Download Current and Future Trends in Bridge Design, Construction and by Institution of Civil Engineers, Highways Agency, PDF

By Institution of Civil Engineers, Highways Agency, International Association for Bridge Maintenance, Parag C. Das, Dan M. Frangopol

The establishment of Civil Engineers has organised a chain of meetings to rejoice, firstly of the recent Millennium, the large achievements made within the box of bridge engineering lately.

This quantity of papers from the second one of those meetings, held in Hong Kong, encompasses the cutting-edge in bridge layout, development, upkeep and security evaluation. It comprises papers on significant bridge schemes, either accomplished and lower than building, and on leading edge methods utilized in a number of elements of the realm.

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Extra info for Current and Future Trends in Bridge Design, Construction and Maintenance 2: Safety, Economy, Sustainability, and Aesthetics

Sample text

8 33 A B Fatigue Life (Mcycles) Crack Length min Nd 2bd (mm) 16. 8 12. 9 12. 1 4. 59 26. 6 16. 5 6. 1 Stress Range A a (MPa) eq 24. 18. 17. 17. 6 8 7 3 U. 8 Nf 24. 76. 60. 44. 7 3 3 6 10 7 20 16 Table 3 Variable Amplitude Fatigue Test Results (PP Specimen) Specimen No 1 Load range APmax (kN) 176 Stress RangeA a (MPa) Section A B Fatigue Life (Mcycles) Crack Length max eq min Nd Nf 2bd (rain) 63. 9 49. 3 33. 5 26 22. 8 17. 7 65. 1 109. 7 86. 6 153. 1 Crack Initiation and Propagation Behaviour Figures 9-14 show fatigue cracks and fracture surfaces for each type of specimen.

9 33. 8 33 A B Fatigue Life (Mcycles) Crack Length min Nd 2bd (mm) 16. 8 12. 9 12. 1 4. 59 26. 6 16. 5 6. 1 Stress Range A a (MPa) eq 24. 18. 17. 17. 6 8 7 3 U. 8 Nf 24. 76. 60. 44. 7 3 3 6 10 7 20 16 Table 3 Variable Amplitude Fatigue Test Results (PP Specimen) Specimen No 1 Load range APmax (kN) 176 Stress RangeA a (MPa) Section A B Fatigue Life (Mcycles) Crack Length max eq min Nd Nf 2bd (rain) 63. 9 49. 3 33. 5 26 22. 8 17. 7 65. 1 109. 7 86. 6 153. 1 Crack Initiation and Propagation Behaviour Figures 9-14 show fatigue cracks and fracture surfaces for each type of specimen.

The degree of redundancy also needs to be considered. Structures where failure of one member would not cause complete collapse, are less at risk than those with no redundancy. Structures that are particularly vulnerable, are those that use segmental construction or which rely on post-tensioned tie down tendons. Finally the results of previous inspections should be examined to determine whether there is any evidence of distress. The reports should be reviewed for any evidence of water leakage through the structure, ingress of chlorides, rust staining or cracking, particularly along the line of the ducts.

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