JPH111989A - Dome roof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enlarge the shaft force of a tension ring without enlarging bending moment acting on the tension ring and contrive lightweight by providing the tension ring for restricting the horizontal deformation of a truss on the outermost peripheral part of the truss, and constituting the tension ring out of a cable. SOLUTION: A curved face shell-shaped truss 11 constituted of a steel frame as a frame through a bearing 2 is attached to the upper part of a building 1, and a roof finish material 12 is attached to the upper part of the truss 11. A plurality of saddles 11a are provided on the bottom part of the truss 11, namely, on the outermost peripheral part of the truss 11 at prescribed intervals along the circumferential direction. A tension ring 13 composed of a plurality of cables 13a of very small bending rigidity making an annulus along the outermost peripheral part of the truss 11 is provided on the outer face side of these saddles 11a, and restricts horizontal deformation of the truss 11, namely, restrains deformation for the outside of the truss 11 by self weight of the truss 11, the roof finish material 12 and the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ball stadium, a stadium,
It relates to dome roofs installed in buildings such as theme parks and multipurpose facilities.

[0002]

2. Description of the Related Art A schematic structure of a conventional dome roof provided in a building such as a ballpark, a stadium, a theme park, and a multipurpose facility is shown in FIGS. As shown in FIGS. 8 and 9, a truss 51 having a curved shell shape formed of a steel frame as a skeleton is attached to the upper portion of the building 1 via a bearing 2. A roof finishing material 52 is attached to an upper portion of the truss 51. At the bottom of the truss 51, that is, at the outermost periphery of the truss 51, a box-shaped (or cylindrical) section having bending rigidity is provided.
The tension ring 53 restricts horizontal deformation of the truss 51, that is, restricts deformation of the truss 51 to the outside due to its own weight such as the truss 51 and the roof finishing material 52. It has become.

[0003]

In the dome roof as described above, the amount of deformation of the truss 51 due to its own weight such as the truss 51 and the roof finishing material 52 is suppressed, so that the truss 5
1 to reduce the amount of bending moment applied to
It has been studied to use a lightweight aggregate. However, since a large axial force is required for the tension ring 52 to suppress the amount of deformation of the truss 51, the cross-sectional size of the tension ring 53 must be increased. It is necessary to use a strong member for the tension ring 53 in consideration of bending rigidity. For this reason, the weight of the tension ring 53 becomes very large, and the whole construction cost including not only the dome roof but also the foundation becomes extremely high. Such a phenomenon becomes more conspicuous as the force required to suppress the deformation of the truss 51 increases, and thus becomes more problematic as the scale of the dome roof increases.

Accordingly, an object of the present invention is to provide a dome roof capable of increasing the axial force of the tension ring without increasing the bending moment acting on the tension ring and reducing the weight. did.

[0005]

A dome roof according to the present invention for solving the above-mentioned problems is a dome roof provided with a tension ring on the outermost periphery of a truss to limit horizontal deformation of the truss. The tension ring is made of a cable.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a dome roof according to the present invention will be described with reference to FIGS. 1 is a partially cutaway side view, FIG. 2 is a plan view of FIG. 1, and FIG.
FIG. 4 is an extracted enlarged cross-sectional view of an arrow IV section of FIG. 2.

[0007] As shown in FIGS. 1 to 4, a truss 11 having a curved shell shape formed of a steel frame as a frame is attached to a top of a building 1 via a bearing 2. Truss 1
A roof finishing material 12 is attached to the upper part of the first member 1.
A plurality of saddles 11a are provided at predetermined intervals along the circumferential direction at the bottom of the truss 11, that is, at the outermost periphery of the truss 11. On the outer surface side of the saddle 11a, a tension ring 13 formed of a plurality of cables 13a having extremely small bending stiffness and formed in an annular shape along the outermost peripheral portion of the truss 11 is provided.
The horizontal deformation of the truss 11 is restricted, that is, the deformation of the truss 11 to the outside due to its own weight such as the truss 11 and the roof finishing material 12 is restricted.

In such a dome roof, the truss 11 is supported by a vent or the like, a plurality of cables 13a are laid on the outer surface of the saddle 11a of the truss 11, the vent is disassembled, and the truss 11 or the like is disassembled by its own weight. The cable 13a can be easily constructed by applying a tension to the cable 13a by the outward deformation of the truss 11 (application of a cable laying method in a suspension bridge, a cable-stayed bridge, or the like).

Here, the bending moment acting on the tension ring will be examined. FIG. 5 shows how the dome roof is deformed by its own weight. In this figure, the side shapes before and after the deformation of the dome roof analyzed by applying the gravity by the finite element method are superimposed, and for easy understanding, the deformation amount is enlarged and displayed.

As shown in FIG. 1, the roof 101 before deformation without the action of gravity is deformed by the action of gravity and changes into the shape of the roof 102. At this time, the roof 10
The outermost portion 1 generates a horizontal displacement δ and a tilt angle displacement θ, and a bending moment is generated in each part of the roof 102.

The tension ring is a member for restraining the horizontal displacement δ generated on the roof 101 by reducing the outermost peripheral portion of the truss, thereby reducing the bending moment. Force acts. However, the tension ring receives a uniform torsional moment over the entire circumference due to the inclination angle displacement θ generated on the roof 101.
This torsional moment acts as a bending moment about the horizontal axis in the cross section of the tension ring. For this reason, the tension ring needs rigidity not only in the axial force but also in the bending moment in the cross section.

The relationship between the torsional moment and the bending moment acting on such a tension ring will be described with reference to FIG. When a torsional moment T (per unit length) is uniformly applied over the entire circumference of the tension ring 111, the angular displacement θ generated in the tension ring 111
And the stress σ in the axial direction are represented by the following equations (1) and (2), respectively (Reference: Strength Design Data Book Editing Committee; “Strength Design Data Book”; Shokabo; (196
2)).

[0013]

Θ = TR ² / EI (1) σ = TRy / I (2) where R = radius of tension ring E = Young's modulus I = cross section around x-axis (horizontal axis) Second moment y = distance in y-axis direction

The stress σ of the cross section of the tension ring 111 receiving the bending moment M is expressed by the following equation (3).

[0015]

## EQU2 ## σ = My / I (3)

Accordingly, from the above equations (1) to (3), the bending moment M is expressed by the following equation (4).

[0017]

M = TR = θEI / R (4)

That is, the bending moment M is proportional to the second moment of area I if the angular displacement θ is constant. For this reason, the bending moment M generated in the tension ring can be reduced by constructing the tension ring using a cable having an extremely smaller second moment of area than the cross-sectional shape of a cylindrical or box-shaped section. The weight of the ring can be reduced.

Therefore, according to the dome roof as described above, the axial force of the tension ring 13 can be increased without increasing the bending moment acting on the tension ring 13, and the cable 13a has a greater cross section than a steel plate. Since it has high strength even if it is small, it can be lighter than steel sheet even with the same strength as steel sheet, so the overall weight can be significantly reduced, and construction costs including foundations can be greatly reduced. it can.

In this embodiment, as shown in FIG. 4, the tension ring 13 is formed by providing an annular cable 13a at the outermost periphery of the truss 11 via a saddle 11a. As shown in FIG. 7, the cable 23a is provided between the outermost ends of the truss 11.
And the ends of the cables 23a are connected to the outermost ends of the truss 11, respectively, so that the tension ring 23 can be formed by the cables 23a.

[0021]

The dome roof structure according to the present invention is a dome roof provided with a tension ring on the outermost periphery of the truss for restricting horizontal deformation of the truss. The tension ring is formed of a cable. Thus, the axial force of the tension ring can be increased without increasing the bending moment acting on the shaft, and the overall weight can be greatly reduced, thereby greatly reducing the construction cost including the foundation.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of an embodiment of a dome roof according to the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is an enlarged view of an arrow III in FIG. 1;

FIG. 4 is an extracted enlarged sectional view of an arrow IV section in FIG. 2;

FIG. 5 is an analysis diagram showing a state of deformation of the dome roof due to its own weight.

FIG. 6 is an explanatory diagram of a torsional moment and a bending moment acting on a tension ring.

FIG. 7 is an extracted enlarged view of a main part of another embodiment of the dome roof according to the present invention.

FIG. 8 is a schematic configuration diagram of a conventional dome roof.

FIG. 9 is an enlarged enlarged view of an arrow IX part in FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Foundation 2 Bearing 11 Truss 11a Saddle 12 Roof finishing material 13 Tension ring 13a Cable 23 Tension ring 23a Cable

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Atsushi Isoda 1-1-1 Wadazakicho, Hyogo-ku, Kobe-shi, Hyogo Mitsubishi Heavy Industries, Ltd. 1-1-1 Wadazakicho Mitsubishi Heavy Industries, Ltd., Kobe Shipyard

Claims (1)

[Claims] 1. A dome roof provided with a tension ring on the outermost periphery of the truss for restricting horizontal deformation of the truss, wherein the tension ring is made of a cable.