Analysing the structural layers stress of a fiber reinforced elastomeric isolator under cyclic horizontal displacement

Abstract

     Fiber reinforced elastomeric isolator (FREI) is relatively new laminated rubber seismic isolator which has been studied and developed in the world with two types: bonded fiber reinforced elastomeric isolator (B-FREI) and unbonded fiber reinforced elastomeric isolator (U-FREI). In Vietnam, studies related to the FREI focused on investigating its mechanical properties and performance of a baseisolated building using FREI under earthquake. In this paper, analysing the structural layers stress of a FREI under the simultaneous action of a constant vertical load and cyclic horizontal displacement with increasing amplitudes is investigated by finite element analysis using ANSYS software. Results show that the peak compressive stress value in rubber layers and peak tensile stress value in fiber layers of BFREI are larger than those of U-FREI at a given horizontal displacement amplitude