JPH04143376A - Earthquake resistant frame for structure - Google Patents

Abstract

PURPOSE:To secure the toughness in absorbing any possible horizontal load due to an earthquake or the like by means of deformation in an inner frame by installing each brace equipped with a variable device, making its length alterable, crosswise in the opposite angles of an outer frame, and setting up the inner frame in the crossed part. CONSTITUTION:Each of braces 2, 3 with a variable device, changing each length of these braces 2, 3 by means of a slide of pinch plates, is installed crosswise in the opposite angles of an outer frame 1 consisting of a column 1a and a beam member 1b, and each tip part s rigidly joined to a square inner frame 5 composed of H-steel or the like, thereby constituting an earthquake resistant frame A for a structure. Then, if any possible horizontal load due to an earthquake or the like is added, tensile force acts on one side of these braces 2, 3 and compressive force on the other, respectively, through which one side of these braces 2, 3 is extended, bearing the tensile force, while the other is shortened, thereby making the compressive force so as not to be imposed on the other. With this constitution, the horizontal load is absorbable by means of deformation in the inner frame 5 as these braces 2, 3 are fragilely broken down.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an earthquake-resistant frame for horizontal relics that bears the horizontal load when a horizontal load due to an earthquake (or wind pressure, etc.) acts on a structure.

(Prior art) When a horizontal load is applied to a structure due to an earthquake or a large kite, in order to bear this horizontal load and prevent the structure from collapsing,
Braces are strung across the structure.

Conventionally, this brace is generally as shown in FIG.

This is a structure M made up of a pair of columns 10 and beams 20 placed above and below the columns 10, with braces 30 placed diagonally across the frame M, which is protected against horizontal loads such as earthquakes. Then, this horizontal load is borne by the tensile strength or compressive strength of the brace 30, thereby preventing the frame M from collapsing.

(Problem to be Solved by the Invention) However, when a tensile force is applied to one brace and a compressive force is applied to the other brace as described above, the brace to which the compressive force is applied generally becomes the brace to which the tensile force is applied. A smaller force causes problems such as buckling failure or protrusion out of the plane.

The present invention was made in view of the above-mentioned problems, and its purpose is to provide an earthquake-resistant frame for a structure that can absorb horizontal loads caused by earthquakes and the like and prevent the structure from collapsing. That's true.

(Means for Achieving the Objects) In order to achieve the above objects, the earthquake-resistant frame of the structure of the present invention consists of a pair of columns and beams strung above and below the columns. The present invention is characterized in that braces provided with variable devices for shortening the length are strung across diagonally in a crosswise manner, and an inner frame smaller than the outer frame is disposed at the intersection of the braces.

(Function) According to the above configuration, when a horizontal load due to an earthquake or the like acts on the structure, one brace is expanded to absorb the tensile force, and the other brace is shortened by the variable device to compress it. No more force is applied.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

FIG. 1 is a front view of the earthquake-resistant frame of the structure of the present invention.

The earthquake-resistant frame A of the structure includes an outer frame 1, braces 2.3 installed diagonally across the outer frame 1, and braces 2.3.
3, and an inner frame 5 installed at the intersection of the braces 2.3.

The outer frame 1 is composed of pillars 1a that are erected at predetermined intervals, and beams 1b that span the floors of each floor of the pillars 1a.

Further, braces 2.3 are strung across the diagonal of the frame 1, with the base end connected to the beam member 1b, and the tip end connected to the inner frame 5.
are rigidly connected to each other, and each is provided with a variable device 4.

As shown in FIGS. 2 and 3, in the variable device 4, separated braces 2a, 2b, 3a, 3b are connected by bolts 7a, 7b via two clamping plates 6, One end of the clamping plate 6 is non-slidably fixed to the ends of the braces 2a and 3a with the bolt 7a, and a separated brace 2b is attached to the slide hole 6a at the other end of the clamping plate 6.
3b bolt 7b is inserted and the braces 2b, 3b
are connected so that they can slide freely. Further, the bolt 7b is located on one side of the slide hole 6a so as to be slidable in the direction of the inner frame 5.

Therefore, when compressive force is applied to these braces 2 or 3, the bolts 7b slide through the slide holes 6a of the clamping plate 6 toward the inner frame 5, thereby shortening the braces 2 or 3.

Then, as shown in Fig. 4, when a horizontal load P such as an earthquake is applied to the structure, and a tensile force is applied to one brace 2 and a compressive force is applied to the other brace 3, one brace 2 is expanded. While bearing the tensile force, the other brace 3 is shortened by the variable device 4 so that no compressive force is applied to absorb the horizontal load P.

The inner frame 5 is formed into a rectangular shape by rigidly joining H-shaped steel, square steel pipes, round steel pipes, etc.

FIG. 5 is a front view of an earthquake-resistant frame A of a structure equipped with a variable device according to another embodiment, and the same components as in the first embodiment are designated by the same reference numerals.

As shown in FIG. 6, in this variable gear f4, separated braces 2a, 2b, 3a, 3b are rotatably connected by bolts 7a, 7b via two clamping plates 6, and these separated braces 2a, 2b, 3a, 3b are The braces 2a, 2b, 3a, and 3b are connected with their central axes m being shifted from each other.

Therefore, when a tensile force is applied to one of the braces 2 in the same manner as described above, the clamping plate 6 rotates and separates the braces 2a, 2.
By aligning the central axes m of the braces 2, the braces 2 are stretched to bear the tensile force, and the clamping plate 6 of the other brace 3 rotates to separate the braces 3a and 3b.
By separating the central axes m of the braces 3 from each other, the braces 3 are shortened and no compressive force is applied.

(Effects of the Invention) The present invention has the following effects by having the above configuration.

■ Braces equipped with variable length shortening devices are strung diagonally across the exterior structure consisting of a pair of columns and beams strung above and below the columns, and the intersections of the braces are By arranging an inner frame smaller than the outer frame,
Since the brace equipped with the variable device does not collapse brittlely, it is possible to create an earthquake-resistant frame of a structure that has resilience characteristics with high energy absorption capacity and toughness due to deformation of the internal frame against horizontal loads such as earthquakes. can be provided.

(2) By changing the shape of the inner frame and the cross-sectional shape of the members, it is possible to freely obtain restoring force characteristics as needed.

[Brief explanation of drawings]

Figure 1 is a front view of the earthquake-resistant frame of the structure of the present invention, Figure 2 is an enlarged front view of the variable device, Figure 3 is a plan view of the same, and Figure 4 is a schematic diagram of the earthquake-resistant frame of the structure in a deformed state. Fig. 5 is a front view showing another embodiment of the earthquake-resistant frame of the structure, Fig. 6 is an enlarged front view showing another embodiment of the variable device, and Fig. 7 is an earthquake-resistant structure of the structure in a deformed state. The schematic diagram of the frame, FIG. 8, is a front view of the earthquake-resistant frame of a conventional structure. In the figure, A: Earthquake-resistant frame 1/exterior structure 1a of the structure Column 1b: Beam material 2. 3 Nibrace 4: Variable device 5: Internal frame 6

Claims (1)

[Claims] Braces equipped with variable length shortening devices are strung diagonally across an external frame consisting of a pair of columns and beams strung above and below the columns, and the intersections of the braces are An earthquake-resistant frame for a structure, characterized in that an inner frame smaller than the outer frame is arranged in the structure.