114 



STEEL HIGHWAY BRIDGES. 



CHAP. III. 



24*1*80* 



LlVELOAD:20-Tonautotrucki-30%impad,orl?5lt>. 



persq. Ft.t30%imp3ct. DEADLOAfrlOOIbptrsq.ft. 



12 Id 16 18 20 22 24 

 Psnel Length in Feet. 



2345 



Spacing inFeet. 



FIG. 9. BENDING MOMENTS IN FLOORBEAMS AND STRINGERS FOR ao-TON AUTO TRUCK. 

 (30 PER CENT IMPACT). CONCRETE FLOOR. 



24"lx80*' 



LiVELoWfrTonautotrvcktXZimpacLorlWIb. 



2 3 4 

 Spacing in feet. 



10 12 14 /6 18 20 22 24 

 Panel Length in Feet. 



FIG. 10. BENDING MOMENTS IN FLOORBEAMS AND STRINGERS FOR IS-TON AUTO TRUCK. 

 (30 PER CENT IMPACT). CONCRETE FLOOR. 



