JP6552837B2 - Method for reinforcing steel structure and laminated material for reinforcing steel structure - Google Patents

Description

  The present invention uses a reinforcing fiber-containing material containing continuous reinforcing fibers to repair and reinforce (hereinafter simply referred to as “reinforcement”) a steel structure such as a bridge, a building or a machine. And, it relates to a laminated material for reinforcing a steel structure.

  Conventionally, a method of reducing the degree of stress of existing steel materials by welding steel plates to the surface of steel materials to be reinforced or welding them with high-strength bolts has been implemented. However, this method requires welding and drilling, and the weight of the reinforcing steel plate is large, so that the construction becomes large, and there is a possibility of structural weaknesses such as residual stress due to welding and cross-sectional defects due to drilling.

  Therefore, in recent years, a method of bonding the reinforcing fiber-containing material to the steel surface of the structure to be reinforced with an adhesive and reducing the stress level of the existing steel has been proposed because welding and drilling are unnecessary and construction is simple. (See, for example, Patent Document 1).

  As described above, the reinforcing method of bonding the reinforcing fiber-containing material to the steel structure with an adhesive is advantageous because the material is lightweight, so that handling at the time of application is easy, and it can be reinforced only by bonding. It is mentioned that special processing such as providing bolt holes in steel is not necessary.

  However, when a carbon fiber reinforced resin plate (hereinafter referred to as "CFRP plate") obtained by impregnating a carbon fiber with a resin and curing is used as the reinforcing fiber containing material, for example, this CFRP plate has a linear expansion coefficient Since it is approximately 0 μ / ° C., an internal stress (that is, a thermal stress) is generated in the steel to which the CFRP plate is bonded when it receives a temperature change. Since a CFRP plate is adhered as a reinforcement method for reducing the stress generated in the steel material, it is not preferable that a thermal stress is generated in the steel material due to a temperature change.

  As shown in FIGS. 13 (a) and 13 (b) attached to this application, Patent Document 2 has an aluminum alloy plate (hereinafter, referred to as “a steel sheet 200”) having a linear expansion coefficient larger than that of the steel member 200. "AL plate") 10 is laminated to the steel member 200 together with the CFRP plate 1, and the thermal stress generated in the steel member 200 due to temperature change, and the steel member 200 and the reinforcing material (CFRP plate + AL plate) A method of reinforcing a steel structure is described which reduces the thermal stresses that occur at the adhesive interface with 100.

JP 2003-193425 A JP 2012-255303 A

  That is, as shown in FIGS. 13A and 13B, for example, when a laminated plate (that is, a reinforcing plate) 100 composed of the CFRP plate 1 and the AL plate 10 is bonded to one surface of the steel member 200, The CFRP plate 1 and AL relative to the steel member 200 are small when the rigidity is small and the distances dν1 and d 図 2 from the center of the composite member to the center of the CFRP plate 1 and the AL plate 10 are short. The difference in the relative elongation of the plate 10 and the difference in the distance between the centroids cause a bending moment Mv on the composite member.

  Therefore, in order to make the bending moment Mv be zero (Mv = 0), the CFRP plate 1 is made to match the linear expansion coefficient of the laminated plate 100 consisting of the CFRP plate 1 and the AL plate 10 with the linear expansion coefficient of the steel member 200. The thermal stress generated in the steel member 200 can be reduced by designing the AL plate 10.

  As described above, the steel structure reinforcing method described in Patent Document 2 has a structure in which a CFRP plate and an AL plate are stacked on the surface of a steel member, but the present inventors have conducted many research experiments. As a result, it has been found that the thermal stress generated in the steel sheet due to a temperature change can be reduced by alternately arranging CFRP plates and AL plates adjacent to each other on the surface of the steel member.

  The present invention is based on such novel findings of the present inventors.

  An object of the present invention is to provide a steel structure reinforcing method in which a reinforcing material is bonded to the surface of a steel member constituting the steel structure with an adhesive, and the thermal stress generated in the steel material due to a temperature change is reduced to achieve a sufficient reinforcing effect. It is an object of the present invention to provide a method of reinforcing a steel structure and a laminate for reinforcing a steel structure, by which the steel structure can be obtained.

The above object is achieved by the method for reinforcing a steel structure according to the present invention and a laminate for reinforcing a steel structure. In summary, according to the first aspect of the present invention, in the method for reinforcing a steel structure, the reinforcing material is bonded to the surface of the steel material constituting the steel structure with an adhesive.
The reinforcing material is composed of a reinforcing fiber-containing material having a smaller linear expansion coefficient than the steel material constituting the steel structure, and an alloy material having a larger linear expansion coefficient than the steel material,
On the surface of the steel material, the reinforcing fiber-containing material and the alloy material are alternately arranged in the lateral direction along the surface of the steel material and bonded with an adhesive, and the thermal stress generated in the steel material due to the temperature change of the steel material. There is provided a method for reinforcing a steel structure characterized in that it is reduced.

According to the second aspect of the present invention, in the method for reinforcing a steel structure in which the reinforcing material is bonded to the surface of the steel material constituting the steel structure with an adhesive,
The reinforcing material is a sheet-like material in which a reinforcing fiber-containing material having a smaller linear expansion coefficient than that of the steel material constituting the steel structure and an alloy material having a larger linear expansion coefficient than that of the steel material are alternately arranged laterally along the surface of the steel material. To be integrally formed,
There is provided a method for reinforcing a steel structure, characterized in that the sheet-like reinforcing material is bonded to the surface of the steel material with an adhesive, and thermal stress generated in the steel material due to a temperature change of the steel material is reduced. .

According to a third aspect of the present invention, there is provided a steel structure reinforcing laminate for reinforcing a steel structure by bonding with an adhesive to the surface of the steel material constituting the steel structure,
Reinforced fiber-containing material having a smaller linear expansion coefficient than that of the steel constituting the steel structure and an alloy material having a larger linear expansion coefficient than that of the steel are alternately arranged in the lateral direction along the surface of the steel, and are held in a sheet form to be integrated. There is provided a laminate for reinforcing a steel structure, which is characterized in that

  According to one embodiment of the present invention, the reinforcing material or the steel structure reinforcing laminate is bonded to the surface of the steel material in a plurality of layers.

  According to another embodiment of the present invention, the reinforcing fiber-containing material and the alloy material are in the form of a plate or rod extending in the longitudinal direction of the steel material.

  According to another embodiment of the present invention, the linear expansion coefficient (αs) of the steel material is 10 (μ / ° C.) ≦ αs ≦ 18 (μ / ° C.), and the reinforcing fiber-containing material bonded to the steel material The linear expansion coefficient (αf) of the alloy material is −15 (μ / ° C.) ≦ αf <αs, and the linear expansion coefficient (αa) of the alloy material is αs <αa ≦ 30 (μ / ° C.).

  According to another embodiment of the present invention, the reinforcing fiber-containing material is produced by aligning continuous reinforcing fibers in one direction, or continuous fibers in which the reinforcing fibers are impregnated with a matrix resin and cured. A fiber-reinforced resin in which a plurality of reinforced plastic wires are produced in a longitudinal direction and aligned in a sag-like manner, or a continuous reinforcing fiber sheet aligned in one direction is impregnated with a resin and the resin is cured. is there.

  According to another embodiment of the present invention, the alloy material is an aluminum alloy, a stainless steel alloy or a magnesium alloy.

According to another embodiment of the present invention, the reinforcing fiber of the reinforcing fiber-containing material may be carbon fiber, glass fiber, inorganic fiber such as basalt fiber, or aramid, PBO (polyparaphenylene benzbisoxazole), polyamide, poly Organic fibers such as arylates and polyesters are used singly or in mixtures of two or more species,
The matrix resin impregnated in the reinforcing fiber-containing material and the adhesive are heat-curable epoxy resin, vinyl ester resin, MMA resin, acrylic resin, unsaturated polyester resin, phenol resin, etc. It is a curable resin, or a thermoplastic resin such as nylon or vinylon.

  According to the steel structure reinforcing method and the steel structure reinforcing laminated material of the present invention, the thermal stress generated in the steel material due to temperature change can be reduced, and a sufficient reinforcing effect can be obtained.

Fig.1 (a) is a perspective view for demonstrating one Example of the reinforcement method of the steel structure of this invention, FIG.1 (b) is an axis-perpendicular direction of the steel member in FIG. 1 (a). 1 (c) is a perspective view of the alloy material and the reinforcing fiber-containing material, and FIG. 1 (d) is a perspective view of another embodiment of the alloy material and the reinforcing fiber-containing material. It is. It is a figure which shows one Example of the fiber sheet for producing the reinforcement fiber containing material used for the reinforcement method of the steel structure of this invention. It is a figure which shows one Example of the fiber reinforced resin board for producing the reinforcement fiber containing material used for the reinforcement method of the steel structure of this invention. It is a perspective view which shows the other Example of the fiber sheet for producing the reinforcement fiber containing material used for the reinforcement method of the steel structure of this invention. It is sectional drawing of the fiber reinforced plastic wire which comprises the fiber sheet shown in FIG. It is a perspective view which shows the other Example of the fiber sheet for producing the reinforcement fiber containing material used for the reinforcement method of the steel structure of this invention. Fig.7 (a), (b) is a perspective view which shows the Example of the reinforcement laminated material used for the reinforcement method of the steel structure of this invention. It is process drawing explaining one Example of the reinforcement method of the steel structure of this invention. It is a figure explaining the composition of various specimens for demonstrating the reinforcement method of the steel structure of this invention. FIG. 10 (a) is a view for explaining the installation position of the strain gauge in the temperature change test of each test body, and FIG. 10 (b) is the strain gauge in the temperature change test of the test body of the configuration according to the present invention. It is a figure explaining the attachment position of. FIGS. 11 (a) to 11 (d) show temperature change tests of the respective test bodies, and are diagrams for explaining the thermal stress generated at that time. 12 (a) to 12 (d) show temperature change tests of the respective test bodies, and are diagrams for explaining the thermal stress generated at that time. FIGS. 13 (a) and 13 (b) are diagrams for explaining the thermal stress generated in the steel member reinforced by the conventional method. Fig.14 (a), (b) is a figure for demonstrating the thermal stress which arises in the steel member reinforced by the conventional method. It is a perspective view of the test object reinforced by the conventional method. Fig.16 (a) is a figure which shows the fluctuation | variation of the air temperature from 8 am in the exposure test of the test object reinforced by the conventional method shown in FIG. 15, FIG.16 (b) performed the exposure test It is a figure which shows the thermal stress which arises by the temperature change of 1 day in a test body.

  Hereinafter, the method for reinforcing a steel structure and the laminate for reinforcing a steel structure according to the present invention will be described in more detail with reference to the drawings.

  First, as described above with reference to FIGS. 13 (a) and 13 (b), such as a CFRP plate constituting the reinforcing member 100 on the surface of the steel member 200 constituting the steel structure as described in Patent Document 2. In a reinforcing method of a steel structure in which a reinforcing fiber-containing material 1 and an alloy material 10 made of an alloy plate such as an AL plate are stacked and laminated with an adhesive, heat generated in the steel member 200 due to temperature change The stress reduction will be briefly described.

  As shown in FIGS. 14A and 14B, the thermal stress generated when a plurality (N) of reinforcing plate 100 a as the reinforcing material 100 is bonded to one side of the steel member 200 with the adhesive 110 is as follows. It is given by Formula (Formula (1)-(6)).

  Further, when reinforcing the steel member 200, as shown in FIG. 13, the CFRP plate 1 and the AL plate 10 are used as the caulking plate 100a, and these caulking plates 100a are bonded and integrated into a composite plate (that is, reinforcement When the material 100) is used, the reinforcing material 100 linear expansion coefficient α か ら is given by the following equation (7) from the balance of internal forces due to the thermal expansion and contraction of each CFRP plate 1 and each AL plate 10.

  The equation (7) is substituted for the linear expansion coefficient αs of the steel member 200, and the elongation rigidity ratio EaAa / (EfAf) of the AL plate 10 to the CFRP plate 1 is solved to obtain the following equation (8).

  By substituting the linear expansion coefficients of the steel member 200, the CFRP plate 1 and the AL plate 10 into this formula (8), the CFRP plate and the reinforcing plate 10 of the AL plate have the same linear expansion coefficient as that of the steel member 200. The elongation rigidity of the AL plate can be designed with respect to the elongation rigidity of the plate.

  Here, for example, the CFRP plate 1 and the AL plate 10 are used as the contact plates with respect to the steel member (steel plate) 200, and the above occurs due to the difference in centroid distance between the CFRP plate 1 and the AL plate 10 from the composite cross section. In order to set the value of Mν in equation (3) to 0, as shown in FIG. 15, a laminated plate (reinforcement) in which a CFRP plate 1 is laminated between two AL plates 10 and 10 and bonded with an adhesive 110. The case where the material 100 is used will be described.

  In this case, when the material of the specification described in the following Table 1 is used as the steel plate 200, the CFRP plate 1, the adhesive 110, and the AL plate 10, the AL plate 10 calculated by the above formulas (7) and (8). The linear expansion coefficient of the reinforcing material 100 composed of the CFRP plate 1 was 10.8 μ / ° C.

  An exposure test is performed on the test body of the above configuration (hereinafter referred to as “test body ACA”), and the change in air temperature and the change in thermal stress on that day are shown in FIGS. 16 (a) and 16 (b). . From FIG. 16 (b), in the test body ACA in which the CFRP plate 1 and the AL plate 10 are bonded, a thermal stress is generated in the AL plate 10 (and the CFRP plate 1). Know that It can be seen that their values also substantially match the relative temperature difference from 8:00 am and the calculated values of the above equations (1) and (2).

  As described above, in the construction method in which the CFRP plate 1 and the AL plate 10 are stacked on the steel plate 200 and laminated to reduce the thermal stress, when the laminated plate (reinforcing material) 100 is bonded to one side of the steel member, A thin member may be affected by the order of stacking and may be subjected to thermal stress of the steel member, but Mν generated by the difference in the centroid distance between the CFRP plate 1 and the AL plate 10 from the composite cross section becomes zero. By laminating the CFRP plate 1 and the AL plate 10 on each other, the thermal stress of the steel plate 200 can be significantly reduced.

  In view of the above findings, the present inventors have conducted further experimental studies. As a result, as shown in FIGS. 1A to 1C, the reinforcing fiber-containing material 1 such as a CFRP plate and an alloy By alternately arranging and bonding the alloy plates 10 such as the material AL plate along the surface of the steel member 200 in the lateral direction, the same result as the reinforcing method of the steel structure described above can be achieved. I found out.

  That is, referring to FIGS. 1 (a) and 1 (b), according to the method for reinforcing a steel structure according to the present invention, a predetermined thickness (T), for example, steel having a thickness of 1 to 50 mm, stainless steel, etc. The steel structure reinforcing material 100 is bonded and integrated with the reinforced surface 201 of the steel material by the adhesive 110 to the steel structure 200 made of steel material.

  According to the present invention, the steel structure reinforcing material 100 includes the reinforcing fiber-containing material 1 having a smaller linear expansion coefficient than the steel material 200 constituting the steel structure and the alloy material 10 having a larger linear expansion coefficient than the steel material 200. Be done. Further, according to the present invention, the reinforcing fiber-containing material 1 and the alloy material 10 constituting the reinforcing material 100 are bonded to the reinforced surface 201 of the steel material 200 alternately and in an adhesive 110. That is, in the example shown in FIGS. 1 (a) and 1 (b), the reinforcing material 100 is an alloy material 10, a reinforcing fiber-containing material 1, an alloy material from the left side to the right side The edges of the members are juxtaposed adjacent to each other, such as 10, reinforcing fiber-containing material 1, alloy material 10, reinforcing fiber-containing material 1, alloy material 10, and so on. If necessary, it is further laminated on the reinforcing material 100 adhered to the surface of the above-mentioned steel material, and the reinforcing fiber-containing material 1 and the alloy material 10 are alternately juxtaposed as described above. Material 100 can be further adhered.

  Alternatively, as shown in FIG. 1A, the reinforcing material 100 includes the reinforcing fiber-containing material 1 and the alloy material 10 arranged adjacent to each other, and the reinforcing fiber-containing material 1 and the alloy material 10 adjacent to each other. Join the edges with an adhesive to form a sheet, or, as shown in FIGS. 7 (a) and 7 (b), use a mesh-like or tape-like fixing material 3 or the like. Each of the reinforcing fiber-containing materials 1 and the alloy material 10 can be integrally held to form a sheet-like laminate.

  More specifically, in FIG. 7A, the surface of the warp yarn 4 and the weft yarn 5 constituting the mesh-like support sheet as the wire fixing material is impregnated with a low melting point type thermoplastic resin in advance. The sheet of support sheet is laminated on one side or both sides of the alloy material 10 and the reinforcing fiber-containing material 1 arranged in a sheet form and heated and pressed, and the portions of the warp 4 and the weft 5 of the mesh-like support sheet 3 It is welded to the reinforcing fiber-containing material 1.

  In addition to the biaxial configuration, the mesh-shaped support sheet 3 is formed by orienting glass fibers in three axes, or only the wefts 5 orthogonal to the carbon fibers arranged in one direction. It is also possible to adhere to the so-called uniaxially oriented carbon fibers aligned and arranged in the sheet shape.

  Moreover, as a yarn of the above-mentioned wire fixing material 3, for example, a composite fiber of double structure in which glass fiber is included in the core and low melting point heat fusible polyester is disposed around it is also preferably used. .

  Furthermore, as another method for holding each reinforcing fiber-containing material 1 and the alloy material 10 together and fixing them in a sheet form, as shown in FIG. Alternatively, a flexible belt material such as an adhesive tape can be used. The flexible band 3 is attached to one side or both sides of the alloy material 10 and the reinforcing fiber-containing material 1 in a direction perpendicular to the longitudinal direction of the alloy material 10 and the reinforcing fiber-containing material 1 in sheet form. Fix it.

  That is, as the flexible strip 3, an adhesive tape or adhesive tape such as a vinyl chloride tape, a paper tape, a cloth tape, and a nonwoven fabric tape having a width (w1) of about 2 to 30 mm is used. Usually, these tapes 3 are stuck in a direction perpendicular to the longitudinal direction of the alloy material 10 and the reinforcing fiber-containing material 1 at intervals of 10 to 100 mm (P).

  Furthermore, as the flexible strip 3, the thermoplastic resin such as nylon or EVA resin is formed into a strip and is heat-bonded to one side or both sides in the direction perpendicular to the longitudinal direction of the wire 2. Be done.

  The sheet-like laminated material (reinforcement material) 100 can be bonded to the surface to be reinforced of a predetermined steel material 200 with an adhesive 110. The laminated material 100 in the form of a sheet can be laminated by laminating a plurality of layers on the surface of the steel material as required.

  In the above description, it has been described that both ends of the reinforcing material 100 are the alloy material 10, but the present invention is not limited to this, and both ends of the reinforcing material 100 may be the reinforcing fiber-containing material 1.

  Next, each material used in the present invention will be further described.

(Steel structure reinforcement)
As shown in FIG. 1A, the steel structure reinforcing material 100 is configured by alternately arranging reinforcing fiber-containing materials 1 having a smaller linear expansion coefficient than the steel material 200 and alloy materials 10 having a larger linear expansion coefficient than the steel material 200. Is done. Normally, the steel material 200 has a linear expansion coefficient (αs) of 10 (μ / ° C.) ≦ αs ≦ 18 (μ / ° C.). Therefore, in the reinforcing fiber-containing material 1, the linear expansion coefficient (αft) of the reinforcing fiber itself contained is −15 (μ / ° C.) ≦ αft <αs, and the linear expansion coefficient (αfm) of the matrix resin itself is Usually, 30 (μ / ° C.) ≦ αfm ≦ 150 (μ / ° C.), but the linear expansion coefficient (αf) of the reinforcing fiber-containing material itself in the state of being impregnated and cured with the matrix resin is −15 (μ / ° C) ≦ αf <αs. The alloy material 10 has a linear expansion coefficient (αa) of αs <αa ≦ 30 (μ / ° C.).

  The reinforcing fiber-containing material 1 and the alloy material 10 constituting the reinforcing material 100 may have any shape. In FIGS. 1A to 1C, the cross section is a rectangular (rectangular) flat, so-called elongated plate-shaped (strip-shaped) member, but as shown in FIG. It may be an elongated rod-like member having a rectangular (approximately square) cross section, a circular or elliptical cross section, or any other shape.

  Regarding the reinforcing fiber-containing material 1, particularly when it relates to the reinforcing fiber-containing material 1 using carbon fiber or the like, the linear expansion coefficient is small, and there is no need to consider the influence of the steel material 200 in the direction perpendicular to the axis, Since the linear expansion coefficient of the steel material 200 of the alloy material 10 in the direction perpendicular to the axis is the same as that in the axis direction, thermal stress is also generated in the direction perpendicular to the axis due to the difference in relative elongation between the steel member 200 and the alloy material 10. Therefore, particularly in the case of the alloy material 10, in order to reduce the influence of the thermal stress in the direction perpendicular to the steel axis, the steel material 200 extends in the longitudinal direction as shown in FIGS. The cross section is a flat strip (plate) having a rectangular (rectangular) shape, or, as shown in FIG. 1 (d), a rectangular (substantially square) shape, a circular or elliptical rod shape Is preferred. For example, in FIG.1 (c), it is equivalent to the to-be-reinforced surface 201 of the steel material 200 which cross-sectional shape was made long in the axial direction as width (W10) 1-50 mm and thickness (T10) 0.1-2 mm. It is preferable to lengthen. Accordingly, the reinforcing fiber-containing material 1 sandwiched between the alloy material 10 and the alloy material 10 also has a cross-sectional shape with a width (W1) of about 1 to 50 mm and a thickness (T1) of 0.1 to 2 mm in the fiber axis direction. It is preferable to make the length of the same as the alloy material 10.

  As described above, the shapes and dimensions of the reinforcing fiber-containing material 1 and the alloy material 10 are not limited to the above-described structure, and variously change according to the shape and dimensions of the steel material 200 to be reinforced. be able to.

(1) Reinforcing Fiber-Containing Material In the present invention, various forms of the reinforcing fiber-containing material 1 can be used. Examples of the reinforcing fiber-containing material 1 will be described below as specific examples 1 to 3, but the form of the reinforcing fiber-containing material 1 used in the present invention is not limited to those shown in these specific examples. Moreover, although the shape of the reinforcing fiber containing material 1 demonstrated below shall comprise a reinforcing material by plate shape (strip shape), it is as above-mentioned that it is not limited to this.

Example 1
FIG. 2 shows an embodiment of a reinforcing fiber-containing material 1 which can be used in the present invention. The reinforcing fiber-containing material 1 is a non-resin-impregnated fiber sheet 1A configured in a sheet shape by aligning continuous reinforcing fibers f in one direction. The fiber sheet 1A not impregnated with resin is impregnated with resin in the reinforcing step, and the thickness of the fiber sheet 1A is 0.1 to 0.3 mm. 1 A of fiber sheets are laminated | stacked and used as needed.

More specifically, the fiber sheet 1A can have a configuration in which a reinforcing fiber sheet composed of continuous reinforcing fibers f aligned in one direction is held by a wire fixing material 3 such as a mesh-like support sheet. . For example, when carbon fibers are used as the reinforcing fibers f, for example, a plurality of unimpregnated single fiber bundles in which 6000 to 24000 single fibers (carbon fiber monofilaments) f having an average diameter of 7 μm are converged in parallel in one direction. Used to align. The fiber basis weight of the carbon fiber sheet 1A is usually 30 to 1000 g / m ² .

  Carbon in which the low melting point type thermoplastic resin is impregnated in advance on the surface of the warp 4 and weft 5 constituting the mesh-like support sheet as the wire fixing material 3 and the mesh-like support sheet 3 is arranged in a sheet The fiber is laminated on one side or both sides of the fiber and heated and pressed to weld the portions of the warp 4 and the weft 5 of the mesh-like support sheet 3 to the carbon fiber sheet.

  In addition to the biaxial configuration, the mesh-shaped support sheet 3 is formed by orienting glass fibers in three axes, or only the wefts 5 orthogonal to the carbon fibers arranged in one direction. It is also possible to adhere to the so-called uniaxially oriented carbon fibers aligned and arranged in the sheet shape.

  Moreover, as a yarn of the above-mentioned wire fixing material 3, for example, a composite fiber of double structure in which glass fiber is included in the core and low melting point heat fusible polyester is disposed around it is also preferably used. .

Example 2
Further, as shown in FIG. 3, the reinforcing fiber-containing material 1 is formed by laminating one or a plurality of reinforcing fiber sheets in which a plurality of reinforcing fibers f are aligned in one direction, for example, a fiber sheet 1A as shown in FIG. Then, a plate-like fiber reinforced resin plate (hereinafter referred to as “FRP plate”) 1B impregnated with resin Re and cured with the resin may be used. The thickness of the fiber-reinforced resin board 1B is usually 0.1 to 2 mm, but is not limited thereto.

  In the fiber sheet 1A and the fiber reinforced resin plate 1B described in the first and second specific examples, the reinforcing fibers f are not limited to carbon fibers, and in addition, inorganic fibers such as glass fibers and basalt fibers, and further, Organic fibers such as aramid fibers, PBO (polyparaphenylene benzbisoxazole) fibers, polyamide fibers, polyarylate fibers, and polyester fibers can be used alone or in a mixture of plural kinds.

  Moreover, as resin Re in the case of the fiber reinforced resin board 1B in the specific example 2, a thermosetting resin or a thermoplastic resin can be used, As a thermosetting resin, a normal temperature curing type or a thermosetting type is possible. Epoxy resin, vinyl ester resin, MMA resin, acrylic resin, unsaturated polyester resin, phenol resin, or the like is preferably used, and nylon, vinylon, or the like can be preferably used as the thermoplastic resin. The resin impregnation amount is 30 to 70% by weight, preferably 40 to 60% by weight.

Example 3
Furthermore, as shown in FIGS. 4 and 5, the reinforcing fiber-containing material 1 has a plurality of continuous thin fiber reinforced plastic wires (so-called strands) 2 that are impregnated with a matrix resin R and hardened. It is also possible to use a fiber sheet (so-called strand sheet) 1 </ b> C in which the wires 2 are aligned in a direction and are fixed to each other by a wire fixing material 3.

  The fiber reinforced plastic wire 2 has a substantially circular cross-sectional shape (FIG. 5A) having a diameter (d) of 0.5 to 3 mm, or a width (w) of 1 to 10 mm and a thickness (t) of 0. A substantially rectangular cross-sectional shape (FIG. 5 (b)) of 1 to 2 mm can be used. Of course, other various cross-sectional shapes can be used as necessary.

  As described above, in the fiber sheet 1 </ b> C that is aligned and slid in one direction, the wires 2 are close to and separated from each other by a gap (g) = 0.05 to 3.0 mm. It is fixed. In addition, the length (Lf) and width (Wf) of the fiber sheet 1C formed in this way are appropriately determined according to the size and shape of the structure to be reinforced, The total width (Wf) is 100 to 1000 mm. Further, the length (Lf) can be a strip of about 1 to 5 m, or a length of 100 m or more, but the width and length are appropriately cut during use.

  It is also possible to manufacture the fiber sheet 1C with a length (Lf) of about 1 to 5 m and a width Wf longer than this, about 1 to 10 m. Although thickness tf of fiber sheet 1C is 0.1-2 mm, it is not limited to this.

  Also in the case of the fiber sheet 1C, as the reinforcing fiber f, inorganic fibers such as carbon fiber, glass fiber, basart fiber, and further, aramid, PBO (polyparaphenylene benzbisoxazole), polyamide, polyarylate, polyester, etc. Organic fibers can be used alone or in combination of two or more species in a hybrid. The matrix resin R impregnated in the fiber reinforced plastic wire 2 can be a thermosetting resin or a thermoplastic resin. As the thermosetting resin, a room temperature curing type or a thermosetting type epoxy resin, Vinyl ester resins, MMA resins, acrylic resins, unsaturated polyester resins, or phenol resins are preferably used, and nylon, vinylon, etc. can be suitably used as the thermoplastic resin. The resin impregnation amount is 30 to 70% by weight, preferably 40 to 60% by weight.

  Further, as a method of fixing each wire 2 with the wire fixing material 3, for example, as shown in FIG. 4, a plurality of wires arranged in a sag-like manner using wefts as the wire fixing material 3 are arranged. It is possible to adopt a method of driving and knitting a wire rod in the form of a sheet consisting of two, that is, a continuous wire rod sheet at a constant interval (P) perpendicular to the wire rod. The driving interval (P) of the weft yarn 3 is not particularly limited, but is usually selected in the range of 10 to 100 mm in consideration of the handleability of the produced fiber sheet 1.

  At this time, the weft yarn 3 is, for example, a yarn obtained by bundling a plurality of glass fibers or organic fibers having a diameter of 2 to 50 μm. Moreover, nylon, vinylon, etc. are used suitably as an organic fiber.

  As another method of fixing each wire 2 in a slender shape, a mesh-like support sheet can be used as the wire fixing member 3 as shown in FIG.

  That is, the above-mentioned specific example in which a plurality of wire rods 2 arranged in the form of a sheet in a sheet form, that is, one side or both sides of a wire sheet is made of glass fiber or organic fiber having a diameter of 2 to 50 μm, for example. It may be configured to be supported by a mesh-like support sheet 3 having the same configuration as that described in 1.

  Furthermore, as another method of fixing each wire 2 in a slender shape, as shown in FIG. 6 (b), as the wire fixing material 3, for example, a flexible belt material such as an adhesive tape or an adhesive tape is used. It can be used. The flexible strip 3 has one side or both sides of a plurality of fiber reinforced plastic wires 2 in a direction perpendicular to the longitudinal direction of each of the fiber reinforced plastic wires 2 aligned in a sheet-like form. Paste and fix.

  That is, as the flexible strip 3, an adhesive tape or adhesive tape such as a vinyl chloride tape, a paper tape, a cloth tape, and a nonwoven fabric tape having a width (w1) of about 2 to 30 mm is used. Usually, these tapes 3 are stuck in a direction perpendicular to the longitudinal direction of each fiber reinforced plastic wire 2 at intervals of 10 to 100 mm (P).

  Furthermore, as the flexible strip 3, the thermoplastic resin such as nylon or EVA resin is formed into a strip and is heat-bonded to one side or both sides in the direction perpendicular to the longitudinal direction of the wire 2. Be done.

(2) Alloy material The alloy material 10 constituting the reinforcing material 100 shown in FIG. 1 is an aluminum alloy, a stainless alloy, a magnesium alloy, or the like. As described above, the shape of the alloy material 10 is appropriately determined according to the size and shape of the steel structure 200 to be reinforced, but is a rectangular (rectangular) cross-sectional strip (plate) or rectangular (substantially) It is preferable to be in the shape of a bar having a square), circular, elliptical cross section.

(3) Adhesive An adhesive 110 for adhering the reinforcing material 100 to the steel surface, and an adhesive 110 for adhering the reinforcing fiber-containing material 1 and the alloy material 10 adjacent to each other, if necessary, contain the reinforcing fibers. It can be the same as the matrix resin impregnated in the material 1, and a thermosetting resin or a thermoplastic resin can be used. For example, as the thermosetting resin, room temperature curing type or thermosetting type epoxy resin, vinyl ester resin, MMA resin, acrylic resin, unsaturated polyester resin, phenol resin, etc. are preferably used, and thermoplasticity is also used. As the resin, nylon, vinylon and the like can be suitably used. As described above, the layer thickness (T110) of the adhesive 110 is in the range of 100 to 1000 μm.

(Reinforcing method)
According to the present invention, the reinforcing fiber-containing material 1 and the alloy material 10 configured as described above are alternately and sequentially arranged on the surface of the steel structure 200, or the reinforcing fiber-containing material 1 and the alloy material 10 are preliminarily attached. The steel laminate 200 can be reinforced by adhering the reinforcing laminate formed in a sheet form and integrated as a reinforcement 100 to the surface of the steel construct 200.

  As understood with reference to FIGS. 1 (a) and 1 (b), according to the method for reinforcing a steel structure of the present invention, for example, the reinforcing fiber-containing material 1 includes the above-described reinforcing fiber-containing material specific examples 1-3. The fiber sheet 1 produced by aligning the reinforcing fibers f described in the above in one direction and the alloy plate 10 as an alloy material can be used, and these reinforcements are alternately arranged on the surface of the steel structure 200. They are lined up and glued together with an adhesive 110 for integration.

  The fiber sheets 1 (1A to 1C) as the reinforcing fiber-containing material are disposed such that the axial direction of the reinforcing fibers f coincides with the axial direction of the steel material 200. Generally, when reinforcing the steel structure 200, bending moment and For a member (structure) that mainly receives an axial force, the fiber sheet 1 is effective by adhering the orientation direction of the reinforcing fibers to substantially coincide with the main stress direction of the tensile stress or compressive stress caused by the bending moment. Stress to effectively improve the load-bearing capacity of the structure.

  When bending moments act in two directions orthogonal to each other, for example, when using the fiber sheet 1 in which the reinforcing fibers f are arranged in one direction, the orientation direction of the reinforcing fibers f substantially matches the principal stress generated by the bending moment As described above, the load resistance can be efficiently improved by laminating and bonding the two or more fiber sheets 1A at right angles.

  Next, with reference to FIG. 8, the reinforcing method of the steel structure according to the present invention will be more specifically described.

(Step 1)
As shown in FIGS. 8A and 8B, the weakened portion 201a of the surface to be reinforced (that is, the surface to be bonded) 201 of the steel structure 200 is ground with a disk sander, sandblast, steel shot blast, water jet or the like. The substrate 50 is removed by the means 50 and the surface to be bonded 201 of the steel structure 200 is subjected to a ground treatment so as to become a surface 202 having an appropriate roughness.

(Step 2)
An epoxy resin primer 203 is applied to the surface 202 which has been subjected to the surface treatment (FIG. 8 (c)). The primer 203 is appropriately selected according to the material of the steel structure to be reinforced 200 such as MMA resin without being limited to the epoxy resin system.

  In addition, the application process of the primer 203 can be omitted.

(Third step)
Next, as shown in FIGS. 8D and 8E, an adhesive (resin) 110 is applied to the surface (reinforced surface) 202 of the steel structure 200 to be reinforced, and on this surface, in this embodiment, From the left side to the right side, the alloy plate 10 and the CFRP plate 1 are alternately bonded onto the steel surface like the alloy plate 10, the CFRP plate 1, the alloy plate 10, the CFRP plate 1,. The amount of adhesive 110 is applied such that the thickness of the adhesive layer is 100 to 1000 μm. In this example, the CFRP plate 1 is used as the reinforcing fiber-containing material. However, when the strand sheet 1C not impregnated with resin is used, the adhesive 110 is partly adjacent to the alloy material 10 and the strand sheet. While being impregnated in the 1C joint area, it is also impregnated in the void (g) of the strand sheet 1C.

  As the adhesive 110 used, the same one as the matrix resin R impregnated in the wire material (strand) 2 of the strand sheet 1C described above is used, and in particular, a room temperature curable epoxy resin, an epoxy acrylate resin, an acrylic resin, MMA resin, vinyl ester resin, unsaturated vinyl ester resin, photocurable resin, etc. may be mentioned, and specifically, room temperature curable epoxy resin and MMA resin are preferable. In this example, an epoxy resin was used.

  Of course, as the reinforcing fiber-containing material 1, the fiber sheet 1A shown in the specific example 1 can be used instead of the CFRP plate 1 and the strand sheet 1C. In this case, the fiber sheet 1A is not impregnated with resin. Because of the sheet 1A, a part of the adhesive (resin) applied to the surface of the steel material is impregnated into the fiber sheet 1A as a matrix resin. Of course, the on-site resin-impregnated fiber sheet 1A may be pressed and adhered onto the steel structure surface 202. The amount of resin impregnated into the fiber sheet 1A in this case is 30 to 70% by weight, preferably 40 to 60% by weight, as described above.

  As shown in FIG. 8 (f), the reinforcing material 100 formed by alternately arranging the reinforcing fiber-containing material 1 and the alloy material 10 is integrally bonded to the steel material surface 202 by the reinforcing operation, and the steel structure 200 is reinforced.

  Further, if necessary, the reinforcing fiber-containing material 1 and the alloy material 10 are alternately laminated on the reinforcing material 100, whereby the reinforcing material 100 including the reinforcing fiber-containing material 1 and the alloy material 10 respectively. It is possible to reinforce steel with multiple layers of

  In the above description of the reinforcing method, the reinforcing fiber-containing material 1 and the alloy material 10 are alternately bonded to the surface of the steel material through an adhesive to alternately reinforce the steel material with the reinforcing material 100. A reinforcing material (reinforcing laminated material) 100 made of a laminate in which the fiber-containing material 1 and the alloy material 10 are alternately arranged and bonded together in a sheet shape is pressed and bonded onto the steel surface 202 to which the adhesive 110 is applied. You can also. A desired number of layers (N) of the laminated material 100 can be further laminated and laminated on the reinforcing material (laminated material) 100 of the laminated configuration. The number of laminations (N) is appropriately determined depending on the required degree of steel plate reinforcement.

  The following tests were conducted to demonstrate the function and effect of the method of reinforcing a structure according to the present invention. Test examples will be described below.

  In the reinforcing method of the present invention, carbon fiber is typically used as the reinforcing fiber of the reinforcing fiber-containing material 1, and therefore, as the reinforcing fiber of the reinforcing fiber-containing material (fiber sheet) 1 in this test example, Carbon fiber was used. In addition, since an aluminum alloy plate (AL plate) having a rectangular cross-sectional shape is typically used as the alloy material 10 in the reinforcing material 100, the test was performed using the AL plate in this test example. Fiber sheet 1 and AL board 10 were made into strip shape.

(Test example)
(1) Test conditions
Specimen In the present test example, as a test specimen having a configuration according to the present invention, a CFRP plate obtained by impregnating a resin in a strand sheet 1C as a reinforcing fiber-containing material 1 and cured as shown in FIG. It was set as the structure (henceforth "test body CSA") which lined up the AL board as material 10, and adhered to one surface (surface to be reinforced) of steel 200.

  As a comparative example, a test body (hereinafter referred to as “test body”) in which the AL plate 10, the CFRP plate 1, and the AL plate 10 are laminated and bonded to one surface (reinforced surface) of the steel material 200 as shown in FIG. ACA ”) and a test body (hereinafter referred to as“ test body CC ”) having a configuration in which only the CFRP plate 1 is bonded to one surface (reinforced surface) of the steel material 200 shown in FIG. 9C. And the test body (henceforth "the test body AA") of the structure which adhere | attached only AL board 10 to one surface (surface to be reinforced) of the steel materials 200 shown in FIG.9 (d) was produced.

-Specimen CSA
In the test body CSA shown in FIG. 9A, a steel plate 200 having a width of 25 mm, a thickness of 4.5 mm, and a length of 160 mm was used as the steel material 200 to be a reinforcing body (base material). The CFRP plate 1 was prepared by impregnating a gap sheet (g) with a strand sheet 1C in which a plurality of carbon fiber plastic wires 2 using an epoxy resin as an impregnating resin were arranged in a slender shape in the longitudinal direction. . The carbon fiber was a highly elastic type having a Young's modulus of fiber of 702 N / mm ² and a breaking strength of 2.96 kN / mm ² . The strand sheet 1C has a design thickness of 0.429 mm (a thickness of 1 mm in the CFRP plate), a width of 4.2 mm, and a length of 100 mm. The linear expansion coefficient of the CFRP plate 1 in which the strand sheet 1C is impregnated with resin (epoxy resin) Was 1.2 μ / ° C.
The AL plate 10 was formed in a strip shape having a rectangular cross section with a thickness of 2 mm, a width of 3.2 mm, and a length of 100 mm.

-Specimen ACA
In the test body ACA shown in FIG. 9 (b), the test body ACA has the same configuration as that of the test body ACA subjected to the exposure test shown in FIG. 15, but as a steel material 200 serving as a reinforcing body (base material). Used a steel plate having a width of 25 mm, a thickness of 4.5 mm, and a length of 160 mm. The CFRP plate 1 was prepared by impregnating a gap sheet (g) with a strand sheet 1C in which a plurality of carbon fiber plastic wires 2 using an epoxy resin as an impregnating resin were arranged in a slender shape in the longitudinal direction. . The carbon fiber was a high elasticity type having a Young's modulus of 702 N / mm ² and a breaking strength of 2.96 kN / mm ² . The strand sheet 1C has a design thickness of 0.429 mm (thickness of 1 mm in the CFRP plate), a width of 25 mm, and a length of 100 mm. The linear expansion coefficient of the CFRP plate 1 in which the strand sheet 1C is impregnated with resin (epoxy resin) is 1.2 μ / ° C. It laminated | stacked and used the aspect which clamps the CFRP board 1 of 1 sheet by the AL board 10 of 2 sheets.
The AL plate 10 was a rectangular flat plate having a rectangular cross section with a thickness of 1 mm, a width of 25 mm, and a length of 100 mm.

-Specimen CC
In the test body ACA shown in FIG. 9C, a steel plate 200 having a width of 25 mm, a thickness of 4.5 mm, and a length of 160 mm was used as the steel material 200 serving as a reinforcing body (base material). The CFRP plate 1 is produced by impregnating a plurality of carbon fiber plastic wires 2 using an epoxy resin as an impregnating resin, a strand sheet 1C arranged in a slender shape in the longitudinal direction, and further impregnating the epoxy resin into a gap (g). did. The carbon fiber was a highly elastic type having a Young's modulus of fiber of 702 N / mm ² and a breaking strength of 2.96 kN / mm ² . Strand sheet 1C is designed to have a thickness of 0.429 mm (thickness 1 mm of CFRP board), width 25 mm, length 100 mm, and this strand sheet 1 C is a CFRP board 1 impregnated with a resin (an epoxy resin as an adhesive). The linear expansion coefficient was 1.2 μ / ° C. Two CFRP plates 1 were laminated and used.

-Specimen AA
In the test body AA shown in FIG. 9 (d), a steel sheet 200 having a width of 25 mm, a thickness of 4.5 mm, and a length of 160 mm was used as the steel material 200 serving as a reinforcing body (base material). The AL plate was used by laminating two rectangular flat plates each having a thickness of 2 mm, a width of 25 mm, and a length of 100 mm and having a rectangular cross section.

  The CFRP plate 1 and AL plate 10 used for the specimens CSA, ACA, CC, and AA are the same as the materials shown in Table 1 above, and the material constants of the steel sheet having a thickness of 4.5 mm are as described above. As shown in Table 1.

  The adhesive surfaces of the steel plate 200, the CFRP plate 1, and the AL plate 10 were polished with # 100 sandpaper, wiped off the oils and fats, and then bonded with the adhesive 110, respectively. The adhesive 110 was a material (epoxy resin) shown in Table 1 above, and the thickness of the adhesive layer was about 0.13 mm (130 μm).

Test Method In this test example, the test specimens CSA, ACA, CC, AA were used, and the thermal stress reduction effect was clarified by the temperature rise test and the temperature drop test.

  An electric high temperature furnace was used for the temperature rise test, and a freezer was used for the temperature drop test. In a test room controlled to 20 ° C., the temperature inside the electric high temperature furnace was set to 50 ° C. when the temperature rose, and the freezer was set to −10 ° C. when the temperature dropped. That is, a temperature change test was performed so as to be 20 ° C. ± 30 ° C.

  The strain measurement position in the test body ACA is shown in FIG. The strain gauges SG were placed on the outer surface of the steel plate 200 and the reinforcing member 100 and in the axial direction of the test body at a central portion of the width of the test body and a position of 35 mm and 45 mm from the central portion. The same applies to the test bodies CC and AA.

  In the test body CSA, the strain gauge SG was installed at the central portion of the width of the test body in the axial direction of the test body as in the case of the above test body, but as shown in FIG. The strain gauge SG was also bonded to the width center of the AL plate 10 on both sides of the strain gauge SG at the center of the width of the test body to which the plate 1 is bonded.

  In the temperature change test, in addition to each test body, the strain of the steel plate, the CFRP plate, the AL plate, and the CFRP plate alone was also measured. The thermal stress generated in each member was calculated by subtracting the strain measured for each member from the strain measured for each member and multiplying by the Young's modulus of each member. With respect to the CFRP plate 1 of the test body manufactured using the strand sheet 1C, the Young's modulus of CFRP formed by impregnating the fiber sheet 1A with a resin was calculated using the composite law.

In other words, by using the strain epsilon _sn and steel Young's modulus E _s occurring strain epsilon _sm and steel unrestrained occurring measured steel sheet was calculated thermal stress sigma _s caused steel from the following equation.

Similarly, the thermal stress σ _f , σ _a of the outermost CFRP plate or AL plate is calculated using the strain generated on the CFRP plate or AL plate of each specimen and the strain generated on the unconstrained CFRP plate or AL plate. did.

  The thermal stress which arises in each test body at the time of temperature rise and fall is shown to Fig.11 (a)-(d) and FIG. The horizontal axis of the figure indicates the distance x from the center of the bonding length of the CFRP plate and the AL plate.

  As can be seen from FIGS. 11A to 11D and FIGS. 12A to 12D, the thermal stress generated when the temperature rises and when the temperature drops are only different in sign and have almost the same absolute value.

Test Result In the temperature change test, the temperature in the furnace or the freezer was measured with a thermocouple, and after the temperature reached 50 ° C. or −10 ° C., the temperature was maintained until the strain value became constant. For calculation of thermal stress, a value of strain converged to a certain degree was used. Moreover, the temperature measured with the thermocouple was used for calculation of the thermal stress of said Formula (1), (2). In the case of the test body CSA configured according to the present invention, in the above formulas (1) to (7), the symbol i is a reinforcing material arranged in parallel from one end side to the other end side of the reinforcing material 100. It is an integer from the first sheet to the Nth sheet of the (plate).

(1) Temperature Rise Test In the temperature rise test, the measured temperature range was ΔT = 30.3 ° C. The thermal stress measured by each test body is shown to Fig.11 (a)-(d). This figure also shows the thermal stress calculated by substituting the measured temperature range into the equations (1) and (2).

In the test bodies CC and AA, the values of the thermal stress of the steel sheets differed between positive and negative, but about 20 N / mm ^{2 in} absolute value was generated.

  It can be seen that in the test body ACA, the thermal stress generated in the steel plate is almost zero. Moreover, in the test body ACA, the thermal stress which arises in the steel plate in the center of a test body, CFRP board, or AL board was in agreement with the value of Formula (1), (2).

  In the test body CSA, since the elongation rigidity of CFRP board 1 and AL board 10 did not correspond when it calculated by Formula (1) using the dimension after test body manufacture, it was in the state which some thermal stress produces. Also in the actual measurement value, a slight thermal stress was generated in the steel plate although the agreement with the calculated value was different. However, there was no difference in the thermal stress generated in the steel plate at the position where the CFRP plate 1 and the AL plate 10 were bonded. The thermal stress of the CFRP plate 1 and the AL plate 10 at the center of the test body was a value close to the calculated value of the equation (2).

  As described above, the test body CSA constructed according to the present invention has a significantly reduced thermal stress generated in the steel sheet as compared with the test bodies CC and AA. It was found that it could be reduced to the same level as body ACA.

(2) Temperature drop test In the temperature drop test, the measured temperature was ΔT = −29.8 ° C. The thermal stress measured by each test body is shown to Fig.12 (a)-(d). As is clear from FIGS. 12A to 12D, it can be seen that the results of the temperature decrease test differ in the positive and negative results of the temperature increase test of FIG. In general, the Young's modulus of the adhesive slightly changes depending on the temperature even if it is below the glass transition temperature, but it can be said that the adhesive used in this test hardly affects the thermal stress in the range of −10 to 50 ° C. .

  Also in this test, the test specimen CSA constructed according to the present invention has a significantly reduced thermal stress in the steel sheet compared to the test specimens CC and AA, and even in the test specimen ACA, the thermal stress generated in the steel sheet. Can be reduced to the same level as the test sample ACA. According to the above test results, as a method of reducing the thermal stress of the steel plate, in the method according to the present invention in which the CFRP plates 1 and the AL plates 10 are alternately arranged and bonded, the temperature change test at 20 ° C ± 30 ° C is performed, It became clear that the thermal stress which arises in a steel plate can be reduced.

  As has become apparent from the above test examples, according to the steel structure reinforcing method of the present invention and the laminated material for steel structure reinforcement, the thermal stress generated in the steel material due to temperature change is reduced, A sufficient reinforcing effect can be obtained.

1 Reinforcing fiber-containing material (fiber sheet, fiber-reinforced resin plate)
10 Alloy materials (alloy plates, alloy bars)
100 Steel structure reinforcement (reinforced laminate)
110 Adhesive 200 Steel structure (steel material, steel plate)

Claims (18)

In a method of reinforcing a steel structure, the reinforcing material is adhered to the surface of a steel material constituting the steel structure with an adhesive.
The reinforcing material is composed of a reinforcing fiber-containing material having a smaller linear expansion coefficient than the steel material constituting the steel structure, and an alloy material having a larger linear expansion coefficient than the steel material,
On the surface of the steel material, the reinforcing fiber-containing material and the alloy material are alternately arranged in the lateral direction along the surface of the steel material and bonded with an adhesive, and the thermal stress generated in the steel material due to the temperature change of the steel material. A method of reinforcing a steel structure, characterized by reducing. In a method of reinforcing a steel structure, the reinforcing material is adhered to the surface of a steel material constituting the steel structure with an adhesive.
The reinforcing material is a sheet-like material in which a reinforcing fiber-containing material having a smaller linear expansion coefficient than that of the steel material constituting the steel structure and an alloy material having a larger linear expansion coefficient than that of the steel material are alternately arranged laterally along the surface of the steel material. To be integrally formed,
A method for reinforcing a steel structure, comprising: bonding the sheet-like reinforcing material to the surface of the steel material with an adhesive to reduce thermal stress generated in the steel material due to a temperature change of the steel material.   The method for reinforcing a steel structure according to claim 1 or 2, wherein the reinforcing material is bonded to a surface of the steel material in a plurality of layers.   The reinforcement of a steel structure according to any one of claims 1 to 3, wherein the reinforcing fiber-containing material and the alloy material have a plate shape or a rod shape extending in a longitudinal direction of the steel material. Method.   The linear expansion coefficient (αs) of the steel material is 10 (μ / ° C.) ≦ αs ≦ 18 (μ / ° C.), and the linear expansion coefficient (αf) of the reinforcing fiber-containing material bonded to the steel material is − The method according to any one of claims 1 to 4, wherein 15 (μ / ° C) α αf <αs, and the linear expansion coefficient (αa) of the alloy material is αs <αa 30 30 (μ / ° C). The reinforcement method of the steel structure as described in ,.   The method for reinforcing a steel structure according to any one of claims 1 to 5, wherein the reinforcing fiber-containing material is produced by aligning continuous reinforcing fibers in one direction.   The reinforcing fiber-containing material is produced by aligning a plurality of continuous fiber-reinforced plastic wires cured by impregnating a reinforcing resin with a matrix resin, and forming a plurality of continuous fiber-reinforced plastic wires in a longitudinal direction in the form of a sag. 5. The method for reinforcing a steel structure according to any one of items 5 to 6.   The said reinforced fiber containing material is a fiber reinforced resin in which resin was impregnated in the continuous reinforced fiber sheet which aligned in one direction, and the said resin was hardened | cured. The reinforcement method of the steel structure as described in.   The said alloy material is an aluminum alloy, a stainless steel alloy, or a magnesium alloy, The reinforcement method of the steel structure as described in any one of Claims 1-8 characterized by the above-mentioned. The reinforcing fibers of the reinforcing fiber-containing material are inorganic fibers such as carbon fibers, glass fibers and basalt fibers, or organic fibers such as aramid, PBO (polyparaphenylene benzbisoxazole), polyamide, polyarylate, and polyester. Or mixed with multiple types and used in hybrid,
The matrix resin impregnated in the reinforcing fiber-containing material and the adhesive are heat-curable epoxy resin, vinyl ester resin, MMA resin, acrylic resin, unsaturated polyester resin, phenol resin, etc. The method for reinforcing a steel structure according to any one of claims 1 to 9, wherein the method is a curable resin or a thermoplastic resin such as nylon or vinylon. A steel structure reinforcing laminate for reinforcing a steel structure by bonding with an adhesive to the surface of the steel material constituting the steel structure,
Reinforced fiber-containing material having a smaller linear expansion coefficient than that of the steel constituting the steel structure and an alloy material having a larger linear expansion coefficient than that of the steel are alternately arranged in the lateral direction along the surface of the steel, and are held in a sheet form to be integrated. The laminated material for steel structure reinforcement characterized by being formed into.   The steel structure reinforcing laminate according to claim 11, wherein the reinforcing fiber-containing material and the alloy material are in the form of a plate or a rod extending in the longitudinal direction of the steel material.   The linear expansion coefficient (αs) of the steel material is 10 (μ / ° C.) ≦ αs ≦ 18 (μ / ° C.), and the linear expansion coefficient (αf) of the reinforcing fiber-containing material bonded to the steel material is − The method according to claim 11 or 12, wherein 15 (μ / ° C) α αf <αs, and the linear expansion coefficient (αa) of the alloy material is αs <αa 30 30 (μ / ° C). Laminated material for steel structure reinforcement.   The steel structure reinforcing laminate according to any one of claims 11 to 13, wherein the reinforcing fiber-containing material is produced by aligning continuous reinforcing fibers in one direction.   The said reinforcing fiber containing material is characterized in that a reinforcing fiber is impregnated with a matrix resin, and a plurality of cured continuous fiber-reinforced plastic wires are produced in a longitudinal direction so as to be aligned in a streak shape. The laminated material for steel structure reinforcement as described in any one of 13.   The said reinforcement fiber containing material is a fiber reinforced resin in which resin was impregnated in the continuous reinforcement fiber sheet which aligned in one direction, and the said resin was hardened | cured, The said material is characterized by the above-mentioned. The laminated material for steel structure reinforcement as described in-.   The laminated material for reinforcing a steel structure according to any one of claims 11 to 16, wherein the alloy material is an aluminum alloy, a stainless alloy, or a magnesium alloy. The reinforcing fibers of the reinforcing fiber-containing material are inorganic fibers such as carbon fibers, glass fibers and basalt fibers, or organic fibers such as aramid, PBO (polyparaphenylene benzbisoxazole), polyamide, polyarylate, and polyester. Or mixed with multiple types and used in hybrid,
The matrix resin impregnated in the reinforcing fiber-containing material and the adhesive are heat-curable epoxy resin, vinyl ester resin, MMA resin, acrylic resin, unsaturated polyester resin, phenol resin, etc. The laminated material for reinforcing steel structures according to any one of claims 11 to 17, which is a curable resin or a thermoplastic resin such as nylon or vinylon.

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