THE EXPERIMENTAL RESEARCH ON THE RESTORING FORCE MODEL OF LINTEL-COLUMN JOINTS OF CONCRETE ARCHAIZING BUILDINGS WITH VISCOUS DAMPERS

To study the restoring force model of the concrete archaizing buildings with lintel-column joints and viscous dampers, four specimens were fabricated and tested under dynamic loading. The loading process was observed and failure modes were recorded. Four-line models of skeleton curves and restoring force models considering the dynamic effects of loading are presented based on the research of typical characteristics of the specimens under loading, and are compared with the experimental results. The results show that the loading process of the specimens can be summarized by four stages of initial cracking, yielding, ultimate and failure. As the load continues, the loading and unloading stiffness degenerate obviously after the stage of yielding. The residual deformation appears in the hysteretic curves after unloading. The presented four-line models of skeleton curves agree well with the experimental results. By using the proposed four-fold restoring force model, the hysteretic curve is calculated and compared with the experimental hysteretic curves in terms of the change trend. It can be found that the two have high similarity. The hysteretic behavior of the concrete archaizing buildings with lintel-column joints and viscous dampers is described better by the four-line restoring force model.