TBDY için narinlik kontrolü olarak geçen bu hesabın, raporunun da US'e göre düzenlenmesi gerekmektedir.
The width-to-thickness ratios of steel elements are automatically controlled and reported with steel elements reports according to Table D1.1.
Symbols
Fy = Specified minimum yield stress
Ry = Ratio of the expected yield stress to the specified minimum yield stress, Fy
Rt = Ratio of the expected tensile strength to the specified minimum tensile strength, Fu
Pa = Required axial strength using ASD load combinations, kips (N)
Pu = Required axial strength using LRFD load combinations, kips (N)
Py = Axial yield strength , kips (N)
Ca = Ratio of required strength to available axial yield strength
E= Modulus of elasticity of steel = 29,000 ksi (200 000 MPa)
Local buckling can result in very high localized strains that when repeated, such as in low-cycle fatigue caused by an earthquake, can result in premature fracture of a member that is intended to behave in a ductile manner. In order for horizontal load-bearing system elements to perform sufficient plastic deformation under earthquake effects without local buckling, the width-to-thickness ratios of compression elements must meet the conditions given in the table.
Since the plastic deformation capacity of systems with high ductility level should be relatively higher, the cross-sectional conditions that the elements that make up these systems must meet are also more restrictive.
