64 



INFLUENCE DIAGRAMS 



The base diagram indicated by the heavy lines in Fig. 



42a, is the influence diagram for . The ordinates to 



s 



FIG. 42 6. VERTICAL SHEAR 



FIG. 42. 



the curve DGB are obtained by giving k corresponding 

 values in the expression 



_ (fc _ 2k 2 + & 3 )^ - (k 2 - /b 3 ) . 



8 

 Then the shaded area is the influence diagram for . 



