الفهرس 
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Abstract
Renewable energy has become an increasingly popular and excellent source of energy. Wind power is a prominent renewable energy source in both industrialized and developing countries. Onshore and offshore, wind turbine farms can be found practically everywhere in the world. Because it is abundantly available, widely distributed, and environmentally friendly, wind energy is one of the most promising renewable energy supplies. Despite the fact that most countries, including Egypt, have onshore wind turbines, Western European countries have migrated offshore to meet their high energy demands. Offshore wind turbines are now widely considered as a reliable renewable energy source. The cost of establishing the support structure accounts for 60% of the overall cost of installing the wind turbine. Because of its ease of fabrication, low cost, and controllable construction, the monopile has been employed for offshore wind turbine foundations all over the world. Monopiles are hollow steel piles with diameters ranging from 1 to 6 m and a wall thickness of 40 to 80 mm. They are typically used in shallow water, up to 30 m, and are driven or drilled into the soil. In this study, PLAXIS 3D version 2013 was used as a modeling tool. Used a numerical model to simulate monopile tests in the field using field data measurements. In this research, the behavior of a monopile foundation that is placed on Egyptian sand soil under Egyptian weather conditions is investigated numerically and theoretically. Parametric studies have been designed and worked on turbines starting from 3 MW to 10 MW. The numerical model was used to analyze the soil-pile interactive performance and evaluate the effects of monopile characteristics such as embedded length (L), diameter (D), and thickness (t) in various cases of investigation under both vertical and horizontal forces. In the last stage of this research study, an attempt was made to evaluate the improvement in the lateral capacity of a pile by using the system of ties (aka guys) to support the monopiles and reduce their diameter, thickness and free length at deep-water.