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TBDY için narinlik kontrolü olarak geçen bu hesabın, raporunun da US'e göre düzenlenmesi gerekmektedir. |
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The width-to-thickness ratios of steel elements are automatically controlled and reported with steel elements reports according to Table D1.1. |
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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)
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Local buckling can result in very high localized strains that , when repeated , such as in like low-cycle fatigue caused by an earthquake, can result in premature fracture of a member that is cause very high localized stresses that can cause premature failure of an element intended to behave in a ductile manner. In order for horizontal load-bearing structural system elements to perform achieve sufficient plastic deformation under earthquake effects without local buckling under the effects of earthquakes, the width-to-thickness ratios of the 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.
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Table D1.1.
The width-to-thickness ratios of steel elements are automatically controlled and reported with steel elements reports according to Table D1.1.