BEAM BRIDGES. 



119 



TABLE XI. 



DEPTH IN INCHES OF I-BEAMS FOR DIFFERENT SPACINGS AND SPANS REQUIRED TO CARRY ZO-TON, 



15-ToN AND IO-TON AUTO TRUCKS AND 30 PER CENT IMPACT. DEAD LOAD 100 LB. 



PER SQ. FT. MINIMUM WEIGHTS OF I-BEAMS ARE USED. 



TABLE XII. 



DEPTH IN INCHES OF I-BEAMS FOR DIFFERENT SPACINGS AND SPANS REQUIRED TO CARRY 20- 

 TON, 15-TON AND 10-TON AUTO TRUCKS AND 30 PER CENT IMPACT. MINIMUM 

 WEIGHTS OF I-BEAMS ARE USED. 





