JP2023078554A - Beam structure comprising reinforcing beam and joint member - Google Patents

Abstract

To provide a beam structure comprising a reinforcing beam and a joint member in which a joint member not compatible with a reinforcing beam having a high beam height can be used and the occurrence of collapse of a reinforcing beam can be suppressed.SOLUTION: A beam structure 1 comprises a reinforcing beam 2 and a joint member 3 to which an end portion of the reinforcing beam 2 in the longitudinal direction is joined. The reinforcing beam 2 has a beam body portion 21 and a reinforcing portion 24. The beam body portion 21 has a body web 22 and a body flange 23. The reinforcing portion 24 has a reinforcing web 25 extending downwardly from a lower body flange 232 and a reinforcing flange 26 formed at the lower end of the reinforcing web 25. A vertical length H24 of the reinforcing portion 24 is 60% or less of a vertical length H21 of the beam body portion 21. The joint member 3 has a joint web 31 and a joint flange 32. A longitudinal end of the body web 22 is joined to the joint web 31, and a longitudinal end of the body flange 23 joins or faces the joint flange 32.SELECTED DRAWING: Figure 5

Description

TECHNICAL FIELD The present disclosure relates to a beam structure including a reinforcing beam and a joining member, and more specifically, a reinforcing beam having a beam main body and a reinforcing portion, and a joining member to which ends in the longitudinal direction of the reinforcing beam are joined. It relates to a beam structure with.

2. Description of the Related Art Conventionally, a load bearing member having a plurality of supporting members made of H-shaped steel is known (see Patent Document 1, for example). The load bearing member comprises a first support member and a second support member each having a weld flange, a web and an outer flange, the weld flanges being welded together. As a result, a beam member having a beam height twice as large as that of the supporting member alone is constructed.

JP 2018-123484 A

In the beam member disclosed in Patent Document 1, the rigidity as a beam, that is, the bending rigidity against bending in the direction along the surface of the web is improved. However, if the longitudinal ends of the beam member are to be joined to a joining member rather than resting on another beam member, the beam member having a high beam height can be replaced with an existing beam having a lower beam height. There is a problem that it is difficult to share the member and the joining member.

The present disclosure provides a beam structure including a reinforcing beam and a joining member that can use a joining member that is not compatible with a reinforcing beam with a high beam height and that can suppress the occurrence of collapse of the reinforcing beam. With the goal.

A beam structure according to one aspect of the present disclosure is a beam structure including a reinforcing beam and a joint member to which the longitudinal end of the reinforcing beam is joined. The reinforcement beam has a beam body and a reinforcement. The beam body portion has a body web extending in the vertical direction and body flanges formed at upper and lower ends of the body web, respectively. The reinforcing portion has a reinforcing web extending downward from the lower body flange and a reinforcing flange formed at the lower end of the reinforcing web. The vertical length of the reinforcing portion is 60% or less of the vertical length of the beam body portion. The joining member has a joining web and a joining flange. The joining webs extend vertically to correspond to longitudinal ends of the body webs. The joint flanges are respectively formed at the upper and lower ends of the joint web to correspond to the ends of the body flange in the longitudinal direction. The longitudinal ends of the body web are joined to the joining web. The longitudinal end of the main body flange joins or faces the joining flange.

In the beam structure including the reinforcing beams and the joining members according to the present disclosure, it is possible to use joining members that are not compatible with reinforcing beams with a high beam height, and to suppress the occurrence of collapse of the reinforcing beams. can.

FIG. 1 is a front view of a main part of a frame structure using a beam structure according to the first embodiment. FIG. 2 is a sectional view of a reinforcing beam in the same beam structure. FIG. 3 is an exploded perspective view of a portion including beams and joint members of the same beam structure. FIG. 4 is a cross-sectional view of a normal beam in the same beam structure. FIG. 5 is a perspective view of the essential part of the beam structure of the same. FIG. 6 is a perspective view of essential parts of the beam structure according to the second embodiment. FIG. 7 is a perspective view of the beam structure according to the third embodiment.

<1> First Embodiment A beam structure including reinforcing beams and joining members according to a first embodiment of the present disclosure will be described below with reference to FIGS. 1 to 5. FIG.

As shown in FIG. 1, the beam structure 1 of the present disclosure constitutes part of a framework 10, such as the framework of a prefabricated house. In the frame structure 10, for example, a pillar 12 of the first floor is erected on a foundation beam 11, and a floor beam 13 of the second floor is erected on the upper end of the pillar 12 of the first floor via a joint member 3. A pillar 14 of the second floor is erected on the joint member 3 joined to the second floor, and a roof beam 15 is constructed over the upper end of the pillar 14 of the second floor via the joint member 3 . The beam structure 1 of the present disclosure is used as the floor structure of the second floor by using the reinforcing beams 2 for the floor beams 13 of the second floor, for example.

In addition, in the first embodiment, the beam structure 1 (framework 10) has load-bearing frames 4 that constitute load-bearing walls. The bearing frame 4 is provided with a pair of pillars 41 spaced apart and a brace member 42 arranged between the pair of pillars 41, and is composed of these pillars 41 and the brace member 42. be. The bearing frame 4 is connected to the upper side of the reinforcement beam 2 (floor beam 13) on the second floor. The load-bearing frame 4 is connected to the reinforcing beam 2 by welding the lower end of the column 41 to the upper surface of the body flange 231 on the upper side of the reinforcing beam 2, but it may be connected by bolting or the like. Not limited. In addition, such a load-bearing frame 4 is an arbitrary configuration in the beam structure 1 , and the beam structure 1 may not have the load-bearing frame 4 .

The beam structure 1 includes reinforcing beams 2 and joint members 3 to which ends of the reinforcing beams 2 in the longitudinal direction (horizontal direction) are joined.

One or a plurality of reinforcing beams 2 are provided in the beam structure 1 . As shown in FIG. 2 , the reinforcement beam 2 has a beam body portion 21 and a reinforcement portion 24 . The beam body portion 21 has a body web 22 and body flanges 23 formed at upper and lower end portions of the body web 22, respectively. In the first embodiment, the beam body portion 21 is made of so-called H-section steel.

In a cross section perpendicular to the longitudinal direction of the reinforcing beam 2, the body web 22 extends vertically. A horizontally extending upper body flange 231 is formed at the upper end of the body web 22 , and a horizontally extending lower body flange 232 is formed at the lower end of the body web 22 . The load-bearing frame 4 described above is connected to the upper surface of the body flange 231 on the upper side of the reinforcement beam 2 that constitutes the floor beam 13 of the second floor. The vertical length H21 of the beam main body 21, that is, the length from the upper surface of the upper main body flange 231 to the lower surface of the lower main body flange 232 is 250 mm in the first embodiment. Further, the width direction length B21 of the beam body portion 21, that is, the length of the body flange 23 in the lateral direction perpendicular to the longitudinal direction of the reinforcing beam 2 is 100 mm in the first embodiment. Also, the thickness of the body web 22 and the body flange 23 is 4.5 mm in the first embodiment.

The reinforcement part 24 has a reinforcement web 25 and a reinforcement flange 26 . The reinforcing web 25 extends downwardly from the lower body flange 232 . Specifically, the upper end of the reinforcing web 25 is welded to the lower surface of the lower body flange 232 . Reference numeral 27 in the figure denotes a fillet portion. The reinforcing web 25 is located at the same position as the main web 22 in the width direction of the reinforcing beam 2 . In other words, the reinforcing web 25 is linearly continuous with the body web 22 via the body flange 232 on the lower side.

A reinforcing flange 26 is formed at the lower end of the reinforcing web 25 . The length of the reinforcing flange 26 in the width direction is 100 mm in the first embodiment.

The vertical length H24 of the reinforcing portion 24, that is, the length from the upper end of the reinforcing web 25 (the portion in contact with the lower surface of the main body flange 232 on the lower side) to the lower surface of the reinforcing flange 26 is the same as in the first embodiment. is 150 mm. The reinforcing portion 24 is made of so-called T-shaped steel. The widthwise length of the reinforcing portion 24 is 100 mm, which is the same as the widthwise length B21. Further, the thickness of the reinforcing web 25 and the reinforcing flange 26 is 4.5 mm, which is the same as the thickness of the main body web 22 and the main body flange 23 in the first embodiment.

The beam length of the reinforcing beam 2, that is, the length from the upper surface of the body flange 231 on the upper side of the reinforcing beam 2 to the lower surface of the reinforcing flange 26 is 400 mm.

As shown in FIG. 3, the joining member 3 has a joining web 31 and a joining flange 32 . The joining webs 31 extend in the vertical direction, and in the first embodiment, one joining member 3 has a plurality of joining webs 31 and joining flanges 32, and has a cross shape in plan view, It has joints 311 to 314 at its tip. The joints 311 to 314 respectively correspond to ends of the main web 22 in the longitudinal direction. The vertical length of the joining web 31, that is, the length from the upper end to the lower end of the joining web 31 is 250 mm, which is the same as the main web 22 in the first embodiment.

The joint flanges 32 are respectively formed at the upper and lower ends of the joint web 31 and correspond to the ends of the body flange 23 in the longitudinal direction. Specifically, a horizontally extending upper joining flange 321 is formed at the upper end of the joining web 31 , and a horizontally extending lower joining flange 322 is formed at the lower end of the joining web 31 . In the first embodiment, the joining flange 32 has a square shape in plan view, and the length of one side of the joining flange 32 is 100 mm, which is the same as the length of the body flange 23 in the width direction. Also, in the first embodiment, the thickness of the joint web 31 is 4.5 mm, which is the same as that of the main web 22, and the thickness of the joint flange 32 is 6 mm.

The joint flange 32 is formed with connection portions 34 to the pillars 12 and 14 that are connected to the lower and upper sides of the joint member 3, respectively. In the first embodiment, the connection portion 34 is a bolt hole through which a bolt (not shown) as a connector that connects the joint member 3 and the column 12 is inserted, and is sandwiched between the joint portion 311 and the joint portion 312. a region sandwiched between the joints 312 and 313; a region sandwiched between the joints 313 and 314; and a region sandwiched between the joints 314 and 311. A connecting portion 34 consisting of a hole is formed.

The pillars 12 and 14 have a main body tube portion 16 shaped like a rectangular tube, and flanges 17 formed at upper and lower end portions of the main body tube portion 16, respectively. In the first embodiment, the flange 17 has a square shape with a side length of 100 mm, which is the same as the joint flange 32, and connection portions formed of bolt holes are provided at positions corresponding to the connection portions 34 of the joint flange 32, respectively. 18 are formed.

The joint member 3 is placed on the upper flange 17 so that the connection portion 18 formed on the upper flange 17 of the column 12 and the connection portion 34 formed on the lower joint flange 322 of the joint member 3 communicate with each other. the lower joining flange 322 of the . Then, the column 12 and the joint member 3 are connected by inserting a bolt as a connector through the connection portion 18 and the connection portion 34 and tightening the nut onto the bolt. In addition, on the upper joint flange 321 so that the connection portion 34 formed on the upper joint flange 321 of the joint member 3 and the connection portion 18 formed on the lower flange 17 of the column 14 communicate with each other, Place the flange 17 on the underside of the post 14 . Then, the joint member 3 and the pillar 14 are connected by inserting a bolt as a connector through the connection portion 18 and the connection portion 34 and tightening the nut onto the bolt.

The joints 311 - 314 protrude from the joint flange 32 . In other words, the joints 311 to 314 are positioned outside the joint flange 32 in plan view. The joint portions 311 to 314 are formed with a connection portion 33 consisting of a bolt hole through which a bolt (not shown) as a connector for connecting with the beam body portion 21 of the reinforcing beam 2 is inserted. A connection portion 221 formed of a bolt hole is formed at a position corresponding to the connection portion 33 at the end portion in the longitudinal direction of the main body web 22 .

As shown in FIGS. 3 and 5, when joining the reinforcing beam 2 and the joining member 3, first, the connecting portion 33 formed in the joining portion 311 of the joining member 3 and the main body of the beam body portion 21 of the reinforcing beam 2 The joint portion 311 and the main web 22 are overlapped so that the connecting portion 221 formed on the web 22 communicates with each other. At this time, the end portion of the joint flange 32 in the direction along the surface and the end portion of the main body flange 23 in the longitudinal direction are butted against each other. Then, a bolt as a connector is inserted through the connecting portion 33 and the connecting portion 221 , and a nut is tightened on the bolt, so that the longitudinal end portion of the main body web 22 is joined to the joining web 31 . In addition, in the first embodiment, the longitudinal end portion of the body flange 23 is butted against and faces the joint flange 32 . Similarly, the end portion of another reinforcing beam 2 is also joined to the joining portion 312 of the joining member 3 . Thus, the reinforcing beam 2 and the joining member 3 are joined. The joining of the reinforcing beam 2 and the joining member 3 is such that the beam body portion 21 of the reinforcing beam 2 and the joining member 3 are directly joined, and the reinforcing portion 24 of the reinforcing beam 2 is It is not directly joined to the joining member 3 .

As shown in FIG. 1, the beam structure 1 further includes a normal beam 5 having a beam body 51 and no reinforcing portion. As shown in FIG. 4, the beam body portion 51 includes a body web 52 and body flanges 53 (an upper body flange 531 and a lower body flange 532) formed at the upper and lower ends of the body web 52, respectively. have. In the first embodiment, the beam main body 51 is made of H-shaped steel and has the same cross-sectional shape as the beam main body 21 described above. A connection portion 521 (see FIG. 3) made of a bolt hole is formed at a position corresponding to the connection portion 33 at the longitudinal end portion of the body web 52 . The beam height H51 of the normal beam 5, that is, the length from the upper surface of the upper main body flange 531 of the normal beam 5 to the lower surface of the lower main body flange 532 is the vertical length H21 of the beam main body portion 21 of the reinforcing beam 2. is 250 mm, which is the same as Moreover, the length B51 in the width direction of the body flange 53 is 100 mm.

As shown in FIGS. 3 and 5, when joining the ordinary beam 5 and the joining member 3, first, the connection portion 33 formed at the joining portion 313 of the joining member 3 and the beam body portion 51 of the ordinary beam 5 are connected to each other. The joint portion 313 and the main web 52 are overlapped so that the connection portion 521 formed on the web 52 communicates with each other. At this time, the longitudinal end of the joint flange 32 and the longitudinal end of the body flange 53 are butted against each other. Then, a bolt as a connector is inserted through the connecting portion 33 and the connecting portion 521 , and a nut is tightened on the bolt, so that the longitudinal end portion of the main body web 52 is joined to the joining web 31 . In addition, the longitudinal end of the main body flange 53 abuts and faces the joint flange 32 . Similarly, the end portion of another normal beam 5 is joined to the joint portion 314 of the joint member 3 as well.

As shown in FIG. 2, in the beam structure 1, the vertical length H24 of the reinforcing portion 24 is set to be 60% or less of the vertical length H21 of the beam body portion 21. As shown in FIG. This point will be described below.

The beams (the reinforcing beams 2 and the normal beams 5) are subjected to force from heavy objects such as load-bearing walls having load-bearing frames 4, other wall materials, and floor materials. For this reason, it is preferable that the beam has a high bending rigidity against vertical bending (bending along the surface of the web). Thus, a reinforced beam 2 with a higher beam height than the normal beam 5 was developed. Since the beam height of the reinforcing beam 2 is higher than the beam height H51 of the normal beam 5, it is necessary to change the joint member 3 originally designed to match the normal beam 5. - 特許庁However, if the joint member 3 is changed, design and development work will be required, and the number of types of the joint member 3 will increase, which will require management work, which is not preferable. Therefore, as described above, in the reinforcing beam 2 , only the portion of the beam main body 21 that is the same as (the beam main body 51 of) the normal beam 5 is joined to the existing joint member 3 . As a result, there is no need to design and develop a new joining member 3, which saves time and effort for the above.

In addition, in the reinforcing beam 2, the bending rigidity against bending in the vertical direction increases as the length H24 of the reinforcing portion 24 in the vertical direction is increased to increase the height of the reinforcing beam 2. FIG. However, the longer the vertical length H24 of the reinforcing portion 24, the more likely another problem occurs. Another problem is that of the reinforcing beam 2 , the reinforcing portion 24 that is not joined to the joining member 3 falls down.

When a downward force from various heavy objects is applied to the intermediate portion in the longitudinal direction of the reinforcing beam 2 , the length of the reinforcing portion 24 in the longitudinal direction is greater than the length of the main beam portion 21 in the longitudinal direction. A bending moment that lengthens the length is applied. In this case, since the reinforcement portion 24 is extended, the reinforcement portion 24 does not collapse. However, depending on the force received from the bearing frame 4 connected to the reinforcement beam 2 or the force received due to an earthquake or the like, an upward force is applied to the intermediate portion of the reinforcement beam 2 in the longitudinal direction. In this case, the reinforcing beam 2 is subjected to a bending moment that shortens the longitudinal length of the reinforcing portion 24 with respect to the longitudinal length of the beam body portion 21 . At this time, the reinforcing portion 24 receives a compressive force in the longitudinal direction, and bends in the lateral direction (perpendicular to the side surface of the main web 22).

When the reinforcing portion 24 falls down, it becomes difficult for the reinforcing portion 24 to increase the flexural rigidity of the reinforcing beam 2 , resulting in a decrease in the flexural rigidity of the reinforcing beam 2 . Falling of the reinforcing portion 24 is more likely to occur as the vertical length H24 of the reinforcing portion 24 increases. Therefore, the vertical length H24 of the reinforcing portion 24 is 60% or less of the vertical length H21 of the beam body portion 21 so that the reinforcing portion 24 is less likely to collapse while increasing the bending rigidity of the reinforcing beam 2. so that In addition, in the first embodiment, the lower limit of the vertical length H24 of the reinforcing portion 24 is set to 5% of the vertical length H21 of the beam body portion 21 . That is, the vertical length H24 of the reinforcing portion 24 is 5% or more and 60% or less of the vertical length H21 of the beam body portion 21 .

As described above, by setting the vertical length H24 of the reinforcing portion 24 to 60% or less of the vertical length H21 of the beam body portion 21, the reinforcing beam 2 having the reinforcing portion 24 that is not joined to the joint member 3 , the reinforcement portion 24 is less likely to collapse, and a decrease in bending rigidity of the reinforcing beam 2 due to the collapse of the reinforcement portion 24 can be suppressed.

Moreover, in the first embodiment, the load-bearing frame 4 is connected to the body flange 231 on the upper side of the reinforcing beam 2 . In this case, since the load-bearing frame 4 does not need to be directly connected to the reinforcement portion 24, the reinforcement portion 24 is not particularly restricted and can be formed in the beam body portion 21 over the entire length in the longitudinal direction of the beam body portion 21. . Thereby, it is easy to increase the bending rigidity of the reinforcing beam 2 .

In addition, since existing joint members 3 that can be joined to ordinary beams 5 are used, reinforcing beams 2 can be used only in necessary portions, which facilitates design and construction and facilitates cost reduction.

<2> Second Embodiment Next, a beam structure 1 according to a second embodiment will be described with reference to FIG. The beam structure 1 according to the second embodiment is mostly the same as the beam structure 1 according to the first embodiment. For this reason, explanations that overlap with the first embodiment will be omitted.

The beam structure 1 further comprises lateral stiffening beams 6 . The lateral stiffening beams 6 are made of H-beam steel with stiffening webs 61 and stiffening flanges 62 . The stiffening web 61 extends in the horizontal direction and has a connecting portion (not shown) consisting of a bolt hole similar to the connecting portion 221 of the main body web 22 at the tip in the longitudinal direction.

The stiffening flanges 62 are respectively formed at the upper and lower ends of the stiffening web 61 and correspond to the side surfaces of the body flange 23 along the longitudinal direction. Specifically, a horizontally extending upper stiffening flange 621 is formed at the upper end of the stiffening web 61 , and a horizontally extending lower stiffening flange 622 is formed at the lower end of the stiffening web 61 . It is The widthwise length of the stiffening flange 62 is 100 mm, which is the same as the widthwise length of the body flange 23 . The thickness of the stiffening web 61 is 2.8-4.5 mm, and the thickness of the stiffening flange 62 is 3.2-12 mm.

The vertical length of the lateral stiffening beam 6, that is, the length from the upper surface of the upper stiffening flange 621 to the lower surface of the lower stiffening flange 622 is 250 mm, which is the same as the vertical length H21 of the beam body 21. is. The shape of the cross section perpendicular to the longitudinal direction of the lateral stiffening beam 6 is the same as the shape of the cross section perpendicular to the longitudinal direction of the normal beam 5 .

A connection piece 222 is connected to the side surface of the body web 22 by welding. The connecting piece 222 corresponds to the longitudinal end of the stiffening web 61 . The vertical length of the connecting piece 222 is 250 mm, which is the same as that of the main web 22 . The thickness of the connecting piece 222 is 4.5 mm, which is the same as that of the main web 22 .

The connection piece 222 protrudes from the body flange 23 . In other words, the end of the connection piece 222 is positioned outside the body flange 23 in plan view. The connecting piece 222 is formed with a connecting portion 223 which is a bolt hole through which a bolt (not shown) as a connecting tool for connecting with the beam body portion 21 is inserted.

The ends of the lateral stiffening beams 6 in the longitudinal direction are connected to the longitudinal side surfaces of the beam main body portions 21 of the reinforcing beams 2 . Specifically, first, the stiffening webs 61 are arranged so that the connection portions formed in the stiffening webs 61 of the lateral stiffening beams 6 and the connection portions 223 formed in the connection pieces 222 of the reinforcing beams 2 communicate with each other. and the connection piece 222 are overlapped. At this time, the longitudinal end of the stiffening flange 62 and the longitudinal side end of the body flange 23 are butted against each other. Then, a bolt as a connector is inserted between the connecting portion formed in the stiffening web 61 and the connecting portion 223 , and the nut is tightened on the bolt so that the longitudinal end of the stiffening web 61 is connected to the main web 22 . Connected to the side.

A column 12 is connected to the lower side of the portion of the reinforcing beam 2 to which the lateral stiffening beam 6 is connected. The column 12 is connected to the reinforcing beam 2 by welding the upper end of the column 12 to the lower surface of the reinforcing flange 26 on the lower side of the reinforcing beam 2, but it may be connected by bolting or the like. Not limited.

By connecting the lateral stiffening beams 6 to the reinforcing beams 2, the reinforcing parts 24 are less likely to collapse, and the reduction in bending rigidity of the reinforcing beams 2 due to the occurrence of the reinforcing parts 24 to collapse is further reduced. can be suppressed.

Also, by connecting the pillar 12 to the lower side of the reinforcing beam 2, the reinforcing portion 24 is less likely to collapse, and a decrease in bending rigidity of the reinforcing beam 2 can be further suppressed.

<3> Third Embodiment Next, a beam structure 1 according to a third embodiment will be described with reference to FIG. The beam structure 1 according to the third embodiment is mostly the same as the beam structure 1 according to the first embodiment. For this reason, explanations that overlap with the first embodiment will be omitted.

In the reinforcing beam 2 of the first embodiment, the reinforcing portion 24 is formed over the entire longitudinal length of the beam body portion 21 . On the other hand, in the reinforcing beam 2 of the third embodiment, the longitudinal length of the reinforcing portion 24 in the reinforcing beam 2 is formed shorter than the longitudinal length of the beam body portion 21 . As a result, part of the lower surface of the lower main body flange 232 in the longitudinal direction is an exposed surface without the reinforcing portion 24 . A load-bearing frame 4 is connected to the exposed surface. The load-bearing frame 4 is connected to the reinforcing beam 2 by welding the upper end of the column 41 to the exposed surface of the body flange 232 on the lower side of the beam main body 21 of the reinforcing beam 2, but is not connected by bolting or the like. The connection method is not limited.

When the load-bearing frame 4 is connected to the lower surface of the reinforcing beam 2 , if the load-bearing frame 4 is connected to the lower surface of the reinforcing portion 24 , the reinforcing portion 24 is not joined to the joint member 3 , so the reinforcing portion 24 is stronger than the load-bearing frame 4 . Receiving is more likely to cause collapse. However, as in the third embodiment, by connecting the load-bearing frame 4 to the exposed surface that is the lower surface of the beam main body 21 instead of the lower surface of the reinforcing portion 24, the reinforcing portion 24 is less likely to collapse, and the reinforcing portion It is possible to suppress a decrease in bending rigidity of the reinforcing beams 2 due to the collapse of the beams 24 .

<4> Modifications Next, modifications of the first to third embodiments will be described.

The beam structure 1 may not be part of the frame 10 of the prefabricated house, and is not particularly limited. Moreover, the frame body 10 is not limited to the configuration described above.

The beam body 21 of the reinforcing beam 2 is not limited to so-called H-section steel, and may be made of metal (which may include non-metal) having a web and flanges formed at the upper and lower ends of the web. A specific value of the vertical length H21 of the beam body portion 21 is not limited to 250 mm. A specific value of the width direction length B21 of the beam body portion 21 is not limited to 100 mm. A specific value of the thickness of the body web 22 and the body flange 23 is not limited to 4.5 mm.

A specific value of the width direction length of the reinforcing flange 26 of the reinforcing portion 24 is not limited to 100 mm. The reinforcing part 24 is not limited to so-called T-shaped steel, and may be made of metal (which may include non-metal) having a web and a flange formed at the lower end of the web. A specific value of the vertical length H24 of the reinforcing portion 24 is not limited to 150 mm. A specific value of the width direction length of the reinforcing portion 24 is not limited to 100 mm. A specific value for the thickness of the reinforcing web 25 and reinforcing flange 26 is not limited to 4.5 mm.

The lower limit of the vertical length H24 of the reinforcing portion 24 may be 10%, 15%, 20%, 30%, etc. of the vertical length H21 of the beam body portion 21, and is set appropriately.

The connection of the column 12 to the reinforcing beam 2 may be performed by bolting or the like instead of welding, and the connection method is not limited. The location where the pillar 12 is connected to the reinforcing beam 2 may not be below the portion of the reinforcing beam 2 to which the lateral stiffening beam 6 is connected.

A single joint member 3 may not have a plurality of joint webs 31 . A specific value of the vertical length of the joining web 31 is not limited to 250 mm. A specific value of the length of one side of the joining flange 32 is not limited to 100 mm. A specific value for the thickness of the joining web 31 is not limited to 4.5 mm, and a specific value for the thickness of the joining flange 32 is not limited to 6 mm. The connection between the pillars 12 and 14 and the joint member 3 is not particularly limited, and may be, for example, welding instead of using a connecting tool made of bolts and nuts. The joining of the reinforcing beam 2 and the joining member 3 is not particularly limited, and may be, for example, welding instead of using a joining tool consisting of bolts and nuts. When joining the reinforcing beam 2 and the joining member 3 by welding, the body flange 23 and the joining flange 32 may be welded and joined in addition to the body web 22 and the joining web 31 being welded. Also, the longitudinal end of the body flange 23 may be joined to the joint flange 32 instead of facing the joint flange 32 .

The normal beam 5 is an arbitrary configuration in the beam structure 1 of the present disclosure, and does not have to be provided. Also, the beam main body portion 51 that constitutes the normal beam 5 may not be the same as the beam main body portion 21 of the reinforcing beam 2 . The connection between the beam 5 and the joint member 3 is not particularly limited, and may be, for example, welding instead of using a joint made of bolts and nuts. Also, the longitudinal end of the body flange 53 may be joined to the joint flange 32 instead of facing the joint flange 32 .

The lateral stiffening beam 6 is an arbitrary configuration in the beam structure 1 of the present disclosure, and may not be provided. The lateral stiffening beams 6 do not have to be made of H-section steel. A specific value of the widthwise length of the stiffening flange 62 is not limited to 100 mm. The specific value of the thickness of the stiffening web 61 is not limited to 2.8-4.5 mm, and the specific value of the thickness of the stiffening flange 62 is not limited to 3.2-12 mm. A specific value of the vertical length H21 of the lateral stiffening beam 6 is not limited to 250 mm. The shape of the cross section perpendicular to the longitudinal direction of the lateral stiffening beam 6 may not be the same as the shape of the cross section perpendicular to the longitudinal direction of the normal beam 5. They may be the same and are not particularly limited. The connection of the stiffening web 61 to the main body web 22 may be performed by bolting or the like instead of welding, and the connection method is not limited. Further, the stiffening flange 62 and the body flange 23 may be connected by welding, bolting, or the like.

<5> Conclusion As is clear from the first to third embodiments and their modifications described above, in the first mode, the reinforcing beams 2 and the ends in the longitudinal direction of the reinforcing beams 2 are joined. The beam structure 1 includes a joint member 3 that The reinforcement beam 2 has a beam body portion 21 and a reinforcement portion 24 . The beam main body 21 has a main body web 22 extending in the vertical direction and main body flanges 23 formed at upper and lower ends of the main body web 22 . The reinforcing portion 24 has a reinforcing web 25 extending downwardly from the lower body flange 232 and a reinforcing flange 26 formed at the lower end of the reinforcing web 25 . The vertical length H24 of the reinforcing portion 24 is 60% or less of the vertical length H21 of the beam body portion 21 . The joining member 3 has a joining web 31 and a joining flange 32 . The joining webs 31 extend vertically and correspond to the ends of the main web 22 in the longitudinal direction. The joint flanges 32 are respectively formed at the upper and lower ends of the joint web 31 and correspond to the ends of the body flange 23 in the longitudinal direction. The longitudinal ends of the body web 22 are joined to the joining webs 31 . A longitudinal end portion of the body flange 23 is joined to or faces the joint flange 32 .

According to the first aspect, in the reinforcing beam 2 having the reinforcing portion 24 that is not joined to the joint member 3, the reinforcing portion 24 is less likely to fall, and the bending of the reinforcing beam 2 due to the falling of the reinforcing portion 24 occurs. A decrease in rigidity can be suppressed.

A second aspect is realized by a combination with the first aspect. In a second aspect, the beam structure 1 further comprises a load-bearing frame 4 forming a load-bearing wall. The bearing frame 4 is connected to the main body flange 231 on the upper side of the reinforcing beam 2 .

According to the second aspect, since the load-bearing frame 4 is not directly joined to the reinforcing portion 24 , the reinforcing portion 24 is not particularly restricted, and the bending rigidity of the reinforcing beam 2 can be easily increased.

A third aspect is realized by a combination with the first or second aspect. In a third aspect, the beam structure 1 further comprises load-bearing frames 4 forming load-bearing walls. In the reinforcing beam 2 , the longitudinal length of the reinforcing portion 24 is shorter than the longitudinal length of the beam body portion 21 , and a part of the lower surface of the lower body flange 232 in the longitudinal direction is an exposed surface without the reinforcing portion 24 . A load-bearing frame 4 is connected to the exposed surface.

According to the third aspect, it is possible to prevent the reinforcing portion 24 from collapsing, and to suppress a decrease in bending rigidity of the reinforcing beam 2 due to the collapsing of the reinforcing portion 24 .

A fourth aspect is realized by a combination with any one of the first to third aspects. In a fourth aspect, the beam structure 1 further comprises a normal beam 5 having a beam body portion 51 and no reinforcing portion. One joining member 3 has a plurality of joining webs 31 and joining flanges 32 . The longitudinal ends of the body webs 52 of the beam body 51 of the beam 5 are usually joined to the joining webs 31 . The longitudinal end of the body flange 53 of the beam body 51 of the normal beam 5 is joined to or faces the joint flange 32 .

According to the fourth aspect, the reinforcing beams 2 can be used only in necessary portions, which facilitates design and construction and facilitates cost reduction.

A fifth aspect is realized by a combination with any one of the first to fourth aspects. In a fifth aspect, the beam structure 1 further comprises lateral stiffening beams 6 . The longitudinal ends of the lateral stiffening beams 6 are connected to the longitudinal side surfaces of the beam main bodies 21 of the reinforcing beams 2 .

According to the fifth aspect, since the lateral reinforcing beams 6 are connected to the reinforcing beams 2, the reinforcing portions 24 are less likely to collapse, and the reinforcing beams 2 due to the collapse of the reinforcing portions 24 are prevented. It is possible to further suppress the decrease in the bending rigidity of.

Reference Signs List 1 beam structure 10 frame 11 base beam 12 column 13 floor beam 14 column 15 roof beam 16 tubular body 17 flange 18 connection 2 reinforcing beam 21 beam body 22 body web 221 connection 222 connection piece 223 connection 23 body flange 231 Upper main body flange 232 Lower main body flange 24 Reinforcement part 25 Reinforcement web 26 Reinforcement flange 27 Fillet part 3 Joint member 31 Joint web 311 to 314 Joint part 32 Joint flange 321 Upper joint flange 322 Lower joint flange 33 Connection Part 34 Connection Part 4 Bearing Frame 41 Column 42 Brace Material 5 Ordinary Beam 51 Beam Body Part 52 Body Web 521 Connection Part 53 Body Flange 531 Upper Body Flange 532 Lower Body Flange 6 Lateral Stiffening Beam 61 Stiffening Web 62 Stiffening flange 621 Upper stiffening flange 622 Lower stiffening flange B21 Width direction length H21 Vertical direction length H24 Vertical direction length

Claims (5)

a reinforcing beam;
a joining member to which the ends in the longitudinal direction of the reinforcing beam are joined,
The reinforcing beam is
a beam body portion having a body web extending in the vertical direction and body flanges respectively formed at upper and lower ends of the body web;
a reinforcing web extending below the lower body flange and a reinforcing portion having a reinforcing flange formed at a lower end of the reinforcing web;
The vertical length of the reinforcing portion is 60% or less of the vertical length of the beam main body,
The joining member is
a joining web extending in the vertical direction and corresponding to an end portion in the longitudinal direction of the main web;
joint flanges respectively formed at upper and lower ends of the joint web and corresponding to ends of the body flange in the longitudinal direction;
the ends in the longitudinal direction of the body web are joined to the joining web,
The longitudinal end of the main body flange is joined to or faces the joining flange,
A beam structure with reinforcing beams and joining members. further comprising a load-bearing frame that constitutes the load-bearing wall,
the load-bearing frame is connected to the body flange above the stiffening beam;
A beam structure comprising the reinforcing beam according to claim 1 and a joining member. further comprising a load-bearing frame that constitutes the load-bearing wall,
In the reinforcing beam, the length in the longitudinal direction of the reinforcing portion is shorter than the length in the longitudinal direction of the beam body portion, and a part of the lower surface of the body flange on the lower side in the longitudinal direction is an exposed surface without the reinforcing portion,
the load-bearing frame is connected to the exposed surface;
A beam structure comprising the reinforcing beam according to claim 1 or 2 and a joint member. further comprising a normal beam having the beam body portion and not having the reinforcing portion;
one said joining member has a plurality of said joining webs and said joining flanges;
the end portion in the longitudinal direction of the body web of the beam main body portion of the normal beam is joined to the joint web,
The end portion in the longitudinal direction of the main body flange of the beam main body portion of the normal beam is joined to or faces the joint flange,
A beam structure comprising the reinforcing beam according to any one of claims 1 to 3 and a joint member. Further equipped with horizontal stiffening beams,
The end portion in the longitudinal direction of the lateral stiffening beam is connected to the side surface of the beam body portion of the reinforcing beam along the longitudinal direction,
A beam structure comprising the reinforcing beam according to any one of claims 1 to 4 and a joint member.

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