Vibration damping structure of roof frame

Abstract

To provide a vibration control structure for a roof structure that can damp vibrations of the roof structure with a damper installed on a cantilevered section of the roof structure, while appropriately controlling the deformation of the roof structure as a whole.SOLUTION: A vibration control structure for a roof structure in which a number of cantilevered frame parts 3 having columns 1 and cantilevered roof beams 2 whose one end sides are joined to the columns 1 are arranged side by side in a ridge direction X in a state of being connected in the ridge direction X at a connection part 4. As a number of cantilevered frame parts 3, a damper frame part 3A in which a damper 5A is installed across a column 1 and a cantilevered roof beam 2, and a brace frame part 3B in which a brace 6 is installed across a column 1 and a cantilevered roof beam 2 are provided. The damper frame parts 3A are distributed so as not to be adjacent in the ridge direction X, and the brace frame part 3B is arranged between the distributed damper frame parts 3A.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a vibration control structure for a roof structure that can be suitably used to attenuate the vibration of a roof structure provided in a stand (audience seats) of a stadium or the like.

Background Art

[0002] This type of roof structure has a large number of cantilevered structure parts arranged in the girder row direction, each having a column and a cantilever roof beam whose one end side is joined and supported to the column. And, Patent Document 1 discloses a vibration control structure in which a roof structure (12) corresponding to the roof structure and a stand (14) are separated, and a damper (20) is provided between a support (18) that supports the roof (16) of the roof structure (12) and the stand (14). Further, in addition to the damper (20), in order to attenuate the vibration of the roof (16) of the roof structure (12), a rotary damper (42) is installed at the joint between the roof (16) and the support (18), or a cross damper (86) is installed across the stand (14) separated from the roof structure (12) and the roof (16).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Since the above-described rotary damper (42) and cross damper (86) are members that do not exhibit a damping function unless deformation occurs, in the vibration control structure described in Patent Document 1, it is assumed that the rigidity of the roof structure (16) is reduced so that deformation appropriately occurs in the rotary damper (42) and cross damper (86). However, if the rigidity of the roof structure (16) is reduced in this way, there is a problem that it is difficult to control the deformation of the entire roof structure (16).

[0005] In view of this situation, the main problem of the present invention is to provide a vibration damping structure for a roof structure that can attenuate the vibration of the roof structure with a damper installed in the cantilever structure part of the roof structure while appropriately controlling the deformation of the entire roof structure.

Means for Solving the Problems

[0006] A first characteristic configuration of the present invention is a vibration damping structure for a roof structure in which a number of cantilever structure parts having columns and a cantilever roof beam joined to one end side of the column are arranged side by side in the girder row direction while being connected in the girder row direction at a connecting part, As a number of cantilever structure parts, a damper structure part in which a damper is installed across the column and the cantilever roof beam, and a strut structure part in which a strut is installed across the column and the cantilever roof beam are provided, The damper structure parts are arranged in a dispersed manner so as not to be adjacent in the girder row direction, and the strut structure part is arranged between the dispersed damper structure parts.

[0007] According to this configuration, in a roof structure in which a number of cantilever structure parts are arranged side by side in the girder row direction while being connected in the girder row direction at a connecting part, as a cantilever structure part, in addition to a damper structure part (a damper structure part in which the rigidity is lowered to actively generate deformation) in which a damper is installed across the column and the cantilever roof beam, a strut structure part (a strut structure part in which the rigidity is increased) in which a strut is installed across the column and the cantilever roof beam is provided. Then, by dispersing the damper structure parts in which the rigidity is lowered to actively generate deformation so as not to be adjacent in the girder row direction, and arranging the strut structure parts in which the rigidity is increased between the dispersed damper structure parts, while controlling the deformation of the entire roof structure in a well-balanced manner, the vibration of the roof structure can be attenuated by the damper installed in the damper structure part.

[0008] A second characteristic configuration of the present invention is that the damper structure part and the strut structure part are alternately arranged in the girder row direction.

[0009] According to this configuration, by alternately arranging a damper structure part with low rigidity to actively generate deformation and a strut structure part with high rigidity in the purlin direction, while controlling the deformation of the entire roof structure more evenly, the vibration of the roof structure can be attenuated by the damper installed in the damper structure part.

[0010] The third characteristic configuration of the present invention is that the damper structure part and the strut structure part are arranged adjacent to each other in the purlin direction. The point is that a second damper is installed across the damper structure part and the strut structure part that are adjacent to each other in the purlin direction.

[0011] According to this configuration, in addition to the damping force of the damper installed in the damper structure part, the vibration of the roof structure can be attenuated by using the damping force of the second damper installed across the damper structure part and the strut structure part that are adjacent to each other in the purlin direction. Moreover, the damper installed in the damper structure part exerts a damping force on the vertical vibration of the cantilever roof beam of the damper structure part from its installation state, while the second damper installed across the damper structure part and the strut structure part that are adjacent to each other in the purlin direction can exert a damping force on at least the vibration of the cantilever roof beam of the damper structure part in the purlin direction from its installation state, and can more preferably attenuate the vibration of the roof structure during an earthquake or the like.

[0012] The fourth characteristic configuration of the present invention is that the second damper is installed across the column of the strut structure part and the cantilever roof beam of the damper structure part in a posture extending obliquely upward from the column of the strut structure part to the cantilever roof beam of the damper structure part.

[0013] According to this configuration, the second damper installed across the damper structure part and the strut structure part that are adjacent to each other in the purlin direction in a posture extending obliquely upward from the column of the strut structure part to the cantilever roof beam of the damper structure part can exert a damping force not only on the vibration of the cantilever roof beam of the damper structure part in the purlin direction but also on the vertical vibration from its installation state, and can more preferably attenuate the vibration of the roof structure during an earthquake or the like.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Mode for Carrying Out the Invention

[0015] Embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 3, this roof frame K is configured to cover, for example, above a stand (audience seat) S arranged around a competition space or the like. This roof frame K may be configured as a building body integral with the building body constituting the stand S, or may be configured as a separate building body separated from the building body constituting the stand S. Note that FIG. 3 schematically shows a state in which the roof frame K is looked up diagonally upward from the competition space side (front side).

[0016] As shown in FIGS. 1 and 2, the roof frame K includes a cantilever frame part 3 mainly including a column 1 made of reinforced concrete or the like and a cantilever roof beam 2 made of a steel frame member such as a section steel or a steel pipe whose one end side (base end side opposite to the eaves tip) is joined to the column 1. As shown in FIG. 3, a large number of cantilever frame parts 3 are arranged side by side in the girder direction X in a state of being connected in the girder direction X at the connecting part 4.

[0017] As shown in FIGS. 1 and 2, the cantilever frame part 3 is pin-joined such that the column head part of the column 1 and the base end side of the cantilever roof beam 2 are rotatable around a horizontal axis along the girder direction X (the depth direction of the paper surface in FIGS. 1 and 2) by a joining method with low fixing strength such as bolts. On the back side of the column 1 (opposite to the eaves tip), a steel frame backstay 7 made of a section steel or a steel pipe is installed across the base end of the cantilever roof beam 2 and the upper and lower middle parts of the column 1.

[0018] In this embodiment, as shown in FIG. 3, the cantilever roof beam 2 is configured as a three-dimensional truss beam having a reverse triangular cross-section, which includes one bottom chord member 21, two top chord members 22, and a plurality of connecting members 23 such as diagonal members and bundled members extending between the bottom chord member 21 and the top chord members 22. The two top chord members 22 are configured in a bifurcated shape sharing their tip sides (eaves sides).

[0019] The adjacent cantilever roof beams 2 in the bay direction X are configured by sharing (doubling up) the base end side portions 22a of the top chord members 22 located therebetween, and are connected in the bay direction X with this base end side portion 22a as one of the connecting portions 4. Further, a plurality of girders 8 extending in the bay direction X are installed between the adjacent cantilever roof beams 2 in the bay direction X, and the adjacent cantilever roof beams 2 in the bay direction X are connected in the bay direction X with the plurality of girders 8 as one of the connecting portions 4. In FIG. 3, only a part of the left side in the figure is shown for the plurality of girders 8 extending in the bay direction X, and the rest is omitted.

[0020] And in this roof structure K, as a number of cantilever structural parts 3, as shown in FIG. 1, there is provided a damper structural part 3A in which an oil damper 5A (an example of a damper) is installed across the column 1 and the cantilever roof beam 2, and as shown in FIG. 2, there is provided a strut structural part 3B in which a strut 6 is installed across the column 1 and the cantilever roof beam 2. In this embodiment, the arrangement position of the oil damper 5A in the damper structural part 3A and the arrangement position of the strut 6 in the strut structural part 3B are the same. Hereinafter, an explanation will be added regarding the damper structural part 3A, the strut structural part 3B, and the arrangement of the damper structural part 3A and the strut structural part 3B.

[0021] (Damper Structural Part) In this damper structural part 3A, as shown in FIG. 1, an oil damper 5A that applies a damping force to the vibration of the cantilever roof beam 2 during an earthquake or the like is in a posture (a telescopic posture) extending obliquely upward from the upper end side of the column 1 toward the base end side of the cantilever roof beam 2 at the joint portion between the column 1 and the cantilever roof beam 2, and is installed across the upper end side of the column 1 and the base end side of the cantilever roof beam 2 (in this example, the connection position between the bottom chord member 21 and the connecting member 23). Therefore, in this damper structure portion 3A, since the proximal end side of the cantilever roof beam 2 is pin-jointed to the upper end portion of the column 1, the damping force of the oil damper 5A can be appropriately applied to the vertical (axial) rocking particularly with the proximal end side of the cantilever roof beam 2 as the fulcrum.

[0022] The oil damper 5A includes, for example, a cylinder 51 filled with oil inside and a rod 52 that protrudes in and out of the cylinder 51. The overall length extends when the rod 52 is pulled out from the cylinder 51, and the overall length contracts when the rod 52 is pushed into the cylinder 51.

[0023] One end portion of the oil damper 5A joined to the column 1 by an anchor bolt, nut, etc. is provided with a ball joint portion 53 that can change its posture with respect to the column 1. The other end portion of the oil damper 5A joined to the cantilever roof beam 2 by a bolt, nut, etc. is also provided with a ball joint portion 53 that can change its posture with respect to the cantilever roof beam 2. Instead of the ball joint portion 53, a joint portion that can rotate around a horizontal axis along at least the bay direction X may be provided.

[0024] (Brace structure portion) In this brace structure portion 3B, as shown in FIG. 2, a brace 6 that enhances the rigidity of the joint portion between the column 1 and the cantilever roof beam 2 extends obliquely upward from the upper end side of the column 1 toward the proximal end side of the cantilever roof beam 2 at the joint portion between the column 1 and the cantilever roof beam 2, spanning the upper end side of the column 1 and the proximal end side of the cantilever roof beam 2 (in this example, the connection position between the lower chord member 21 and the connecting member 23). Therefore, in this brace structure portion 3B, since the proximal end side of the cantilever roof beam 2 is pin-jointed to the upper end portion of the column 1, resistance can be provided by the axial member bearing capacity (tensile bearing capacity and compressive bearing capacity) against the vertical rocking particularly with the proximal end side of the cantilever roof beam 2 as the fulcrum, and deformation can be suppressed.

[0025] (Arrangement of damper structure portion and brace structure portion) In this roof structure K, as schematically shown in FIG. 3, the damper structure portions 3A are dispersedly arranged so as not to be adjacent in the girder row direction X. In other words, when a number of cantilever structure portions 3 are arranged side by side in the girder row direction X, the damper structure portions 3A are arranged so as not to be continuous in the girder row direction X. And a strut structure portion 3B is arranged between the damper structure portions 3A dispersedly arranged in the girder row direction X.

[0026] Thus, in the roof structure K in which a number of cantilever structure portions 3 are arranged side by side in the girder row direction X in a state of being connected in the girder row direction X by the connecting portions 4, the damper structure portions 3A, in which it is desired to reduce the rigidity and actively generate deformation, are dispersedly arranged so as not to be adjacent in the girder row direction X, and a strut structure portion 3B for increasing the rigidity is arranged between the dispersedly arranged damper structure portions 3A, whereby the vibration of the roof structure K can be attenuated by the oil damper 5A provided in the damper structure portion 3A while controlling the deformation of the entire roof structure K in a well-balanced manner.

[0027] Furthermore, in the present embodiment, the damper structure portions 3A and the strut structure portions 3B are alternately arranged in the girder row direction X. Thus, by alternately arranging the damper structure portions 3A, in which it is desired to reduce the rigidity and actively generate deformation, and the strut structure portions 3B for increasing the rigidity in the girder row direction X, the vibration of the roof structure K can be attenuated by the oil damper 5A provided in the damper structure portion 3A while controlling the deformation of the entire roof structure K even more in a well-balanced manner.

[0028] Note that the damper structure portions 3A and the strut structure portions 3B are not limited to being alternately arranged in the girder row direction X, and two or more strut structure portions 3B may be arranged between the damper structure portions 3A in the girder row direction X, or in addition to the strut structure portions 3B between the damper structure portions 3A in the girder row direction X, a cantilever structure portion 3 in which neither the oil damper 5A nor the strut 6 is installed may be further arranged.

[0029] 〔Alternative Embodiment〕 Another embodiment of the present invention will be described. The configurations of the embodiments described below are not limited to being applied individually, but can also be applied in combination with the configurations of other embodiments.

[0030] (1) As an improvement of the above-described embodiment, as shown in FIG. 4, in addition to the oil damper 5A of the damper frame portion 3A, a second oil damper 5B (an example of a second damper) may be installed across the damper frame portion 3A and the square rod frame portion 3B that are arranged adjacent to each other in the girder row direction X. Note that the configuration of the second oil damper 5B can be the same as that of the oil damper 5A.

[0031] In this case, as shown in FIG. 4, the damper frame portion 3A and the square rod frame portion 3B are arranged adjacent to each other in the girder row direction X, and the second oil damper 5B is installed across the damper frame portion 3A and the square rod frame portion 3B that are arranged adjacent to each other in the girder row direction X. In the illustrated example, for one damper frame portion 3A, the second oil damper 5B is installed between each of the two square rod frame portions 3B that are arranged adjacent to both sides of the damper frame portion 3A in the girder row direction X.

[0032] The second oil damper 5B is installed across the column 1 of the square rod frame portion 3B adjacent to the damper frame portion 3A and the cantilever roof beam 2 of the damper frame portion 3A in a posture (a telescopic posture) that extends obliquely upward from the upper end side of the column 1 of the square rod frame portion 3B adjacent to the damper frame portion 3A to the base end side of the cantilever roof beam 2 of the damper frame portion 3A.

[0033] Specifically, one end portion of the second oil damper 5B is joined to a portion where the square rod 6 is joined to the column 1 of the square rod frame portion 3B adjacent to the damper frame portion 3A or a portion adjacent thereto, and the other end portion of the second oil damper 5B is joined to a portion where the oil damper 5A is joined to the cantilever roof beam 2 of the damper frame portion 3A or a portion adjacent thereto.

[0034] Therefore, the posture (telescopic posture) in which the second oil damper 5B extends is a posture that extends in an oblique direction intersecting the girder row direction X in plan view and a posture that extends in an oblique direction intersecting the vertical direction in side view. Therefore, the second oil damper 5B can exert damping forces on the vibration in the girder row direction X (for example, vibration caused by horizontal force during an earthquake) and the vibration in the vertical direction (vertical direction) of the cantilever roof beam 2 of the damper frame part 3A from its installation state, and can further preferably damp the vibration of the roof frame K. Note that the second oil damper 5B may be joined, for example, in a posture extending horizontally across the cantilever roof beam 2 of the strut frame part 3A and the cantilever roof beam 2 of the damper frame part 3.

[0035] (2) In the above-described embodiment, the case where the dampers installed in the damper frame part 3A and the second damper installed across the damper frame part 3A and the strut frame part 3B adjacent in the girder row direction X are the oil dampers 5A and 5B has been shown as an example, but dampers with various structures such as viscous dampers can be adopted.

[0036] (3) In the above-described embodiment, the case where the cantilever roof beam 2 is configured as a three-dimensional truss beam with an inverted triangular cross-section has been shown as an example, but it may be composed of a single beam member or the like.

[0037] (4) In the above-described embodiment, the case where the arrangement position of the oil damper 5A in the damper frame part 3A and the arrangement position of the strut 6 in the strut frame part 3B are the same has been shown as an example, but the arrangement position of the oil damper 5A in the damper frame part 3A and the arrangement position of the strut 6 in the strut frame part 3B may be made different.

Explanation of Signs

[0038] 1 Column 2 Cantilever roof beam 3 Cantilever frame part 3A Damper frame part 3B Strut frame part 4 Connecting part 5A Oil damper (damper) 5B Second oil damper (second damper) 6 Strut K Roof frame X Girder row direction

Claims

1. A vibration damping structure for a roof structure in which a number of cantilevered structural parts having columns and cantilever roof beams with one end joined to the columns are arranged side by side in the bay direction in a state of being connected in the bay direction at the connecting parts, As the number of cantilevered structural parts, a damper structure part in which a damper is installed across the column and the cantilever roof beam, and a strut structure part in which a strut is installed across the column and the cantilever roof beam are provided, A vibration damping structure for a roof structure in which the damper structure parts are arranged in a dispersed manner so as not to be adjacent in the bay direction, and the strut structure part is arranged between the dispersed damper structure parts.

2. The vibration damping structure for a roof structure according to Claim 1, wherein the damper structure part and the strut structure part are alternately arranged in the bay direction.

3. The damper structure part and the strut structure part are arranged adjacent to each other in the bay direction, The vibration damping structure for a roof structure according to Claim 1 or 2, wherein a second damper is installed across the damper structure part and the strut structure part arranged adjacent to each other in the bay direction.

4. The vibration damping structure for a roof structure according to Claim 3, wherein the second damper is installed across the column of the strut structure part and the cantilever roof beam of the damper structure part in a posture extending obliquely upward from the column of the strut structure part to the cantilever roof beam of the damper structure part.

Images