JP2739550B2 - Truss roof structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001] The present invention relates to a truss roof structure forming a large span frame, and more particularly to a truss roof structure reinforced with a tension member such as a cable.

[0002]

2. Description of the Related Art Conventionally, construction of a three-dimensional structure has been carried out in the form of a public
As described in Japanese Patent Application Laid-Open No. 3-27364, a plurality of piano wires are tensioned along the inside of a main beam main body formed in an arch shape, and an end of each piano wire is attached to the main beam main body. As described in Japanese Patent Publication No. 49-19569, a wire is tensioned along an arc-shaped truss body assembled by connecting a plurality of Z-shaped truss members. An arc-shaped truss or the like in which an end of a wire is fixed to an end of the truss body is used. In recent years, a stringed beam structure in which a bundle and a cable are arranged so as to reduce the stress of a beam member is often used.

When a live load such as wind or snow is applied to a three-dimensional structure, a piano wire or a wire is tensioned in an arch-shaped main beam or an arc-shaped truss, and a lower chord cable is tensioned in a beam string. As shown by the one-dot chain line in FIG. 2, the buckling load is increased as compared with the case where there is no tendon (shown by the two-dot chain line in the same figure), so that the rigidity of the three-dimensional structure can be increased. .

[0004]

However, in the above conventional structure, the tension member is always in tension even when no live load is applied to the three-dimensional structure. It is not possible to make maximum use of the proof stress of the framing members constituting the skeleton, and therefore, when the ultimate proof strength of the three-dimensional structure is considered, there is a problem that the deformability of the structure is reduced. .

In the case of the arch-shaped main beam, the arc-shaped truss, and the like, a predetermined tension is introduced by a piano wire, a wire, or the like when constructing a three-dimensional structure. Also, in the case of the beam string, tension is introduced into the lower chord cable during construction of the three-dimensional structure. For this reason, when constructing a three-dimensional structure with a beam string structure, it is necessary to introduce tension with great care including tension management, and also the procedure, amount (tensile amount) and method of introducing tension. There is a danger of a work accident if a mistake is made, so considerable experience and skill are required to introduce the tension. Further, since it is inevitable that the lower chord cable extends in several years after construction, it is necessary to re-tension the lower chord cable after the construction of the three-dimensional structure.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to make it possible to carry out the construction without the need for difficult tension management of a tendon and a special construction technique, and to further increase the improvement of the yield strength. It is to provide a three-dimensional structure that can be used.

[0007]

In order to achieve the above object, according to the present invention, a tendon is formed into a polygon inside a frame member constituting a frame of a roof structure constructed on a foundation. A plurality of continuous polyhedrons are assembled, the intersections of the polygons are connected to the contact points of the frame members, and the ends of the tendons constituting the outer periphery of the polyhedron are attached to the outer periphery of the roof structure. Only when the roof structure is deformed due to uneven loading of the live load, the polyhedral tendon is tensioned to suppress the deformation of the roof structure.

[0008]

According to the above construction, when a live load is imbalanced on a roof structure constructed on a foundation, the deformation of the roof structure is appropriately suppressed at the load imbalance portion, and the deformed portion of the roof structure is reduced. While effectively acting the skeleton member in the above, the tension member at the deformed portion is tensioned, and the deformation mode of the roof structure is suppressed by suppressing a certain or more deformation, and the buckling mode of the skeleton member is changed, The buckling resistance of the frame member is further increased.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1A is a plan view showing a truss roof structure according to a first embodiment of the present invention in which a live load is not applied and a shape is maintained by the weight of the structure itself.
(2) is a front view of the truss roof structure, and FIG.
(2) and (3) are schematic front views showing examples of deformation modes of the truss roof structure shown in FIG. 1, (4) is a plan view of (3), and FIG. 3 is a skeleton in the truss roof structure. FIG. 4 is a schematic diagram showing an example of a buckling mode of a member, and FIG. 4 is a characteristic curve diagram showing a relationship between load and deformation.

In FIG. 1, reference numeral 1 denotes a dome constructed on a foundation 2 (including a frame), and an outer peripheral portion 1a of the dome 1 is fixedly supported on the foundation 2. The dome 1 has a structure in which a plurality of frame members 3 are assembled in a rectangular mesh.

Reference numeral 4 denotes a polyhedron, and the polyhedron 4 has a plurality of cables 5 constituting a tension member formed in a polygon 4a (a rectangle in the embodiment) and connected in series to form a larger polygon. The triangle 4b is connected to one side of the polygon 4a that forms each side of the polygon.

The polyhedron 4 is a frame member 3 of the dome 1.
And each polygon 4 in the polyhedron 4
The side of “a” is obliquely stretched with respect to the frame member 3 of the dome 1. The intersection 4c of the polygon 4a is connected to the contact point of the frame member 3, and the end 5a of the cable 5 constituting the outer periphery of the polyhedron 4 is fixed to the outer periphery 1a of the dome 1.

The dome 1 is formed by such a polyhedron 4.
Is stiffened from the inside.

According to the above configuration, when a live load such as wind or snow is imbalanced on the dome 1, various deformation modes as shown in FIGS. 2 (1), (2) and (3) occur. In such a case, the deformation of the dome 1 is appropriately suppressed at the unbalanced portion of the load, the skeleton member 3 at the deformed portion of the dome 1 is effectively operated, and the cable 5 at the deformed portion is effectively used.
Nervous.

The tension of the cable 5 causes the dome 1
The deformation mode is changed by suppressing the deformation of a certain degree or more, and the buckling mode of the frame member 3 is changed from the one-dot chain line to the two-dot chain line as shown in FIG. Can be raised.

In this case, as shown by a solid line in FIG.
The buckling force of the skeleton member 3 is utilized up to the peak, compared with the conventional case where the tension member indicated by the one-dot chain line is always tensioned, and the proof stress of the skeleton member 3 is maximized. In addition, the deformation capacity of the dome 1 is increased due to the increase in the proof strength of the cable 5, and the proof strength is also increased by 20 to 30% or more.

In the first embodiment, four cables 5 are formed in a polygon 4a inside the frame member 3, and four cables 5 are connected in series.
A polyhedron 4 formed by connecting triangles 4b to the outer periphery thereof is assembled, intersections 4c of the polygons 4a are connected to contact points of the frame member 3, and a cable 5 constituting an outer peripheral portion (triangle 4b) of the polyhedron 4 is formed. Although the end 5a is fixed to the outer peripheral portion 1a of the dome 1, the polyhedron 4A shown in FIGS.
In the polyhedron 4B shown in (1) and (2), nine polygons 4a having different sizes are used, and the polyhedron 4C shown in FIGS.
Then, the number of polygons 4a is changed to 16 and the number and size of polygons 4a are appropriately changed, and the end of the cable 5 is extended to the outside of the polyhedrons 4A, 4B, and 4C.
The end 5a of the cable 5 that constitutes the outer periphery of A, 4B, 4C may be fixed to the outer periphery 1a of the dome 1.

Further, in the above embodiment, the mesh formed by the frame member 3 is rectangular, but it is not limited to this, and it goes without saying that the mesh may be, for example, triangular or rhombic.

Further, in the above embodiment, the frame structure is a single-layer three-dimensional structure (single layer), but it is needless to say that the frame structure may be a multi-layer three-dimensional structure (double layer).

[0021]

As described above, according to the present invention, the inside of the framing member constituting the framing of the roof structure constructed on the foundation,
A polyhedron is formed by forming a plurality of tension members in a polygonal shape and a plurality of polyhedrons are connected to each other, an intersection of the polygons is connected to a contact point of the skeleton member, and an end portion of the tension member forming an outer peripheral portion of the polyhedron Is fixed to the outer periphery of the roof structure, and only when the roof structure is deformed due to uneven loading of the live load, the polyhedral tension member is strained to suppress the deformation of the roof structure. When the live load is imbalanced on the roof structure constructed in the above, the deformation of the roof structure is appropriately suppressed at the load imbalanced portion, the frame member at the deformed portion of the roof structure is effectively operated, and And the deformation mode is changed by suppressing the deformation of the roof structure over a certain level, and the buckling mode of the framing member is changed to maximize the buckling resistance of the framing member. And at the same time The yield strength in the gas can be increased 20-30% or more. These can be constructed without the need for tension management and special construction techniques, which are difficult as in the prior art, and can improve the overall strength of the roof structure.

[Brief description of the drawings]

FIG. 1A is a plan view showing a state where a live load has not yet been applied to a truss roof structure according to a first embodiment of the present invention. (2) It is a front view of the truss roof structure.

FIG. 2 (1) is a schematic front view showing an example of a deformation mode of the truss roof structure shown in FIG. (2) It is a schematic front view which shows the other example of the deformation mode of the truss roof structure. (3) It is a schematic front view which shows the other example of the deformation mode of the truss roof structure. (4) It is a top view of (3).

FIG. 3 is a schematic diagram showing an example of a buckling mode of a frame member in the truss roof structure shown in FIG.

FIG. 4 is a characteristic curve diagram showing a relationship between load and deformation.

FIG. 5 (1) is a plan view showing a state where a live load has not yet acted on the truss roof structure according to the second embodiment of the present invention. (2) It is a front view of the truss roof structure.

FIG. 6 (1) is a plan view showing a state where a live load has not yet acted on the truss roof structure according to the third embodiment of the present invention. (2) It is a front view of the truss roof structure.

FIG. 7A is a plan view showing a state where a live load has not yet acted on the truss roof structure according to the fourth embodiment of the present invention. (2) It is a front view of the truss roof structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dome (roof structure) 1a Outer peripheral part 2 Foundation 3 Frame member 4, 4A, 4B, 4C Polyhedron 4a Polygon 4c Intersection 5 Cable (tensile material) 5a End

Claims (1)

(57) [Claims] 1. A polyhedron having a plurality of tension members formed in a polygonal shape and formed in a plurality of polyhedrons is assembled inside a frame member constituting a frame of a roof structure constructed on a foundation, and an intersection of the polygons is formed. Is connected to the contact point of the frame member, and the end of the tendon member forming the outer peripheral portion of the polyhedron is fixed to the outer peripheral portion of the roof structure, and the roof structure is deformed due to uneven loading of live load. A trussed roof structure characterized in that the polyhedral tendon is tensioned only when the roof structure is deformed.