SPECIFICATION'S FOR STEEL HIGHWAY BRIDGES. 
9 
27. Plate gird- 
ers. 
Surfaces of bronze bearing plates intended for sliding 
contact, shall be carefully milled and polish-finished. 
Abutting ends of compression members shall, after. 23. Abutting 
the members have been riveted, be accurately faced to''°^^^^" 
secure an even bearing when assembled in the structure. 
Ends of tension members at splices shall be rough- 
finished to secure close and neat but not contact-fitting 
joints. 
End connection angles of floor beams and stringers 24. End con- 
shall be flush with each other and accurately set as ^q^^^ ^^^ ^^^ ^^ 
position and length of member. In general, end con- 
nection angles shall not be finished unless required by 
the terms of the contract. However, faulty assembling 
and riveting may be cause for requiring them to be 
milled, in which case their thickness shall be reduced 
not to exceed x^ inch, nor shall their- rivet-bearing value 
be reduced below design requirements. 
The several pieces forming one built member shall be^j^^- Buiitmem- 
straight and close-fitting. Such members shall be true 
to detailed dimensions and free from twists, bends, open 
joints or other defects resulting from faulty fabrication 
and workmanship. 
The ends of lacing bars shall be neatly rounded unless 26. Lacing bars 
otherwise indicated. 
Weh plates. — Web plates of girders having no cover 
plates may be detailed with the top edge of the web 
flush with the backs of the flange angles. Any portion 
of the plate projecting beyond the angles shall be chipped 
flush with the backs of the angles. Web plates of girders 
having cover plates may be 3^ inch less in width than the 
distance back-to-back of flange angles. 
When web plates are spliced, not more than % inch 
clearance between ends of plates will be allowed. 
Weh stiffeners. — End stinener angles of girders and 
stiffener angles intended as supports for concentrated 
loads shall be milled or ground to secure a uniform, even 
bearing against the flange angles. Intermediate stiflener 
angles shaU fit suSiciently tight to exclude water after 
being painted. 
Weh splices and fillers. — Web splice plates and fillers 
under stiffeners shall fit within y?, inch at each end. 
Eyebars shall be straight and true to size, and shall be 28. Eyebars. 
free from twists, folds in the neck or head, or any other 
defect affecting their service strength. Heads shall be 
made by upsetting, rolhng or forging. Welds in the 
body portions or in the heads of bars will not be per- 
mitted. The form of the heads may be determined 
by the dies in use at the works where the eyebars are to 
be made, if satisfactory to the engineer. The thickness 
of head and neck shall not overrun more than y^ inch. 
Boring. — Before boring, each eyebar shall be properly 
annealed and carefully straightened. Pinholes shall be 
located on the center line of the bar and in the centers of 
90578°— 24t 2 
