Rusnardi Rahmat Putra
The purpose of this paper is to introduce a complete assessment to damaged buildings due to earthquake event in earthquake-prone areas. Padang city is located on the western part of the island of Sumatra, Indonesia, an earthquake-prone area. One of the largest earthquake events (Mw 7.6) occurred on 30 September 2009, striking the west coast of Sumatra. A total of 106,658 houses and 4,000 other buildings suffered damage classified from slight to severe, and a reported 1,117 people were killed. Some large-scale reinforced concrete buildings in Padang, as the capital of West Sumatra province, were also damaged. In order to determine the anti-seismic deficiencies of these buildings, the authors assessed three buildings (BPKP, UNP and PU building) on soft soil (the predominant period is greater 2s and Vs30<150m/s), and re-analyzed the BPKP building based on the simulated ground motion of this earthquake event. In applying the current Indonesian seismic design code for the BPKP building and visual checks by applying Japan Building Disaster Prevention Association (1991) to evaluate the degree of damage at two further buildings, the results of this re-analysis revealed that one of these buildings did not satisfy the demand capacity. By computing, the effects of local soil conditions on ground motions from station ADS (Vs30 > 400m/s) to the BPKP building (Vs30<150m/s), the peak ground motion acceleration at BPKP was found to have amplified 1.47 times. This result enables us to conclude that the soil characteristics (rock to soft) influence ground motion amplification and affect the degree to which buildings suffer damage. © Int. J. of GEOMATE.
Civil Department, Engineering Faculty, Universitas Negeri Padang, Indonesia
