JPH10184075A - Earthquake-resistant wall made of steel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an earthquake-resistant wall, by which seismic force and seismic energy can be burdened effectively even when an opening section is formed, the concentration of stress and strain to the periphery of the opening section can be prevented without installing a special reinforcing means, etc., and the strength of the wall and joint strength at a joining edge section are balanced and which can be assembled by a steel plate having limited plate width. SOLUTION: In the earthquake-resistant wall 1 constituted of a steel plate, installed into the main frame of a structure, used for preventing the deformation and collapse of the structure at the time of an earthquake and made of steel, opening sections 6a-6d are formed at the symmetric places of the peripheral section of the earthquake-resistant wall 1 made of steel, and the earthquake- resistant wall 1 is configured so that rigidity at the place of a cross section is kept approximately constant regardless of a place in the height direction and rigidity at the place of a longitudinal section is kept approximately constant regardless of a place in the horizontal direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for improving the seismic resistance of buildings, civil engineering structures, plant structures, and the like, by applying the force and energy during an earthquake to prevent deformation and collapse of the structures. The present invention relates to a steel earthquake-resistant wall formed of a steel plate in an installed earthquake-resistant wall.

[0002]

2. Description of the Related Art Steel earthquake-resistant walls are described in, for example, the article "Experimental research on steel earthquake-resistant walls (part 1) )), It consists of a steel plate and reinforcing ribs, and has a structure that has been studied and implemented for a long time.

[0003] An example of such a conventional steel earthquake-resistant wall (hereinafter simply referred to as an earthquake-resistant wall) is shown in FIG. 8 (prior art 1). In the figure, reference numeral 1 denotes an earthquake-resistant wall having a wall made of a steel plate 2; The stiffeners 4 are arranged at an appropriate pitch according to the thickness, and are installed in a main frame formed by left and right steel columns 11 and upper and lower steel beams 12. The steel sheet 2 used to be a normal steel sheet before, but recently a low yield point steel sheet (a steel sheet having a yield strength of 1/2 to 1/3 that of a normal steel sheet) that can more effectively absorb energy is used. It is supposed to be.

[0004] The steel plate 2 is generally several mm to 10 mm in size.
The thickness of the steel plate is used.
When a force is applied to the stiffener, buckling occurs and the required strength cannot be obtained. Therefore, the stiffeners 4 for preventing buckling are provided at appropriate intervals as described above. In addition, the joining edge of the earthquake-resistant wall 1 is usually bolted to the steel column 11 and the steel beam 12, and the bolting method includes an end plate method (reference numeral 5 in FIG. 8) and a shear bolt method. There is.

[0005] As a relatively recent technology, Japanese Patent Laid-Open No.
A method of using a normal steel plate and a low-yield-point steel plate by dividing the wall surface into two or using two superposed sheets as disclosed in Japanese Patent No. 17557 has been proposed (prior art 2).

[0006]

The steel earthquake-resistant wall of the prior art 1 has the following problems. (1) The earthquake-resistant wall 1 has a uniform structure in the main frame surrounded by the steel columns 11 and the steel beams 12, and has no openings through which equipment piping, ducts and the like pass. As shown in FIG. 9, when the opening 6 is forcibly provided, the earthquake-resistant wall 1 is only effective in the range indicated by the bearing surface in spite of originally anticipating the bearing strength of the entire wall. Has a structural problem that only the effective portion is deformed and the other portions are not deformed.

(2) In order to make the proof stress behave as a whole wall, it is necessary to provide an appropriate reinforcing means 7 in the opening 6 as shown in FIG. There is a problem that not only is processing and assembly extremely troublesome, but also that concentration of stress and strain is liable to occur at the corners around it.

(3) Even if the opening 6 is reinforced, at the joint edge with the steel column 11 or the steel beam 12, the joint edge is not reduced even though the strength of the earthquake-resistant wall 1 is not reduced by the reinforcement. Since the length of the portion is reduced by the opening 6, the joint strength between the steel column 1 and the steel beam 12 and the steel plate 2 constituting the earthquake-resistant wall 1 becomes a problem.

(4) Normally, the upper limit of the width of a steel plate is limited due to transportation restrictions, and in the case of an earthquake-resistant wall exceeding 3 m, it is not possible to manufacture a steel plate from a single plate as shown in FIG. Difficulty requires labor and costly splicing.

[0010] Further, in the prior art 2, there is a novelty in that a normal steel plate and a low yield point steel plate are used together for the earthquake-resistant wall, but the problem of the opening has not been solved yet.

The present invention has been made to solve the above-mentioned problems, and has as its object to obtain a steel earthquake-resistant wall having the following functions. (1) Even when an opening is provided, seismic force and seismic energy can be effectively borne. (2) A special reinforcing means or the like is not required for the opening, and the opening and the earthquake-resistant wall have no concentration of stress and strain. (3) The strength of the shear wall and the strength of the joint at the joint edge are balanced. (4) A structure that can be assembled with a steel plate having a limited plate width.

[0012]

[Means for Solving the Problems]

(1) The steel earthquake-resistant wall according to the present invention is provided with an opening at a symmetrical position around the steel earthquake-resistant wall made of a steel plate, and the rigidity at the cross-sectional position is substantially constant regardless of the position in the height direction. Further, the rigidity at the vertical cross-sectional position is substantially constant irrespective of the position in the horizontal direction.

(2) The steel plate constituting the wall of (1) is
Depending on the position of the opening, the steel sheet was made of a normal steel sheet, a low yield point steel sheet having a lower yield point than the normal steel sheet, or both a normal steel sheet and a low yield point steel sheet.

(3) An opening is provided at a symmetrical position in the periphery of the steel earthquake-resistant wall, and a portion adjacent to the opening and forming a joining edge to the main frame is made of a plain steel plate. The other part is constituted by a low yield point steel sheet having a lower yield point than the ordinary steel sheet.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION When an opening is provided by cutting a part of an earthquake-resistant wall partitioned by a stiffener, the structure of the structure at the time of the earthquake is such that the left and right steel columns and the upper and lower steel beams are substantially symmetrically deformed. Therefore, it is desirable that the positions of the openings are also arranged substantially symmetrically. Note that the opening does not necessarily need to be completely open, and there may be minor partitions as long as the effect on the deformation of steel columns and beams, and even the shear walls is negligible. .

Since the main forces and deformations acting on the earthquake-resistant wall are the shearing force and the shear deformation at the time of the earthquake, as shown in FIG. 7, a section passing through the opening 6 of the earthquake-resistant wall 1 (in the case of a transverse section, A
-A, C-C for a longitudinal section) and other sections (for example, BB for a transverse section, D for a longitudinal section)
-D) is desirably substantially equal in strength.
Therefore, if the steel sheets constituting the AA and CC sections have high strength, and the steel sheets constituting the BB section and DD section include low-strength steel sheets, the AA section and B section The balance of the proof stress between the -B section, the CC section and the DD section is maintained, and the uniformity as the earthquake-resistant wall can be secured. Hereinafter, an embodiment of the present invention based on the above consideration will be described.

Embodiment 1 FIG. 1 is a schematic view showing a state in which the earthquake-resistant wall according to Embodiment 1 of the present invention is installed in a main frame of a structure, and FIG. 2 is a schematic view of the earthquake-resistant wall in FIG. 8 and 9 are denoted by the same reference numerals, and description thereof will be omitted. Further, a steel sheet 2 having a high yield point is indicated by a hatched hatch, and a steel sheet 3 having a lower yield point than the steel sheet 2 is indicated by a dot hatch.

In this embodiment, the openings 6a and 6a are located at symmetrical positions of the four corners of the earthquake-resistant wall 1 defined by the stiffeners 4.
b, 6c and 6d. And the steel plate between the openings 6a and 6b, 6c and 6d on the same cross section and between the openings 6a and 6c, 6b and 6d on the same vertical cross section (therefore, it becomes the joining edge to the main frame) Each of the steel plates is a normal steel plate 2, and a central portion surrounded by the normal steel plates 2 is a low yield point steel plate 3 to constitute the earthquake-resistant wall 1. The earthquake-resistant wall 1 is housed in the main frame, is bolted to the steel column 11 and the steel beam 12 via the end plate 5 provided at the joint edge, and is installed on the main frame.

(Example) In this example, a steel sheet having a thickness of 16 mm and a yield point of about 235 N / mm ² is used as the ordinary steel sheet 2, and a sheet thickness of 12 mm and a yield point of 100 N / Stiffener 4 using a steel plate of about mm ²
The four corners defined by the stiffeners 4 were cut out to form openings 6a to 6d, thereby forming the earthquake-resistant wall 1. For the stiffener 4, a steel material having a yield point substantially equal to that of the steel column 11 and the steel beam 12 (for example, about 240 ^N / mm ² ) was used.
Then, the end plate 5 was housed in a main frame having a width of 7 m and a height of 2.6 m, and the end plate 5 was mounted on the steel column 11 and the steel beam 12 by bolts.

FIG. 3 is a schematic view showing another example of the earthquake-resistant wall 1 according to the present embodiment. In addition, in this example, since the plate thickness of the ordinary steel plate 2 and the low yield point steel plate 3 is thin, the case where the pitch of the stiffeners 4 is arranged fine is shown. In the present example, the left and right central portions of the earthquake-resistant wall 1 are vertically cut out by two sections each to form openings 6a and 6b, and the upper and lower central parts are horizontally cut out by three sections respectively to form openings 6c and 6c. 6d is formed. The three sections on both sides of each of the openings 6a to 6d are defined as ordinary steel plates 2, and a central portion surrounded by the ordinary steel plates 2 is configured as a low yield point steel plate 3 to constitute the earthquake-resistant wall 1.
An end plate 5 provided at the joint edge of the ordinary steel plate 2 is installed in the main frame.

In the present embodiment as described above, the low yield point steel plate 3 functions as a uniform earthquake-resistant wall, and the reduction in the proof stress against the entire wall can be dealt with by increasing the plate thickness. . Further, the earthquake-resistant wall 1 is composed of the steel column 11 and the steel beam 1.
Since the portions transmitting stress to the steel plate 2 are all made of the ordinary steel plate 2, the joining range can be smaller than when the low yield point steel plate 3 is in the peripheral portion. That is, the opening 6
Even if the length of the joining edge portion is shortened by providing a to 6d, the joining performance can be ensured. Further, since the openings 6a to 6d are made of the ordinary steel plate 2,
It is not necessary to reinforce the openings 6a to 6d.

In the present embodiment, the rigidity of each of the transverse section and each of the longitudinal sections of the earthquake-resistant wall 1 is substantially equal, the balance is maintained, and the uniformity of the earthquake-resistant wall is ensured. Therefore, in the event of an earthquake, the earthquake-resistant wall 1 is deformed following the deformation of the steel column 11 and the steel beam 12, and the low yield point steel plate 3 yields earlier than the structural frame or the ordinary steel plate 3 to reduce the seismic energy. Due to absorption, plasticization and fatigue damage of the structure can be reduced. At this time, the ordinary steel plate 2
Is usually in the elastic range, the deformation generated in the ordinary steel plate 2 returns to the original position according to the elastic behavior, so that the safety of the structure can be ensured.

Embodiment 2 FIG. 4 is a schematic view showing a state in which the earthquake-resistant wall of Embodiment 2 according to the present invention is installed in a main frame of a structure, FIG. 5 is a schematic view of the earthquake-resistant wall of FIG. 4, and FIG. It is a schematic diagram of the earthquake-resistant wall of another example. The same parts as in the first embodiment are denoted by the same reference numerals, and
Description is omitted. Openings 6a to 6d in the present embodiment
The arrangement position of the ordinary steel plate 2, the low yield point steel plate 3, and the stiffener 4 are the same as those of the first embodiment (FIGS. 1 to 3), but in the present embodiment, the end plate 5 of the first embodiment is used. In place of the above, a bolt insertion hole 7 is provided at a joint edge portion made of the ordinary steel plate 2 of the earthquake-resistant wall 1, and a connection fitting 13 is provided on the steel column 11 and the steel beam 12, and connected by the bolt 8 inserted into the bolt insertion hole 7. It is configured to be bolted to the steel column 11 and the steel beam 12 via the metal fitting 13.
The operation and effect of the present embodiment are also the same as those of the first embodiment, and a description thereof will be omitted.

According to the present invention having the above-described structure, the portion that is plastically deformed during an earthquake is selectively formed of a normal steel plate and a low-yield-point steel plate having a lower yield point than the normal steel plate, thereby providing an effective method. As a result, it is possible to obtain high energy absorption, proof stress, and stress transmission, and further, to secure the joining performance to the main frame.

[0025]

【The invention's effect】

(1) The steel earthquake-resistant wall according to the present invention is provided with an opening at a symmetrical position around the steel earthquake-resistant wall made of a steel plate, and the rigidity at the cross-sectional position is substantially constant regardless of the position in the height direction. In addition, since the rigidity at the vertical cross-sectional position is almost constant regardless of the horizontal position, the rigidity in the horizontal and vertical directions is almost equal, the balance is maintained, and the Nature is secured. for that reason,
At the time of an earthquake, a part of the structure yields earlier than the frame of the structure and effectively absorbs seismic energy, so that plasticization of the structure and fatigue damage can be reduced.

(2) The steel sheet constituting the wall of (1) may be a normal steel sheet, a low yield point steel sheet having a lower yield point than the normal steel sheet, or a normal steel sheet and a low yield point steel sheet depending on the position of the opening. Therefore, the same effect as the above (1) can be obtained.

(3) An opening is provided at a symmetrical position in the peripheral portion of the steel earthquake-resistant wall made of a steel plate, and a portion adjacent to the opening and forming a joining edge to the main frame is made of a normal steel plate. Since the other parts are made of a low yield point steel sheet having a lower yield point than ordinary steel sheets, the above-mentioned effect (1) is obtained, and special reinforcement is not required, and stress and strain may be concentrated. A non-opening can be obtained, and a shear-resistant wall in which the strength of the wall and the strength of the joint at the joint edge to the main frame are balanced can be realized. Further, since the earthquake-resistant wall is formed of two types of steel plates, a normal steel plate and a low yield point steel plate, each steel plate can be formed of a narrow material. For this reason, the earthquake-resistant wall can be manufactured from a steel plate having a limited width, and it is not necessary to perform costly splicing.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a state in which a shear wall according to Embodiment 1 of the present invention is installed in a main frame of a structure.

FIG. 2 is a schematic view of the earthquake-resistant wall of FIG.

FIG. 3 is a schematic diagram illustrating another example of the earthquake-resistant wall of the first embodiment.

FIG. 4 is a schematic diagram showing a state in which the earthquake-resistant wall according to Embodiment 2 of the present invention is installed in a main frame of a structure.

FIG. 5 is a schematic view of the earthquake-resistant wall of FIG.

FIG. 6 is a schematic diagram showing another example of the earthquake-resistant wall of the second embodiment.

FIG. 7 is a schematic diagram for explaining the horizontal strength and the vertical strength of a shear wall having an opening.

FIG. 8 is a schematic view of an example of a conventional earthquake-resistant wall.

FIG. 9 is a schematic view of a conventional example having an opening.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Earthquake-resistant wall 2 Normal steel plate 3 Low yield point steel plate 4 Stiffener 5 End plate 6a-6d Opening 7 Bolt insertion hole

────────────────────────────────────────────────── ─── front page continued (51) Int.Cl. ⁶ identifications FI E04B 2/56 605 E04B 2/56 605J 611 611B 622 622B 622H 632 632A 632H 641 641Z 641G 643 643A

Claims (3)

[Claims] 1. A steel earthquake-resistant wall which is formed of a steel plate and is installed in a main frame of a structure to prevent deformation and collapse of the structure during an earthquake, wherein a symmetry of a periphery of the steel earthquake-resistant wall is provided. An opening is provided at the position, so that the rigidity at the cross-sectional position is substantially constant regardless of the position in the height direction, and the rigidity at the vertical cross-sectional position is substantially constant regardless of the position in the horizontal direction. A steel shear wall. 2. The steel plate forming the wall is made of a normal steel plate, a low yield point steel plate having a lower yield point than the normal steel plate, or both a normal steel plate and a low yield point steel plate according to the position of the opening. The steel earthquake-resistant wall according to claim 1, characterized in that: 3. A steel earthquake-resistant wall installed in a main frame of a structure to prevent deformation and collapse of the structure during an earthquake, wherein an opening is provided at a symmetrical position around the steel earthquake-resistant wall. Provided, a portion adjacent to the opening and forming a joining edge to the main frame is formed of a normal steel plate, and the other portion is formed of a low yield point steel plate having a lower yield point than the normal steel plate. And steel shear walls.