120 



MECHANICS 



"SOLUTION. The length of the beam, reduced to feet, is 

 13.2083. The total load W is therefore 85X13.2083 

 = 1,122.7055, say 1,123 Ib. Referring to Case XI, the max- 



W 1123 



imum shear = = - = 561.5 Ib. Likewise, the maximum 

 2 2 



bending moment is 



ft 4 



8 



CONTINUOUS BEAMS 



When a single beam extends over three or mo^re supports 

 it is said to be continuous. The bending moments produced 

 are very different from those in an ordinary beam. For this 

 reason, the treatment of this class of beams must be con- 

 sidered separately. 



BENDING MOMENTS FOR CONTINUOUS BEAMS OVER 



EQUAL SPANS 

 (Coefficients of Wl) 



Num- 

 ber of 

 Spans 



Number of Each Support 



1st 2d 3d 4th 5th 6th 7th 8th 9th 10th 



A 



ittr 



W 



iK 



The first of the tables, on page 119, gives the coefficients 

 for the reactions of the beam at its supports. The v^lue 

 given in the table multiplied by W, which represents the load 

 per span, will give the reaction. By knowing the reactions 



