Ductility unknown [DU99]

It is unknown whether the structure is designed and constructed to be ductile. The structural components may be hidden, or information about them is unavailable. It is usually not obvious whether a building was designed to perform in a ductile manner, without additional information such as design calculations and construction drawings.

It is not clear whether this reinforced concrete frame building in Manila, Philippines was designed and constructed to perform in a ductile manner (C. Scawthorn)

It is not clear whether this building under construction in Bishkek, Kyrgyzstan was designed to perform in a ductile manner (C. Scawthorn)