INFLUENCE OF TRANSVERSE PRESSURE ON THE BOND BEHSVIOUR OF THE PRE-STRESSED WIRE IN HOLLOW CORE SLABS

Abstract

The design of platform joints in the floors of multi-storey buildings provides for the transfer of compressive forces from the upper vertical load-bearing elements to the lower ones through the supporting parts of the hollow core slabs. In this case, the supporting parts of the hollow core slabs, where the anchorage zone of the lower and upper longitudinal prestressed reinforcement is located, is exposed to transverse compression pressure. Longitudinal prestressed wire, which absorbs the supporting bending moment, works in tension with a force determined by the strength of its anchorage in concrete. As a result of an experimental study of the influence of transverse pressure during compression on the strength and deformability of anchoring prestressed wire reinforcement in concrete, the «τ_b – s_b» relationship was proposed, which makes it possible to establish the force in the reinforcement corresponding to the strength of its anchorage.