ANCHORAGE BEHAVIOR OF 15.2 MM (0.6 IN) PRESTRESSING STRAND IN HIGH STRENGTH CONCRETE

摘要

Use of 15.2 mm (0.6 in) diameter strand with a 50 mm (2 in) spacing allows efficient utilization of high strength concrete (HSC) in pretensioned bridge girders. Because current code provisions concerning anchorage behavior are the result of research performed on materials used prior to the advent of HSC and 15.2 mm strand, evaluation of the effects of larger strand size and higher strength concrete is important. Results from a research study investigating the anchorage behavior of plant-cast AASHTO I-beams are presented. The influence of strand surface condition, method of prestress release, time, and concrete strengths ranging from 38 to 98 MPa (5500 to 14,000 psi) is discussed. The validity of applying current code provisions to members constructed with 15.2 mm strand and HSC is assessed.