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A platform for research: civil engineering, architecture and urbanism
Mechanics of bond under repeated loading
Research highlights ► The specimens failed by fatigue of bond-splitting of concrete cover. ► The bottom cover was pushed away during cycling, preserving the concrete keys intact. ► The slip behaviour was divided into two stages. ► The damage to the concrete cover due to repeated loading forced a redistribution of the bond stress. ► A description of the mechanics of bond under repeated loading is presented.
Abstract In the last two decades, an increase in the live loads applied to structures, such as bridges, coupled with a decrease in dead load due to the use of lighter high-strength materials have made the effect of repeated loading on these structures more pronounced. The concrete–steel bond dictates the behaviour of reinforced concrete at the serviceability and ultimate limit states. However, relatively little research has been reported in the literature studying the effect of repeated loading on bond. In this study, nine reinforced concrete anchorage-beam specimens (250×150×2000mm) were tested under different repeated loading range levels. The results showed that bond fatigue failure could occur for load ranges as low as 45% of the beam’s static capacity and that the load-life behaviour was linear on a log–log scale. As the number of cycles increased, the slip behaviour changed from a stable to an exponential increase. This was accompanied by a redistribution of the bond stress along the bonded length. Based on the experimental observations and data analysis a description of the mechanics of bond stress and slip under repeated loading is presented.
Mechanics of bond under repeated loading
Research highlights ► The specimens failed by fatigue of bond-splitting of concrete cover. ► The bottom cover was pushed away during cycling, preserving the concrete keys intact. ► The slip behaviour was divided into two stages. ► The damage to the concrete cover due to repeated loading forced a redistribution of the bond stress. ► A description of the mechanics of bond under repeated loading is presented.
Abstract In the last two decades, an increase in the live loads applied to structures, such as bridges, coupled with a decrease in dead load due to the use of lighter high-strength materials have made the effect of repeated loading on these structures more pronounced. The concrete–steel bond dictates the behaviour of reinforced concrete at the serviceability and ultimate limit states. However, relatively little research has been reported in the literature studying the effect of repeated loading on bond. In this study, nine reinforced concrete anchorage-beam specimens (250×150×2000mm) were tested under different repeated loading range levels. The results showed that bond fatigue failure could occur for load ranges as low as 45% of the beam’s static capacity and that the load-life behaviour was linear on a log–log scale. As the number of cycles increased, the slip behaviour changed from a stable to an exponential increase. This was accompanied by a redistribution of the bond stress along the bonded length. Based on the experimental observations and data analysis a description of the mechanics of bond stress and slip under repeated loading is presented.
Mechanics of bond under repeated loading
Rteil, Ahmad (author) / Soudki, Khaled (author) / Topper, Timothy (author)
Construction and Building Materials ; 25 ; 2822-2827
2010-12-24
6 pages
Article (Journal)
Electronic Resource
English
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