張弦梁における束材の回転不安定及び面外補剛剛性の定式化

概要

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Beam string system is often used in spatial structures. High strength strings are taken to stiffen the beam through struts so that the beam can be slender. The lateral unstable rotation of struts is possible to occur when the beam deforms under vertical loads such as those caused by snow if struts are pin jointed to the beam. The beam string system will collapse if the unstable rotation happens. In practical design, by using rigid joints in connections between struts and the beam, or by using two struts to get one V-shaped stable strut, the unstable rotation can be prevented. In this paper, struts are stabilized by lateral bracings, which are connected at bottoms of struts and fixed at another ends. Equilibrium equation is formulated for calculating the minimum stiffness of bracings needed for stabilizing struts. The number of struts, the ratio of strut's length to span, and the lateral bending stiffness of the beam are taken as parameters in case studies. In the end, the results obtained from the proposed analytical method are verified by carrying out geometrically nonlinear finite element analysis.
2003-11-30