Abstract
Concrete Encased Steel (CES) system consisting of fiber reinforced concrete (FRC) and steel is a new composite structural system proposed by the authors, and is being conducted continuous and comprehensive studies to make it practical. In existing studies, the influence of the axial force ratio, the H-shaped steel ratio, the shear span ratio, the concrete fiber contents ratio (the ratio of fiber volume to concrete volume) and the flange width of H-shaped steel on the deformation capacity were investigated. Also the deformation capacity was examined by using the above five parameters. Then equations to evaluate the deformation capacity were proposed. It is clarified that the proposed equations show good agreement with the test results. In this paper, hysteresis models for CES columns to use the earthquake response analysis are proposed with considering the deformation capacity. The accuracy of the model is verified by comparing with the test results.
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