Bridge engg mechanism and hydraulics.ppt
- 2. Purpose of bridgeIRC:5-1998 (sec-I)-cls101) • A bridge is a structure providing passage over an obstacle without closing the way beneath. • The required passage may be for a road, a railway, pedestrians, a canal or a pipeline. • The obstacle to be crossed may be a river, a road, railway or a valley.
- 3. Component of Bridge Structures
- 5. 4.Classification of bridges (According to the position of the bridge floor relative to superstructures) •Deck through bridge •Half through or suspension bridge
- 6. 5.Classification of bridges (According to method of connection of different part of superstructures) •Pinned connection bridge •Riveted connection bridge •Welded connection bridge
- 7. 6.Classification of bridges (According to length of bridge) •Culvert bridge(less than 6 m) •Minor bridge(less than 6 m-60m) •Major bridge(more than 60 m) •Long span bridge(more than 120 m)
- 8. 8.Classification of bridges (According to anticipated type of service and duration of use) •Temporary bridge •Permanent bridge
- 9. 9.Classification of bridges (According to function) • Aqueduct bridge(canal over a river) •Viaduct(road or railway over a valley or river) •Pedestrian bridge •Highway bridge •Railway bridge •Road-cum-rail or pipe line bridge
- 10. 10.Classification of bridges (According to road level relative to the highest flood level of the river below ) •Highlevel bridge •Submersible bridge
- 11. 11.Classification of bridges (According to clearance for navigation) •High level bridge •Movable -bascule bridge •Movable -swing or transporter bridge
- 13. ARCH BRIDGE
- 18. Deck slab and T-Beam bridge
- 19. SELECTION CRITERIA FOR BRIDGE SITE • For selecting a suitable site for a major bridge, the investigating engineer should make a reconnaissance survey to get impression of the landscape and to decide on the type of the structure to the site. • Care should be taken to investigate a number of probable alternative sites and then decide on the site which is likely to serve the needs of the bridge at the least cost. • A brief description of the reasons for the selection of a particular site should be furnished in the investigation report along with sailent details of alternative sites investigated and rejected