JPH0535973U - Vibration control structure of the body - Google Patents

Abstract

(57) [Summary] [Purpose] To improve earthquake resistance. [Structure] Beams 12 are attached to columns 11, and end portions 14 of these beams 12 are opposed to each other. These opposing beams 1
A gap 15 is provided between the end portions 14 and 14 of the 2 and 12, and a connecting plate 16 is bridged between the end portions 14 and 14. These beams 1
Nos. 2 and 12 are made of H-shaped steel with flanges 17 provided on the upper and lower sides. The connecting plates 16 are fixed to the upper and lower flanges 17, and the connecting plates 16 connect the ends 14 of the beams 12 facing each other. [Effect] Since the energy during an earthquake is positively absorbed by the connecting plate that plastically deforms due to the deformation generated between the beams,
Improve the energy absorption performance of the joint structure between the ends of the beam,
The quake resistance of the body can be improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vibration control structure for a frame of a building structure, and more particularly, to a vibration control structure for a frame that can be appropriately dealt with when an earthquake occurs.

[0002]

[Prior Art]

 Conventionally, in the design of a building structure, as shown in FIG. 8, a stress-displacement diagram showing a relationship between stress (Q) and displacement (δ) is used. In this stress-displacement diagram, the vertical axis represents stress (Q) and the horizontal axis represents displacement (δ). Then, when the stresses of the entire frame 1, the frame 2 and the seismic wall 3 are plotted, the stress increases up to the yield point in proportion to the Young's modulus, and the stress is suppressed when the stress points are exceeded. In other words, if the entire frame 1, frame 2, and earthquake-resistant wall 3 exceed the yield point, it cannot be restored and remains as permanent strain.

[0003]

[Problems to be solved by the device]

 By the way, in the design of the building frame, the members are designed with the allowable stress level within the stress (primary design level) shown by the chain line in FIG. 8 where the whole frame 1, the frame 2 and the seismic wall 3 are below the yield point. Within this primary design level, the elastic design is used, and if vibration due to an earthquake of primary design level that does not exceed QY is transmitted to the frame 2, the vibration is not damped. Therefore, when vibrations due to an earthquake at the primary design level are transmitted to the frame 2, there was a problem that the energy absorption performance of the entire frame 1 during an earthquake was small.

The present invention effectively solves the above problems, and an object of the present invention is to provide a skeleton vibration control structure with improved seismic resistance by improving energy absorption capacity during an earthquake.

[0005]

Means for Solving the Problems A structure for damping a structure of a building according to the present invention is a structure for controlling a building structure, in which the ends of beams connected to each other are opposed to each other, and the ends of the beams are opposed to each other. A gap is provided, and a connecting plate that absorbs energy by bending and yielding is provided between the beams facing each other. The connecting plates are provided at both upper and lower end portions of the opposite beam, respectively. It is characterized in that it is formed with a yield strength smaller than the yield strength of.

[0006]

[Action]

 According to the structure for damping the frame of the present invention, the gap is provided between the ends of the opposing beams, and the connecting plate is provided between the ends of the opposing beams, and the connecting plate yields early. Thus, seismic energy can be absorbed as plastic energy. Further, since the connecting plate is bridged between the beams facing each other in the gap, the yield strength of the connecting plate can be easily adjusted, and the plastic deformation of the connecting plate can be caused at an early stage.

[0007]

【Example】

 Hereinafter, an embodiment of the vibration control structure of the skeleton of the present invention will be described with reference to FIGS. 1 to 7. In this vibration control structure 10 of a frame, beams 12 connected to each other are attached to columns 11 as shown in FIG. The ends 14 of the beams 12 are opposed to each other, and a gap 15 is provided between the ends 14 and 14 of the beams 12 and 12 facing each other.

A rectangular connecting plate 16 is bridged between these end portions 14, 14. In this connecting plate 16, for example, the yield strength of the connecting plate 16 is made smaller than the yield strength of the beam 12 by making the cross section smaller than the cross section of the beam 12. These beams 12 1 and 12 2 are made of, for example, H-shaped steel provided with flanges 17 on the upper and lower sides. The connecting plate 16 is fixed to the outer surfaces of the upper and lower flanges 17 by, for example, a plurality of bolts 18. As shown in the plan view of the building in FIG. 2, such a frame-structure damping structure 10 may be provided on each of the beams 12 around the four horizontal corners of the building body 19.

The characteristic of the stress-deformation of the connecting plate 16 used in the body vibration-damping structure 10 will be described with reference to FIG. In this stress-displacement diagram, the vertical axis represents stress (Q) and the horizontal axis represents displacement (δ), and the stresses of the entire frame 20, frame 21, and connecting plate 16 are plotted. Then, the yielding of the connecting plate 16 is caused at an early stage, the hysteresis hysteresis of the steel material of the connecting plate 16 is positively introduced, and the earthquake input to the frame 21 at the time of an earthquake is reduced.

Here, the normal frame 1 as a whole has a damping performance of about 2% as shown below. E (normal) = (1/2) .QY.delta.Y. (2/100) In the connecting plate 16, as shown below, energy absorption occurs due to plastic energy due to bending deformation. E (connecting plate) = (1 / α) · QY · δY where α is a proof stress ratio between the connecting plate 16 and the frame 21, and when α = 20, absorption of vibration energy is as shown below. .. E (connecting plate) / E (normal) = 5 As described above, the connecting plate 16 absorbs 5 times the normal energy by plastic deformation.

That is, when an earthquake or the like occurs, the normal frame 1 as a whole has an elastic design, and therefore, for example, the origin is symmetric up to the position shown by the alternate long and short dash line in FIG. It makes a round trip to and from the third quadrant. On the other hand, in the entire frame 20 having the connecting plate 16, the position indicated by the alternate long and short dash line in FIG. 3 and a point on the vertical axis indicating the stress (Q) are vertices, and the origin is the symmetry point. It reciprocates on a parallelogram. As described above, in the normal frame 1 as a whole, the energy is not absorbed because it repeatedly reciprocates on a straight line, but in the frame 20 having the connecting plate 16, it reciprocates on a parallelogram and positively moves. It absorbs energy.

The rigidity and yield strength of the connecting plate 16 can be adjusted to be larger or smaller by changing the length, material and plate thickness of the connecting plate 16. Furthermore, by adding normal seismic elements, the rigidity and yield strength of the entire frame can be adjusted. As described above, the rigidity and yield strength of the connecting plate 16, the frame 21, and the entire frame 20 are adjusted while considering the seismic element, and the building structure is designed.

The operation of the vibration control structure of the skeleton will be described with reference to FIG. When the ground vibrates due to an earthquake or the like, the building structure is deformed, causing interlayer deformation on each floor. Here, since the connecting plate 16 has a lower yield strength than the beam 12, it yields earlier and is deformed more than the beam 12 and absorbs energy at the time of earthquake as plastic energy. The plastically deformed connecting plate 16 enters the gap 15.

In such a frame-structure damping structure 10, since the connecting plate 16 is provided between the ends 14 of the beams 12 facing each other, and the gap 15 is provided between the ends 14 of the beams 12. The vibration of the beam 12 is directly transmitted to the connecting plate 16, and the connecting plate 16 yields at an early stage, so that the vibration generated between the connected beams 12 is converted by the connecting plate 16 into energy at the time of earthquake as plastic energy. Be absorbed. Since this plastically deformed connecting plate 16 enters the gap 15, the plastic deformation of the connecting plate 16 is facilitated and the energy is positively absorbed. Further, since the connecting plates 16 are attached to the upper and lower end portions of the beam 12, respectively, the beam absorbs twice as much energy as one connecting plate 16. Therefore, it is possible to enhance the earthquake resistance of the entire frame 20 and enhance the safety.

Since the connecting plate 16 has a lower yield strength than the beam 12, when the beam 12 is repeatedly subjected to a large amount of deformation, the connecting plate 16 yields early and the connecting plate 16 is deformed between the beams 12 and 12. It is possible to positively absorb energy during an earthquake. Thus, since the connecting plate 16 yields early, it is possible to prevent interlayer displacement of the skeleton, prevent residual strain from occurring in the entire frame 20, and improve the safety of the beam 12. By replacing the deformed and yielded connecting plate 16, it is possible to easily cope with the subsequent earthquake. Therefore, interlayer displacement of the building structure can be reduced, permanent strain can be prevented from remaining, and the soundness of the building structure can be maintained.

It should be noted that the connecting plate 16 may be made of extremely soft steel having a low yield strength. Further, although the connecting plate 16 has a rectangular shape as shown in FIG. 5, as shown in FIGS. 6 and 7, the recessed portion 30.31 having a width narrower than both end portions is formed. May be provided. In these recesses 30 and 31, as shown in FIG. 6, a substantially isosceles triangle having an apex near the central portion of the connecting plate 32 may be cut out, and as shown in FIG. It may be a symmetrical arc cut out. With these recesses 30 and 31, the cross-sections of the connecting plates 32 and 33 can be made smaller in yield strength than the cross-section of the beam 12.

[0017]

[Effect of the device]

 As is clear from the above description, according to the structure for damping the structure of the present invention, the connecting plate is provided between the ends of the beams facing each other, and the gap is provided between the ends of the beams. The inter-story deformation of the building is directly transmitted to the connecting plate, and the repeated deformation that occurs between the connected beams is absorbed by the connecting plate. Since this connecting plate penetrates into the gap, the plastic deformation caused by the bending yield of the connecting plate actively absorbs the energy. Furthermore, since the connecting plates are attached to the upper and lower ends of the beam, each plate absorbs twice as much energy as the connecting plate. Since the yield strength of this connecting plate is smaller than that of the beam, when the beam is subjected to a large deformation, the connecting plate yields and can positively absorb energy. In this way, since the connecting plate yields, it is possible to enhance the earthquake resistance of the body and enhance the safety. It is possible to prevent residual strain from occurring in the entire frame and improve the safety of the beam. By simply replacing the deformed and yielded connecting plates, it is possible to easily cope with subsequent earthquakes, so that permanent strain in the building structure is prevented from remaining and the soundness of the building structure can be maintained. It is possible to achieve the effect.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an embodiment of a structure for damping a structure of the present invention.

2 is a cross-sectional view of the entire frame of FIG.

FIG. 3 is a diagram of stress-displacement of the entire frame of FIG. 1, a skeleton, and a connecting plate.

FIG. 4 is a cross-sectional view at the time of the earthquake of FIG.

5 is a front view of the connecting plate of FIG. 1. FIG.

FIG. 6 is a front view of the modified example of FIG.

FIG. 7 is a front view of another modified example of FIG.

FIG. 8 is a conventional stress-displacement diagram.

[Explanation of symbols]

 10 Structural control structure 12 Beams 14 Ends 15 Gap 16 Connecting plate

Claims (1)

[Scope of utility model registration request] 1. A vibration control structure for a building frame, wherein ends of beams connected to each other face each other, a gap is provided between the ends of the beams facing each other, and a bending yield occurs between the beams facing each other. By doing so, the connecting plate that absorbs energy is spanned,
The connecting plate is provided at both upper and lower ends of the opposing beams, and the connecting plate is formed to have a yield strength smaller than the yield strength of the beam.