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박춘군(Chun-Jun Piao),박한일(Han-Il Park) 한국해양공학회 1999 韓國海洋工學會誌 Vol.13 No.1
For offshore structures, dynamic analysis becomes increasingly important as water depth increases and structural configuration becomes more slender. In the case of dynamic analysis of frame structures, much computer time and high cost are required due to many degrees of freedom. In this paper, a new technique of permutating a segment of frame structure to a beam is developed, which is called here Beam Permutation Technique. The technique is based on definition of stiffness matrix of the beam which is obtained by defining the actions(or forces) required to obtain unit translation or rotation for each degree of freedom with all other degree of freedom restrained to zero displacement or rotation. In the technique, an assumption is made that relative positions of nodes in the ends of the segment are not variable. The technique can significantly reduce the degrees of freedom of frame structures and thus the computing time in dynamic analysis. The natural frequencies and static displacements of the permutated beam are obtained and compared to those of ANSYS with a good agreement.
박춘군,박한일 韓國海洋大學校 附設 海洋科學技術硏究所 1999 硏究論文集 Vol.8 No.-
For offshore structures, dynamic analysis becomes increasingly important as water depth increases and structural configuration becomes more slender. In the case of dynamic analysis of frame structures, much computer time and high cost are required due many degrees of freedom. In this paper, a new technique of permutating a segment of frame structure to a beam is developed, which is called here Beam permutation Technique. The technique is based on definition of stiffness matrix of the beam which is obtained by defining the actions(or forces) required to obtain unit translation or rotation for each degree of freedom with all other degree of freedom restrained to zero displacement or rotation. In the technique, and assumption si made that relative positions of nodes in the ends of the segment are not variable. The technique can significantly reduce the degrees of freedom of frame structures and thus the computing time in dynamic analysis. The natural frequencies and static displacements of the permutated beam are obtained and compared to those of ANSYS with a good agreement.