Cylindrical steel shell sections have been applied in various engineering fields particularly in recent installations of wind turbine towers. Hence, many researchers are interested in studying cylindrical steel shell structures. However, studies on the effect of the presence or absence of openings are insufficient. Thus, the design criteria for the opening as well as the behavior of wind turbine tower are not clearly presented. Therefore, this study examines the ultimate strength and the behavior of wind tower in consideration of openings, presence of stiffeners, changes in opening width, and thickness variation of stiffeners. ABAQUS, a universal finite element analysis program, was used in to conduct this research. Finally, the results of this study can be a reference for the design and production of wind towers with openings.

ABSTRACT
 1. 서 론
 2. 유한요소해석 모델링
 3. 유한요소해석 결과
 4. 결 론
 References

• 조성준(상명대학교 공과대학 건설시스템공학과) | Cho Sung Jun
• 김성찬(상명대학교 공과대학 기술융복합학과) | Kim Sung Chan
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• 박종섭(상명대학교 공과대학 건설시스템공학과) | Park Jong Sup