DEFECT STUDY ON SINGLE STOREY REINFORCED CONCRETE BUILDING IN WEST SUMATRA: BEFORE AND AFTER 2009 WEST SUMATRA EARTHQUAKE

Abstract

Indonesia has a high number of damaged buildings due to earthquake excitation. An event in2009 (Mw 7.6) affected the buildings and infrastructure of Padang, where more than one hundred thousandwere damaged to severe, medium, or slight levels. Previous studies have found that structural defects in thetypical reinforced concrete buildings are the major cause of the catastrophic results of damage. However, theresearch that presenting the predominant defects suffered by RC building is limited. Hence, this research aimedat assessing the defects on the single-storey RC building in West Sumatra to arrange the defects list and findingthe predominant defects on the target building type. Furthermore, by analyzing the data statistically, this studycompared the defect found on the buildings that were built before and after the 2009 West Sumatra Earthquake.Hence, the information about the progress on building quality after the earthquake event can be provided. Thisresearch uses field survey and data analysis of 100 single storey RC buildings with masonry wall aged from77 years till 0 years. The samples were selected randomly in the area of Padang-Pariaman district in WestSumatra, Indonesia. The results show that common defects found are 18% of the building do not have structuralcolumns, 38% without structural beams, and 60% of the building’s structural elements concrete cover do notfollow the minimum concrete cover required by Indonesia National Standard. This study also found that 20%of columns are indicated to be corroded.