JPH08284464A - Aseismatic structure of conical construction - Google Patents

Abstract

PURPOSE: To enhance aseismatic performance without impairing a concourse space located on the back of the stand of a conical construction and adding new aseismatic component members. CONSTITUTION: A plurality of diagonal beams 29 are provided radially along the inner peripheral surface of a conical construction. A stand slab 27 formed integrally between at least the adjacent diagonal beams 29 is joined to the diagonal beams 29. The diagonal beams 29 are supported on posts 37, and the ends of horizontal beams 41 are joined to the junction points P of the diagonal beams 29 and the posts 37 to integrate the stand slab 27, the diagonal beams 29, the posts 37, and the horizontal beams 41 together.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mortar-shaped (conical) structure having a stepped stand on its inner peripheral surface, for example, an earthquake-resistant structure such as a stadium.

[0002]

[Prior Art] In a mortar-shaped structure such as a stadium,
As shown in FIG. 5, an inner peripheral inclined surface 3 is formed so as to surround the center ground surface 1, and the inner peripheral inclined surface 3 is carried by a plurality of oblique beams 5 arranged radially. Also, this diagonal beam 5
Are supported by columns or the like (not shown) that are erected at predetermined intervals. A spectator stand 7 is provided on the inner peripheral inclined surface 3, and the spectator stand 7 is composed of individual stands 9 provided in a stepwise manner in the inclination direction. Conventionally, this stand 9 has not been joined to the oblique beam 5 in terms of a structure (that can withstand an external force). That is, the conventional stand 9 is generally designed not as a member element constituting a structure. On the other hand, in such a mortar-shaped stadium, a portion corresponding to the back side of the spectator stand 7 is often used as a concourse, and an open space is required to be formed.

[0003]

However, in the above-mentioned mortar-shaped structure, since joining as a structure on the side of the spectator stand 7 cannot be performed, in the case where the seismic performance is further enhanced in addition to the usual seismic frame. , There is no choice but to build a new earthquake resistant wall in the concourse part behind the spectator stand,
A new component as a seismic element was added, which increased the construction cost and impaired the open space as a concourse. The present invention has been made in view of the above circumstances, and provides a quake-resistant structure of a mortar-like structure that can enhance the aseismic performance without damaging the open space of the concourse and without adding new components. The purpose is to improve earthquake resistance while ensuring economic efficiency.

[0004]

Means for Solving the Problems The seismic resistant structure of a mortar-shaped structure according to the present invention for achieving the above object comprises a plurality of oblique beams radially provided along an inner peripheral surface of the mortar-shaped structure. A stand slab provided in the inner peripheral surface direction and integrally formed between at least adjacent slant beams and joined to the slant beams, a column carrying the slant beams, the slant beam and the columns And a horizontal beam whose ends are joined to the joining points of.

[0005]

The external force in the horizontal direction moving toward and away from the stand is transmitted by the horizontal beam and the oblique beam, and the internal force of pulling or compressing these members effectively acts on the seismic force. Further, the external force in the horizontal direction along the inner peripheral surface of the mortar-shaped structure is transmitted by the integrally formed stand slab, and the in-plane shear force of the stand slab effectively acts on the seismic force. By integrally joining the stand slab, the oblique beam, the column, and the horizontal beam, the in-plane shear force and the axial force of these members are combined, and the proof stress against the earthquake force is synergistically increased.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a mortar-shaped structure earthquake-proof structure according to the present invention will now be described in detail with reference to the drawings. FIG. 1 is a longitudinal sectional view showing an earthquake-resistant structure of the mortar-shaped structure of the present invention,
2 is a longitudinal sectional view showing the stand slab, FIG. 3 is a perspective side view showing a joined state of the stand slab and the oblique beam, and FIG. 4 is a view taken along the line AA of FIG. In a mortar-shaped structure, for example, in a stadium, a spectator stand 11 is provided so as to surround a central ground plane 1 (see FIG. 5), and the spectator stand 11 is composed of individual stands 13 provided in a stepwise manner in a slanting direction. To be done. When the stand 13 is constructed by a PC board, for example, the PC board 15 having an L-shaped cross section shown in FIG. 2 is used. The PC board 15 is composed of a horizontal step board portion 17 and an indentation portion 19 standing upright at the rear end thereof. PC
The plate 15 engages with the notch 21 formed in the recess 19 of the lower PC plate 15a at the tip of the step plate 17 of the upper PC plate 15b, and is connected in the inclined direction.

In the recess 19 of the lower PC board 15a,
Shear lines 2 protruding toward the step plate portion 17 side of the upper side PC board 15b
3 is buried. Concrete 25 is cast on the upper surface of the step board portion 17 on site, and the concrete 25 is a lower PC side.
The plate 15a is finished flush with the upper end surface of the indented portion 19.
As a result, the shear line 2 protruding from the lower PC board 15a
3 is concrete 2 cast on the upper PC board 15b
It will be buried in 5. That is, the lower PC board 15a
And the upper PC board 15b are shear bars 23 and concrete 2
5, the stand slab 27 having an integral structure is formed.

As shown in FIG. 3, a diagonal beam 29 is joined to the lower surface of the stand slab 27 which is integrally formed. Oblique beam 2
A plurality of 9 are radially arranged on the inner peripheral surface of the mortar and carry the lower surface of the stand slab 27. The stand slab 27 and the oblique beam 29 are joined by pouring concrete 31 in the space in a space having a right-angled triangular shape formed between the PC plate 15 and the oblique beam 29.

A C-shaped shear line 33 opening downward is embedded in the vertical direction between the indented portion 19 and the slanted beam 29 to enhance the joint strength. Further, between the rear end of the step plate portion 17 and the slanted beam 29, a U-shaped shear streak 35 opening in the slanted beam 29 direction is embedded in the horizontal direction, and the joint strength is enhanced. As a result, the stand slab 27 and the oblique beam 29 forming the inner peripheral surface of the mortar-shaped structure are integrally joined. It should be noted that the slanted beam 2 is provided above and below the barbed portion 19.
9 and horizontal stand shear lines 36a, 36
b is embedded, and the stand shear ribs 36a and 36b increase the rigidity of the stand slab 27.

Further, the slanted beams 29 are joined to the columns 37 at predetermined intervals, as shown in FIG. Meanwhile, stand slab 2
A concourse space 39 is secured on the back side of 7. In this concourse space 39, a slab 40 and a horizontal beam 41 are provided for each layer, and the end portion of the horizontal beam 41 on the stand side is a diagonal beam 2.
9 and the pillar 37 are joined to the joining point P. That is,
The oblique beam 29 is joined to and supported by the column 37 and the horizontal beam 41 at the same joint point P. With the above configuration, in the mortar-shaped structure of this embodiment, the stand slab 27, the oblique beam 29,
The pillar 37 and the horizontal beam 41 are integrated to form an earthquake-resistant structure.

In the earthquake-resistant structure of the mortar-shaped structure thus constructed, the external force (seismic force) in the horizontal direction (direction of arrow a) approaching and separating from the stand 13 is the slab 40, the horizontal beam 41, and the oblique beam. 29, the internal force (axial force) of pulling or compressing these members effectively acts on the seismic force. On the other hand, the inner peripheral surface of the mortar-shaped structure, that is, the seismic force in the horizontal direction (direction of arrow b) along the stand slab 27 is transmitted by the stand slab 27 that is integrally configured, and the in-plane shear force of the stand slab 27 is transmitted. Effectively acts on the seismic force.

With respect to twisting, the proof strength is exerted by the integrated stand as a whole or by a stand block integrated in a certain size.
Since the end portion of the horizontal beam 41 is joined to the joining point P between the oblique beam 29 and the column 37, the stand slab 27, the oblique beam 29, the column 37, and the horizontal beam 41 are integrated, and these members are joined together. The in-plane shear force and the axial force are combined to act synergistically on the seismic force. That is, the in-plane shear strength of the stand slab 27 and the axial strength of the oblique beam 29, which have not been conventionally used as a seismic structure element, are incorporated into the seismic resistance element, and the seismic resistance of the mortar-shaped structure is significantly improved. It will be.

According to the seismic structure of this embodiment, the stand 9 which has not been conventionally used as a constituent element of a structure is used.
Is formed as an integrated structure and incorporated as an earthquake-resistant structural element,
The stand slab 27 formed by this is joined to the diagonal beam 29, the column 37, and the horizontal beam 41 of the conventional structure to construct a structure having an integral structure, so that the in-plane shearing force and the axial force of these members are combined. Then, it effectively acts on the seismic force, and it is possible to obtain the same effect as when the earthquake resistant wall is provided. As a result, the seismic performance can be improved without adding a new component, and the open space of the concourse is not damaged.

In the above-described embodiment, the stand slab 27 having an integral structure is formed by using the PC plate 15. However, the stand slab 27 is formed by using an ordinary formwork, and concrete is cast to form a slant. Of course, it may be integrally formed with the beam 29. In addition, the stand slab 27 having the above-described integrated structure is preferably formed by integrally forming the entire inner peripheral surface of the mortar-shaped structure, but it is formed by a plurality of blocks divided in the inner peripheral surface direction or the inclined direction. Is also possible.
However, even in this case, at least the adjacent diagonal beams 2
The stand slab 27, the pillar 37, and the horizontal beam 41 must be divided into units that can be integrated with each other.

[0015]

As described in detail above, according to the seismic resistant structure of a mortar-shaped structure according to the present invention, a stand which has not been used as a seismic resistant structural element in the past is incorporated as a seismic resistant structural element, and the diagonal structure of the conventional structure is adopted. Since the beam, column, and horizontal beam are joined to construct an integrated structure, the in-plane shear force and axial force of these members can be effectively applied to the seismic force,
It is possible to obtain the same effect as providing the earthquake resistant wall. As a result, it is possible to significantly improve the earthquake resistance while maintaining the economical efficiency without damaging the open space of the concourse.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an earthquake-resistant structure of a mortar-shaped structure of the present invention.

FIG. 2 is a vertical sectional view showing a stand slab.

FIG. 3 is a perspective side view showing a joined state of a stand slab and a diagonal beam.

FIG. 4 is a view on arrow AA of FIG.

FIG. 5 is a diagram illustrating a mortar-shaped structure.

[Explanation of symbols]

 13 stand 15 PC board 27 stand slab 29 oblique beam 31 cast concrete 37 column 41 horizontal beam P joint point

Claims (3)

[Claims] 1. A plurality of oblique beams radially provided along an inner peripheral surface of a mortar-like structure, and a plurality of oblique beams provided in the inner peripheral surface direction, which are integrally formed between at least adjacent oblique beams. A mortar shape, comprising: a stand slab joined to a slant beam; a column carrying the slant beam; and a horizontal beam whose end is joined to a joint point of the slant beam and the column. Seismic structure of structures. 2. An individual stand is formed by a PC plate having an L-shaped cross section, and the PC plates are connected in the inclined direction of the oblique beam to form the stand slab having an integral structure. 1
Earthquake-resistant structure of the mortar-like structure described. 3. The stand slab and the diagonal beam are joined by filling the space between the PC plate having the L-shaped cross section and the diagonal beam with a concrete having a right-angled triangular cross section. The seismic resistant structure of the mortar-shaped structure according to claim 2.