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Most of region in Indonesia is an earthquake- vulnerable area. Therefore, the buildings in Indonesia must be built to have an earthquakes resistance. Along with technological developments in the design of earthquake-resistant buildings, an alternative design approach has been developed to reduce the risk of building damage due to earthquakes, and be able to maintain the integrity of structural and non-structural components against strong earthquakes. One of the concepts of the planning approach that has been used by many people is to use seismic isolation or base isolation. In this research, we want to know the advantages of isolated structural systems compared to conventional structural systems and in order to determine the most suitable base isolation for low rise building structures for residential houses in Indonesia. The analytical method used is by modeling 4 structural models consisting of 2 models of 1-story house structures both with conventional systems and isolated systems and 2 models of 3-storey houses both with conventional systems and isolated systems using ETABS 18.0.2 software and based on SNI 1726-2019. From the results of the study, the base shear force using an isolated system can be reduced upto 34.02% for the x-direction and 33.53% for the y-direction from the conventional system on the 1-story house structure model. Whereas for the 3-storey house structure model, the base shear force using the base isolation system can be reduced upto 45.81% for the x-direction and 42.03% for the y-direction from the conventional system. [ABSTRACT FROM AUTHOR]

Indonesia is situated in the so called “Ring of Fire” where earthquake are very frequent. Despite of all the engineering effort, due to the March 28, 2005 strong earthquake (8.7 on Richter scale) a lot of modern buildings in Nias collapsed, while the traditional Northern Nias house (omohada) survived without any damage. Undoubtedly many other traditional buildings in other area in Indonesia have survived similar earthquake. Something in common of the traditional building are the columns which usually are not fixed on the ground, but rest on top of flat stones. In this paper some traditional building are subjected to non linear time history analysis to artificial earthquake equivalent to 500 years return period earthquake. This study shows that apparently the columns which rest on top of flat stone acts as friction damper or base isolation. The presence of sliding at the friction type support significantly reduces the internal forces in the structure.