Application of incremental dynamic analysis for seismic assessment of existing building structures

History records that Aceh Province has been hit by earthquakes several times, including the largest one that recorded in 1983, then on December 26, 2004 with a magnitude of 9.3 SR. This earthquake devastated the city of Banda Aceh which was followed by a tsunami. Finally, in 2016, there was an earthquake that resulted in severe damage in the Pidie Jaya district. The potential for a large earthquake in Banda Aceh City requires that the buildings to have good resistance to seismic risk. In the context of seismic performance assessment of buildings, Incremental Dynamic Analysis (IDA) can be applied to investigate structural response. Incremental Dynamic Analysis is a method of parametric analysis of structural performance using the applied earthquake load response. In this analysis, the structural model is created with one or more seismic load records multiplied by a scale factor for various levels of earthquake intensity. The purpose of this study is to evaluate the seismic performance of the existing building by applying the IDA method and to obtain an overview of the structural risk due to variations in earthquake intensity that may occur. The method of Incremental Dynamic Analysis (IDA) is applied to predict and estimate the performance of the structure using several ground motions. The existing buildings that are the main focus of this study include the Tsunami Vertical Evacuation (TVE) of Lambung, TVE Alu Deah Teungoh, TVE TDMRC, SDN 48 Banda Aceh, SMPN 11 Banda Aceh, Baiturrahim Ulee Lheu Mosque, and the Subulussalam Punge Mosque. The resulting set of IDA curves was further analyzed to assess the behavior of the building structure that occurred. The result of the analysis is the distribution of structural response expressed in one or more IDA curves as a function of earthquake intensity. The results show that the structure of the TVE Lambung, TVE Alu Deah Teungoh, TVE TDRMC, SDN 48 Banda Aceh, SMPN 11 Banda Aceh, Baiturrahim Ulee Lheu Mosque, Subulussalam Punge Mosque which was studied each had an elastic drift ratio value respectively. ie for the x-direction 1.29%; 2.23%; 4.33%; 3.34%; 1.94%, 4.31%, 3.04%, while for the y-direction 2.41%; 7.05%; 5.83%; 2.84%; 1.73%; 2.41%;3.06%.