ARKA OF CROSS-SECTION FOR 1 1 



I 



in \\hi.-h W i- thr ii. ..it.. -Hi of tin- uut.-r forces; 



thr unit Mtrests in the extreme fibrr of th. 

 cross-section under conuidcTati 

 / i- tin- moment of inertia >f thr CltMi ICCtk' 



th< distance from the neutral axis to the 



<B-etion. 



Any i-\i>tinv: >irai^ht : ^ir-l.-r may be examined 



for intni-ity of flexural tnH in a plane normal to the 

 axis by means of tin.- formula. The plate ginler of prac- 



Fio. 



far from thr ideal prUmatic liar of thr 

 Throry o! Fl<\un . Thr :i|.plirat ion of thr preceding for- 

 mula to thr design of pinln> i- .iou>. and while 



itly farilitatr.l l>y thr u><- of tables of - 



for a gr of eases, the labor of it* application 



..l.lnns (f ch-si^n i- not \\arrantr.l. 



Thr almost universal inrthoti of plat--^inlrr flange 

 n will now be developed, with thr aid of tin- following 



.nrlaturr and 1 



