![]() ![]() Many researchers have tried to utilize this material in structural members and retrofitting. ECC shows high tensile ductility based on multiple micro-cracks by incorporating synthetic fibers below 2 vol.% the micromechanics and steady-state cracking theory are adopted for its material selection and mixture design. An engineered cementitious composite (ECC) has been developed to overcome the inherent disadvantages of normal concrete. ![]() Although concrete is one of the most widely used construction materials in the construction industry due to its low cost and durability, it has drawbacks, such as low tensile strength, which is approximately 10% of its compressive strength, and inherent brittle failure under tension load. As a new connection system for the concrete filled steel tube composite column with reinforced concrete beams, it can also be applied to other types of confined concrete columns.As the economic growth and development of construction technology has been rapidly expanding recently, there has been an increasing demand for huge structures, such as high-rise buildings, long span bridges, and huge underground structures. ![]() The experimental results showed that the effective confinement can be achieved by the stiffening ring, and an excellent axial bearing capacity can be obtained, as well as a superior ductility and energy dissipation capacity. Axial compression experiments on six specimens and reversed cyclic loading tests on three interior column specimens and three corner column specimens were conducted to evaluate this new beam-column system load-deflection performance, typical failure modes, stress and strain distributions, and the energy dissipation capacity were obtained. Using these configurations, concrete casting and tube lifting can be made more convenient since welding and hole drilling in situ can be avoided. The transfer of moment at the beam ends can be ensured by continuous rebars the weakening of the axial load bearing capacity due to the interruption of the steel tube can be compensated by the confinement of the stiffening ring. Multiple lateral hoops that constitute the stiffening ring are used to confine the core concrete in the connection zone. In this connection, the steel tube is interrupted while the reinforced concrete beams are continuous in the joint zone. A new connection system for a concrete filled steel tube composite column and reinforced concrete beams is proposed. ![]()
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March 2023
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