Proposal and Application of Stress-Strain Model for Concrete Confined by Steel Tubes

Abstract eng:
Confinement of concrete by transverse reinforcement has been one of the important research fields in concrete researches. Traditionally, spirals or hoops have been generally adopted to confine concrete. For high-strength concrete (HSC), however, confinement by conventional spirals or hoops needs a large quantity of steel, which might cause problem concerning with concrete placing. Therefore, instead of the conventional spirals or hoops, a new and effective confinement method is desirable for HSC in particular. Confinement by steel tubes is an alternative method that can meet this need due to its following advantages: 1) to provide strong confinement to HSC easily without causing problem of concrete placing, 2) to confine the whole section of a concrete member so that one can expect enhancement not only of ductility but also of ultimate load-carrying capacity, and 3) to work as form for columns. To promote the use of confinement by steel tubes in particularly HSC structures, a stress-strain model for concrete confined by steel tube needs to be developed, and its applicability to the assessment of flexural behavior to be verified. Objective of this paper are to propose a stress-strain model for normal- and high-strength concrete confined by steel tubes, and to verify its applicability and validity to the assessment of flexural behavior of the concrete members confined by steel tubes. The proposed model is simple and comprehensive, and can cover a wide range of material (concrete and steel) strengths and different confinement configurations (square steel tubes and circular steel tubes).

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