Analysis of conventionally reinforced concrete bridge girders for low-cycle fatique in shear Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/m326m524k

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  • Increasing load magnitudes and loss of reinforcing steel cross-sectional area from corrosion creates the potential for low-cycle fatigue (LCF) in conventionally reinforced concrete (CRC) bridge girders lightly reinforced for shear. LCF of reinforcing steel may be of particular concern. Little data are available for LCF of reinforcing steel without stress reversals. LCF tests were performed on 40 specimens of Grade 276 (40 ksi) #13 (#4) reinforcing steel, a widely used bar size for shear reinforcing in older CRC bridges. Specimens were tested in air and embedded in concrete. An S-N curve was created for the LCF region and the observed fatigue life of embedded samples was comparable to those tested in air. Six (6) full scale girders representative of 1 950s vintage reinforced concrete deck girder (RCDG) bridges were tested for LCF. It was determined that the shear reinforcement controls LCF in shear dominated sections. An analysis methodology for LCF in girders is developed, as is a methodology for obtaining post-yield stresses in shear reinforcement. An equation for obtaining equivalent shear reinforcement spacing after stirrup fracture is developed.
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