement zone is shown in the figure;

[0039] Figure 7 The distribution section view of the reinforcement plate in the non-reinforcement zone is shown in the figure;

[0040] Figure 8 The section view of the existing single box chamber bending steel member is shown in the figure;

[0041] Figure 9 The comparison curve diagram of the axial compression buckling ultimate load of the present application and the existing single box chamber is shown in the figure.

[0042] The figure shows that 1 is the outer chamber, 2 is the inner chamber, 3 is the plane web plate, 4 is the outer flange plate, 5 is the inner flange plate, 6 is the wedge-shaped steel plate, 7 is the spacer plate, 8 is the flat steel plate, 9 is the reinforcement plate, 10 is the sub-chamber, and 11 is the jack. DETAILED DESCRIPTION

[0043] The present application will be further described in detail below in combination with the embodiments and the drawings, but the embodiments of the present application are not limited thereto.

[0044] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "back", "top", "bottom" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the application is usually placed, and are only for the convenience of describing the application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0045] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "provided", "opened", "mounted", "connected", "connected" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0046] Embodiment 1

[0047] A manufacturing method of a high-strength steel combined multi-chamber box-shaped cross-section bending steel member, comprising the following steps:

[0048] S1: obtaining the design shape of the steel member to obtain the design eccentricity value of the steel member;

[0049] S2: preparing the outer chamber 1 of the steel member;

[0050] S3: applying a prestress to the outer chamber 1 along the axial direction of the outer chamber 1 to bend the outer chamber 1 to a first shape, and obtaining a first eccentricity value of the first shape, the first eccentricity value being greater than the design eccentricity value;

[0051] S4: applying a top pressure towards the bending inner side to a second shape to the first shape, the second shape being in a pre-tightening state, and obtaining a second eccentricity value of the second shape, the second eccentricity value being less than the design eccentricity value;

[0052] S5: the outer chamber 1 remains in the second shape, and the adapted inner chamber 2 is welded inside the outer chamber 1 to obtain the steel member, at this time, the steel member is in a third shape, and a third eccentricity value of the third shape is obtained, the third eccentricity value being equal to the second eccentricity value;

[0053] S6: gradually unloading the top pressure, after unloading, the inner chamber 2 is subjected to a pre-tension stress, and the outer chamber 1 is subjected to a pre-compression stress, to obtain the steel member with the design shape and the design eccentricity value.

[0054] Further, in S2, the first shape of the outer chamber 1 and the first eccentricity value in the first shape are obtained according to the prestress to be applied to the steel member in combination with finite element analysis, and the outer chamber 1 in the rectangular cross-section box shape is welded by using high-strength steel plates.

[0055] Further, in S4, the jacks 11 are used to apply jacking pressure to the outer chamber 1 towards the curved inner side, and the jacking displacement is performed to apply forced displacement.

[0056] Further, the jacking point position of the jacks 11 and the second shape and the second eccentricity value of the outer chamber 1 after the displacement are determined by using finite element simulation analysis, and the jacking stress is not higher than the yield strength of the high-strength steel.

[0057] Further, in S5, the shape of the inner chamber 2 steel plate is found, cut and processed by using finite element simulation, and the inner chamber 2 is welded while the outer chamber 1 is kept in the jacked state.

[0058] In the embodiment, as shown in Figure 1 and Figure 2 , the design shape of the steel member is a curved shape, which is represented by S0, and the maximum initial eccentricity of the middle part is a design eccentricity value, which is represented by v0, and the design eccentricity value is a length unit, which is generally L / 1000-L / 100, for example, if the length of the member is 5000, v0=5-500mm; the initial shape of the outer chamber 1 is obtained according to the prestress to be applied to the steel member in combination with finite element analysis, which is represented by S1, and the maximum initial eccentricity of the middle part is a first eccentricity value, which is represented by v1, and v1>v0; the tool is used to perform jacking displacement to the outer chamber 1 towards the curved inner side to apply forced displacement, and the jacking stress cannot exceed the yield strength of the steel, and the jacking is gradually performed within the yield strength of the steel, and the specific point position and the second shape after the displacement are determined by using finite element simulation analysis, and the second shape is represented by S2, and the maximum initial eccentricity of the middle part is a second eccentricity value, which is represented by v2, and v1>v0>v2; the shape of the inner chamber 2 steel plate is found, cut and processed by using finite element simulation; the inner chamber 2 steel plate is welded while the outer chamber 1 steel member is kept in the jacked state, and the steel member after the welding is in a third state S3, and the eccentricity value in the third state is represented by V3, and V3 is basically equal to V2. The jacking tools such as the jacks 11 are unloaded step by step, and the unloading scheme is determined by using finite element simulation, and the shape of the steel member after the unloading is the design curved shape S0, and the maximum initial eccentricity of the middle part is v0; at this time, the prestress beneficial to the stress of the steel structure is applied to the inside of the member, which is represented as: the curved inner side steel plate is prestressed, and the curved outer side steel plate is pre-stressed.

[0059] The asymmetric stress distribution under the axial compression is offset by the prestress application technology of pre-tensioning the inner steel plate and pre-pressing the outer steel plate, so that the axial compression buckling limit load of the component is increased by more than 30%, breaking through the limitation of traditional passive reinforcement. The closed-loop control process of the initial form S1 (v1>v0)→the top displacement form S2 (v2<v0)→the design form S0 after unloading is determined by finite element simulation, the top displacement is determined by finite element back analysis, and the unloading adopts a step-by-step grading strategy to avoid residual stress concentration and keep the inner room 2 welded under the condition that the outer room 1 is tightly pressed, so as to ensure the accurate formation of the prestress field. The three elements of multi-chamber section, high-strength steel and prestress are linked together, and the technical scheme of stress redistribution and load capacity jump is realized by the cooperation of the three elements.

[0060] Further, the width ratio of the inner room 2 to the outer room 1 is 0.2≤width ratio≤0.5.

[0061] Further, the inner flange plate 5 and the web plate of the inner room 2 are made of high-strength steel, the thickness of the inner flange plate 5 is greater than the thickness of the outer flange plate 4, the thickness of the inner flange plate 5 is Tn, the thickness of the outer flange plate 4 is Tw, the width of the inner flange plate 5 is Bn, and the width of the outer flange plate 4 is Bw, Tw≥Bw / 40, and Tn≥Bn / 16.

[0062] Further, the middle part of the formed steel component is a plastic strengthening area, both sides of the plastic strengthening area are non-strengthening areas, and the outside of the non-strengthening area is a node strengthening area; the web plate of the inner room 2 in the plastic strengthening area is made of a wedge-shaped steel plate 6; the web plate of the inner room 2 in the node strengthening area is made of a wedge-shaped steel plate 6; and the web plate of the inner room 2 in the non-strengthening area is made of a flat steel plate 8.

[0063] Further, a reinforcing plate 9 made of high-strength steel is welded along the axial direction of the steel component in the inner room 2; the reinforcing plate 9 is provided with multiple reinforcing plates 9 at equal intervals along the width direction of the flange plate of the inner room 2; the multiple reinforcing plates 9 divide the inner room 2 into multiple sub-chambers 10; and the two long edges of the reinforcing plate 9 are welded with the inner flange plate 5 and the outer flange plate 4 of the inner room 2 respectively.

[0064] Specifically, as shown in Figure 4 The traditional single-chamber box-shaped section is divided into an inner room 2 and an outer room 1, the width of the inner room 2 is h1, the width of the outer room 1 is h2, and the width ratio h1 / h2 of the two rooms is determined to be 0.2≤h1 / h2≤0.5 (preferably 0.3) through multi-objective optimization.

[0065] On the basis of the division of the double-chamber section, as shown in Figure 6 and Figure 7 The inner room 2 can be further divided into two or more chambers, which optimizes the stiffness distribution of the section, makes the stiffness center deviate to the stress concentration area (inner side), significantly improves the stress gradient distribution of the plate members of the inner and outer rooms 1, and avoids the premature buckling of the plate members of the inner room 2, as shown in Figure 9As shown, the overall shaft bearing capacity is increased by more than 70%. The present application adopts the reinforcing plate 9 as the reinforcing rib along the axial direction, compared with the transverse reinforcing rib of the prior art, the transverse reinforcing rib generally adopts the melting nozzle electroslag welding at least on one side, the heat input of welding is large, the welding residual stress is large, and the forming precision and stable bearing capacity of the steel member are affected, the present scheme does not have the transverse reinforcing rib, the residual stress is small, and the forming precision is high.

[0066] The inner side flange plate 5 and the web plate of the inner side chamber 2 adopt high-strength steel materials (Q420 and above grades), and the thickness gradient design (Tn≥Tw) is combined, so that the post-yield strength of the high-strength steel is fully utilized, the plastic zone expansion is delayed, and the material efficiency is maximized.

[0067] According to the axial compression stress characteristics of the steel member, the inner side steel plate first enters the plastic state, with the increase of the axial force, the plastic zone gradually develops to the outside, and then leads to the instability failure of the member, the present application mainly considers that the stiffness center of the section is deviated to the inside through the design of multiple chambers, the stress level of the inner and outer side steel plates is improved, and then the overall stability of the member under compression is enhanced, through the finite element verification, after the multiple chambers are set, the steel consumption of the member is increased by 6.1%, but the axial compression buckling limit load is increased by 100.4%.

[0068] The inner side flange and the web plate of the inner side chamber 2 adopt high-strength steel, and the steel grade is Q420, Q460, Q500, Q550, Q620, Q690 or higher grade steel such as Q890, Q960 and Q1100.

[0069] The thickness of the inner side flange plate 5 is greater than the thickness of the outer side flange plate 4, the thickness of the inner side flange plate 5 is Tn, the thickness of the outer side flange plate 4 is Tw, the width of the inner side flange plate 5 is Bn, and the width of the outer side flange plate 4 is Bw, in order to ensure that the plate does not occur local buckling, Tw≥Bw / 40, and Tn≥Bn / 16.

[0070] As shown in Figure 3 As shown in the figure, the inner side steel plate of the maximum section deviated from the axial force center line is the first to enter the plastic state under the action of axial compression, in order to fully utilize the post-yield strength of the steel plate, and avoid the plastic state from developing to the outside too fast to improve the stability limit bearing capacity of the member, this section can be called a plastic strengthening zone, the length of the section is L*20% (and≥2h), as shown in Figure 4 As shown in the figure, the web plate of the inner side chamber 2 in this section adopts a wedge-shaped steel plate 6; the end of the steel member close to the joint area can be called a joint strengthening zone, the length of the section is L*15% (and≥1.5h), and the web plate of the inner side chamber 2 in this section also adopts a wedge-shaped steel plate 6; as shown in Figure 5 As shown in the figure, other areas except the plastic strengthening zone and the joint strengthening zone can be called a non-strengthening zone, the web plate of the inner side chamber 2 in this section adopts a flat steel plate 8, the wedge-shaped plate avoids stress concentration, and the inclined surfaces of the wedge-shaped plates are arranged oppositely.

[0071] Embodiment 2

[0072] A high-strength steel combined multi-chamber box section bending steel member, comprising a steel member body, the steel member body comprising an inner chamber 2 and an outer chamber 1, the inner chamber 2 being welded to the inner side of the outer chamber 1, the inner chamber 2 being subjected to a pre-tension stress, the outer chamber 1 being subjected to a pre-compression stress, the outer chamber 1 being welded by multiple steel plates, the outer chamber 1 having a rectangular cross section, the inner chamber 2 being composed of flange plates and webs, the webs being wedge-shaped plates, one end of the wedge-shaped plates being welded to both sides of the outer chamber 1, the other end being welded to the inner side flange plate of the inner chamber, the inner chamber 2 having a rectangular cross section, the inner cavity of the inner chamber 2 being divided into multiple uniform sub-chambers 10 by multiple reinforcing plates 9.

[0073] In the embodiment, as shown in the figure, the outer chamber 1 is composed of two flange plates and two plane webs 3 to form a rectangular box chamber, the outer side flange plate 4 of the inner chamber 2 is the same plate as the flange plate on the inner side of the outer chamber 1, and the two plane webs 3 of the outer chamber 1 are respectively welded to the web end of the inner chamber 2, as shown in the figure, the web of the plastic reinforcement zone and the joint reinforcement zone of the inner chamber 2 is a wedge-shaped steel plate 6, as shown in the figure, the web of the non-reinforcement zone is a plane steel plate 8, there is a backing plate 7 on the inner side of the welding position, the two ends of the reinforcing plate 9 are respectively welded to the inner side of the inner flange plate 5 and the inner side of the outer flange plate 4, and there is a backing plate 7 on the inner side of the welding position. Figure 4 Figure 6 Figure 7 By dividing the traditional single-chamber box section into double-chamber or multi-chamber, the cross section stiffness distribution is optimized, the stiffness center is deviated to the stress concentration zone, the stress gradient distribution of the inner and outer plate members is significantly improved, the inner plate member is prevented from buckling too early, high-strength steel is used for the inner flange and web, combined with thickness gradient design, the post-yield strength of high-strength steel is fully utilized, the plastic zone expansion is delayed, the material efficiency is maximized, the pre-stress application technology of pre-tensioning the inner plate and pre-compressing the outer plate offsets the asymmetric stress distribution under axial compression, the axial compression buckling limit load of the member is improved, and the limitation of traditional passive reinforcement is broken. The multi-chamber section division combined with the wedge-shaped web (plastic reinforcement zone and joint reinforcement zone) design effectively suppresses the out-of-plane deformation of the curved plate, and the local stability bearing capacity is improved by 40%-50%. Through the wedge-shaped steel plate 6 design of the plastic reinforcement zone (20% of the member length), the plastic hinge is formed in the controllable area, the ductility and seismic performance of the member are improved, the pre-stress application and form control based on finite element simulation ensure the manufacturing precision, reduce the on-site shaping process, and shorten the construction period by more than 30%.

[0074] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. According to the technical essence of the present application, any simple modification, equivalent replacement and improvement of the above embodiment within the spirit and principles of the present application are still within the protection scope of the technical scheme of the present application.​​

Claims

1. A method for manufacturing a high-strength steel composite multi-cell box-section bending steel member, characterized in that, Includes the following steps: S1: Obtain the design shape of the steel component and the design eccentricity value of the steel component; S2: Prepare the outer chamber (1) of the steel component; S3: Apply prestress to the outer chamber (1) along the axial direction of the outer chamber (1) to make the outer chamber (1) bend to the first shape and obtain the first eccentricity value of the first shape, which is greater than the design eccentricity value. S4: Apply top pressure toward the inside of the bend to the second form in the first form. The second form is in a pre-tightened state, and a second eccentricity value of the second form is obtained. The second eccentricity value is less than the design eccentricity value. S5: The outer chamber (1) maintains the second form. The inner chamber (2) is welded to the inner side of the outer chamber (1) to obtain a steel component. At this time, the steel component is in the third form and obtains the third eccentricity value of the third form. The third eccentricity value is equal to the second eccentricity value. Finite element simulation is used to find the shape, cut and process the steel plate of the inner chamber (2). While keeping the outer chamber (1) in a tight state, the inner chamber (2) is welded. The width ratio of the inner chamber (2) to the outer chamber (1) is 0.2≤width ratio≤0.

5. The inner flange plate (5) and web of the inner chamber (2) are made of high-strength steel. The thickness of the inner flange plate (5) is greater than that of the outer flange plate. (4) Thickness, the thickness of the inner flange plate (5) is Tn, the thickness of the outer flange plate (4) is Tw, the width of the inner flange plate (5) is Bn, the width of the outer flange plate (4) is Bw, Tw≥Bw / 40, Tn≥Bn / 16; a high-strength steel reinforcing plate (9) is welded along the axial direction of the steel component inside the inner chamber (2). Multiple reinforcing plates (9) are evenly spaced along the width direction of the flange plate of the inner chamber (2). The multiple reinforcing plates (9) divide the inner chamber (2) into multiple sub-chambers (10). The two long sides of the reinforcing plate (9) are welded to the inner flange plate (5) and the outer flange plate (4) of the inner chamber (2) respectively. S6: Gradually unload the top pressure. After unloading, the inner chamber (2) is subjected to pre-tension stress, and the outer chamber (1) is subjected to pre-compression stress. The steel components with the design shape and design eccentricity value are obtained.

2. The manufacturing method of a high-strength steel composite multi-cell box-section bending steel member according to claim 1, characterized in that, In S2, the first shape of the outer chamber (1) and the first eccentricity value under the first shape are obtained by combining the prestress to be applied to the steel component with finite element analysis. High-strength steel plates are used to weld a box-shaped outer chamber (1) with a rectangular cross section.

3. The manufacturing method of a high-strength steel composite multi-cell box-section bending steel member according to claim 1, characterized in that, In S4, a jack (11) is used to apply a jacking pressure to the outer chamber (1) towards the inside of the bend, and to perform a jacking movement to apply a forced displacement.

4. The manufacturing method of a high-strength steel composite multi-cell box-section bending steel member according to claim 3, characterized in that, The top pressure point of the jack (11) and the second shape and second eccentricity value after the outer chamber (1) are offset are determined by finite element simulation analysis. The top pressure stress is not higher than the yield strength of high-strength steel.

5. A high-strength steel composite multi-cell box-section bending steel member obtained by the manufacturing method of a high-strength steel composite multi-cell box-section bending steel member according to any one of claims 1-4, characterized in that, The steel component body includes an inner chamber (2) and an outer chamber (1). The inner chamber (2) is welded to the inner side of the outer chamber (1). The inner chamber (2) is subjected to pre-tension stress, and the outer chamber (1) is subjected to pre-compression stress. The outer chamber (1) is welded from multiple steel plates. The cross-section of the outer chamber (1) is rectangular. The inner chamber (2) is composed of a flange plate and a web plate. The web plate is a wedge plate. One end of the wedge plate is welded to the end of the web plate of the outer chamber (1), and the other end is welded to the inner flange plate of the inner chamber. The cross-section of the inner chamber (2) is rectangular. The inner cavity of the inner chamber (2) is divided into multiple uniform sub-cavities (10) by multiple reinforcing plates (9).

6. A high-strength steel composite multi-cell box-section bending steel member according to claim 5, characterized in that, The middle part of the steel component body is a plastic reinforcement zone, the two sides of the plastic reinforcement zone are non-reinforced zones, the outer side of the non-reinforced zone is a node reinforcement zone, the web of the inner chamber (2) in the plastic reinforcement zone is made of wedge-shaped steel plate (6); the web of the inner chamber (2) in the node reinforcement zone is made of wedge-shaped steel plate (6); the web of the inner chamber (2) in the non-reinforced zone is made of flat steel plate (8).

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