≤ 45 ≤ 500000 1.15 = 103 2 GRAPHENE: ≤ 45 ≤ 800000 1.30 = 73 2 ≤ 45 ≤ 1000000 1.15 = 51 2 Where: = Factored nominal anchor load. = Cross-sectional area of the tendon. = Ultimate tensile strength of the tendon steel. = Yield strength of the tendon steel. = Coefficient depending on the service life of the anchor. = Coefficient depending on the service life of the anchor. 4.1.3 Calculation of Anchor Diameter Where: = Cross-sectional area of the tendon. D = Diameter of the anchor bar. STEEL: = 4 D2 D= ට4 D= ට4(106 2) = 11.6 GRAPHENE: = 4 D2 D= ට4 D= ට4(73 2) = 9.6 4.1.4 Verification of Anchor–Grout Slip = 6.9( 22.5) ⁄ 2⁄3 = 6.9(21 22.5) ⁄ 2⁄3 =6.59 ( . ) ≤ 1,2 Where: = Factored nominal load of each anchor. = Nominal perimeter of the tendon (π·D). = Cross-sectional area of the tendon. = Bond length (bulb length). = Ultimate bond stress between tendon and grout (MPa). = 28-day compressive strength of grout (MPa). 4.1.5 Calculation of Allowable Soil Bond Strength = í 3 = 0.124 1 .65 = 75.2 Where: = Allowable bond stress. í = Ultimate bond stress. 3 =Partial factor depending on anchor type. Elastic Limit State Shear Stress Verification Ultimate Limit State Elastic Limit State
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