earticle

영어

The evaluation of the joint rigidity is very important to design the space frames with ball joints. The structural characteristic of the joint is one of the critical factors to evaluate the structural behavior and strength. Therefore, the purpose of this paper is to propose the reasonable evaluation method of the joint rigidity based on the proceeding studies. This method is the approximate evaluation method of rotational rigidity of joint, and it's case studies of the initial rotational rigidity are exercised. Also, the moments of inertia of the joints for the sectional shapes are evaluated and compared by the experimental results theoretical ones. The results of this paper are summerized as follows; The theoretical approach is needed to analyze the experimental results, the moments of inertia evaluated by introducing the simple assumption show a good agreement with ones obtained from the numerical method. It is regarded that the assumption used in theoretical approach is reasonable. The moments of inertia evaluated geometrically from the cross sections show the values which are higher than about 1.8 times that obtained by the experimental results. The plastic moments calculated by the theoretical approaches are 1.3 times that of yielding moment of experimental results. Eventually, these results should be a useful data to identify the structural behavior of the space frame and evaluate the buckling strength of the members and the systems.