The nonlinear dynamic response of jacket-type offshore platform (which has been installed in Persian Gulf) under simultaneously wave and earthquake loads is conducted. The interaction between soil and piles is modeled by Konagai-Nogami model. The structure is modeled by finite element method. The analyses include models with the longitudinal component of earthquake and wave in the same direction and in different directions. The results indicate that when the longitudinal component of earthquake and wave are in the same direction, wave may reduce the response of studied platform and when they are in different directions, in some cases there is an increase in the response of platform.
Generation of waste from the various industries causes harmful impact to environment if there has no safe management for their disposal or reuse. The construction industries have ability to reuse or utilize different types of solid wastes. The waste from poultry farms in the form of eggshell also cause problems to the environment and need some utilization. The eggshell powder (ESP) is enriched with natural lime; therefore, it can be used for soil stabilization. In the present paper, eggshell powder was used along with sodium chloride (NaCl) and polypropylene fiber (PPF) to study their influence on physicochemical properties of soil. The soil samples were subjected to ten cycles of freeze-thaw before examining the pH of respective sample. Eggshell powder (3%, 6% and 9%), sodium chloride (2%, 4% and 6%) and polypropylene fiber (0.05%, 0.1% and 0.15%) were used and design of experiments was developed using Taguchi technique. Results showed that inclusion of these materials had significant effect on the pH and unconfined compressive strength of subjected soil against harsh environmental conditions, although the relation between pH and UCS was found non-linear.
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