A Residential Highrise near Jakarta, Indonesia

The Amartapura I tower, part of an urban development project outside of Jakarta, is the tallest residential building in Indonesia. This 52-story building is a reinforced concrete structure with a gross area of about 50 000 m². The Amartapura I uses a conventional RC flat plate floor system. The use of the outrigger system on this building is efficient, since it reduces the overturning moment taken by the core wall. About one-third of the total overturning moment is carried by direct stress, and the balance is taken by the core. The building was designed to accommodate seismic forces generated from the Indonesian code-defined response spectrum, which is based on 10% probability of occurrence of a 200-year earthquake. A three-dimensional model was used to analyze the response of the structure and to determine the elastic time periods.