Experimental analysis of reinforced concrete columns strengthened with self-compacting concrete and connectors

P P Nascimento,D L David,R B Gomes,L L J Borges

doi:10.1590/s1983-41952012000300004

P P Nascimento, D L David + Show 2 more

Open Access

https://doi.org/10.1590/s1983-41952012000300004

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Abstract

There are many problems involving cases of destruction of buildings and other structures. The columns can deteriorate for several reasons such as the evolution and changing habits of the loads. The experimental phase of this work was based on a test involving nine reinforced concrete columns under combined bending and axial compression, at an initial eccentricity of 60 mm. Two columns were used as reference, one having the original dimensions of the column and the other, monolithic, had been cast along the thickness of the strengthened piece. The remaining columns received a 35 mm thick layer of self-compacting concrete on their compressed face. For the preparation of the interface between the two materials, this surface was scarified and furrowed and connectors were inserted onto the columns' shear reinforcement in various positions and amounts.As connectors, 5 mm diameter steel bars were used (the same as for stirrups), bent in the shape of a "C" with 25 mm coatings. >As a conclusion, not only the quantity, but mainly, the location of the connectors used in the link between substrate and reinforcement is crucial to increase strength and to change failure mode.

Highlights

This study consists of an experimental program included in a research area developed at the School of Civil Engineering of Universidade Federal de Goiás (Federal University of Goiás)
The experimental phase of this work was based on a test involving nine reinforced concrete columns under combined bending and axial compression, at an initial eccentricity of 60 mm
Aiming at experimentally comparing the formulation suggested by Mello (2003), Adorno (2004) assayed 12 columns of simple concrete and reinforced concrete subjected to combined bending and axial compression under an initial eccentricity of up to 30 mm

Summary

Introduction

This study consists of an experimental program included in a research area developed at the School of Civil Engineering of Universidade Federal de Goiás (Federal University of Goiás). Aiming at experimentally comparing the formulation suggested by Mello (2003), Adorno (2004) assayed 12 columns of simple concrete and reinforced concrete subjected to combined bending and axial compression under an initial eccentricity of up to 30 mm. Nascimento (2006) investigated columns strengthened with SCC on the compressed face and with carbon fiber on the tensioned face. In their works, Omar (2006) and Nascimento (2006) observed load capacity increase on columns under combined bending and axial compression and strengthened with SCC on the compressed face, uncoating of the strengthening concrete was confirmed. DAVID between connectors influence the columns’ failure loads and especially their failure modes

Experimental program

Results

B L-Box test

Conclusions