Seismic performance of reinforced concrete buildings with double concave friction pendulum base isolation system: case study of design by Indonesian code

Abstract

Seismic isolation systems for buildings design are not as popular in the seismically active developing countries as they are in the developed ones. Several factors contribute to this, namely the lack of knowledge on the benefits of the seismic isolation systems, unfamiliarity with the design procedure, and the absence of relevant building codes that provide design guideline using seismic isolation system in such countries. Recently, the Indonesian seismic design code has been updated and has included the design guideline of structures using seismic isolation system. This paper describes a case study of design procedure and performance evaluation of base-isolated reinforced concrete buildings using double-concave friction pendulum (DCFP) isolation bearing following the most recent Indonesian seismic code. Seismic performances of typical 10-story fixed-base and base-isolated buildings under the risk-targeted maximum considered earthquake (MCER) in Jakarta city, the capital of Indonesia, are investigated using nonlinear finite element analysis. The results demonstrate that buildings with DCFP isolation bearings have better seismic performance than the conventional fixed-base building under the MCER. The improvements of seismic performances are observed in the form of reductions of base shear force, top-story acceleration, acceleration amplification ratio, and the interstory drift ratio. Comparisons of seismic performance of base-isolated buildings with different DCFP friction types and arrangement have demonstrated that the building with all low friction DCFP bearing performed the best among all base-isolated building models with DCFP bearings.