STEEL FRAMEWORK OF BUILDINGS 11 



shall be stayed by diagonal lattice having tie-plates as near each 

 end as practicable and at intermediate points where the lattice 

 is interrupted. In the main members the tie-plates shall have 

 a length of not less than the width of the main member on the 

 connected side, provided that no tie-plate be less than 10 in. long 

 near the ends of such- members. 



Their minimum thickness shall be one-forty-eighth (fa) of the 

 distance between center lines of the connecting rivets. 



41. Columns. In proportioning the area of columns the 

 effect of bending stresses due to wind or eccentric loading shall 

 be included. 



Columns shall have as few splices as practicable and, where 

 spliced, the splices shall be strong enough to resist the direct 

 as well as the bending stresses. 



42. Lattice Bars. Single lattice bars shall have an inclination 

 of approximately 60 with the axis of the main member and shall 

 have a minimum thickness of one-fortieth (fa) of the distance 

 between the rivets connecting them to the member. 



Single lattice bars may be connected with one rivet, except 

 in flanges more than 5 in. wide, where two rivets shall be 

 used. Lattice angles shall be connected by at least two rivets. 



Double lattice bars shall be used where the distance between 

 rivet lines in the flanges exceeds 15 in. They shall have a mini- 

 mum thickness of one-sixtieth (-fa) of the distance between the 

 rivets connecting them to the member, shall have an inclination 

 of approximately 45, and shall be riveted at their intersection. 



The minimum width of lattice bars shall be: 



For 15-in. channels, or built sections with } 01 . ,_ . 



i } 1\ in. (iHn. rivets) 



angles over 3 in J 



For 12-, 10-, and 9-in. channels, or built sec- 1 



. ,, . 2J in. (J-in. rivets) 



tions with 3-in. angles J 



For 8- and 7-in. channels, or built sections } _ . ,_ . 



.,, 01 . 2 in. (f-m. rivets) 



with 2|-in. angles J , 



For 6-in. channels or less 1} in. (i-in. rivets) 



43. Pins. The minimum diameter of pins shall be eight- 

 tenths .(-&) of the width of the widest eye-bar attached to it. 



Members shall be packed on pins, using filling rings where 

 necessary, in a manner that will prevent any lateral movement. 



