JP6408786B2 - Floor beam and floor beam support structure - Google Patents

Description

  The present invention relates to a floor beam having flanges bonded to the top and bottom of a web, and a floor beam support structure for supporting the floor beam to a building frame.

H-beams are used as floor beams. The H-shaped steel has a shape in which flanges are joined to the top and bottom of the web, and the beam ends are supported on the building frame via brackets.
As a support structure for a floor beam made of H-shaped steel, a rib that receives the lower surface of the beam end is joined to the lower end of a plate-like support, the side of the support faces the side of the foundation, and the upper end of the support Is attached to a fixed plate, and there is a mounting bracket in which the fixed plate is fixed to a side surface of a column (Patent Document 1).

Japanese Utility Model Publication No. 63-177505

In the conventional example shown by patent document 1, a mounting bracket is a structure which supports the lower surface of the beam end part of H-section steel. And the H-section steel utilized as a floor beam is made into the same beam formation from the one end part to the other end part.
The higher the strength of the floor beam, the better. In the floor beam made of H-shaped steel, it is necessary to lengthen the beam formation in order to increase the strength.

If the beam length of the floor beam is increased, the height of the floor surface is increased and the living room space is narrowed, or the lower edge of the floor beam is lowered and the underfloor space is narrowed. Since it is not preferable that the living room space is narrow, the space under the floor must be narrow.
However, in various work after floor construction and underfloor maintenance work after building construction, an operator must sink under the floor. Therefore, if the underfloor space is small, the work becomes difficult.

  An object of the present invention is to provide a floor beam and a floor beam support structure capable of securing an underfloor space for work.

Referring to the drawings, the floor beam 1 of the present invention includes a web 11, an upper flange 12 joined to the upper edge of the web, and a lower flange 13 joined to the lower edge of the web. height from the upper flange to the lower flange, the beam central portion 1B from the beam central beam-part 1A positioned on both longitudinal ends of rather low, at least one of said upper flange and said lower flange thickness The beam dimension is characterized in that the beam end is thicker than the beam center .

In the present invention, since the height of the beam end is lower than the center of the beam in the present invention, the height dimension under the floor is larger at the beam end than at the center of the beam. Therefore, the underfloor space under the beam end becomes wide, and the underfloor work after the floor is constructed or the underfloor maintenance work after the building construction is facilitated. Since the beam end is close to the building frame such as the foundation, there are many work items in the work area. Therefore, the ability to maintain the under-floor space at the beam end is convenient for working in the area.
Furthermore, in the present invention, the beam formation is short at the end portion of the beam and not at the center portion of the beam, so that the strength of the entire floor beam does not decrease. That is, when the floor beam is bent under a load, the amount of bending is larger at the beam center than at the beam end. In the present invention, even if the beam formation at the beam end portion is shortened, the strength of the entire floor beam can be maintained by making the beam formation at the center portion of the beam at least the same as the conventional one. Even if the strength of the entire floor beam is reduced by the shortening of the beam formation at the beam end, the strength of the floor beam can be increased by making the beam formation at the center of the beam longer than before. Even if the space under the floor becomes narrow by increasing the beam formation at the center of the beam, there is little work in that area, so there is little work inconvenience.

Moreover, in this configuration, at least one of the upper flange portion and the lower flange portion has a beam end portion thicker than the beam center portion, so that the beam strength at the beam end portion with a short beam formation can be increased.

It is preferable that a stiffener 15 (151, 152, 153) is provided at the beam end so as to intersect the web between the upper flange and the lower flange.
In this configuration, by providing the stiffener, it is possible to increase the beam strength at the beam end portion where the beam formation is short.

It is preferable that a reinforcing plate 6 (61, 62) is provided at the beam end portion in parallel with the web between the upper flange and the lower flange, respectively.
In this configuration, by providing the reinforcing plate, it is possible to increase the beam strength at the beam end portion where the beam formation is short.

The reinforcing plate 61 is preferably joined to the web.
In this configuration, the reinforcing plate is joined to the web, whereby the thickness of the entire web is increased, so that a great reinforcing effect can be obtained.

Preferably, the reinforcing plate 62 is disposed away from the web, the upper edge of the reinforcing plate is joined to the lower surface of the upper flange, and the lower edge of the reinforcing plate is joined to the upper surface of the lower flange. .
In this configuration, the reinforcing plate is separated from the web and joined to the upper flange and the lower flange, thereby preventing the upper flange and the lower flange from being deformed by a large load.

The floor beam support structure of the present invention includes a web, an upper flange joined to the upper edge of the web, and a lower flange joined to the lower edge of the web, and has a height from the upper flange to the lower flange. The bracket 3 is a structure for supporting a floor beam having a beam end portion located on both sides in the longitudinal direction of the beam center portion lower than the beam center portion and receiving the beam end portion and attached to the building frame A. And a joining member 4 that joins the bracket and the beam end, and the bracket is provided on both sides of the bottom surface portion 32A for supporting the lower flange of the beam end portion and the web. possess a side surface portion 32B opposed to the joining member, the Na with inserting a nut 41 which is previously bonded to the lower flange, the long hole 320 formed in the longitudinal direction of the bottom portion Characterized by comprising a bolt 42 to be screwed in and.
In the present invention, the bracket is positioned in the lower side and the left-right direction of the beam end portion of the floor beam, so that the floor beam can be properly attached to the bracket.

In addition, in this configuration, since the long hole is formed in the bottom surface portion, even if the position of the bracket and the floor beam in the longitudinal direction of the floor beam is shifted, the floor beam can be easily joined to the bracket with a bolt and a nut. it can.

The front view of the floor beam support structure concerning 1st Embodiment of this invention. The top view of a floor beam. The front view of a floor beam. The end view of a floor beam. The front view which shows the principal part of a floor beam. The front view which shows the principal part of a floor beam support structure. The top view of a bracket. The front view of a bracket. Sectional drawing of a bracket. The top view of a washer board. (A)-(D) are schematic which shows the procedure which manufactures a floor beam. The front view which shows the principal part of the floor beam of 2nd Embodiment of this invention. FIG. 13 is a cross-sectional view taken along line AA in FIG. The front view which shows the principal part of the floor beam of 3rd Embodiment of this invention. FIG. 15 is a cross-sectional view taken along line AA in FIG. 14. The front view which shows the principal part of the floor beam of 4th Embodiment of this invention. FIG. 17 is a cross-sectional view taken along line AA in FIG. 16. The front view which shows the principal part of the floor beam of 5th Embodiment of this invention. FIG. 19 is a cross-sectional view taken along line AA in FIG. 18.

Embodiments of the present invention will be described with reference to the drawings. Here, in description of each embodiment, the same component is attached | subjected with the same code | symbol and description is abbreviate | omitted.
1 to 11 show a first embodiment.
In FIG. 1 showing the overall configuration, the first embodiment includes a steel floor beam 1 and a floor beam support structure 2 for supporting a beam end 1A of the floor beam 1 on a building frame A.
In the present embodiment, the building frame A can be exemplified by a foundation, a foundation, a large pull, and the like, for example. The floor beam 1 is not limited to the floor beam on the first floor portion, and may be a floor beam installed on the second floor or more.

A specific structure of the floor beam 1 will be described with reference to FIGS.
2 to 5, the floor beam 1 includes a web 11, an upper flange 12 joined to the upper edge of the web 11, a lower flange 13 joined to the lower edge of the web 11, and an end face of the beam end 1A. And an end plate portion 14 that covers the upper flange 12 and the lower flange 13.
The upper flange 12 has the same thickness dimension along the longitudinal direction of the web 11.

The beam end 1 </ b> A of the web 11 is formed by notching the lower end. The length (beam formation) from the upper flange 12 to the lower flange 13 of the floor beam 1 is lower at the beam end portions 1A located on both sides in the longitudinal direction than at the beam center portion 1B.
The lower flange 13 positioned at the beam end portion 1A includes a joining piece portion 13A arranged in parallel with the upper flange 12, and an inclined piece portion integrally formed with the joining piece portion 13A and having an end portion connected to the beam center portion 1B. 13B. The obtuse angle θ among the angles of the joining piece portion 13A to the inclined piece portion 13B is appropriately set, and is, for example, 90 ° to 150 °, and in this embodiment, 120 °. In FIG. 5, the thickness dimension ta of the joining piece part 13 </ b> A and the inclined piece part 13 </ b> B is larger than the thickness dimension t of the upper flange 12. In the present embodiment, the thicknesses of the upper flange 12 and the lower flange 13 can be appropriately set. When the upper flange 12 is designed to be thick, the thicknesses of the upper flange 12 and the lower flange 13 are set to be different. It may be equal.

The lower flange 13 located at the beam central portion 1B includes a bottom piece 13C arranged in parallel with the upper flange 12, and the thickness tb of the bottom piece 13C is the same as the thickness t of the upper flange 12. It is. The end of the bottom piece 13C and the end of the inclined piece 13B are abutted.
The end plate part 14 is joined to the end edge part of the joining piece part 13 </ b> A and the upper flange 12. The thickness dimension te of the end plate part 14 is the same as the thickness dimension ta of the joining piece part 13A and the inclined piece part 13B.
The upper flange 12, the lower flange 13, and the end plate portion 14 have the same width dimension (see FIGS. 2 and 4). In the present embodiment, the width dimensions of the upper flange 12, the lower flange 13, and the end plate portion 14 may be changed. For example, the width dimension of the upper flange 12 is changed from the width dimensions of the lower flange 13 and the end plate portion 14. May be larger.
The web 11 is located at the center in the width direction (direction perpendicular to the longitudinal direction) of the upper flange 12, the lower flange 13 and the end plate portion 14.

Here, the length and beam formation of the floor beam 1 are determined by the dimension between adjacent building frames A, the width dimension of the building frame A, and other conditions. For example, the total length of the floor beam 1 is It is about 1400 mm to 5200 mm. The length of the beam end portion 1A is about 450 mm to 520 mm, the length of the beam center portion is about 600 mm to 4000 mm, and the length of the joining piece portion 13A is about 420 mm.
The beam formation of the beam center portion 1B is about 100 mm to 350 mm, and the beam formation in the region of the joining piece portion 13A in the beam end portion 1A is about 90 mm to 120 mm.
The ratio of the thickness dimension of the joining piece part 13A, the inclined piece part 13B and the end plate part 14 to the thickness dimension of the upper flange 12 and the bottom piece part 13C is appropriately set, but is about 1.2 to 2.0 times. It is. For example, the thickness dimension of the joining piece part 13A, the inclined piece part 13B and the end plate part 14 can be 6 mm, and the thickness dimension of the upper flange 12 and the bottom piece part 13C can be 4.5 mm.

The stiffener 15 has a lower end edge joined to a connection portion between the first stiffener 151 where the lower end edge is joined to the abutting place between the bottom piece 13C and the inclined piece part 13B, and the inclined piece part 13B and the joined piece part 13A. A second stiffener 152 and two third stiffeners 153 each having a lower end edge joined to the joining piece portion 13A are provided. Upper ends of the first stiffener 151, the second stiffener 152, and the third stiffener 153 are joined so as to be perpendicular to the upper flange 12.
The first stiffener 151 is a pair of two sandwiching the web 11. Similarly, the second stiffener 152 is paired with two webs 11 sandwiched therebetween, and the third stiffener 153 is paired with two webs 11 sandwiched between webs 11. Side edges of the first stiffener 151, the second stiffener 152, and the third stiffener 153 facing the web 11 are joined to the web 11, respectively.
The stiffener 15 has the same thickness as the upper flange 12.

The principal part of the floor beam support structure 2 is shown by FIG.
In FIG. 6, the floor beam support structure 2 includes a bracket 3 that receives a part of the beam end 1A and is attached to the building housing A, and a joining member 4 that joins the bracket 3 and the beam end 1A. Yes.
The joining member 4 includes a nut 41 that is joined in advance to the joining piece portion 13 </ b> A of the lower flange 13, and a bolt 42 that is screwed into the nut 41. A bolt insertion hole 130 is formed at a position corresponding to the nut 41 in the joining piece portion 13A.
A washer plate 5 is interposed between the bolt 42 and the nut 41.
Two nuts 41 are arranged in a region sandwiched between two third stiffeners 153 in the joining piece portion 13A. Since these nuts 41 are arranged opposite to each other with the web 11 interposed therebetween, four nuts 41 are arranged per one beam end 1A (see FIG. 2).

The bracket 3 includes an attachment piece portion 31 attached to the building case A and a main body portion 32 joined to the attachment piece portion 31.
The detailed structure of the bracket 3 is shown in FIGS.
7 to 9, the attachment piece portion 31 includes a flat plate portion 311 that contacts the side surface of the building housing A, and a locking piece portion 312 that is joined to the upper end edge of the flat plate portion 311 and is locked to the upper surface of the building housing A. And have.
The flat plate portion 311 and the locking piece portion 312 are formed by bending a single metal plate by press molding or the like. At the time of forming, the connecting portion between the flat plate portion 311 and the locking piece portion 312 is A plurality of reinforcing ribs 313 are integrally formed. The reinforcing rib 313 is formed in a concave portion formed in a portion where the flat plate portion 311 and the locking piece portion 312 are perpendicular to each other when the metal plate is bent by press molding or the like, and an outer portion corresponding to the concave portion. It is comprised from a convex part.
The flat plate portion 311 is formed with a plurality of mounting holes 31A for mounting the bracket 3 to the building frame A with mounting tools (not shown) such as bolts.

The main body portion 32 includes a bottom surface portion 32A that supports the joining piece portion 13A of the beam end portion 1A, a side surface portion 32B that is provided on both sides of the bottom surface portion 32A and faces the web 11, and is directed outward from the upper end of the side surface portion 32B. And a collar portion 32C extended.
A long hole 320 through which the bolt 42 is inserted along the longitudinal direction of the floor beam 1 is formed in the bottom surface portion 32A.
The flange portion 32 </ b> C can receive the outer lower end of the upper flange 12 when the width dimension of the upper flange 12 is larger than the width dimension of the lower flange 13 and the end plate part 14.

One long hole 320 is for inserting bolts 42 corresponding to the two nuts 41 arranged along the longitudinal direction of the floor beam 1, and the nuts 41 are arranged in two rows with the web 11 interposed therebetween. Therefore, two slots 320 are formed.
The dimension between the side parts 32B facing each other is the same as or slightly larger than the horizontal dimension of the beam end part 1A.
The structure of the washer plate 5 is shown in FIG.
In FIG. 10, the washer plate 5 has a structure in which four bolt insertion holes 5A are formed in a flat rectangular plate. In the present embodiment, since the single washer plate 5 is used when the four bolts 42 are screwed into the nuts 41, the strength surface pressure can be lowered.

A method for supporting the floor beam 1 according to the first embodiment having the above-described configuration with the building frame A will be described.
First, a method for manufacturing the floor beam 1 will be described with reference to FIG.
As shown in FIG. 11A, an H-shaped steel for floor beams (for example, SWH400 of JISG3353) is prepared, and the web 11 and the lower flange 13 corresponding to the beam end portion 1A are cut.
Thereafter, as shown in FIG. 11 (B), a member in which the end plate portion 14, the joining piece portion 13A and the inclined piece portion 13B are integrated from a long steel plate is formed in advance by bending or the like. The obtained plate-like member is welded to the web 11. The nut 41 is previously joined to the joining piece 13A by welding or the like.

Here, the welding locations are as shown in FIG. That is, welding is performed at the butted portion P1 between the bottom piece 13C and the inclined piece 13B. Welding is performed at an abutting portion P2 between the bent portions of the inclined piece portion 13B and the joining piece portion 13A and the lower end edge corner portion of the web 11. The upper surface of the joining piece portion 13A and the lower edge of the web 11 are welded at a contact portion P3 between the two nuts 41. Welding is performed at both contact portions P4 sandwiching the nut 41 of the contact portion P3. Welding is performed at a contact portion P5 along the top and bottom of the end plate portion 14, the side edge portion of the web 11, and the end edge of the upper flange 12.
Furthermore, as shown in FIG. 11D, the first stiffener 151, the second stiffener 152, and the third stiffener 153 are joined to each other at a predetermined position between the upper flange 12 and the lower flange 13 by welding or the like.

Next, the floor beams 1 manufactured in this way are supported by brackets 3 attached to building structures A facing each other.
Therefore, the attachment piece 31 of the bracket 3 is attached to the building case A, and then the beam end 1A of the floor beam 1 is supported by the main body 32 of the bracket 3. At this time, the position of the floor beam 1 is adjusted so that the two nuts 41 arranged in the longitudinal direction of the floor beam 1 are positioned in the long hole 320 of the bottom surface portion 32A.
Thereafter, the bolt 42 is screwed into the nut 41 with the washer plate 5 positioned below the bottom surface portion 32 </ b> A of the bracket 3.

Therefore, in the first embodiment, the following operational effects can be achieved.
(1) A web 11 and an upper flange 12 and a lower flange 13 joined to the top and bottom of the web 11 are provided. The height from the upper flange 12 to the lower flange 13 is lower than the beam center portion 1B. did. Therefore, since the beam end 1A is higher than the beam central portion 1B, the underfloor space is wide at the beam end 1A, and the work under the floor becomes easy.

(2) Since the thickness dimension of the lower flange 13 is set so that the beam end portion 1A is thicker than the beam center portion 1B, the beam strength at the beam end portion 1A having a short beam formation can be increased.

(3) In the beam end portion 1 </ b> A, stiffeners 151 to 153 are provided between the upper flange 12 and the lower flange 13 so as to be orthogonal to the web 11. Therefore, the beam strength of the beam end portion 1A having a short beam formation can be increased by the stiffeners 151 to 153.

(4) The floor beam support structure 2 is configured to include a bracket 3 that receives the beam end 1A and a joining member 4 that joins the bracket 3 and the beam end 1A. The bracket 3 is configured to have a bottom surface portion 32A that supports the joining piece portion 13A of the beam end portion 1A, and a side surface portion 32B that is provided on both sides of the bottom surface portion 32A and faces the web 11. For this reason, since the bracket 3 positions the beam end 1A of the floor beam 1 below and in the left-right direction, the floor beam 1 can be properly attached to the bracket 3.

(5) The joining member 4 includes a nut 41 that is joined in advance to the joining piece portion 13A constituting the beam end portion 1A, and a bolt 42 that passes through the long hole 320 formed in the longitudinal direction of the bottom surface portion 32A. Configured. The floor beam 1 can be easily attached to the bracket 3 even if the position of the bracket 3 and the floor beam 1 in the longitudinal direction of the floor beam is shifted by the long hole 320 formed in the bottom surface portion 32A.

(6) Since the floor beam 1 includes the end plate portion 14 integrally formed with the joining piece portion 13A and joined to the end edge portion between the joining piece portion 13A and the upper flange 12, Strength can be increased.

A second embodiment of the present invention will be described with reference to FIGS.
The second embodiment is different from the first embodiment in that a reinforcing plate is provided on the floor beam 1 and where the stiffener is installed, and other configurations are the same as those in the first embodiment.
In FIG.12 and FIG.13, in 2nd Embodiment, the 2nd stiffener 152 is abbreviate | omitted among the stiffeners 15, and the 1st stiffener 151 and the 3rd stiffener 153 are provided in the beam end part 1A. The dimension in the width direction orthogonal to the longitudinal direction of the upper flange 12 is longer than the dimension in the width direction of the lower flange 13.
A reinforcing plate 6 is provided in parallel with the web 11 between the upper flange 12 and the lower flange 13 of the beam end portion 1A.

The reinforcing plate 6 includes a first reinforcing plate 61 that is overlapped and joined to the plane of the web 11, and a second reinforcing plate 62 that is disposed away from the first reinforcing plate 61. A pair of the first reinforcing plate 61 and the second reinforcing plate 62 is disposed with the web 11 in between.
The thickness dimensions of the first reinforcing plate 61 and the second reinforcing plate 62 may be the same or different. For example, the thickness dimension of the first reinforcing plate 61 is 4.5 mm, and the thickness dimension of the second reinforcing plate 62 is 6.0 mm.

The first reinforcing plate 61 has a planar rectangular shape, and the base end edge located on the beam center portion side is joined to the first stiffener 151, and the tip edge located on the opposite side to the beam center portion is the third edge. Joined to stiffener 153.
The first reinforcing plate 61 has an upper end edge away from the upper flange 12 and a lower end edge away from the joining piece portion 13A.
The second reinforcing plate 62 has a shape in which the plane is surrounded by the upper flange 12, the joining piece portion 13A, the inclined piece portion 13B, the first stiffener 151, and the third stiffener 153 on the second stiffener side. The upper edge of the second reinforcing plate 62 is joined to the lower surface of the upper flange 12. The lower edge of the second reinforcing plate 62 is joined to the joining piece portion 13A and the inclined piece portion 13B. The second reinforcing plate 62 has a base edge joined to the first stiffener 151 and a tip edge joined to the third stiffener 153.

In the second embodiment, in addition to the same effects as (1) to (6) of the first embodiment, the following effects can be achieved.
(7) Since the reinforcing plate 6 is provided in the beam end portion 1A in parallel with the web 11 between the upper flange 12, the joining piece portion 13A, and the inclined piece portion 13B, the beam end portion 1A having a short beam formation is provided. The beam strength at can be increased. In particular, since the reinforcing plate 6 is provided in the joint piece portion 13A and the inclined piece portion 13B where the strength is reduced, the floor beam 1 can be effectively reinforced.

(8) The first reinforcing plate 61 is joined to the web 11 in a state of being overlapped. By joining the first reinforcing plate 61 to the web 11, it is possible to obtain a large reinforcing effect by increasing the overall thickness of the web 11.

(9) The second reinforcing plate 62 is disposed away from the web 11, the upper edge thereof is joined to the lower surface of the upper flange 12, and the lower edge thereof is joined to the upper surfaces of the joining piece portion 13 </ b> A and the inclined piece portion 13 </ b> B. Yes. Therefore, the upper flange 12 and the lower flange 13 can be prevented from being deformed by a large load.

Next, a third embodiment of the present invention will be described with reference to FIGS.
The third embodiment is different from the second embodiment in that the first reinforcing plate 61 is not provided, and other configurations are the same as those of the second embodiment.
14 and 15, in the third embodiment, the reinforcing plate 6 is only the second reinforcing plate 62 arranged away from the plane of the web 11, and the first reinforcing plate 61 is not arranged.
In 3rd Embodiment, there can exist the same effect as (1)-(7) (9) of 2nd Embodiment.

Next, a fourth embodiment of the present invention will be described with reference to FIGS.
The fourth embodiment is different from the second embodiment in that one of the two third stiffeners 153 is not provided on the base end side, and the shape of the reinforcing plate is different. This is the same as the second embodiment.
16 and 17, in the fourth embodiment, the stiffener 15 includes a first stiffener 151 and a third stiffener 153 proximate to the end plate portion 14.
The first reinforcing plate 61 has a planar rectangular shape, its base end edge is joined to the first stiffener 151, and its distal end edge is joined to the third stiffener 153.

The second reinforcing plate 62 has a shape surrounded by the upper flange 12, the joining piece portion 13A, the inclined piece portion 13B, the first stiffener 151, and the third stiffener 153 on the end plate portion side. The second reinforcing plate 62 has a base edge joined to the first stiffener 151 and a tip edge joined to the third stiffener 153.
In 4th Embodiment, there can exist the same effect as (1)-(9) of 2nd Embodiment.

Next, a fifth embodiment of the present invention will be described with reference to FIGS.
The fifth embodiment is different from the second embodiment in that the second reinforcing plate 62 is not provided, and other configurations are the same as those of the second embodiment.
18 and 19, in the fifth embodiment, the reinforcing plate 6 is only the first reinforcing plate 61 that is overlapped and joined to the plane of the web 11, and the second reinforcing plate 62 is not disposed. Therefore, the first reinforcing plate 61 is exposed to the outside.
In 5th Embodiment, there can exist the same effect as (1)-(8) of 2nd Embodiment.

In addition, this invention is not limited to the said embodiment, The deformation | transformation shown below is included in the range which can achieve the objective of this invention.
For example, in each of the above embodiments, the stiffener 15 and the reinforcing plate 6 are provided as the reinforcement of the floor beam 1, but in the present invention, it is not always necessary to provide these reinforcing members.
In the present invention, the shape of the beam end 1A may be a normal rectangular shape.
Furthermore, the thickness dimension of the lower flange 13 is made thicker at the beam end 1A than at the beam center 1B. However, in the present invention, the upper flange 12 and the lower flange 13 may have the same thickness dimension, Even if they are different, the upper flange 12 may be thicker than the lower flange 13.
In the above-described embodiment, one washer plate 5 is used when screwing the four bolts 42 to the nut 41, but in the present invention, instead of using one washer plate 5, each bolt 42 is used. A washer may be used.

Examples for confirming the effects of the present invention will be described.
[Specimen]
Three types were prepared: a floor beam test body 1 without a stiffener and a reinforcing plate, a floor beam test body 2 with only a stiffener, and a floor beam test body 3 with a stiffener and a reinforcing plate.
The total length of the floor beam 1 is 3298 mm, the length of the beam end portion 1A is 487 mm, and the length of the beam center portion 1B is 2324 mm. In the beam formation, the beam central portion 1B is 200 mm, and the region corresponding to the joining piece portion 13A in the beam end portion 1A is 91.5 mm.
In the test bodies 2 and 3, all of the first stiffener 151 to the third stiffener 153 are arranged, and the reinforcing plate of the test body 3 is only the first reinforcing plate 61 as shown in the fifth embodiment. . The thickness dimension of the first reinforcing plate 61 is 6 mm.

[Test method]
The beam end portion 1A of the floor beam 1 is supported by the bracket 3 attached to the building frame A. A load is applied to each of the predetermined lengths (positions of the beam center portion 1B) from both ends of the floor beam 1.
A load is applied to each of the test bodies 1 to 3 until the floor beam 1 and the bracket 3 are broken, and the displacement at a plurality of points at that time is measured.

[Test results]
In the test body 1 without the stiffener and the reinforcing plate, the upper flange 12 and the lower flange 13 were buckled and the web 11 was broken.
In the test body 2 having the stiffener 15, the upper flange 12 and the lower flange 13 were buckled.
In the test body 3 having the stiffener 15 and the first reinforcing plate 51, the floor beam 1 was detached from the bracket 3 before the floor beam 1 itself was broken.
From the above test results, it is understood that the strength is high in the order of the test body 3 with the stiffener 15 and the first reinforcing plate 61, the test body 2 with only the stiffener 15 and the test body 1 without both the stiffener and the reinforcing plate. .

  The present invention can be used for floor beams of houses and other buildings.

  DESCRIPTION OF SYMBOLS 1 ... Floor beam, 1A ... Beam end part, 1B ... Beam center part, 2 ... Floor beam support structure, 3 ... Bracket, 4 ... Joining member, 6 ... Reinforcement plate, 11 ... Web, 12 ... Upper flange, 13 ... Lower part Flange, 13A ... Junction piece part, 13B ... Inclined piece part, 13C ... Bottom piece part, 15 ... Stiffener, 32 ... Main body part, 32A ... Bottom part, 32B ... Side part, 41 ... Nut, 42 ... Bolt, 61th One reinforcing plate, 62 ... second reinforcing plate, 151 ... first stiffener, 152 ... second stiffener, 153 ... third stiffener, A ... building frame

Claims (6)

A web, an upper flange joined to the upper edge of the web, and a lower flange joined to the lower edge of the web;
The height from the upper flange to the lower flange, beam end portion positioned on both sides in the longitudinal direction of the beam center portion than the beam center portion is rather low,
The floor beam is characterized in that at least one thickness of the upper flange and the lower flange is thicker at the beam end than at the beam center . The floor beam according to claim 1 ,
A stiffener is provided at the beam end so as to intersect the web between the upper flange and the lower flange. In the floor beam according to claim 1 or claim 2 ,
A floor beam, wherein a reinforcing plate is provided at the beam end portion in parallel with the web between the upper flange and the lower flange, respectively. In the floor beam according to claim 3 ,
The floor beam, wherein the reinforcing plate is joined to the web. In the floor beam according to claim 3 ,
The reinforcing plate is disposed away from the web, the upper edge of the reinforcing plate is joined to the lower surface of the upper flange, and the lower edge of the reinforcing plate is joined to the upper surface of the lower flange. Floor beam to be. A web, an upper flange joined to the upper edge of the web, and a lower flange joined to the lower edge of the web, and the height from the upper flange to the lower flange is higher than the beam center than the beam A floor beam support structure for supporting a floor beam having a low beam end located on both longitudinal sides of the center part ,
A bracket that receives the beam end and is attached to a building frame, and a joining member that joins the bracket and the beam end,
The bracket, possess a bottom portion for supporting the lower flange of the beam end, and a side portion facing the web is provided on both sides of the bottom portion,
The joining member includes a nut that is pre-joined to the lower flange, and a bolt that is inserted into a long hole formed in the longitudinal direction of the bottom surface portion and screwed into the nut. Beam support structure.

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