Figure 7-11. Euler buckling loads versus longeron lengths. 0. 35 to 1. 5 m. Also shown in Figure 7-12, by a horizontal dashed line, is the allowable crippling load for this three-longeron triangular beam. The allowable crippling load value was determined by assuming that all three longerons are equally loaded in compression and fail simultaneously. Thus, the crippling load plotted on the chart is the maximum allowable compressive load. Curves in this figure may be interpreted the same as for the longeron curve plot of Figure 7-11. For instance, the maximum practical distance between supports for alm beam would be approximately 43 m. Figure 7-13 is a plot of Euler buckling loads and a crippling load for a large beam truss. Data are shown for beam truss heights ranging up to 20 m. Since the large beam truss carries axial compressive loads through nine V-hat section longerons, the axial crippling load is nine times that of a single longeron. The curve plot is interpreted the same as for Figures 7-11 and 7-12.
RkJQdWJsaXNoZXIy MTU5NjU0Mg==