Stallings et al.1 investigated the accuracy of methods for calculating the camber at the time of erection of standard AASHTO girders fabricated with high-performance concrete. According to their findings, current analytical techniques, such as the time-step method, can correctly predict the camber provided that the material properties are accurately known. Al-Omaishi et al.2 proposed an extension to the provisions of current standards, which
were based on data obtained from concrete with strengths ranging from 4 to 6 ksi (28 to 41 MPa), for estimating prestress losses in concretes with strengths up to 15 ksi (100 MPa). Tadros et al.3 emphasized the random nature of camber that depends on several stochastic quantities, such as concrete modulus of elasticity, differential temperature at prestress release, effective prestressing force, debonding length, and transfer length. Storm et al.4 focused on the effects of production practice, which involves the curing method and other aspects, on the
camber of prestressed bridge girders, developing a refined prediction method based on the 2010 American Asso- ciation of State Highway and Transportation Officials’ AASHTO LRFD Bridge Design Specifications5 that com- pared well with the measured camber of 382 prestressed concrete bridge girders.