Suspension Bridges And Cantilevers Their Economic Proportions And Limiting Span
Suspension Bridges And Cantilevers Their Economic Proportions And Limiting Span
D B David Barnard Steinman
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Hence the maximum possible span for a cantilever bridge is 5600 ft. This value may be approached, but never exceeded 162 by increasing the ratio of dead-load to live-load indefinitely. Note that the corresponding maximum span for the suspension bridge is 14, 700 ft. , or about 2. 6 times as great as the above. Maximum Suspended Span. A solu- tion of the empiric formula for the weight of the suspended span, as established in the preceding article, yields r, --. I . . (2) This expression will bec...ome infinite when the denominator reduces to zero, i. E. , when a . 00054 ' or Hence the maximum possible length for the suspended span is 1850 ft. This ^value has a theoretical significance sim- ilar to that of L in the preceding para- . Graph. 163 Maximum Length of Anchor Arm. A solution of the empiric formula of the preceding article for the weight of the anchor arm yields . . . (3) 1 cVn This expression becomes infinite for = 1= JL c . 0190* Hence =2760. max The limiting length of anchor arm is therefore 2760 ft.
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