EXPERIMENTAL STUDY OF RESTORING FORCE CHARACTERISTICS OF STEEL REINFORCED RECYCLED CONCRETE FRAME INFILLED WITH RECYCLED CONCRETE HOLLOW BLOCKS

Based on tests of five models of steel reinforced recycled concrete frame infilled with recycled concrete hollow blocks under low cyclic reversed loading，their skeleton curves，hysteretic curves，displacement ductility and energy dissipation were analysed，then the test data of feature points in the skeleton curves were obtained． On the basis of the experimental study，the test data were fitted by ORIGIN 8. 0 software and the dimensionless skeleton curve model considering the influence of various parameters，through further regression analysis，the degradation law of unloading rigidity and reloading rigidity was proposed． Ultimately，the restoring force model of steel reinforced recycled concrete frame infilled with recycled concrete hollow blocks was proposed． The comparative analysis of measured skeleton curves and restoring force model showed that this model fit better and could be used for elastic-plastic seismic response analysis of steel reinforced recycled concrete frame infilled with recycled concrete hollow blocks．