analysis and evaluation of the stochastic damage for recycled aggregate concrete frames under seismic action

In this paper, the seismic response of recycled aggregate concrete (rac) frames was investigated through the bidirectional shaking table test for a three-storey rac frame model with 1:4 reduced scale. according to test results, the variation regularity of the structural frequency, damping, and the inter-storey displacement angle was analyzed, which illustrated a good seismic behavior of this rac framework. furthermore, a damage model of the corresponding rac integral structure was proposed with a comprehensive consideration of the different frequencies in x and y directions, damping ratio, stiffness, vibration mode of the structure, variety of structure forms, and test methods for natural frequency. based on the damage model for the rac structure, the damage grade was analyzed. meanwhile, combined with the classification of earthquake damage to buildings and special structures, code for seismic design of buildings (gb50011-2010), and other literature, a standard with five damage grades of the rac structure was established. at last, to apply for practical engineering, a quick computational formula for rac structure damage index was fitted. the results obtained from the previous studies indicate that the damage model is basically consistent with the experimental results and is capable of applying into seismic damage quantitative evaluations and analyses for actual rac structures.