X 2918777 x 6460 235691240 nmm 0326 x 2918777 951521

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Unformatted text preview: 97) = -0.4644 N/mm2 Net compressive stress: = (+0.484 1)+ (+0.019 7)= +0.503 8 N/mm2 H 1.00 — ‘— = 0.5040 B, 1.984 C,= 0.4723 W,=(C, XK, XB<) = 0.4723 X 15700 x (1.984)2 W,= 29187.77 N/m WI = 682876.20 == 1410667 Stress due to thrust G-4.1O.4 Stress Due to Live Load = 0.121 x 8736.23 x 646.0 Moment (M) = 682876.20 Nmm = 0.125 x 10388.8 x 646.0 = 838895.60 Nrnm 19 IS 784:2001 -1.150 x 1200 = 0.326 x 10388.8 = 3386.75 Nlrn Stress due to moment: Thrust (T) M 1410667 c) At working pressure = 0.5947 N/mm* –PW x D Stress due to thrust: f. T 3886.75 —. = 0.0368 N/mm2 A 92000 Net tensile stress: = (-0.5947)+ (+0.0368)= -0.5579 N/mmz Net compressive stress : = (+().5947)+ (+().()368)= +0.631 5 N/mm’ G-4.12 Summary of Circumferential b) At site test –P, x D A,)] PRESTRESS REQUIREMENTS (see 7.4.3) Circumferential Stresses in Nlmm2 Loading Combination .~ Tensile — / \ Permissible Actual b) Site test condition (Self weight + Weight of water+ Earth fill load + Site test press Final prestress) Compressive Nlmm2 a) External Loads •I-0,5038 – 0.4644 Self weight of pipe + 0.5935 – 0.6599 Weight of water + 1.7742 – 1.5674 Weight of earth fill + 0.6315 – 0.5579 Live load b) Internal Pressure -8.6166 — Site test pressure – 5.7444 — Working pressure -9.4372 — Factory test pressure c) Compressvie Stress in Core Due to CircumferenWinding tial +11.447 6 Initial compressive stress — + 9.9405 Prestress at factory test — + 9.7731 Prestress at site test — N/mmz Circumferential pre-stressing condition Self weight + Initial prestress Stresses Tensile N/mm2 Stresses Due To = 2 XPO+(5 X0.623)] a) = –5.7444 N/mmz fw -1.150 x 1200 G-5 CIRCUMFERENTIAL –0.700 x 1200 2x~O+(5x0.623)] a) At factory test fws= 2x[~+(nx = w] . G-4.1 1 Calculation of Stresses in Pipe Core Due to Internal Pressure fw~= -9.4372 0.623)] fW,= -8.6166 N/mm2 838895.60 7= = 2 x~+(5x — — Compressive . / 0.13 ~ck)0”67 =o.13 x (40)0”67 =-1.54 - (0.464 4 + 0.6599 + 1.5674 + 8.6166)+ 9.7731 = -135.52 – 1.5352 < 20 0.55 x fp2 0.55 x 25 = 13.7500 (0.503 8 + 11.4476) =11.9514 < 13.7500 0.45 x ~k = 0.45 x 40 = 18.0 (0.503 8 + 0.5935 + 1.7742 + 9.773 1) =+12.6446 + 12.6446 -1.54 Permissible Actual + 11.9514 Y < 18.0 IS 784:2001 Circumferential Stresses in N/mm2 Loadi)/g Combination - / Tensile - \ Permissible Actual c) Factory test condition (Self weight + Weight of water+ Factory test pressure + Prestrcss at factory test ) -(0.464 4 + 0.6599 + 9.437 2)+ 9.9405 =-0.6210 -0.6210 d) Operating condition (Self weight + Weight of water+ Earth fill load + Working pressure final prestress) e) Live load condition [Operating condition live load (with impact)] (t ,, =40 N/mm’, -(0.464 4 + 0.6599 + 1.5674 + 5.744 4)+ 9.7731 = +1.337 o + 1.3370 ~,= Between Centreline spacing between . +12.644 6 0.13 (j&)”’c’ 0.13 x (40)0’67 =–-1.54 < < 18.0 0.45 ‘jk = 0.45 x 40 = 18.0 < 18.0 = 279288.24 mm2 Longitudinal precompression = Longitudinal precompression N x Ad...
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This document was uploaded on 10/01/2013.

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