Investigation of Secondary Stresses in Bridge Structures
Investigation of Secondary Stresses in Bridge Structures
Bates, Floyd Elton
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Genert il Case. Case. 'Chord Stress 'Web Stress ' I chord 'I web. 1 Type. 1 ' 10 ' 10 ' 4 ' 1 • Pratt 2 ! ■^^ ' 10 ' 4 ' 2 r If 3 I 10 1 5 • 4 ' 1 r n 4 • 10 ' 5 ' • 4 ' 2 r It 5 ' 10 " ' ' 4 1 ' 1 " It 6 • 10 " ' ' 4 ' ' 2 ' It 7 ' 10 ' ' 10 ' 4 ' 1 ' Warren 8 ' 10 " 10 ' 4 ' 2 ' II 9 ' 10 ' • 5 ' 4 ' 1 ' It 10 ' 10 ' ' 5 ' 4 ' • 2 ' It 11 • 10 ' " 4 ' ' 1 1 It 12 ' ' 10 ' ' 4 ' 2 " - - - _ J 11 13 ' 14 ' ' 10 ' ' 10 ' 10 ' 10 ' 4 ' 4 ' ' 2 " 2 ' Without Ver- ticals. V/ar ren 60° Warren 45 15 ...' ' 10 ' ______ J 10 ' 4 ' 2 ' Warren 45° with verti- cals. Digitized by Google Digitized by Google Digitized by Google UNIVERSITY OP WifiCONfilN. COLLrAr np MPrUANirfi AND ENGINEERING Digitized by Google A comparison of the stresses for Cases I, III and V gives some idea of the distribution of secondary stresses in a bridge. At the center their action is very small and may be neglected while near the abutments the amount is consid- erable. Roughly the secondary stress near the points of support is from two to four times what it is at the center for chord members, and from four to ten times for web mem- bers • Vases VII to XII deal with the Warren type of structure without verticals (see sheet No»2).
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