1STEEL BRIDGES Teaching Resource in Design of Steel Structures IIT Madras, SERC Madras, Anna Univ., INSDAG

STEEL BRIDGES

INTRODUCTION

CLASSIFICATION

LOADS & LOAD COMBINATIONS

ANALYSIS

PLATE GIRDER BRIDGESTRUSS BRIDGESSUMMARY

2STEEL BRIDGES Teaching Resource in Design of Steel Structures IIT Madras, SERC Madras, Anna Univ., INSDAG

INTRODUCTIONAdvantages of Steel Bridges

Dead Load to Live Load Ratio is LowerLonger spans, Lesser pier and foundation cost

Lesser Construction DepthLesser cost of embankment

Rapid ConstructionLower cost of money, Lesser disruption of traffic

Less Disruption to Traffic in Urban EnvironmentLesser economic loss to community

Better PerformanceUnder fatigue, seismic load, impact load, blast load

Longer Life

Lower Life Cycle Cost

3STEEL BRIDGES Teaching Resource in Design of Steel Structures IIT Madras, SERC Madras, Anna Univ., INSDAG

CLASSIFICATION

Type of TrafficRailway, Highway, Rail cum Roadway

Type of Main Structural SystemBeam, Girder, Truss, Arch, Stayed, Suspended

Position of Carriage wayDeck type, Through type, Sem-through type

4STEEL BRIDGES Teaching Resource in Design of Steel Structures IIT Madras, SERC Madras, Anna Univ., INSDAG

TYPES OF BRIDGES AND SPAN RANGESType of Bridge

Cable suspended

bridge

Cable stayed bridge

Arch Bridge

Rigid Frame Bridge

Girder Bridges

0 200 400 600 800 1000 1200 1400 1600 1800

Span Ranges (meters)

5STEEL BRIDGES Teaching Resource in Design of Steel Structures IIT Madras, SERC Madras, Anna Univ., INSDAG

MAIN STRUCTURAL SYSTEMGirder Bridge

Plate Girder Orthotropic Deck

Box Girder

Truss Girder Composite Deck

Rigid Frame Bridges

Arch Bridges

Cable Stayed Bridges

Cable Suspended Bridges

6STEEL BRIDGES Teaching Resource in Design of Steel Structures IIT Madras, SERC Madras, Anna Univ., INSDAG

PLATE GIRDER BRIDGE

7STEEL BRIDGES Teaching Resource in Design of Steel Structures IIT Madras, SERC Madras, Anna Univ., INSDAG

PLATE GIRDER BRIDGE

8STEEL BRIDGES Teaching Resource in Design of Steel Structures IIT Madras, SERC Madras, Anna Univ., INSDAG

BOX GIRDER BRIDGE

9STEEL BRIDGES Teaching Resource in Design of Steel Structures IIT Madras, SERC Madras, Anna Univ., INSDAG

BOX GIRDER BRIDGE

10STEEL BRIDGES Teaching Resource in Design of Steel Structures IIT Madras, SERC Madras, Anna Univ., INSDAG

BOX GIRDER BRIDGE

11STEEL BRIDGES Teaching Resource in Design of Steel Structures IIT Madras, SERC Madras, Anna Univ., INSDAG

BOX GIRDER BRIDGE

12STEEL BRIDGES Teaching Resource in Design of Steel Structures IIT Madras, SERC Madras, Anna Univ., INSDAG

BOX GIRDER BRIDGE (Composite Deck)

13STEEL BRIDGES Teaching Resource in Design of Steel Structures IIT Madras, SERC Madras, Anna Univ., INSDAG

BOX GIRDER BRIDGE (Orthotropic Deck)

14STEEL BRIDGES Teaching Resource in Design of Steel Structures IIT Madras, SERC Madras, Anna Univ., INSDAG

TRUSS BRIDGE (suspended central span)

15STEEL BRIDGES Teaching Resource in Design of Steel Structures IIT Madras, SERC Madras, Anna Univ., INSDAG

TRUSS BRIDGE (continuous span)

16STEEL BRIDGES Teaching Resource in Design of Steel Structures IIT Madras, SERC Madras, Anna Univ., INSDAG

TRUSS BRIDGE (sloping chord)

17STEEL BRIDGES Teaching Resource in Design of Steel Structures IIT Madras, SERC Madras, Anna Univ., INSDAG

TRUSS BRIDGE (Bailey Bridge)

18STEEL BRIDGES Teaching Resource in Design of Steel Structures IIT Madras, SERC Madras, Anna Univ., INSDAG

TRUSS BRIDGE

19STEEL BRIDGES Teaching Resource in Design of Steel Structures IIT Madras, SERC Madras, Anna Univ., INSDAG

TRUSS BRIDGE (connection gusset)

20STEEL BRIDGES Teaching Resource in Design of Steel Structures IIT Madras, SERC Madras, Anna Univ., INSDAG

ARCH BRIDGE

21STEEL BRIDGES Teaching Resource in Design of Steel Structures IIT Madras, SERC Madras, Anna Univ., INSDAG

CABLE SUSPENDED BRIDGE

22STEEL BRIDGES Teaching Resource in Design of Steel Structures IIT Madras, SERC Madras, Anna Univ., INSDAG

CABLE SUSPENDED BRIDGE

23STEEL BRIDGES Teaching Resource in Design of Steel Structures IIT Madras, SERC Madras, Anna Univ., INSDAG

CABLE SUSPENDED BRIDGE

24STEEL BRIDGES Teaching Resource in Design of Steel Structures IIT Madras, SERC Madras, Anna Univ., INSDAG

CABLE STAYED BRIDGE

25STEEL BRIDGES Teaching Resource in Design of Steel Structures IIT Madras, SERC Madras, Anna Univ., INSDAG

SUMMARY

• Different types of Bridge systems are economical over different span lengths

• Details of common bridge systems were discussed

• An example of truss type bridge was presented

• Construction details of a suspension bridge was presented.