JPH0452356A - Rc pole and src pole of cruciform cross section - Google Patents

Abstract

PURPOSE:To prevent cracking due to shear, buckling of each main reinforcing bar, and expansion of concrete by disposing main reinforcing bars near the outside corner portions of each projecting portion and near those sides of a center rectangular portion which are opposite to an upper projecting portion and a side projecting portion, and disposing a band reinforcing bar around each main reinforcing bar. CONSTITUTION:Main reinforcing bars 11a, 11b each made by an iron bar for normal reinforcement are disposed near the respective outside corner portions of an upper projecting portion S1 and a side projecting portion S2, and also similar main reinforcing bars 11a, 11b are disposed opposite to the above main reinforcing bars 11a, 11b near those sides of a center rectangular portion R which are opposite to the upper projecting portion S1 and the side projecting portion S2. A rectangular band reinforcing bar 12a is disposed outside each main reinforcing bar 11a, 11c while in contact therewith. Also a rectangular band reinforcing bar 12b is disposed outside each main reinforcing bar 11b, 11c while in contact therewith. The rectangular band reinforcing bars 12a, 12b are each formed by bending of a long iron bar or connection of shortly cut iron bars to each other and a normal connecting means such as welding, etc., is used for connecting the iron bars together.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to RC columns and SRC columns with L-shaped cross sections;
In particular, it relates to RC columns and SRC columns with L-shaped cross sections that include main reinforcements and tie reinforcements that increase the binding force of concrete.

BACKGROUND OF THE INVENTION Most conventional reinforced concrete columns (referred to as RC columns in this specification) and steel reinforced concrete columns (referred to as SRC columns in this specification) have a rectangular or circular cross section.

Examples of the arrangement of the main reinforcement 1, tie reinforcement 2, connecting reinforcement 3, etc. of an RC column with a rectangular or circular cross section are as shown in Figs. 26 and 27. Examples of the arrangement of the steel frame 4, main reinforcement 1, and tie reinforcement 2 of the SRC column are as shown in FIGS. 28 and 29. RC of these square or circular cross sections
The mechanical performance of columns and SRC columns has been fully elucidated through numerous experiments.

When constructing a building using columns with a square or circular cross section, the thickness of the wall that is formed integrally with the square or circular column is generally determined to be less than the length of one side of the square or the diameter of the circle. Because they are made smaller, the right-angled corners of square columns and the arcuate portions of circular columns protrude into the corners of the room space, and these protrusions impede effective use of the room space. Therefore, there is a proposal to make the cross section of the pillar L-shaped.

Problems to be Solved by the Invention Since the bending moment generated in a column changes depending on the direction of horizontal load, the shape of the cross section of the column is symmetrical, square,
The overwhelming majority are rectangular and circular.

The main reinforcing bars 1 are also arranged symmetrically with respect to the center of gravity axis of the column, and the tie bars 2 are arranged around the main reinforcing bars 1.

The tie reinforcement 1 has the function of preventing cracks due to shear force, and the main reinforcement 1
It is required to have the function of preventing concrete from buckling, preventing concrete from extruding, and ensuring stickiness. Therefore,
In order to fulfill the above function, in conventional RC columns and SRC columns with a square or circular cross section, for example, the 26th
The shape and arrangement as shown in Figures 29 to 29 are adopted.

However, even though it has been proposed to use RC columns and SRC columns with an L-shaped cross section for the purpose of making effective use of room space, the main bars and tie bars for the RC columns and SRC columns with an L-shaped cross section are The shape and arrangement of steel frames, etc., are still not fully understood. Therefore, RC columns and SRC columns with L-shaped cross sections are hardly ever put into practical use.

The problem to be solved by the invention of this application is to create an RC column with an L-shaped cross section and an SR column with a sufficient function as a column.
To provide a C column, in other words, an RC column and SR with an L-shaped cross section that can prevent cracking due to shear force, prevent buckling of main reinforcement, and prevent concrete extrusion.
The aim is to provide pillar C.

Means for Solving the Problems The present invention employs the following configuration as a means for solving the problems described above.

The structure of the present invention is an RC column having an L-shaped cross section, including main reinforcements and tie reinforcements, and consisting of a central rectangular portion, a rectangular upper protruding portion, and a rectangular side protruding portion protruding from the central rectangular portion. ,
A main reinforcement is arranged near the outer corner of each protrusion, and a main reinforcement is provided near the side of the central rectangular part on the opposite side of the upper protrusion and lateral protrusion. Main reinforcements are arranged to face the arranged main reinforcements, and first tie reinforcements are arranged around the main reinforcements arranged in the upper protrusion and the central rectangular part, and The RC column has an L-shaped cross section and is characterized in that a second tie reinforcement is provided around the main reinforcement provided in the rectangular portion.

In a preferred embodiment, the first stirrup and the second stirrup are:
Use rectangular ties. The first stirrup and the second stirrup are
Although it is constructed by joining the ends of reinforcing bars bent into a rectangular shape, it is also possible to use a lattice-shaped reinforcing bar in which the middle parts of reinforcing bars are connected in a rectangular shape and connected with connecting reinforcing bars or the like to form a lattice shape. The first strap and the second strap are arranged so as to intersect each other at a substantially right angle in plan view.

If necessary, a main reinforcing bar is arranged at the inner corner of the intersection of the first stirrup and the second stirrup in plan view of the central rectangular part near the inner corner of the L-shape. .

A reinforcing bar that is effective against axial force is extended in the longitudinal direction of the column at or near the center of the square part surrounded by the first stirrup and the second stirrup of the central rectangular part in plan view. and arrange it.

Main reinforcements are provided at each corner of a rectangle in plan view in the upper and side projections of the L-shaped RC column, and rectangular reinforcing bars are provided around each of the main reinforcements. If necessary, main reinforcements are also provided at each corner of the square in plan view in the central rectangular part from the outer corner of the L-shape, and rectangular reinforcing bars are placed around each of these main reinforcements. Arrange.

If necessary, the part surrounded by the above-mentioned rectangular reinforcing bars, the part surrounded by the first and second reinforcing bars of the central rectangular part, reinforcing bars, cage-shaped reinforcing bars, and reinforcing bars may be added. The pillars are buried and reinforced concrete rods are placed extending in the longitudinal direction of the pillars.

In some cases, reinforcing bars are provided within the L-shaped RC column so as to be inclined with respect to the vertical or horizontal center line of the central rectangular portion to withstand high axial forces.

Further, the structure of the present invention is L-shaped, including an L-shaped steel frame, main reinforcement, and tie reinforcement, and consisting of a central rectangular portion, a rectangular upper protruding portion, and a rectangular side protruding portion protruding from the central rectangular portion. In the SRC column with a cross section of Main reinforcing bars are arranged opposite to the main reinforcing bars arranged on the protruding part and the side protruding part, and through holes are made in each web of the L-shaped steel frame, and the main reinforcing bars arranged on the upper protruding part and the main reinforcing bars opposite thereto are provided. A first strap is provided through the through hole around the main reinforcing bar disposed in the central rectangular part, and a first strap bar is provided around the main reinforcing bar disposed in the lateral protrusion and opposite to the main reinforcing bar in the central rectangular part. The cross section is L, characterized in that a second tie reinforcement is provided around the provided main reinforcement through the through hole.
It is located on the SRC column of the cross section of the letter.

In the case of an L-shaped SRC column, if necessary, it is necessary to Main reinforcements are placed at the corners, or around each main reinforcement placed at the corners of a square in plan view within each protruding part of an L-shaped SRC column or within the central rectangular part from the outer corner of the L-shape. For example, square-shaped reinforcing bars may be placed in the area.

The L-shaped steel frame of an L-shaped SRC column consists of H-shaped steel and T-shaped steel.
It may be manufactured using shaped steel, or it may be assembled using L-shaped steel, steel plates, etc.

A plurality of through holes through which the stirrups are passed are opened at predetermined positions in the two webs of the L-shaped steel frame.

A main reinforcement arranged inside the corner of a quadrangular part surrounded by the first stirrup and the second stirrup in plan view;
Reinforcement bars are arranged diagonally between the sides of the L-shaped steel web to increase the restraining integrity of the concrete and to withstand high axial forces.

The L-shaped RC and SRC columns of this invention may be formed by casting in place or by precasting.

Examples The L-shaped cross-section RC columns and SRC columns of this invention are:
For example, L of a building with pillar arrangement as shown in Figure 25.
It is used as a character-shaped pillar C1.

The cross-sectional shape of the L-shaped column C1 is as shown in FIG.
Center line P1 of one rectangle P and center line Q1 of the other rectangle Q
intersect at a right angle, and the side P2 of one rectangle P that is perpendicular to the center line P1 coincides with the side Q2 of the other rectangle Q that is parallel to the center line Q1, and the other rectangle Q
Two rectangles P when two rectangles P and Q are overlapped so that the side Q2 perpendicular to the center line Q1 of one rectangle P coincides with the side P2 parallel to the center line P1 of one rectangle P, An L-shaped shape formed by combining Q, that is, a central rectangular portion R, a rectangular upper protrusion S1 that protrudes upward from the central rectangular portion R, and a rectangular lateral protrusion that protrudes laterally. Department S
Match the shape consisting of 2. The lengths of the long sides and short sides of the two rectangles P and Q are determined as appropriate depending on the building to be constructed.

An RCCl2O embodiment of the present invention will be explained using FIGS. 2 to 19.

The arrangement of the main reinforcement of the RC column, the shape of the stirrup bars, the basic type of their arrangement, etc. are shown in FIGS. 2 to 11.

In the basic model shown in FIG. 2, main bars 11a and llb of iron bars for normal reinforcing bars are arranged near the outer corners of the upper protrusion S1 and the side protrusion S2, respectively, and the upper protrusion S1
Similar main reinforcements 11a and 11b are arranged near the side of the central rectangular portion R on the side opposite to the lateral protrusion S2, facing the main reinforcements 11a and llb. An appropriate number of main reinforcing bars 11c are also arranged between the main reinforcing bars 11a, llb and the main reinforcing bars 11a, llb, as necessary. And each main reinforcement 11a, 11
A rectangular strap 12a is provided on the outside of c and in contact with these. Further, a rectangular strap 12b is arranged on the outside of each of the main reinforcements 11b, llc in contact with them. Stirrup 12a and Stirrup 1
Strap 1 between the intersection 13 of 2b and the main reinforcements 11a and llb
An appropriate number of main reinforcing bars are also arranged inside 2a and 12b as necessary.

The rectangular ties 12a and 12b are used to bend long iron bars,
It is formed by connecting short iron bars. Strap 12
Welding, welding,
Use conventional connection methods such as mechanical joints and lap joints.

In addition, the main reinforcements 11a, llb, llc and the tie reinforcements 12a,
In addition to regular reinforcing bars, the material for 12b is P.
C steel rods, high tensile strength fibers, and combinations thereof can also be used.

The basic type shown in Fig. 3 is the main reinforcement 11a, ll shown in Fig. 2.
Instead of the iron bar for ordinary reinforcing bars in b, L-shaped steel lid, l
It uses ie. In addition to L-shaped steel, T-shaped steel, H-shaped steel, channel steel, etc. can also be used.

The basic mold shown in FIG. 4 is composed of first straps 12a and second straps 12b in a plan view of the central rectangular portion R near the inner corner of the L-shape of the basic mold shown in FIG. A main reinforcement 11f is added to the inner corner of the intersection 13.

The basic mold shown in FIG. 5 has a reinforcing bar 11g that is effective against axial force in the center of the rectangular part surrounded by the ties 12a and 12b of the central rectangular part R of the basic mold shown in FIG. , extending in the longitudinal direction of the column. 11g reinforcing bar
As the material, H-section steel, T-section steel, H-section steel, channel steel, PC steel bar, high-tensile fiber, etc. can be used.

The basic mold shown in FIG. 6 is created by assuming a rectangle smaller than this rectangle in the rectangular portion surrounded by the ties 12a and 12b of the central rectangular portion R of the basic mold shown in FIG. An L-shaped steel 11h, which is effective against axial force, is placed at the corner of the column so as to extend in the longitudinal direction of the column. L-shaped steel 1
Instead of 1h, T-shaped steel, H-shaped steel, channel steel, PC steel bar,
High tensile strength fibers can also be used.

In the basic type shown in FIGS. 2 to 6, the ties 12a, 1
As shown in FIG. 7, the reinforcing bars 2b are arranged at intervals in the longitudinal direction of the column around the main reinforcements 11a, llb, llc, etc. extending in the longitudinal direction of the column.

However, the straps 12a and 12b may be arranged in an overlapping manner.

The basic model shown in FIG. 8 has an upper protrusion S1 of an L-shaped column.
This type is adopted when it is desired to intensively reinforce the lateral protrusion S2 and the central rectangular part R from the outer corner of the L-shape, and the upper protrusion S1 and the lateral protrusion S2 are The main reinforcements 11a, llb, llc, lli are placed at the corners of the rectangle, etc.
are arranged, and reinforcing bars 12c made of rectangular iron bars or the like are arranged around these main reinforcing bars.

The basic type shown in Figure 8 is rarely used alone;
It is used in combination with the basic model shown in FIGS. 2 to 6.

The basic types shown in FIGS. 2 to 6 and 8 may be used in combination. The applied type shown in FIG. 9 is a combination of the basic type shown in FIG. 2 and the basic type shown in FIG. As shown in FIG. 10, in this applied type, the first stirrup 12a and the second stirrup 12b are arranged at intervals in the longitudinal direction of the column, and the stirrup 12a and the stirrup 12b are arranged at intervals. A tie bar 12c is arranged between them.

The basic type shown in Figures 11 and 12 is used in the adoption of the basic type shown in Figures 2 to 6 to increase the binding integrity of concrete when high axial force is applied. It has diagonal reinforcing bars inside. 11th
The type shown in the figure is an application of the basic type shown in Figure 4, and each main reinforcement 1
Reinforcing bars 14a and 14b are arranged so as to connect the reinforcing bars 1a and llb, and the bent portions of the ends of the reinforcing bars 14a and 14b are connected to the main bar 11.
This is an example of multiplying a and llb.

The mold shown in FIG. 12 is an application of the basic mold shown in FIG. ,l
The reinforcing bars 14c, 14c are arranged so as to connect the reinforcing bars 14c, 14c, and if necessary, the bent portions of the reinforcing bars 14c, 14c are connected to each main bar 11.
This is an example of multiplying a, llb, and 11f. Reinforcement bars 14a,
14b and 14c are arranged at intervals in the longitudinal direction of the column.

The mold shown in FIGS. 13 and 14 is a modification of the mold shown in FIG. 9, and is used when the L-shaped upper protrusion and lateral protrusion are made longer. In such a case, when a high axial force is applied and a large bending stress is applied, a large compressive force is applied to the upper side of the cross-shaped column and the portions 15 from the ends of the lateral protrusions S1 and S2. Reinforcement is required to intensively restrain the concrete in those portions 15.

In order to strongly restrain this portion 15, grid reinforcing bars as shown in FIGS. 15 to 17 are used as ties.

The welding grid 12d shown in FIG. 15 consists of two long iron bars 12.
The end of d1 and the ends of two short iron bars 12d2 are connected by welding to form a rectangular shape, and the end of one connecting iron rod 12d is connected by welding to a portion of the rectangular shape closer to one end. It is. The lattice reinforcing bars shown in FIGS. 16(A) and 16(B) are long rectangular bars 12 formed by bending iron bars.
e-work and short rectangular ties 12e2 formed by bending iron bars
and are combined in a lattice pattern. Figure 17 (A
The lattice-shaped reinforcing bars shown in ) and (B) are made into a lattice shape by hooking the hooks at the ends of short connecting reinforcing bars 12f2 to the end portions of long rectangular ties 12f1 formed by bending iron bars. It is.

The applied type shown in FIG. 13 has a main reinforcement 11a on the upper protrusion S1.
, llc, lli are arranged, and the main reinforcement 11 is placed on the side protrusion S2.
b, llc, lli are arranged, and main reinforcement 1 is placed in the central rectangular part R.
1a, llb, and llf are arranged, and a large number of welding grids 12d are hung at intervals in the longitudinal direction of these main reinforcements.

The type shown in Fig. 14 is the main bar 11 of the applied type shown in Fig. 13.
The rectangular part surrounded by a, llc, and lli, and the main reinforcement 11
In the rectangular portion surrounded by b, llc, and lli, reinforcing reinforcing bars 11g, which are effective against axial force, are arranged to extend in the longitudinal direction of the column.

As the reinforcing bars 11g, for example, ordinary reinforcing bars, PC copper rods, steel pipes, square steel, L-shaped steel, T-shaped steel, H-shaped steel, channel steel, high-tensile fibers, etc. are used.

Further variations of the RC column are shown in FIGS. 18 and 19. FIG. 18 shows the straps 12a of the upper protrusion S1.
A large number of main reinforcements 11j are arranged on a virtual circle in the part from the end of the part surrounded by and the part from the end of the part surrounded by the straps 12b of the lateral protrusion S2, and the straps around them. 12k are arranged to extend in the longitudinal direction of the column. In FIG. 19, instead of the brush-shaped reinforcing bars 16 in FIG. 18, a rod-shaped body 17 made of reinforced concrete and formed by burying reinforcing bars is provided.

Next, an embodiment of the SRC column of the present invention will be described using FIGS. 20 to 24.

The L-shaped shape of the pillar 20 is the L-shaped shape of the L-shaped RC pillar example.
Same as glyph. The column steel frame 2OA is an L-shaped steel frame 2OA with a T-shaped steel web welded to the side of one flange of an H-shaped steel.

In the basic type shown in FIG. 20, the arrangement of the main reinforcements 21a and 21b is the same as the arrangement of the main reinforcements 11a and llb in FIG.
, 12b.

The differences from the one in Figure 2 are that an L-shaped steel frame 20A with through holes for passing the stirrups 22a and 22b is used, that the stirrups 22a and 22b are divided into at least two parts, and that the L-shaped steel frame 20A is used. This is the relationship between the steel frame 20A and the tie bars 22a and 22b.

Web 20AI, 20A1 as L-shaped steel frame 2OA
The ties 22a are spaced apart in the longitudinal direction.

A through-hole 20A1a is used to pass the thread 22b, and as the straps 22a and 22b, at least two parts 22a□ and 22a2.22b1.22b2 are used.

Then, one part 22a□, 2 of the ties 22a, 22b
2b□(7) Pass the end through each through hole 20A1a, 20A2a of each web 20A1.20A2, and connect the end to the end of the other portion 22a2.22b2 of the straps 22a, 22b using the coupling means 18. Connected and integrated stirrups 22a, 22
b.

The basic type shown in Figure 21 is the main bar 2 of a normal reinforcing bar.
In place of 1a and 21b, L-shaped #21d and 21e are used. Note that instead of this L-shaped steel, T-shaped steel, H-shaped steel, channel steel, etc. can also be used.

The basic mold shown in FIG. 22 has a main reinforcement 21f inside the intersection 23 near the inside corner of the L-shape of the straps 22a and 22b in plan view of the central rectangular portion R of the basic mold shown in FIG. is added.

In the basic type shown in Figure 23, the main reinforcement and tie reinforcements are arranged in the first place.
Almost the same as that of the L-shaped R'C column shown in Figure 3, the 20th
This is an applied type of the basic type shown in the figure, and is an L-shaped SRC pillar 20.
This type is used when it is desired to intensively reinforce the upper and lateral protrusions of the. A small rectangle is assumed in the portion from the ends of the upper protrusion and the side protrusion, and main reinforcements 21a to 21c, 21i are arranged at the corners of the rectangle, and a rectangular reinforcing band is placed around these main reinforcements. A strip 22c is provided. The reinforcing strip 22c is, for example, divided into at least two parts, and one end of the divided reinforcing strip 12c is inserted into each through hole 20A1b, 2OA of each web 20A1.20A2.
2b, and its end is connected to the other end by the connecting means 18.

Note that the tie bars 22a and 22b are arranged in the same manner as in FIG. 20.

The basic model shown in Fig. 24 is an applied version of the basic model shown in Fig. 22. In order to increase the restraint integrity of concrete when high axial force is applied, diagonal reinforcing bars are installed inside the SRC column.
4.

As the reinforcing bar 24, for example, a dog-shaped reinforcing bar 24 having a hook 24a at one end and a straight portion 24b at the other end is used.The hook 24a is hung on the main reinforcements 21a and 21f, and the straight portion 24b is attached to the web 20A1 of the steel frame 20A2. Place it along the following lines. The straight portion 24b is welded to each web 20A1 as necessary.

As the coupling means 18, welding, joints, wire binding, etc. are used.

In addition, also in the basic type shown in FIGS. 20 to 24, the main reinforcements 21a, 21b and the main reinforcements 21a,
The inside of the straps 22a and 22b between 21b and the strap 2
An appropriate number of main reinforcements are arranged inside the ties 22a and 22b between the intersection 23 of the ties 2a and the ties 22b and the main reinforcements 21a and 21b.

Effects of the Invention The RC column of the present invention has main reinforcing bars arranged near the outer corners of the L-shaped upper protrusion and lateral protrusion, and Main reinforcements are arranged near the sides of the central rectangular part, facing the main reinforcements arranged in the upper protrusion part and the side protrusion part, respectively, and the main reinforcements arranged in the upper protrusion part and the central rectangular part. A first tie reinforcement is placed around the main reinforcement, and a second tie reinforcement is placed around the main reinforcement placed in the lateral protrusion and the central rectangular part, so a large shearing force is applied. This prevents buckling of the main reinforcing bars and prevents concrete from protruding without causing cracks.

When reinforcing bars are installed around the main reinforcement placed at the rectangular corners of the upper and side protrusions of the L-shaped RC column in plan view, the concrete at each protrusion is intensively restrained. If the reinforcing bars are arranged obliquely in the cross section of the L-shaped RC column, the restraint integrity of the concrete can be further increased.

In addition, the SRC column of the present invention has main reinforcements arranged near the outer corners of the L-shaped upper protrusion and the lateral protrusion, respectively, and the central reinforcement on the side opposite to the upper protrusion and the lateral protrusion. Main reinforcing bars are arranged near the sides of the shaped part, facing the main reinforcing bars arranged in the upper protruding part and the lateral protruding part, respectively, and L
A through hole is drilled in each web of the steel frame in the shape of a letter, and a first band reinforcement is passed through the through hole around the main reinforcement arranged in the upper protruding part and the main reinforcement arranged in the central rectangular part opposite thereto. around the main reinforcement arranged in the side protrusion and the main reinforcement arranged in the central rectangular part opposite thereto,
Since the second tie reinforcement is disposed through the through hole, cracks do not occur even when a large shearing force is applied, and concrete protrusion can be completely prevented.

A main reinforcing bar is provided at each corner of a rectangle in plan view within the L-shaped upper protrusion and lateral protrusion of the SRC column,
By placing rectangular reinforcing bars around these main reinforcements through through holes drilled in each web of the L-shaped steel frame, it is possible to intensively restrain the concrete at each protrusion, and the L-shaped The main reinforcements are arranged at the corners of the lateral protrusion side or the upper protrusion side of the rectangle surrounded by the first stirrup and the second stirrup in a plan view of the central rectangular part of the SRC column, and the L-shape is formed. Placing reinforcing bars diagonally between the sides of the steel web and each main bar at the corners further increases the restraining integrity of the concrete and can withstand high axial forces.

[Brief explanation of drawings]

Figures 1 to 19 show an example of an L-shaped RC column. Figure 1 is a plan view showing the cross-sectional shape of the column, and Figures 2 to 6 are basic reinforcement and tie reinforcement arrangements. top view of the mold,
Figure 7 is an elevational view of the main reinforcements and stirrups in Figure 2, Figure 8 is a plan view of the basic arrangement of main reinforcements and stirrups, and Figure 9 is a plan view of an applied version of the arrangement of main reinforcements and stirrups. , Fig. 10 is an elevational view of the main bars and tie bars in Fig. 9, Figs. 11 and 12 are plan views of the basic layout of the main bars, ties, and reinforcing bars, and Fig. 13
Fig. 14 is a plan view of another applied type, Fig. 15 is a plan view of a welded lattice, Fig. 16 (A) and (B) is a plan view of a rectangular reinforcing bar for making lattice bars, Fig. 17 (A) and (
B) is a plan view of rectangular reinforcing bars and connecting reinforcing bars that make up lattice ties;
Figures 18 and 19 are plan views of other applied types;
Figures 24 to 24 show a steel frame of an example of an L-shaped SRC column.
A plan view of the basic type of arrangement of main bars and tie bars, etc., Figure 25 is a schematic plan view of a building using L-shaped RC columns or SRC columns, and Figures 26 and 27 are of conventional RC columns. FIGS. 28 and 29 are plan views of the arrangement of main reinforcements and tie bars of a conventional SRC column. In the figure, 10 is an RC column, lla to llc, 11f, 1
1i, 21a to 21c, 21f and 21i are main reinforcements, 11g is reinforcing bars, llb is L-shaped steel, 12a, 12b, 2
2a and 22b are stirrups, 12c and 22c are reinforcing stirrups, 13 and 23 are intersections, 14a, 14b, 140
and 24 are reinforcing bars, 16 are brush-like reinforcing bars, 17 are bars made of reinforced concrete, 18 are coupling means, and 20 are SRCs.
Column, 20A is L-shaped steel frame, 20A1a, 2 OA 2
a, 20A1b and 20A2b are through holes, R is a central rectangular portion, Sl is an upper protrusion, and S2 is a lateral protrusion. 135'; Figure 13 Figure 15 Figure 20 Figure 14 Figure 1 d 2 a Figure 18 Figure 19

Claims (1)

[Claims] 1. RC of an L-shaped cross section, including main reinforcement and tie reinforcement, and consisting of a central rectangular portion, a rectangular upper protruding portion and a lateral protruding portion protruding from the central rectangular portion. In the column, a main reinforcement is arranged near the outer corner of each protrusion, and a main reinforcement is provided near the side of the central rectangular part on the opposite side from the upper protrusion and the lateral protrusion. Main reinforcing bars are arranged opposite to the main reinforcing bars arranged in the protrusion, and first tie reinforcements are arranged around the main reinforcing bars arranged in the upper protruding part and the central rectangular part, and L, characterized in that second reinforcements are arranged around the main reinforcements arranged in the central rectangular part and the central rectangular part.
RC column with letter-shaped cross section. 2. The main reinforcement is arranged at the inner corner of the intersection of the first stirrup and the second stirrup in plan view of the central rectangular part near the inner corner of the L-shape. An RC column with an L-shaped cross section according to claim 1. 3. A reinforcing bar that is effective against axial force is installed in the longitudinal direction of the column at or near the center of the square part surrounded by the first stirrup and the second stirrup in a plan view of the central rectangular part. The RC column with an L-shaped cross section according to claim 1 or 2, characterized in that the RC column is arranged in an extended manner. 4. A main reinforcement is provided at each corner of the quadrilateral in a plan view of the central rectangular portion from the upper protrusion, the lateral protrusion, or the outer corner of the L-shape; 4. The RC column having an L-shaped cross section according to claim 1, wherein reinforcing bars are arranged around each main reinforcing bar. 5. Main reinforcements are provided at each corner of the rectangle in plan view in the upper protrusion part and the lateral protrusion part, and reinforcing strips are provided around each main reinforcement provided at each corner of the rectangle, 5. The RC column with an L-shaped cross section according to claim 4, wherein reinforcing bars are provided extending in the longitudinal direction of the column within a portion surrounded by the reinforcing bars. 6. The RC column with an L-shaped cross section according to claim 4 or 5, wherein the first stirrup and reinforcing stirrups and the second stirrup and reinforcing stirrups are composed of lattice reinforcing bars. . 7. Any one of claims 1 to 6, wherein reinforcing bars are arranged in the L-shaped RC column so as to be inclined with respect to the vertical or horizontal center line of the central rectangular part. RC column with an L-shaped cross section as described in Section 1. 8. An SRC column with an L-shaped cross section, including an L-shaped steel frame, main reinforcement, and tie reinforcement, and consisting of a central rectangular part, a rectangular upper protruding part, and a rectangular side protruding part that protrude from the central rectangular part. , a main reinforcement is provided near the outer corner of each protrusion, and a main reinforcement is provided near the side of the central rectangular part on the opposite side from the upper protrusion and the lateral protrusion. Main reinforcing bars are arranged opposite to the main reinforcing bars arranged in the upper protruding part, and through holes are made in each web of the L-shaped steel frame, and the main reinforcing bars are arranged in the upper protruding part and opposite to the main reinforcing bars in the central rectangular part. A first band reinforcement is arranged through the through hole around the main reinforcement arranged in the lateral protrusion, and the main reinforcement arranged in the central rectangular part opposite thereto. An SRC having an L-shaped cross section, characterized in that a second strap is disposed around the periphery through the through hole.
Pillar. 9. The main reinforcement is arranged at the inner corner of the intersection of the first stirrup and the second stirrup in plan view of the central rectangular part near the inner corner of the L-shape. 9. The SRC column with an L-shaped cross section as claimed in claim 8. 10. Main reinforcements are arranged at each corner of the rectangle in plan view in the upper protrusion and the side protrusion, and a hole is placed in each web of the L-shaped steel frame around the main reinforcement arranged at each corner of the rectangle. 10. The SRC column with an L-shaped cross section according to claim 8 or 9, wherein reinforcing bars are respectively disposed through the through holes. 11. Main reinforcing bars are arranged at each corner on the side protrusion side or the upper protrusion side of the quadrangular part surrounded by the first hoop line and the second hoop line in plan view of the central rectangular part. The L-shape according to any one of claims 8 to 10, characterized in that reinforcing bars are disposed diagonally between the side surfaces of the L-shaped steel web and each of the main bars at the corners. SR of the cross section of
C pillar.