JP6685571B1 - Beam-column joint structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joining structure capable of reducing the number of welded portions of a steel frame member as much as possible and preventing an increase in cost. SOLUTION: A beam 3 composed of an H-shaped steel and a joining member 4 provided at an end portion of the H-shaped steel is arranged with the end portion placed on a jaw 2a provided on a side surface of a concrete pillar 2. Then, the PC tension member 6 is disposed so as to penetrate the column 2 and the joining member 4, and the PC tension member 6 is tensioned and fixed to the surface of the joining member 4 on the side opposite to the column 2, whereby the column 2 and the beam 3 are provided. In the column-beam joint structure 1 for integrally joining and, the joint member 4 is formed of square steel pipes 4a, 4b, and the hollow cross sections are continuous on both sides of the H-shaped steel web 3b in the beam girder direction. It shall be provided in contact with the upper and lower flanges 3a, 3c of H-section steel. [Selection diagram]

Description

  The present invention relates to a joint structure between a concrete column and a steel frame beam (steel beam).

  Regarding the joint structure of this type of concrete column and steel beam, the concrete is made of concrete, taking advantage of the advantage that concrete is strong against compressive force and the advantage that steel frame is lighter, stronger and stronger than reinforced concrete, There is a conventional technology of a joint structure and a joint method of a column and a beam in a building having a mixed structure in which a beam is a steel structure.

  In Patent Document 1 below, the end of a steel beam having a fixing plate provided at the end is placed on a jaw provided in a precast / prestressed concrete column (hereinafter referred to as a PC column), and the upper and lower PC columns and the steel beam are attached. There is disclosed a joining structure and a joining method for integrally crimping and joining a PC steel material.

Japanese Patent No. 5521105

  In the technique disclosed in Patent Document 1, a fixing plate is provided at the end of the steel beam for joining the PC column and the steel beam. This fixing plate must be joined to the upper and lower flanges of the H-section steel by a welding method capable of bearing a tensile force such as full penetration welding in order to cope with a large bending stress generated at the beam end.

  However, full penetration welding requires a high level of technology and increases processing costs. Further, in order to suppress the thermal deformation of the fixing plate due to the complete penetration welding, it is necessary to make the fixing plate thick, which causes a problem that the cost is significantly increased.

  Further, in Patent Document 1, for the purpose of improving bending rigidity and the like, it is proposed to provide an end plate at the beam end and weld the fixing plate with a gap from the end plate. Since the welded fixing plate is prone to plastic deformation, it is necessary to provide a stiffening material between the end plate and the fixing plate so that it can withstand the tension caused by the PC steel material. There is also the problem of increase.

  Therefore, an object of the present invention is to provide a beam-column joint structure capable of reducing the number of welded portions of a steel frame member as much as possible and preventing an increase in cost.

The first aspect of the present application for solving the above-mentioned problems is
A beam composed of an H-section steel and a joining member provided at an end of the H-section steel is placed with the end placed on a jaw provided on a side surface of a concrete column,
A PC tension member is disposed so as to penetrate the column and the joining member, and the PC tension member is tensioned and fixed to the surface of the joining member on the side opposite to the column, whereby the column and the beam are integrated. A column-beam joint structure for chemical bonding,
The joining member is formed of a square steel pipe, and is provided on both sides of the web of the H-section steel in contact with the upper and lower flanges of the H-section steel, with hollow cross-sections being continuous in the beam direction. It is a beam-column joint structure.

The second aspect of the present application is
The end portion has an upper portion projecting toward the pillar side more than a lower portion,
The joining member is formed of an upper member and a lower member,
The upper member is placed on the jaw so as to protrude toward the pillar more than the lower member,
The column-beam joint structure according to the first aspect is characterized in that the lower member is arranged at substantially the same height as the jaw.

The third aspect of the present application is
The beam-column joining structure according to the first or second aspect is characterized in that the joining member has a filling material filled therein.

  According to the present invention, ready-made products can be used for both the beam main body and the beam end joint members, and a large bending stress is prevented from occurring at the welded portion in the beam-column joint, and a cross-sectional shape with a large bending rigidity is formed. It is possible to provide a column-beam joint structure that can prevent an increase in cost by using the square steel pipes that are provided and reducing the welded portions of the steel frame member as much as possible.

FIG. 1A is a diagram showing a plane and a cross section cut in a horizontal direction of a beam-column joint structure according to the first embodiment of the present application. FIG. 1B is a cross-sectional view showing a cross section obtained by cutting the beam-column joint structure according to the first embodiment of the present application in the vertical direction. FIG. 2A is a view showing a plane and a cross section cut in a horizontal direction of a beam-column joint structure according to the second embodiment of the present application. FIG. 2B is a cross-sectional view showing a cross section of the beam-column joint structure according to the second embodiment of the present application, taken in the vertical direction. FIG. 3A is a diagram showing a plane and a horizontal cross section of a beam-column joint structure according to a third embodiment of the present application. FIG. 3B is a cross-sectional view showing a cross section of the beam-column joint structure according to the third embodiment of the present application cut in the vertical direction. FIG. 4A is a diagram showing a plane and a cross section cut in a horizontal direction of a beam-column joint structure according to the fourth embodiment of the present application. FIG. 4B is a cross-sectional view showing a cross section of the beam-column joint structure according to the fourth embodiment of the present application, which is cut in the vertical direction.

(First embodiment)
The beam-column joint structure according to the first embodiment of the present application will be described with reference to FIG. 1. FIG. 1A is a diagram showing a plane and a horizontal cross section of a beam-column joint structure 1 according to the first embodiment of the present application. FIG. 1B is a cross-sectional view showing a cross section of the beam-column joint structure 1 according to the first embodiment of the present application, which is cut in the vertical direction. In the cross-sectional views of the present application, hatching of the cross-section such as the cross-section of the pillar 2 is partially omitted for clarity of the drawing.

  The column-beam joint structure 1 according to the first embodiment shown in FIG. 1A shows an example used for joining a concrete-made column 2 arranged as an outer column and three steel-framed beams 3 to each other. There is. The beam 3 is abutted against and joined to the side surface of the column 2 in a direction substantially perpendicular to the longitudinal direction of the column 2. In FIG. 1A, the beam 3 shown below the pillar 2 and its surroundings are shown in a plane, and the beams 3 shown on the left and right of the pillar 2 and their surroundings are shown as horizontal cross sections. The same beam-column joint structure 1 is used for joining the three beams 3 and columns 2. Therefore, in the drawings, the same reference numerals are used for corresponding parts. The column-beam joint structure 1 of the present application is not limited to the outer column, and can be applied to the middle column and the corner column.

  The pillar 2 is made of concrete, and can be made of, for example, a precast / prestressed concrete structure or a reinforced concrete structure. The pillar 2 has a jaw 2a which projects from the side surface and on which the end of the beam 3 is placed. The jaw 2a can be made of concrete integrally formed with the pillar 2. The jaw 2a has an upper surface that is substantially perpendicular to the substantially longitudinal direction of the pillar 2, three side surfaces that are substantially parallel to the longitudinal direction of the pillar 2, and a projecting dimension from the side surface of the pillar 2 becomes smaller as it goes downward. And a tapered lower surface. The lower surface of the jaw 2a has a tapered shape in order to facilitate demolding when the pillar 2 is manufactured. The shape of the jaw 2a is preferably the above-mentioned shape, but the shape is not limited to this and may be any shape as long as the end of the beam 3 can be placed thereon. For example, the lower surface may be a horizontal surface.

  The main part of the steel beam 3 is made of H-shaped steel, and has an upper flange 3a, a web 3b, and a lower flange 3c, respectively. At the end of the steel frame beam 3, a joining member 4 including a pair of rectangular steel pipes 4a and 4b is formed. Each of the pair of rectangular steel pipes 4a and 4b is attached to both sides of the web 3b in a direction in which the hollow cross section is continuous in the beam direction of the beam 3. In other words, the pair of rectangular steel pipes 4a and 4b are attached to both sides of the web 3b in a state where the column 2 and the beam 3 are joined, with the hollow cross section continuing in the substantially longitudinal direction of the column 2 or in the direction of gravity. ing.

  The rectangular steel pipes 4a and 4b have a height in contact with the upper flange 3a and the lower flange 3c. Although the square steel pipes 4a and 4b have a square cross section, the present invention is not limited to this, and a rectangular pipe can also be used. The rectangular steel pipes 4a and 4b are arranged such that the surface on the side of the column 2 is located on the same plane as the end surface of the steel beam 3 on the side of the column 2 and the joining member 4 and the beam 3 are integrated by only fillet welding. be able to. Further, by using the square steel pipes 4a and 4b which are ready-made products of JIS standard whose quality is guaranteed, it is not necessary to weld and integrate the hollow cross section of the joining member 4 by complete penetration welding or the like. As a result, it is possible to prevent an increase in manufacturing cost, and by avoiding the use of full-penetration welding, it is possible to reduce the risk of structural defects due to welding defects that cannot be visually confirmed.

  A joint is provided between the beam 3 and the pillar 2, and a joint mortar 5 is interposed. By providing the joints in this way, it is possible to prevent defects due to dimensional errors and to quickly build them.

  The beam 3 is tension-fixed to the column 2 by a PC tension member 6 arranged so as to penetrate the joining member 4 and the column 2, and fixing tools 7 arranged at both ends of the PC tension member 6. The fixing tool 7 can be composed of a pressure bearing plate and a nut. As the PC tension material 6, a PC steel material such as a PC steel rod can be used. The fixing tool 7 is in contact with the surface of the joining member 4 on the side opposite to the pillar 2 to fix the PC tension member 6 under tension. However, as shown in the upper side of FIG. 1A, in the case of an outer pillar or a corner pillar, the fixing tool 7 on the side where the beam 3 is not arranged is in contact with the side surface of the pillar 2 to fix the PC tension member 6 under tension. .

  According to the first embodiment described above, since welding corresponding to tensile force such as complete penetration welding and groove welding is not required, it is possible to prevent an increase in processing cost, and plate by welding Can be suppressed. Further, by forming the joining member 4 with the rectangular steel pipes 4a and 4b, the number of welding points for forming the joining member 4 can be significantly reduced. In addition, by installing the joining member 4 attached to the end of the steel beam 3 in a direction in which the hollow cross section is continuous in the substantially longitudinal direction (substantially the vertical direction) of the column 2, the attachment of the joining member 4 can be performed, for example, by shearing. A welding method such as fillet welding corresponding to stress can be adopted, and it can be manufactured at a lower cost as compared with the case of using welding corresponding to tensile force.

  Further, by arranging the joining member 4 formed by using the rectangular steel pipes 4a and 4b in a direction in which the hollow cross section is continuous in the substantially longitudinal direction (generally the vertical direction) of the column, it acts in the axial direction of the steel beam 3. Even if the PC tension member 6 receives the tension force, it has a closed cross section that is strong against buckling, so that it is not necessary to weld the stiffening member to prevent buckling. This makes it easy to omit the filler and reduces the labor and cost of construction. Further, since the beam 3 is supported by the jaws 2a of the pillar 2, it is possible to prevent the beam 3 from falling even during a huge earthquake.

(Second embodiment)
A second embodiment of the present application will be described with reference to FIGS. 2 (a) and 2 (b). FIG. 2A is a diagram showing a plane and a horizontal cross section of the beam-column joint structure 1 according to the second embodiment. FIG. 2B is a cross-sectional view showing a cross section of the beam-column joint structure 1 according to the second embodiment cut in the vertical direction. In FIG. 2A, the beam 3 shown below the pillar 2 and its periphery are shown in a plane, and the beam 3 shown on the right side of the pillar 2 and its periphery are horizontally arranged at the heights of the lower members 4c and 4d. The cross section taken up is shown, and the steel beam 3 shown on the left side of the column 2 and its surroundings are shown looking down at the cross section taken at the height of the upper members 4a, 4b.

  The beam-column joint structure 1 of the second embodiment is different from the beam-column joint structure 1 of the first embodiment in the configuration of the joint member 4, but is common in many points to the first embodiment. . Therefore, in the description of the second embodiment, the same reference numerals as those used in the first embodiment will be given to the portions described with reference numerals in the description of the first embodiment, and redundant description will be given. Is omitted.

  The joining member 4 of the second embodiment is composed of upper members 4a and 4b and lower members 4c and 4d. Each of the upper members 4a and 4b and the lower members 4c and 4d is made of a rectangular steel tube, and is attached to both sides of the web 3b in a direction in which the hollow cross section is continuous in the beam ridge direction. In other words, in each of the upper members 4a, 4b and the lower members 4c, 4d that form the joining member 4, the hollow section has a hollow section in a substantially longitudinal direction or a substantial gravity in a state where the column 2 and the beam 3 are joined. Each of them is attached to the side of the web 3b in a direction continuous to the direction.

  The upper members 4a and 4b are in contact with the upper flange 3a and have a height from the lower surface of the upper flange 3a to the middle portion of the web 3b. The lower members 4c and 4d are arranged below the upper members 4a and 4b at substantially the same height as the jaw 2a, and are in contact with the lower flange 3c. The upper members 4a, 4b have a rectangular cross section. The lower members 4c, 4d have a square cross section. The rectangular shape of the cross section of the upper members 4a and 4b has a short side substantially equal to one side of the square shape of the cross section of the lower members 4c and 4d. The surfaces of the upper members 4a and 4b that form the long sides of the rectangular section are arranged along the longitudinal direction of the beam 3. As a result, the surfaces of the upper members 4a, 4b and the lower members 4c, 4d on the opposite side of the web 3b are located on substantially the same plane. The upper members 4a and 4b and the lower members 4c and 4d are arranged such that the surfaces on the opposite side of the columns 2 are also located on substantially the same plane.

  A space in which the joining member 4 is not arranged is formed on the pillar 2 side of the lower members 4c and 4d. A notch is formed in the beam 3 in accordance with this space. In other words, at the end of the beam 3, the upper flange 3a and the upper portion of the web 3b project toward the column 2 side more than the lower portion of the web 3b and the lower flange 3c. As a result, a space for arranging the jaw 2a is formed below the end of the beam 3. The portions of the upper members 4a and 4b on the column 2 side are placed on the jaw 2a.

  On the upper members 4a and 4b, two sets of a PC tension member 6 and a pair of fixing tools 7 respectively arranged at both ends thereof are arranged vertically. One set of the PC tension member 6 and the pair of fixing tools 7 are arranged on the lower members 4c and 4d. The PC tension member 6 and the pair of fixing tools 7 are not limited to three sets and may be any number, and the numbers assigned to the upper members 4a and 4b and the lower members 4c and 4d are also arbitrary.

  According to the second embodiment described above, the same effect as the first embodiment can be obtained. In addition, the dimension by which the jaw 2a projects below the lower surface of the lower flange 3c of the beam 3 can be reduced, and a high ceiling height can be secured.

(Third Embodiment)
A third embodiment of the present application will be described with reference to FIGS. 3 (a) and 3 (b). FIG. 3A is a diagram showing a plane and a horizontal cross section of the beam-column joint structure 1 according to the third embodiment. FIG. 3B is a cross-sectional view showing a cross section of the beam-column joint structure 1 according to the third embodiment, which is cut in the vertical direction. In FIG. 3A, the beam 3 shown below the pillar 2 and its surroundings are shown as a plane, and the beams 3 shown at the left and right of the pillar 2 and their surroundings are shown as horizontal cross sections.

  The beam-column joint structure 1 according to the third embodiment is different from the beam-column joint structure 1 according to the first embodiment in that a filling material 8 is filled in the joining member 4, and other points. In common with the first embodiment. Therefore, in the description of the third embodiment, the parts described with reference numerals in the description of the first embodiment are denoted by the reference numerals used in the first embodiment, and overlap with the first embodiment. The description will be omitted.

  As the filler 8 filled in the joining member 4, concrete or non-shrink mortar can be used. As shown in FIG. 3A, since the opening (hollow cross section) of the joining member 4 projects beyond the upper flange 3a of the beam 3, the filling material 8 can be easily filled. The filling of the filling material 8 can be performed at a factory or a construction site. By filling the filling material 8 at the construction site, the weight of the beam 3 can be reduced when the beam 3 is transported from the factory to the construction site.

  According to the third embodiment described above, in addition to the effect of the first embodiment, by filling the joining material 4 with the filling material 8, a part of the tension force of the PC tension material 6 is reduced. The compressive force is transmitted to the joint between the column 2 and the beam 3 via the filling material 8, and it becomes possible to reduce the member cross-sectional size and wall thickness of the rectangular steel pipes 4a and 4b forming the joint member 4. There is more choice, and costs can be further reduced.

(Fourth Embodiment)
Next, a fourth embodiment of the present application will be described with reference to FIGS. 4 (a) and 4 (b). FIG. 4A is a diagram showing a plane and a horizontal cross section of the beam-column joint structure 1 according to the fourth embodiment. FIG. 4B is a cross-sectional view showing a cross section obtained by cutting the beam-column joint structure 1 according to the fourth embodiment in a vertical direction. In FIG. 4A, the beam 3 shown below the pillar 2 and its periphery are shown as a plane, and the beam 3 shown on the right side of the pillar 2 and its periphery are horizontally cut at the height of the lower members 4c and 4d. The cross-section of the steel beam 3 shown on the left side of the pillar 2 and its surroundings is viewed down the height of the upper members 4a and 4b.

  The beam-column joint structure 1 of the fourth embodiment is different from the beam-column joint structure 1 according to the second embodiment in that a filling material 8 is filled in the joint member 4, and other points. In common with the second embodiment. Therefore, in the description of the fourth embodiment, the same reference numerals as those used in the second embodiment are given to the portions described with the reference numerals in the second embodiment, and the same parts as those in the second embodiment. A duplicate description will be omitted.

  As the filler 8 filled in the joining member 4, concrete or non-shrink mortar can be used. As shown in FIG. 4 (a), the opening (hollow cross section) of the joining member 4 extends beyond the upper flange 3a of the beam 3, and the inside of the upper members 4a, 4b and lower members 4c, 4d. Since the space is also connected, the filling material 8 can be easily filled. The filling of the filling material 8 can be performed at a factory or a construction site. By filling the filling material 8 at the construction site, the weight of the beam 3 can be reduced when the beam 3 is transported from the factory to the construction site.

  According to the fourth embodiment described above, in addition to the effect of the second embodiment, the same effect as that of the third embodiment can be obtained.

  The invention of the present application is not limited to the above embodiment, and various modifications can be made. For example, although illustration is omitted, a cap is attached to the fixing tool 7 as a rust preventive treatment for the ends of the fixing tool 7 and the PC tension member 6 protruding from the pillar surface on the outer periphery of the building, and the inside of the cap is removed. It is desirable to add a rust preventive agent to the rust prevention treatment. The fixing tool 7 may be covered with non-shrink mortar so as not to be exposed. In addition, in the first and third embodiments described above, a square steel pipe having a rectangular cross section may be used as the joining member 4.

1 Column-beam joint structure 2 Column 2a Jaw 3 Steel beam 3a Upper flange 3b Web 3c Lower flange 4 Joining members 4a, 4b Square steel pipe (upper member)
4c, 4d Square steel pipe (lower member)
5 Joint mortar 6 PC tension material 7 Fixing tool 8 Filling material

Claims (3)

A beam composed of an H-section steel and a joining member provided at an end of the H-section steel is placed with the end placed on a jaw provided on a side surface of a concrete column,
A PC tension member is disposed so as to penetrate the column and the joining member, and the PC tension member is tensioned and fixed to the surface of the joining member on the side opposite to the column, whereby the column and the beam are integrated. A column-beam joint structure for chemical bonding,
The joining member is formed of a square steel pipe, and is provided on both sides of the web of the H-section steel so as to have hollow cross-sections that are continuous in the beam direction and are in contact with the upper and lower flanges of the H-section steel. Beam-column joint structure. The end portion has an upper portion projecting toward the pillar side more than a lower portion,
The joining member is formed of an upper member and a lower member,
The upper member is placed on the jaw so as to protrude toward the pillar more than the lower member,
The beam-column joint structure according to claim 1, wherein the lower member is arranged at substantially the same height as the jaw. The column-beam joint structure according to claim 1 or 2, further comprising a filling material filled in the joint member.

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