λ1= 0.95 λ2= 0.85 λ3= λ4=
41.1 40.1 40.4 43 41.3
40.7 40 39.9 39.9 41.2
42 40.7 40.3 40.1 42.1
41.7 40.7 40.6 39.6 40.6
41.5 40.7 41.3 42.2 40.4
42.6 40.5 42.1 41.1 40
41.8 40.8 41.2 40.4 40.3
43.1 40.6 41.5 41.5 39.8
40.5 41.3 41.2 41.5 40.4
41 41.2 40.8 42.5 41
42.6 39.9 40.2 41.2
42.5 41.1 42.9 41.2
△ ▲ △
41.1 ≥ 37.38 ≥
39.6 ≥ 29.75 ≥
参加人员
mfcu≥fcu.k +0.7 σ 0
f cu.min ≥fcu.k -0.7 σ 0
当强度等级≤ C20