Database of Tendon Stress Increments at Ultimate in Unbonded Post-Tensioned Concrete Members

This database compiles 263 flexural specimens with unbonded post-tensioning tendons from 27 published sources, covering simply supported (170) and continuous (93) members with internal (195) and external (68) tendons under single-point (98), two-point (90), and uniformly distributed (75) loading. For each specimen, it provides the tendon stress increment at ultimate (Δf_ps = f_ps − f_se) reported in the source, the effective prestress and tendon stress at ultimate, the basic member geometry, reinforcement, and material properties, and the non-dimensional input descriptors used to train the probabilistic Deep Gaussian process (DeepGP) surrogate model in the main paper. The values in the columns highlighted in blue (inputs) and orange (target) on the "Database" sheet are identical to the training dataset of the main paper and may be used to reproduce or benchmark data-driven prediction models. Please note that, to complete the dataset for model training, some parameters that were not explicitly reported in the original publications may have been estimated from figures, drawings, or common design practice; users are therefore kindly encouraged to consult the original sources listed below before using individual specimen data for detailed analysis.