LBA LIA (English Learning Center)

October 20, 2009 by  
Filed under Uncategorized

LBA LIA was an afterschool English language learning center, built sometime after 2000, located in the city of Padang.  The building was a 4-story reinforced concrete frame building with brick infill.  After the September 30, 2009 earthquake, the first and second story of the building collapsed, resulting in 4 total fatalities.  Based on local accounts, 11 were trapped in the collapsed building after the earthquake but 7 of them were able to be saved. 

The typical beams and columns sizes used in the building are very small for supporting such heavy 4-story building.  The typical interior columns were 16”x18” and the typical interior beams were 14”x18”.  Notice that the partitions are brick walls, adding a lot more mass to the building.  The reinforcement used throughout the building are smooth rebars.  The concrete columns seem to lack adequate confinement for ductile detailing (Fig 6).  “Short hooked anchors” (Fig 7) are also very common throughout the building.  Notice that the short anchorage length does not satisfy the 12db requirement per ACI.

Front view of the collapsed building
Front view of the collapsed building
Side view of the collapsed building

Side view of the collapsed building

Back view of the collapsed building

Back view of the collapsed building

Third story columns shear failure at the stairs

Third story columns shear failure at the stairs

The beams and columns sizes are very minimal for such a heavy 4-story building

The beams and columns sizes are very minimal for such a heavy 4-story building

Damaged joint exposing lack of confinement from the minimal ties

Damaged joint exposing lack of confinement from the minimal ties

The hooked anchor commonly found in damaged buildings, which do not provide adequate anchorage length

The hooked anchor commonly found in damaged buildings, which do not provide adequate anchorage length

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