Essentials in the theory of framed structures . 2 X = = LL X ^^== = I493 UiLi Wheel 4 at UMoment of wheels i to 8 about 8 = 2851Moment of wheels i to 4 about 4 = 4802,851480 X 2 = 960 = ££ ^^= = I343 When the train crosses the span in one direction, it is obviousthat the stress in any web member of the left half is the same asthe stress in the corresponding member of the right half, whenthe train crosses in the opposite direction. Considering one-half of the structure, we shall have the various combinations of i66 THEORY OF FRAMED STRUCTURES Chap. IV Stres
Essentials in the theory of framed structures . 2 X = = LL X ^^== = I493 UiLi Wheel 4 at UMoment of wheels i to 8 about 8 = 2851Moment of wheels i to 4 about 4 = 4802,851480 X 2 = 960 = ££ ^^= = I343 When the train crosses the span in one direction, it is obviousthat the stress in any web member of the left half is the same asthe stress in the corresponding member of the right half, whenthe train crosses in the opposite direction. Considering one-half of the structure, we shall have the various combinations of i66 THEORY OF FRAMED STRUCTURES Chap. IV Stresses, as listed in Fig. 112. When the dead and live loadstresses are opposite in character, only two-thirds of the dead-load stress is considered. Thus in U^Li the total stress is-f when the train crosses from right to left, and — the train crosses from left to right. In UiLi the dead-load tensile stress is greater than the live- — D=-I43 7L = L^ = -2145 1 ~&ea4 . , -7 D=+ i = + 1551 I=+ + D= + in8 L=+ + •3 D + I43 7 ?+L = + = + + Pig. 112.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectstructu, bookyear1922
