Confinement of concrete in double skin tubular members under axial compression loads
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ORIGINAL PAPER
Confinement of concrete in double skin tubular members under axial compression loads Wissam D. Salman1,2 · Ahmed Abdullah Mansor2 Received: 4 January 2020 / Accepted: 2 November 2020 © Springer Nature Switzerland AG 2020
Abstract A hybrid double-skin tubular members (DSTM) consist of three composite materials in one section, include fiber-reinforced polymer (FRP) tube outward, steel tube inward and concrete is in between. These three materials give the member unique properties like protect member from harsh environment, reduce the amount of concrete by the presence of an inner steel tube that allowed the passage of services. Therefore, consider sustainable structure elements, as well as the rising strengthening of members and excellent corrosion resistance. This paper presents an experimental and analytical study of twenty-four circular columns with two types; concrete-filled FRP tube (CFFT) and double skin tubular column (DSTC), with a dimension of 100 × 310 mm which constructed and testing under an axial compressive load till failure, with four variables: numbers of layers of outer FRP tube, the compressive strength of concrete, thickness to diameter ratio and void ratio of inner steel tube. The experimental results showed that the concrete was effected confinement in hybrid DSTC led to very ductile behavior of stress–strain relationship and the number of outer FRP layers was the most effective parameters on DSTCs behavior. The nominal confinement ratio was affected by the thickness of outer FRP tube and compressive strength of concrete inside DSTCs. Keywords Double skin tubular member (DSTM) · Concrete filled fiber tube (CFFT) · Steel tube · Void ratio and confinement ratio
Introduction The confinement of concrete by FRP or steel tube, or by FRP warp jacket used enhance properties of concrete strength, preventing concrete crushing and increase ductility of members. Many studies on the effect of confinement method dealt with deference between concrete-filled fiber tube (CFFT) behavior and FRP warp jacket. Vincent and Ozbakkloglu (2013) and Salman et. al. (2018) show the confinement methods has no considerable influence on behavior of axial stress–strain of FRP confined concrete, the performance of FRP-wrapped concrete specimens were similar to CFFTs.
* Ahmed Abdullah Mansor [email protected] Wissam D. Salman [email protected] 1
Civil Engineering Departments, University of Diyala, Baqubah, Diyala, Iraq
College of Engineering, University of Diyala, Baqubah, Iraq
2
Ozbakkaloglu and Vincent (2013), was conducted an experimental program to study the effect of variables (fiber type high modulus and aramid fiber, specimen size, concrete strength) on axial compression behavior of high strength concrete-filled fiber tube (HSCFFTs). The sufficient confined of high-strength CFFTs showed very highly ductile behavior, whatever, the behavior of CFFTs was sensitive adequately to the confinement level. Slightly confined HSCFFTs may be not able to maintain the capacity of
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