JP3519331B2 - Joint structure between bundle columns and beams of seismic retrofit unit - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure between a bundled column and a beam, which constitutes a seismic reinforcement unit for seismically reinforcing a frame of a pillar or beam of an existing building or a new building.

[0002]

2. Description of the Related Art For example, in the case where a frame of a pillar or beam of an existing building is subjected to seismic reinforcement, it is conceivable to add seismic resistant elements such as braces or seismic resistant walls to the frame. When the structural earthquake-resistant wall is placed in one frame surrounded by the upper and lower beams and the columns on the left and right, the diagonal tensile force when bearing the horizontal force causes cracks in the earthquake-resistant wall, and eventually the earthquake-resistant wall is Extending to the connecting pillar occurs.

If the cracks that occur in the pillars progress further and develop into cracks that penetrate the pillars, the pillars will eventually undergo shear failure and the building will collapse, so by adding earthquake resistant walls to the frame of the existing building. In case of seismic retrofitting, it may be necessary to reinforce the columns, which complicates the construction.

Further, when the seismic wall is arranged in one frame, the opening is usually secured, so that the problem of a decrease in the yield strength occurs due to the formation of the opening, and in order to avoid the decrease in the yield strength, the area around the opening is reinforced. It becomes necessary to do so, and the construction for that becomes complicated.

From the above background, according to the present invention, a bundle column that constitutes a seismic reinforcement unit that suppresses or prevents cracking of the column and secures the opening in the frame, and does not require reinforcement around the opening , It proposes a joint structure with a beam .

[0006]

According to the present invention, a bundle column is installed between upper and lower beams at an intermediate position between the left and right columns, and at least one of the column and the bundle column and the upper and lower beams form a plurality of openings in one frame. The seismic element is a reinforced concrete seismic wall by arranging the seismic element in any of the divided openings and separating at least one of the left and right columns from the seismic element. In some cases, the cracks that occur in the earthquake-resistant wall are suppressed or prevented from extending to the pillars, and the openings around the openings are secured while the openings are secured in the frame.

The bund and seismic element are located within the frame of the frame
Then, the bundle column is sandwiched between the beam and the gusset plate joined to both side faces of the beam across the bundle column and joined to the gusset plate.

In this case, since the bundle column does not need to be directly joined to the beam, the bundle column and the beam can be easily fitted together, and the both can be easily accommodated. If the gusset plates located on both sides of the beam are pressure-bonded to the beam as described in claim 5 ,
Since the two gusset plates can be joined at the same time, the joining of the gusset plate and the beam is also simple.

In order to secure an opening in one frame, it is sufficient to dispose a seismic element in the opening defined by at least one of the column and the bundle column and the upper and lower beams. Should be installed in the. In that case, it is sufficient to reinforce the frame due to the arrangement of the seismic resistant elements to one of the columns on both sides of the frame, and to reinforce the columns on both sides due to the arrangement of the seismic resistant elements. Construction is simplified.

According to a second aspect of the present invention, the bundle columns are installed at a plurality of intermediate positions between the left and right columns, and the seismic element is placed in the opening defined by the adjacent column and the upper and lower beams. In this case, the columns on both sides are completely separated from the seismic resistant elements, and the extension of cracks that have occurred on the seismic resistant walls do not reach the columns on both sides.Therefore, it is not necessary to reinforce both columns, and the construction required for the seismic resistant element placement Is further simplified.

In any of the first and second aspects, at least one of a bundle column and a column that is erected between the upper and lower beams, and the upper and lower beams define an opening, and the boundary between the seismic element and the opening is defined. The location of the bund post constrains the seismic element and increases the toughness and strength of the seismic element.Therefore, there is no problem of the seismic element's withdrawal of strength due to the formation of openings.
There is no need to reinforce the seismic element adjacent to the opening.

According to claim 3, when the seismic resistant element is an earthquake resistant wall,
By filling the filling material between the perimeter of the seismic element and the upper and lower beams, columns or bundle columns, and joining the entire circumference of the earthquake resistant wall to the upper and lower beams and bundle columns, etc. The toughness and proof stress of the earthquake resistant wall are controlled by adjusting the structural performance of the bundle columns while increasing the restraining effect of the earthquake resistant wall. In this case, by controlling the toughness and proof stress of the earthquake-resistant wall, it becomes possible to delay the timing of crack occurrence or suppress the occurrence of crack itself.

When filling the periphery of the seismic element with a filling material, at least one of the upper and lower ends of the seismic element and the beam, or the left and right ends and the pillar of the seismic element may be provided as required. Alternatively, the anchor is fixed to at least one of the bundle columns.

Since the bundle column is installed between the upper and lower beams, it functions to transfer the vertical load that the upper beam should bear to the lower beam, so that the upper beam causes bending or shear failure, It also works to prevent the building from collapsing if it loses its load bearing capacity.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION The seismic retrofit unit 1 used in the present invention is a building composed of a frame of columns and beams, and is located between the upper and lower beams 5 and 5 at an intermediate position between the left and right columns 4 and 4. It is composed of a bundle pillar 2 that is vertically installed, at least one of the pillar 4 and the bundle pillar 2, and a seismic resistant element 3 that is arranged in an opening defined by the upper and lower beams 5 and 5. Seismic reinforcement unit
1 is placed in the frame of the frame.

Regardless of whether the frame of the pillar / beam in which the seismic reinforcement unit 1 is incorporated is an existing building or a new building, the frame structure is steel frame, reinforced concrete,
It does not matter whether the structure is steel reinforced concrete.
In the case of reinforced concrete construction or steel reinforced concrete construction, it may be composed of precast members, and prestress is introduced in the axial direction of the beams 5 and columns 4 or the axial directions of the beams 5 and columns 4 that make up the frame. In some cases.

According to the present invention, when the seismic resistant element 3 is a reinforced concrete seismic resistant wall, a cracked column 4 generated in the seismic resistant wall 4
The purpose of this is to prevent the extension of the frame, but the seismic element 3 is not limited to the seismic wall in terms of seismic reinforcement of the frame. Absent.

The earthquake-resistant wall is made of precast concrete, cast-in-place concrete as shown in the figure, or made of steel plate, or a composite structure of steel and concrete, or constructed. The brace may be made of steel including a steel pipe, a composite structure of steel and concrete, or precast concrete. In the case of concrete, when the tensile force is also resisted, prestress is given in the axial direction.

When concrete is used for the earthquake-resistant wall, ultra-light concrete is used as well as ordinary concrete and other concrete, and prestress is applied in at least one of the vertical direction and the horizontal direction in order to adjust the rigidity. It may be introduced.

The bundle columns 2 may be made of precast concrete, cast-in-place concrete, or steel-framed reinforced concrete, or may be a steel material or a composite structure of steel and concrete as shown in the figure. If necessary, prestress is introduced in the axial direction. It

FIG. 1 shows a case in which one bundle pillar 2 is installed between pillars 4 and 4 to divide one frame into two openings, and a seismic wall as a seismic element 3 is arranged in one opening. Show. In this case, the opening in which the seismic element 3 is not arranged can be used as a passage.

2 and 3 show two bundle columns 2 between columns 4 and 4.
2 shows the case where one frame is divided into three openings, and the earthquake resistant wall is placed in the largest opening. 2 shows the case where the seismic reinforcement unit 1 is arranged close to one of the pillars 4 side, and FIG. 3 shows the case where it is arranged in the central portion between the pillars 4 and 4.
In the case of FIG. 3, the openings on both sides of the seismic reinforcement unit 1 can be used as a passage or a window.

In addition to the structure shown in FIGS. 1 to 3, three or more bundle columns 2 are erected to divide one frame into four or more openings, and one or two or more of the openings are seismic resistant elements. 3 may be arranged.

FIGS. 1 to 3 use two H-shaped steels for the bundle columns 2 so that both ends of the seismic wall can be sandwiched from both sides in the out-of-plane direction. ，
31 shows the case of configuration. Here, the respective bar arrangements in the case where the frame is made of reinforced concrete and the wall plate 31 is made of precast concrete are shown. When sandwiching both ends of the earthquake-resistant wall, it is sufficient if the bundle pillar 2 has a concave cross-sectional shape on the earthquake-resistant wall side. Therefore, a concrete member having that shape may be used for the bundle pillar 2.

4 to 7 show the seismic retrofit unit 1 on the pillars 4,
4 shows an example of a specific arrangement of the bundle columns 2 and the beams 5 in the arrangement example shown in FIG. Tababashira 2 for placement within the Plane of the frame, having a length of only slightly shorter than the distance from the top end of the lower floor beam 5 to the lower end of the upper floors of the beam 5.

In the drawing, since the H-shaped steel is used for the bundle column 2, the upper and lower ends of the bundle column 2 are joined to both side surfaces of the beam 5, and the gusset plates 6 and 6 straddling the beam 5 and the bundle column 2 are joined. The bundle pillar 2 and the beams 5 and 5 are bonded to each other by bolts 7 or welding, and the filler 10 is filled between the bundle pillar 2 and the beam 5 to join the bundle pillar 2 to the beam 5. The joining method of is not limited to this.

When the frame is reinforced concrete,
When the gusset plate 6 is used, the gusset plate 6 is a beam 5 as shown in FIG. 6 which is a sectional view taken along line yy of FIG.
Beam 5 with a bolt or PC steel rod 8 that penetrates the
To be joined to. If the frame already exists, the through hole is formed in advance by core boring. Further, when the building is existing, as shown in the drawing, the seismic reinforcement unit 1 is installed over a plurality of layers, and when the gusset plate 6 extends above and below the beam 5, the gusset plate 6 portion of the slab 9 connected to the beam 5 is connected. Are removed and restored after joining the gusset plate 6.

[0028] In order to transmit the horizontal force acting on the frame in seismic reinforcement unit 1, the upper and lower ends of the Tababashira 2 and the beam 5
Filler 10, such as non-shrink mortar is filled in the gap between the.

In FIG. 6, the filler plate 11 is sandwiched between the flange 2a of the bundle column 2 and the gusset plate 6 so that the filling material 10 wraps around the beam 5 at the portion where the gusset plate 6 extends above and below the beam 5. A gap is formed between the side surface of the beam 5 and the gusset plate 6. An end plate 2c, which is a weir for the filler 10, is joined to the upper and lower ends of the bundle 2 together with the gusset plates 6 and 6.

In FIG. 6, when the PC steel rod 8 press-bonds the gusset plate 6 to the beam 5, the tension of the PC steel rod 8 is dispersed in the gusset plate 6 to prevent deformation of the gusset plate 6. , In order to secure a distance between both ends of the PC steel rod 8 in introducing a constant tension to the PC steel rod 8, both sides of the beam 5 are made of concrete or steel pedestals 12, 12.
Are arranged, and both ends of the PC steel rod 8 are fixed to the pedestals 12 and 12.

The end portion of the wall plate 31 located near the bundle column 2 is shown in FIG.
5 is a sectional view taken along line xx of FIG. 7 and FIG. 7 showing the details thereof.
As shown in FIG. 3, the bundle columns 2 are arranged so as to be sandwiched between the flanges 2a, 2a.

8 to 11 show four wall plates 31 between the bundle columns 2 and 2.
An example of the connection between the wall plate 31 and the bundle columns 2 and the beams 5 in the case of arranging is shown. As described above, the wall plate 31 on the bundle column 2 side is x-
Both flanges of the bundle column 2 as shown in FIG. 9 which is a sectional view taken along the line x
The space is sandwiched between 2a, 2a, and the space surrounded by the flanges 2a, 2a and the web 2b is filled with the filling material 10 to be joined to the bundle column 2.

In order that the shearing force is transmitted between the wall plate 31 and the bundle 2 through the filling material 10, the horizontal streak 3a projects from the end face of the wall plate 31 on the side of the bunch 2 and the protruding part of the horizontal streak 3a is projected. Anchorage 3b
Are welded, and the shear connector 2d is welded to the web 2b of the bundle 2. Longitudinal lines 13 are arranged in the filling material 10. web
A stiffener 2e for stiffening the flanges 2a, 2a is welded between the flanges 2a, 2a on the surface of 2b opposite to the wall plate 31.

FIG. 10 shows an example of the connection between the upper end of the wall plate 31 and the beam 5. FIG. 10 shows a cross section taken along the line yy of FIG. 8, but the connection between the lower end of the wall plate 31 and the beam 5 is similar. A space for the filling material 10 to be filled is secured between the wall plate 31 and the beam 5, so that the shear force is also transmitted between the wall plate 31 and the beam 5.
Longitudinal streaks 3c project from the upper and lower ends of 31, and anchor streaks 3d are welded to the projecting portions. Post-installed anchors and other anchors 14 and stud bolts are embedded or driven into the beam 5 from the surface on the side of the wall plate 31 and project toward the side of the wall plate 31. Transverse bars 15 are arranged in the filler 10.

FIG. 11 shows an example of joining the adjacent wall plates 31, 31. Here, the fixing streak 3e shown in FIGS. 1 to 3 and the plate 3f fixed in the concrete by the anchor streak 3g are projected from the end surface of each wall plate 31, and the plate 16 is passed between both plates 3f and 3f. The wall plates 31 and 31 are joined by welding or bolting to the 3f and 3f, and filling the filler 10 between the end faces of the wall plates 31 and 31. Also both wall boards
A metal lath 17 for reinforcing the filling material 10 is passed between the plates 3f, 3f of 31, 31, and welded to both. FIG. 11 is FIG.
The cross section of the z-z line of FIG.

FIG. 12 shows an elevation when the seismic reinforcement unit 1 is continuously installed over four layers of frames.

[0037]

EFFECTS OF THE INVENTION A bundle column is installed between upper and lower beams at an intermediate position between the left and right columns, and one frame is divided into a plurality of openings by the column and / or the bundle column and the upper and lower beams. Place a seismic element in one of the openings,
Since at least one of the left and right columns is separated from the seismic resistant element, when the seismic resistant element is an earthquake resistant wall, it is possible to suppress or prevent the cracks generated in the earthquake resistant wall from extending to the pillar.

Further joining a gusset plate extending over the beams and Tababashira on both sides of the beam, for joining the gusset plates sandwiching the bundle pillar between the two gusset plates, it is not necessary to directly bond the bundle column to the beam, It becomes easy to connect the bundle columns and beams.

In the second aspect, the bundle columns are erected at a plurality of positions in the middle portion between the left and right columns, and the seismic resistant element is arranged in the opening defined by the adjacent column and the upper and lower beams. Since the columns and the seismic resistant elements are completely separated, the extension of the cracks that have occurred on the seismic resistant walls does not extend to the columns on both sides.As a result, it is not necessary to reinforce both columns and the construction required for the seismic resistant element placement is simple. Be converted.

In the first and second aspects, the opening is defined by at least one of the bundle column and the column and the upper and lower beams.
Since the bunch column restrains the seismic element and increases its toughness and strength, the problem of the seismic element's proof stress reduction due to the formation of the opening does not occur, and it is not necessary to reinforce the seismic element adjacent to the opening. Does not happen.

According to claims 3 and 4, when the seismic resistant element is a seismic resistant wall, a filling material is filled between the perimeter of the seismic resistant element and the upper and lower beams, columns, or bundle columns. As the effect increases, the toughness and proof stress of the seismic element can be controlled by adjusting the structural performance of the bundle columns. As a result, it is possible to delay the occurrence of cracks or suppress the occurrence of cracks themselves.

Since the bundle column is installed between the upper and lower beams, it functions to transfer the vertical load, which the upper beam should bear, to the lower beam, so that the upper beam causes bending or shear failure. It is possible to prevent the building from collapsing even if the load bearing capacity is lost.

In the fifth aspect , since the gusset plates on both sides are pressure-bonded to the beam, the gusset plate and the beam can be simply bonded.

[Brief description of drawings]

FIG. 1 is an elevational view showing a case where one bundle pillar is installed between pillars.

FIG. 2 is an elevational view showing a case where two bundle columns are installed between columns.

FIG. 3 is an elevational view showing a case where two bundle columns are installed between columns.

FIG. 4 is an elevational view showing an example of joining bundle columns to beams.

5 is a sectional view taken along line xx of FIG.

6 is a cross-sectional view taken along line yy of FIG.

FIG. 7 is a partially enlarged view of FIG.

FIG. 8 is an elevation view showing an example of joining the seismic resistant element to the beam and the bundle column.

9 is a sectional view taken along line xx of FIG.

10 is a cross-sectional view taken along line yy of FIG.

11 is a sectional view taken along line zz of FIG.

FIG. 12 is an elevation view showing a case where seismic retrofit units are continuously installed in a four-story building.

[Explanation of symbols]

1 ... Seismic strengthening unit, 2 ... Bundle, 2a ... Flange, 2b ... Web, 2c ... End plate, 2d ... Shear connector, 2e ... Stiffener, 3 ... Seismic element, 31 ... Wall Plates, 3a ... Horizontal stripes, 3b ... Anchoring bars, 3c ... Vertical stripes, 3d ... Anchoring bars, 3e ... Anchoring bars, 3f ... Plates, 3g ... Anchor bars, 4 ... Pillars, 5 ... Beam, 6 ... Gusset plate, 7
…… Bolt, 8 …… PC steel rod, 9 …… Slab, 10 …… Filling material, 11 …… Filler plate, 12 …… Pedestal, 13 …… Vertical streak, 14 …… Anchor, 15 …… Horizontal streak, 16 ...... Plate, 17
…… Metal Lath.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI E04G 23/02 E04G 23/02 D E04H 9/02 321 E04H 9/02 321E 321H (72) Inventor Toru Masuyama Nishi, Chiyoda-ku, Tokyo 3-8-1 Kanda 3-8-1 Taihei Yoyo Cement Co., Ltd. (56) References Japanese Patent Publication No. 63-56373 (JP, B1) Actual Publication No. 54-7620 (JP, Y1) (58) Fields investigated (Int.Cl. ⁷ , DB name) E04B 2/56 E04B 1/58 E04G 23/02 E04H 9/02

Claims (5)

(57) [Claims] 1. A frame consists of upper and lower beams left and right columns, and beam pillars are laid down Harima at an intermediate portion located between the left and right columns, and at least one pillar and Tababashira, vertical a joint structure between the beam column and the beam constituting the seismic reinforcement unit comprising a beam from the seismic elements disposed in an opening which is defined by, across the beam and Tababashira on both sides of the beam A structure in which a gusset plate is joined and the bundle column is sandwiched between both gusset plates and joined to the gusset plate. 2. The bundle columns are erected at a plurality of intermediate positions between the left and right columns, and the seismic resistant element is arranged in an opening defined by adjacent bundle columns and upper and lower beams. Structure of bundle columns and beams of the seismic retrofit unit in Japan . 3. The seismic reinforcement according to claim 1 or 2, wherein the seismic resistant element is a seismic resistant wall, and a filling material is filled between the periphery of the seismic resistant element and upper and lower beams, columns, or bundle columns. The joint structure between the bundle columns and beams of the unit . 4. The seismic resistance according to claim 3, wherein anchors are fixed to at least one of the upper and lower ends of the seismic resistant element and the beam, or to the left and right ends of the seismic resistant element and the pillar, or at least one of the bundle pillars. Joint between bundle column and beam of reinforcement unit
Structure . 5. The joint structure between a bundle column and a beam of the seismic reinforcement unit according to claim 1, wherein both gusset plates are pressure-bonded to the beam .