JP2021167174A - Complex - Google Patents

Abstract

To provide a complex with metal structural element and fiber-reinforced resin reinforcement member, capable of ensuring rigidity to both of tension and torsion.SOLUTION: Longitudinal metal structural elements FP, CP, RP, RS, CL include a top plate part 1 and a pair of side plate parts 2. A fiber-reinforced resin reinforcement member joined to the structural element includes a tape-like first reinforcement member R arranged along the longitudinal direction of the structural element with continuous reinforced fiber orientated in the longitudinal direction and a second reinforcement member R2 arranged in a local range of the structural element with a discontinuous reinforced fiber orientated in a multiple direction. On the top plate part 1 of the structural element, a first reinforcement member R1 which contacts the side plate part 2 is arranged and the second reinforcement member R2 which contacts the first reinforcement member R1 is arranged in a local range including corner parts K of the structural elements in intersection areas C1-C6 to form a complex A. It is thus possible to ensure rigidity against tension and torsion.SELECTED DRAWING: Figure 1

Description

The present invention relates to a composite structure including a plurality of elongated metal structural elements and a reinforcing member made of fiber reinforced resin bonded to the structural elements, and is suitable for use in an automobile body panel or the like. It relates to a composite structure.

As a conventional composite structure, for example, there is one described in Patent Document 1. The composite structure described in Patent Document 1 is a partition panel for a vehicle, and is formed of a panel portion formed of a composite material for partitioning the trunk and the inside of the vehicle, and a composite material inclined upward from the lower center of the panel portion. It is equipped with a reinforced part. The reinforcing portion is a tape-shaped composite material in which continuous reinforcing fibers are oriented in the longitudinal direction.

US 2018/0111647 A1

However, in the case of the composite structure as described above, for example, when a frame shape having an opening is formed and an external load is assumed, such as a body side panel of an automobile, both tension and torsion are expected. Rigidity is required. For this reason, a conventional composite structure that simply employs a tape-shaped reinforcing portion is advantageous for weight reduction, but it is difficult to secure sufficient rigidity.

The present invention has been made in view of the above-mentioned conventional situation, and is used for tensioning and twisting in a composite structure including a plurality of metal structural elements and a reinforcing member made of fiber reinforced resin bonded to the structural elements. It is an object of the present invention to provide a composite structure which can secure rigidity for both of the above and is suitable for use in a body panel of an automobile or the like.

The composite structure according to the present invention has a structure in which a plurality of elongated metal structural elements are arranged on the same surface and two adjacent structural elements are integrated in an intersecting region, and the structural elements are integrated. It has a structure in which a reinforcing member made of fiber reinforced resin is joined to. The structural element includes a top plate portion along the same surface and a pair of side plate portions extending from both ends of the top plate portion to the same side in a cross section intersecting in the longitudinal direction. The reinforcing members are a tape-shaped first reinforcing member in which continuous reinforcing fibers are oriented in the longitudinal direction and arranged along the longitudinal direction of the structural element, and a discontinuous reinforcing fiber is oriented in multiple directions and a local part of the structural element. It is provided with a second reinforcing member to be arranged in the range. Then, in the composite structure, the first reinforcing member is arranged on the top plate portion of the structural element in a state of being in contact with the side plate portion, and the second reinforcing member is placed in a local range including the corner portion between the structural elements in the intersecting region. 1 It is characterized in that it is arranged in contact with the reinforcing member.
In the above configuration, the long structural element is not only a member having the same cross section continuous like a profile, but also a general long member and various types of members capable of specifying the longitudinal direction.

By adopting the above configuration, the composite structure according to the present invention is a composite structure provided with a plurality of metal structural elements and a reinforcing member made of fiber reinforced resin bonded to the structural elements, and is tensioned and twisted. It is possible to secure the rigidity for both of the above, and it is suitable for use in the body panel of an automobile or the like.

It is a front view explaining one Embodiment of the composite structure which concerns on this invention. A front view (A) for explaining the structural elements, a cross-sectional view (B) based on the arrow I-I in FIG. A, a cross-sectional view (C) based on the arrow II-II in FIG. A, and FIG. A. It is a cross-sectional view (D) based on the arrow III-III inside. A front view (A) for explaining the structural element in which the first reinforcing member is arranged, a cross-sectional view (B) based on the line arrow I-I in FIG. A, and a cross-sectional view based on the line arrow II-II in FIG. (C) and a cross-sectional view (D) based on the arrow line III-III in FIG. A. Sectional view (A) based on line I-I arrow in FIG. 1, sectional view (B) based on line arrow II-II, sectional view (C) based on line arrow III-III, line IV-IV. It is a cross-sectional view (D) based on the arrow view and the cross-sectional view (E) based on the VV line arrow view.

1 to 4 are views for explaining an embodiment of the composite structure according to the present invention.
That is, the composite structure has a structure in which a plurality of elongated metal structural elements are arranged on the same surface and two adjacent structural elements are integrated at an intersection region, and the structural elements are made of fibers. It has a structure in which reinforcing members made of reinforced resin are joined.

The plurality of structural elements have a structure in which they are arranged on the same surface and integrated, and form a two-dimensional frame shape having an opening as a whole. The intersecting region is a region common to two adjacent structural elements and can be interpreted as a part of the structural elements, but for convenience of explaining the arrangement of the reinforcing members, it will be described as one constituent part.

More specifically, the composite structure A illustrated in FIG. 1 is an automobile body panel. FIG. 1 is a front view of the body panel constituting the right side of the vehicle body as viewed from the inside of the vehicle body.

The components of the composite structure A shown in the figure are a front pillar portion FP, a center pillar portion CP, and a rear pillar portion RP whose longitudinal direction is the vertical direction in the body panel.

Similarly, the structural elements are the roof side RS portion and the sill portion CL that connect the upper ends and the lower ends of the front pillar portion FP, the center pillar portion CP, and the rear pillar portion RP, respectively, with the front-rear direction as the longitudinal direction in the body panel.

Then, the composite structure (body side panel) A forms a front opening FO and a rear opening RO for attaching the front door and the rear door between the structural elements, and the two opening FOs as a whole are formed. It has a frame shape with RO.

In the composite structure A shown in the figure, the intersection region between two adjacent structural elements is the front upper intersection region C1 that integrates the upper end of the front pillar portion FP and the front end of the roof side portion RS, and the lower end of the front pillar portion FP. This is a front lower intersection region C2 that integrates the sill portion CL with the front end of the sill portion CL. As a result, the front pillar portion FP, the roof side portion RS, and the sill portion CL are substantially integrated into an L-shape.

Similarly, the intersection region is the center upper intersection region C3 that integrates the upper end of the center pillar portion CP and the middle of the roof side portion RS, and the lower center that integrates the lower end of the center pillar portion CP and the middle of the sill portion CL. It is a side intersection region C4. As a result, the center pillar portion CP, the roof side portion RS, and the sill portion CL are substantially integrated into a T-shape, respectively.

Further, the intersection region is also the rear upper intersection region C5 that integrates the upper end of the rear pillar portion RP and the rear end of the roof side portion RS, and the lower rear that integrates the lower end of the rear pillar portion RP and the rear end of the sill portion CL. It is a side intersection region C6. As a result, the rear pillar portion RP, the roof side portion RS, and the sill portion CL are substantially integrated into an L-shape.

Of the above structural elements, the center pillar portion CP, the roof side portion RS, and the sill portion CL have the same planes (planes on which the respective structural elements are arranged) in the cross section intersecting in the longitudinal direction, as shown in FIG. ), And a pair of side plate portions 2 and 2 extending from both ends of the top plate portion 1 on the same side and in parallel with each other. The side plate portions 2 and 2 extend at a predetermined angle with respect to the top plate portion 1, and may not be parallel to each other. As a result, the center pillar portion CP, the roof side portion RS, and the sill portion CL have a cross-sectional shape that is open to the inside of the vehicle body.

Further, among the structural elements, the front pillar portion FP and the rear pillar portion RP also have a top plate portion 1 and a side plate portion 2. The side plate portions 2 of the front pillar portion FP and the rear pillar portion RP may be provided only on the front and rear openings FO and RO sides.

In the composite structure A, the material of the metal structural element is not limited, but as an example, it is an aluminum alloy that is advantageous for weight reduction, and for example, one blank material is pressed. Therefore, it is possible to form a structure in which a plurality of long metal structural elements are integrated at an intersecting region.

The reinforcing member includes a tape-shaped first reinforcing member R1 in which continuous reinforcing fibers are oriented in the longitudinal direction, and a second reinforcing member R2 in which discontinuous reinforcing fibers are oriented in multiple directions. The material of the reinforcing member is not limited, but a preferred example thereof is a thermoplastic resin (CFRTP) in which carbon fiber is used as the reinforcing fiber.

The first reinforcing member R1 is formed in the form of a tape having a predetermined width and thickness by aligning a large number of continuous reinforcing fibers in one direction and impregnating the resin, and is suitable according to the required strength. Several sheets may be stacked and arranged. By arranging the first reinforcing member R1 along the longitudinal direction of the structural element, the orientation of the reinforcing fibers is aligned with the longitudinal direction of the structural element.

On the other hand, in the second reinforcing member R2, the reinforcing fibers are oriented in multiple directions by impregnating the resin with a large number of discontinuous reinforcing fibers (short fibers). The second reinforcing member R2 can be formed by, for example, heat welding lamination, and the lamination height and range can be determined according to the required strength. The second reinforcing member R2 can also be molded by injection molding or resin press molding. The second reinforcing member R2 is arranged in a local range of the structural element including the intersecting region.

Then, in the composite structure A, the first reinforcing member R1 is arranged on the top plate portion 1 of the structural elements (FP, CP, RP, RS, CL) in a state of being in contact with the side plate portion 2, and the intersecting regions C1 to C6 The second reinforcing member R2 is arranged in a state of being in contact with the first reinforcing member R1 in a local range including the corner portion K between the structural elements in the above.

As a more preferable embodiment, the composite structure A may adopt a configuration in which the second reinforcing member R2 is in contact with the first reinforcing member R1 in a state of partially covering the first reinforcing member R1. In this case, as shown in FIG. 3, the reinforcing member R1 is arranged first.

The first reinforcing member R1 may be arranged so as to cover the entire surface of the top plate portion 1 in the structural element so as to be in contact with the side plate portions 2 and 2 on both sides. It is placed only on both ends. That is, the composite structure A is attached to the top plate portion 1 so as shown in FIGS. 3 (B) to 3 (D) the cross sections of the roof side portion RS, the center pillar portion CP, and the sill portion CL, which are structural elements. The two first reinforcing members R1 and R1 are arranged so as to be separated from each other. At this time, one first reinforcing member R1 is in contact with one side plate portion 2, and the other first reinforcing member R1 is in contact with the other side plate portion 2. Although not shown, the first reinforcing member R1 may be arranged on the front pillar portion FP and the rear pillar portion RP, which are structural elements.

As a more preferable embodiment, the composite structure A may adopt a configuration in which the first reinforcing member R1 is continuously arranged in the intersecting region. Further, as a more preferable embodiment, the composite structure A may adopt a configuration in which the first reinforcing members R1 of two adjacent structural elements intersect each other in the intersecting region.

In the composite structure A, as shown in FIG. 3A, the upper ends of the first reinforcing members R1 and R1 of the center pillar portion CP are continuous with the center upper crossing region C3, and the upper side plate of the roof side portion RS is formed. It is also in contact with part 2. Further, the lower ends of the first reinforcing members R1 and R1 of the center pillar portion CP are in contact with the lower side plate portion 2 of the sill portion CL in succession to the center lower crossing region C4.

Further, in the composite structure A, as also shown in FIG. 3A, the first reinforcing members R1 and R1 of the roof side portion RS are moved from the front end of the roof side portion RS to the rear end via the center upper crossing region C3. It is continuous throughout the longitudinal direction. Further, in the composite structure A, the first reinforcing members R1 and R1 of the sill portion CL are continuous over the entire longitudinal direction from the front end of the sill portion CL through the lower center crossing region C4 to the rear end.

Then, in the composite structure A, as also shown in FIG. 3A, the first reinforcing member R1 of the center pillar portion CP and the first reinforcing member R1 of the roof side portion RS intersect with each other in the center upper crossing region C3. doing. Further, in the composite structure A, the first reinforcing member R1 of the center pillar portion CP and the first reinforcing member R1 of the sill portion CL intersect in the lower center crossing region C4.

Here, the composite structure A is a suitable embodiment for the body side panel, particularly in the center lower crossing region C4, with respect to the first reinforcing members R1 and R1 arranged on the top plate portion 1 of the sill portion CL. , The first reinforcing members R1 and R1 arranged on the top plate portion 1 of the center pillar portion CP ride on and intersect.

Further, as a more preferable embodiment, the composite structure A contacts the second reinforcing member R2 from one side plate portion 2 to the other side plate portion 2 with the first reinforcing member R1 in a local range in the intermediate portion of the structural element. A configuration arranged in a state can be adopted.

As shown in FIGS. 1 and 4 (A) to 4 (C), the composite structure A of this embodiment corresponds to the intermediate portion of the center pillar portion CP, the roof side portion RS, and the front opening FO of the sill portion CL. A second from one side plate 2 to the other side plate 2 in each local range in the middle of the range to be used and in the middle of the range corresponding to the rear opening RO of the roof side portion RS and the sill portion CL. Reinforcing member R2 is arranged. These second reinforcing members R2 are in contact with two first reinforcing members R1 and R1 arranged in the center pillar portion CP, the roof side portion RS, and the sill portion CL, respectively.

Further, as described above, the composite structure A has a structure in which two adjacent structural elements are substantially integrated into a T-shape or an L-shape, and as a more preferable embodiment, in an intersecting region. It is possible to adopt a configuration in which the second reinforcing member R2 is arranged in a plurality of local ranges and the second reinforcing member R2 is continuous at least in a part thereof.

In the composite structure A of this embodiment, in the front upper crossing region C1 and the front lower crossing region C2, the second reinforcing member R2 is arranged in a local range including the corner portion K, respectively. Further, in the composite structure A, in the rear upper crossing region C5 and the rear lower crossing region C6, the second reinforcing member R2 is arranged in a local range including the corner portion K, respectively.

Further, as shown in FIGS. 1 and 4 (D), the composite structure A has two corners K and K in the center upper crossing region C3, and therefore includes the respective corners K and K. The second reinforcing member R2 is arranged at three positions, one local range and the local range including the first reinforcing member R1 on the upper side of the roof side portion RS. Then, in the composite structure A, the second reinforcing members R2 arranged in the above three local ranges are partially continuous with each other. These continuous portions are formed by the same second reinforcing member R2.

In the illustrated example, in the center upper crossing region C3, the two first reinforcing members R1 of the center pillar portion CP and the lower first reinforcing member R1 of the roof side portion RS are covered with each other and the two adjacent second reinforcing members are adjacent to each other. The second reinforcing member R2 in each local range is made continuous by the second reinforcing member R2 arranged so as to span between R2 and R2.

Further, as shown in FIGS. 1 and 4 (E), the composite structure A has two corner portions K and K in the center lower intersection region C4, similarly to the center upper intersection region C3. The second reinforcing member R2 is arranged at three locations, the local range and the local range including the first reinforcing member R1 on the lower side of the sill portion CL, and these second reinforcing members R2 are continuous with each other. .. The continuous portion is formed by a second reinforcing member R2 arranged in the same manner as the center upper crossing region C3.

The second reinforcing member R2 may be arranged so as to cover the entire center upper crossing region C3 and the center lower crossing region C4, and may be integrated in a plurality of local ranges. Although it is possible, it is more desirable to determine the form of arrangement in consideration of the required strength and weight, the yield of the material, the manufacturing cost, and the like.

In the composite structure A having the above structure, the structural element has a cross-sectional shape opened on one side by the top plate portion 1 and the pair of side plate portions 2 and 2, and the reinforcing member has continuous reinforcing fibers in the longitudinal direction. It has a tape-shaped first reinforcing member R1 oriented in a direction, and a second reinforcing member R2 in which discontinuous reinforcing fibers are oriented in multiple directions.

In the composite structure A, the first reinforcing member R1 is arranged along the longitudinal direction of the top plate portion 1 of the structural element (FP, CP, RP, RS, DL) in the longitudinal direction of the structural element. And the orientation of the continuous reinforcing fibers are in agreement. As a result, the composite structure A secures sufficient rigidity against tension in the longitudinal direction of the structural element, and further, by keeping the first reinforcing member R1 in contact with the side plate portion 2 of the structural element, the structural element Ensure rigidity against twisting.

Further, the composite structure A is arranged in a local range including the corners K between the structural elements in the intersecting regions C1 to C6 by arranging the second reinforcing member R2 in contact with the first reinforcing member R1 to form an intersecting region. When a load is applied to C1 to C6 from an unspecified direction, the rigidity against the bending stress generated by the load can be increased.

Further, the composite structure A has a structure in which a plurality of structural elements are arranged on the same surface and integrated, and forms a two-dimensional frame shape having an opening as a whole. Twisting is likely to occur. Therefore, in the composite structure A, the first reinforcing member R1 in which continuous reinforcing fibers are oriented in one direction and arranged in the longitudinal direction of the structural element, and the discontinuous reinforcing fibers are arranged in multiple directions and arranged in a local range. By adopting the second reinforcing member R2, the rigidity of the entire structure against torsion is ensured.

In this way, the composite structure A includes a plurality of metal structural elements (FP, CP, RP, RS, DL) and first and second reinforcing members R1 which are reinforcing members made of fiber reinforced resin. By configuring with R2 and R2, it is possible to secure rigidity against both tension and torsion while realizing weight reduction.

Further, in the composite structure A, since the first and second reinforcing members R1 and R2 are arranged at necessary parts, the material yield is good, the productivity is improved, the manufacturing cost is reduced, and the weight is reduced. It can contribute to the conversion.

Such a composite structure A is very suitable for use in a body panel of an automobile, as it has a frame shape having an opening and is expected to be loaded from the outside. In other words, it is possible to provide an automobile body panel having sufficient rigidity against both tension and torsion.

When the composite structure A is applied to the body panel, the top plate portion of the center pillar portion CP is compared with the first reinforcing member R1 arranged on the top plate portion 2 of the sill portion CL in the center lower intersection region C4. The first reinforcing member R1 arranged in 1 rides on and intersects. As a result, in the body side panel, the continuous reinforcing fibers of the first reinforcing member R1 arranged in the sill portion Cl are in a state of being oriented over the entire length of the sill portion CL without bending, and the second reinforcing member R2 is added thereto. , Sufficient rigidity of the center lower intersection region C4 can be obtained, and sufficient strength to withstand a side collision can be secured.

Further, the composite structure A is in contact with the first reinforcing member R1 in a state where the second reinforcing member R2 partially covers the first reinforcing member R1. As a result, in the composite structure A, the first reinforcing member R1 is arranged with respect to the structural element to prevent the continuous reinforcing fibers of the first reinforcing member R1 from bending as much as possible, and to further enhance the rigidity secured by the reinforcing fibers. be able to.

Further, in the composite structure A, a second reinforcing member R2 extending from one side plate portion 2 to the other side plate portion 2 is arranged in a local range in the intermediate portion of the structural element in a state of being in contact with the first reinforcing member R1. There is. As a result, in the composite structure A, the strength of the first reinforcing member R1 in which the continuous reinforcing fibers are oriented is secured by the second reinforcing member R2 in the direction intersecting the orientation, and the amount of the reinforcing member used is increased. Rigidity against both tension and torsion can be ensured to the minimum necessary.

Further, the composite structure A has a structure in which two adjacent structural elements are integrated into a T-shape or an L-shape, and is second in a plurality of local ranges in the intersecting regions (C1 to C6). Along with arranging the reinforcing member R2, each second reinforcing member R2 is continuous at least in a part. As a result, in the composite structure A, the first reinforcing member R1 can be reinforced by the second reinforcing member R2 when a complicated force of tension, bending, and shearing is applied to the intersecting region, and the reinforcing member can be reinforced. Rigidity against both tension and torsion can be ensured by minimizing the amount used.

Further, in the composite structure A, the first reinforcing member R1 is continuously arranged in the intersecting regions C1 to C6. As a result, the composite structure A has a structure in which the first reinforcing member R1 is arranged over the entire length of each structural element (FP, CP, RP, RS, DL), and has rigidity against both tensile and torsional in the longitudinal direction. Can be reliably maintained.

Further, in the composite structure A, the first reinforcing members R1 of the two structural elements intersect each other in the intersecting regions C1 to C6. As a result, the composite structure A can secure the rigidity of each structural element against tension and torsion even when a force in an unspecified direction acts on the intersecting region.

Further, in the composite structure A, two first reinforcing members R1 and R1 are arranged on the top plate portion 1 in a state of being separated from each other in a cross section intersecting the longitudinal direction of the structural element, and one of the first reinforcing members is arranged. The structure is such that R1 is in contact with one side plate portion 2 and the other first reinforcing member R1 is in contact with the other side plate portion 2. As a result, the composite structure A can secure the rigidity of the structural element against tension and torsion by minimizing the amount of the first reinforcing member R1 used.

The composite structure according to the present invention is not limited to the above-described embodiment shown in FIGS. 1 to 4, and can be appropriately modified without departing from the gist of the present invention. That is, the composite structure is naturally applicable to other than the body side panel of the automobile, and the number and arrangement of structural elements and the arrangement number and arrangement range of the first and second reinforcing members can be appropriately changed. be.

A composite structure (body side panel)
CL sill part (structural element)
CP center pillar (structural element)
FP front pillar (structural element)
RP rear pillar part (structural element)
RS roof side part (structural element)
C1 Front upper crossing area C2 Front lower crossing area C3 Center upper crossing area C4 Center lower crossing area C5 Rear upper crossing area C6 Rear lower crossing area K Corner R1 First reinforcing member R2 Second reinforcing member 1 Top plate 2 Side plate

Claims (9)

A plurality of elongated metal structural elements are arranged on the same surface to have a structure in which two adjacent structural elements are integrated at an intersecting region, and the structural elements are reinforced with fiber reinforced resin. A composite structure having a structure in which members are joined,
In a cross section in which the structural elements intersect in the longitudinal direction, a top plate portion along the same surface and a pair of side plate portions extending from both ends of the top plate portion to the same side are provided.
The reinforcing member has a tape-shaped first reinforcing member in which continuous reinforcing fibers are oriented in the longitudinal direction and arranged along the longitudinal direction of the structural element, and a discontinuous reinforcing fiber is oriented in multiple directions and the structure. Equipped with a second reinforcing member to be placed in the local range of the element
The first reinforcing member is arranged on the top plate portion of the structural element in a state of being in contact with the side plate portion, and the second reinforcing member is placed in a local range including a corner portion between the structural elements in the intersecting region. A composite structure characterized in that it is arranged in contact with the first reinforcing member. The composite structure according to claim 1, wherein the second reinforcing member is in contact with the first reinforcing member in a state of partially covering the first reinforcing member. Claim 1 or 2 is characterized in that a second reinforcing member extending from one side plate portion to the other side plate portion is arranged in a local range in an intermediate portion of the structural element in a state of being in contact with the first reinforcing member. The composite structure described in. The two adjacent structural elements have a structure integrated into a T-shape or an L-shape.
Any one of claims 1 to 3, wherein the second reinforcing member is arranged in a plurality of local ranges in the intersecting region, and each of the second reinforcing members is continuous at least in a part thereof. The composite structure described in the section. The composite structure according to any one of claims 1 to 4, wherein the first reinforcing member is continuously arranged in the intersecting region. The composite structure according to claim 5, wherein the first reinforcing members of two adjacent structural elements intersect each other in the intersecting region. In a cross section intersecting the longitudinal direction of the structural element, two first reinforcing members are arranged on the top plate portion in a state of being separated from each other, and one of the first reinforcing members is in contact with one of the side plate portions. The composite structure according to claim 1 to 6, wherein the other first reinforcing member is in contact with the other side plate portion. The structural element
The front pillar portion, the center pillar portion, and the rear pillar portion having the vertical direction as the longitudinal direction in the body panel of the automobile, and the front pillar portion, the center pillar portion, and the rear pillar portion having the front-rear direction as the longitudinal direction in the body panel. It is a roof side part and a sill part that connect the upper end and the lower end of the
The intersection area
A front upper intersection area that integrates the upper end of the front pillar portion and the front end of the roof side portion.
A front lower intersection area that integrates the lower end of the front pillar portion and the front end of the sill portion.
A center upper intersection area that integrates the upper end of the center pillar portion and the middle of the roof side portion.
A center lower intersection region that integrates the lower end of the center pillar portion and the middle of the sill portion,
Rear upper crossing region that integrates the upper end of the rear pillar portion and the rear end of the roof side portion,
The composite structure according to any one of claims 1 to 7, wherein the lower end of the rear pillar portion and the rear end of the sill portion are integrated with each other. In the center lower intersection region, the first reinforcing member arranged on the top plate portion of the center pillar portion rides on and intersects with the first reinforcing member arranged on the top plate portion of the sill portion. The composite structure according to claim 8, wherein the composite structure is characterized by the above.

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