JP2546247Y2 - Brace equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brace device for a building or a civil engineering structure, and more particularly to a brace device which takes into account a shaking such as an earthquake or a strong wind.

[0002]

2. Description of the Related Art FIG. 17 shows a conventional steel structure, in which X-shaped braces 2a and 2b are provided between steel beams 1a and 1b.
Is stretched. Some other types are provided with braces, and any of the configurations is provided to protect the building from earthquakes, strong winds, and the like. For example, in FIG. 17, when an external force Q acts on the steel beam 1a in the direction of the arrow, a tensile force acts on both ends of the brace 2a, and
A compressive force acts on b from both ends toward the center. In the case of shaking such as an earthquake or a strong wind, the direction of the external force Q acting on the steel beams 1a and 1b is reversed, and an alternating load is applied.

[0003] When describing the relationship between the tensile force and deformation of the brace 2a at 18, while against the A ₁ in the tensile force between the A _2, braces 2a in proportion to the tensile force is slightly resilient Deform. Tension is the yield point A ₂ if above a certain, braces 2a between the A ₂ A ₃ produces a plastic deformation. A If it be released tension in A ₃ between A ₃ of A ₄ are braces 2a is slightly contracted, the compression force acts
₅ occurs buckling, from A ₅ to A ₆ are unable resistance to compressive forces, deformation only increases.

Next, when a new tensile force is applied, as shown by a broken line, from A ₆ to A ₇ , it simply expands without generating a tensile resistance. Then, A ₇ thereafter an action similar to that described above. As a result, as shown in the relationship between the load and the deformation of the structure shown in FIG. 19, the hysteresis area of the restoring force characteristic is very small, and the seismic resistance is poor. on the other hand,
There is also known a tension brace described in Japanese Patent Publication No. Sho 61-2132 in which a connecting device that slides in the compression direction but does not slide in the tension direction is interposed. As shown in FIG. 20, a connecting device 4 using locking projections and grooves is interposed in the brace material 3 as shown in FIG. 20, and two plates 5 and 6 each having the brace material 3 attached thereto, and both plates It consists of two cover plates 7, 7 sandwiching 5, 6 therebetween. The plate 5 fits into the recess 8 of the plate 6. On the other hand, FIG. 21 shows another embodiment described in the publication, in which a connecting device 10 utilizing friction for a brace 9 is used.
The connecting device 10 is composed of a steel pipe 11 connected to the brace 9 by a screw at the left end in the figure, a steel pipe 12 having a taper, and a wedge 13 divided into two parts in the steel pipe 12. The steel pipe 11 and the steel pipe 12 are engaged with each other by screws, and the wedge 13 is pressed into the steel pipe 12 against the steel pipe 11 and the brace 9 on the right side in the drawing.
Contains four.

[0005]

The conventional brace device shown in FIG. 17 buckles against a compressive force when it receives an alternating load of tension and compression. Further, when a tensile force is applied, there is no instantaneous resistance, and as a result, the hysteresis area becomes extremely small as described above. On the other hand, the brace described in Japanese Patent Publication No. Sho 61-2132 slides in the compression direction and resists in the tension direction, so that the brace does not buckle and the hysteresis area related to "load-deformation" increases. appear. However, for example, when a tensile load is applied between the braces 9 in the embodiment shown in FIG. 21, if the friction coefficient between the brace 9 and the wedge 13 is low, slippage occurs.

As shown in FIG. 22, a connecting device 10 is formed by interposing a wedge 13 between a tapered steel pipe 12 and one brace 9a, and a connecting device 10 is provided between one brace 9a and the other brace 9b. The experiment was conducted by applying an alternating load P (tonf) to the. The angle θ ₁ between the one brace 9a and the wedge 13 is 0 degree in accordance with the embodiment of Japanese Patent Publication No. 61-2132, and the angle θ ₂ of the inclination between the one brace 9a and the steel pipe 12 (that is, the wedge 13). Was set to 20 degrees. Also, the surface of the one brace 9a, the steel pipe 12, and the wedge 13 are not particularly subjected to blasting or the like,
The friction coefficient μ of each was 0.29.

FIG. 23 shows the relative deformation of one brace 9a and the other brace 9b, that is, the slip deformation of the connecting device 10, and FIG. 24 shows the deformation of the whole brace. It was clarified that it was almost impossible to resist simply by slipping. Next, the brace 9a and the steel pipe 12 have the same shape as the connecting device 10 shown in FIG.
And the surface of the wedge 13 is roughened, and the friction coefficient μ
Was increased to 0.52, and the same alternating load P (tonf) was applied to conduct an experiment.

FIG. 25 shows the slip deformation of the connecting device 10 at that time, and FIG. 26 shows the deformation of the entire brace. Resistance has been created. However, the generation of the resistance to the tensile force is delayed, and the resistance to the tensile load P fluctuates greatly, and the history of the relationship between the load and the deformation is disturbed. Therefore, it is clear that it is extremely difficult to put the brace device described in the above publication into practical use.

Therefore, there is a technical problem to be solved in order to solve such a defect and to protect the building from vibrations such as earthquakes and strong winds with a simple configuration. The present invention solves this problem. The purpose is to do.

[0010]

SUMMARY OF THE INVENTION The present invention has been proposed in order to achieve the above-mentioned object. A brace to be stretched between steel beams is divided, and an outer frame is fixed to a divided portion of one of the braces. Then, while inserting the distal end of the split part of the other brace into the opening of the outer frame, the width of the outer frame is formed in a tapered shape toward the opening, and The width of the leading end of the split part of the other brace is widened to be tapered toward the rear, and an intermediate member is provided in a gap between the outer frame of the one brace and the leading end of the other brace. A brace device in which the inner surface of the outer frame of one brace and the outer surface of the tip of the other brace face each other via an intermediate member, and the outer frame of one brace and the other brace The intermediate member interposed in the gap with the tip of the The tapering of the tapered toward law the opening of the outer frame member, in the compression spring towards the intermediate member into the opening of the outer frame member there is provided a brace apparatus biased to press.

[0011]

When a tensile force acts on the brace device of the present invention, a tensile deformation tends to occur between the outer frame provided on one of the divided braces and the tip of the other brace. However, the width method of the outer frame body is formed in a tapered shape tapering toward the opening, and the width dimension of the leading end of the divided portion of the other brace is widened and narrowed rearward. Because of the tapered shape, the intermediate member interposed in the gap between the outer frame of one brace and the tip of the other brace acts as a stopper, generating a large resistance force in the pulling direction. To prevent slip deformation of the brace device.

If the width of the intermediate member is tapered toward the opening of the outer frame, the tip of the other brace is formed in a tapered shape. The resistance to the tensile force increases without increasing the friction coefficient of the member. On the other hand, when a compressive force acts on the brace device, the distal end of the other brace slides on the inner surface of the intermediate member and enters the outer frame. Accordingly, the brace device contracts with little resistance to compressive force, shortening the overall length of the brace, and preventing the brace from buckling. Also, when the tip of the other brace enters the inside of the outer frame, the gap between the tip of the other brace and the outer frame becomes large, and there is a tendency for both sides to form. Since the intermediate member is pressed toward the opening of the outer frame by the compression spring, the intermediate member moves toward the opening of the outer frame in accordance with the approach dimension of the tip of the other brace. However, there is no occurrence on both sides.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. FIG. 1 shows a main part of a steel structure of a building. Steel columns 21, 21,... Are erected, and a steel beam 22 and a steel beam 23 are provided in parallel. In the configuration shown in FIG. 1, plates 24, 24,... Are welded to the connection corners between steel columns 21, 21,... And steel beams 22, 23, and an X-shaped brace device 25, 25 are provided. In addition, although not particularly shown, brace devices 25 may be provided in other forms.

FIGS. 2 and 3 show a main part of a brace device 25. A brace extending between steel beams is divided into two substantially at an intermediate portion, and one end of an outer frame 27 is fixed to a divided portion of one brace 26. Set up. An opening 28 is provided at the other end of the outer frame 27, and the width of the outer frame 27 is tapered toward the opening 28. At the same time, the split portion of the other brace 29 is inserted into the opening 28 of the outer frame 27. The tip portion 29a of the split portion of the other brace 29 is formed in a tapered shape whose width is widened and narrowed rearward, and the outer frame body 27 of the one brace 26 and the other brace are formed. An intermediate member 30 is provided in a gap with the tip portion 29a.
30 ... is interposed.

As shown in FIG. 2, the width of the intermediate members 30, 30,... Is tapered toward the opening 28 of the outer frame 27, and the intermediate members 30 are compressed by compression springs 31, 31,. Are urged toward the opening 28 of the outer frame 27. In this embodiment, since the outer frame body 27 has a hollow truncated conical shape and the distal end 29a of the other brace has a tapered conical shape, the intermediate members 30, 30,... , Outer frame 2
7 is radially arranged in the gap between the other brace and the tip 29a of the other brace. However, although not shown, for example, the outer frame body may be formed in a tapered rectangular box shape, and the tip of the other brace may be formed in a tapered quadrangular pyramid, or in a combination of a flat plate or a triangular pyramid. Well, it should not be limited to the shape of this embodiment.

Next, an experiment was conducted on how the "load-deformation" relationship was changed by applying a tensile force and a compressive force to the brace device 25 of the present invention. The brace device 25 shown in FIG. 4 sets the angle θ ₁ between the other brace 29 and the intermediate member 30 (that is, the taper angle on one side of the tip portion 29a of the other brace) to 10 degrees, and The angle θ ₂ between the inclined surface of the frame body 27 and the inclined surface of the tip portion 29a of the other brace (that is, the taper angle on one side of the intermediate member 30) is set to 10 degrees. The friction coefficient μ of each of the outer frame 27, the tip portion 29a of the other brace, and the intermediate member 30 was 0.29.

FIG. 5 shows the brace device 25 when an alternating load P (tonf) is applied to the brace device 25 shown in FIG.
And resists a tensile load while generating a slight slip deformation up to a tension of about 8 tonf at which the brace base material yields. On the other hand, it slips without resisting the compressive load, and the end face distance between the tip portion 29a of the other brace and the outer frame 27 is reduced. or,
FIG. 6 shows the amount of deformation of the entire brace. The brace deforms while resisting the tensile load, and when only the brace base material yields, the tensile load is released and a compressive load is applied. Shrinks without resistance, preventing buckling of the entire brace. Then, when the tensile load is applied again, the resistance starts.

The brace device 25 shown in FIG.
₂ is 10 degrees, which is the same as that of FIG. 4, but the angle θ ₁ between the other brace 29 and the intermediate member 30 is set to 30 degrees. The friction coefficient μ of each member is μ = 0.29 as in the case of FIG. FIG. 8 shows the slip deformation when an alternating load P (tonf) is applied to the brace device 25. The slip deformation is further improved from the result shown in FIG. It resists to about 8 tonf tension at which the base material yields with almost no slip deformation. On the other hand, as in the case of FIG. 4, slippage occurs without resistance to the compression load, and the end face distance between the distal end portion 29a of the other brace and the outer frame 27 is reduced. FIG. 9 shows the amount of deformation of the entire brace. If the brace deforms while instantaneously starting resistance to the tensile load, and only the brace base material yields, the tensile load is released and a compressive load is applied. , Shrinks without resistance to the compressive load as described above,
Prevents buckling of the entire brace. Then, when the tensile load is applied again, the resistance starts.

Here, the relationship between the force acting on the intermediate member 30 and the angle of the intermediate member 30 will be described. Assuming that the intermediate member is a wedge T as shown in FIG. 10, if a tensile load P acts on the brace device 25, a force _PT to move the wedge T upward and rightward acts on the wedge T.
If there is no frictional resistance on both sliding surfaces, wedge T
Has moved to the upper right, and the brace device 25 cannot resist the tensile load. However, if there is the following frictional resistance, the movement of the wedge T to the upper right is restricted, and the brace device 2
5 will be able to resist the tensile load. Shear P _S required for a straight pressure P _T and wedge T applied not move on both sliding surfaces of the wedge T is given by the following equation.

[0020]

(Equation 1)

Accordingly, the friction coefficient μ required for both sliding surfaces so that the wedge T does not slip can be obtained by the following equation by the ratio of (Equation 1) and (Equation 2).

[0022]

(Equation 2)

FIGS. 11 to 13 show the relationship between the direct pressure P _T , the shear force P _S , the coefficient of friction μ, and the angle θ ₂ obtained from the equations (1) to (3). 11 for different ones several taper angle theta ₁ of the other brace of the tip 29a from 0 degrees to 50 degrees, in the case where the taper angle theta ₂ of the intermediate member 30 is changed to +50 degrees from -50 degrees The magnitude of the direct pressure _PT is plotted on the basis of the calculation result of (Equation 1). When the direct pressure _{PT, that} is, the force acting perpendicular to the inclined surface of the outer frame 27 increases, the inclined surface of the outer frame 27 is deformed outward, so that the other end 2 of the brace is bent.
The back brace 9a and the intermediate member 30 cause a backlash, and the brace device 25 has a large slip deformation. Therefore, the direct pressure P
It is better to make _T small, and the tip 29a of the other brace
Next taper angle theta ₁ greatly them if linear pressure P _T of the small, also linear pressure P _T by increasing the taper angle theta ₂ of the intermediate member 30 becomes small.

On the other hand, FIG. 12 is a graph showing the relationship between the taper angle θ ₂ of the intermediate member 30 and the friction coefficient μ based on the calculation result of Equation (3). As the taper angle θ ₂ decreases, the friction coefficient μ required for preventing the wedge T from moving decreases. Accordingly, the friction coefficient μ necessary for preventing the wedge T from moving is reduced, and the direct pressure P
_It can be seen that _T can be reduced by increasing the taper angle θ ₁ and decreasing the taper angle θ ₂ .

FIG. 13 shows the deformation of the outer frame 27 to the outside of the inclined surface and the slip deformation of the intermediate member 30. If the amount of the deformation of the outer frame 27 to the outside is defined as Δ, the reason is as follows. slip deformation delta _x of the intermediate member 30 which is represented by the following equation.

[0026]

(Equation 3)

According to equation (4), if θ ₁ + θ ₂ is increased, the slip deformation Δ with respect to the same deformation amount σ of the outer frame 27 is obtained.
_x can be reduced. Then, as described above, the smaller the taper angle θ ₂ of the intermediate member 30 is, the lower the friction coefficient μ is. Therefore, the taper angle θ ₂ of the intermediate member 30 is not so large, and the tip 2
If 9a larger taper angle theta ₁ of, reduces the straight pressure P _T acting on the outer frame 27, and the same of the outer frame member 2
Slip deformation delta _x to the amount of deformation delta 7 also caused a phase Retained effect of decreasing. Therefore, it was found from the results of the experiment that the brace device 25 shown in FIG. 7 has a very strong seismic restoring force.

[0028] As described above, since the inclined surface when the deformation slip deformation delta _x of the outer frame body 27 is increased, and reinforced by ribs or the like to the outer frame 27, increase the rigidity of the outer frame 27 Experimental results have shown that this is also an effective means. FIG. 14 shows the relationship between the tensile force P and the elongation δ when the brace device 25 of the present invention receives a tensile load. Unlike the conventional type shown in FIG. 18, to release the tension in A ₃ after only the base material of the brace is surrendered by A ₂ by a tensile force,
Further when the compression force is applied, the buckling at the A ₄ is eliminated by contraction of the brace apparatus 25 as described above.
Therefore, starting the instant resistance again pulling force acts in A _6.

FIG. 15 shows a state in which the building shown in FIG. 1 has been deformed by receiving an alternating load.
Since the two brace devices 25, 25 are used in the X-shape, the relationship between the alternating load Q and the displacement u is a graph as shown in FIG. That is, the two brace devices 25, 25
, The unloading rigidity after yielding is twice the initial rigidity K _O , the hysteresis area is large, and a brace with extremely high earthquake resistance is obtained.

The present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified one.

[0031]

[Effects of the Invention] The present invention is, as described in detail in the above embodiment,
By making the brace device contract against the tensile force and shrink without resisting the compressive force, the absorption of energy becomes large with respect to the alternating load between the tensile force and the compressive force. Vibration resistance increases. Therefore, it is possible to build a structure that has high earthquake resistance and is resistant to vibration such as strong wind.

Further, the brace device of the present invention is provided with a taper at the tip end of the brace and is engaged with the outer frame body, as compared with the embodiment of Japanese Patent Publication No. Sho 61-2132, which resists only by frictional force. Therefore, the present invention is a practically useful idea in that a safe and reliable operation result can be obtained with a simple configuration without increasing the friction coefficient of each member such as the outer frame.

[Brief description of the drawings]

FIG. 1 is a front view of a main part of a building provided with a brace device of the present invention in an X-shaped steel structure.

FIG. 2 is a vertical front view of the brace device of the present invention.

FIG. 3 is a sectional view taken along line DD of FIG. 2;

FIG. 4 is a vertical sectional front view of the brace device used in the first experiment.

FIG. 5 is a graph showing a first experimental result and showing a relationship between an alternating load and a slip deformation amount of a brace device.

FIG. 6 is a graph showing a first experimental result and showing a relationship between an alternating load and a deformation amount of the entire brace.

FIG. 7 is a longitudinal sectional front view of a brace device used in a second experiment.

FIG. 8 is a graph showing a second experimental result and showing a relationship between an alternating load and a slip deformation amount of a brace device.

FIG. 9 is a graph showing a second experimental result and showing a relationship between an alternating load and a deformation amount of the entire brace.

FIG. 10 is an explanatory diagram illustrating a relationship between a force acting on the intermediate member and an angle of the intermediate member.

FIG. 11 is a graph showing the relationship between the taper angle of the intermediate member and the direct pressure on the outer frame.

FIG. 12 is a graph showing a relationship between a taper angle of an intermediate member and a friction coefficient.

FIG. 13 is an explanatory diagram of deformation of the outer frame body to the outside of the inclined surface and slip deformation of the intermediate member.

FIG. 14 is a graph showing the relationship between tensile force and elongation when a tensile load is applied to the brace device of the present invention.

FIG. 15 is a main part front view showing a state in which a building provided with the brace device of the present invention in an X-shaped steel structure is deformed.

FIG. 16 is a graph showing the relationship between load and displacement when an alternating load is applied to the brace device of the present invention.

FIG. 17 is a front view of a main part of a building including a conventional X-shaped steel structure and a brace device.

FIG. 18 is a graph showing the relationship between tensile force and elongation when a tensile load is applied to a conventional brace device.

FIG. 19 is a graph showing the relationship between load and deformation when an alternating load is applied to a building using a conventional brace.

FIG. 20 is a front view of a main part of a first embodiment of a brace device described in Japanese Patent Publication No. 61-2132.

FIG. 21 is a longitudinal sectional view of a third embodiment of the brace device described in Japanese Patent Publication No. Sho 61-2132.

FIG. 22 is a longitudinal sectional front view of a brace device described in Japanese Patent Publication No. 61-2132 used in an experiment of “load-displacement” characteristics.

FIG. 23 is a graph showing experimental results and showing the relationship between the alternating load and the amount of slip deformation of the brace device.

FIG. 24 is a graph showing experimental results and showing the relationship between the alternating load and the amount of deformation of the entire brace.

FIG. 25 is a graph showing a result of an experiment in which the friction coefficient of the brace device shown in FIG. 24 is increased, and showing a relationship between an alternating load and a slip deformation amount of the brace device.

26 is a graph showing a result of an experiment in which the friction coefficient of the brace device shown in FIG. 24 is increased, and showing a relationship between an alternating load and a deformation amount of the entire brace.

[Explanation of symbols]

Reference Signs List 21 steel column 22, 23 steel beam 25 brace device 26 one brace 27 outer frame 28 opening 29 other brace 29a tip of other brace 30 intermediate member 31 compression spring θ ₁ angle between other brace and intermediate member angle (the other on one side of the taper angle of the tip portion of the brace) theta ₂ one inclined surface and the other inclined surface of the distal end portion of the brace of the outer frame body of the brace (one side of the taper angle of the intermediate member)

Claims (2)

(57) [Scope of request for utility model registration] 1. A brace to be stretched between steel beams is divided,
An outer frame body is fixed to the divided portion of one brace, and the leading end of the divided portion of the other brace is inserted into the opening of the outer frame, and the width of the outer frame is adjusted to the opening. The other brace is formed in a tapered shape, and the other brace has a tapered shape in which the width of the leading end of the divided portion is widened and narrowed toward the rear, and the outer frame body of the one brace is formed. An intermediate member is interposed in the gap with the tip of the other brace, and the inner surface of the outer frame of one brace and the outer surface of the tip of the other brace are opposed to each other via the intermediate member. Characteristic brace device. 2. An intermediate member interposed in a gap between an outer frame of one brace and a tip of the other brace has a width dimension tapered toward an opening of the outer frame, and
2. The brace device according to claim 1, wherein the compression spring urges the intermediate member toward the opening of the outer frame body.