CRACK FORMATION IN HIGH-STRENGTH REINFORCED CONCRETE STRUCTURES AT COMPLEX RESISTANCE - TORSION WITH BENDING

Abstract

The paper presentsexperimental results and an analysis on the features of crack formation and crack opening in beams of solid and hollow cross sections made of high-strength reinforced concrete at a complex stress state - torsion with bending. It has been established that one or more spatial cracks can form at quantitatively comparable ratios of torque and bending moments in the considered structures in the zone of torsion with bending. The obtained experimental values of the crack opening width for beams of solid and hollow sections significantly differ from each other. The maximum opening of progressing cracks along which the destruction of the experimental structures occurred was observed not along the axis of the tensile reinforcement, but at a distance of about two diameters from this axis. The obtained results of experimental studies make it possible verification and comparative analysis of the calculation models proposed for calculating the crack resistance of rod reinforced concrete structures under torsion with bending.