Database of Tension Lap Splices and Embedded Bars

This database compiles worldwide data of reinforced concrete beam specimens tested to evaluate the bond strength of straight reinforcing bars in tension. The test data were collected from 72 references published between 1955 and 2024. The specimen selection criteria included: (1) normal-weight concrete with compressive strength obtained from tests of cylinders; (2) bottom-cast, uncoated, deformed steel reinforcing bars; (3) contact lap splices or bars embedded (developed) from a critical section; (4) transverse reinforcement (if present) in the form of stirrups or ties; and (5) statically applied load. The specimens were classified into six types depending on the loading, geometry, and location of the critical section. In addition to the bar stress reported by the study authors, the stress at the critical section was calculated using moment-curvature analysis. For each specimen, the database reports up to 40 parameters to describe the following data categories: reference citation, specimen identification, beam dimension, longitudinal reinforcement, concrete cover, transverse reinforcement, material property, loading parameter, beam moment, bar stress, and additional information (test type and special notes). The maximum bar stress at failure reported in the database was 155,000 psi (1,070 MPa), and concrete compressive strengths ranged from 1,820 to 16,100 psi (12.5 to 111 MPa). The maximum lap length was 120 bar diameters, and the bar diameters ranged from 0.375 to 2.25 in. (9.5 to 57 mm). The number of specimens in this database far exceeds those contained in other databases populated with comparable criteria. This database is intended to facilitate the development of more reliable and accurate equations for bond strength. The database spreadsheet includes readme instructions as a separate worksheet.