Reinforcing clamps: stress-strain state of bent reinforcement

Abstract

The aim of the work is to study the stress-strain state of reinforcing bars during bending and to obtain the appropriate formulas and dependencies to clarify the possible boundaries of the use of mandrels for reinforcement of various classes and diameters. The object of the study are bending bars used as transverse reinforcement in the design of linear reinforced concrete elements. The study determines the possible limits of use for various classes of bars, where the relative deformations of steel do not go beyond the yield strength. A formula is obtained for calculating the possible limiting diameters of mandrels D for various diameters of bent bars d. The limiting diameter of the mandrel depends only on the relative standard elongation of the extreme fiber of the bent bar Graphs of relative elongations of the extreme fiber of the bars are plotted for different diameters of a bent bar made of reinforcement of classes A240, A400, A500S. The calculated values of relative elongations in percent are calculated for plain bars and ribbed bars with diameters from 6 to 28 mm.

Keywords

• reinforced concrete
• bend
• curvature
• mandrel
• relative deformation
• transverse reinforcement
• collar