PROFIS ENGINEERING
Table 12. Nominal Steel Strength in Tension( N sa) N sa = ESR value ESR-4266 Table 4
N sa = 41,365 lb / anchor
Nominal Concrete Breakout Strength in Tension( N cbg)
N cbg =
A ACI 318-19 Eq.( 17.6.2.1b) Nc ψ A ec, N ψ ed, N ψ c, N ψ cp, N N b Nc0 h ef = 5.75 in 1.5h ef = 8.625 in 3.0h ef = 17.25 in
A Nc =( c x- + s x1 + s x2 + s x3 + c x +)( c y- + s y12 + s y23 + s x34 + c y +) =( 8.625 + 9.0 + 9.0 + 9.0 + 8.625)( 8.0 + 6.0 + 6.0 + 6.0 + 8.625) = 1532.16 in 2 c x- = ∞ in = 1.5h ef
ACI 318-19 Fig. R17.6.2.1 b) c x + = ∞ in
= 1.5h ef c y- = 6 in
s x1 = 9 in s x2 = 9 in s x3 = 9 in s y12 = 6 in s y23 = 6 in s y34 = 6 in
A Nc0 = 9( h ef) 2 = 9( 5.75 in) 2 = 297.56 in 2 ACI 318-19 Eq.( 17.6.2.1.4)
ψ ec, N =
1 1 + e ′ N
1.5h e f
ACI 318-19 Eq.( 17.6.2.3.1) c y + = ∞ in = 1.5h ef ψ ec, N = 1.0 no eccentricity e’ N = 0 in 1.5h ef = 8.625 in ψ ed, N = 0.7 + 0.3 c a, min 1.5h e f
ACI 318-19 Eq.( 17.6.2.4.1b) ψ ed, N = 0.7 +( 0.3)(( 8.0 in / 8.625 in) = 0.978 c a, min = c y- = 8.0 in 1.5h ef = 8.625 in
ψ c, N = 1.0 cracked or uncracked concrete Reference ACI 318-19 17.6.2.5.1
ψ cp, N = MAX c a, min | 1. 5h e f
= 1.0 cracked concrete Reference ACI 318-19 17.6.2.6.1. c ac c ac
N b = k c, xxxx λ a f ′ c h e f
1.5
normal weight concrete: λ = 1.0 → λ a = 1.0 N b =( 21)( 1.0)( 4000 psi) 0. 5( 5.75 in) 1. 5 = 18,313 lb
N cbg =
A Nc A Nc0 ψ ec, N ψ ed, N ψ c, N ψ cp, N N b
N cbg =( 1532.16 in 2 / 297.56 in 2)( 1.0)( 0.978)( 1.0)( 1.0)( 18,313 lb) = 92,221 lb
ACI 318-19 Eq.( 17.6.2.2.1) ACI 318-19 Table 17.2.4.1 k c, cr = 21 Reference ESR-4266 Table 4 f ' c = 4000 psi h ef = 5.75 in
A Nc = 1532.16 in 2 A Nc0 = 297.56 in 2 ψ ec, N = 1.0 ψ ed, N = 0.978 ψ c, N = 1.0 ψ cp, N = 1.0 N b = 18,313 lb
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