In this study, the behavior of free-standing intake tower under the effect of seismic pulses with different intensities and frequencies has been investigated. The main purpose of this study is to investigate the effects of frequency and loading intensity on the behavior of the intake tower, peripheral reservoir and water inside the tower and consequently their effects on the behavior of the intake tower. To better evaluate the behavior of the intake tower, models based on different states of presence and absence of the peripheral reservoir and internal water have been modeled and studied. The perform analysis include different conditions of pulse loading, including variable acceleration and frequency. Abacus software has been used to model and study the behavior of intake tower models. Modeling of the intake tower and its interaction with the surrounding reservoir and internal water has been done by Eulerian-Lagrangian behavior. The analysis results show that for each model, the effects of increasing loading acceleration and loading frequency on structural responses are increasing and decreasing, respectively.

The addition of the peripheral tank and internal water in all accelerations and loading frequencies have increasing effects on the response of the structure. Also, the effects of the intenal water and its height level on the response of the intake tower have a strong dependence on the loading frequency.

Even in some loading frequencies the tower with half-full internal water compared to when the water inside the tower is full, it creates more critical conditions of the responses.