Dynamic behaviour of groundsupported tanks considering fluidsoilstructure interaction (Case study: southern parts of Tehran)

Regarding the importance of the prevention of hazards and adverse environmental impacts in industrial and populated areas such as southern parts of Tehran city, the response of impulsive period groundsupported tanks were assessed. Having considered the study areas soil properties, the response of groundsupported tanks was modelled. Regarding the soil properties of southern parts of Tehran, the soil structure interaction method explained in FEMA 368 revealed that the interactional impulsive period (~T) was greater than noninteractional one (T). In addition, results showed that Poissons ratio and stiffness ratio (K/Kx) were more effective regarding the response of the interactional period of groundsupported tank systems. According to the achieved results, the liquid mass density effect on impulsive period was as low as the thickness of the groundsupported walls effect. Results showed that wall materials significantly affected the variation within the impulsive period. Generally, concrete materials were shown to be more periodic than steel materials. Overall, in southern parts of Tehran, when the soil fluid structure interaction method was used, the period increased from 1 to up to 3.6 times greater than the normal impulsive period.