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Indonesia has often experienced seismic natural disasters such as earthquakes and tsunamis especially Padang City, the capital city of West Sumatera, Indonesia. In order to face the future earthquake and tsunami disaster, the local government has built a number of vertical evacuation shelters. One of the shelters is Ikhwatun shelter building located in Koto Tangah Subdistrict of the Padang City. The shelter was built near to the coastal and expected has liquefaction potential. This study is conducted in order to evaluate the shelter to restrain the earthquake and tsunami loads. The building is made of the reinforced concrete structure with the floor area of 2680 m2 and the high of 22.78 m. Based on the result of the soil evaluation, it was found that the soil deposit in the shelter has high liquefaction potential. Therefore, the upper and lower structures are analyzed using special response spectrum of the earthquake loads for soil liquefaction, which is 1.5 higher than those on the non-soil liquefaction. The analysis result shows that the beams, columns, and foundations are all not able to resist the applied tsunami loads. It is suggested that the building to be strengthened before being used as a vertical evacuation shelter.

Structural evaluation of Ikhwatun shelter building constructed on liquefaction potential area in Padang city, Indonesia