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Most of the types of bridges covered
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CLASSIFICATION OF BRIDGES AND IT’s
COMPONENTS
ACCORDING TO FUNCTION1)Track Bridge (for rail vehicle)
– Over water bodies i.e River/ Nallah /Canal– Over Valley (viaduct)– Over Railway (Fly-over)– Over Road (RUB)
2) Road Bridge (For Road Vehicle)– Over Railway (ROB)
3) Rail cum road bridge – Over river
4) Foot over Bridge (For pedestrian)– Over Railway (On platform for public)
5) Pipe Line Bridge - Over Railway
6) Aquduct
- Canal or Nallah over Track
ACCORDING TO MATERIAL OF CONSTRUCTION OF SUPER
STRUCTURE 1) Timber Bridge (obsolete)
2) Masonry Arch – Stone & Brick– In lime Mortar & Cement Mortar respectively
3) Steel Bridge – Riveted Fabrication– Welded Fabrication
4) RCC Bridge
5) Pre-stressed Concrete Bridge
6) Composite (Steel & Concrete) Bridge
ACCORDING TO FORM OR TYPE
OF SUPERSTRUCTURE
1) Pipe Culvert
2) RCC Slab
3) Rail opening (Only on branch line)
4) Rail Cluster (Only on branch line)
5) RCC Box Culvert
6) Steel Plate Girder
7) Steel Open Web Girder
8) Arch Bridge
9) RCC/PSC ‘T” or “I” Beam Bridge
10) RCC/PSC Box Girder
11) Suspension Bridge
12) Cable Stayed Bridge
13) Bow String Bridge
14) Moveable Bridge
ACCORDING TO STRUCTURAL CHARACTERISTICS OF
SUPERSTRUCTURE 1) Simply supported
2) Continuous
3) Cantilever
4) Balanced Cantilever
5) Cable Stayed
6) Suspension
7) Rigid Frame.
Arch Bridge
Bowstring Br
Cable Stayed Bridge
Suspension Bridge: Forces
Suspension Bridge
PLATE GIRDER
WEB PLATE
BEARING STIFFENER BOTTOM LATERAL BRACINGINTERMEDIAT STIFFENER
CLEAR SPAN
CENTRE OF BEARINGS
ELEVATION
PLATE GIRDER
PLAN
CROSS FRAME TOP LATERAL BRACING MAIN GIRDERS
CROSS
PLATE GIRDER
MAIN GIRDER
END CROSS FRAME
BEARING
BED BLOCK
CROSS SECTION
ACCORDING TO LEVEL OF FLOOR SYSTEMS
1) Deck Type – (Track Structure on Top Flange or Chord)
2) Through Type (Track structure Floor System Connected to Bottom Chord Panel)
3) Semi Through Type (Track Structure Floor System Connected to Web and no top Bracings)
SEMI THROUGH TRUSS
Warren Trusses
K-Truss
OPEN WEB THROUGH SPAN
ELEVATION
L0 L1 L2 L3 L4 L5 L6
21U U 43U U 5U
TOP CHORD
BOTTOM CHORD
VERTICALSDIAGONALSEND RACKER
TOP PLAN
KNEE PORTALTOP LATERAL BRACING
PORTAL
SWAY BRACINGS
PLAN AT FLOOR LAVEL
0L 21L L 43L L 65 LL
0L' L'1 L'2 L'3 L'4 L'L'5 6
MAIN GIRDERCROSS GIRDER BOTTOM LATERAL BRACINGSTRINGERS
STRINGER BRACINGS
Beam Bridge
MOVEABLE BRIDGES :
• Swing Bridge
• Bascule Bridge
• Lifting Bridge
Bascule Bridges
Swing Bridges
Lifting bridges
ACCORDING TO TYPE OF SERVICE
1) Permanent
2) Temporary– Restricted Head Girder (RH Girder)– Callender-Hamilton Bridge– Pantoon Bridge
Pontoon Bridges
Type of girder Span
1. Rail Cluster 3660mm (12’)
1 RH Girder(Plate girder type, duplicate girders)
a)1800mmb)7200mm (24’)c)9680mm(31’-9”)d)13200mm (44”)e)16400mm (53’-6”)f)26480mm (87”)
2. Calendar Hamilton Girder(open web through type)
a)24400mm (80’)b)30500mm (100’)c)45700mm (150’)d)61000mm (200’)
4. Standard Span(Plate girders)
a)12200mm (40’)b)18300mm (60’)c)24400mm (80’)
ACCORDING TO METHOD OF CONNECTION (STEEL GIRDER)
1) Riveted
2) Welded
3) Bolted
ACCORDING TO LEVEL OF DECKING
WITH REFERENCE TO HFL
1) High Level bridge
2) Causeway or Irish Bridge
3) Siphon Bridge
ACCORDING TO SPAN OR OPENING
1) Minor Bridge– Individual span < 12 m & Total Lineal Waterway< 18 m
2) Major Bridge – Individual span ≥12 M or Total Lineal Waterway ≥ 18 M
3) Important Bridges –– Total Lineal waterway 300 M OR – Total Waterway 1000M2 OR – Those classified as ‘IMPORTANT BY CE/CBE due to
their depth of W.Way, Extent of River Training Works & Past History Maintenance Problem.
ACCORDING TO RAILWAY GAUGE
1) Broad Gauge (BG – 1676 MM)
2) Metre Gauge (MG – 1000 MM)
3) Narrow Gauge (NG – 762 MM)
ACCORDING TO LOADING STANDARD
Broad Gauge– DFC– 25 T– MBG – 1987 (Modified Broad Gauge)– RBG – 1975 (Revised Broad Gauge)– BGML (Main Line)– BGBL (Branch Line)
MAIN ELEMENT OF BRIDGE
1) Superstructure – Track Structure– Girder– Bearing
2) Substructure – Bed Block– Training & Protective Works– Pier/Abutment/Wing Wall– Foundations
Monolithic Bridge Like Pipe Culvert, Box Culvert and Arch Act like one unit.
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