18 NOTES <>\ PLATE-GIRDER DESIGN 



.>i>tini: inuiiu lit of tin- variuu- portion- and the 



dotted line tin- moments of till' outer fo rcr.-. 



Thr application of formulas (3) an. I 1 \\ill now he 

 |( finding tin- length- of COVer plate- for th.is pur- 



a girder i-'i' l"n^ c, t> c, <-n<l ix-aiin^s, i\o\" 



1 .... 4c. 



deep out to out of Haiip- angles and of tin- following coiii|<- 

 >ition : 



1 preb pUte 60X|"-22.50sq.in. X| 2.81 sq.ins. 



J top an-l-> r, . ii , \ <).(> = 11. 52 +2.81 =14.33 s<j.in>. 

 1 top plate* 14 X) -7.00 + 14.33- =21.33 .^iin> 



1 top plate 1 4 Xi =7.00 +21.33= =28.33 so,. in,. 



2 bottom angles 0x6x19.6 = 11.52-2.00= ( .' "_' K2.81 



= 12.:;:; Bq.ins, 

 1 bottom plan 14 Xi =7.00 -1.00 = 6.00 +9.52 = 



18.33 sq.ins. 

 1 bottom platr 14X1=7.00-1.00 = 6.00+15.52 = 



24.33 sq-ins. 



The girder will first be assumed to act as in a single- 

 track deck railway hrid^c, using formula (3), 

 Maximum hending moment = 1,938,410 ft.lh-. 



/ 193 500 \ 



Maximum end shear l'.i;;.:,no lh>. (,r= ^ =9000). 



0-12.33, 18.33, and 24.33 sq.in. 

 A -4.77, 4.85, and 4.93ft. 



