Check For Stresses during Lifting process
Support Sec Mid Sec
0.280 m 1.900 m 3.475 m 3.400 m 6.950 m 10.425 m 13.900 m
Outer Girder G1
Girder selfweight
Actual Moment KN-m 0.00 497.89 665.78 675.78 1314.62 1636.13 1743.30
Change in moment on
KN-m 0.00 547.68 732.35 743.35 1446.08 1799.75 1917.63 increased
10%
account of change in gravity
during lifting process KN-m 0.00 448.10 599.20 608.20 1183.16 1472.52 1568.97 decreased
0.00 2.07 3.29 3.34 6.50 8.08 8.61
GT M yt / Iz 0.00 1.70 2.69 2.73 5.31 6.61 7.05
(Mpa)
0.00 -2.13 -3.19 -3.23 -6.29 -7.83 -8.34
GB -M yb / Iz 0.00 -1.74 -2.61 -2.65 -5.15 -6.41 -6.83
Prestress + Elastic Shortening
GT -1.60 -3.92 -3.89 -3.81 -6.00 -6.79 -6.88 stress taken from
(Mpa) outer Girder G1
GB 13.26 15.65 21.55 21.47 23.61 24.39 24.51 stress check portion
Prestress + Self Weight + Elastic Shortening
-1.60 -1.84 -0.60 -0.47 0.49 1.29 1.73
GT -1.60 -2.22 -1.20 -1.08 -0.69 -0.18 0.17
(Mpa)
13.26 13.52 18.36 18.24 17.31 16.56 16.17
GB 13.26 13.91 18.94 18.83 18.46 17.99 17.69
Max Stress 18.94 <= 24.00 OK
(Mpa)
Min Stress -2.22 >= -3.50 OK
Outer Girder G6
Girder selfweight
Actual Moment KN-m 471.79 863.89 1323.38 1768.68 2092.29 1768.68 2092.29
Change in moment on KN-m 518.96 950.27 1455.71 1945.55 2301.52 1945.55 2301.52 increased
account of change in gravity 10%
during lifting process KN-m 424.61 777.50 1191.04 1591.81 1883.06 1591.81 1883.06 decreased
1.97 3.60 6.54 8.74 10.34 8.74 10.34
GT M yt / Iz 1.61 2.94 5.35 7.15 8.46 7.15 8.46
(Mpa)
-2.02 -3.69 -6.33 -8.46 -10.01 -8.46 -10.01
GB -M yb / Iz -1.65 -3.02 -5.18 -6.93 -8.19 -6.93 -8.19
Prestress + Elastic Shortening
GT 6.05 2.95 2.99 0.00 -1.95 0.00 -1.95 stress taken from
(Mpa) outer Girder G4
GB 6.87 10.09 17.19 20.15 22.12 20.15 22.12 stress check portion
Prestress + Self Weight + Elastic Shortening
8.01 6.55 9.53 8.74 8.39 8.74 8.39
GT 7.66 5.89 8.34 7.15 6.51 7.15 6.51
(Mpa)
4.86 6.40 10.86 11.69 12.11 11.69 12.11
GB 5.22 7.07 12.01 13.23 13.93 13.23 13.93
Max Stress 13.93 <= 24.00 OK
(Mpa)
Min Stress 4.86 >= -3.50 OK
Inner Girders G2 To G5
Girder selfweight
Actual Moment KN-m 3.90 472.00 878.10 1748.30 2291.00 1748.30 2291.00
Change in moment on
account of change in gravity KN-m 4.29 519.20 965.91 1923.13 2520.10 1923.13 2520.10 increased
10%
during lifting process KN-m 3.51 424.80 790.29 1573.47 2061.90 1573.47 2061.90 decreased
0.02 1.97 4.34 8.64 11.32 8.64 11.32
GT M yt / Iz 0.01 1.61 3.55 7.07 9.26 7.07 9.26
(Mpa)
-0.02 -2.02 -4.20 -8.37 -10.96 -8.37 -10.96
GB -M yb / Iz -0.01 -1.65 -3.44 -6.85 -8.97 -6.85 -8.97
Prestress + Elastic Shortening
GT 7.37 4.04 3.90 0.60 -1.49 0.60 -1.49 stress taken from
(Mpa) inner Girder stress
GB 6.17 9.62 17.33 20.60 22.71 20.60 22.71 check portion
Prestress + Self Weight + Elastic Shortening
7.39 6.01 8.24 9.24 9.84 9.24 9.84
GT 7.39 5.65 7.45 7.67 7.78 7.67 7.78
(Mpa)
6.15 7.61 13.12 12.23 11.74 12.23 11.74
GB 6.15 7.97 13.89 13.75 13.74 13.75 13.74
Max Stress 13.89 <= 24.00 OK
(Mpa)
Min Stress 5.65 >= -3.50 OK
Reaction at one End due to girder self weight = 275.12 KN
Jacking force of one strand of 12T13 type prestressing strands = 139.5973 KN
Provide 5 strands of 12T13 type prestressing strands at each end for lifting purpose
So, total jacking force of five strands of 12T13 type prestressing strands = 697.9867 KN
Percentage of strength used of 12T13 type strands = 78.83% (100% impact is being considered for girder
during launching process)
