Prestress Loss Database for Pretensioned Concrete Members

Polya urn model-based performance assessment of PSC bridges: prestress loss consideration

“…The database contained details of 237 girders representative of the actual PSC bridge girders. From the study, it is found that the ratio of estimated (using the detailed AASHTO LRFD procedure)-to-measured total prestress loss has a mean value of 1.25 and a coefficient of variation of 0.24 (Garber et al 2016). While these statistics are useful for determining the characteristic value of the stated ratio, it has been found that for as many as 30 girders in the database created by Garber (Garber 2014), the predictions by AASHTO 2012 are nonconservative and hence in the present study, the mean value only has been used.…”

“…The information about the concrete mixture proportions is not required for the use of this method. The prestress loss provisions of AASHTO LRFD 2012 have been evaluated by Garber et al (Garber et al 2016), using an extensive database. The database contained details of 237 girders representative of the actual PSC bridge girders.…”

“…This example demonstrates the usefulness of the methodology, presented in the previous section. A bridge system with one hundred nominally similar PSC bridge girders of span = 17.22 m and having dimensions as given by Garber et al (Garber et al 2016), Table 1 Reward structure considered a The reward rate assumed in this paper is akin to the condition rating of the components of a bridge prescribed in United States National Bridge Inventory. An excellent review of the bridge condition rating is given in Omar and Nehdi (Omar and Nehdi 2018)…”

“…In this Appendix an attempt has been made to compare the estimated prestress loss, obtained using the procedure presented in Section 3.1, with the relevant experimental values. For this purpose, 16 nominally similar girders exposed to nominally similar environmental conditions are obtained from the database of girders created by Garber et al (Garber et al 2016). This exercise is taken up to examine whether the AASHTO LRFD 2012 (AASHTO 2012) method provides satisfactory results with respect to prestress loss estimation (required for applying the proposed method, Section 3).…”

Composite beam theory for pretensioned concrete structures with solutions to transfer length and immediate prestress losses

“…Bymaster et al [89] studied prestress losses of light weight self-consolidating concrete and reported that current AASHTO design provisions [52] may overestimate elastic shortening loss for specimens with low concrete strength. Caro et al [90] and Garber et al [91] summarized the major prestress losses formulas and developed a database for pretensioned concrete structures.…”