KR20080074226A - Load bearing frame - Google Patents

Abstract

A load bearing frame which prevents buckling of a diagonal brace and breaking of a joint, and has a high deformation capacity. The load bearing frame (1) comprises two column element (2, 3), two frame elements (4, 5) and four diagonal braces (6-9). The joint (41) between the column element (3) and the frame element (4) is separated a distance L1 from the joint (43) between the upper-most diagonal brace (6) and the column element (3), and the joint (48) between the column element (3) and the frame element (5) is separated a distance L2 from the joint (47) between the lower-most diagonal brace (9) and the column element (3).

Description

Load bearing frame {LOAD BEARING FRAME}

The present invention relates to a load bearing frame used to form a wall of a building.

The general strength frame has a substantially rectangular shape in which both ends of two pillars are connected to two frame members, respectively, and has a truss structure in which the two pillars are obliquely connected to a plurality of inclined members (see, for example, Patent Documents 1 and 2). ). Here, in the conventional load bearing frame, the connection point between the inclined material and the pillar material disposed at the uppermost and lower parts coincides with the corner portion of the frame. In the bearing frame of this structure, the force is smoothly transmitted, but when excessive horizontal load is applied, stress concentrates on the inclined member and the connecting portion, so that the buckling of the inclined member and the breakage of the connecting portion occur early and the deformation capacity of the entire frame is generated. There is a problem that this is small. In order to solve this problem, it is conceivable to increase the strength (cross section performance) of the inclined material and the rigidity of the connecting portion. In this case, however, the maximum strength increases but the deformation ability (stickiness) of the entire frame decreases, so that the entire frame may collapse rapidly after the load reaches the maximum. Moreover, as another solution of the said problem, it is thought that spaced apart the connecting part of a slope material and a pillar material up and down (for example, refer patent document 3). In the bearing frame of this structure, when the horizontal load is applied, the warp member is plastically deformed in the axial direction, and the pillar member is also bent and plastically deformed, so that the overall deformability of the frame is improved.

Patent Document 1: Japanese Unexamined Patent Publication No. 2002-30745 (Fig. 1)

Patent Document 2: Japanese Unexamined Patent Publication No. 2004-116036 (Fig. 1)

Patent Document 3: Japanese Patent No. 2942481 Specification (Fig. 1)

However, in the bearing frame of this structure, when an excessive horizontal load is applied, the pillar member is plastically deformed by bending, so that the bearing force for maintaining the load in the vertical direction is significantly reduced. Therefore, this strength frame cannot be used as a main structure of a building, and can only be arrange | positioned in the vicinity of the other pillar material which supports a vertical load.

Therefore, the main object of the present invention is to provide a load bearing frame having a high deformation ability while suppressing the occurrence of buckling of the inclined member and breakage of the connecting portion.

The bearing frame of the present invention includes a first frame member, a second pillar member, a first frame member connecting one end of each of the first pillar member and the second pillar member, the first pillar member, and the second pillar member. A load bearing frame having a second frame member that connects respective other ends of a pillar material, wherein the connection position is different from both ends of the first pillar material and the position is other than both ends of the second pillar material, and the second position is higher than the connection position. The first inclined member which connects the position of the one end side of a pillar material, and the connection position other than the both ends of the said 1st pillar material, and positions other than the both ends of the said 2nd pillar material, and the other end side of a said 2nd pillar material rather than the said connection position. The second inclined member which connects the position of is provided about one or several connection positions, and the connection point of the said 1st inclined member arrange | positioned at the one end side of the said 2nd pillar material, and the said 2nd pillar material is A connection point between the first inclined member and the second pillar member spaced apart from the connection point of the second pillar member and the first frame member and disposed at the other end side of the second pillar member is the second pillar member and the first pillar member. It is characterized by being separated from the connection point of 2 frame materials.

Here, the connection point between the first inclined member and the second pillar member represents the intersection of the extension line of the central axis of the first inclined member and the central axis of the second pillar member, and the connection point between the second pillar member and the first frame member is the second pillar member. The intersection of the central axis and the central axis of the first frame member is shown, and the connection point of the second pillar member and the second frame member is the intersection of the central axis of the second pillar member and the central axis of the second frame member.

According to this configuration, even when a horizontal load (load in the direction perpendicular to the pillar member) is applied to the load bearing frame, the horizontal load is not directly transmitted to the inclined member, but through the pillar member between the corner portion of the frame and the inclined member. Since it is transmitted indirectly, the occurrence of excessive stress on the inclined material and the connecting portion is suppressed. In addition, the rigidity of the frame becomes smaller and easier to deform than the conventional frame where the connection point between the inclined material and the pillar material coincides with the corner portion of the frame, thereby preventing sudden collapse after reaching the maximum load. Therefore, in this invention, the early generation of buckling of the inclined material and breakage of a connection part is suppressed, and the energy absorption performance which is excellent in the deformation performance in the whole frame is obtained.

Further, in the proof frame of the present invention, the distance between the connection point of the first inclined member and the second pillar member disposed on the one end side of the second pillar member, the distance between the connection point of the second pillar member and the first frame member, And a distance between a connection point of the first inclined member and the second pillar member disposed on the other end side of the second pillar member, and a connection point of the second pillar member and the second frame member is equal to the total length of the second pillar member. The distance corresponding to 5 to 20% may be sufficient.

According to this configuration, it is possible to suppress the early generation of buckling of the inclined material and breakage of the connecting portion, and to prevent the internal load of the entire frame from being greatly reduced.

Moreover, in the proof frame of this invention, the position other than the both ends of the said 1st frame material, and the position other than the both ends of the said 2nd frame material are connected, and also the reinforcement material joined to the said 1st inclination material and the 2nd inclination material is further connected. You may be provided.

According to this configuration, even if the length of the inclined material is long compared to the frame height (rectangular frame height) (when the ratio of the frame width and height is large), the buckling strength of the inclined material can be improved. Therefore, the yield strength of the whole frame can be improved.

In addition, the bearing frame of the present invention further includes a connecting member disposed between the first and second pillar members and the first and second inclined members, wherein the connecting member is formed of the first and second pillar members. It may be fixed to the said 1st and 2nd pillar material in the fixed position spaced inwardly from a pillar corner part.

According to this configuration, even when the force in the direction away from the pillar material acts on the inclined material, energy is absorbed by the plastic deformation of the connecting member. Therefore, the yield strength of the whole frame is improved.

In the proof frame of the present invention, the distance between the pillar corner portions of the first and second pillar materials and the fixed position may be a distance corresponding to 20 to 30% of the side widths of the first and second pillar materials.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a schematic configuration of a bearing frame according to a first embodiment of the present invention. Fig. 1A is a front view, Fig. 1B is a bottom view, and Fig. 1C is Side view.

2 is an enlarged view of the vicinity of a connecting portion between the pillar and the connecting member.

3 is a cross-sectional view taken along the line III-III of FIG.

4 is a view showing a deformed state of the connecting member.

Fig. 5 is a diagram showing a schematic configuration of a bearing frame according to a second embodiment of the present invention. Fig. 5A is a front view, Fig. 5B is a bottom view, and Fig. 5C is Side view.

Fig. 6 is a diagram showing fixed conditions and load conditions of the frame in the evaluation test.

7 is a diagram illustrating a result of an evaluation test.

[Description of the code]

1, 01: proof frame

2, 3: pillar material

4, 5: frame material

6, 7, 8, 9: inclined material

10: connecting member

102, 103: reinforcement

EMBODIMENT OF THE INVENTION Hereinafter, preferred embodiment of this invention is described, referring drawings. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a schematic configuration of a bearing frame according to a first embodiment of the present invention. Fig. 1A is a front view, Fig. 1B is a bottom view, and Fig. 1C is Side view. 2 is an enlarged view of the vicinity of a connecting portion between the pillar and the connecting member. In FIG. 2, although the vicinity of the connection part of the pillar material 3 and the connection member 10 is shown, the structure of the vicinity of the connection part of the pillar material 2 and the connection member 10 is the same. 3 is a cross-sectional view taken along the line III-III of FIG.

The proof frame 1 (hereinafter referred to as the frame 1) shown in FIG. 1 is a steel frame for steel house. The frame 1 has two pillar materials 2 and 3, two frame materials 4 and 5, and four warp members 6 to 9. The pillar materials 2 and 3 and the frame members 4 and 5 are square tube members (see Fig. 2) having a rectangular cross section, and the inclined members 6 to 9 are members of an open cross-sectional shape.

The two pillar materials 2 and 3 extend in the vertical direction and are arranged in parallel with each other at predetermined intervals. The two frame members 4 and 5 are arranged horizontally and connect the upper or lower ends of the column members 2 and 3, respectively. Therefore, the outer shape of the frame 1 is comprised by the pillar material 2 and 3 and the frame material 4 and 5 in substantially rectangular shape.

The four inclined members 6 to 9 connect the positions other than the upper end and the lower end of the pillar materials 2 and 3 via the connecting member 10. Here, the inclined members 6 to 9 and the connecting member 10 are joined by spot welding, and in Fig. 1, the joining position is shown by a circle mark (○ mark). In addition, the connecting member 10 and the pillar materials 2 and 3 are joined by screwing as mentioned later.

The inclined materials 6 to 9 are arranged in order from above to below. Incidentally, the inclined members 6 and 8 are inclined so that their left ends are lower than the right end and are arranged in parallel with each other, and the inclined members 7 and 9 are inclined so that their right ends are lower than the left end. It is also arranged parallel to each other.

More specifically, the inclined member 6 has a distance (a point of intersection between the pillar member 3 and the frame member 4) (the intersection of the central axis of the pillar member 3 and the central axis of the frame member 4). The connecting point 43 of the pillar member 3 spaced downward by L1), and the connecting point 42 of the pillar member 2 and the frame member 4 (the central axis of the pillar member 2 and the frame member 4). Intersect of the central axis of]] connects the connection point 44 of the pillar member 2 spaced downward by a distance (L1 + L3). Here, for example, the state in which the inclined member 6 and the pillar member 3 are connected at the connection point 43 means that the intersection point of the extension line between the central axis of the pillar member 3 and the central axis of the inclined member 6 is used. The state which intersects at the connection point 43 is shown.

In addition, the inclined material 7 is connected to the connection point 44 of the column member 2 spaced downward from the connection point 42 by the distance (L1 + L3), and by the distance (L1 + 2 × L3) from the connection point 41. Connect the connection point 45 of the column member 3 spaced downward. Similarly, the inclined material 8 is connected to the connection point 45 of the pillar member 3 spaced downward by the distance (L1 + 2 × L3) from the connection point 41, and the distance (L1 + 3 × L3) from the connection point 42 Connect the connection points 46 of the pillar material 2 spaced downward by). The inclined member 9 has a connection point 46 of the pillar member 2 spaced downward from the connection point 42 by a distance L1 + 3 × L3, and a connection point of the pillar member 3 and the frame member 5 ( 48) Distance from the connection point 47 (the connection point 41 of the pillar member 3 spaced upwardly by the distance L2 from the intersection of the central axis of the pillar member 3 and the central axis of the frame member 5) Coincides with the connection point of the column member 3 spaced downward by L1 + 4 × L3).

In this embodiment, the distance L1 between the connection point 41 of the pillar material 3 and the frame material 4, and the connection point 43 of the inclined material 6 and the pillar material 3 arrange | positioned upwards Is the distance corresponding to 8.8% of the full length of the pillar material 3. Moreover, the distance L2 between the connection point 48 of the pillar material 3 and the frame material 5, and the connection point 47 of the inclined material 9 and the pillar material 3 arrange | positioned below is the pillar material It is the distance corresponding to 15.8% of full length. Here, when the distances L1 and L2 are less than 5% of the total length of the pillar material 3, the stresses at the connecting portion between the inclined member and the pillar member become excessive and buckling of the inclined member and breakage of the connecting portion occur early. . On the other hand, when the distances L1 and L2 are the distances exceeding 20% of the total length of the pillar material 3, the force transmitted to the inclined material is reduced and the strength of the entire frame is greatly reduced. Therefore, it is preferable that distance L1, L2 is a distance corresponding to 5 to 20% of the total length of the pillar material 3.

As shown in Fig. 2, the connecting member 10 is a member having an inverted c-section, and eight screw holes 10a (see Fig. 3) are formed on one side thereof. In addition, in the mounting position of the connection member 10 in one side surface of the pillar materials 2 and 3, eight screw holes 2a and 3a corresponding to the eight screw holes 10a of the connection member 10 (FIG. 3) is formed. Therefore, as shown in Fig. 3, the connecting member 10 has the screw hole 10a and the screw hole 2a of the pillar material 2 or the screw hole 3a of the pillar material 3 coincident with each other. In the state is screwed by the screw (11).

In addition, when the width | variety of the one side surface of the pillar materials 2 and 3 and the one side surface of the connection member 10 is D, the connection member 10 is a screw in the position spaced apart by the distance C from both ends inside. Is fastened. That is, the screw holes 2a, 3a, and 10a are formed at a position spaced apart by the distance C from the column corner portion. Here, it is preferable that the distance C between a pillar corner part and a screw fastening position is a distance corresponding to 20 to 30% of the width D of the inner side surfaces of the pillar materials 2 and 3. As described above, screwing the connecting member 10 at a position spaced apart from the column corner by a predetermined interval is as shown in FIG. 4, in the direction of spaced apart from the pillar materials 2 and 3 (arrow direction in FIG. 4). This is for absorbing energy by the plastic deformation of the connection member 10 when the force to the incline acts on the inclined material. In Fig. 4, the connecting member 10 before plastic deformation is shown by a broken line, and the connecting member 10 after plastic deformation is shown by a thick line.

Next, the proof frame according to the second embodiment of the present invention will be described with reference to FIG. Fig. 5 is a diagram showing a schematic configuration of a bearing frame according to a second embodiment of the present invention. Fig. 5A is a front view, Fig. 5B is a bottom view, and Fig. 5C is Side view.

The difference between the load bearing frame 101 (hereinafter referred to as the frame 101) of the second embodiment and the frame 1 of the first embodiment further includes two reinforcing members 102 and 102. Since the other structure of the frame 101 is the same as that of the frame 1, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

The two reinforcing materials 102 and 103 are flat member. The reinforcement material 102 is arrange | positioned at the front surface of the frame 101, connects the center part of the frame material 4 and the center part of the frame material 5, and joins to the center part of the inclination materials 6-9. It is. Similarly, the reinforcement material 103 is arrange | positioned in the inner surface of the frame 101, connects the center part of the frame material 4 and the center part of the frame material 5, and also to the center part of the inclination materials 6-9. It is joined.

Next, the evaluation test and the results of the frames 1 and 101 will be described with reference to FIGS. 6 and 7. Fig. 6 is a diagram showing fixed conditions and load conditions of the frame in the evaluation test. Fig. 7 shows the test results and shows the relationship between the shear strain angle and the horizontal load (envelope of the shear strain angle-horizontal load curve). Here, the evaluation test was performed by repeatedly applying a horizontal load to the upper end of the frames 1 and 101 in the state which fixed the lower end of the frames 1 and 101. FIG. In addition, as a comparative example, the same test was performed also about the conventional frame besides the frame 1,101.

In the conventional frame, the connection part is broken and finally reached. On the other hand, in the frame 1, the connecting portion is not broken, and as can be seen from the test results in FIG. 6, the deformation capacity and the maximum load are significantly higher than in the conventional frame. And finally, the frame 1 plastically buckled, and finally reached the end. However, in the frame 101 to which the reinforcing material was added, not only the breakage of the connecting portion but also the buckling of the inclined material did not occur, and a higher energy absorption performance was obtained than the frame 1.

As described above, in the frames 1 and 101 of the present embodiment, even when the horizontal load is applied, the horizontal load is not directly transmitted to the inclined members 6 to 9. The horizontal load is applied to the pillar material (part corresponding to the connection point 41 and the connection point 43 of the pillar material 3 and the connection point 47 and the connection point 47 of the pillar material 3) between the corner portion of the frame and the inclined material. Since it is transmitted indirectly through the corresponding portion between the 48, generation of excessive stress to the inclined members 6 to 9 and the connecting portion is suppressed. In addition, the rigidity of the frame becomes smaller and easier to be deformed than the conventional frame in which the connecting portion of the inclined material and the pillar material coincides with the corner portion of the frame, thereby preventing sudden collapse after reaching the maximum load. Therefore, in the present invention, early generation of buckling of the warp members 6 to 9 and breakage of the connecting portion are suppressed, and an energy absorption performance having excellent deformability in the entire frame is obtained.

In addition, the frames 1 and 101 of the present invention can realize the balanced energy absorption performance of the entire frame by delaying the occurrence of buckling of the inclined material and breakage of the connecting part, rather than a structure that absorbs energy by bending plastic deformation of the pillar material. . Moreover, since the strength with respect to the load of a perpendicular direction does not fall remarkably, it can be used also as a main structure of a building.

In addition, since the distances L1 and L2 become distances corresponding to 5 to 20% of the total length of the pillar material 3, the buckling of the inclined material and the early occurrence of breakage of the connecting portion are suppressed, and the yield strength of the entire frame is greatly increased. The fall can be prevented.

In the frame 101, since the reinforcing materials 102 and 103 are reinforced, when the distance of the inclined materials 6 to 9 is longer than the frame height (rectangular frame height) (the ratio of the width of the frame to the height is large). In this case, the buckling strength of the warp member can be improved. Therefore, the yield strength of the whole frame can be improved.

In addition, the connecting member 10 is screwed to the pillar materials 2 and 3 at the screw fastening position spaced inwardly by a predetermined space | interval from the pillar corner part of the pillar materials 2 and 3. Therefore, even when the force in the direction away from the pillar materials 2 and 3 acts on the inclined materials 6 to 9, energy is absorbed by the plastic deformation of the connecting member 10. Therefore, the yield strength of the whole frame is improved.

As mentioned above, although preferred embodiment of this invention was described, this invention is not limited to the above-mentioned embodiment, A various design change is possible as long as it described in a claim. For example, in the above-mentioned embodiment, although the frames 1 and 101 have four inclined materials 6-9, you may change the number of inclined materials. In addition, distance L1 and L2 can be changed.

Claims (5)

A first frame member connecting the first pillar member, the second pillar member, one end of each of the first pillar member and the second pillar member, and the other end of each of the first pillar member and the second pillar member. In the proof frame having a second frame member connecting the The first inclined member which connects the position other than the both ends of a said 1st pillar material, the position other than the both ends of a said 2nd pillar material, and connects the position of one end side of a said 2nd pillar material rather than the said connection position, and the said 1st pillar material of A second inclined member that connects a position other than both ends and a position other than both ends of the second pillar material and connects the position of the other end side of the second pillar material to the connection position is provided with respect to one or a plurality of connection positions. It is, The connection point of the said 1st inclined material and the said 2nd pillar material arrange | positioned at the one end side of the said 2nd pillar material is spaced apart from the connection point of the said 2nd pillar material and the said 1st frame material, and is the other end part of the said 2nd pillar material. The connection point between the first inclined member and the second pillar member disposed on the side is spaced apart from the connection point between the second pillar member and the second frame member. The method according to claim 1, wherein the distance between the connection point of the first inclined member and the second pillar member disposed at the one end side of the second pillar member, the connection point of the second pillar member and the first frame member, and the first The distance between the connection point of the said 1st slope material and the said 2nd pillar material arrange | positioned at the other end side of 2 pillar materials, and the connection point of the said 2nd pillar material and the said 2nd frame material is 5 of the total length of the said 2nd pillar material. It is the distance corresponding to 20 to 20% of the proof frame. The reinforcement of Claim 1 or 2 which connects positions other than the both ends of a said 1st frame material, and positions other than the both ends of a said 2nd frame material, and is further bonded to the said 1st inclination material and a 2nd inclination material. The load bearing frame further comprises. The connecting member according to any one of claims 1 to 3, further comprising a connecting member disposed between the first and second pillar members and the first and second inclined members, The bearing member is fixed to the first and second pillar members at a fixed position spaced inward from the pillar corner portions of the first and second pillar members. The distance between the pillar corner parts of the said 1st and 2nd pillar material and the said fixed position is a distance corresponding to 20 to 30% of the side width of the said 1st and 2nd pillar material, The bearing capacity of Claim 4 characterized by the above-mentioned. frame.

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