General Specifications for Iron And Steel Railroad Bridges And Viaducts
General Specifications for Iron And Steel Railroad Bridges And Viaducts
Theodore Cooper
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In members subject to tensile strains full allowance shall be made for reduction of section by rivet-holes, screw- threads, etc. ( 60. ) 34. Compression members shall be proportioned by the following allowed unit strains : Medium Steel. For Medium Steel. Chord segments P= 10, 000 45 for live load strains. P=2o, ooo 90 for dead load strains. All posts of i through P== 8, 500 45 for live load strains, bridges. P=i7, ooo 90_for dead load strains. All posts of / deck bridges />= 9, 000 40 for live ...load strains. and trestles. 1 8, 000 80 for dead load strains. 9 End posts are not to be considered chord segments. Lateral struts j and rigid P= 13, 000 60 for wind strains; bracing. for live load strains use two-thirds of the above. ( 27, 29, P=the allowed strain in compression per square inch of cross-section, in pounds. /=the length of compression member, in inches, c. To c. , of connections. r=the least radius of gyration of the section, in inches. No compression member, however, shall have a length exceeding 100 times its least radius of gyration for main members, or 120 times for laterals.
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