Author(s)

C. G. Karayannis, C. E. Chalioris & P. D. Mavroeidis

Abstract

In this study the behaviour of reinforced concrete beams with rectangular spiral reinforcement under monotonic loading is experimentally investigated. In this direction, three beam specimens with ratio =α d / 2.67 were constructed and tested in monotonic shear loading. The first specimen had common stirrups, the second one spiral transversal reinforcement and the third one spiral transversal reinforcement with favourably inclined legs. Based on the experimental results and the behavioural curves of the tested beams it is deduced that the specimens with continuous spiral shear reinforcement demonstrated 15% and 17%, respectively, higher shear strength than the beam with closed stirrups. Further, the beam with spiral transversal reinforcement with favourably inclined legs exhibited enhanced performance and a rather ductile response whereas the other beams showed brittle shear failure. Keywords: inclined reinforcement, shear beams, spiral reinforcement, tests. 1 Introduction It is generally accepted that the use of continuous spiral reinforcement in reinforced concrete elements with cyclic cross section can substantially improve the strength and the ductility of the concrete and henceforth the total seismic response and capacity of the structural element [1, 2, 3, 4]. The extension of the use of continuous spiral reinforcement in elements with rectangular cross

Keywords

inclined reinforcement, shear beams, spiral reinforcement, tests.