44 



MT! 8 ON PLATE-GIRDER DESIGN 





clement of efficiency for resistance to transverse displace- 

 ment. A common rule is to make the width of the outstand- 

 ing leg (0) equal to the depth of the girder (d) in inche* 

 divided by ao plus J". or expressed as a formula 



,+.." 



30 + ~ ' 



. (ID 



The following is a common method of locating inter- 

 mediate Mitten, 



Intermediate stiffeners should be used at points as 

 re<iuired by (10) or wherever the unsupported depth !>ei\\< < -n 

 flange angles is more than (16^ times the web thirkm >-. 

 Where intermediate stiflfeners are required they should 

 never be further apart in the clear than the clear distance 

 between the flange angles, with a maximum limit of .V. 



Concentrated load stiffeners act to transfer a concen- 

 trated load into the web or to transfer the girder load to 

 a support. The sketch of Fig. 86 will illustrate both cases. 



aft.' 



110000 



-101 



. -,-71 -wo 



FIG. 86. 



The girder here shown being loaded with three con- 

 centrated loads of 180,000, and its own weight of 250 

 Ibe. per linear foot. The lines of maximum web si 



