ENGG(SERC) 3-921 : Fatigue of Concrete Structures (L-T-P-C) :3-1-0-3

Course Coordinator : Dr. K. Ramanjaneyulu

Historical back ground, structures subjected to fatigue, parameters of fatigue loading, fatigue limit/endurance limit, category of fatigue load spectrum, Fatigue-Life Methods, analytical approach to approximate S-N diagram, Basquin’s Law, Accumulated Fatigue Damage, Palmgren-Miner Hypothesis, load sequence effects (High-low, low-high), mean stress effects on S-N behaviour, Manson-Coffin relation for fatigue life based on total strain, fatigue crack growth behaviour, Paris Law, expressions for fatigue life based on critical crack length, cycle counting methods.

 S-N curves for compression fatigue of concrete, effect of loading frequency, S-N-T-R diagrams/relations, Influence of range, rate and eccentricity of loading, Load history, material properties, and environmental conditions on the fatigue strength of concrete; Scatter in Fatigue, statistical considerations; Tensile Behaviour of Concrete and Fracture Mechanics, tension softening models, different types of crack closing pressure, remaining life predictions; influence of minimum stress, bar size and type, geometry of deformations on reinforcing bars, bends, welding on the fatigue performance of reinforcing bars; Influence of type of prestressing steel (wire, strand, or bar), Steel treatment, Anchorage type, and Degree of bond on fatigue strength of prestressing steel; Fatigue failure of reinforced and prestressed concrete beams, remaining life predictions