Abstract
To establish the restoring force model of a kind of prefabricated beam-column joints with ring-grooved bolts, the dimensionless skeleton curves and the stiffness degradation law of the joint are obtained by the regression analysis. Therein, the skeleton curves are a trilinear model divided into elastic, reinforcing and degradation stages. The calculated skeleton curves and restoring force model are in good agreement with the experimental skeleton and hysteretic curves. The result shows the restoring model can express the stiffness degradation characteristics of the joint well, as well as provide a theoretical basis for the nonlinear dynamic analysis of structures.
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