This file was created to help facilitate data re-use. If any further information is needed, please contact wangdd0914@cqu.edu.cn

Methodological information:
o Description of methods used for data collection and Generation
The data was collected both during curing and loading. Four-point bending tests of composite UHPFRC-NC beams with varying layers of UHPFRC and reinforcement ratio were conducted.
The load was applied displacement-controlled using a universal hydraulic testing machine. The load and displacement were collected by a load cell and the displacement transducer at the middle of the composite beams.
The reinforcement strain was collected by distributed fibre optic sensors (DFOS) during curing and loading.

o Description of methods used for data processing
The DFOS measurements were processed with the software Matlab. For every specimen, the reinforcement shrinkage strain at the loading day was added to the reinforcement strain during loading. Measurements were taken in the program and exported as a .tsv file:
Reinforcement strain data

Early reinforcement strain: Reinforcement strain was collected seven days after curing;

Reinforcement strain distribution: The strain profile along the reinforcement was analyzed with and without considering shrinkage effect;

o Software or instrument-specific information
To process and merge the .tsv output from the DFOS measurements and the testing machine, Matlab was used.
The merged and condensed data is stored as 20240409_2024-04-09_08-10-20_ch2_gages in this dataset.

o Definitions of codes and symbols
The data for every specimen are numbered according to the sequence of testing. The day of testing is given as a prefix in the extracted data from the DFOS measurements.

Data-specific information:
o Count of number of variables, and number of cases or rows
A total number of 5 specimens were tested.
The file "tension" is the data of UHPFRC in tension.

o Variable list, including full names and definitions (spell out abbreviated words) of column headings
specimen_nr (numbered according to the sequence of testing):
reinforcement ratio
UHPFRC layer replacement ratio
specimen_label (Material-reinforcement ratio-reinforcement diameter-replacement ratio)
b (width of specimen)
d (reinforcement diameter)
tau (local bond stress)
Es (elastic modulus of steel rebar)
As (cross-sectional area of the steel rebar)
EUH (elastic modulus of UHPFRC)
fcu (cubic compressive strength of UHPFRC, tested on cubic 100x100x100 mm)
fco (compression strength of concrete)
Gf (tensile fracture energy)
Yield_load_without_considering_shrinkage_strain_strain_gauges
Yield_displacement_without_considering_shrinkage_strain_DFOS
Yield_load_considering_shrinkage_strain_strain_gauges
Yield_displacement_considering_shrinkage_strain_DFOS
Load_cracking
Load_peak
Displacement_cracking
Displacement_peak
Displacement_ultimate
Steel_segment_length
t0 (day of curing)

o Units of measurement
sec, mm, mm², kJ/m², MPa and kN

o Definitions for codes or symbols used to record missing data
For missing data or data excluded from the dataset NaN was used.

o Specialized formats or other abbreviations used decimal separator.