These values include the force and moment due to the hydrostatic component 

 of the loading. 



Again assuming that the wave action on both sides of the structure is 

 identical, so that the maximum net horizontal force and maximum overturning 

 moment occurs when a clapotis crest is on one side of the structure and a 

 trough is on the other side 



say 



and 



say 



F' = F' - F' = 98.5 - 17.1 = 81.4 kN/m 

 net e t 



F' = 82 kN/m (5,620 lb/ft) 



net 



(T = 6 s) 



kN-tn 

 M- = M' - M' = 149.4 - 11.8 = 137.6 



net a t 



m 



(T = 6 s) 



M' = 138 MtE (31,000^^) 

 net ™ ^^ 



A similar analysis for the 10-second wave gives. 



F' = 85.2 kN/m (5,840 lb/ft) 



net 



W = 139 kN/m (31,250 ^^-^ ) 

 net ^t 



(T = 10 s) 



*************************************** 



e. Wall on Rubble Foundation . Forces acting on a vertical wall built on 

 a rubble foundation are shown in Figure 7-98 and may be computed in a manner 

 similar to computing the forces acting on a low wall if the complements of the 

 force and moment reduction factors are used. As shown in Figure 7-98, the 

 value of b which is used for computing b/y Iq ^y^Q height of the rubble 

 base and not the height of the wall above the foundation. '^^^ equation 

 relating the reduced force F" against the wall on a rubble foundation with 

 the force F which would act against a wall extending the entire depth is 



F" = ( 1 - r 1 F (7-82) 



The equation relating the moments is. 



M" = fl - r ^M (7-83) 



A \ m 



1-\11 



