Energy dissipation and resilience of precast segmented concrete-filled steel tube self-centering column: Parameter study and design methodology

摘要

Based on the pseudo-static test of precast segmented concrete-filled steel-tube (PSCFST) self-centering columns, a fiber-section analysis model was established, then validated through comparison with the test results. After that, a detailed parameter analysis is conducted to investigate the energy-dissipation and the resilience performance of the PSCFST column. Furthermore, a design process was proposed which takes into account both energy dissipation and self-centering by introducing the two coefficients, the energy dissipation coefficient, lambda(ED), and resiliency coefficient, zeta(SC). The optimized ratio of the energy-dissipated (ED) reinforcements and the posttension prestressing tendons are determined based on the two coefficients. Based on the concept of contradictory between the energy dissipation and resiliency performance, the design procedure showed that the separation of the two functional requirements of energy dissipation and self-centering is more convenient. Compared the PSCFST self-centering column with original RC column, the ultimate bearing capacity of PSCFST self-centering column is increased by about 35.73%. When the ratio of the ED bars and the prestressing tendons is 2:1, there is an ideal flag hysteresis relationship for the self-centering column with favorite energy dissipation.