Abstract: To study the basic mechanical properties of square ribbed steel bars in concrete bridges, 26 pieces of the square ribbed steel bar samples were acquired from a century-old concrete bridge in Suzhou city, and analyses on surface characteristics, element content, mechanical properties of the samples was carried out by means of macro- and micro-morphology observation, chemical composition measurement, and static tensile test. The results showed that the surface characteristics of square ribbed steel bars in the century-old concrete bridge partly meet the current standard specifications. The microstructure of the steel bars consisted mainly of ferrites and pearlites, with a certain amount of inclusions such as sulfides and silicates in which the content of the latter was significantly higher than that in modern steel bars. The carbon content was less than 0.25%, indicating that the square ribbed steel bars were made of low-carbon steel. The contents of Si and Mn elements met the current standard specifications, while the contents of S and P were higher than the upper acceptable limits in the current standard. The century-old steel bars were measured to have yield strength, ultimate tensile strength, percentage elongation after fracture, elastic modulus, and strength-to-yield ratio (all were average values) of 276.40 MPa, 413.43 MPa, 35.49%, 1.92×105 MPa, and 1.49, respectively. The elastic modulus was slightly lower than that of the steel bars used in modern bridges, while the strength-to-yield ratio and the percentage elongation after fracture both met the current standard specifications for steel bars in bridges. The output of this work provides basic mechanical parameters for concrete bridges and historical buildings at the same period, which are of a certain engineering importance for the maintenance and reinforcement of similar concrete structures.
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2025, Vol. 39 
