JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Course Objectives

The objective of the course is to introduce the concepts in bridge design. the

analysis of bridge decks and sub structure are also dealt with.

Course Outcomes

At the end of the course, students will be able to understand

• 1. The method of design of concrete bridges
• 2. Design of solid slab and continuous bridges
• 3. Basic principles and design of prestressed bridges
• 4. Analysis of bridge decks
• 5. Design loads of abutments and piers.

UNIT - I

Concrete Bridges: Introduction-Types of Bridges-Economic span length-Types of loading-Dead load- live load-Impact Effect-Centrifugal force-wind loads-Lateral Loads-Longitudinal forces-Seismic loads- Frictional resistance of expansion bearings-Secondary Stresses-Temperature Effect-Erection Forces and effects-Width of roadway and footway-General Design Requirements.

UNIT - II

Solid slab, Girder Bridges & Continuous Bridges: Introduction-Method of Design. Girder Bridges - Introduction-Method of Design-Courbon's Theory. Continuous Bridges - Introduction- Span lengths- Analysis of Continuous Bridges-Decking of Girders with constant Moment of Inertia-Continuous bridges with variable Moment of Inertia-Method of Analysis -Girders with Parabolic Soffit-Method of plotting Influence lines-Girders with Straight Haunches-Design steps for Continuous Bridges.

UNIT - III

Pre-Stressed Concrete Bridges: Basic principals- Method of Pre-stressing-Pretensioning and Post- tensioning- Comparison- Freyssinet Method-Magnel-Blanet System-Lee-Mc call system-Basic Assumptions-Losses in Prestress-Equation based on Initial and final stress conditions-Cable Zone- Design of selections-Condition of first crack- Ultimate load design-Shear-Vertical Prestressing- Diagonal Tension in I-section-End Block-Magnel's method-Empirical Method-General Design requirements-Mild steel reinforcement in prestressed concrete member-Concrete cover and spacing of pre-stressing steel-Slender beams-Composite Section-Propped-Design of Propped Composite Section-Unpropped composite section-Two-stage Prestressing-Shrinking stresses-General Design requirements for Road Bridges.

UNIT - IV

Analysis of Bridge Decks: Harmonic analysis and folded plate theory-Grillage analogy- Finite strip method and FEM.

UNIT - V

Sub-structure of bridges: Substructure- Beds block-Piers- Pier Dimensions- Design loads for piers- Abutments- Design loads for Abutments.

REFERENCES

• 1. Design of Concrete Bridges by M.G. Aswani, V.N. Vazirani and M.M. Ratwani.
• 2. Bridge Deck Behaviour by E.C. Hambly.
• 3. Concrete Bridge Design and Practice by V.K.Raina. R19 M.TECH HIGHWAY ENGG. M.TECH.- II YEAR- I SEMESTER HIGHWAY ENGINEERING