Steel component assembly with fatigue resistance and processing method

Abstract

The present invention discloses a steel component assembly with anti-fatigue characteristics and a processing method, wherein the steel component assembly includes a steel component body and a fiber anti-fatigue sticker, the steel component body has a part bearing fatigue load; the fiber anti-fatigue sticker is adhesively arranged at the part bearing fatigue load; the fiber anti-fatigue sticker is used to perform fatigue reinforcement on the part bearing fatigue load on the steel component body, when the steel component body is subjected to stress, the stress of the part bearing fatigue load on the steel component body is concentrated, the fiber anti-fatigue sticker is adhesively arranged at the part bearing fatigue load, the stress concentration of the part bearing fatigue load is reduced, the occurrence of fatigue cracks can be prevented or slowed down, and the fatigue life of the steel component is improved. The present invention has good anti-fatigue performance, simple and convenient construction, and strong engineering practicality.

Description

Technical Field

[0001] The invention relates to the technical field of steel structure, and in particular to a steel component assembly with fatigue resistance and a processing method thereof. Background Art

[0002] Surveys show that for steel structures, 80% to 90% of damage is related to fatigue fracture. "Fatigue failure" was first proposed in the 1840s to describe the destructive behavior of railway vehicle axles under repeated loads. Later, with the widespread application of steel structures, fatigue failure spread to various fields such as machinery, aviation, railways, and civil engineering, causing serious consequences. Historically, cases of huge losses caused by fatigue failure in civil engineering are not uncommon. It is for this reason that the fatigue problem of steel structures has received more and more attention from scholars.

[0003] For in-service steel structures, components that have cracked are difficult to replace or rebuild, so fatigue reinforcement is required. Traditional reinforcement methods include welded steel plate reinforcement, bolted connection reinforcement, etc. These methods have the following problems: increase in structural size and weight; change in stiffness, resulting in stress redistribution; difficult and dangerous construction; stress concentration caused by welding; initial defects caused by bolts, etc. However, fatigue reinforcement using carbon fiber composites or glass fiber composites can avoid these problems. Its fatigue reinforcement of steel structures has great advantages.

[0004] At present, the effectiveness and practicality of using fiber composite materials for reinforcement have also been confirmed in actual projects. MCC General Research Institute of Building and Construction Co., Ltd. used carbon fiber composite materials to fatigue reinforce 24 heavy crane beams in the smelting workshop of Shanghai Baosteel. The curing was completed within 2 hours, and the fatigue life was finally increased by 20%-50%. However, there is no mature research on the use of fiber composite materials as anti-fatigue stickers in new steel structures. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a steel component assembly with fatigue resistance, which has good fatigue resistance, is simple and convenient to construct, and has strong engineering practicality.

[0006] A steel component assembly with anti-fatigue properties according to an embodiment of the first aspect of the present invention comprises:

[0007] A steel component body, wherein the steel component body has a portion bearing fatigue load;

[0008] A fiber anti-fatigue patch is adhesively arranged at the position bearing the fatigue load.

[0009] According to the steel component assembly with anti-fatigue characteristics of the embodiment of the first aspect of the present invention, the fiber anti-fatigue paste is used to perform fatigue reinforcement on the part of the steel component body that bears the fatigue load, thereby reducing the stress concentration of the part that bears the fatigue load, preventing or slowing down the occurrence of fatigue cracks, and improving the fatigue life of the steel component assembly. In summary, the steel component assembly with anti-fatigue characteristics of the embodiment of the first aspect of the present invention has good anti-fatigue performance, is simple and convenient to construct, and has strong engineering practicality.

[0010] According to an embodiment of the first aspect of the present invention, the portion bearing the fatigue load has no cracks or has cracks.

[0011] According to a further embodiment of the first aspect of the present invention, the fiber anti-fatigue patch is a carbon fiber anti-fatigue patch or a glass fiber anti-fatigue patch.

[0012] According to some embodiments of the first aspect of the present invention, the fiber anti-fatigue patch is a fiber anti-fatigue cloth.

[0013] According to a further embodiment of the first aspect of the present invention, there are a plurality of the anti-fatigue fiber cloths, the plurality of the anti-fatigue fiber cloths are stacked and two adjacent anti-fatigue fiber cloths are fixed by adhesive.

[0014] According to some embodiments of the first aspect of the present invention, the fiber anti-fatigue patch is a fiber anti-fatigue board.

[0015] The second aspect of the present invention further proposes a method for processing a steel component assembly with anti-fatigue properties as described in any one of the embodiments of the first aspect.

[0016] The method for processing the steel component assembly with anti-fatigue properties according to the second aspect of the present invention comprises the following steps:

[0017] S1: performing surface treatment on the fatigue load-bearing portion of the steel component body by using a sandblasting method;

[0018] S2: The fiber anti-fatigue patch is pasted on the surface-treated part bearing the fatigue load by using an adhesive.

[0019] According to an embodiment of the second aspect of the present invention, in step S2, specifically:

[0020] If the fiber anti-fatigue sticker is the fiber anti-fatigue cloth, first use a brush to apply a layer of adhesive on the surface-treated part bearing the fatigue load, and when it is dry to the touch, apply another layer of adhesive; then, attach the first layer of the fiber anti-fatigue cloth; then, after applying a layer of adhesive on the surface of the first layer of the fiber anti-fatigue cloth, attach the second layer of the fiber anti-fatigue cloth on the surface of the first layer of the fiber anti-fatigue cloth, and so on;

[0021] If the fiber anti-fatigue sticker is the fiber anti-fatigue board, first use a brush to apply a layer of adhesive on the surface-treated part bearing the fatigue load, and when it is dry to the touch, apply another layer of adhesive; then, attach the fiber anti-fatigue board.

[0022] According to some embodiments of the second aspect of the present invention, after step S2, the following steps are further included:

[0023] S3: Squeeze out excess adhesive between the steel component body and the fiber anti-fatigue cloth and between the fiber anti-fatigue cloth layers, or between the steel component body and the fiber anti-fatigue plate, and remove bubbles in the adhesive, so that the adhesive is evenly distributed;

[0024] S4: After the adhesive is cured, remove the release cloth or vacuum bag.

[0025] According to a further embodiment of the second aspect of the present invention, step S3 specifically comprises: covering the demoulding cloth or the vacuum bag on the last layer of the fiber anti-fatigue cloth or the fiber anti-fatigue board, and then rolling the demoulding cloth or the vacuum bag with a roller to squeeze out excess adhesive between the steel component body and the fiber anti-fatigue cloth and between the fiber anti-fatigue cloth layers, or between the steel component body and the fiber anti-fatigue board, and removing bubbles in the adhesive, so that the adhesive is evenly distributed.

[0026] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0028] Figure 1 This is a schematic diagram of stress distribution before fiber anti-fatigue bonding on the surface of a crack-free steel component in one embodiment of the present invention.

[0029] Figure 2 This is a schematic diagram of stress distribution after fiber anti-fatigue bonding on the surface of a crack-free steel component in one embodiment of the present invention.

[0030] Figure 3 This is a schematic diagram of stress distribution before fiber anti-fatigue bonding on the surface of a cracked steel component in another embodiment of the present invention.

[0031] Figure 4 This is a schematic diagram of stress distribution after fiber anti-fatigue bonding is applied to the surface of a cracked steel component in another embodiment of the present invention.

[0032] Figure 5 This is a schematic diagram of a steel component assembly of a steel truss bridge in another embodiment of the present invention, in which the steel component body is a steel truss bridge.

[0033] Figure 6 for Figure 5 Schematic diagram of the cross section of the tension truss rod at A.

[0034] Figure 7 This is a schematic diagram of a steel component assembly in which the steel component body is a steel beam in yet another embodiment of the present invention.

[0035] Figure 8 This is a schematic diagram of a steel component assembly in which the steel component body is an orthotropic bridge deck in another embodiment of the present invention.

[0036] Reference numerals:

[0037] Steel component assembly 1000

[0038] Steel component body 1 Part bearing fatigue load 11

[0039] Fiber anti-fatigue stickers 2 Truss beams 3 Crane beams 4 Orthotropic steel panels 5 DETAILED DESCRIPTION

[0040] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0041] Combine the following Figures 1 to 8 A steel component assembly 1000 with anti-fatigue characteristics according to an embodiment of the first aspect of the present invention is described.

[0042] like Figures 5 to 8 As shown, a steel component assembly 1000 with anti-fatigue properties according to an embodiment of the first aspect of the present invention includes a steel component body 1 and a fiber anti-fatigue patch 2, wherein the steel component body 1 has a portion 11 that bears fatigue loads; the fiber anti-fatigue patch 2 is adhesively arranged at the portion 11 that bears fatigue loads.

[0043] Specifically, the steel component body 1 has a portion 11 that bears fatigue loads, that is, the steel component body 1 has a portion where stress concentration is likely to cause fatigue cracks. Figures 5 to 8 In the figure, the main body 1 of the steel component is a truss beam 3, a crane beam 4 and an orthotropic steel panel 5, and the parts 11 bearing fatigue loads are the lower flange of the truss beam 3, the lower flange and weld of the crane beam 4, and the longitudinal ribs and top plate weld of the orthotropic steel panel 5. These parts are stress concentrated and prone to fatigue cracks.

[0044] The fiber anti-fatigue sticker 2 is glued and arranged at the part 11 bearing the fatigue load. The fiber anti-fatigue sticker 2 is used to perform fatigue reinforcement on the part 11 bearing the fatigue load on the steel component body 1, thereby reducing the stress concentration at the part 11 bearing the fatigue load, preventing or slowing down the occurrence of fatigue cracks, and improving the fatigue life of the steel component assembly. Figures 5 to 8 In the figure, the steel component body 1 is a truss beam 3, a crane beam 4 and an orthotropic steel panel 5. The fiber anti-fatigue sticker 2 is glued and arranged at the position 11 bearing fatigue load, such as the lower flange of the truss beam 3, the lower flange and weld of the crane beam 4 and the longitudinal rib and top plate weld of the orthotropic steel panel 5, which reduces the stress concentration at the position 11 bearing fatigue load, prevents or slows down the occurrence of fatigue cracks, and improves the fatigue life of the steel component assembly.

[0045] According to the steel component assembly 1000 with anti-fatigue characteristics of the embodiment of the first aspect of the present invention, the fiber anti-fatigue sticker 2 is used to perform fatigue reinforcement on the part 11 of the steel component body 1 that bears the fatigue load, thereby reducing the stress concentration of the part 11 that bears the fatigue load, preventing or slowing down the occurrence of fatigue cracks, and improving the fatigue life of the steel component assembly. In summary, the steel component assembly 1000 with anti-fatigue characteristics of the embodiment of the first aspect of the present invention has good anti-fatigue performance, is simple and convenient to construct, and has strong engineering practicality.

[0046] According to an embodiment of the first aspect of the present invention, the fatigue load-bearing portion 11 is crack-free or crack-bearing. Figure 1 to Figure 2 As shown, the fiber anti-fatigue sticker 2 is glued and set on the crack-free fatigue load-bearing part 11 for fatigue resistance enhancement. During the stress process, the fiber anti-fatigue sticker 2 deforms together with the fatigue load-bearing part 11 through the adhesive, sharing the tensile stress on the cross section of the fatigue load-bearing part 11, thereby reducing the stress of the fatigue load-bearing part 11 of the steel component body 1. Figure 3 to Figure 4 As shown, the fiber anti-fatigue patch 2 is glued to the cracked part 11 that bears fatigue load for fatigue enhancement. During the stress process, the fiber anti-fatigue patch 2 reduces the stress intensity factor at the crack tip of the part 11 that bears fatigue load. The fiber anti-fatigue patch 2 deforms together with the part 11 that bears fatigue load through the adhesive, sharing the tensile stress in the cross section of the part 11 that bears fatigue load, especially near the crack tip, thereby reducing the stress intensity factor at the crack and delaying the development of the crack.

[0047] According to a further embodiment of the first aspect of the present invention, the fiber anti-fatigue sticker 2 is a carbon fiber anti-fatigue sticker 2 or a glass fiber anti-fatigue sticker 2. It is understandable that the carbon fiber anti-fatigue sticker 2 or the glass fiber anti-fatigue sticker 2 has a low relative density, so the material weight is low and will not increase the weight of the steel component body 1; the carbon fiber anti-fatigue sticker 2 or the glass fiber anti-fatigue sticker 2 is directly glued and set at the part 11 that bears the fatigue load, which is convenient for construction, does not cause damage to the steel component body 1, and is not affected by welding; the carbon fiber anti-fatigue sticker 2 or the glass fiber anti-fatigue sticker 2 has high strength and high modulus, maintains elasticity within its own high-strength range, has no fatigue problem within the stress amplitude of the steel structure, has good fatigue performance and can be applied to flexible reinforcement such as curved surface reinforcement; the carbon fiber anti-fatigue sticker 2 or the glass fiber anti-fatigue sticker 2 has good corrosion resistance and can be used for a long time in acidic and alkaline environments.

[0048] According to some embodiments of the first aspect of the present invention, the fiber anti-fatigue patch 2 is a fiber anti-fatigue cloth. It can be understood that when the fiber anti-fatigue cloth is used to perform fatigue reinforcement on the fatigue load-bearing portion 11 of the steel component body 1, the fiber anti-fatigue cloth can improve the fatigue resistance of the fatigue load-bearing portion 11 on the steel component body 1 and the construction is convenient and quick.

[0049] According to a further embodiment of the first aspect of the present invention, there are multiple fiber anti-fatigue cloths, and the multiple fiber anti-fatigue cloths are stacked and fixed to each other by adhesive. Thus, the multiple fiber anti-fatigue cloths are stacked and glued to the fatigue load-bearing part 11 of the steel component body 1, which can better enhance the anti-fatigue performance of the fatigue load-bearing part 11 of the steel component body 1.

[0050] According to some embodiments of the first aspect of the present invention, the fiber anti-fatigue sticker 2 is a fiber anti-fatigue board. It can be understood that when the fiber anti-fatigue board performs fatigue reinforcement on the fatigue load-bearing portion 11 of the steel component body 1, the fiber anti-fatigue board can improve the fatigue resistance of the fatigue load-bearing portion 11 on the steel component body 1 and the construction is convenient and quick.

[0051] The second aspect of the present invention further proposes a method for processing a steel component assembly 1000 having anti-fatigue properties as described in any one of the embodiments of the first aspect.

[0052] The method for processing the steel component assembly 1000 with anti-fatigue properties according to the embodiment of the second aspect of the present invention comprises the following steps:

[0053] S1: The part 11 of the steel component body 1 that bears fatigue load is surface treated by sandblasting; thereby, the surface cleanliness, roughness and fatigue resistance of the part 11 that bears fatigue load are improved, and the adhesion between the surface of the part 11 that bears fatigue load and the adhesive is increased.

[0054] S2: The fiber anti-fatigue sticker 2 is pasted on the fatigue load-bearing part 11 that has been surface treated using an adhesive, which can improve the anti-fatigue performance of the fatigue load-bearing part 11 on the steel component body 1 and is convenient and quick to construct.

[0055] According to the processing method of the second aspect of the present invention, the fiber anti-fatigue sticker 2 is used to perform fatigue reinforcement on the part 11 of the steel component body 1 that bears the fatigue load, thereby reducing the stress concentration of the part 11 that bears the fatigue load, preventing or slowing down the occurrence of fatigue cracks, and improving the fatigue life of the steel component. In summary, according to the processing method of the embodiment of the second aspect of the present invention, the steel component assembly 1000 has good fatigue resistance, simple and convenient construction, and strong engineering practicality.

[0056] According to an embodiment of the second aspect of the present invention, in step S2, specifically:

[0057] If the fiber anti-fatigue patch 2 is a fiber anti-fatigue cloth, first use a brush to apply a layer of adhesive on the fatigue load-bearing part 11 that has been surface-treated, and apply another layer of adhesive when it is dry to the touch; then, apply the first layer of fiber anti-fatigue cloth; then, apply a layer of adhesive on the surface of the first layer of fiber anti-fatigue cloth, and then apply the second layer of fiber anti-fatigue cloth on the surface of the first layer of fiber anti-fatigue cloth, and so on. It can be understood that applying a layer of adhesive on the fatigue load-bearing part 11 that has been surface-treated makes the surface of the fatigue load-bearing part 11 smooth, and the fiber anti-fatigue cloth does not directly contact the rough surface of the fatigue load-bearing part 11, thereby avoiding electrochemical corrosion of the fiber anti-fatigue cloth; applying another layer of adhesive when it is dry to the touch makes the fatigue load-bearing part 11 and the fiber anti-fatigue cloth firmly adhered.

[0058] If the fiber anti-fatigue sticker 2 is a fiber anti-fatigue board, first use a brush to apply a layer of adhesive to the fatigue load-bearing part 11 that has been surface-treated, and apply another layer of adhesive when it is dry to the touch; then, attach the fiber anti-fatigue board. It can be understood that applying a layer of adhesive to the fatigue load-bearing part 11 that has been surface-treated makes the surface of the fatigue load-bearing part 11 smooth, and the fiber anti-fatigue board does not directly contact the rough surface of the fatigue load-bearing part, thereby avoiding electrochemical corrosion of the fiber anti-fatigue board; applying another layer of adhesive when it is dry to the touch makes the fatigue load-bearing part 11 and the fiber anti-fatigue board firmly adhered.

[0059] According to some embodiments of the second aspect of the present invention, after step S2, the following steps are further included:

[0060] S3: Extruding excess adhesive between the steel component body 1 and the fiber anti-fatigue cloth and between the fiber anti-fatigue cloth layers, or between the steel component body 1 and the fiber anti-fatigue plate, and removing bubbles in the adhesive, so that the adhesive is evenly distributed;

[0061] S4: After the adhesive is cured, remove the release cloth or vacuum bag.

[0062] Specifically, after the steel component body 1 and the fiber anti-fatigue sticker 2 are pasted, the excess adhesive between the steel component body 1 and the fiber anti-fatigue cloth and between the fiber anti-fatigue cloth layers, or between the steel component body 1 and the fiber anti-fatigue board is squeezed out and the bubbles in the adhesive are removed, so that the adhesive is evenly distributed, thereby enhancing the adhesion between the steel component body 1 and the fiber anti-fatigue cloth and between the fiber anti-fatigue cloth layers, or between the steel component body 1 and the fiber anti-fatigue board.

[0063] After the adhesive is cured, remove the release cloth or vacuum bag. It can be understood that the release cloth or vacuum bag has the function of anti-sticking and anti-demolding. After the adhesive is fully cured in the air, the fiber anti-fatigue sticker 2 completes the fatigue reinforcement of the part 11 on the steel component body 1 that bears the fatigue load.

[0064] According to a further embodiment of the second aspect of the present invention, step S3 is specifically: covering the last layer of fiber anti-fatigue cloth or fiber anti-fatigue board with a demolding cloth or a vacuum bag, and then rolling the demolding cloth or the vacuum bag with a roller. The demolding cloth or the vacuum bag has the function of anti-sticking and anti-demolding, so as to squeeze out the excess adhesive between the steel component body 1 and the fiber anti-fatigue cloth and between the fiber anti-fatigue cloth layers, or between the steel component body 1 and the fiber anti-fatigue board, and remove the bubbles in the adhesive, so that the adhesive is evenly distributed, and the adhesion between the steel component body 1 and the fiber anti-fatigue cloth and between the fiber anti-fatigue cloth layers, or between the steel component body 1 and the fiber anti-fatigue board is enhanced.

[0065] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0066] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A method for processing a steel component assembly having anti-fatigue properties, characterized in that: The steps include: S1: using a sandblasting method to perform surface treatment on the fatigue load-bearing portion of the steel component body, wherein the fatigue load-bearing portion has no cracks; S2: using an adhesive to stick the fiber anti-fatigue sticker on the surface-treated part that bears the fatigue load; In step S2, specifically: If the fiber anti-fatigue sticker is a fiber anti-fatigue cloth, first use a brush to apply a layer of adhesive on the surface-treated part bearing the fatigue load, and when it is dry to the touch, apply another layer of adhesive; then, apply the first layer of the fiber anti-fatigue cloth, and the fiber anti-fatigue cloth is not in direct contact with the rough surface of the part bearing the fatigue load; then, after applying a layer of adhesive on the surface of the first layer of the fiber anti-fatigue cloth, the second layer of the fiber anti-fatigue cloth is attached to the surface of the first layer of the fiber anti-fatigue cloth, and so on; If the fiber anti-fatigue sticker is a fiber anti-fatigue board, first use a brush to apply a layer of adhesive on the surface-treated part bearing the fatigue load, and when it is dry to the touch, apply another layer of adhesive; then, attach the fiber anti-fatigue board.

2. The processing method according to claim 1, characterized in that: After step S2, the method further includes the following steps: S3: Squeeze out excess adhesive between the steel component body and the fiber anti-fatigue cloth and between the fiber anti-fatigue cloth layers, or between the steel component body and the fiber anti-fatigue plate, and remove bubbles in the adhesive, so that the adhesive is evenly distributed; S4: After the adhesive is cured, remove the release cloth or vacuum bag.

3. The processing method according to claim 2, characterized in that: The step S3 specifically comprises: covering the demoulding cloth or the vacuum bag on the last layer of the fiber anti-fatigue cloth or the fiber anti-fatigue board, and then rolling the demoulding cloth or the vacuum bag with a roller to squeeze out the excess adhesive between the steel component body and the fiber anti-fatigue cloth and between the fiber anti-fatigue cloth layers, or between the steel component body and the fiber anti-fatigue board, and removing bubbles in the adhesive, so that the adhesive is evenly distributed.

4. A method for processing a steel component assembly with anti-fatigue properties as claimed in any one of claims 1 to 3, wherein the steel component assembly with anti-fatigue properties is processed by: include: A steel component body, wherein the steel component body has a portion bearing fatigue load; The part bearing the fatigue load has no cracks; A fiber anti-fatigue patch is adhesively arranged at the position bearing the fatigue load.

5. The steel component assembly with anti-fatigue properties according to claim 4, characterized in that: The fiber anti-fatigue patch is a carbon fiber anti-fatigue patch or a glass fiber anti-fatigue patch.

6. The steel component assembly with anti-fatigue properties according to any one of claims 4, characterized in that: The fiber anti-fatigue patch is a fiber anti-fatigue cloth.

7. The steel component assembly with anti-fatigue properties according to claim 6, characterized in that: There are a plurality of the fiber anti-fatigue cloths, and the plurality of the fiber anti-fatigue cloths are stacked and two adjacent fiber anti-fatigue cloths are fixed by adhesive.

8. The steel component assembly with anti-fatigue properties according to any one of claims 4 to 5, characterized in that: The fiber anti-fatigue patch is a fiber anti-fatigue board.

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