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21 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Concrete bridges |
Increased cross section (Inc moment of inertia) Post tensioning (reduces tensile strength & stresses) Clamping (adds stirrups externally) Stitching (overbridging cracks) |
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Metallic structures |
Cover plates( welded or bolted); welded to flanges or web; bolted to flanges Addition of new members (ensure carrying capacity) Confinement with reinforced concrete (jack up structure- most applicable to columns) |
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Masonry arch |
Concrete saddle (replace existing fill) Prefabricated liners (structural lining installed beneath arch) Retro- reinforcement (Installation of additional structural reinforcement to the arch to increase structural capacity) |
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Fracture mechanics |
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Methods of fatigue inspection |
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Dpi |
Liquid applied to the surface which is drawn to the surface through a white powder. |
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Methods for fatigue repair |
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Higher the discount value |
The lesser is the present value of the future cost |
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Fatigue in welded details |
Pre existing flaw(microscopic cracks) that can expand Stress conc expected at position of the locally changing geometry High residual stress |
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Value you get from the hand out is |
Delta note- fatigue limit |
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Frp |
High performance fibre contained in a resin matrix |
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Types |
Carbon (CFRP) Aramid (AFRP) Glass (GFRP) |
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5 different types of resin |
Phenolics- good fire resistance Polyesters- good general props/odour issues Poly- urethanes-good abrasion prop/poor temp performance Vinyl-esters- good fatigue/odour problems E-poxies- best resistance/ expensive |
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Issues with frp |
No codes Relatively new No idea how to examine in the future |
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Fibres |
Aramid- toughest Glass - economical Carbon- stiffest |
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Why are frps used |
Light/soft/stiff/ durable Aesthetic Good in fire Retrospective strengthening Replacement of components |
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AIP DOC |
Drafted by designer and reviewed by TAA (TECHNICAL APPROVAL AUTHORITY) |
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AIP KEY COMPONENTS |
Location Structure Loads Analysis Geotech Checks Sig of authority and designer's Technical approval schedule |
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Bridge scour analysis |
1. Field inspection 2. Hydraulic analysis 3. Hydrologic analysis 4. Sediment transport 5. Scour analysis 6. Risk estimation |
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Scour risk management |
1. Anticipation 2. Assessment 3. Prevention measures 4. Preparation for emergency situation 5. Response 6. Recovery |
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Scour risk assessment |
1. Data collection 2. Initial assessment (qualitative data) 3. Detailed assessment (quantitative data) 4. Long term management |
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