li.v.v 21 



fore between any two i t is ewk-nual that tin r 



enough i l.p the *tre**o* produced 



1>> the llia\i!lllllll ilHT.-JL-r 111 Iliulliellt Ut\\ee|| t hi- | 



Tin- increment in tin- moment i- .tly vnr 



throughout the girder length. Tin- ^i n< nil equation for 

 moment for a simple gird. --n in Art I b 



.V-tf,jr- ., P 

 Tit. ,1, \f with rr>|M-ri to | 



-v /?| U7J /"*! - 



It i> thmfon >,m that thr jr- iiirn-tiiM* in th- 



U-n.ling moiiu-ii- \\li.n the shear lian the gn 



poesible valur 



The inri, a>e in U-inling moment U-t\\eeii two point.- 



BO close top-tiler that the loail U-tween them may U- 



,. i> the >hear multiplied ly the distance between 



the points; the increase in flange stress b this increase 



in moment divided l>y the depth. 



the maximum -hear at any j>oint on the gir 



A -the efTective depth, i.e.. the depth to C. of 



gravity of flange-, in inches 

 ft -the least value of the rivet to resist i-i- 



liing or shear, and 

 p-the space between two adjacent rivets in inches. 



]' Xl 

 Th- . the maximum im-rea^e in flange stress in a 



space of 1 inch (a) 



1^ 



-stress per inch of prdcr length carried ly 



the ri\ (6) 



