Evaluation of seismic behavior of old reinforced concrete structures based on ductility limit

he seismic design is basically used as a tool for the make sure the structural stabiality against liquefaction. However, the design philosophy behind the earthquake is “dissipation of energy without large deformation” in the structure. As long as Sri Lanka is considered moderate vulnerability country based on the records and investigate done within last five decades. But according to the current research status, a new plate boundary is found to be creating in south west of Sri Lanka due to splitting up of Indo Australia plate as intra-plate. Hence there is a potential of increasing seismic activities in Sri Lanka and need to consider the design requirement specially in the high rise buildings. Therefore, it’s essential to be assessed the current capacity of the building to resist seismic movements around and how frequency it occurs. Most of the building have been designed in Sri Lanka without considering the ductility demand required for the cyclic loading condition. Further, the energy dissipation capacity of structure is most critical and important for asses the building risk factor. By the way Eurocode 8(EC8) and) has been emphasized the performance based design on the ductility using many more aggregate parameters such as confinement, R/F arrangement and geometry of the section etc. The seismic behaviour of the building can be assessed in several methods as push over analysis, time history analysis, ductility assessment etc. In this paper a ductility assessment has been carried out for a three storey reinforced concrete building in Sri Lanka to evaluate the capacity of the building in terms of global and local ductility demand according to Eurocode 8.