Ngày tải lên :
16/08/2015, 15:55
... 125 40 δ = 0, 5 − 0, 01 − 0, 01 Rb = 0, 5 − 0, 01 − 0, 01 ×11,5 = 0, 176 h 600 eo/h = 446/ 600 =0, 743; δe= max(eo/h;δmin)= max (0, 743 ;0, 176)= 0, 743 S= 0, 11 0, 11 + 0, 1 = + 0, 1 = 0, 23 δe 0, 743 0, 1 + 0, 1 ... tích cốt thép: As = Rb bx + Rsc As' − N 11,5 × 400 × 102 + 2 80 × 1159 − 8 90 × 103 = = −55(mm ) Rs 2 80 ⇒µ= −55 × 100 % = 0. 025% < µmin = 0, 2% 400 × 5 60 Do lấy theo cấu tạo, As = µminbh0 = 0, 002 × 400 ×5 60= ... − × 0, 216 = 0, 309 1223 × 100 % = 0, 556% > µmin = 0, 20% 400 × 5 50 1223 + 2 70 µt = × 100 % = 0. 664% < 3,5% 400 × 5 50 µ= x= ξh0 = 0, 39×5 50 = 1 70 > 2a’ = 100 (mm) Diện tích cốt thép: Rbbx + Rsc As'...