ASSESSMENT OF RESIDUAL LIFE OF GIRDERS OF BRIDGE No

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Weight of 60 Feet Span (double) 2x8260 = 16520.0 Kg Add 2% for rivetting = 330.4 Kg Total = 16850.4 Kg Say = 17 t Add 5% = 0.85 t (4% for bearing and 1% for any missed member) Total = 17.85 t Say = 18 t Track wt. 0.4 t/m = 7.58 t Total = 25.58 t Total Area = 503.35 cm 2 Deduction for rivets 4x2.54x1.0 = 10.16 cm 2 Net Area = 493.19 cm 2 Ixx = 1/12 x (508 x32 3 + 457 x 32 3 ) + 508 x 32 x (794 -16) 2 + 457 x 32 x (794 -16) 2 + 1/12 x 10 x 1524 3 + 4 x { 2800000 + 2200 x (1524/2 - 33.2) 2 } Ixx = 26328791605 mm 4 Ixx = 2.63287 x 10 10 mm 4 Ixx = 2.63287 x 10 6 mm 4 Y’ = 794 mm = 79.4 cm Dead Load = 25.58 t = 255.8 KN DL+LL+IL = 2984.8 KN B.M(DL) = WL/16 = 255.80 x 1000 x 1830/16 2.92571 x 10 7 Ncm B.M(DL+LL+IL) = WL/16 = 2984.80 X 1000 X 1830/16 3.41386 X 10 8 Ncm Stress(min) = BM(DL) x Y’/Ixx = 8822.33 N/cm 2 = 8.8233 N/mm 2 Stress(max) =BM(DL+LL+IL) x Y’/Ixx =10295.53 N/cm 2 = 102.9553 N/mm 2 Stress(T) = Stress(max) x A gross/A net =102.95 x 503.35 / 483.16 = 105.07 N/mm 2 Stress range = Stress(T) – Stress(min) = 105.07 – 8.82 = 96.25 N/mm 2 Effective length L’ = 18.3 m 28
REFERENCES: 29 Annexure – III 1. Estimation of the residual life of floor system of Ganga Bridge near Balawali ( Civil Engineering Report No. 175 ) 2. Investigations on the assessment of residual life of early steel/wrought iron girder bridges ( Civil Engineering Report No. 245 ) 3. Assessment of fatigue life of early steel/wrought iron girder bridges ( Report No. BS-5 ) 4. Guidelines for assessment of residual life of early steel/wrought iron girder bridges ( Report No. BS-39 ) 5. Statistical distribution of axle loads and stresses in railway bridges ( ORE Report No.1 Question D-128 ) 6. Fatigue life of riveted railway bridges by Bjorn Akesson, Chalmers university of technology, Sweden . 7. Condition monitoring and life assessment of railway bridge 449/3/34 over river Tapti near Bhusaval by Department of civil engineering IIT, Mumbai 8. Assessment of residual fatigue life of Ganga bridge near Kanpur, N. Rly. ( Report No. BS- 70 & 75 ) 9. Code of practice for fatigue ( BS-5400: Part 10 )
Page 1 and 2: Ministry of Railways Government of
Page 3 and 4: INDEX S.No Contents Page no. 1. Int
Page 5 and 6: 11x 48.5 m spans in bridge No. 75 w
Page 7 and 8: d) The fatigue life of standard spa
Page 9 and 10: slowly before failure, which shows
Page 11 and 12: k1 = ------------------------------
Page 13 and 14: Life = 120 / k1 m = 594 years Remai
Page 15 and 16: 15 Table -1 RU Loading : Annual tra
Page 17 and 18: Year GMT during the GMT Cum. GMT du
Page 19 and 20: Stress range in N per sq mm 1000 10
Page 21 and 22: No. of cycles 70 60 50 40 30 20 10
Page 23 and 24: 1. The Vasai Creek is spanned by br
Page 25 and 26: vii) The girders are having sliding
Page 27: WEIGHT CALCULATION Calculation shee

ASSESSMENT OF RESIDUAL LIFE OF GIRDERS OF BRIDGE No

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