Identify the limit states of hashazini dam by applying incremental dynamic analysis

Abstract

The aim of this paper is to develop the Incremental dynamic analysis (IDA) for existing gravity dam (Hashazini dam) which located in the north of Iraq. The incremental dynamic analysis (IDA) is presented in this paper in order to determine the limit states and capacity of a gravity dam. In order to achieve this target, a series of ground motions are applied to a dam immediately one after other with increasing the intensity levels, that leads to change the behaviour of the dam from elastic situation to inelastic one and lastly causes collapse. In this paper seven ground motions considered as input data for nonlinear analysis, these records are depend on real earthquake worldwide. For the analysis purpose, the Hashazini dam has been chosen as a case study with developing of IDA curves and identifying performance level in case of single ground motion and for repeated ground motions. Incremental dynamic analyses (IDA) were performed for those simulated dams using seven artificial ground motions with scaling peak ground acceleration (PGA) increased by a 0.3g until it achieved 2.2g to determine the drift capacity of the dam in Service state limit SLS and ultimate state limit ULS. However, this paper was used ANSYS simulation to investigate the effect of earthquake shaking on the Hashazini dam and the weakness of the dam body.