立体骨組構造の振動特性 : 立体骨組構造の地震応答-その 1-

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Natural frequencies of space structures are obtained by the displacement method, and this paper is the first report of any series on the dynamic response analysis of space structures due to earthquakes. To simplify the analysis, the following assumptions are made. (1) The distributed masses of the member are concentrated at the joints. (2) The members are assumed as straight, constant cross section on each divided part. (3) The shearing deformation of the members are neglected. (4) The members are able to be resisted to bending moment, twisting moment, axial force and shearing force. With these assumptions, the equations of natural frequencies and the mode shape of space structurer are obtained by the displacement mehod considering effects of axical deformation. These results are as follows : (a) It is shown that space structures in vibration are greatly influenced to effects of axical force at spmmetrical first natural period. (b) It is shown that maximum natural period in space structures is symmetyical first natural period in case of lower rise and untisymmetrical first natural period in case of higher rise. (c) It is shown that in space structures as the rises becomes higher, the value of symmetrical first period decreases, on the contrary the value of untisymmetrical one increases.
1968-07-30