JPS61282560A - Earthquake-proof surface having flexibility - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Field of Industrial Application) This invention is particularly useful in the field of construction of one-story steel-framed buildings or buildings with at most three or four stories. of configuration.

The present invention relates to an earthquake-resistant structure/surface implemented as a single unit, and more particularly to an earthquake-resistant structure/surface having flexibility whose rigidity can be adjusted.

(Prior art) Conventionally, earthquake-resistant structural surfaces using braces are usually made of L-shaped steel or flat steel of about 90 x 90 x 7 in the diagonal direction in planes a and b of the column and beam frames, as shown in the model in Figure 8. A configuration incorporating a brace C made of round steel or the like was common.

In addition, as an earthquake-resistant structural surface capable of achieving rigidity ysm, as shown in the model in Figure 9, two wooden braces C and C, one end of which is connected to one of the left and right diagonals, are arranged symmetrically. In addition, earthquake-resistant structures constructed in a non-intersecting arrangement have also been implemented.

(Technical problem to be solved by this invention) By the way,
2. Regarding earthquake-resistant structural surfaces using braces, it is required to handle the horizontal forces that generally tend to concentrate on the structural surface in a well-balanced manner with general rigid frame bridges, and therefore the rigidity (flexibility) can be adjusted. That is required.

However, in the case of the conventional earthquake-resistant structural surface shown in Fig. 8, the column and beam frames a, b, and brace C both bear and process the horizontal force P as an axial compressive force, so the P-δ diagram is As shown by curve A in the figure, although the initial stiffness and strength were high, there was little deformation, that is, it was difficult to adjust the stiffness. Therefore, it is not suitable as an earthquake-resistant structure for so-called flexible structure buildings.

Moreover, horizontal force concentrates on the braces, causing problems such as the braces breaking or buckling as a result of earthquake damage.

In addition, in the case of the earthquake-resistant structure shown in Figure 9, although it is possible to adjust the rigidity to some extent by changing the angle of brace C,
Since the structure is such that compressive force acts intensively on Brace C, the member size of Brace C must be large enough to withstand the expected compressive force.For example, when using L-beam steel for Brace C, its size is 90X 90X? or 75X
? 5X 13th place was needed. Therefore, large f
It is generally used in buildings where a large horizontal force P is applied, and therefore it has the problem that it is not suitable for steel-framed one-story buildings or small-scale buildings of 3 to 4 floors at most. Ta.

Furthermore, in the case of the compositions shown in FIGS. 8 and 9, it has been pointed out that there is no flexibility in terms of design regarding the arrangement of each brace.

Therefore, it is an object of this invention to be suitable for steel-framed one-story or small-scale buildings of 3 to 4 floors at most, to have sufficient deformation, easy to adjust rigidity, and to reduce horizontal force to ordinary rigid frame bridges. It can be processed in a well-balanced manner, and it is also possible to use some small parts as braces.
Furthermore, it is an object of the present invention to provide an earthquake-resistant structure having a configuration in which the configuration of the braces can be adjusted based on design considerations.

(Means for Solving the Problems) As a means for solving the above problems, the flexible earthquake-resistant structural surface of the present invention has the following advantages: Concerning an earthquake-resistant structure comprising braces 3 arranged within frames 1 and 2.

(a) The brace 3 is constructed as an assembly of a plurality of small pieces that can sufficiently resist tensile force, such as small round steel and flat steel, arranged equally in parallel at predetermined intervals.

(B) Also, the brace 3 is placed in the plane of the column-beam frame 1.2 at diagonal corners 4a, 4a' and 4b on the frame surface 4.
The position where one or both of and 4b' are removed.

Alternatively, they are arranged in a manner that they all intersect in a symmetrical manner.

(c) Then, each contact point between the brace 3 and the column and beam frames 1 and 2 is a flexible pin joint, and the brace 3.
3' mutual intersections are also flexibly connected with pins.

(Function) In other words, the brace 3 is made up of a plurality of aggregates equivalent to the required amount of subdivided brace cross sections, and this is installed within the column and beam frame 1. Various construction methods or adjustments are possible, and the stiffness can be adjusted as a result of the construction method or adjustment.

In addition, the brace 3 is arranged at a position or in a direction in which one or both of the diagonal corners of the column frame 1.2 are removed, and each contact point between the brace 3 and the column and beam frame 1.2 is flexible. Since the brace 3 is made of a pin joint, the brace 3 is only 6g as a tensile member, and one or both of the columns 1 and the beams 2 can be expected to undergo bending deformation, and the deformation of the frame will be large. In other words, the amount of bending deformation that can be caused in the columns 1 and beams 2 can be adjusted by the construction method and arrangement of the braces, that is, the rigidity can be easily adjusted.

By the way, as in the model shown in Figure 7A, brace 3
In the case of a configuration in which only the lower left end of the Brennis 3 is attached to the diagonal 4b and the upper right end is pin-connected to the upper beam 2, only one end of the Brennis 3 can cause bending deformation of the upper beam 2, so its P-δ diagram As shown by the curve (B) in FIG. 6, both initial stiffness and strength are lower than the curve (A) of the conventional example, but the deformation δ is well extended.

In addition, in the case of a structure in which both ends of the brace 3 are removed from the diagonals 4b and 4b' as in the model shown in FIG. 7B, both ends of the brace 3 are connected to the upper and lower beams? , 2 can occur, so the initial stiffness and strength of the P-δ curve, as shown by curve (c) in Figure 6, are lower than those of curve (b), but both are roughly the same. They exhibit the same behavior, and the deformation δ stretches well.

In other words, the difference (
E) can be said to be the difference between the amount of deformation due to only the axial force of the column-beam frame 1.2 and the amount of deformation due to the axial cabrus bending moment.

As mentioned above, tensile force mainly acts on the brace 3, so the brace 3 may have a small cross-sectional area as long as it can withstand the applied tensile force. 75X 75
Where an angle of 9x is required, the angle is 50x9.
It is possible to replace the structure with an assembly of small members such as three flat steel bars or three reinforcing bars with a diameter of 20 mm.

The reason why the intersections of the braces 3 and 3' are connected with pins is to prevent the braces 3 from buckling against the action of alternating compressive forces.

Furthermore, the reason why the braces 3 are arranged in a symmetrical and intersecting manner is to cope with the alternating horizontal forces acting on the beam-column frame 1.2.

(Example) Next, the present invention shown in FIGS. 1 to 5 will be described in detail.

First, the earthquake-resistant structural surface shown in 1st vlJA is as shown in the basic model in Fig. 1B, where only one end of the pair of braces 3.3' is pinned to the diagonal corners 4b and 4a' of the column and beam frame 1.2. However, the other end is removed from the diagonal corners 4a and 4b', crossed symmetrically, and is connected to the upper beam 2 with a pin. In other words, it has the same configuration as the model in FIG. 7A.

Each brace 3, 3' has three pieces (however.

It is constructed as an assembly of small single pieces of material (the number is not limited to this), for example, three 50 x 8 flat bars or 20 medium reinforcing bars. The small single pieces of material are arranged in parallel at predetermined intervals, creating a beautiful geometric design.

The angle of inclination of the braces 3.3' is not limited to the one shown in the example shown in the figure. If the number of braces 3.3' increases and the cross-sectional area of the braces increases, the initial stiffness and strength of the P-δ curve will naturally increase. This point also applies to each of the following examples.

(Second Embodiment) The earthquake-resistant structural surface shown in Fig. 2A is as shown in the basic model shown in Fig. 2B. 4a, 4a' and 4b, 4b' and intersect with each other symmetrically, and both ends of each brace 3.3' are joined to the upper and lower beams 2, 2 by a pin.

In other words, it has the same configuration as the model shown in FIG. 7B.

Of course, each brace 3.3' is constructed as an assembly of three small single pieces, but the number of pieces and the angle of inclination are not limited to the illustrated example.

(Third Embodiment) The earthquake-resistant structure shown in Fig. 3A uses two pairs of braces 3.3', one on each side, as shown in the basic model in Fig. 3B. Only one end of each brace is pin-joined to the diagonals 4a, 4b and h', 4b' so that they intersect symmetrically, and the other end is placed at a position slightly closer to the end than the midpoint between the upper and lower beams 2, 2. It has a bottle-jointed configuration. This is, so to speak, a configuration of a modified application of the model in FIG. 7A.

However, if the beam 2 is an extremely long frame structure and the third
When the vertical dimension in FIG. B is large, one or more pairs of braces 3.3' may also be provided in this intermediate portion. On the contrary, it is also possible to have a configuration in which the apparent dimensions are zero.

(Fourth Embodiment) The basic model of the earthquake-resistant structural surface shown in Fig. 4A is shown in Fig. 4B. Corners 4a, 4a' and 4b, 4b
', the braces are crossed symmetrically, and both ends of each brace are joined to the pillars 1, 1 by means of a pin. This is, so to speak, a configuration example obtained by rotating the model in FIG. 7B by 900 revolutions.

(Fifth Embodiment) The earthquake-resistant structure shown in FIG. 5 basically has the same configuration as the earthquake-resistant structure shown in FIG. In the square shape formed by 3', small braces 5.5' are further incorporated in a criss-cross or non-cross-shape arrangement. The small brace 5.5' has no mechanical meaning and is simply a consideration for the aesthetic aesthetics of the earthquake-resistant structure. Therefore, the same applies to the embodiments shown in FIGS. 2 to 4.

(Effects of the Invention) As described in detail above in conjunction with the embodiments, the flexible earthquake-resistant structural surface according to the present invention allows for easy adjustment of rigidity and sufficient deformation. It has excellent earthquake resistance and can balance horizontal forces with ordinary rigid frame bridges, making it widely applicable to the design and construction of earthquake-resistant buildings.

Furthermore, since the construction method of the braces can be widely adjusted based on design consideration, a wide range of variations can be provided in the architectural design of the building.

Furthermore, the brace is constructed from a single small member that only resists tensile force, and the earthquake-resistant structural surface is achieved with the same cross-section as conventional braces for the embankment surface, making it inexpensive, and the cross-sectional size of the brace is small. Because it is smart, it can be widely used as an earthquake-resistant structure, especially for steel-framed one-story buildings or buildings with three or four floors at most.

[Brief explanation of drawings]

1A, B to 4A, B are elevational views showing an earthquake-resistant structure according to an embodiment of the present invention and its basic model, FIG. 5 is an elevational view of a different earthquake-resistant structure, and FIG. 6 is the P-δ diagram of the earthquake-resistant structure,
FIGS. 7A and 7B are elevational views of a model showing the concept of the present invention, and FIGS. 8 and 9 are elevational views showing conventional models. Applicant: Takenaka Corporation, Patent Attorney: Masahiko Yamana -- ＼j 3 - z Figure 6-8 (Modification) Figure 7 Figure 8 Figure 9 Procedural Amendment 1 (Voluntary) 1988 December 5th

Claims (1)

[Claims] (1) In an earthquake-resistant structural surface consisting of braces arranged within the plane of the column and beam frame, (a) the brace (3) is constructed as an assembly of multiple thin members that resist tensile force, and (b) The brace (3) is placed in the column and beam frame (1) and (2) by removing one or both of the diagonals (4a), (4b) and (4a') (4b') in the same frame plane (4). (c) The contact points between the brace (3) and the column and beam frames (1) and (2) are pin connections, and the intersection points between the braces (3) are A flexible earthquake-resistant structure characterized by the fact that both are connected by pins.