This report describes of the method of evaluating the effect of bracings and the effective methods of introducing diagonal bracings to green houses' frames, from results analysed by F.E.M. (Finite Element Method) considering rahmen structural elements. In analysis, two types of green houses are modelded which are gabled and semi-circular types. And statical and dynamical methods of evaluating the effect of bracings are proposed. One of the objects introducing braces is to restraine displacements of frames. But by this restraining, stresses are induced in members and make safety of materials to decrease. The stiffness of structures becomes larger if braces act effectively. From the characteristics of displacements, safety of members and fundamental frequencies, effective methods of bracings to green houses' frames are evaluated. Following conclusions were obtained; 1) For gabled and semi-circular houses, it is desired that braces are placed such as one end of a brace is connected to the supporting point of a column and the other to the eave or the top of a roof. 2) The methods proposed in this paper can be used to solve the problem of optimum design of a green house frame.
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