BEAMS OF CONSTANT CROSS-SECTION 



61 



Simple Beam on Two Supports. For a simple beam rest- 

 ing upon two supports M L and M R are zero, hence 



M s =m s and S a =S. 



FIG. 40. 



The influence diagrams for m s and S are base diagrams 

 constructed according to the general rule. Figs. 40a 

 and 406 show moment influence diagrams. In one diagram 

 CB is drawn horizontal according to rule, while in the 

 other DB is horizontal. Evidently the ordinates are the 

 same in both figures. 



