JP2014227681A - Joining structure of reinforced concrete member and steel frame member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a joining structure of a reinforced concrete member and a steel frame member, capable of suitably rigidly joining the steel frame member to the reinforced concrete member.SOLUTION: A joining structure B of a reinforced concrete member and a steel frame member, is provided for burying and joining an end part 1a side of a steel frame member 1 inside a reinforced concrete member 3, and a joining part 6 is formed by integrally providing a horizontal member 5 extending in the traverse direction orthogonal to a member axis O1 of the steel frame member 1 in the end part 1a of the steel frame member 1. The horizontal member 5 is locked on or joined to the reinforced concrete member 3 by burying the horizontal member 5 of the joining part 6 in the reinforced concrete member 3 or while penetrating the end part 1a side of the steel frame member 1 through the reinforced concrete member 3, and is constituted so that the steel frame member 1 is rigidly joined to the reinforced concrete member 3.

Description

  The present invention relates to a joint structure between a reinforced concrete member and a steel member.

  Conventionally, for example, in medium- and high-rise buildings such as office buildings, an RC core wall (reinforced concrete member) is provided as a seismic wall in the core of the central part, and the end of the core wall is joined to a steel beam (steel member) ) Is used to increase the span, and a structure that forms a large space with few pillars is often used. This type of building exhibits excellent seismic performance by bearing most of the horizontal force acting during an earthquake or strong wind with a rigid core wall (core part). In addition, a vibration damper is provided as a boundary beam between adjacent core walls, and the vibration energy is absorbed by the vibration damper, thereby further improving the earthquake resistance.

  On the other hand, in this type of building, generally, as shown in FIG. 23, for example, an end plate 2 is attached to an end portion 1a of a steel beam 1, and an anchor bolt 4 is attached to an RC core wall 3 via the end plate 2. There are many cases in which the joint structure A between the RC core wall 3 and the steel beam 1 is designed as a pin joint (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 06-065963

  However, in the structure in which the steel beam is joined to the RC core wall, the span is increased, and the steel beam is joined to the core wall as a pin joint. Therefore, the inspection for the deflection limit of 1/300 or less becomes severe. If the joint between the core wall and the steel beam can be made rigid, the flexural deformation can be reduced to about 1/5 and a rational design is possible. Therefore, it is difficult to secure a rigid joint, and there is a problem that a rigid joint cannot be realized. Therefore, development of a new joint structure that enables the rigid joint has been strongly desired.

  In view of the above circumstances, an object of the present invention is to provide a joint structure between a reinforced concrete member and a steel member that can suitably rigidly join the steel member to the reinforced concrete member.

  In order to achieve the above object, the present invention provides the following means.

  The joint structure of a reinforced concrete member and a steel member according to the present invention is a joint structure of a reinforced concrete member and a steel member that is joined by burying an end portion side of the steel member in the interior of the reinforced concrete member, and is connected to the end of the steel member. A horizontal member extending in the transverse direction perpendicular to the material axis of the steel member is integrally provided to form a joint, and the horizontal member of the joint is embedded in the reinforced concrete member, or the end of the steel member is connected to the end of the steel member. The horizontal member is locked or joined to the reinforced concrete member while penetrating the reinforced concrete member, and the steel member is rigidly joined to the reinforced concrete member.

  Moreover, in the joining structure of the reinforced concrete member and the steel member of the present invention, it is desirable that the joining portion is configured to include a projecting member that is connected to the horizontal member and projects in a direction perpendicular to the horizontal member.

  In the joining structure of the reinforced concrete member and the steel member according to the present invention, the joining portion is configured as described above, whereby the rigid joining of the reinforced concrete member and the steel member can be realized, and a conventional pin joining method and In comparison, the bending deformation of the steel member can be reduced to about 1/5. This makes it possible to design rationally even when a large span is intended.

It is a cross-sectional view which shows the joining structure of the reinforced concrete member and steel member which concern on one Embodiment of this invention, and is a figure which shows the joining structure which comprised the junction part only with the horizontal member. It is the X1-X1 arrow view figure of FIG. FIG. 2 is an X2-X2 arrow view of FIG. 1. It is a cross-sectional view which shows the joining structure of the reinforced concrete member and steel member which concern on one Embodiment of this invention, and is a figure which shows the joining structure which comprised the junction part with the horizontal member and the vertical member (projection member). It is a X1-X1 line arrow directional view of FIG. FIG. 5 is a view taken along line X2-X2 in FIG. 4. It is a longitudinal cross-sectional view which shows the example of a change of the joining structure of the reinforced concrete member and steel member which concerns on one Embodiment of this invention, and is a figure which shows the joining structure of the state which provided the vertical member (projection member) only in the lower side of the horizontal member It is. It is a longitudinal cross-sectional view which shows the example of a change of the joining structure of the reinforced concrete member and steel member which concerns on one Embodiment of this invention, and is a figure which shows the joining structure of the state which provided the vertical member (projection member) only on the upper side of the horizontal member. is there. It is a longitudinal cross-sectional view which shows the example of a change of the joining structure of the reinforced concrete member and steel member which concerns on one Embodiment of this invention, and is a figure which shows the joining structure using a shear key as a vertical member (projection member). It is a longitudinal cross-sectional view which shows the example of a change of the joining structure of the reinforced concrete member and steel member which concerns on one Embodiment of this invention, and is a figure which shows the joining structure using a stud as a vertical member (projection member). It is a figure which shows the definition of the length of each part used when designing the joining structure of the reinforced concrete member and steel member which concern on one Embodiment of this invention. FIG. 12 is a view taken along the line X1-X1 in FIG. 11 and is a diagram illustrating the definition of the length of each part used when designing a joint structure between a reinforced concrete member and a steel member according to an embodiment of the present invention. It is the figure which modeled the bending resistance of the flange of a horizontal member in the junction structure of a reinforced concrete member and a steel frame member concerning one embodiment of the present invention. It is the figure which modeled the bearing resistance of concrete in the joining structure of the reinforced concrete member and steel member concerning one embodiment of the present invention. It is the figure which modeled the torsional resistance of the vertical member in the joining structure of the reinforced concrete member and steel member concerning one embodiment of the present invention. It is a cross-sectional view showing a modified example of the joining structure of a reinforced concrete member and a steel member according to an embodiment of the present invention, and is a diagram showing a joining structure using a steel beam extending in the wall direction as a horizontal member, and a rib. It is a figure which shows the joining structure which provided and reinforced the horizontal member. It is a X1-X1 line arrow directional view of FIG. It is the X2-X2 line arrow directional view of FIG. It is a cross-sectional view which shows the joining structure of the reinforced concrete member and steel member which concerns on one Embodiment of this invention, and provided the width stop bar for transmitting the bearing stress of concrete to the main reinforcement, and the joining structure which comprised the reinforced concrete member FIG. It is a longitudinal cross-sectional view which shows the joining structure of the reinforced concrete member and steel member which concern on one Embodiment of this invention, and provided the width stop bar for transmitting the bearing stress of concrete to the main reinforcement, and the joining structure which comprised the reinforced concrete member FIG. It is a cross-sectional view which shows the example of a change of the joining structure of the reinforced concrete member and steel member which concerns on one Embodiment of this invention, and is a figure which shows the joining structure which provided the rib and reinforced the horizontal member. It is the X1-X1 line arrow directional view of FIG. It is a cross-sectional view which shows the joining structure of the conventional reinforced concrete member and a steel frame member.

  Hereinafter, a joint structure of a reinforced concrete member and a steel member according to an embodiment of the present invention will be described with reference to FIGS.

  Here, the present embodiment relates to a structure for joining an S-shaped beam (steel member) to an RC wall (reinforced concrete member). In this embodiment, the RC wall is a core wall provided as a seismic wall in the center of a middle or high-rise building such as an office building, and the S-beam is joined to the core wall. The description will be made assuming that the steel beam is a steel beam for increasing the span.

  However, the joining structure of the reinforced concrete member and the steel frame member according to the present invention does not need to limit the reinforced concrete member to a core wall (wall), and the reinforced concrete member may be a column, a foundation, a pier, an abutment, or the like. Further, it is not necessary to limit the steel member to a steel beam, and the steel member may be a column or a girder. That is, it is not particularly necessary to limit the reinforced concrete member to a core wall (wall) and the steel member to a steel beam, and the present invention can be applied to all cases where a reinforced concrete member and a steel member are joined.

  In the joint structure of the reinforced concrete member and the steel member of the present embodiment (hereinafter referred to as the joint structure of the present embodiment), the end of the S steel beam is embedded in the RC core wall, and the torsional resistance of the embedded steel beam is used. It is configured to realize a rigid joint between the core wall and the steel beam.

  Specifically, in the joint structure B of the present embodiment, as shown in FIGS. 1 to 3, the steel beam 1 is H-shaped steel, and the material axis O1 of the steel beam 1 is attached to the end 1a of the steel beam 1. The horizontal member 5 extending in the lateral direction orthogonal to the above is joined. Further, the horizontal member 5 of the present embodiment is a steel member made of H-shaped steel, and is integrally joined to the end portion 1a of the steel beam 1 by welding or bolt joining, and the horizontal member 5 is attached to the end portion 1a of the steel beam 1 A joint portion 6 is constituted by a portion where 5 is joined.

  And in the joining structure B of this embodiment, the edge part 1a side of the steel beam 1 is embed | buried inside the core wall 3 with predetermined | prescribed embedding length with the horizontal member 5 (joining part 6). Thereby, the steel beam 1 and the core wall 3 are rigidly joined via the joining part 6 which consists of the horizontal member 5 of H-section steel.

  Here, in the joint structure B of the present embodiment, as shown in FIGS. 4 to 6, the horizontal member 5 is connected to the end portion 1 a of the steel beam 1 and connected to the horizontal member 5 in the vertical direction. The joint 6 may be configured by providing a projecting vertical member (a projecting member projecting in a direction perpendicular to the horizontal member 5 (including a substantially perpendicular direction)) 7. As the vertical member 7, for example, a steel member 7a such as an H-shaped steel shown in FIGS. 4 to 6, 7, and 8, a shear key 7b shown in FIG. 9, a stud 7c shown in FIG. it can. Further, as shown in FIGS. 4 to 6, the horizontal member 5 is provided both above and below to form a cross-shaped joint 6, or as shown in FIGS. 7 and 8, the horizontal member 5. However, it may be provided on either the upper side or the lower side to form a T-shaped or inverted T-shaped joint 6. In addition, what is necessary is just to make it use suitably said form, a structure, etc. according to required proof stress or workability about the form and structure of the junction part 6 at the time of providing the vertical member 7. FIG.

  And the torsional resistance of the embedded steel members (horizontal member 5, vertical member 7) in the joint structure B of the present embodiment is calculated by the following formulas (1) to (4), and exceeds the design strength of the steel beam 1 Make sure it can be secured. In addition, the definitions of the length of each part in the equations (1) to (4) are shown in FIGS. 11 and 12, and the models of the torsion resistance mechanism are shown in FIGS.

In addition, in Formula (1)-Formula (4), the meaning of each symbol is as follows.
_j M _d : Torsional resistance of embedded steel member
_H M _d : Torsional resistance of horizontal member
_f M _y : Torsion resistance of the flange of the horizontal member
_s σ _y : Yield strength of flange of horizontal member b: Width of horizontal member t _f : Flange plate thickness of horizontal member l: Length of horizontal member
_{V Q:} Shear Resistance of vertical members (by each format)
_b M _d : Design strength of steel beam
_V M _d : Torsional resistance of the vertical member
_{c M c:} Concrete Bearing torsional resistance b: Concrete acceptable Bearing Strength h: because of the horizontal member
_{V l:} distance from the vertical member center of gravity to the center of rotation
_c f _c : Allowable bearing capacity of concrete

  Further, when the embedded steel member (horizontal member 5) is longer than the member in the horizontal direction, the torsional resistance per unit length is reduced. For this reason, in this case, as shown in FIGS. 16 to 18, the torsional resistance per unit can be increased by providing ribs 8 on the horizontal member 5 at the pitch of the member. Further, the reinforcement of the reinforced concrete member 3 such as the core wall is shown in FIGS. 19 and 20 so that the supporting stress of the concrete accompanying the torsion shown in FIGS. 13 to 15 can be transmitted to the main reinforcement (wall reinforcement). Thus, the width stop bars 9 and the like are appropriately arranged in the wall plate thickness direction (member thickness direction). Furthermore, it is designed so that the embedded steel member (horizontal member 5) does not yield due to the panel shear force accompanying the input bending of the steel member (steel beam) 1. In this case, it is effective to reinforce the panel zone with ribs 10 as shown in FIGS.

  Therefore, according to the joint structure B between the reinforced concrete member and the steel member of the present embodiment, the rigid joint between the RC core wall 3 and the steel beam 1 can be realized by configuring the joint 6 as described above. The bending deformation of the steel beam 1 can be reduced to about 1/5 compared with the conventional pin joining method. That is, even when a large span is intended, a rational design is possible.

  As mentioned above, although one Embodiment of the joining structure of the reinforced concrete member and steel frame member concerning this invention was described, this invention is not limited to said one Embodiment, It can change suitably in the range which does not deviate from the meaning. is there.

  For example, even if the steel beam 11 disposed along the wall direction as shown in FIGS. 16 to 18 is diverted as the horizontal member 5 that is connected to the end 1a of the steel beam 1 and constitutes the joint portion 6, Good.

  Further, the joint member 6 including the horizontal member 5, the horizontal member 5, and the vertical member 7 provided at the end 1 a of the steel member (steel beam) 1 is not necessarily embedded in the reinforced concrete member (core wall) 3. Alternatively, the steel member 1 is penetrated through the reinforced concrete member 3, and a joint portion 6 composed of the horizontal member 5 (and the vertical member 7) is provided at the end portion 1a, and the joint portion 6 is locked to the reinforced concrete member 3, or The steel member 1 may be rigidly joined to the reinforced concrete member 3 by, for example, bolt joining. Even in this case, it is possible to obtain the same effect as that of the present embodiment.

1 Steel beam (steel member)
1a End 2 End Plate 3 Core Wall (Reinforced Concrete Member)
4 Anchor bolt 5 Horizontal member 6 Joint 7 Vertical member 7a H-section steel (steel frame)
7b Shear key 7c Stud 8 Rib 9 Securing bar 10 Rib 11 Steel beam A Joint structure B of conventional reinforced concrete member and steel member B Joint structure of reinforced concrete member and steel member O1 Material shaft of steel member

Claims (2)

It is a joining structure of a reinforced concrete member and a steel member that embeds and joins the end side of the steel member inside the reinforced concrete member,
A horizontal member extending in the transverse direction perpendicular to the material axis of the steel member is integrally provided at the end of the steel member to form a joint,
The horizontal member is embedded in the reinforced concrete member, or the horizontal member is locked or joined to the reinforced concrete member while passing the end side of the steel member through the reinforced concrete member. A reinforced concrete member and a steel member joining structure, wherein the reinforced concrete member is rigidly joined to the reinforced concrete member. In the joining structure of the reinforced concrete member according to claim 1 and the steel frame member,
A joining structure of a reinforced concrete member and a steel frame member, comprising a projecting member connected to the horizontal member and projecting in a direction perpendicular to the horizontal member.

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