JP2020200759A5 - - Google Patents

Claims (5)

Both ends are rigidly joined to the column, and the floor slab is joined to the upper flange of the steel beam via a stud with a head as a joining member, and the floor slab is continuous on one side in the direction perpendicular to the beam axis. On the other side is a steel beam with a floor slab that is not continuous and has an edge.
At least 20% of the range of the beam length from the beam end lower total sigma _s A _c of the effective projected area during withdrawal of the headed stud is disposed (except those in the range of beam full length) formula (1) The headed studs that satisfy the above conditions and are arranged outside the range are steel beams with floor slabs in which floor slabs are joined to both sides of the upper flange of the steel beam in the direction orthogonal to the beam axis via headed studs. The number of headed studs required as a fully composite beam under the load conditions under seismic load is less than the pitch when arranged at equal intervals over the entire length, and at least 20% from the beam end satisfying the following equation (1). Steel beams with floor slabs characterized by being placed at a pitch greater than the pitch of the headed studs placed in the range of.
Σ _s A _c ≧ 1.2 × _b N × _b A _c・ ・ ・ (1)
However, _b A _c : At the time of pulling out one headed stud in the steel framed beam with floor slab where floor slabs are joined via headed studs on both sides in the direction perpendicular to the beam axis at the upper part of the upper flange of the steel frame beam. Effective projected area
_b N: Required as a fully composite beam under the load conditions at the time of seismic load in a steel beam with floor slabs in which floor slabs are joined via headed studs on both sides in the direction perpendicular to the beam axis at the upper part of the upper flange of the steel beam. Of the number of headed studs, the number of headed studs required in the same range as the range in which the headed studs are arranged so as to satisfy the equation (1). The height of the headed stud, which satisfies the equation (1) and is arranged in a range of at least 20% of the beam length from the beam end (excluding those having a beam total length as a range), is arranged outside the range. The steel beam with a floor slab according to claim 1, wherein the height is higher than the height of the headed stud. The steel frame beam with a floor slab according to claim 1 or 2, wherein the reinforcing bars are arranged in the direction orthogonal to the beam axis in the range in which the headed studs are arranged so as to satisfy the equation (1). .. In the range where the floor slab is a reinforced concrete floor slab and the headed studs are arranged so as to satisfy the equation (1), reinforcing bars are arranged in two or more steps in the direction perpendicular to the beam axis, and in each step. The steel beam with a floor slab according to claim 3, wherein the total cross-sectional area of the reinforcing bars Σ _s A _{r satisfies the following equation (2).}

here,
_sc a: Shaft cross-sectional area of stud with head
F _c : Concrete strength
E _c : Young's modulus of concrete
_s Q _s : Shear strength of headed studs determined by fracture of headed studs or concrete
_r σ _y : Yield stress of reinforcing bar
_s N: Number of headed studs arranged to satisfy equation (1)
A _qc : Effective projected area of the headed studs arranged so as to satisfy the equation (1) with respect to the shearing force when the headed studs come out. In the range where the floor slab is a synthetic deck floor slab and the headed studs are arranged so as to satisfy the equation (1), reinforcing bars are arranged in one step in the direction perpendicular to the beam axis, and the reinforcing bars are arranged in one step. The steel beam with a floor slab according to claim 3, wherein the total cross-sectional area of Σ _s A _{r satisfies the following equation (2).}

here,
_sc a: Shaft cross-sectional area of stud with head
F _c : Concrete strength
E _c : Young's modulus of concrete
_s Q _s : Shear strength of headed studs determined by fracture of headed studs or concrete
_r σ _y : Yield stress of reinforcing bar
_s N: Number of headed studs arranged to satisfy equation (1)
A _qc : Effective projected area of the headed studs arranged so as to satisfy the equation (1) with respect to the shearing force when the headed studs come out.