Experimental research and finite element analysis on seismic performance of resilient columns applying high-strength recycled aggregate concrete

To promote the green development of resilient cities and achieve resilient buildings constructed with recycled materials, it is necessary to further extend the engineering application technology of high-strength recycled aggregate concrete (HSRAC) in resilient structures. In this paper, pseudostatic tests were carried out on six HSRAC columns with ultra-high-strength steel bars (UHSS). The test variables include the UHSS percentage, stirrup ratio, axial compression ratio and UHSS bond strength. In addition, finite element models were developed to conduct the parametric analysis and optimization assessment. Based on the experimental research and finite element analysis, the seismic performance and repairability of HSRAC columns were discussed. The results revealed that HSRAC columns employing the UHSS possessed excellent self-centering capability and remarkable drift-hardening property. Well-designed HSRAC resilient columns can be repaired within 4.0% drift. In addition, the engineering design references were recommended based on reliable simulation results.