High-cycle fatigue response of diagonally-cracked conventionally reinforced concrete bridge girders Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/ks65hh14h

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  • The behavior of stirrups engaged by diagonal cracks and under service loads is largely unknown. Full-size laboratory specimens were loaded to induce diagonal cracks and subjected to high-cycle fatigue loading to represent a service life of 50 years. Tests indicated little change in the average stirrup stress range and mean while diagonal crack width and motion increased. Observed changes in stirrup strain range and crack motion were larger when stirrup spacing was wide or anchorage of longitudinal reinforcement was poor. Disregarding aggregate interlock and dowel forces, service level shear was attributed to the compression zone and transverse steel. These were reasonably calculated by Response 2OOO™, a sectional analysis program, by setting the concrete tensile strength very low.
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