JP2006291613A - High strength bolt friction joining structure of square steel-pipe column and attached plate for one surface friction - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stably secure joining strength by abutting a doubling plate only on the inner side of an square steel-pipe column and reducing a protruded part of the doubling plate and a nut through head-clamping of a high strength bolt at the outer side of the square steel-pipe column and by using an attached plate for one surface friction advantageously securing sufficient yield strength to compressive force as the doubling plate when forming a continuous square steel-pipe column by joining the square steel-pipe columns in a length direction using the doubling plates and the high strength bolts. <P>SOLUTION: The doubling plate for one surface friction having reinforcing parts at the back surface side abuts only on the inner surface side of a joining area of the square steel-pipe columns and a screw part is protruded from the doubling plate by inserting the high strength bolt from the outer surface side of the square steel-pipe column and the nut is threaded to the screw part and fastened in a high strength bolt friction joining structure of the square steel-pipe column. The doubling plate for one surface friction used in the joining structure has a plurality of bolt holes corresponding to bolt holes of the square steel-pipe column and the reinforcing parts formed across the joined square steel-pipe columns and arranged continuously in a material axis direction in the vicinity of the joining area at the back surface side. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is applied to, for example, a case where a long rectangular steel pipe column is formed by joining a square steel pipe used as a column material in the material axis direction using an attachment plate and a high-strength bolt when constructing a steel frame. The present invention relates to a high-strength bolt friction joining structure of a square steel pipe column and a one-side friction accessory.

In general, pillars to construct steel frames are usually carried in the site with a length of 12m or less, which corresponds to the height of about the third floor of the building, due to road transportation restrictions, and high-rise buildings are constructed. In the case of doing so, it has been practiced to lengthen by joining the pillars in the field. In this case, for example, when a H-shaped cross-section material (open cross-section material) is used as a column material, it can be easily joined using an accessory plate and a general high-strength bolt, but a square steel pipe (closed cross-section material) is a column. In the case of using a material, since it is difficult to join using a ply plate and a general high-strength bolt as described above, conventionally, welding that can be directly joined by joining work from the outside has been used.
Thus, when welding a square steel pipe column by welding, it is not uncommon for two welders to take half a day for one welded joint, and a great deal of labor is required for quality control and inspection of the weld. In addition, since welding may be affected by the weather (limited to rain, wind, low temperature, etc.), it is necessary to take measures against wind, rain, low temperature, etc. There is a problem of inviting soaring.

In order to solve such a problem, there has been proposed a column-column joint structure in which a accessory plate is brought into contact with the outside or outside and inside of a square steel tube column and fastened with bolts and nuts. For example, straddling the upper and lower square steel pipes, the outer plate and the inner plate are abutted, high-strength bolts are inserted from the opening of the square steel pipe end, the outer auxiliary plate from the bolt hole of the inner auxiliary plate There has been proposed a joint structure that protrudes to the outside and is fastened by screwing a nut.
In this joint structure, a general high-strength bolt can be used. However, it is necessary to insert high-strength bolts into a large number of bolt holes by groping, and the labor load is large. In addition, when the accessory plate is in contact with the outside of the square steel pipe column, a local bulging portion is generated by the accessory plate on the outer surface of the square steel tube column, and the square steel pipe column finish treatment (fireproof material coating, panel tension, etc.) In addition, when a bolt is inserted from the inside of a column steel pipe and tightened by tightening a nut on the outside, the height of the protruding portion due to the use of the nut increases, and the degree of this trouble is further increased. There is a problem of becoming.

For example, in Patent Document 1, as shown in FIGS. 11 (a) and 11 (b), as a joint structure of a rectangular steel pipe column that solves such a problem, a plurality of nuts 5 are rotated together on the back side. In order to prevent this, the accessory plate 2 held by the holder 4 is brought into contact only with the inner side of the square steel pipe column 1, and the torcia head-clamping high-strength bolt 3 using the washer 6 is bolted from the outside of the square steel pipe column 1 to the bolt holes 1o, 2o A joining structure of square steel pipe columns is disclosed which is inserted into the nut 2 and screwed into a nut 4 held on the back side of the accessory plate 2 and fastened by tightening a high-strength bolt 3 by head clamping. .
However, although the accessory plate 2 used here is a flat plate and uses a slightly increased thickness, it is in contact with only the inner side of the square steel pipe column 1 and joined with a high-strength bolt 3 by one-surface friction welding. In this case, as shown in FIG. 12 (a), an eccentricity e occurs in the steel pipe column 1 and the accessory plate 2. Therefore, in some cases, due to the compressive force N acting in the axial direction of the rectangular steel pipe column 1, FIG. As shown in (b), out-of-plane deformation c occurs in the central part of the accessory plate 2 near the joining position of the steel pipe column 1 and the square steel pipe parts above and below the accessory plate, so that sufficient proof strength is exhibited as the joint part. Sometimes it is not possible.
As an example of countermeasures, it is possible to increase the proof stress by simply increasing the thickness of the accessory plate, but in this case, the material cost and processing cost of the accessory plate will increase more than necessary, and the weight will increase. For this reason, there is a problem that the construction load due to manual work increases, which is difficult to say.
Japanese Patent Laid-Open No. 2004-300737

  In the present invention, when a square steel pipe column is formed by joining a square steel pipe column in the length direction using an accessory plate and a high-strength bolt, the accessory plate is brought into contact with the inner side of the square steel tube column only to make a one-surface friction welding. When tightening high-strength bolts on the outside of the square steel pipe column to reduce the protruding parts due to the plate and nut, alleviation of obstacles to the column finishing process (fireproof material coating, panel tension, etc.) The present invention provides a high-strength bolt friction joint structure for a rectangular steel pipe column that can secure a stable joint strength by using a single-surface friction accessory plate that can advantageously ensure a sufficient yield strength against a compressive force.

The present invention is summarized as the following (1) to (9) in order to advantageously solve the above problems.
(1) In a high-strength bolt friction joint structure of a square steel pipe column using a splice plate and a high-strength bolt, a one-surface friction splice plate having a reinforcing portion that extends across the square steel pipe column to be joined and continues in the axial direction is square. It is only in contact with the inner surface side of the joint area of the steel pipe column, and a high-strength bolt is inserted from the outer surface side of the square steel pipe column so that the screw part protrudes from the back surface of the accessory plate, and the nut is screwed and fastened. High-strength bolt friction joint structure for square steel pipe columns.
(2) In the high-strength bolt friction joint structure of the square steel pipe column of (1), a single-surface frictional attachment plate used in contact with the inner surface side of the square steel pipe column, a plurality of bolts matched to the bolt holes of the square steel pipe column For high-strength bolt friction joining of square steel pipe columns, which has a hole and has a reinforcing portion that extends in the material axis direction across the square steel pipe columns to be joined, at least in the vicinity of the joining portion on the back side One side friction plate.
(3) The one-surface friction accessory plate for high-strength bolt friction joining of a square steel pipe column in which the reinforcing portion of the accessory plate is composed of a plurality of vertical ribs joined to the accessory plate in (2).
(4) A single-surface friction accessory plate for high-strength bolt friction joining of a rectangular steel pipe column, wherein the reinforcing portion of the accessory plate is formed by bending both ends of the accessory plate itself in (2).
(5) The one-surface friction accessory plate for high-strength bolt friction joining of a rectangular steel pipe column, wherein the reinforcing portion of the accessory plate is a plurality of protrusions formed integrally with the accessory plate in (2).

(6) In (2), a square steel pipe column comprising a web and both flanges, the web having bolt holes that match the bolt holes of the square steel pipe column, and a plurality of grooved steel members having both flange portions as reinforcing portions. One-surface friction accessory plate for high-strength bolt friction bonding.
(7) In (2), a square formed by arranging a plurality of grooved steel members composed of a web having a bolt hole matching the bolt hole of the accessory plate and both flanges on the back surface of the accessory plate on the web side. One-surface friction accessory plate for high-strength bolt friction welding of steel pipe columns.
(8) In any one of (2) to (7), a holding frame for holding the nut so as not to rotate together with the bolt hole is mounted on the nut screwing side of the accessory plate on which the reinforcing portion is formed. One-side friction accessory plate for high-strength bolt friction welding of square steel pipe columns.
(9) In (2), a grooved steel material comprising a web and both flanges and holding a plurality of nuts in the groove space so as not to rotate together with the bolt holes of the accessory plate is provided on the rear surface of the accessory plate. For single-surface friction for high-strength bolt friction joining of square steel pipe columns, which are formed by arranging nuts at positions where they can be screwed into high-strength bolts inserted from the outer surface side of the square steel pipe columns via bolt holes and joining at both flange ends. Saddle plate.

In the present invention, when a square steel pipe column is formed by joining a square steel pipe column in the length direction using a spigot plate and a high-strength bolt, the one-surface friction accessory plate having a reinforcing portion is placed inside the square steel pipe column. Since only one-side frictional joining is used, high-strength bolts are tightened on the outside of the square steel pipe column to reduce the protruding portion by the accessory plate and nut, and the column finish processing (fireproof material coating, panel tension, etc.) The height of a rectangular steel pipe column that can sufficiently secure the strength against compressive force in the axial direction of the joints and can ensure stable joint strength without alleviating the obstacles and without significantly increasing the cost of plate and manual work. A force bolt friction joint structure can be obtained stably.
In addition, when the nut holder is held so that it does not co-rotate on the side of the friction plate, the high-strength bolt can be easily screwed to the nut from the outer surface side of the square steel pipe column and fastened, reducing the joint work load can do.

[Example of bonding structure]
The present invention is applied when a rectangular steel pipe is used as a column material and the upper and lower rectangular steel pipe columns to be joined are joined in the length direction to form a long rectangular steel pipe column mainly at a construction site. It is a high strength bolt friction joint structure of a square steel pipe column using a plate, and here, FIG. The outline will be explained based on the above.
The basic structure of the high-strength bolt friction joint structure of the square steel pipe column of the present invention is a plurality of bolt holes corresponding to the bolt holes 1o of the square steel pipe columns 1a and 1b to be joined as shown in FIGS. 1 (a) and 1 (b). 2o, and has a reinforcing portion 8 that extends in the material axis direction across the square steel pipe columns 1a and 1b to be joined at least in the vicinity of the joining portion on the back side, for example, for one-surface friction as shown in FIG. An accessory plate (hereinafter referred to as “attachment plate” or “single-surface friction accessory plate”) 2 is brought into contact with a position where the bolt holes 1o and 2o meet in the joint region inside the four side surfaces of the square steel pipe columns 1a and 1b, By inserting high-strength bolts 3 into the bolt holes 1o and 2o from the outer surface sides of the square steel pipe columns 1a and 1b, projecting the threaded portions from the back surface of the accessory plate 2, and screwing and fastening the nuts 5, the square steel pipe columns 1a, High-strength bolt friction welded structure of square steel pipe columns joined with 1b It is.

Here, a plurality of nuts 5 and washers 7 for each column are held on the back side of the accessory plate 2 via a nut holder 4, and high strength bolts 3 are connected to bolt holes 1o from the outside of the square steel pipe columns 1a and 1b. It is inserted into 2o and tightened, and screwed and fastened to the nut 5 held by the nut holder 4. The position of the nut 5 held by the nut holder 4 can be changed within a certain minute range, and the high-strength bolt 3 can be smoothly screwed in response to the minute displacement.
The high-strength bolt 3 is, for example, a torcia-type head-clamping high-strength bolt as described in Patent Document 1, and uses a dedicated fastener that uses the same principle as a conventional fastener, together with a washer 6. Those that can be tightened using head tightening while controlling the tightening torque are highly suitable.

[Example of construction procedure for joint structure]
In the above-mentioned example of the joining structure, the accessory plate 2 holding the nut 5 and the washer 7 by the nut holder 4 is brought into contact with the square steel pipe columns 1a and 1b, and the high strength bolt 3 is attached to the head from the outside of the square steel tube columns 1a and 1b. When the square steel pipe columns 1a and 1b are joined by tightening and screwing and fastening to the nut 5, for example, a construction procedure example as shown in FIG. 4 can be employed.
(1) A plurality of bolt holes 1o are formed in the ends of the square steel pipe columns 1a and 1b cut to a predetermined length and trimmed.
(2) A plurality of bolt holes 2o corresponding to the bolt holes 1o when the square steel pipe columns 1a and 1b are abutted with each other are provided in the accessory plate body 2h cut and processed to a predetermined size, and the back surface is fitted to each bolt hole 2o. On the side, the nut 5 is held via the nut holder 4 so as not to rotate together with the high-strength bolt 3 at the time of fastening. Further, at least in the vicinity of the joining portion on the back side of the accessory plate main body 2h, the reinforcing portions 8 formed of vertical ribs extending in the direction of the material axis across the square steel pipe columns 1a and 1b to be joined are provided on both sides of the nut holder 4. Welding w joining.
(3) A state in which the accessory plate 2 is inserted from the opening end into the two opposite side surfaces (for example, side surfaces A and B) of one rectangular steel pipe column 1b so that the contact portion with the rectangular steel tube column 1a protrudes to the outside. The high-strength bolt 3 is inserted into the bolt holes 1o and 2o selected within the reach of the square steel pipe column 1b from the outside of the square steel pipe column 1b (all are acceptable), and the nut holder 4 is inserted on the back side of the accessory plate 2 The nut 5 is screwed and temporarily tightened.
(4) In the other square steel pipe column 1a, the contact plate 2 is inserted into the opposite two side surfaces (for example, the side surfaces C and D ·· D are not shown) from the opening end so that the contact portion with the square steel tube column 1b is provided. Insert the high-strength bolts 3 into the selected bolt holes 1o, 2o within the reach of the internal hands from the outside of the square steel pipe column 1a. 2 is screwed into the nut 5 held by the nut holder 4 on the back side and temporarily tightened.
(5) The square steel tube column 1a is brought close to the square steel tube column 1b, and the contact portion of the accessory plate 2 on the square steel tube column 1a side protruding from the open end is inserted into the square steel tube column 1b and simultaneously protrudes from the open end. The abutting part of the accessory plate 2 on the side of the steel pipe column 1b is inserted into the square steel tube column 1a, and the positions of the bolt holes 1o and the groove holes 2o of the respective accessory plates 2 are adjusted to the outside of the square steel tube columns 1a and 1b. The high-strength bolts 3 are inserted into the bolt holes 1o and 2o and tightened to the head, and screwed and fastened to the nut 5 held on the nut holder 4 on the back side of the accessory plate 2, together with (3) and (4) The high-strength bolt 3 and the nut 5 that have been temporarily tightened in step 1 are finally tightened.
In this way, the high-strength bolt friction joint structure for the square steel pipe column can be obtained by joining the accessory plate 2 with the high-strength bolts 3 to the side surfaces (A to D) of the square steel pipe columns 1a and 1b. it can.

  In addition, the square steel pipe which joins, after carrying out the temporary fastening of the accessory plate 2 to a square steel pipe column by half (2 side surfaces) by one square steel pipe column 1b and the other square steel pipe column 1a side by said construction procedure. Although it is inserted and fastened to the column side, this is to shorten the distance from the open end of the square steel pipe column to the temporary fastening region and to improve the workability of the temporary fastening from the open end. In such a case, all (four side surfaces) of the accessory plates 2 may be temporarily fastened with either one of the square steel pipe columns, and inserted into the square steel pipe pillar side to be joined. . (The above corresponds to the embodiment of claim 1).

[Applied plate example 1]
More specifically, as shown in FIG. 2, the one-surface friction accessory plate 2 used in [Example of structure of joining structure] joins square steel pipe columns 1a and 1b to be joined to the back surface of a flat accessory plate body 2h. A plurality of vertical ribs extending in the axial direction straddling the rectangular steel pipe columns 1a and 1b in a region near the portion with a substantially uniform length are welded at intervals to form the reinforcing portion 8. Here, the longitudinal rib forming the reinforcing portion 8 has a length shorter than the length of the material axis of the accessory plate 2, and the welding w is a local welding by selecting a plurality of locations. (It is not essential to weld the entire circumference).
The reinforcing portion 8 is formed between columns of a plurality of bolt holes 2o that match the bolt holes 1o of the square steel pipe columns 1a and 1b. In this one-surface friction accessory plate 2, the reinforcing portion 8 is formed only in the vicinity of the joint portion of the square steel pipe columns 1 a and 1 b that need the most reinforcement, so that it can be obtained easily and inexpensively. The length can be increased to the length of the material axis of the accessory plate 2.

  A nut holder 4 used for holding the nut 5 and the washer 7 is fixed to the back surface of the accessory plate 2 by, for example, spot welding w. The nut holder 4 is more specifically shown in FIG. ), As shown in (b), it is formed of a molded frame made of an ultrathin steel plate welded to the accessory plate 2 at a plurality of points, and the top plate 4c has a protruding space 4d at the tip of the high strength bolt 3, The nut 5 is held together with the washer 7 at the position of the bolt hole 2o of the accessory plate 2 and is elastically held between the side plate 4a and the stop plate 4b. The nut 5 and the washer 7 held by the nut holder 4 are finely The position can be adjusted within the range. The nut holder 4 is mainly one that can hold the nut 5 and the washer 7 in units of a plurality of bolts 2o, but may be one that can hold the nut 5 and the washer 7 in units of bolt holes 2o.

Further, it is not essential to provide the nut holder 4 for every bolt hole 2o of the accessory plate 2. For example, since the high-strength bolt 3 and the nut 5 can be temporarily fastened manually from the open end of the square steel pipe column on the side that is temporarily fastened to the square steel pipe column, the nut holder is placed in the bolt hole 2o in this region. 4 may not be provided.
The shape of the nut holder is selected according to the number and arrangement of the nuts, but the basic shape is rectangular, for example, each row of a plurality of nuts 5 on the four surfaces of a square steel pipe column, for example, a vertical row (a horizontal row arrangement, an arrangement of nut units) Can also be selected). As a method of fixing the nut holder 4 to the accessory plate 2, a method of fixing at least two places by welding w at a factory is simple. (Corresponding to the embodiments of claims 2, 3 + 8).

[Example 2 of accessory plate]
As another example of the one-surface friction accessory plate used in the present invention, as shown in FIG. 5, both ends of the accessory plate 9 are bent to form both flanges 9f as reinforcing portions, and between the flanges 9f, a square steel pipe column 1a. Some have a plurality of bolt holes 9o that match the bolt holes 1o of 1b. Since the one-surface friction accessory plate 9 can be easily obtained by simple bending at both ends, it can be obtained at a low cost.
However, if the gap between the flanges 9a at both ends is large, the stable reinforcing effect may not be sufficient. Therefore, a small width plate 9 with a small gap between the flanges at both ends may be used. Consider. In this case, the plurality of accessory plates 9 may be made independent, but the reinforcing effect can be secured more stably by using the plurality of accessory plates 9 joined in the width direction.
For example, a nut holder 4 as shown in FIG. 3 holding the nut 5 and the washer 7 is fixed to the back side of the accessory plate 9, but detailed description thereof is omitted. (Corresponding to the embodiments of claims 2, 4 + 8).

[Example 3 of accessory plate]
As another one-surface friction accessory used in the present invention, as shown in FIG. 6, the reinforcing portion of the accessory plate 10 is composed of a plurality of protrusions 10a formed integrally with the accessory plate itself. Some have a plurality of bolt holes 10o that match the bolt holes 1o of the steel pipe columns 1a and 1b.
The one-surface friction accessory plate 10 can be obtained easily and inexpensively by cutting a molded body obtained by, for example, rolling, and has a nut 5 and a washer 7 held on the back side. For example, as shown in FIG. Such a nut holder 4 is fixed, but detailed description is omitted. (Corresponding to the embodiments of claims 2, 5 + 8).

[Fourth plate example 4]
As shown in FIG. 7, another one-surface friction accessory used in the present invention comprises a web 12u and both flanges 12f, and the web 12u has a bolt hole 12o that matches the bolt hole 1o of a square steel pipe column. There are some made of a plurality of grooved steel members 12 having both flanges 12f as reinforcing portions. Basically, a plurality of the steel sheets are used in the width direction, but it is desirable to join adjacent channel steel materials by, for example, welding w, in order to ensure stable joint strength.
This one-surface friction plate 11 can be obtained easily and inexpensively by cutting a C-shaped steel that is easily obtained, for example, by rolling, and holds a nut 5 and a washer 7 on the back side. Although the nut holder 4 as shown in FIG. 3 is fixed, detailed description is abbreviate | omitted. (Corresponding to the embodiments of claims 2 and 6 + claim 8).

[Example 5 of accessory plate]
As shown in FIG. 8, another one-surface friction accessory plate used in the present invention includes a web 14 u having bolt holes 14 o that match the bolt holes 13 o of the accessory plate 13 on the back surface of the main body 13 h of the accessory plate 13, and both. There is one in which a plurality of channel steel members 14 made of flanges 14f are arranged in the width direction as reinforcing portions.
The splicing plate 13 and the channel steel 14 are joined to the square steel pipe column with the high-strength bolts 3. Therefore, joining is not indispensable, but it is desirable to join the reinforcing plate 13 in order to secure the reinforcing effect more stably. It is not indispensable to join the adjacent grooved steel members 14, but it is desirable to join them in order to secure the reinforcing effect more stably. For example, the nut holder 4 as shown in FIG. 3 holding the nut 5 and the washer 7 on the back side of the channel steel material 14 is fixed, but detailed description is omitted.
Here, the adjacent channel steel materials 14 are arranged side by side in the width direction, but it is also possible to consider arranging them with a reduced size (particularly the width of the web 14u). (Corresponding to the embodiments of claims 2 and 7 + claim 8).

[Example 6 of accessory plate]
As another one-surface friction accessory used in the present invention, as shown in FIG. 9, a nut that holds a plurality of nuts 5 so as not to rotate together with bolt holes 15 o on the back surface of a main body 15 a of the accessory plate 15. The holder 4 is welded w, and a plurality of channel steel members 16 composed of a web 16u and both flanges 16f are used as reinforcing portions, arranged in the width direction so as to accommodate each nut holder 4 in the groove space 16x, and both flanges 16f end side And the nut 5 held by the nut holder 4 can be screwed onto the high-strength bolt 3 inserted from the outer surface side of the rectangular steel pipe column via the bolt hole 15o of the accessory plate 15.
The nut holder 4 for holding the nut 5 and the washer 7 is basically the same as that shown in FIGS. 3A and 3B, and more specifically as shown in FIGS. 9B and 9C. In addition, the nut 5 and the washer 7 are inserted into the nut holder 4 and the position is held by the back surface of the accessory plate body 15a, the top plate 4c, the side plate 4a and the stop plate 4b of the nut holder so that the position can be adjusted within a minute range. Is.
Here, the nut holder 4 is welded to the back surface of the accessory plate main body 15a, but may be joined (welded, engaged, etc.) to the grooved steel material 16 side. Note that the channel steel material 16 may not be disposed so as to accommodate the nut holder 4 but may be disposed independently as a reinforcing portion.
Here, although the channel steel material 16 is disposed so as to accommodate the nut holder 4, it can be considered to be displaced from the nut holder 4 (bolt hole). (Corresponding to embodiments of claims 2 and 9).

In order to evaluate the effectiveness of the present invention, when a gradually increasing compressive load is applied in the direction of the material axis for a square steel pipe column member having a joint portion using a one-surface friction accessory plate on the inner surface side of the central portion of the four surfaces. The relationship between the material axial compression force N (kN) and the material axial deformation (δ mm) was investigated by elasto-plastic FEM analysis. This analysis was performed for the following three cases, and the joint strength was evaluated for each case based on the analysis results.
[Case 1]: Comparative Example 1 (conventional basic example in which the reinforcing plate is not provided with a reinforcing plate)
Total length of member: 2000mm
Square steel pipe column Thickness: 12mm
Outer diameter: 600mm
Yield point 325 MPa
One side friction accessory Thickness: 12mm
Width: 440mm
Material shaft length: 460mm
Yield point: 325 MPa
Reinforcement part: None High-strength bolt Attached to one accessory plate, it is equivalent to three rows (12 bolts total) arranged in a vertical arrangement of four.
Note that the high strength bolt itself is not modeled on the assumption that a sufficiently large slip strength is secured. In the FEM analysis, the plate and the square steel pipe column are rigidly connected at the position where the high strength bolt is placed. did.
[Case 2]: Example of the present invention (using the accessory plate of claim 3 having a reinforcing portion by vertical ribs)
Total length of member: 2000mm
Square steel pipe column: Same as case 1 One-side friction accessory Thickness: 12 mm
Width: 440mm
Material shaft length: 460mm
Yield point: 325 MPa
Reinforcement part: Existence (Installed 2 sheets per sheet with vertical ribs)
Vertical rib
Thickness: 17.6mm
Height: 50mm
Material shaft length: 460mm
High-strength bolts: Same as Case 1 [Case 3]: Comparative Example 2 (Case 1 with the same cross-sectional area as the vertical rib cross-sectional area of Case 2 with a uniform increase in the thickness of the one-surface friction accessory plate)
Total length of member: 2000mm
Square steel pipe column: Same as case 1 One-side friction accessory Thickness: 16 mm
Width: 440mm
Material shaft length: 460mm
Yield point: 325 MPa
Reinforcement part: None High-strength bolt: Same as Case 1.

The analysis results for the above cases are shown in FIG. In either case, the joint yielded and the stiffness decreased as the out-of-plane deformation progressed.
FIG. 10 shows the relationship between the material axial compression force N (kN) and the material axial deformation (δ mm) as a result of analysis, and also shows the results of evaluating the joint strength of each case. . The joint strength here is defined as the point at which the tangential stiffness has decreased to 1/3 of the initial stiffness (yield strength of the joint), and as a result of comparing the joint strength of each case, In this case, the joint strength was 1.34 times that of Comparative Example 1 of Case 1. On the other hand, in Comparative Example 2 of Case 3, a slight increase in joint strength was observed, which was 1.07 times that of Comparative Example 1, but no significant improvement as in the inventive example was observed.

The present invention is not limited to the contents of the above-described embodiments and examples. For example, the arrangement of the accessory plate, the shape and size (including length) of the reinforcement part of the accessory plate, the formation area, the presence or absence of the bolt hole, the arrangement of the bolt hole, the structure of the nut holder, various joining means, high strength bolts, construction procedure Etc., there is a change within the scope of the above claims according to the use of the rectangular steel pipe column, the required joint strength, and the like.
In addition, a treatment for strengthening the frictional force on the joint surface between the square steel pipe column and the accessory plate, a high friction steel plate, interposition of a filler, and the like can be considered. Furthermore, when a torcia type head tightening high strength bolt is used as the high strength bolt, it is also possible to consider applying an antioxidant to the screw portion and the screw portion of the nut so as not to reduce the tightening torque management accuracy.

(A) A figure is a horizontal cross-section explanatory drawing which shows the example of the form of the high strength bolt friction joining structure of the square steel pipe column by this invention, (b) A figure is Aa-Ab arrow partial cross-section explanatory drawing of (a) figure. FIG. 3 is a three-dimensional explanatory view showing a first example of the one-surface friction accessory plate used in FIG. 1. (A) The figure is a plane partial explanatory view showing an example of the structure of the nut holder provided on the back side of the accessory plate in the present invention, (b) The figure is a cross-sectional explanatory view taken along the arrow line Ba-Bb in (a). The figure is an explanatory view taken along the line Ca-Cb in the figure (b). Side cross-section part explanatory drawing for demonstrating the example of a construction procedure in the form example of the high strength bolt friction joining structure of the square steel pipe column of FIG. The solid explanatory drawing which shows the example 2 of the one-surface friction accessory plate used with the high strength bolt friction joining structure of the square steel pipe pillar of this invention. The solid explanatory drawing which shows the example 3 of the one-side friction accessory plate used with the high strength bolt friction joining structure of the square steel pipe pillar of this invention. The solid explanatory drawing which shows the form example 4 of the one-surface friction accessory plate used with the high strength bolt friction joining structure of the square steel pipe pillar of this invention. The solid explanatory drawing which shows the example 5 of the one-side friction accessory plate used with the high strength bolt friction joining structure of the square steel pipe pillar of this invention. (A) The figure is a three-dimensional explanatory view showing an embodiment 6 of the one-surface friction accessory plate used in the high-strength bolt friction joining structure of the square steel pipe column of the present invention, and (b) is an upper surface partial description of (a). The figure and (c) figure are Da-Db arrow directional cross-section explanatory drawings of the figure (b). Explanatory drawing of the relationship between the material axial direction compression force and material axial direction deformation | transformation for evaluating the junction strength in the Example and comparative example of the square steel pipe column member by this invention. (A) A figure is a horizontal cross-section explanatory drawing which shows the example of the high strength bolt friction joining structure of the conventional square steel pipe column, (b) A figure is Ea-Eb arrow partial cross-section explanatory drawing of (a) figure. (A) The figure is a side surface explanatory view showing an example of compressive force transmission at the joint of a square steel pipe column using a single-surface friction accessory plate and a high-strength bolt. (B) The figure is a conventional square steel pipe column and one-surface friction. Side surface explanatory drawing which shows the example of an out-of-plane deformation | transformation by the compressive force in the high strength bolt junction part of the accessory plate.

Explanation of symbols

1, 1a, 1b Steel pipe pillar 1o Bolt hole 2 Fitting plate for one surface friction 2h Plating plate body 2o Bolt hole 3 High strength bolt 4 Nut holder 4a Side plate 4b Stop plate 4c Top plate 4d Tip space 5 Nut 6 Washer (Bolt head side 7 Washer (Nut side)
DESCRIPTION OF SYMBOLS 8 Reinforcement part 9 One-surface friction accessory plate 9f Flange 9o Bolt hole 10 One-surface friction accessory plate 10a Projection part 10o Bolt hole 11 One-surface friction accessory plate 12 Channel steel 12u Web 12f Flange 12o Bolt hole 13 One-surface friction accessory plate 13h Plating plate body 14 Channel steel 14u Web 14f Flange 14o Bolt hole 15 Friction plate 15a Fitting plate 15a Plating plate 15o Bolt hole 16 Channel steel 16f Flange 16x Groove space 16u Web

Claims (9)

  In a high-strength bolt friction joint structure for square steel pipe columns using a splice plate and high-strength bolts, a single-surface friction splice plate having a reinforcing portion that extends continuously in the axial direction across the steel pipe columns to be joined is joined to the square steel pipe columns. Of the square steel pipe column, which is in contact with only the inner surface side of the section region, a high-strength bolt is inserted from the outer surface side of the square steel pipe column, the screw part is projected from the back surface of the accessory plate, and the nut is screwed and fastened. High strength bolt friction joint structure.   The high-strength bolt friction joint structure for a square steel pipe column according to claim 1 is a one-surface friction accessory plate used in contact with the inner surface side of the square steel pipe column, and has a plurality of bolt holes that match the bolt holes of the square steel pipe column. And a single-surface friction for high-strength bolt friction joining of a square steel pipe column, characterized by having a reinforcing portion that extends in the material axis direction across the square steel pipe column to be joined, at least in the vicinity of the joint portion on the back side Supplementary plate.   The single-surface friction accessory plate for high-strength bolt friction welding of a square steel pipe column according to claim 2, wherein the reinforcing portion of the accessory plate comprises a plurality of vertical ribs joined to the accessory plate.   The one-surface friction accessory plate for high-strength bolt friction joining of a rectangular steel pipe column according to claim 2, wherein the reinforcing portion of the accessory plate comprises a ridge portion formed by bending both ends of the accessory plate itself.   The one-surface friction accessory plate for high-strength bolt friction joining of rectangular steel pipe columns according to claim 2, wherein the reinforcing portion of the accessory plate comprises a plurality of protrusions integrally formed on the accessory plate itself.   The height of the rectangular steel pipe column according to claim 2, comprising a plurality of grooved steel members each comprising a web and both flanges, the web having bolt holes that match the bolt holes of the square steel pipe columns, and having both flange portions as reinforcing portions. One side friction plate for force bolt friction welding.   The square steel pipe column according to claim 2, wherein a plurality of grooved steel members composed of a web having a bolt hole matching the bolt hole of the accessory plate and both flanges are arranged in the width direction and joined on the back side of the accessory plate on the web side. One-surface friction accessory plate for high-strength bolt friction bonding.   The square steel pipe according to any one of claims 2 to 7, wherein a holding frame for holding the nut so as not to rotate together with the bolt hole is attached to the nut screwing side of the accessory plate on which the reinforcing portion is formed. Single-surface friction plate for high-strength bolt friction welding of columns.   On the back side of the splicing plate, a grooved steel material consisting of a web and both flanges and held in the groove space so that a plurality of nuts do not rotate together with the bolt holes of the splicing plate is connected to the outer surface of the steel pipe column via the bolt holes of the splicing plate The one-surface friction accessory plate for high-strength bolt friction joining of a square steel pipe column according to claim 2, wherein nuts are arranged on a high-strength bolt inserted from the side at positions where screws can be screwed together and joined at both flange end sides.

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