Damage Assessment of Rectangular Concrete-Filled Steel Tubes for Performance-Based Design

Damage evolution of rectangular concrete-filled steel tube (RCFT) column and beam-column members as documented in experimental tests is presented in this paper. An experimental database was first constructed that included RCFT tests that were reported in detail in the worldwide literature. Based on the experimental data, appropriate damage states for RCFT members, connections, and frames were defined at different levels of loading. For each damage state, the performance of the specimens was documented quantitatively with the use of deformation-based damage functions, energy-based damage functions, and ductility functions developed in this work. The paper then documents how to use these damage measures to assess capacity of RCFT columns and beam-columns within the context of a performance-based design methodology.

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