Reinforced beam and beam-column joint structure

Abstract

The present invention provides a stiffened beam that facilitates stiffening at the ends of a steel beam and ensures elastic shear buckling resistance even when the intermediate section of the steel beam is not stiffened. [Solution] The stiffening beam 16 has an upper flange 18, a lower flange 19, and a web 20 connected to the upper flange and the lower flange, respectively. The steel beam 17 is made of rolled H-shaped steel, and a group of stiffeners 22 is joined to the web from one side Y1 in the thickness direction Y of the web. The group of stiffeners is arranged in the material axis direction from the end of the steel beam in the material axis direction X to a range less than or equal to the beam depth of the steel beam, satisfying equation (1), and the thickness direction projection width d1 of the group of stiffeners from the web satisfies equation (2). 65√(235) / F <d / tw≦700 / 9 ··(1) d1 However, F is the standard strength for allowable stress, d is the internal depth of the steel beam, tw is the web thickness, and B is the width of the upper and lower flanges, respectively.​

Claims

1. A steel beam made of rolled H-shaped steel, having an upper flange, a lower flange, and webs connected to the upper flange and the lower flange, respectively, The web is joined to a group of stiffeners from one side in the thickness direction of the web, Equipped with, The stiffener group is arranged in the direction of the material axis from the end of the steel beam in the material axis direction to a range below the beam depth of the steel beam, (1) The equation is satisfied, The stiffener group has a projection width d1 in the thickness direction from the web that satisfies equation (2), thus providing a stiffening beam. 65√(235) / F<d / tw≦700 / 9...(1) d1<B / 2...(2) However, F is the standard strength of the allowable stress, d is the internal depth of the steel beam, tw is the thickness of the web, and B is the width of the upper flange and the lower flange, respectively.

2. The aforementioned Stifner group is, One or more horizontal stiffeners arranged along the axial direction of the material, One vertical stiffener intersects the material axis direction and is positioned in the web closer to the center in the material axis direction than one or more horizontal stiffeners, It has, The thickness of one or more horizontal stiffeners and the thickness of one vertical stiffener are equal to each other. The stiffening beam according to claim 1, wherein the steel grades of the steel materials forming one or more horizontal stiffeners and the steel grades of the steel materials forming one vertical stiffener are equal to each other.

3. The stiffener group has a plurality of vertical stiffeners arranged to intersect in the direction of the material axis, The spacing between the plurality of vertical stiffeners in the material axis direction is constant. The thicknesses of the aforementioned plurality of vertical stiffeners are equal to each other. The stiffening beam according to claim 1, wherein the steel types of the steel materials forming the plurality of vertical stiffeners are equal to each other.

4. The aforementioned one or more horizontal stiffeners include two horizontal stiffeners, The aforementioned one vertical stiffener is joined to the web, A stiffening beam according to claim 2, satisfying equations (3) and (4). 375<F...(3) 3.0≦H / B...(4) However, H is the beam depth of the steel beam.

5. The one or more horizontal stiffeners include one horizontal stiffener, The aforementioned one vertical stiffener is joined only to the web and not to the upper flange and the lower flange. A stiffening beam according to claim 2, satisfying equations (5) and (6). 375<F...(5) H / B<3.0...(6) However, H is the beam depth of the steel beam.

6. The aforementioned one vertical stiffener is joined to the upper flange and the lower flange, A stiffening beam according to claim 4, satisfying equations (7) and (8). 375<F...(7) 3.0≦H / B...(8)

7. The aforementioned one vertical stiffener is joined to the upper flange and the lower flange, A stiffening beam according to claim 4, satisfying equations (9) and (10). 375<F...(9) H / B<3.0...(10)

8. The stiffening beam according to claim 1, At least one end of the aforementioned steel beam is joined to a column, A beam-column joint structure equipped with this feature.

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