JP2017128916A - Column-to-beam joint structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a beam member to be joined to a connection part of a concrete column member depending on various sizes of step.SOLUTION: A column-to-beam joint structure includes: a concrete column member; a steel support member embedded in a joint part of the column member and comprising a steel plate surface formed in a vertical direction; a first steel beam member that has an end joined to the one steel plate surface of the support member; and a second steel beam member that has an end joined to the other steel plate surface of the support member and forms a step with respect to the first beam member.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a column beam connection structure in which a steel beam is bonded to a concrete column.

  There is a column beam connection structure in which a steel beam is bonded to a concrete column. For example, in Patent Document 1, an end portion of a beam member made of H-shaped steel is joined to a beam end member made of H-shaped steel joined to a joint member embedded in a joint portion of a column made of reinforced concrete. A column beam connection structure is disclosed. The beam end member and the end of the beam member are joined by bolting the lower flange, the upper flange, and the web using a splice plate.

  However, when a beam member made of H-section steel is to be joined by using such a column beam connection structure so as to form a step on both sides of the column joint, it is processed according to the size of the step. The mouth member must be manufactured individually. In addition, since such a joint member can be produced only after the size of the step of the beam member is determined, there is a concern that the construction period of the entire construction work may be delayed.

JP2015-121011A

  In view of such facts, the present invention has an object to be able to join a beam member to a joint portion of a concrete column member according to steps of various sizes.

  The invention of the first aspect includes a concrete column member, a steel support member provided with a steel plate surface embedded in the vertical direction of the column member and formed in the vertical direction, and one of the support members. A steel first beam member whose end is joined to the steel plate surface, and a steel second beam whose end is joined to the other steel plate surface of the support member and forms a step with the first beam member. And a beam member.

  In the first aspect of the invention, the first beam member and the second beam member are joined to the column member by joining the ends of the first beam member and the second beam member to the steel plate surface of the support member embedded in the joint portion of the column member. Two beam members can be joined.

  Further, the concrete of the column member causes the out-of-plane deformation generated in the support member due to the tensile force generated in the first beam member and the second beam member due to the bending moment acting on the first beam member and the second beam member. It can suppress by restraining. For this reason, a diaphragm is not required for the support member, and the number of parts can be reduced, so that the construction period can be shortened.

  Further, the first beam member and the second beam member may be joined to the support member so that the first beam member and the second beam member form a step in a range of one steel plate surface and another steel plate surface. it can. For this reason, steel beam members can be joined to the joints of the concrete column members according to various beam cross-sectional shapes and steps of various sizes.

  The invention of the second aspect has a reinforcing member provided on the inside or the outer peripheral surface of the column member so as to surround the end portion of the support member in the column beam connection structure of the first aspect.

  In the second aspect of the invention, the reinforcing member causes the out-of-plane deformation generated in the support member due to the tensile force generated in the first beam member and the second beam member due to the bending moment acting on the first beam member and the second beam member. It is possible to increase the scraping strength of the concrete of the column member. Thereby, the out-of-plane deformation generated in the support member due to the tensile force generated in the first beam member and the second beam member due to the bending moment acting on the first beam member and the second beam member can be further suppressed.

  According to a third aspect of the present invention, in the column beam connection structure according to the first or second aspect, the support member is a square steel pipe, and concrete is filled inside the square steel pipe.

  In the invention of the third aspect, by using a square steel pipe as the support member, the support member having a steel plate surface formed in the vertical direction can be configured with a simple member.

  Further, the surface generated in the support member due to the compressive force generated in the first beam member and the second beam member due to the bending moment acting on the first beam member and the second beam member due to the concrete filled inside the square steel pipe External deformation can be suppressed.

  Since this invention was set as the said structure, a beam member can be joined to the joint part of concrete pillar members according to the level | step difference of various magnitude | sizes.

It is a perspective view which shows the column beam junction structure which concerns on embodiment of this invention. It is AA sectional drawing of FIG. It is a perspective view which shows the support member with which the 1st beam member and 2nd beam member which concern on embodiment of this invention were joined. It is an enlarged view which shows the out-of-plane yield line height when an out-of-plane deformation | transformation arises in the support member. It is front sectional drawing which shows the effect | action and effect of the column beam junction structure which concern on embodiment of this invention. FIG. 6A, FIG. 6B, FIG. 6C, and FIG. 6D are plan cross-sectional views showing variations of the column beam connection structure according to the embodiment of the present invention. It is a plane sectional view showing the variation of the column beam junction structure concerning the embodiment of the present invention. It is a front view which shows the support member reinforced with the reinforcement plate which concerns on embodiment of this invention. It is front sectional drawing which shows the variation of the column beam junction structure which concerns on embodiment of this invention. It is a front view which shows the variation of the column beam junction structure which concerns on embodiment of this invention. 1 is a front view showing a precast column beam connection structure according to an embodiment of the present invention. 1 is a front view showing a precast column beam connection structure according to an embodiment of the present invention.

  Embodiments of the present invention will be described with reference to the drawings. First, a column beam joint structure according to an embodiment of the present invention will be described.

  As shown in FIG. 2 which is a perspective view of FIG. 1 and a cross-sectional view taken along line AA of FIG. 1, a column beam connection structure 10 of the present embodiment includes a column member 12 made of reinforced concrete, a support member 14 made of steel, The first beam member 16 made of steel and the second beam member 18 made of steel are included.

  The column member 12 is a prism having a substantially square cross section formed of reinforced concrete. Although omitted in FIG. 1, the column member 12 is provided with column main bars and shear reinforcement bars.

  As shown in the perspective view of FIG. 3, the support member 14 is formed of a square steel pipe having a substantially square cross section, and has a steel plate surface 20 as one steel plate surface and a steel plate surface 22 as another steel plate surface. Yes. The steel plate surface 20 and the steel plate surface 22 are formed in the up-down direction, and are arranged to face each other substantially in parallel. As shown in FIG.1 and FIG.2, the supporting member 14 is embed | buried under the joint part 24 with which the column member 12 is provided, and concrete is filled inside.

  As shown in FIG. 3, the first beam member 16 and the second beam member 18 are made of H-shaped steel, and the end of the first beam member 16 is welded to the steel plate surface 20, and the end of the second beam member 18 is The part is welded to the steel plate surface 22.

  The first beam member 16 and the second beam member 18 are arranged so as to be substantially in a straight line through the support member 14 in plan view, and the upper flange upper surfaces are at different heights (in this example, The height of the upper flange upper surface of the second beam member 18 is lower than the upper flange upper surface of the first beam member 16). Thereby, the first beam member 16 and the second beam member 18 form a step.

  In the support member 14, the upper end of the support member 14 protrudes above the upper flange upper surface of the first beam member 16 and the upper flange upper surface of the second beam member 18 with respect to the axial direction 26 of the support member 14. The lower end portion of the support member 14 protrudes below the lower flange lower surface of the first beam member 16 and the lower flange lower surface of the second beam member 18, and the axial direction of the upper end portion and the lower end portion of the protruding support member 14 Although the length of 26 is equal to or greater than the height of the out-of-plane yield line of the support member 14 or slightly shorter than the height of the out-of-plane yield line, it has a length that can maintain an appropriate margin for the beam strength. Thereby, the out-of-plane yield strength of the support member 14 can be improved.

  The enlarged view of FIG. 4 shows an out-of-plane deformation when the support member 14 is deformed out of plane due to a tensile force P generated on the upper flange of the first beam member 16 due to a bending moment acting on the first beam member 16. Yield line height H is shown.

  Next, the operation and effect of the column beam connection structure according to the embodiment of the present invention will be described.

  In the column beam joint structure 10 of the present embodiment, as shown in FIGS. 1 and 3, the first beam member 16 and the first beam member 16 are formed on the steel plate surfaces 20 and 22 of the support member 14 embedded in the joint portion 24 of the column member 12. The first beam member 16 and the second beam member 18 can be joined to the column member 12 by joining the end portions of the two beam members 18.

  Further, in the column beam joint structure 10 of the present embodiment, as shown in FIGS. 1 and 2, the first beam member 16 and the second beam member are caused by the bending moment acting on the first beam member 16 and the second beam member 18. The out-of-plane deformation generated in the support member 14 due to the tensile force generated in 18 can be suppressed by the support member 14 being constrained by the concrete of the column member 12 and the stirrups arranged in the concrete. .

  As a result, no diaphragm is required for the support member 14, and the number of parts necessary for joining the first beam member 16 and the second beam member 18 to the support member 14 can be reduced, thereby shortening the construction period. Further, beam members having various cross-sections (having various beam widths, beam formations, flange thicknesses, and web thicknesses) can be joined to the joint portion 24 of the column member 12. Furthermore, the thickness of the support member 14 can be reduced.

  In addition, the concrete filled inside the support member 14 made of a square steel pipe restrains the support member 14, so that the first beam member 16 and the first beam member 16 are caused by a bending moment acting on the first beam member 16 and the second beam member 18. The out-of-plane deformation generated in the support member 14 due to the compressive force generated in the two-beam member 18 can be suppressed.

  In FIG. 5, due to the bending moment M acting on the first beam member 16, a tensile force P is generated on the upper flange of the first beam member 16 and a compressive force F is generated on the lower flange of the first beam member 16. An example is shown. In this case, the out-of-plane deformation caused in the support member 14 due to the tensile force P can be suppressed by the concrete 28 of the column member 12 surrounding the support member 14 restraining the support member 14, The out-of-plane deformation that occurs in the support member 14 due to the compressive force F can be suppressed by the concrete 30 filled inside the support member 14 made of a square steel pipe restraining the support member 14.

  Furthermore, in the beam-column joint structure 10 of the present embodiment, as shown in FIG. 1, the bending moment acting on the first beam member 16 and the second beam member 18 is caused by the first beam member 16 and the second beam member 18. Since it is reduced by the concrete of the pillar member 12 surrounding the end portion, this bending moment can be reduced, and thereby the out-of-plane deformation occurring in the support member 14 can be further suppressed.

  Moreover, in the column beam connection structure 10 of this embodiment, as shown in FIG.1 and FIG.2, in the range of the steel plate surface 20 and the steel plate surface 22, the 1st beam member 16 and the 2nd beam member 18 form a level | step difference. Thus, the first beam member 16 and the second beam member 18 can be joined to the support member 14. Accordingly, the first beam member 16 and the second beam member 18 can be joined to the joint portion 24 of the concrete column member 12 according to various beam cross-sectional shapes and steps of various sizes.

  Furthermore, it is not necessary to individually manufacture the support member 14 according to the size of the step, and the member can be shared, so that the support member 14 can be made. Thereby, it is possible to reduce or eliminate the delay in the construction period when the timing for determining the size of the step between the first beam member 16 and the second beam member 18 is delayed.

  Moreover, in the column beam connection structure 10 of this embodiment, as shown in FIG. 3, the support member provided with the steel plate surface formed in the up-down direction is used as a simple member by making the support member 14 into a square steel pipe. Can be configured.

  The embodiment of the present invention has been described above.

  In the present embodiment, as shown in FIG. 2, the first beam member 16 and the second beam member 18 forming a step are arranged so as to be substantially straight in a plan view and joined to the support member 14. However, the first beam member 16 and the second beam member 18 forming the step may be arranged so as to be orthogonal to each other in plan view and joined to the support member 14. Further, as in the column beam connection structure 32 shown in the plan sectional view of FIG. 6A, the first beam member 16 and the second beam member 18 are arranged so as to protrude in four directions in a plan view, thereby supporting members. 14 may be joined, or the first beam member 16 and the second beam member 18 may be arranged so as to project in three directions in plan view and joined to the support member 14.

  Further, in the present embodiment, as shown in FIG. 2, an example in which concrete is filled inside the support member 14 is shown, but the concrete may not be filled inside the support member 14.

  Furthermore, in this embodiment, as shown in FIG.2 and FIG.3, although the example which made the supporting member 14 the square steel pipe of a substantially square cross section was shown, a supporting member is formed over the up-down direction, and is 1st. What is necessary is just a member provided with the one steel plate surface to which the edge part of the beam member 16 is joined, and the other steel plate surface formed in the up-down direction and to which the edge part of the 2nd beam member 18 is joined. For example, the support member may be a square steel pipe having a square or rectangular cross section, or may be a polygonal steel pipe having a triangular or octagonal cross section.

  Further, for example, the column beam connection structures 34, 36, and 38 shown in the cross-sectional plan views of FIGS.

  In the column beam connection structure 34 of FIG. 6B, the reinforcing structure 40 is provided in the support member 14. The reinforcing structure 40 includes steel plates 42, 44, and 46 that are arranged in a cross shape so as to be orthogonal to each other when viewed from above and are integrated. It is joined to the inner surface of the support member 14.

  In this way, the steel plates 42, 44, 46 bear a part of the tensile force and compressive force acting on the support member 14 from the first beam member 16 and the second beam member 18. External deformation can be further suppressed.

  In the column beam connection structure 36 of FIG. 6C, the support member 48 includes an H-shaped steel 50 and T-shaped steels 52 and 54, which are arranged in a cross shape so as to be orthogonal to each other in plan view. It is configured.

  With this configuration, a bending moment acting on the first beam member 16 and the second beam member 18 acts on the flange portions of the H-shaped steel 50 and the T-shaped steels 52 and 54 from the first beam member 16 and the second beam member 18. The out-of-plane deformation that occurs in the flange portions of the H-section steel 50 and the T-section steels 52 and 54 due to the tensile force and the compressive force is provided on the out-of-plane deformation resistance of the flange portion and on the inside and outside of the flange portion. The concrete portion and the web portions of the H-shaped steel 50 and the T-shaped steels 52 and 54 can be suppressed by restraining the flange portions of the H-shaped steel 50 and the T-shaped steels 52 and 54.

  6 (d), the support member 56 has an H-shaped steel 50 and a T-shaped steel 52, which are arranged and integrated in a T shape so as to be orthogonal in a plan view. Configured. The support member 56 may be one without the T-shaped steel 52. That is, the support member 56 may be configured by only the H-shaped steel 50.

  Further, for example, a steel reinforcing plate 60 may be provided on the support member 48 shown in FIG. 6C, as in the column beam connection structure 58 shown in the plan sectional view of FIG. As shown in the front views of FIGS. 7 and 8, the reinforcing plates 60 are adjacent to each other so that the position of the central portion in the vertical direction is the height of the vertical flanges of the first beam member 16 and the second beam member 18. The end portions of the flange portions of the H-shaped steel 50 and the T-shaped steels 52 and 54 are joined to the end portions of the flange portions.

  In this way, the bending moment acting on the first beam member 16 and the second beam member 18 causes the flange portions of the H-shaped steel 50 and the T-shaped steels 52 and 54 from the first beam member 16 and the second beam member 18. A part of the acting tensile force and compressive force is transmitted to the concrete forming the column member 12 through the reinforcing plate 60 and dispersed, so the surfaces of the flange portions of the H-shaped steel 50 and the T-shaped steels 52 and 54 are dispersed. External deformation can be further suppressed. In addition, you may comprise the reinforcement plate 60 arrange | positioned up and down by one plate.

  Moreover, in this embodiment, as shown in FIG. 1, although the example which comprised the support member 14 by embedding in the joint part 24 with which the column member 12 was equipped and comprised the column beam junction structure 10 was shown, front sectional drawing of FIG. As shown in the column beam connection structure 62 shown in the figure, a plurality of band reinforcing bars 64 as reinforcing members may be provided in a concentrated manner inside the column member 12 so as to surround the upper and lower ends of the support member 14. The strip reinforcing bars 64 are arranged so as to reach the concrete cone breaking region S of the column member 12 which finally occurs near the upper and lower flange ends of the first beam member 16 and the second beam member 18.

  In this way, the out-of-plane deformation that occurs in the support member 14 due to the tensile force generated in the first beam member 16 and the second beam member 18 due to the bending moment acting on the first beam member 16 and the second beam member 18. It is possible to increase the scraping strength of the concrete of the column member 12 by the plurality of strip reinforcing bars 64. Accordingly, the out-of-plane deformation generated in the support member 14 due to the tensile force generated in the first beam member 16 and the second beam member 18 due to the bending moment acting on the first beam member 16 and the second beam member 18 is further suppressed. can do.

  Furthermore, in this embodiment, as shown in FIG. 1, the example in which the support member 14 is embedded in the joint portion 24 included in the column member 12 to configure the column beam joint structure 10 is shown. As shown in the column-beam joint structure 66 shown in FIG. 4, steel band plates 68 as reinforcing members may be provided on the outer peripheral surface of the column member 12 so as to surround the upper and lower ends of the support member 14. The band plate 68 is formed so as to cover a part of the concrete cone breaking region S of the column member 12 which is finally generated near the flange end portions of the first beam member 16 and the second beam member 18. It is provided so as to be wound around the surface.

  In this way, the out-of-plane deformation that occurs in the support member 14 due to the tensile force generated in the first beam member 16 and the second beam member 18 due to the bending moment acting on the first beam member 16 and the second beam member 18. The strip plate 68 can increase the concrete scraping strength of the column member 12. Accordingly, the out-of-plane deformation generated in the support member 14 due to the tensile force generated in the first beam member 16 and the second beam member 18 due to the bending moment acting on the first beam member 16 and the second beam member 18 is further suppressed. can do.

  Moreover, the beam-column joint structure 10 (see FIG. 1) shown in the present embodiment may be constructed by construction on site, or the beam-column joint structure 70 shown in the front views of FIGS. 11 and 12. , 72 may be constructed using a column member 12 made of precast concrete manufactured in a factory or the like.

  FIG. 11 shows a column beam joint structure 70 as an example using the column member 12 made of precast concrete. The column member 12 is joined to a lower column 74 formed at the lower end portion from reinforced concrete, and joined to an upper column 76 formed at the upper end portion from reinforced concrete. The first beam member 16 and the second beam member 18 are bolted to the beam member using a splice plate (not shown).

  FIG. 12 shows a column beam joint structure 72 as an example using the column member 12 made of precast concrete. The column member 12 has a lower end joined to the lower pillar 78 made of precast concrete and an upper end joined to the upper pillar 80 made of precast concrete. The first beam member 16 and the second beam member 18 are bolted to the beam member using a splice plate (not shown).

  Further, for example, the axial length of the column member 12 of FIGS. 11 and 12 is such that the upper end surface of the column member 12 coincides with the upper end surface of the support member 14, and the lower end surface of the column member 12 is the lower end surface of the support member 14. May be matched. Furthermore, for example, the axial length of the pillar member 12 in FIGS. 11 and 12 may be set to the height of one or two layers of the building.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to such embodiment at all, Of course, in the range which does not deviate from the summary of this invention, it can implement in a various aspect.

10, 32, 34, 36, 38, 58, 62, 66, 70, 72 Column-beam joint structure 12 Column member 14, 48, 56 Support member 16 First beam member 18 Second beam member 20, 22 Steel plate surface 24 Finish Mouth 64 Band Reinforcing Bar
68 Band plate (reinforcing member)

Claims (3)

Concrete column members,
A steel support member provided with a steel plate surface embedded in the vertical direction of the column member and formed in the vertical direction;
A steel first beam member having an end joined to the steel plate surface of the support member;
An end part is joined to the other steel plate surface of the support member, and the second beam member made of steel that forms a step with the first beam member;
Column beam connection structure.   The column beam connection structure according to claim 1, further comprising a reinforcing member provided on an inside or an outer peripheral surface of the column member so as to surround an end portion of the support member.   The column beam connection structure according to claim 1 or 2, wherein the support member is a square steel pipe, and concrete is filled inside the square steel pipe.