JPH0988209A - Bearing frame and structure of building frame body using the bearing frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the deformability (toughness) of the whole bearing frame by plastic deformation by bending stress at a time when excess load is applied, and to form structure being easy to absorb earthquake energy and having toughness. SOLUTION: In an approximately rectangular bearing frame 1 mainly bearing a load in the horizontal direction of a building, an upper diagonal member 3 connecting an upper corner and the intermediate section of the vertical frame 2 and a lower diagonal member 4 coupling a lower corner and the intermediate section of the vertical frame 2 are provided, and the upper diagonal member 3 and the vertical frame 2 and the lower diagonal member 4 and the vertical frame 2 are joined through connecting fittings 5 respective. The connecting fitting 5 connecting the upper diagonal member 3 and the vertical frame 2 and the connecting fitting 5 coupling the lower diagonal member 4 and the vertical frame 2 are separated vertically.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load bearing frame and a structure of a building frame structure using the load bearing frame.

[0002]

2. Description of the Related Art Conventionally, it has been practiced to use a substantially rectangular load bearing frame which mainly bears a horizontal load of a building as a part of a frame structure of the building. This load bearing frame 1 is, for example, as shown in FIG. 16, and has an intersection of the neutral axis of the vertical frame 2 and the neutral axis of the upper diagonal member 3, the neutral axis of the vertical frame 2 and the neutral axis of the lower diagonal member 4. The intersections of were almost the same.

[0003]

However, in the load bearing frame 1 having the above structure, the intersection of the neutral axis of the vertical frame 2 and the neutral axis of the upper diagonal member 3 and the neutral axis of the vertical frame 2 and the lower axis of the vertical frame 2 Since the intersection point with the neutral axis of the diagonal member 4 is approximately the same and forms a truss structure, when an excessive load is applied to the load bearing frame 1 due to an earthquake or the like, the compression shaft material forming the load bearing frame 1 buckles and the load bearing strength is increased. There is a risk that the proof strength of the frame 1 will be significantly reduced and the building will collapse.

An object of the present invention is to solve the above-mentioned problems of the conventional example, and when the excessive load is applied, the deformation capacity (stickiness) of the entire load bearing frame is improved by plastically deforming due to bending stress. Providing a load-bearing frame that can have a tough structure that easily absorbs seismic energy. Furthermore, even if plastic deformation occurs, the column bears a vertical load and prevents buckling of the vertical frame. The present invention is to provide a structure of a building frame structure using a load bearing frame.

[0005]

In order to achieve the above object, a load bearing frame of the present invention is a load bearing frame 1 having a substantially rectangular shape which mainly bears a horizontal load of a building.
Upper diagonal member 3 that connects the upper corner and the vertical frame 2 middle part
And the lower diagonal member 4 that connects the lower corner and the vertical frame 2 middle part
And an upper diagonal member 3 and a vertical frame 2, and a lower diagonal member 4 and a vertical frame 2 are connected to each other via a connecting metal member 5, respectively, and a connecting metal member 5 connecting the upper diagonal member 3 and the vertical frame 2, The lower diagonal member 4 and the connecting metal piece 5 connecting the vertical frame 2 are vertically separated from each other. With such a configuration, the intersection X between the neutral axis a of the vertical frame 2 and the neutral axis b of the upper diagonal member 3, and the intersection point of the neutral axis a of the vertical frame 2 and the neutral axis c of the lower diagonal member 4 Y and Y will separate up and down. Therefore, even when an excessive load is applied to the proof frame 1 due to an earthquake or the like, the portion of the vertical frame 2 between the intersection points X and Y is plastically deformed by the bending stress, so that the deformation capacity of the entire proof frame ( The tenacity can be improved, and a tough structure that easily absorbs seismic energy can be obtained.

Further, the lower end of the connecting metal piece 5 connecting the upper diagonal member 3 and the vertical frame 2 and the upper end of the connecting metal piece 5 connecting the lower diagonal member 4 and the vertical frame 2 are inclined obliquely. Is also preferable. By doing so, the horizontal cross-sectional rigidity of the vertical frame 2 and the connecting metal piece 5 combined does not change abruptly at the end of the connecting metal piece 5, so that stress concentration can be relaxed.

Further, the structure of the building frame structure using the load bearing frame of the present invention is a building frame structure using the load bearing frame 1 having the above-mentioned structure, and the load bearing capacity is set adjacent to the pillar 6 of the building. A vertical frame 2 in which the frame 1 is disposed and both diagonal members 3 and 4 of the load bearing frame 1 are connected is disposed in the vicinity of a pillar 6 of a building. With such a configuration, even if an excessive load is applied to the load bearing frame 1 and the vertical frame 2 is plastically deformed, the column 6 bears the vertical load, and the vertical frame 2 buckles. Will be prevented.

[0008]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described below with reference to the embodiments shown in the accompanying drawings. FIG. 1 shows a load bearing frame 1 of the present invention.
Is shown. The load bearing frame 1 is configured by integrating a vertical frame 2 and a horizontal frame 7 into a rectangular frame via a connecting member 8. The load bearing frame 1 is provided with an upper diagonal member 3 that connects the upper corner and the middle portion of the vertical frame 2 and a lower diagonal member 4 that connects the lower corner and the middle portion of the vertical frame 2.

The upper diagonal member 3 and the vertical frame 2 and the lower diagonal member 4 and the vertical frame 2 are connected to each other through separate connecting metal members 5. Connecting hardware 5 for connecting the upper diagonal member 3 and the vertical frame 2, and connecting hardware 5 for connecting the lower diagonal member 4 and the vertical frame 2.
And are vertically separated as shown in FIG.
The intersection X between the neutral axis I of the upper diagonal member 3 and the neutral axis B of the upper diagonal member 3 and the intersection Y of the neutral axis I of the vertical frame 2 and the neutral axis C of the lower diagonal member 4 are set to be separated vertically. .

Here, in the embodiment shown in the accompanying drawings, the vertical frame 2, the horizontal frame 7, and the upper and lower diagonal members 3, 4 are all rectangular in cross section as shown in FIGS. 7 to 10. Each of the vertical frame 2, the horizontal frame 7, and the upper and lower diagonal members 3, 4 has a kerf 20 formed at both ends in the longitudinal direction. Two types of vertical frames 2 are used, a first vertical frame 2a as shown in FIG. 6 and a second vertical frame 2b as shown in FIG. 7, and the kerf 20 on the second vertical frame 2b is used. Has a longer vertical length than the kerf 20 on the first vertical frame 2a.

As the connecting member 8 connecting the vertical frame 2 and the horizontal frame 7, a first upper connecting member 8a as shown in FIG.
And three types of second upper connecting member 8b as shown in FIG. 12 and lower connecting member 8c as shown in FIG. First
Each of the upper connecting member 8a and the second upper connecting member 8b includes a vertical plate-shaped upper fitting connecting piece 9 and an upper fixing piece 10 fixed to an upper end portion of the upper fitting connecting piece 9. Connecting material 8
The upper fitting connecting piece 9 of b has a longer vertical length than the upper fitting connecting piece 9 of the first connecting member 8a.

The lower connecting member 8c has an inverted U-shaped bolt insertion window 11 fixed to the recess of the lower fitting connecting piece 14 in the form of a vertical plate, and the lower fixing piece 12 is further attached to the lower end of the lower fitting connecting piece 14. It is configured by fixing. The lower fixing piece 12 is provided with a bolt insertion hole 13 for inserting a bolt such as an anchor bolt at a position facing the inside of the bolt insertion window 11.

As shown in FIG. 14, the connecting hardware 5 is in the form of a vertical plate, and has an inclined edge portion 1 in which one edge in the vertical direction is inclined.
5, two connecting metal pieces 5 are vertically projected at an intermediate portion of the first vertical frame 2a with a gap therebetween, and the lower edge of the upper connecting metal piece 5 is an inclined edge. The upper edge of the lower connecting hardware 5 is the inclined edge portion 15.

Then, the upper fitting connection piece 9 of the first upper connecting member 8a is fitted into the kerf 20 on the first vertical frame 2a and fixed by welding, and the kerf 20 under the first vertical frame 2a is secured. The lower fitting connecting piece 14 of the lower connecting member 8c is fitted and fixed by welding, and the upper fitting connecting piece 9 of the second upper connecting member 8b is fitted into the kerf 20 on the second vertical frame 2b and then welding. Fixed, the second vertical frame 2
The lower fitting connecting piece 14 of another lower connecting member 8c is fitted into the kerf portion 20 below b, and fixed by welding.
The upper and lower horizontal frames 7 are arranged between the upper and lower ends of the vertical frame 2a and the second vertical frame 2b, respectively, and the kerf portions 20 at both ends of the upper horizontal frame 7 are formed into the first upper connecting members 8 respectively.
It is fitted into the upper fitting connecting piece 9 of a and the upper fitting connecting piece 9 of the second upper connecting member 8b and fixed by welding, and the kerf portions 20 at both ends of the lower horizontal frame 7 are respectively connected to the lower connecting members 8c on both sides. It is fitted into the lower fitting connecting piece 14 and fixed by welding. Further, the upper grooved connecting portion 9 of the second upper connecting member 8b located at the upper corner formed by the second vertical frame 2b and the upper horizontal frame 7 is formed with the cut groove portion 20 on the upper diagonal member 3.
And fixed by welding, and further, by fitting the cut groove portion 20 below the upper diagonal member 3 to the intermediate portion of the first vertical frame 2a, which is in the form of a vertical plate, and by welding. Stick to it. Further, the cut groove portion 2 below the lower diagonal member 4
0 is the lower fitting connecting piece 1 of the lower connecting member 8c located at the lower corner formed by the second vertical frame 2b and the lower horizontal frame 7.
4 and fixed by welding, and further, the cut groove portion 20 on the lower diagonal member 4 is fitted on the lower connecting metal piece 5 in the form of a vertical plate fixed to the intermediate portion of the first vertical frame 2a and welded. To fix. Thus, the proof frame 1 shown in FIG. 1 is formed.

Here, an example in which the vertical frame 2, the horizontal frame 7, and the upper and lower diagonal members 3 and 4 are rectangular steel pipes having a square cross section is shown, but the present invention is not limited thereto. Other cross-sectional shapes may be used. For example, it may have a U-shaped cross-section, and when the upper and lower diagonal members 3, 4 are U-shaped, a C-shaped cross-section is used as the connecting metal 5, for example, the upper and lower diagonal members. It is also possible to squeeze the end portions of 3 and 4 by the amount of the wall thickness and fit the squeezed end portions into the connecting metal piece 5 for welding.

The load bearing frame 1 having the above structure is shown in FIG.
The load bearing frame 1 is mounted on the foundation 30 as shown in FIG. 2, and the load bearing frame 1 is fixed by using anchor bolts erected on the foundation 30. . In this case, the anchor bolt is passed through the bolt insertion hole 13 of the lower fixing piece 12 of the lower connecting member 8c, and the nut is screwed and fixed in the bolt insertion window 11. Further, the upper portion of the load bearing frame 1 is configured such that the upper fixing pieces 10 of the first upper connecting member 8a and the second upper connecting member 8b are applied to the lower surface of the beam 31 and fixed by bolts.

As described above, the load-bearing frame 1 used as a part of the frame structure of the building in this way is the connecting metal member 5 for connecting the upper diagonal member 3 and the vertical frame 2 and the lower diagonal member 4. The vertical axis of the vertical frame 2 and the vertical axis of the vertical frame 2 are separated from each other by vertically separating the vertical metallization 5 from the vertical axis of the vertical frame 2. The intersection Y between the b and the neutral axis c of the lower diagonal member 4 is vertically separated from each other, and as a result, even when an excessive load is applied to the proof frame 1 due to an earthquake or the like, the intersection X and the intersection X of the vertical frame 2 are intersected. Since the portion between Y and Y is plastically deformed by bending stress, the deformation capacity (stickiness) of the entire proof frame 1 can be improved, and a tough structure that easily absorbs seismic energy can be obtained. That is, the excessive load absorbing portion 33 is located between the intersection X and the intersection Y. FIG. 6 is a front view showing a state in which the excessive load absorbing portion 33 between the intersection X and the intersection Y is plastically deformed when an excessive load is applied.

As described above, the lower end of the connecting metal piece 5 connecting the upper diagonal member 3 and the vertical frame 2 and the upper end of the connecting metal piece 5 connecting the lower diagonal member 4 and the vertical frame 2 are respectively. Since the slanted edge portion 15 is obliquely inclined, the horizontal cross-sectional rigidity of the vertical frame 2 and the connecting metal piece 5 does not abruptly change at the end of the connecting metal piece 5, so that stress concentration can be relaxed. Become.

By the way, when the load bearing frame 1 is used as a part of a frame structure of a building, the load bearing frame 1 is arranged adjacent to a pillar 6 of a building as shown in FIG. In this case, the vertical frame 2 (that is, the first vertical frame 2a), in which the both diagonal members 3 and 4 of the load-bearing frame 1 are connected, is further arranged near the pillar 6 of the building.
By doing so, as described above, the load bearing frame 1
Even if an excessive load is applied to the vertical frame 2 and plastic deformation occurs in the excessive load absorbing portion 33 of the vertical frame 2, the vertical load will be borne by the column 6 located near the first vertical frame 2a. Buckling of the vertical frame 2 can be prevented.

Next, a load bearing frame 1 of the present invention shown in FIG.
FIG. 15 is a graph showing the results of the horizontal loading test with the conventional load bearing frame 1 shown in FIG. In FIG. 15, the solid line shows the result of the horizontal load test of the load bearing frame 1 of the present invention, and the alternate long and short dash line shows the result of the horizontal load test of the conventional load bearing frame 1. As is clear from the graph shown in FIG. 15, in the conventional load-bearing frame, when the horizontal load is repeatedly applied, the strength suddenly decreases after passing A in FIG. 15, but in the present invention, it is excessive. It is revealed that the load absorbing portion 33 is plastically deformed by the bending stress, so that the deformation capacity (stickiness) of the entire load bearing frame 1 is improved and a tough structure that easily absorbs seismic energy can be obtained. Further, it is understood that the load bearing frame 1 of the present invention absorbs more energy than the conventional load bearing frame 1.

[0021]

As described above, according to the first aspect of the present invention, as described above, the load bearing frame is a substantially rectangular load bearing frame which mainly bears the load in the horizontal direction of the building. And a lower diagonal member connecting the lower corner and the middle portion of the vertical frame.The upper diagonal member and the vertical frame, and the lower diagonal member and the vertical frame are connected to each other via connecting hardware. , A connecting hardware for connecting the upper diagonal member and the vertical frame,
Since the connecting hardware that connects the lower diagonal member and the vertical frame is vertically separated, the intersection of the neutral axis of the vertical frame and the neutral axis of the upper diagonal member, and the neutral axis of the vertical frame and the neutral axis of the lower diagonal member. Therefore, even if an excessive load is applied to the load bearing frame due to an earthquake or the like, the above-mentioned upper and lower intersections of the vertical frame between the connecting hardware will be plastically deformed by bending stress. Thus, it is possible to improve the deformation capacity (stickiness) of the entire load bearing frame and to provide a tough structure that easily absorbs seismic energy.

According to the invention of claim 2, in addition to the effect of the invention of claim 1, the lower end of the connecting metal member for connecting the upper diagonal member and the vertical frame, the lower diagonal member and the vertical frame. Since the upper end of the connecting metal object that connects the frames is inclined obliquely, the horizontal cross-sectional rigidity of the vertical frame and the connecting metal object does not change rapidly at the end of the connecting metal object, and stress concentration can be relaxed. Is.

Further, in the invention according to claim 3, there is provided a structure frame structure using the load bearing frame according to claim 1 or 2, wherein the load bearing frame is adjacent to a pillar of the building. Since the vertical frame connecting both diagonal members of the load bearing frame is arranged near the pillar of the building, even if an excessive load such as an earthquake acts on the load bearing frame, It is possible to absorb it by plastically deforming between the upper and lower intersections, and as a result, it is possible to improve the proof stress until failure. Even if plastic deformation occurs, the vertical load is borne by the column, and it is possible to prevent buckling of the vertical frame.

[Brief description of drawings]

1 shows a load bearing frame of the present invention, (a) is a front view, (b) is a plan view, (c) is a bottom view, and (d) is a side view.

FIG. 2 is an enlarged front view of the above load bearing frame with part thereof omitted.

FIG. 3 is a side view showing a portion connecting upper and lower diagonal members to the same vertical frame.

FIG. 4A is a side view showing a connection between a second vertical frame and a second upper connecting member, and FIG. 4B is a side view showing a connection between a second vertical frame and a lower connecting member.

FIG. 5 is a front view showing the structure of a building frame structure using the load bearing frame of the present invention.

FIG. 6 is an explanatory diagram showing a case where an excessive load is applied to the load bearing frame and plastic deformation occurs in the excessive load absorbing portion portion of the vertical frame.

FIG. 7 shows a first vertical frame that is a constituent material of a load bearing frame of the present invention, (a) is a side view, and (b) is a plan view.

FIG. 8 shows a second vertical frame that is a constituent material of the above load bearing frame, (a) is a side view, and (b) is a plan view.

FIG. 9 shows a horizontal frame which is a constituent material of the load bearing frame, in which (a) is a side view and (b) is a plan view.

FIG. 10 shows a diagonal member which is a constituent material of the above load bearing frame, (a) is a side view, and (b) is a plan view.

FIG. 11 shows a first upper connecting member which is a constituent member of the load bearing frame, in which (a) is a plan view, (b) is a front view, and (c) is a side view.

FIG. 12 shows a second upper connecting member which is a constituent member of the load bearing frame, in which (a) is a plan view, (b) is a front view, and (c) is a side view.

FIG. 13 shows a lower connecting member which is a constituent material of the load bearing frame of the above, (a) is a plan view, (b) is a front view, (c) is a bottom view, and (d) is. It is a side view.

FIG. 14 is a front view of a connecting metal piece which is a constituent material of the load bearing frame of the above.

FIG. 15 is a graph showing the results of horizontal loading tests of the load bearing frame of the present invention and the load bearing frame of the conventional example.

FIG. 16 is a front view of a load bearing frame of a conventional example.

[Explanation of symbols]

 1 Bearing frame 2 Vertical frame 3 Upper diagonal member 4 Lower diagonal member 5 Connected hardware 6 Pillar a Neutral axis b Neutral axis c Neutral axis X Intersection point Y Intersection point

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Claims (3)

[Claims] 1. A substantially rectangular load-bearing frame that mainly bears a horizontal load of a building, and an upper diagonal member that connects an upper corner and a vertical frame intermediate portion, and a lower corner and a vertical frame intermediate portion. And a lower diagonal member, in which the upper diagonal member and the vertical frame, the lower diagonal member and the vertical frame are connected to each other through the coupling hardware, and the lower diagonal member and the coupling hardware that couples the upper diagonal member and the vertical frame. A load-bearing frame characterized in that the connecting hardware that connects the vertical frame is vertically separated. 2. The lower end of the connecting metal article for connecting the upper diagonal member and the vertical frame and the upper end of the connecting metal article for connecting the lower diagonal member and the vertical frame are each inclined obliquely. The load bearing frame according to Item 1. 3. A building frame structure using the load bearing frame according to claim 1 or 2, wherein the load bearing frame is arranged adjacent to a pillar of the building, and both diagonal members of the load bearing frame. A structure of a building frame structure using a load-bearing frame, characterized in that a vertical frame in which columns are connected is arranged near a pillar of the building.