Essentials in the theory of framed structures . D=+ i = + 1551 I=+ + D= + in8 L=+ + •3 D + I43 7 ?+L = + = + + Pig. Pig. 113. load and impact compressive stresses, and there is no Counters.—The diagonals in two of the panels in must be designed to resist both tensile and compressivestresses. If eye-bars or other flexible members, which are notcapable of taking compressive stress, are used; it will be neces-sary to introduce counters in panels 2-3 and 3-4, as shown bythe dotted lines in Fig. 113. Sec. Ill BRIDGES 167
Essentials in the theory of framed structures . D=+ i = + 1551 I=+ + D= + in8 L=+ + •3 D + I43 7 ?+L = + = + + Pig. Pig. 113. load and impact compressive stresses, and there is no Counters.—The diagonals in two of the panels in must be designed to resist both tensile and compressivestresses. If eye-bars or other flexible members, which are notcapable of taking compressive stress, are used; it will be neces-sary to introduce counters in panels 2-3 and 3-4, as shown bythe dotted lines in Fig. 113. Sec. Ill BRIDGES 167 A counter carries no stress, except when the shear in the panelis of such a nature that the stress in the main diagonal would becompressive if the counter were omitted. The tensile stresscarried by the counter in a parallel chord truss, obviously hasthe same magnitude as the compressive stress in the maindiagonal if no counter were used. Thus in Fig. 113 the maxi-mum stress in UsLi is +, and the maximum stress in Z3Z74is + The maximum compressive stress in UiLi has thesame magnitude as the maximum tensile stress in U3L3, whenno counters are used. When t
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectstructu, bookyear1922
