Spacing between longitudinal wires 3141 6 x 5003516

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Unformatted text preview: .7422 N/mm2 At site test Stress in longitudinal wire after losses, ~1 = 1286.25-212.63 = 1073.62 N/mm2 16X 12.57 ~il Final precompression, &l = ~1 = 3.6705 Initial precompression, ~il = D-3.5 Longitudinal Winding = 4.3975 N/mmz at detensioning D-3.6 Stress Due to Beam Action W,= 2295.62 N/m WW= 1963.50 N/m Self weight of pipe Weight of water Adopt ~Pl= 15 N/mm2 D-3.3 Loss of Stress in Longitudinal Stress Due to Circumferential = 0.284 x 10.6575 = 3.0267 N/mm2 that is, 2 x 4.3975 = 8.7950 or 15 N/mm2, whichever is greater Earth load to be considered (see 7.4.1) 2.2x(D+2x Tc+2x Tb) = 1350.80 N/m = 2.2 X 614 Wires (see Annex F) Relaxation of wire 0.08 x j,il = 0.08 x 1286.25 = 102.90 N/mm* b) Deformation due to creep 2.50 X~Cil 2.50 x 4.3975 = 10.99 N/mm2 = c) Deformation due to shrinkage 0.0001 x Es= 0.0001 x 20.0 x 104 = 20.00 N/mm2 d) Yield due to mould shortening, wire stretch due to filling, vibration during spinning, etc a) Total load W= W, + WW+ 1 350.80=5 609.92 N/m Modulus of circular section of pipe (Zl) 3.1416 x 6144-5004 =12 731728mJ 614 32 Bending moment (BM) @ —= 8 2xE. 5609.92 x5x5 xlo00 =17531000Nm 8 BA4 —=l.3769N/mm2 ‘tiess ‘Ue ‘0 bem action = z, Effective length of pipe + 80 mm D-3.7 Stress Due to Self Weight of Core = 78.74 N/mm* Self weight of core ( WC)= 1411.84 N/m = 5000+80 Modulus of circular section of core (Z2) Total losses = 102.90+ 10.99+ 20.0+ 78.74 = 212.63 N/mm2 3.1416 ~ 5704-5004 D-3.4 Precompression Direction N/mm2 Maximum local longitudinal tensile stress during winding of 2 x ~il OR 15 N/mm2, whichever is greater, 2X20 X104 1073.62 16X 12.57 X 1286.25 58826.46 Concrete strength required longitudinal, ~1 (see 8.3.2) X 58826.46 in Core in Longitudinal =7416520m3 32 570 B.M. due to mass of core (BM) At the stage of winding Loss of prestress in longitudinal wire at winding = Total losses x 0.9 =212.63 x 0.9= 191.37 N/mm2 Stress in longitudinal wire at winding (l,iW) = 1286.25 – 191.37~,lW 1094.88 N/mm2 = 1411.84 x5x5x 1OOO= 4411985Nm 8 BM Stre& due to self weight of core =~=iO.5949 2 14 N/rnni2 IS 784:2001 D-3.8 Stress Due to Transport Bending moment under 7.4.1) = 8.44 D-3.9 Summary of Stresses in Longitudinal Direction and Handling 107 (see Note 3 x Stresses due to Compressive Tensile N/mm2 N/mm2 Maximum local longitudinal — –3.026 7 tensile stress due to bending during winding Beam action –1.376 9 + 1.3769 Self weight of core + 0.5949 -0.5949 Transport and unloading + 6.6291 -6.6291 Initial precompression + 4.3975 — Precompression at winding +3.743 2 — Final precompression + 3.6705 — Modulus of circular section of pipe (Zl) 3.1416 32 6144-5004 x 614 =12 731 728mm3 Stress due to transport and handling = Bending Moment = 8.44 x 107 = + b 629 ~N, z, 12731728 -2 –“ D-3.1O Load Combination of Longitudinal Under Different Condition (see 7.4.1) Stresses Actual against Permissible . Loading Combination Longitudinal Stresses, Nlmm2 Tensile — / - Actual a) Longitudinal prestress in barrel (aft...
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