... 10 18.4 3.630 1 .2 0.9 3. 92 Lớp 3 4,9 0.095 11 20 7.9 2 0.9 14 .22 12 22 8 .2 2 0.9 14. 72 13 23 .45 8.38 0.9 0.9 6.79 70.80 ⇒ Qtc = 1.( 0,7.0,09.910,67 + 1 ,2. 70,77) = 1 42, 3(T) Vậy sức chịu ... 3 6.5 0.6 2 0.9 1.08 4 8.05 0.6 1.1 0.9 0.59 Lớp 2 10.4 0.435 5 9.6 3.135 2 0.9 5.64 6 11.6 3 .24 9 2 0.9 5.85 7 13.6 3.367 2 0.9 6.06 8 15.6 3.4 82 2 0.9 6 .27 9 17 .2 3.567 1 .2 0.9 3.85 10 ... • Lớp 2 : σ’v2 = 41 ,25 +5,61.3,55+9.19.5 ,2= 108,95 KN/m 2 fs2 = 38,9+(1 – sin 20 ,08). 108,95.tan 20 ,08 =65,05 KN/m 2 • Lớp 3 : σ’v3 = 108,95+9,19.5 ,2+ 9,08 .2, 45=179 KN/m 2 fs3 = 56,8+(1-sin...