. The railroad and engineering journal . la, being the totallength between the square ends of the braces, where theyrest upon the brace-blocks. The dead load used is taken at 1,500 lbs. per runningfoot for pony trusses. The floor system, shown in Platesloi and I02, is the standard in use upon the Atchison,Topeka & Santa Fe Railroad. There will be given, in fol-lowing chapters, a number of plates containing differenttypes of floor systems, with complete bills 6f material foreach, so that the engineer may use in connection with theplans of the bridge proper any type of floor system hedesires. Up
. The railroad and engineering journal . la, being the totallength between the square ends of the braces, where theyrest upon the brace-blocks. The dead load used is taken at 1,500 lbs. per runningfoot for pony trusses. The floor system, shown in Platesloi and I02, is the standard in use upon the Atchison,Topeka & Santa Fe Railroad. There will be given, in fol-lowing chapters, a number of plates containing differenttypes of floor systems, with complete bills 6f material foreach, so that the engineer may use in connection with theplans of the bridge proper any type of floor system hedesires. Upon the strain diagram will be found the maximumstrains due to the dead and live load, also, ni, s, the mini-mum allowable section according to the above strain speci-fications ; s. It, the section used in dimensioning the mem-bers, the difference being the allowance made for impact,etc. In the short-span bridges a great allowance has beenmade, as will be seen by an examination of the straindiagram. 132 THE RAILROAD AND [March, a c r -© m - + ^-1 + ^- + CS ® 0 O CJ) © - - .F» - -* 1 j; 1 T -r V. 1 • .<s *
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887
