NUMERICAL EVALUATION OF LOCAL RUBBER BEARINGS WITH VARIOUS CORE MATERIALS

Indonesia is a country that has a fairly high seismicity intensity. Therefore, Indonesia needs seismic protection. One of the earthquake protections is to use an isolator system. One type of isolator system that is widely available is LCRB (Lead Core Rubber Bearing). The long-term use of lead-lead in isolator cores can cause soil pollution, and the price of lead material is very expensive. Most rubber layers are obtained from the isolator's country of origin so researchers developed the use of local rubber originating from Indonesia. In this study, innovating isolator bearings using Indonesian local rubber with a core system on isolators that are filled using environmentally friendly materials and do not pollute the soil such as sand, resin, rubber, and HDPE named SCLRB (Sand Core Local Rubber Bearing), ECLRB (Epoxy Core Local Rubber Bearing), RCLRB (Rubber Core Local Rubber Bearing), and PCLRB (HDPE Core Local Rubber Bearing), The method carried out for the evaluation of core bearing performance using environmentally friendly materials is to use finite element simulation ABAQUS is used to evaluate bearing performance as well as mechanical behavior. The results of the simulation of elements to mechanical behavior found that the efficiency of the base isolator using local rubber and various core fillers is environmentally friendly, which provides considerable damping and stiffness improvements and effectively limits lateral displacement. The results of the element simulation analysis showed that the innovation of environmentally friendly materials sand, epoxy, rubber, and HDPE for isolator cores can replace lead in isolator cores that can pollute the soil.