General Specifications for Iron And Steel Railroad Bridges And Viaducts

Cover 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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