Essentials in the theory of framed structures . Fig. 205. The stress in UzUs for Case IV, determined by theproportionate method is -208 X 100 •132 Sec. I SWING BRIDGES 317 The stress for Case IV, determined by the exact method, is-134- 198. Moment about Ug.^The influence Unes are shown inFig. 206. Whenever each arm has six or more equal panels, theinfluence line for Case IV shows a reversal of stress in one ormore chord members of the loaded arm adjacent to the centersupport. This phenomenon is explained in connection with. Ui Uz U3 U4 U; Us Ui U8 U9 Uio U,,

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