NUMERICAL SIMULATIONS OF ELASTOMERIC BEARINGS BRACED WITH STEEL CABLES UNDER CYCLIC DISPLACEMENT

摘要

One of the most important methods to improve the seismic performance of structures is the using of multi-layer elastomeric bearings (EB). The main purpose of applying this elastomeric device in the base level of structures is Separating of ground vibrations from body of structures. Recent researches have indicated although EB is capable to decrease damages of buildings, especially in irregular buildings despite of torsion cause of increasing roof displacement total collapse of buildings is likely so multi-layer elastomeric bearings braced with steel cable (EBBSC)to control displacement has been introduced. In this study, three different models of EBs have been studied. The first model is Simple multi-layer elasto-meric bearings (SEB), the second model is multi-layer elastomeric bearing with vertical steel cable (EBBVSC), and the third model is multi-layer elastomeric bearing with diagonal steel cable (EBBDSC). By applying the cyclic lateral displacement to top level of specimens, their hysteresis load- displacement behavior was achieved under finite element analysis. The results have indicated increasing strength and stiffness for multi-layer elastomeric bearing braced with steel cable. In other hand, the strength and stiffness value in the EBDSC model in compare with the EBVSC model has been increased 28% and 32%, respectively.