Abstract
The aim of this study is to compare the seismic performances of strengthening techniques applied to reinforced concrete (RC) non-ductile frames tested under the effects of seismic loads. In the experimental part of the study, one-third scale, one-bay, two-storey non-ductile hollow brick infilled RC frames were strengthened with five different techniques and tested under reversed cyclic lateral loads. One being reference, five of the frames were infilled with hollow bricks and plastered on both sides, one was strengthened with plain mortar, one was strengthened with steel fiber reinforced mortar, two were strengthened with precast RC plates. The last frame was strengthened with RC infill wall. Strengthening techniques increased strength and stiffnesses of the frames in the ranges from 57% to 189% and from 186% to 486% respectively. In the numerical analysis part, an existing RC non-ductile building located in Istanbul, strengthened with the techniques, were analyzed using a computer program. Numerical results were evaluated in terms of interstorey drift ratio together with the overall seismic performance of the building.
Highlights
Since there is great building stock waiting for strengthening before a major earthquake struck, researchers have been continuously working on strengthening techniques convenient for reinforced concrete (RC) structures being in use
Behaviour of non-ductile one-third scale RC frames having inadequate lateral stiffnesses strengthened by five different techniques were tested experimentally under reversed cyclic lateral loads
In the numerical analysis part, an existing RC non-ductile building having inadequate stiffness located in Istanbul and strengthened with the aforementioned techniques were modelled and analyzed using a computer program
Summary
Countries located on seismically active zones like Turkey had suffered extensive social and economic damages with destructive earthquakes. It was realized that major cause of damage in structures in Turkey and its neighbour countries have been stemming from inadequate lateral stiffness. The most effective way of satisfying the drift requirements of such buildings is providing adequate number of cast-in-place RC infill walls such that lateral stiffness of the building is increased. This technique involves messy construction works and evacuation of the building is required. Since there is great building stock waiting for strengthening before a major earthquake struck, researchers have been continuously working on strengthening techniques convenient for RC structures being in use. Related studies have focused currently on techniques in which hollow brick infill walls are strengthened using various materials, instead they are replaced with RC walls
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