Abstract
This paper reports a study based upon experimental investigation which aims to assess the behaviour of reinforced concrete columns strengthened with a new configuration of steel wire mesh as part of ferrocement layer under the action of axial compression loads. Square and circular small scale columns with three different slenderness ratios of 5, 6.7 and 10 were adopted. A comprehensive experimental progarmme was then running to measure the load capacity and both lateral and vertical displacements. The failure mode was also monitored for each tested case. The results obtained was compared with the reference column samples (without wire mesh) and with some expressions suggested by ACI Code. The experimental results showed that the most influential parameter on the property of load carrying capacity is the slenderness of column. As the slenderness increases, the load capacity clearly decreases. The use of wire mesh enhanced the capability of column to resist the axial loads due to confinement role provided by such material. The maximum percentage increase in load carrying capacity for the modified columns compared with those for the reference samples was 53% for the circular column at slenderness ratio of 10. The critical path of the failure mode was similar for all of the tested columns and normally began from the top or bottom ends, then, in some cases, passed through the middle zone of the column. A suitable expression was suggested to be used for calculating the modulus of elasticity of the tested column based upon the value of load carrying capacity under compression loads.
Highlights
Column members are mainly designed to resist the imposed axial loads of the structure and the global behaviour of such members depends upon the strength of the material used, nature of end supports and the length/ radius ratio
This paper reports a study based upon experimental investigation which aims to assess the behaviour of reinforced concrete columns strengthened with a new configuration of steel wire mesh as part of ferrocement layer under the action of axial compression loads
Some of the modern concepts have an orientation to modify the interior composition of columns, for instance using fiber-reinforced polymers (FRP), especially in strengthening the damaged once due to corrosion of steel reinforcement or other situations [3] [4]
Summary
Column members are mainly designed to resist the imposed axial loads of the structure and the global behaviour of such members depends upon the strength of the material used, nature of end supports and the length/ radius ratio. The other way in improving the load carrying capacity of column adopting nowadays is by confining technique throughout a steel wire mesh This technique is so called ferrocement which is usually applied with a cement mortar to act as an outer layer for the reinforced concrete column [5] [6] [7]. As its components are available in worldwide combined with the low level of skill required to the fabrication, ferrocement is considered to be an appropriate confinement material for the structural elements In such a manner, the core of column can be made with a concrete of relatively low compressive strength. The behaviour of reinforced concrete columns under axial loads with different slenderness ratios and geometries strengthened with a thick steel wire mesh was investigated throughout experimental programme. The formatter will need to create these components, incorporating the applicable criteria that follow
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