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For example,
SB001 BASE STORY Inadequate lateral bracing of steel beamLateral bracing check is not satisfied.
In steel structural system beams with high ductility level and normal ductility levelof special moment frames and intermediate moment frames, in accordance with TBDY Chapter 9 and AISC 341-16 regulations, the lower and/or upper headings of the steel beams must be supported against lateral buckling to meet the conditions given in the regulationsand TBDY Chapter 9 codes, both flanges of members should be laterally braced, or the beam cross-section should be braced with point torsional bracing.
As stated in TBDY 9.2.8;
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AISC 341-16 D1 2b;
The maximum spacing of bracing for highly ductile beams should satisfy the following requirements.
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The greatest distance between lateral support elements in beams of seismic load-bearing systems designed as elements with limited ductility level will meet the following conditionmaximum spacing of bracing for moderately ductile beams should satisfy the following requirements.
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Solutions:
Lateral retention length The lateral bracing distance can be reduced by connecting roof braces (horizontal braces) and stability elements to the steel beam whose name and floor are given.Lateral
retention length The lateral bracing distance can be reduced by connecting defining secondary steel beams or beams that will provide and stability elements to the steel beam whose name and floor are given.
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icons
Lb : Distance Length between the points where the pressure head is supported in the lateral direction or where points that are either braced against lateral displacement of compression flange or braced against the twist of the cross-section is supported against distortion , in. (mm)
E : Elasticity modulus Modulus of elasticity of structural steel steel = 29,000 ksi (200 000 MPa)
Fy : Characteristic Specified minimum yield stress of structural steel
i , ksi (MPa).
Ry : Radius of inertia with respect to the weak axis of the beam cross-section Ratio of the expected yield stress to the specified minimum yield stress, Fy
ry : Radius of gyration about y-axis, in. (mm)
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