斜角格子げたの荷重分配性状

概要

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The author already reported on an analysis of a skew plane-framed structure in consideration of the torsional rigidity of its main beams, and of the structure with right grillage system. In this paper, an observation, based on this analysis, is made of the charactristics of the load-distribution in accordance with the variabilities of the shape and the sectional property of the structure ; that is, variation of the skew angle θ, variation of the ratio l/a of the span length to the spacing of the main beams, variation of the ratio λ/a of the J_Q/J of the moment of inertia of the cross beam to that of the main beam. The results are as follows : (1) The structure of any extreme shape is anadvantage in respect of stress when designing a bridge. (2) The value of the bending moment when θ＞60°is approximately the sarne as in the case of a right bridge, but the point of the maximum bending moment shifts considerably from the midspan when θ＜60°. (3) The crossbeams must be arranged each at a proper distance. (4) When the shape is extreme in structure the cross beams must be arranged at the corner. (5) The most economical sectional property is J_Q/J ≒0.2.
北見工業大学の論文